git.monstr.eu Git - linux-2.6-microblaze.git/log

bpf: Introduce BPF nospec instruction for mitigating Spectre v4

In case of JITs, each of the JIT backends compiles the BPF nospec instruction
/either/ to a machine instruction which emits a speculation barrier /or/ to
/no/ machine instruction in case the underlying architecture is not affected
by Speculative Store Bypass or has different mitigations in place already.

This covers both x86 and (implicitly) arm64: In case of x86, we use 'lfence'
instruction for mitigation. In case of arm64, we rely on the firmware mitigation
as controlled via the ssbd kernel parameter. Whenever the mitigation is enabled,
it works for all of the kernel code with no need to provide any additional
instructions here (hence only comment in arm64 JIT). Other archs can follow
as needed. The BPF nospec instruction is specifically targeting Spectre v4
since i) we don't use a serialization barrier for the Spectre v1 case, and
ii) mitigation instructions for v1 and v4 might be different on some archs.

The BPF nospec is required for a future commit, where the BPF verifier does
annotate intermediate BPF programs with speculation barriers.

Co-developed-by: Piotr Krysiuk <piotras@gmail.com>
Co-developed-by: Benedict Schlueter <benedict.schlueter@rub.de>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Piotr Krysiuk <piotras@gmail.com>
Signed-off-by: Benedict Schlueter <benedict.schlueter@rub.de>
Acked-by: Alexei Starovoitov <ast@kernel.org>

Merge branch 'sockmap fixes picked up by stress tests'

John Fastabend says:

====================

Running stress tests with recent patch to remove an extra lock in sockmap
resulted in a couple new issues popping up. It seems only one of them
is actually related to the patch:

799aa7f98d53 ("skmsg: Avoid lock_sock() in sk_psock_backlog()")

The other two issues had existed long before, but I guess the timing
with the serialization we had before was too tight to get any of
our tests or deployments to hit it.

With attached series stress testing sockmap+TCP with workloads that
create lots of short-lived connections no more splats like below were
seen on upstream bpf branch.

[224913.935822] WARNING: CPU: 3 PID: 32100 at net/core/stream.c:208 sk_stream_kill_queues+0x212/0x220
[224913.935841] Modules linked in: fuse overlay bpf_preload x86_pkg_temp_thermal intel_uncore wmi_bmof squashfs sch_fq_codel efivarfs ip_tables x_tables uas xhci_pci ixgbe mdio xfrm_algo xhci_hcd wmi
[224913.935897] CPU: 3 PID: 32100 Comm: fgs-bench Tainted: G          I       5.14.0-rc1alu+ #181
[224913.935908] Hardware name: Dell Inc. Precision 5820 Tower/002KVM, BIOS 1.9.2 01/24/2019
[224913.935914] RIP: 0010:sk_stream_kill_queues+0x212/0x220
[224913.935923] Code: 8b 83 20 02 00 00 85 c0 75 20 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 89 df e8 2b 11 fe ff eb c3 0f 0b e9 7c ff ff ff 0f 0b eb ce <0f> 0b 5b 5d 41 5c 41 5d 41 5e 41 5f c3 90 0f 1f 44 00 00 41 57 41
[224913.935932] RSP: 0018:ffff88816271fd38 EFLAGS: 00010206
[224913.935941] RAX: 0000000000000ae8 RBX: ffff88815acd5240 RCX: dffffc0000000000
[224913.935948] RDX: 0000000000000003 RSI: 0000000000000ae8 RDI: ffff88815acd5460
[224913.935954] RBP: ffff88815acd5460 R08: ffffffff955c0ae8 R09: fffffbfff2e6f543
[224913.935961] R10: ffffffff9737aa17 R11: fffffbfff2e6f542 R12: ffff88815acd5390
[224913.935967] R13: ffff88815acd5480 R14: ffffffff98d0c080 R15: ffffffff96267500
[224913.935974] FS:  00007f86e6bd1700(0000) GS:ffff888451cc0000(0000) knlGS:0000000000000000
[224913.935981] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[224913.935988] CR2: 000000c0008eb000 CR3: 00000001020e0005 CR4: 00000000003706e0
[224913.935994] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[224913.936000] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[224913.936007] Call Trace:
[224913.936016]  inet_csk_destroy_sock+0xba/0x1f0
[224913.936033]  __tcp_close+0x620/0x790
[224913.936047]  tcp_close+0x20/0x80
[224913.936056]  inet_release+0x8f/0xf0
[224913.936070]  __sock_release+0x72/0x120

v3: make sock_drop inline in skmsg.h
v2: init skb to null and fix a space/tab issue. Added Jakub's acks.
====================

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>

bpf, sockmap: Fix memleak on ingress msg enqueue

If backlog handler is running during a tear down operation we may enqueue
data on the ingress msg queue while tear down is trying to free it.

sk_psock_backlog()
   sk_psock_handle_skb()
     skb_psock_skb_ingress()
       sk_psock_skb_ingress_enqueue()
         sk_psock_queue_msg(psock,msg)
                                           spin_lock(ingress_lock)
                                            sk_psock_zap_ingress()
                                             _sk_psock_purge_ingerss_msg()
                                              _sk_psock_purge_ingress_msg()
                                            -- free ingress_msg list --
                                           spin_unlock(ingress_lock)
           spin_lock(ingress_lock)
           list_add_tail(msg,ingress_msg) <- entry on list with no one
                                             left to free it.
           spin_unlock(ingress_lock)

To fix we only enqueue from backlog if the ENABLED bit is set. The tear
down logic clears the bit with ingress_lock set so we wont enqueue the
msg in the last step.

Fixes: 799aa7f98d53 ("skmsg: Avoid lock_sock() in sk_psock_backlog()")
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Jakub Sitnicki <jakub@cloudflare.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20210727160500.1713554-4-john.fastabend@gmail.com

bpf, sockmap: On cleanup we additionally need to remove cached skb

Its possible if a socket is closed and the receive thread is under memory
pressure it may have cached a skb. We need to ensure these skbs are
free'd along with the normal ingress_skb queue.

Before 799aa7f98d53 ("skmsg: Avoid lock_sock() in sk_psock_backlog()") tear
down and backlog processing both had sock_lock for the common case of
socket close or unhash. So it was not possible to have both running in
parrallel so all we would need is the kfree in those kernels.

But, latest kernels include the commit 799aa7f98d5e and this requires a
bit more work. Without the ingress_lock guarding reading/writing the
state->skb case its possible the tear down could run before the state
update causing it to leak memory or worse when the backlog reads the state
it could potentially run interleaved with the tear down and we might end up
free'ing the state->skb from tear down side but already have the reference
from backlog side. To resolve such races we wrap accesses in ingress_lock
on both sides serializing tear down and backlog case. In both cases this
only happens after an EAGAIN error case so having an extra lock in place
is likely fine. The normal path will skip the locks.

Note, we check state->skb before grabbing lock. This works because
we can only enqueue with the mutex we hold already. Avoiding a race
on adding state->skb after the check. And if tear down path is running
that is also fine if the tear down path then removes state->skb we
will simply set skb=NULL and the subsequent goto is skipped. This
slight complication avoids locking in normal case.

With this fix we no longer see this warning splat from tcp side on
socket close when we hit the above case with redirect to ingress self.

[224913.935822] WARNING: CPU: 3 PID: 32100 at net/core/stream.c:208 sk_stream_kill_queues+0x212/0x220
[224913.935841] Modules linked in: fuse overlay bpf_preload x86_pkg_temp_thermal intel_uncore wmi_bmof squashfs sch_fq_codel efivarfs ip_tables x_tables uas xhci_pci ixgbe mdio xfrm_algo xhci_hcd wmi
[224913.935897] CPU: 3 PID: 32100 Comm: fgs-bench Tainted: G          I       5.14.0-rc1alu+ #181
[224913.935908] Hardware name: Dell Inc. Precision 5820 Tower/002KVM, BIOS 1.9.2 01/24/2019
[224913.935914] RIP: 0010:sk_stream_kill_queues+0x212/0x220
[224913.935923] Code: 8b 83 20 02 00 00 85 c0 75 20 5b 5d 41 5c 41 5d 41 5e 41 5f c3 48 89 df e8 2b 11 fe ff eb c3 0f 0b e9 7c ff ff ff 0f 0b eb ce <0f> 0b 5b 5d 41 5c 41 5d 41 5e 41 5f c3 90 0f 1f 44 00 00 41 57 41
[224913.935932] RSP: 0018:ffff88816271fd38 EFLAGS: 00010206
[224913.935941] RAX: 0000000000000ae8 RBX: ffff88815acd5240 RCX: dffffc0000000000
[224913.935948] RDX: 0000000000000003 RSI: 0000000000000ae8 RDI: ffff88815acd5460
[224913.935954] RBP: ffff88815acd5460 R08: ffffffff955c0ae8 R09: fffffbfff2e6f543
[224913.935961] R10: ffffffff9737aa17 R11: fffffbfff2e6f542 R12: ffff88815acd5390
[224913.935967] R13: ffff88815acd5480 R14: ffffffff98d0c080 R15: ffffffff96267500
[224913.935974] FS:  00007f86e6bd1700(0000) GS:ffff888451cc0000(0000) knlGS:0000000000000000
[224913.935981] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[224913.935988] CR2: 000000c0008eb000 CR3: 00000001020e0005 CR4: 00000000003706e0
[224913.935994] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[224913.936000] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[224913.936007] Call Trace:
[224913.936016]  inet_csk_destroy_sock+0xba/0x1f0
[224913.936033]  __tcp_close+0x620/0x790
[224913.936047]  tcp_close+0x20/0x80
[224913.936056]  inet_release+0x8f/0xf0
[224913.936070]  __sock_release+0x72/0x120
[224913.936083]  sock_close+0x14/0x20

Fixes: a136678c0bdbb ("bpf: sk_msg, zap ingress queue on psock down")
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Jakub Sitnicki <jakub@cloudflare.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20210727160500.1713554-3-john.fastabend@gmail.com

bpf, sockmap: Zap ingress queues after stopping strparser

We don't want strparser to run and pass skbs into skmsg handlers when
the psock is null. We just sk_drop them in this case. When removing
a live socket from map it means extra drops that we do not need to
incur. Move the zap below strparser close to avoid this condition.

This way we stop the stream parser first stopping it from processing
packets and then delete the psock.

Fixes: a136678c0bdbb ("bpf: sk_msg, zap ingress queue on psock down")
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Jakub Sitnicki <jakub@cloudflare.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20210727160500.1713554-2-john.fastabend@gmail.com

bpf: Fix OOB read when printing XDP link fdinfo

We got the following UBSAN report on one of our testing machines:

    ================================================================================
    UBSAN: array-index-out-of-bounds in kernel/bpf/syscall.c:2389:24
    index 6 is out of range for type 'char *[6]'
    CPU: 43 PID: 930921 Comm: systemd-coredum Tainted: G           O      5.10.48-cloudflare-kasan-2021.7.0 #1
    Hardware name: <snip>
    Call Trace:
     dump_stack+0x7d/0xa3
     ubsan_epilogue+0x5/0x40
     __ubsan_handle_out_of_bounds.cold+0x43/0x48
     ? seq_printf+0x17d/0x250
     bpf_link_show_fdinfo+0x329/0x380
     ? bpf_map_value_size+0xe0/0xe0
     ? put_files_struct+0x20/0x2d0
     ? __kasan_kmalloc.constprop.0+0xc2/0xd0
     seq_show+0x3f7/0x540
     seq_read_iter+0x3f8/0x1040
     seq_read+0x329/0x500
     ? seq_read_iter+0x1040/0x1040
     ? __fsnotify_parent+0x80/0x820
     ? __fsnotify_update_child_dentry_flags+0x380/0x380
     vfs_read+0x123/0x460
     ksys_read+0xed/0x1c0
     ? __x64_sys_pwrite64+0x1f0/0x1f0
     do_syscall_64+0x33/0x40
     entry_SYSCALL_64_after_hwframe+0x44/0xa9
    <snip>
    ================================================================================
    ================================================================================
    UBSAN: object-size-mismatch in kernel/bpf/syscall.c:2384:2

From the report, we can infer that some array access in bpf_link_show_fdinfo at index 6
is out of bounds. The obvious candidate is bpf_link_type_strs[BPF_LINK_TYPE_XDP] with
BPF_LINK_TYPE_XDP == 6. It turns out that BPF_LINK_TYPE_XDP is missing from bpf_types.h
and therefore doesn't have an entry in bpf_link_type_strs:

    pos: 0
    flags: 02000000
    mnt_id: 13
    link_type: (null)
    link_id: 4
    prog_tag: bcf7977d3b93787c
    prog_id: 4
    ifindex: 1

Fixes: aa8d3a716b59 ("bpf, xdp: Add bpf_link-based XDP attachment API")
Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210719085134.43325-2-lmb@cloudflare.com

bpf, selftests: Add test cases for pointer alu from multiple paths

Add several test cases for checking update_alu_sanitation_state() under
multiple paths:

  # ./test_verifier
  [...]
  #1061/u map access: known scalar += value_ptr unknown vs const OK
  #1061/p map access: known scalar += value_ptr unknown vs const OK
  #1062/u map access: known scalar += value_ptr const vs unknown OK
  #1062/p map access: known scalar += value_ptr const vs unknown OK
  #1063/u map access: known scalar += value_ptr const vs const (ne) OK
  #1063/p map access: known scalar += value_ptr const vs const (ne) OK
  #1064/u map access: known scalar += value_ptr const vs const (eq) OK
  #1064/p map access: known scalar += value_ptr const vs const (eq) OK
  #1065/u map access: known scalar += value_ptr unknown vs unknown (eq) OK
  #1065/p map access: known scalar += value_ptr unknown vs unknown (eq) OK
  #1066/u map access: known scalar += value_ptr unknown vs unknown (lt) OK
  #1066/p map access: known scalar += value_ptr unknown vs unknown (lt) OK
  #1067/u map access: known scalar += value_ptr unknown vs unknown (gt) OK
  #1067/p map access: known scalar += value_ptr unknown vs unknown (gt) OK
  [...]
  Summary: 1762 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>

bpf: Fix pointer arithmetic mask tightening under state pruning

In 7fedb63a8307 ("bpf: Tighten speculative pointer arithmetic mask") we
narrowed the offset mask for unprivileged pointer arithmetic in order to
mitigate a corner case where in the speculative domain it is possible to
advance, for example, the map value pointer by up to value_size-1 out-of-
bounds in order to leak kernel memory via side-channel to user space.

The verifier's state pruning for scalars leaves one corner case open
where in the first verification path R_x holds an unknown scalar with an
aux->alu_limit of e.g. 7, and in a second verification path that same
register R_x, here denoted as R_x', holds an unknown scalar which has
tighter bounds and would thus satisfy range_within(R_x, R_x') as well as
tnum_in(R_x, R_x') for state pruning, yielding an aux->alu_limit of 3:
Given the second path fits the register constraints for pruning, the final
generated mask from aux->alu_limit will remain at 7. While technically
not wrong for the non-speculative domain, it would however be possible
to craft similar cases where the mask would be too wide as in 7fedb63a8307.

One way to fix it is to detect the presence of unknown scalar map pointer
arithmetic and force a deeper search on unknown scalars to ensure that
we do not run into a masking mismatch.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>

bpf: Remove superfluous aux sanitation on subprog rejection

Follow-up to fe9a5ca7e370 ("bpf: Do not mark insn as seen under speculative
path verification"). The sanitize_insn_aux_data() helper does not serve a
particular purpose in today's code. The original intention for the helper
was that if function-by-function verification fails, a given program would
be cleared from temporary insn_aux_data[], and then its verification would
be re-attempted in the context of the main program a second time.

However, a failure in do_check_subprogs() will skip do_check_main() and
propagate the error to the user instead, thus such situation can never occur.
Given its interaction is not compatible to the Spectre v1 mitigation (due to
comparing aux->seen with env->pass_cnt), just remove sanitize_insn_aux_data()
to avoid future bugs in this area.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>

Merge git://git./pub/scm/linux/kernel/git/bpf/bpf

Andrii Nakryiko says:

====================
pull-request: bpf 2021-07-15

The following pull-request contains BPF updates for your *net* tree.

We've added 9 non-merge commits during the last 5 day(s) which contain
a total of 9 files changed, 37 insertions(+), 15 deletions(-).

The main changes are:

1) Fix NULL pointer dereference in BPF_TEST_RUN for BPF_XDP_DEVMAP and
   BPF_XDP_CPUMAP programs, from Xuan Zhuo.

2) Fix use-after-free of net_device in XDP bpf_link, from Xuan Zhuo.

3) Follow-up fix to subprog poke descriptor use-after-free problem, from
   Daniel Borkmann and John Fastabend.

4) Fix out-of-range array access in s390 BPF JIT backend, from Colin Ian King.

5) Fix memory leak in BPF sockmap, from John Fastabend.

6) Fix for sockmap to prevent proc stats reporting bug, from John Fastabend
   and Jakub Sitnicki.

7) Fix NULL pointer dereference in bpftool, from Tobias Klauser.

8) AF_XDP documentation fixes, from Baruch Siach.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

usb: hso: fix error handling code of hso_create_net_device

The current error handling code of hso_create_net_device is
hso_free_net_device, no matter which errors lead to. For example,
WARNING in hso_free_net_device [1].

Fix this by refactoring the error handling code of
hso_create_net_device by handling different errors by different code.

[1] https://syzkaller.appspot.com/bug?id=66eff8d49af1b28370ad342787413e35bbe76efe

Reported-by: syzbot+44d53c7255bb1aea22d2@syzkaller.appspotmail.com
Fixes: 5fcfb6d0bfcd ("hso: fix bailout in error case of probe")
Signed-off-by: Dongliang Mu <mudongliangabcd@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

qed: fix possible unpaired spin_{un}lock_bh in _qed_mcp_cmd_and_union()

Liajian reported a bug_on hit on a ThunderX2 arm64 server with FastLinQ
QL41000 ethernet controller:
BUG: scheduling while atomic: kworker/0:4/531/0x00000200
  [qed_probe:488()]hw prepare failed
  kernel BUG at mm/vmalloc.c:2355!
  Internal error: Oops - BUG: 0 [#1] SMP
  CPU: 0 PID: 531 Comm: kworker/0:4 Tainted: G W 5.4.0-77-generic #86-Ubuntu
  pstate: 00400009 (nzcv daif +PAN -UAO)
Call trace:
  vunmap+0x4c/0x50
  iounmap+0x48/0x58
  qed_free_pci+0x60/0x80 [qed]
  qed_probe+0x35c/0x688 [qed]
  __qede_probe+0x88/0x5c8 [qede]
  qede_probe+0x60/0xe0 [qede]
  local_pci_probe+0x48/0xa0
  work_for_cpu_fn+0x24/0x38
  process_one_work+0x1d0/0x468
  worker_thread+0x238/0x4e0
  kthread+0xf0/0x118
  ret_from_fork+0x10/0x18

In this case, qed_hw_prepare() returns error due to hw/fw error, but in
theory work queue should be in process context instead of interrupt.

The root cause might be the unpaired spin_{un}lock_bh() in
_qed_mcp_cmd_and_union(), which causes botton half is disabled incorrectly.

Reported-by: Lijian Zhang <Lijian.Zhang@arm.com>
Signed-off-by: Jia He <justin.he@arm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net: fix uninit-value in caif_seqpkt_sendmsg

When nr_segs equal to zero in iovec_from_user, the object
msg->msg_iter.iov is uninit stack memory in caif_seqpkt_sendmsg
which is defined in ___sys_sendmsg. So we cann't just judge
msg->msg_iter.iov->base directlly. We can use nr_segs to judge
msg in caif_seqpkt_sendmsg whether has data buffers.

=====================================================
BUG: KMSAN: uninit-value in caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1c9/0x220 lib/dump_stack.c:118
kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118
__msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
caif_seqpkt_sendmsg+0x693/0xf60 net/caif/caif_socket.c:542
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg net/socket.c:672 [inline]
____sys_sendmsg+0x12b6/0x1350 net/socket.c:2343
___sys_sendmsg net/socket.c:2397 [inline]
__sys_sendmmsg+0x808/0xc90 net/socket.c:2480
__compat_sys_sendmmsg net/compat.c:656 [inline]

Reported-by: syzbot+09a5d591c1f98cf5efcb@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?id=1ace85e8fc9b0d5a45c08c2656c3e91762daa9b8
Fixes: bece7b2398d0 ("caif: Rewritten socket implementation")
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

bpftool: Check malloc return value in mount_bpffs_for_pin

Fix and add a missing NULL check for the prior malloc() call.

Fixes: 49a086c201a9 ("bpftool: implement prog load command")
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Quentin Monnet <quentin@isovalent.com>
Acked-by: Roman Gushchin <guro@fb.com>
Link: https://lore.kernel.org/bpf/20210715110609.29364-1-tklauser@distanz.ch

bpf, sockmap, udp: sk_prot needs inuse_idx set for proc stats

The proc socket stats use sk_prot->inuse_idx value to record inuse sock
stats. We currently do not set this correctly from sockmap side. The
result is reading sock stats '/proc/net/sockstat' gives incorrect values.
The socket counter is incremented correctly, but because we don't set the
counter correctly when we replace sk_prot we may omit the decrement.

To get the correct inuse_idx value move the core_initcall that initializes
the UDP proto handlers to late_initcall. This way it is initialized after
UDP has the chance to assign the inuse_idx value from the register protocol
handler.

Fixes: edc6741cc660 ("bpf: Add sockmap hooks for UDP sockets")
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Cong Wang <cong.wang@bytedance.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20210714154750.528206-1-jakub@cloudflare.com

bpf, sockmap, tcp: sk_prot needs inuse_idx set for proc stats

The proc socket stats use sk_prot->inuse_idx value to record inuse sock
stats. We currently do not set this correctly from sockmap side. The
result is reading sock stats '/proc/net/sockstat' gives incorrect values.
The socket counter is incremented correctly, but because we don't set the
counter correctly when we replace sk_prot we may omit the decrement.

To get the correct inuse_idx value move the core_initcall that initializes
the TCP proto handlers to late_initcall. This way it is initialized after
TCP has the chance to assign the inuse_idx value from the register protocol
handler.

Fixes: 604326b41a6fb ("bpf, sockmap: convert to generic sk_msg interface")
Suggested-by: Jakub Sitnicki <jakub@cloudflare.com>
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Cong Wang <cong.wang@bytedance.com>
Link: https://lore.kernel.org/bpf/20210712195546.423990-3-john.fastabend@gmail.com

bpf, sockmap: Fix potential memory leak on unlikely error case

If skb_linearize is needed and fails we could leak a msg on the error
handling. To fix ensure we kfree the msg block before returning error.
Found during code review.

Fixes: 4363023d2668e ("bpf, sockmap: Avoid failures from skb_to_sgvec when skb has frag_list")
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Cong Wang <cong.wang@bytedance.com>
Link: https://lore.kernel.org/bpf/20210712195546.423990-2-john.fastabend@gmail.com

s390/bpf: Perform r1 range checking before accessing jit->seen_reg[r1]

Currently array jit->seen_reg[r1] is being accessed before the range
checking of index r1. The range changing on r1 should be performed
first since it will avoid any potential out-of-range accesses on the
array seen_reg[] and also it is more optimal to perform checks on r1
before fetching data from the array. Fix this by swapping the order
of the checks before the array access.

Fixes: 054623105728 ("s390/bpf: Add s390x eBPF JIT compiler backend")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Ilya Leoshkevich <iii@linux.ibm.com>
Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
Link: https://lore.kernel.org/bpf/20210715125712.24690-1-colin.king@canonical.com

net_sched: introduce tracepoint trace_qdisc_enqueue()

Tracepoint trace_qdisc_enqueue() is introduced to trace skb at
the entrance of TC layer on TX side. This is similar to
trace_qdisc_dequeue():

1. For both we only trace successful cases. The failure cases
   can be traced via trace_kfree_skb().

2. They are called at entrance or exit of TC layer, not for each
   ->enqueue() or ->dequeue(). This is intentional, because
   we want to make trace_qdisc_enqueue() symmetric to
   trace_qdisc_dequeue(), which is easier to use.

The return value of qdisc_enqueue() is not interesting here,
we have Qdisc's drop packets in ->dequeue(), it is impossible to
trace them even if we have the return value, the only way to trace
them is tracing kfree_skb().

We only add information we need to trace ring buffer. If any other
information is needed, it is easy to extend it without breaking ABI,
see commit 3dd344ea84e1 ("net: tracepoint: exposing sk_family in all
tcp:tracepoints").

Reviewed-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: Qitao Xu <qitao.xu@bytedance.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net_sched: use %px to print skb address in trace_qdisc_dequeue()

Print format of skbaddr is changed to %px from %p, because we want
to use skb address as a quick way to identify a packet.

Note, trace ring buffer is only accessible to privileged users,
it is safe to use a real kernel address here.

Reviewed-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: Qitao Xu <qitao.xu@bytedance.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net: use %px to print skb address in trace_netif_receive_skb

The print format of skb adress in tracepoint class net_dev_template
is changed to %px from %p, because we want to use skb address
as a quick way to identify a packet.

Note, trace ring buffer is only accessible to privileged users,
it is safe to use a real kernel address here.

Reviewed-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: Qitao Xu <qitao.xu@bytedance.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

liquidio: Fix unintentional sign extension issue on left shift of u16

Shifting the u16 integer oct->pcie_port by CN23XX_PKT_INPUT_CTL_MAC_NUM_POS
(29) bits will be promoted to a 32 bit signed int and then sign-extended
to a u64. In the cases where oct->pcie_port where bit 2 is set (e.g. 3..7)
the shifted value will be sign extended and the top 32 bits of the result
will be set.

Fix this by casting the u16 values to a u64 before the 29 bit left shift.

Addresses-Coverity: ("Unintended sign extension")

Fixes: 3451b97cce2d ("liquidio: CN23XX register setup")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net: dsa: mv88e6xxx: NET_DSA_MV88E6XXX_PTP should depend on NET_DSA_MV88E6XXX

Making global2 support mandatory removed the Kconfig symbol
NET_DSA_MV88E6XXX_GLOBAL2. This symbol also served as an intermediate
symbol to make NET_DSA_MV88E6XXX_PTP depend on NET_DSA_MV88E6XXX. With
the symbol removed, the user is always asked about PTP support for
Marvell 88E6xxx switches, even if the latter support is not enabled.

Fix this by reinstating the dependency.

Fixes: 63368a7416df144b ("net: dsa: mv88e6xxx: Make global2 support mandatory")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Merge branch 'r8152-pm-fixxes'

Takashi Iwai says:

====================
r8152: Fix a couple of PM problems

it seems that r8152 driver suffers from the deadlock at both runtime
and system PM.  Formerly, it was seen more often at hibernation
resume, but now it's triggered more frequently, as reported in SUSE
Bugzilla:
  https://bugzilla.suse.com/show_bug.cgi?id=1186194

While debugging the problem, I stumbled on a few obvious bugs and here
is the results with two patches for addressing the resume problem.

***

However, the story doesn't end here, unfortunately, and those patches
don't seem sufficing.  The rest major problem is that the driver calls
napi_disable() and napi_enable() in the PM suspend callbacks.  This
makes the system stalling at (runtime-)suspend.  If we drop
napi_disable() and napi_enable() calls in the PM suspend callbacks, it
starts working (that was the result in Bugzilla comment 13):
  https://bugzilla.suse.com/show_bug.cgi?id=1186194#c13

So, my patches aren't enough and we still need to investigate
further.  It'd be appreciated if anyone can give a fix or a hint for
more debugging.  The usage of napi_disable() at PM callbacks is unique
in this driver and looks rather suspicious to me; but I'm no expert in
this area so I might be wrong...
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

r8152: Fix a deadlock by doubly PM resume

r8152 driver sets up the MAC address at reset-resume, while
rtl8152_set_mac_address() has the temporary autopm get/put. This may
lead to a deadlock as the PM lock has been already taken for the
execution of the runtime PM callback.

This patch adds the workaround to avoid the superfluous autpm when
called from rtl8152_reset_resume().

Link: https://bugzilla.suse.com/show_bug.cgi?id=1186194
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

r8152: Fix potential PM refcount imbalance

rtl8152_close() takes the refcount via usb_autopm_get_interface() but
it doesn't release when RTL8152_UNPLUG test hits. This may lead to
the imbalance of PM refcount. This patch addresses it.

Link: https://bugzilla.suse.com/show_bug.cgi?id=1186194
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

Merge tag 'net-5.14-rc2' of git://git./linux/kernel/git/netdev/net

Pull networking fixes from Jakub Kicinski.
"Including fixes from bpf and netfilter.

  Current release - regressions:

   - sock: fix parameter order in sock_setsockopt()

  Current release - new code bugs:

   - netfilter: nft_last:
       - fix incorrect arithmetic when restoring last used
       - honor NFTA_LAST_SET on restoration

  Previous releases - regressions:

   - udp: properly flush normal packet at GRO time

   - sfc: ensure correct number of XDP queues; don't allow enabling the
     feature if there isn't sufficient resources to Tx from any CPU

   - dsa: sja1105: fix address learning getting disabled on the CPU port

   - mptcp: addresses a rmem accounting issue that could keep packets in
     subflow receive buffers longer than necessary, delaying MPTCP-level
     ACKs

   - ip_tunnel: fix mtu calculation for ETHER tunnel devices

   - do not reuse skbs allocated from skbuff_fclone_cache in the napi
     skb cache, we'd try to return them to the wrong slab cache

   - tcp: consistently disable header prediction for mptcp

  Previous releases - always broken:

   - bpf: fix subprog poke descriptor tracking use-after-free

   - ipv6:
       - allocate enough headroom in ip6_finish_output2() in case
         iptables TEE is used
       - tcp: drop silly ICMPv6 packet too big messages to avoid
         expensive and pointless lookups (which may serve as a DDOS
         vector)
       - make sure fwmark is copied in SYNACK packets
       - fix 'disable_policy' for forwarded packets (align with IPv4)

   - netfilter: conntrack:
       - do not renew entry stuck in tcp SYN_SENT state
       - do not mark RST in the reply direction coming after SYN packet
         for an out-of-sync entry

   - mptcp: cleanly handle error conditions with MP_JOIN and syncookies

   - mptcp: fix double free when rejecting a join due to port mismatch

   - validate lwtstate->data before returning from skb_tunnel_info()

   - tcp: call sk_wmem_schedule before sk_mem_charge in zerocopy path

   - mt76: mt7921: continue to probe driver when fw already downloaded

   - bonding: fix multiple issues with offloading IPsec to (thru?) bond

   - stmmac: ptp: fix issues around Qbv support and setting time back

   - bcmgenet: always clear wake-up based on energy detection

  Misc:

   - sctp: move 198 addresses from unusable to private scope

   - ptp: support virtual clocks and timestamping

   - openvswitch: optimize operation for key comparison"

* tag 'net-5.14-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (158 commits)
  net: dsa: properly check for the bridge_leave methods in dsa_switch_bridge_leave()
  sfc: add logs explaining XDP_TX/REDIRECT is not available
  sfc: ensure correct number of XDP queues
  sfc: fix lack of XDP TX queues - error XDP TX failed (-22)
  net: fddi: fix UAF in fza_probe
  net: dsa: sja1105: fix address learning getting disabled on the CPU port
  net: ocelot: fix switchdev objects synced for wrong netdev with LAG offload
  net: Use nlmsg_unicast() instead of netlink_unicast()
  octeontx2-pf: Fix uninitialized boolean variable pps
  ipv6: allocate enough headroom in ip6_finish_output2()
  net: hdlc: rename 'mod_init' & 'mod_exit' functions to be module-specific
  net: bridge: multicast: fix MRD advertisement router port marking race
  net: bridge: multicast: fix PIM hello router port marking race
  net: phy: marvell10g: fix differentiation of 88X3310 from 88X3340
  dsa: fix for_each_child.cocci warnings
  virtio_net: check virtqueue_add_sgs() return value
  mptcp: properly account bulk freed memory
  selftests: mptcp: fix case multiple subflows limited by server
  mptcp: avoid processing packet if a subflow reset
  mptcp: fix syncookie process if mptcp can not_accept new subflow
  ...

fs: add vfs_parse_fs_param_source() helper

Add a simple helper that filesystems can use in their parameter parser
to parse the "source" parameter. A few places open-coded this function
and that already caused a bug in the cgroup v1 parser that we fixed.
Let's make it harder to get this wrong by introducing a helper which
performs all necessary checks.

Link: https://syzkaller.appspot.com/bug?id=6312526aba5beae046fdae8f00399f87aab48b12
Cc: Christoph Hellwig <hch@lst.de>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

cgroup: verify that source is a string

The following sequence can be used to trigger a UAF:

    int fscontext_fd = fsopen("cgroup");
    int fd_null = open("/dev/null, O_RDONLY);
    int fsconfig(fscontext_fd, FSCONFIG_SET_FD, "source", fd_null);
    close_range(3, ~0U, 0);

The cgroup v1 specific fs parser expects a string for the "source"
parameter.  However, it is perfectly legitimate to e.g.  specify a file
descriptor for the "source" parameter.  The fs parser doesn't know what
a filesystem allows there.  So it's a bug to assume that "source" is
always of type fs_value_is_string when it can reasonably also be
fs_value_is_file.

This assumption in the cgroup code causes a UAF because struct
fs_parameter uses a union for the actual value.  Access to that union is
guarded by the param->type member.  Since the cgroup paramter parser
didn't check param->type but unconditionally moved param->string into
fc->source a close on the fscontext_fd would trigger a UAF during
put_fs_context() which frees fc->source thereby freeing the file stashed
in param->file causing a UAF during a close of the fd_null.

Fix this by verifying that param->type is actually a string and report
an error if not.

In follow up patches I'll add a new generic helper that can be used here
and by other filesystems instead of this error-prone copy-pasta fix.
But fixing it in here first makes backporting a it to stable a lot
easier.

Fixes: 8d2451f4994f ("cgroup1: switch to option-by-option parsing")
Reported-by: syzbot+283ce5a46486d6acdbaf@syzkaller.appspotmail.com
Cc: Christoph Hellwig <hch@lst.de>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: <stable@kernel.org>
Cc: syzkaller-bugs <syzkaller-bugs@googlegroups.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

net: dsa: properly check for the bridge_leave methods in dsa_switch_bridge_leave()

This was not caught because there is no switch driver which implements
the .port_bridge_join but not .port_bridge_leave method, but it should
nonetheless be fixed, as in certain conditions (driver development) it
might lead to NULL pointer dereference.

Fixes: f66a6a69f97a ("net: dsa: permit cross-chip bridging between all trees in the system")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Merge tag 'vboxsf-v5.14-1' of git://git./linux/kernel/git/hansg/linux

Pull vboxsf fixes from Hans de Goede:
"This adds support for the atomic_open directory-inode op to vboxsf.

  Note this is not just an enhancement this also fixes an actual issue
  which users are hitting, see the commit message of the "boxsf: Add
  support for the atomic_open directory-inode" patch"

* tag 'vboxsf-v5.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/hansg/linux:
  vboxsf: Add support for the atomic_open directory-inode op
  vboxsf: Add vboxsf_[create|release]_sf_handle() helpers
  vboxsf: Make vboxsf_dir_create() return the handle for the created file
  vboxsf: Honor excl flag to the dir-inode create op

Merge tag 'for-5.14-rc1-tag' of git://git./linux/kernel/git/kdave/linux

Pull btrfs zoned mode fixes from David Sterba:

- fix deadlock when allocating system chunk

- fix wrong mutex unlock on an error path

- fix extent map splitting for append operation

- update and fix message reporting unusable chunk space

- don't block when background zone reclaim runs with balance in
   parallel

* tag 'for-5.14-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: zoned: fix wrong mutex unlock on failure to allocate log root tree
  btrfs: don't block if we can't acquire the reclaim lock
  btrfs: properly split extent_map for REQ_OP_ZONE_APPEND
  btrfs: rework chunk allocation to avoid exhaustion of the system chunk array
  btrfs: fix deadlock with concurrent chunk allocations involving system chunks
  btrfs: zoned: print unusable percentage when reclaiming block groups
  btrfs: zoned: fix types for u64 division in btrfs_reclaim_bgs_work

Merge branch 'sfc-tx-queues'

Íñigo Huguet says:

====================
sfc: Fix lack of XDP TX queues

A change introduced in commit e26ca4b53582 ("sfc: reduce the number of
requested xdp ev queues") created a bug in XDP_TX and XDP_REDIRECT
because it unintentionally reduced the number of XDP TX queues, letting
not enough queues to have one per CPU, which leaded to errors if XDP
TX/REDIRECT was done from a high numbered CPU.

This patchs make the following changes:
- Fix the bug mentioned above
- Revert commit 99ba0ea616aa ("sfc: adjust efx->xdp_tx_queue_count with
  the real number of initialized queues") which intended to fix a related
  problem, created by mentioned bug, but it's no longer necessary
- Add a new error log message if there are not enough resources to make
  XDP_TX/REDIRECT work

V1 -> V2: keep the calculation of how many tx queues can handle a single
event queue, but apply the "max. tx queues per channel" upper limit.
V2 -> V3: WARN_ON if the number of initialized XDP TXQs differs from the
expected.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

sfc: add logs explaining XDP_TX/REDIRECT is not available

If it's not possible to allocate enough channels for XDP, XDP_TX and
XDP_REDIRECT don't work. However, only a message saying that not enough
channels were available was shown, but not saying what are the
consequences in that case. The user didn't know if he/she can use XDP
or not, if the performance is reduced, or what.

Signed-off-by: Íñigo Huguet <ihuguet@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

sfc: ensure correct number of XDP queues

Commit 99ba0ea616aa ("sfc: adjust efx->xdp_tx_queue_count with the real
number of initialized queues") intended to fix a problem caused by a
round up when calculating the number of XDP channels and queues.
However, this was not the real problem. The real problem was that the
number of XDP TX queues had been reduced to half in
commit e26ca4b53582 ("sfc: reduce the number of requested xdp ev queues"),
but the variable xdp_tx_queue_count had remained the same.

Once the correct number of XDP TX queues is created again in the
previous patch of this series, this also can be reverted since the error
doesn't actually exist.

Only in the case that there is a bug in the code we can have different
values in xdp_queue_number and efx->xdp_tx_queue_count. Because of this,
and per Edward Cree's suggestion, I add instead a WARN_ON to catch if it
happens again in the future.

Note that the number of allocated queues can be higher than the number
of used ones due to the round up, as explained in the existing comment
in the code. That's why we also have to stop increasing xdp_queue_number
beyond efx->xdp_tx_queue_count.

Signed-off-by: Íñigo Huguet <ihuguet@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

sfc: fix lack of XDP TX queues - error XDP TX failed (-22)

Fixes: e26ca4b53582 sfc: reduce the number of requested xdp ev queues

The buggy commit intended to allocate less channels for XDP in order to
be more unlikely to reach the limit of 32 channels of the driver.

The idea was to use each IRQ/eventqeue for more XDP TX queues than
before, calculating which is the maximum number of TX queues that one
event queue can handle. For example, in EF10 each event queue could
handle up to 8 queues, better than the 4 they were handling before the
change. This way, it would have to allocate half of channels than before
for XDP TX.

The problem is that the TX queues are also contained inside the channel
structs, and there are only 4 queues per channel. Reducing the number of
channels means also reducing the number of queues, resulting in not
having the desired number of 1 queue per CPU.

This leads to getting errors on XDP_TX and XDP_REDIRECT if they're
executed from a high numbered CPU, because there only exist queues for
the low half of CPUs, actually. If XDP_TX/REDIRECT is executed in a low
numbered CPU, the error doesn't happen. This is the error in the logs
(repeated many times, even rate limited):
sfc 0000:5e:00.0 ens3f0np0: XDP TX failed (-22)

This errors happens in function efx_xdp_tx_buffers, where it expects to
have a dedicated XDP TX queue per CPU.

Reverting the change makes again more likely to reach the limit of 32
channels in machines with many CPUs. If this happen, no XDP_TX/REDIRECT
will be possible at all, and we will have this log error messages:

At interface probe:
sfc 0000:5e:00.0: Insufficient resources for 12 XDP event queues (24 other channels, max 32)

At every subsequent XDP_TX/REDIRECT failure, rate limited:
sfc 0000:5e:00.0 ens3f0np0: XDP TX failed (-22)

However, without reverting the change, it makes the user to think that
everything is OK at probe time, but later it fails in an unpredictable
way, depending on the CPU that handles the packet.

It is better to restore the predictable behaviour. If the user sees the
error message at probe time, he/she can try to configure the best way it
fits his/her needs. At least, he/she will have 2 options:
- Accept that XDP_TX/REDIRECT is not available (he/she may not need it)
- Load sfc module with modparam 'rss_cpus' with a lower number, thus
creating less normal RX queues/channels, letting more free resources
for XDP, with some performance penalty.

Anyway, let the calculation of maximum TX queues that can be handled by
a single event queue, and use it only if it's less than the number of TX
queues per channel. This doesn't happen in practice, but could happen if
some constant values are tweaked in the future, such us
EFX_MAX_TXQ_PER_CHANNEL, EFX_MAX_EVQ_SIZE or EFX_MAX_DMAQ_SIZE.

Related mailing list thread:
https://lore.kernel.org/bpf/20201215104327.2be76156@carbon/

Signed-off-by: Íñigo Huguet <ihuguet@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net: fddi: fix UAF in fza_probe

fp is netdev private data and it cannot be
used after free_netdev() call. Using fp after free_netdev()
can cause UAF bug. Fix it by moving free_netdev() after error message.

Fixes: 61414f5ec983 ("FDDI: defza: Add support for DEC FDDIcontroller 700
TURBOchannel adapter")
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net: dsa: sja1105: fix address learning getting disabled on the CPU port

In May 2019 when commit 640f763f98c2 ("net: dsa: sja1105: Add support
for Spanning Tree Protocol") was introduced, the comment that "STP does
not get called for the CPU port" was true. This changed after commit
0394a63acfe2 ("net: dsa: enable and disable all ports") in August 2019
and went largely unnoticed, because the sja1105_bridge_stp_state_set()
method did nothing different compared to the static setup done by
sja1105_init_mac_settings().

With the ability to turn address learning off introduced by the blamed
commit, there is a new priv->learn_ena port mask in the driver. When
sja1105_bridge_stp_state_set() gets called and we are in
BR_STATE_LEARNING or later, address learning is enabled or not depending
on priv->learn_ena & BIT(port).

So what happens is that priv->learn_ena is not being set from anywhere
for the CPU port, and the static configuration done by
sja1105_init_mac_settings() is being overwritten.

To solve this, acknowledge that the static configuration of STP state is
no longer necessary because the STP state is being set by the DSA core
now, but what is necessary is to set priv->learn_ena for the CPU port.

Fixes: 4d9423549501 ("net: dsa: sja1105: offload bridge port flags to device")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net: ocelot: fix switchdev objects synced for wrong netdev with LAG offload

The point with a *dev and a *brport_dev is that when we have a LAG net
device that is a bridge port, *dev is an ocelot net device and
*brport_dev is the bonding/team net device. The ocelot net device
beneath the LAG does not exist from the bridge's perspective, so we need
to sync the switchdev objects belonging to the brport_dev and not to the
dev.

Fixes: e4bd44e89dcf ("net: ocelot: replay switchdev events when joining bridge")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net: Use nlmsg_unicast() instead of netlink_unicast()

It has 'if (err >0 )' statement in nlmsg_unicast(), so use nlmsg_unicast()
instead of netlink_unicast(), this looks more concise.

v2: remove the change in netfilter.

Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

xdp, net: Fix use-after-free in bpf_xdp_link_release

The problem occurs between dev_get_by_index() and dev_xdp_attach_link().
At this point, dev_xdp_uninstall() is called. Then xdp link will not be
detached automatically when dev is released. But link->dev already
points to dev, when xdp link is released, dev will still be accessed,
but dev has been released.

dev_get_by_index()        |
link->dev = dev           |
                          |      rtnl_lock()
                          |      unregister_netdevice_many()
                          |          dev_xdp_uninstall()
                          |      rtnl_unlock()
rtnl_lock();              |
dev_xdp_attach_link()     |
rtnl_unlock();            |
                          |      netdev_run_todo() // dev released
bpf_xdp_link_release()    |
    /* access dev.        |
       use-after-free */  |

[   45.966867] BUG: KASAN: use-after-free in bpf_xdp_link_release+0x3b8/0x3d0
[   45.967619] Read of size 8 at addr ffff00000f9980c8 by task a.out/732
[   45.968297]
[   45.968502] CPU: 1 PID: 732 Comm: a.out Not tainted 5.13.0+ #22
[   45.969222] Hardware name: linux,dummy-virt (DT)
[   45.969795] Call trace:
[   45.970106]  dump_backtrace+0x0/0x4c8
[   45.970564]  show_stack+0x30/0x40
[   45.970981]  dump_stack_lvl+0x120/0x18c
[   45.971470]  print_address_description.constprop.0+0x74/0x30c
[   45.972182]  kasan_report+0x1e8/0x200
[   45.972659]  __asan_report_load8_noabort+0x2c/0x50
[   45.973273]  bpf_xdp_link_release+0x3b8/0x3d0
[   45.973834]  bpf_link_free+0xd0/0x188
[   45.974315]  bpf_link_put+0x1d0/0x218
[   45.974790]  bpf_link_release+0x3c/0x58
[   45.975291]  __fput+0x20c/0x7e8
[   45.975706]  ____fput+0x24/0x30
[   45.976117]  task_work_run+0x104/0x258
[   45.976609]  do_notify_resume+0x894/0xaf8
[   45.977121]  work_pending+0xc/0x328
[   45.977575]
[   45.977775] The buggy address belongs to the page:
[   45.978369] page:fffffc00003e6600 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4f998
[   45.979522] flags: 0x7fffe0000000000(node=0|zone=0|lastcpupid=0x3ffff)
[   45.980349] raw: 07fffe0000000000 fffffc00003e6708 ffff0000dac3c010 0000000000000000
[   45.981309] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[   45.982259] page dumped because: kasan: bad access detected
[   45.982948]
[   45.983153] Memory state around the buggy address:
[   45.983753]  ffff00000f997f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   45.984645]  ffff00000f998000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   45.985533] >ffff00000f998080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   45.986419]                                               ^
[   45.987112]  ffff00000f998100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   45.988006]  ffff00000f998180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
[   45.988895] ==================================================================
[   45.989773] Disabling lock debugging due to kernel taint
[   45.990552] Kernel panic - not syncing: panic_on_warn set ...
[   45.991166] CPU: 1 PID: 732 Comm: a.out Tainted: G    B             5.13.0+ #22
[   45.991929] Hardware name: linux,dummy-virt (DT)
[   45.992448] Call trace:
[   45.992753]  dump_backtrace+0x0/0x4c8
[   45.993208]  show_stack+0x30/0x40
[   45.993627]  dump_stack_lvl+0x120/0x18c
[   45.994113]  dump_stack+0x1c/0x34
[   45.994530]  panic+0x3a4/0x7d8
[   45.994930]  end_report+0x194/0x198
[   45.995380]  kasan_report+0x134/0x200
[   45.995850]  __asan_report_load8_noabort+0x2c/0x50
[   45.996453]  bpf_xdp_link_release+0x3b8/0x3d0
[   45.997007]  bpf_link_free+0xd0/0x188
[   45.997474]  bpf_link_put+0x1d0/0x218
[   45.997942]  bpf_link_release+0x3c/0x58
[   45.998429]  __fput+0x20c/0x7e8
[   45.998833]  ____fput+0x24/0x30
[   45.999247]  task_work_run+0x104/0x258
[   45.999731]  do_notify_resume+0x894/0xaf8
[   46.000236]  work_pending+0xc/0x328
[   46.000697] SMP: stopping secondary CPUs
[   46.001226] Dumping ftrace buffer:
[   46.001663]    (ftrace buffer empty)
[   46.002110] Kernel Offset: disabled
[   46.002545] CPU features: 0x00000001,23202c00
[   46.003080] Memory Limit: none

Fixes: aa8d3a716b59db6c ("bpf, xdp: Add bpf_link-based XDP attachment API")
Reported-by: Abaci <abaci@linux.alibaba.com>
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Reviewed-by: Dust Li <dust.li@linux.alibaba.com>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210710031635.41649-1-xuanzhuo@linux.alibaba.com

bpf: Fix tail_call_reachable rejection for interpreter when jit failed

During testing of f263a81451c1 ("bpf: Track subprog poke descriptors correctly
and fix use-after-free") under various failure conditions, for example, when
jit_subprogs() fails and tries to clean up the program to be run under the
interpreter, we ran into the following freeze:

  [...]
  #127/8 tailcall_bpf2bpf_3:FAIL
  [...]
  [   92.041251] BUG: KASAN: slab-out-of-bounds in ___bpf_prog_run+0x1b9d/0x2e20
  [   92.042408] Read of size 8 at addr ffff88800da67f68 by task test_progs/682
  [   92.043707]
  [   92.044030] CPU: 1 PID: 682 Comm: test_progs Tainted: G   O   5.13.0-53301-ge6c08cb33a30-dirty #87
  [   92.045542] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1 04/01/2014
  [   92.046785] Call Trace:
  [   92.047171]  ? __bpf_prog_run_args64+0xc0/0xc0
  [   92.047773]  ? __bpf_prog_run_args32+0x8b/0xb0
  [   92.048389]  ? __bpf_prog_run_args64+0xc0/0xc0
  [   92.049019]  ? ktime_get+0x117/0x130
  [...] // few hundred [similar] lines more
  [   92.659025]  ? ktime_get+0x117/0x130
  [   92.659845]  ? __bpf_prog_run_args64+0xc0/0xc0
  [   92.660738]  ? __bpf_prog_run_args32+0x8b/0xb0
  [   92.661528]  ? __bpf_prog_run_args64+0xc0/0xc0
  [   92.662378]  ? print_usage_bug+0x50/0x50
  [   92.663221]  ? print_usage_bug+0x50/0x50
  [   92.664077]  ? bpf_ksym_find+0x9c/0xe0
  [   92.664887]  ? ktime_get+0x117/0x130
  [   92.665624]  ? kernel_text_address+0xf5/0x100
  [   92.666529]  ? __kernel_text_address+0xe/0x30
  [   92.667725]  ? unwind_get_return_address+0x2f/0x50
  [   92.668854]  ? ___bpf_prog_run+0x15d4/0x2e20
  [   92.670185]  ? ktime_get+0x117/0x130
  [   92.671130]  ? __bpf_prog_run_args64+0xc0/0xc0
  [   92.672020]  ? __bpf_prog_run_args32+0x8b/0xb0
  [   92.672860]  ? __bpf_prog_run_args64+0xc0/0xc0
  [   92.675159]  ? ktime_get+0x117/0x130
  [   92.677074]  ? lock_is_held_type+0xd5/0x130
  [   92.678662]  ? ___bpf_prog_run+0x15d4/0x2e20
  [   92.680046]  ? ktime_get+0x117/0x130
  [   92.681285]  ? __bpf_prog_run32+0x6b/0x90
  [   92.682601]  ? __bpf_prog_run64+0x90/0x90
  [   92.683636]  ? lock_downgrade+0x370/0x370
  [   92.684647]  ? mark_held_locks+0x44/0x90
  [   92.685652]  ? ktime_get+0x117/0x130
  [   92.686752]  ? lockdep_hardirqs_on+0x79/0x100
  [   92.688004]  ? ktime_get+0x117/0x130
  [   92.688573]  ? __cant_migrate+0x2b/0x80
  [   92.689192]  ? bpf_test_run+0x2f4/0x510
  [   92.689869]  ? bpf_test_timer_continue+0x1c0/0x1c0
  [   92.690856]  ? rcu_read_lock_bh_held+0x90/0x90
  [   92.691506]  ? __kasan_slab_alloc+0x61/0x80
  [   92.692128]  ? eth_type_trans+0x128/0x240
  [   92.692737]  ? __build_skb+0x46/0x50
  [   92.693252]  ? bpf_prog_test_run_skb+0x65e/0xc50
  [   92.693954]  ? bpf_prog_test_run_raw_tp+0x2d0/0x2d0
  [   92.694639]  ? __fget_light+0xa1/0x100
  [   92.695162]  ? bpf_prog_inc+0x23/0x30
  [   92.695685]  ? __sys_bpf+0xb40/0x2c80
  [   92.696324]  ? bpf_link_get_from_fd+0x90/0x90
  [   92.697150]  ? mark_held_locks+0x24/0x90
  [   92.698007]  ? lockdep_hardirqs_on_prepare+0x124/0x220
  [   92.699045]  ? finish_task_switch+0xe6/0x370
  [   92.700072]  ? lockdep_hardirqs_on+0x79/0x100
  [   92.701233]  ? finish_task_switch+0x11d/0x370
  [   92.702264]  ? __switch_to+0x2c0/0x740
  [   92.703148]  ? mark_held_locks+0x24/0x90
  [   92.704155]  ? __x64_sys_bpf+0x45/0x50
  [   92.705146]  ? do_syscall_64+0x35/0x80
  [   92.706953]  ? entry_SYSCALL_64_after_hwframe+0x44/0xae
  [...]

Turns out that the program rejection from e411901c0b77 ("bpf: allow for tailcalls
in BPF subprograms for x64 JIT") is buggy since env->prog->aux->tail_call_reachable
is never true. Commit ebf7d1f508a7 ("bpf, x64: rework pro/epilogue and tailcall
handling in JIT") added a tracker into check_max_stack_depth() which propagates
the tail_call_reachable condition throughout the subprograms. This info is then
assigned to the subprogram's func[i]->aux->tail_call_reachable. However, in the
case of the rejection check upon JIT failure, env->prog->aux->tail_call_reachable
is used. func[0]->aux->tail_call_reachable which represents the main program's
information did not propagate this to the outer env->prog->aux, though. Add this
propagation into check_max_stack_depth() where it needs to belong so that the
check can be done reliably.

Fixes: ebf7d1f508a7 ("bpf, x64: rework pro/epilogue and tailcall handling in JIT")
Fixes: e411901c0b77 ("bpf: allow for tailcalls in BPF subprograms for x64 JIT")
Co-developed-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Link: https://lore.kernel.org/bpf/618c34e3163ad1a36b1e82377576a6081e182f25.1626123173.git.daniel@iogearbox.net

sd: don't mess with SD_MINORS for CONFIG_DEBUG_BLOCK_EXT_DEVT

No need to give up the original sd minor even with this option,
and if we did we'd also need to fix the number of minors for
this configuration to actually work.

Fixes: 7c3f828b522b0 ("block: refactor device number setup in __device_add_disk")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm: Make copy_huge_page() always available

Rewrite copy_huge_page() and move it into mm/util.c so it's always
available. Fixes an exposure of uninitialised memory on configurations
with HUGETLB and UFFD enabled and MIGRATION disabled.

Fixes: 8cc5fcbb5be8 ("mm, hugetlb: fix racy resv_huge_pages underflow on UFFDIO_COPY")
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/rmap: fix munlocking Anon THP with mlocked ptes

Many thanks to Kirill for reminding that PageDoubleMap cannot be relied on
to warn of pte mappings in the Anon THP case; and a scan of subpages does
not seem appropriate here. Note how follow_trans_huge_pmd() does not even
mark an Anon THP as mlocked when compound_mapcount != 1: multiple mlocking
of Anon THP is avoided, so simply return from page_mlock() in this case.

Link: https://lore.kernel.org/lkml/cfa154c-d595-406-eb7d-eb9df730f944@google.com/
Fixes: d9770fcc1c0c ("mm/rmap: fix old bug: munlocking THP missed other mlocks")
Reported-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

octeontx2-pf: Fix uninitialized boolean variable pps

In the case where act->id is FLOW_ACTION_POLICE and also
act->police.rate_bytes_ps > 0 or act->police.rate_pkt_ps is not > 0
the boolean variable pps contains an uninitialized value when
function otx2_tc_act_set_police is called. Fix this by initializing
pps to false.

Addresses-Coverity: ("Uninitialized scalar variable)"
Fixes: 68fbff68dbea ("octeontx2-pf: Add police action for TC flower")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

ipv6: allocate enough headroom in ip6_finish_output2()

When TEE target mirrors traffic to another interface, sk_buff may
not have enough headroom to be processed correctly.
ip_finish_output2() detect this situation for ipv4 and allocates
new skb with enogh headroom. However ipv6 lacks this logic in
ip_finish_output2 and it leads to skb_under_panic:

skbuff: skb_under_panic: text:ffffffffc0866ad4 len:96 put:24
head:ffff97be85e31800 data:ffff97be85e317f8 tail:0x58 end:0xc0 dev:gre0
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:110!
invalid opcode: 0000 [#1] SMP PTI
CPU: 2 PID: 393 Comm: kworker/2:2 Tainted: G           OE     5.13.0 #13
Hardware name: Virtuozzo KVM, BIOS 1.11.0-2.vz7.4 04/01/2014
Workqueue: ipv6_addrconf addrconf_dad_work
RIP: 0010:skb_panic+0x48/0x4a
Call Trace:
  skb_push.cold.111+0x10/0x10
  ipgre_header+0x24/0xf0 [ip_gre]
  neigh_connected_output+0xae/0xf0
  ip6_finish_output2+0x1a8/0x5a0
  ip6_output+0x5c/0x110
  nf_dup_ipv6+0x158/0x1000 [nf_dup_ipv6]
  tee_tg6+0x2e/0x40 [xt_TEE]
  ip6t_do_table+0x294/0x470 [ip6_tables]
  nf_hook_slow+0x44/0xc0
  nf_hook.constprop.34+0x72/0xe0
  ndisc_send_skb+0x20d/0x2e0
  ndisc_send_ns+0xd1/0x210
  addrconf_dad_work+0x3c8/0x540
  process_one_work+0x1d1/0x370
  worker_thread+0x30/0x390
  kthread+0x116/0x130
  ret_from_fork+0x22/0x30

Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net: hdlc: rename 'mod_init' & 'mod_exit' functions to be module-specific

Rename module_init & module_exit functions that are named
"mod_init" and "mod_exit" so that they are unique in both the
System.map file and in initcall_debug output instead of showing
up as almost anonymous "mod_init".

This is helpful for debugging and in determining how long certain
module_init calls take to execute.

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Krzysztof Halasa <khc@pm.waw.pl>
Cc: netdev@vger.kernel.org
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Martin Schiller <ms@dev.tdt.de>
Cc: linux-x25@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>

bpf, test: fix NULL pointer dereference on invalid expected_attach_type

These two types of XDP progs (BPF_XDP_DEVMAP, BPF_XDP_CPUMAP) will not be
executed directly in the driver, therefore we should also not directly
run them from here. To run in these two situations, there must be further
preparations done, otherwise these may cause a kernel panic.

For more details, see also dev_xdp_attach().

  [   46.982479] BUG: kernel NULL pointer dereference, address: 0000000000000000
  [   46.984295] #PF: supervisor read access in kernel mode
  [   46.985777] #PF: error_code(0x0000) - not-present page
  [   46.987227] PGD 800000010dca4067 P4D 800000010dca4067 PUD 10dca6067 PMD 0
  [   46.989201] Oops: 0000 [#1] SMP PTI
  [   46.990304] CPU: 7 PID: 562 Comm: a.out Not tainted 5.13.0+ #44
  [   46.992001] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/24
  [   46.995113] RIP: 0010:___bpf_prog_run+0x17b/0x1710
  [   46.996586] Code: 49 03 14 cc e8 76 f6 fe ff e9 ad fe ff ff 0f b6 43 01 48 0f bf 4b 02 48 83 c3 08 89 c2 83 e0 0f c0 ea 04 02
  [   47.001562] RSP: 0018:ffffc900005afc58 EFLAGS: 00010246
  [   47.003115] RAX: 0000000000000000 RBX: ffffc9000023f068 RCX: 0000000000000000
  [   47.005163] RDX: 0000000000000000 RSI: 0000000000000079 RDI: ffffc900005afc98
  [   47.007135] RBP: 0000000000000000 R08: ffffc9000023f048 R09: c0000000ffffdfff
  [   47.009171] R10: 0000000000000001 R11: ffffc900005afb40 R12: ffffc900005afc98
  [   47.011172] R13: 0000000000000001 R14: 0000000000000001 R15: ffffffff825258a8
  [   47.013244] FS:  00007f04a5207580(0000) GS:ffff88842fdc0000(0000) knlGS:0000000000000000
  [   47.015705] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [   47.017475] CR2: 0000000000000000 CR3: 0000000100182005 CR4: 0000000000770ee0
  [   47.019558] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  [   47.021595] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  [   47.023574] PKRU: 55555554
  [   47.024571] Call Trace:
  [   47.025424]  __bpf_prog_run32+0x32/0x50
  [   47.026296]  ? printk+0x53/0x6a
  [   47.027066]  ? ktime_get+0x39/0x90
  [   47.027895]  bpf_test_run.cold.28+0x23/0x123
  [   47.028866]  ? printk+0x53/0x6a
  [   47.029630]  bpf_prog_test_run_xdp+0x149/0x1d0
  [   47.030649]  __sys_bpf+0x1305/0x23d0
  [   47.031482]  __x64_sys_bpf+0x17/0x20
  [   47.032316]  do_syscall_64+0x3a/0x80
  [   47.033165]  entry_SYSCALL_64_after_hwframe+0x44/0xae
  [   47.034254] RIP: 0033:0x7f04a51364dd
  [   47.035133] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 48
  [   47.038768] RSP: 002b:00007fff8f9fc518 EFLAGS: 00000213 ORIG_RAX: 0000000000000141
  [   47.040344] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f04a51364dd
  [   47.041749] RDX: 0000000000000048 RSI: 0000000020002a80 RDI: 000000000000000a
  [   47.043171] RBP: 00007fff8f9fc530 R08: 0000000002049300 R09: 0000000020000100
  [   47.044626] R10: 0000000000000004 R11: 0000000000000213 R12: 0000000000401070
  [   47.046088] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
  [   47.047579] Modules linked in:
  [   47.048318] CR2: 0000000000000000
  [   47.049120] ---[ end trace 7ad34443d5be719a ]---
  [   47.050273] RIP: 0010:___bpf_prog_run+0x17b/0x1710
  [   47.051343] Code: 49 03 14 cc e8 76 f6 fe ff e9 ad fe ff ff 0f b6 43 01 48 0f bf 4b 02 48 83 c3 08 89 c2 83 e0 0f c0 ea 04 02
  [   47.054943] RSP: 0018:ffffc900005afc58 EFLAGS: 00010246
  [   47.056068] RAX: 0000000000000000 RBX: ffffc9000023f068 RCX: 0000000000000000
  [   47.057522] RDX: 0000000000000000 RSI: 0000000000000079 RDI: ffffc900005afc98
  [   47.058961] RBP: 0000000000000000 R08: ffffc9000023f048 R09: c0000000ffffdfff
  [   47.060390] R10: 0000000000000001 R11: ffffc900005afb40 R12: ffffc900005afc98
  [   47.061803] R13: 0000000000000001 R14: 0000000000000001 R15: ffffffff825258a8
  [   47.063249] FS:  00007f04a5207580(0000) GS:ffff88842fdc0000(0000) knlGS:0000000000000000
  [   47.065070] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [   47.066307] CR2: 0000000000000000 CR3: 0000000100182005 CR4: 0000000000770ee0
  [   47.067747] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  [   47.069217] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  [   47.070652] PKRU: 55555554
  [   47.071318] Kernel panic - not syncing: Fatal exception
  [   47.072854] Kernel Offset: disabled
  [   47.073683] ---[ end Kernel panic - not syncing: Fatal exception ]---

Fixes: 9216477449f3 ("bpf: cpumap: Add the possibility to attach an eBPF program to cpumap")
Fixes: fbee97feed9b ("bpf: Add support to attach bpf program to a devmap entry")
Reported-by: Abaci <abaci@linux.alibaba.com>
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: Dust Li <dust.li@linux.alibaba.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: David Ahern <dsahern@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20210708080409.73525-1-xuanzhuo@linux.alibaba.com

doc, af_xdp: Fix bind flags option typo

Fix XDP_ZERO_COPY flag typo since it is actually named XDP_ZEROCOPY
instead as per if_xdp.h uapi header.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/1656fdf94704e9e735df0f8b97667d8f26dd098b.1625550240.git.baruch@tkos.co.il

Linux 5.14-rc1

mm/rmap: try_to_migrate() skip zone_device !device_private

I know nothing about zone_device pages and !device_private pages; but if
try_to_migrate_one() will do nothing for them, then it's better that
try_to_migrate() filter them first, than trawl through all their vmas.

Signed-off-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Reviewed-by: Alistair Popple <apopple@nvidia.com>
Link: https://lore.kernel.org/lkml/1241d356-8ec9-f47b-a5ec-9b2bf66d242@google.com/
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/rmap: fix new bug: premature return from page_mlock_one()

In the unlikely race case that page_mlock_one() finds VM_LOCKED has been
cleared by the time it got page table lock, page_vma_mapped_walk_done()
must be called before returning, either explicitly, or by a final call
to page_vma_mapped_walk() - otherwise the page table remains locked.

Fixes: cd62734ca60d ("mm/rmap: split try_to_munlock from try_to_unmap")
Signed-off-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Alistair Popple <apopple@nvidia.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Reported-by: kernel test robot <oliver.sang@intel.com>
Link: https://lore.kernel.org/lkml/20210711151446.GB4070@xsang-OptiPlex-9020/
Link: https://lore.kernel.org/lkml/f71f8523-cba7-3342-40a7-114abc5d1f51@google.com/
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/rmap: fix old bug: munlocking THP missed other mlocks

The kernel recovers in due course from missing Mlocked pages: but there
was no point in calling page_mlock() (formerly known as
try_to_munlock()) on a THP, because nothing got done even when it was
found to be mapped in another VM_LOCKED vma.

It's true that we need to be careful: Mlocked accounting of pte-mapped
THPs is too difficult (so consistently avoided); but Mlocked accounting
of only-pmd-mapped THPs is supposed to work, even when multiple mappings
are mlocked and munlocked or munmapped. Refine the tests.

There is already a VM_BUG_ON_PAGE(PageDoubleMap) in page_mlock(), so
page_mlock_one() does not even have to worry about that complication.

(I said the kernel recovers: but would page reclaim be likely to split
THP before rediscovering that it's VM_LOCKED? I've not followed that up)

Fixes: 9a73f61bdb8a ("thp, mlock: do not mlock PTE-mapped file huge pages")
Signed-off-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Link: https://lore.kernel.org/lkml/cfa154c-d595-406-eb7d-eb9df730f944@google.com/
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Yang Shi <shy828301@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/rmap: fix comments left over from recent changes

Parallel developments in mm/rmap.c have left behind some out-of-date
comments: try_to_migrate_one() also accepts TTU_SYNC (already commented
in try_to_migrate() itself), and try_to_migrate() returns nothing at
all.

TTU_SPLIT_FREEZE has just been deleted, so reword the comment about it
in mm/huge_memory.c; and TTU_IGNORE_ACCESS was removed in 5.11, so
delete the "recently referenced" comment from try_to_unmap_one() (once
upon a time the comment was near the removed codeblock, but they drifted
apart).

Signed-off-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Reviewed-by: Alistair Popple <apopple@nvidia.com>
Link: https://lore.kernel.org/lkml/563ce5b2-7a44-5b4d-1dfd-59a0e65932a9@google.com/
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Merge branch 'bridge-mc-fixes'

Nikolay Aleksandrov says:

====================
net: bridge: multicast: fix automatic router port marking races

While working on per-vlan multicast snooping I found two race conditions
when multicast snooping is enabled. They're identical and happen when
the router port list is modified without the multicast lock. One requires
a PIM hello message to be received on a port and the other an MRD
advertisement. To fix them we just need to take the multicast_lock when
adding the ports to the router port list (marking them as router ports).
Tested on an affected setup by generating the required packets while
modifying the port list in parallel.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

net: bridge: multicast: fix MRD advertisement router port marking race

When an MRD advertisement is received on a bridge port with multicast
snooping enabled, we mark it as a router port automatically, that
includes adding that port to the router port list. The multicast lock
protects that list, but it is not acquired in the MRD advertisement case
leading to a race condition, we need to take it to fix the race.

Cc: stable@vger.kernel.org
Cc: linus.luessing@c0d3.blue
Fixes: 4b3087c7e37f ("bridge: Snoop Multicast Router Advertisements")
Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net: bridge: multicast: fix PIM hello router port marking race

When a PIM hello packet is received on a bridge port with multicast
snooping enabled, we mark it as a router port automatically, that
includes adding that port the router port list. The multicast lock
protects that list, but it is not acquired in the PIM message case
leading to a race condition, we need to take it to fix the race.

Cc: stable@vger.kernel.org
Fixes: 91b02d3d133b ("bridge: mcast: add router port on PIM hello message")
Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Merge tag 'irq-urgent-2021-07-11' of git://git./linux/kernel/git/tip/tip

Pull irq fixes from Ingo Molnar:
"Two fixes:

   - Fix a MIPS IRQ handling RCU bug

   - Remove a DocBook annotation for a parameter that doesn't exist
     anymore"

* tag 'irq-urgent-2021-07-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/mips: Fix RCU violation when using irqdomain lookup on interrupt entry
  genirq/irqdesc: Drop excess kernel-doc entry @lookup

Merge tag 'sched-urgent-2021-07-11' of git://git./linux/kernel/git/tip/tip

Pull scheduler fixes from Ingo Molnar:
"Three fixes:

   - Fix load tracking bug/inconsistency

   - Fix a sporadic CFS bandwidth constraints enforcement bug

   - Fix a uclamp utilization tracking bug for newly woken tasks"

* tag 'sched-urgent-2021-07-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/uclamp: Ignore max aggregation if rq is idle
  sched/fair: Fix CFS bandwidth hrtimer expiry type
  sched/fair: Sync load_sum with load_avg after dequeue

Merge tag 'perf-urgent-2021-07-11' of git://git./linux/kernel/git/tip/tip

Pull perf fixes from Ingo Molnar:
"A fix and a hardware-enablement addition:

   - Robustify uncore_snbep's skx_iio_set_mapping()'s error cleanup

   - Add cstate event support for Intel ICELAKE_X and ICELAKE_D"

* tag 'perf-urgent-2021-07-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/x86/intel/uncore: Clean up error handling path of iio mapping
  perf/x86/cstate: Add ICELAKE_X and ICELAKE_D support

Merge tag 'locking-urgent-2021-07-11' of git://git./linux/kernel/git/tip/tip

Pull locking fixes from Ingo Molnar:

- Fix a Sparc crash

- Fix a number of objtool warnings

- Fix /proc/lockdep output on certain configs

- Restore a kprobes fail-safe

* tag 'locking-urgent-2021-07-11' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  locking/atomic: sparc: Fix arch_cmpxchg64_local()
  kprobe/static_call: Restore missing static_call_text_reserved()
  static_call: Fix static_call_text_reserved() vs __init
  jump_label: Fix jump_label_text_reserved() vs __init
  locking/lockdep: Fix meaningless /proc/lockdep output of lock classes on !CONFIG_PROVE_LOCKING

Merge tag 'scsi-misc' of git://git./linux/kernel/git/jejb/scsi

Pull more SCSI updates from James Bottomley:
"This is a set of minor fixes and clean ups in the core and various
  drivers.

  The only core change in behaviour is the I/O retry for spinup notify,
  but that shouldn't impact anything other than the failing case"

* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (23 commits)
  scsi: virtio_scsi: Add validation for residual bytes from response
  scsi: ipr: System crashes when seeing type 20 error
  scsi: core: Retry I/O for Notify (Enable Spinup) Required error
  scsi: mpi3mr: Fix warnings reported by smatch
  scsi: qedf: Add check to synchronize abort and flush
  scsi: MAINTAINERS: Add mpi3mr driver maintainers
  scsi: libfc: Fix array index out of bound exception
  scsi: mvsas: Use DEVICE_ATTR_RO()/RW() macro
  scsi: megaraid_mbox: Use DEVICE_ATTR_ADMIN_RO() macro
  scsi: qedf: Use DEVICE_ATTR_RO() macro
  scsi: qedi: Use DEVICE_ATTR_RO() macro
  scsi: message: mptfc: Switch from pci_ to dma_ API
  scsi: be2iscsi: Fix some missing space in some messages
  scsi: be2iscsi: Fix an error handling path in beiscsi_dev_probe()
  scsi: ufs: Fix build warning without CONFIG_PM
  scsi: bnx2fc: Remove meaningless bnx2fc_abts_cleanup() return value assignment
  scsi: qla2xxx: Add heartbeat check
  scsi: virtio_scsi: Do not overwrite SCSI status
  scsi: libsas: Add LUN number check in .slave_alloc callback
  scsi: core: Inline scsi_mq_alloc_queue()
  ...

Merge tag 'perf-tools-for-v5.14-2021-07-10' of git://git./linux/kernel/git/acme/linux

Pull more perf tool updates from Arnaldo Carvalho de Melo:
"New features:

   - Enable use of BPF counters with 'perf stat --for-each-cgroup',
     using per-CPU 'cgroup-switch' events with an attached BPF program
     that does aggregation per-cgroup in the kernel instead of using
     per-cgroup perf events.

   - Add Topdown metrics L2 events as default events in 'perf stat' for
     systems having those events.

  Hardware tracing:

   - Add a config for max loops without consuming a packet in the Intel
     PT packet decoder, set via 'perf config intel-pt.max-loops=N'

  Hardware enablement:

   - Disable misleading NMI watchdog message in 'perf stat' on hybrid
     systems such as Intel Alder Lake.

   - Add a dummy event on hybrid systems to collect metadata records.

   - Add 24x7 nest metric events for the Power10 platform.

  Fixes:

   - Fix event parsing for PMUs starting with the same prefix.

   - Fix the 'perf trace' 'trace' alias installation dir.

   - Fix buffer size to report iregs in perf script python scripts,
     supporting the extended registers in PowerPC.

   - Fix overflow in elf_sec__is_text().

   - Fix 's' on source line when disasm is empty in the annotation TUI,
     accessible via 'perf annotate', 'perf report' and 'perf top'.

   - Plug leaks in scandir() returned dirent entries in 'perf test' when
     sorting the shell tests.

   - Fix --task and --stat with pipe input in 'perf report'.

   - Fix 'perf probe' use of debuginfo files by build id.

   - If a DSO has both dynsym and symtab ELF sections, read from both
     when loading the symbol table, fixing a problem processing Fedora
     32 glibc DSOs.

  Libraries:

   - Add grouping of events to libperf, from code in tools/perf,
     allowing libperf users to use that mode.

  Misc:

   - Filter plt stubs from the 'perf probe --functions' output.

   - Update UAPI header copies for asound, DRM, mman-common.h and the
     ones affected by the quotactl_fd syscall"

* tag 'perf-tools-for-v5.14-2021-07-10' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux: (29 commits)
  perf test: Add free() calls for scandir() returned dirent entries
  libperf: Add tests for perf_evlist__set_leader()
  libperf: Remove BUG_ON() from library code in get_group_fd()
  libperf: Add group support to perf_evsel__open()
  perf tools: Fix pattern matching for same substring in different PMU type
  perf record: Add a dummy event on hybrid systems to collect metadata records
  perf stat: Add Topdown metrics L2 events as default events
  libperf: Adopt evlist__set_leader() from tools/perf as perf_evlist__set_leader()
  libperf: Move 'nr_groups' from tools/perf to evlist::nr_groups
  libperf: Move 'leader' from tools/perf to perf_evsel::leader
  libperf: Move 'idx' from tools/perf to perf_evsel::idx
  libperf: Change tests to single static and shared binaries
  perf intel-pt: Add a config for max loops without consuming a packet
  perf stat: Disable the NMI watchdog message on hybrid
  perf vendor events power10: Adds 24x7 nest metric events for power10 platform
  perf script python: Fix buffer size to report iregs in perf script
  perf trace: Fix the perf trace link location
  perf top: Fix overflow in elf_sec__is_text()
  perf annotate: Fix 's' on source line when disasm is empty
  perf probe: Do not show @plt function by default
  ...

net: phy: marvell10g: fix differentiation of 88X3310 from 88X3340

It seems that we cannot differentiate 88X3310 from 88X3340 by simply
looking at bit 3 of revision ID. This only works on revisions A0 and A1.
On revision B0, this bit is always 1.

Instead use the 3.d00d register for differentiation, since this register
contains information about number of ports on the device.

Fixes: 9885d016ffa9 ("net: phy: marvell10g: add separate structure for 88X3340")
Signed-off-by: Marek Behún <kabel@kernel.org>
Reported-by: Matteo Croce <mcroce@linux.microsoft.com>
Tested-by: Matteo Croce <mcroce@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

dsa: fix for_each_child.cocci warnings

For_each_available_child_of_node should have of_node_put() before
return around line 423.

Generated by: scripts/coccinelle/iterators/for_each_child.cocci

CC: Alexander Lobakin <alobakin@pm.me>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: kernel test robot <lkp@intel.com>
Signed-off-by: Julia Lawall <julia.lawall@inria.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>

Merge tag 'rtc-5.14' of git://git./linux/kernel/git/abelloni/linux

Pull RTC updates from Alexandre Belloni:
"Mostly documentation/comment changes and non urgent fixes.

   - add or fix SPDX identifiers

   - NXP pcf*: fix datasheet URLs

   - imxdi: add wakeup support

   - pcf2127: handle timestamp interrupts, this fixes a possible
     interrupt storm

   - bd70528: Drop BD70528 support"

* tag 'rtc-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (33 commits)
  rtc: pcf8523: rename register and bit defines
  rtc: pcf2127: handle timestamp interrupts
  rtc: at91sam9: Remove unnecessary offset variable checks
  rtc: s5m: Check return value of s5m_check_peding_alarm_interrupt()
  rtc: spear: convert to SPDX identifier
  rtc: tps6586x: convert to SPDX identifier
  rtc: tps80031: convert to SPDX identifier
  rtc: rtd119x: Fix format of SPDX identifier
  rtc: sc27xx: Fix format of SPDX identifier
  rtc: palmas: convert to SPDX identifier
  rtc: max6900: convert to SPDX identifier
  rtc: ds1374: convert to SPDX identifier
  rtc: au1xxx: convert to SPDX identifier
  rtc: pcf85063: Update the PCF85063A datasheet revision
  dt-bindings: rtc: ti,bq32k: take maintainership
  rtc: pcf8563: Fix the datasheet URL
  rtc: pcf85063: Fix the datasheet URL
  rtc: pcf2127: Fix the datasheet URL
  dt-bindings: rtc: ti,bq32k: Convert to json-schema
  dt-bindings: rtc: rx8900: Convert to YAML schema
  ...

mm/page_alloc: Revert pahole zero-sized workaround

Commit dbbee9d5cd83 ("mm/page_alloc: convert per-cpu list protection to
local_lock") folded in a workaround patch for pahole that was unable to
deal with zero-sized percpu structures.

A superior workaround is achieved with commit a0b8200d06ad ("kbuild:
skip per-CPU BTF generation for pahole v1.18-v1.21").

This patch reverts the dummy field and the pahole version check.

Fixes: dbbee9d5cd83 ("mm/page_alloc: convert per-cpu list protection to local_lock")
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

rtc: pcf8523: rename register and bit defines

arch/arm/mach-ixp4xx/include/mach/platform.h now gets included indirectly
and defines REG_OFFSET. Rename the register and bit definition to something
specific to the driver.

Fixes: 7fd70c65faac ("ARM: irqstat: Get rid of duplicated declaration")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210710211431.1393589-1-alexandre.belloni@bootlin.com

Merge tag '5.14-rc-smb3-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6

Pull cifs fixes from Steve French:
"13 cifs/smb3 fixes. Most are to address minor issues pointed out by
  Coverity.

  Also includes a packet signing enhancement and mount improvement"

* tag '5.14-rc-smb3-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: update internal version number
  cifs: prevent NULL deref in cifs_compose_mount_options()
  SMB3.1.1: Add support for negotiating signing algorithm
  cifs: use helpers when parsing uid/gid mount options and validate them
  CIFS: Clarify SMB1 code for POSIX Lock
  CIFS: Clarify SMB1 code for rename open file
  CIFS: Clarify SMB1 code for delete
  CIFS: Clarify SMB1 code for SetFileSize
  smb3: fix typo in header file
  CIFS: Clarify SMB1 code for UnixSetPathInfo
  CIFS: Clarify SMB1 code for UnixCreateSymLink
  cifs: clarify SMB1 code for UnixCreateHardLink
  cifs: make locking consistent around the server session status

Merge tag 'pci-v5.14-fixes-1' of git://git./linux/kernel/git/helgaas/pci

Pull pci fix from Bjorn Helgaas:
"Revert host bridge window patch that fixed HP EliteDesk 805 G6, but
broke ppc:sam460ex (Bjorn Helgaas)"

* tag 'pci-v5.14-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci:
Revert "PCI: Coalesce host bridge contiguous apertures"

Merge tag 'i3c/for-5.14' of git://git./linux/kernel/git/i3c/linux

Pull i3c updates from Alexandre Belloni:

- two small fixes to the svc driver

* tag 'i3c/for-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/i3c/linux:
i3c: master: svc: fix doc warning in svc-i3c-master.c
i3c: master: svc: drop free_irq of devm_request_irq allocated irq

Merge tag 'thermal-v5.14-rc1' of git://git./linux/kernel/git/thermal/linux

Pull thermal updates from Daniel Lezcano:

- Add rk3568 sensor support (Finley Xiao)

- Add missing MODULE_DEVICE_TABLE for the Spreadtrum sensor (Chunyan
   Zhang)

- Export additionnal attributes for the int340x thermal processor
   (Srinivas Pandruvada)

- Add SC7280 compatible for the tsens driver (Rajeshwari Ravindra
   Kamble)

- Fix kernel documentation for thermal_zone_device_unregister() and use
   devm_platform_get_and_ioremap_resource() (Yang Yingliang)

- Fix coefficient calculations for the rcar_gen3 sensor driver (Niklas
   Söderlund)

- Fix shadowing variable rcar_gen3_ths_tj_1 (Geert Uytterhoeven)

- Add missing of_node_put() for the iMX and Spreadtrum sensors
   (Krzysztof Kozlowski)

- Add tegra3 thermal sensor DT bindings (Dmitry Osipenko)

- Stop the thermal zone monitoring when unregistering it to prevent a
   temperature update without the 'get_temp' callback (Dmitry Osipenko)

- Add rk3568 DT bindings, convert bindings to yaml schemas and add the
   corresponding compatible in the Rockchip sensor (Ezequiel Garcia)

- Add the sc8180x compatible for the Qualcomm tsensor (Bjorn Andersson)

- Use the find_first_zero_bit() function instead of custom code (Andy
   Shevchenko)

- Fix the kernel doc for the device cooling device (Yang Li)

- Reorg the processor thermal int340x to set the scene for the PCI mmio
   driver (Srinivas Pandruvada)

- Add PCI MMIO driver for the int340x processor thermal driver
   (Srinivas Pandruvada)

- Add hwmon sensors for the mediatek sensor (Frank Wunderlich)

- Fix warning for return value reported by Smatch for the int340x
   thermal processor (Srinivas Pandruvada)

- Fix wrong register access and decoding for the int340x thermal
   processor (Srinivas Pandruvada)

* tag 'thermal-v5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux: (23 commits)
  thermal/drivers/int340x/processor_thermal: Fix tcc setting
  thermal/drivers/int340x/processor_thermal: Fix warning for return value
  thermal/drivers/mediatek: Add sensors-support
  thermal/drivers/int340x/processor_thermal: Add PCI MMIO based thermal driver
  thermal/drivers/int340x/processor_thermal: Split enumeration and processing part
  thermal: devfreq_cooling: Fix kernel-doc
  thermal/drivers/intel/intel_soc_dts_iosf: Switch to use find_first_zero_bit()
  dt-bindings: thermal: tsens: Add sc8180x compatible
  dt-bindings: rockchip-thermal: Support the RK3568 SoC compatible
  dt-bindings: thermal: convert rockchip-thermal to json-schema
  thermal/core/thermal_of: Stop zone device before unregistering it
  dt-bindings: thermal: Add binding for Tegra30 thermal sensor
  thermal/drivers/sprd: Add missing of_node_put for loop iteration
  thermal/drivers/imx_sc: Add missing of_node_put for loop iteration
  thermal/drivers/rcar_gen3_thermal: Do not shadow rcar_gen3_ths_tj_1
  thermal/drivers/rcar_gen3_thermal: Fix coefficient calculations
  thermal/drivers/st: Use devm_platform_get_and_ioremap_resource()
  thermal/core: Correct function name thermal_zone_device_unregister()
  dt-bindings: thermal: tsens: Add compatible string to TSENS binding for SC7280
  thermal/drivers/int340x: processor_thermal: Export additional attributes
  ...

virtio_net: check virtqueue_add_sgs() return value

As virtqueue_add_sgs() can fail, we should check the return value.

Addresses-Coverity-ID: 1464439 ("Unchecked return value")
Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Merge tag 'kbuild-v5.14' of git://git./linux/kernel/git/masahiroy/linux-kbuild

Pull Kbuild updates from Masahiro Yamada:

- Increase the -falign-functions alignment for the debug option.

- Remove ugly libelf checks from the top Makefile.

- Make the silent build (-s) more silent.

- Re-compile the kernel if KBUILD_BUILD_TIMESTAMP is specified.

- Various script cleanups

* tag 'kbuild-v5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (27 commits)
  scripts: add generic syscallnr.sh
  scripts: check duplicated syscall number in syscall table
  sparc: syscalls: use pattern rules to generate syscall headers
  parisc: syscalls: use pattern rules to generate syscall headers
  nds32: add arch/nds32/boot/.gitignore
  kbuild: mkcompile_h: consider timestamp if KBUILD_BUILD_TIMESTAMP is set
  kbuild: modpost: Explicitly warn about unprototyped symbols
  kbuild: remove trailing slashes from $(KBUILD_EXTMOD)
  kconfig.h: explain IS_MODULE(), IS_ENABLED()
  kconfig: constify long_opts
  scripts/setlocalversion: simplify the short version part
  scripts/setlocalversion: factor out 12-chars hash construction
  scripts/setlocalversion: add more comments to -dirty flag detection
  scripts/setlocalversion: remove workaround for old make-kpkg
  scripts/setlocalversion: remove mercurial, svn and git-svn supports
  kbuild: clean up ${quiet} checks in shell scripts
  kbuild: sink stdout from cmd for silent build
  init: use $(call cmd,) for generating include/generated/compile.h
  kbuild: merge scripts/mkmakefile to top Makefile
  sh: move core-y in arch/sh/Makefile to arch/sh/Kbuild
  ...

Merge tag 's390-5.14-2' of git://git./linux/kernel/git/s390/linux

Pull more s390 updates from Vasily Gorbik:

- Fix preempt_count initialization.

- Rework call_on_stack() macro to add proper type handling and avoid
   possible register corruption.

- More error prone "register asm" removal and fixes.

- Fix syscall restarting when multiple signals are coming in. This adds
   minimalistic trampolines to vdso so we can return from signal without
   using the stack which requires pgm check handler hacks when NX is
   enabled.

- Remove HAVE_IRQ_EXIT_ON_IRQ_STACK since this is no longer true after
   switch to generic entry.

- Fix protected virtualization secure storage access exception
   handling.

- Make machine check C handler always enter with DAT enabled and move
   register validation to C code.

- Fix tinyconfig boot problem by avoiding MONITOR CALL without
   CONFIG_BUG.

- Increase asm symbols alignment to 16 to make it consistent with
   compilers.

- Enable concurrent access to the CPU Measurement Counter Facility.

- Add support for dynamic AP bus size limit and rework ap_dqap to deal
   with messages greater than recv buffer.

* tag 's390-5.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (41 commits)
  s390: preempt: Fix preempt_count initialization
  s390/linkage: increase asm symbols alignment to 16
  s390: rename CALL_ON_STACK_NORETURN() to call_on_stack_noreturn()
  s390: add type checking to CALL_ON_STACK_NORETURN() macro
  s390: remove old CALL_ON_STACK() macro
  s390/softirq: use call_on_stack() macro
  s390/lib: use call_on_stack() macro
  s390/smp: use call_on_stack() macro
  s390/kexec: use call_on_stack() macro
  s390/irq: use call_on_stack() macro
  s390/mm: use call_on_stack() macro
  s390: introduce proper type handling call_on_stack() macro
  s390/irq: simplify on_async_stack()
  s390/irq: inline do_softirq_own_stack()
  s390/irq: simplify do_softirq_own_stack()
  s390/ap: get rid of register asm in ap_dqap()
  s390: rename PIF_SYSCALL_RESTART to PIF_EXECVE_PGSTE_RESTART
  s390: move restart of execve() syscall
  s390/signal: remove sigreturn on stack
  s390/signal: switch to using vdso for sigreturn and syscall restart
  ...

Merge tag 'mips_5.14_1' of git://git./linux/kernel/git/mips/linux

Pull MIPS fixes from Thomas Bogendoerfer:

- fix for accesing gic via vdso

- two build fixes

* tag 'mips_5.14_1' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux:
  MIPS: vdso: Invalid GIC access through VDSO
  mips: disable branch profiling in boot/decompress.o
  mips: always link byteswap helpers into decompressor

Merge tag 'arm-defconfig-5.14' of git://git./linux/kernel/git/soc/soc

Pull ARM defconfig updates from "Olof Johansson
"A set of defconfig changes, we keep them in a separate branch to avoid
  conflicts between topics by separating them out.

  These changes are almost exclusively turning on new drivers for
  various platforms, or turning on modules for new drivers for the
  shared generic configs"

* tag 'arm-defconfig-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (22 commits)
  arm64: defconfig: Enable renesas usb xhci pci host controller
  arm64: defconfig: Visconti: Enable GPIO
  arm64: defconfig: Visconti: Enable PWM
  arm64: defconfig: add drivers needed for DragonBoard410c
  ARM: config: aspeed: Add DEBUG_FS and EXT4
  ARM: ixp4xx_defconfig: add MTD_PHYSMAP
  ARM: ixp4xx_defconfig: add CONFIG_SERIAL_OF_PLATFORM
  ARM: imx_v6_v7_defconfig: Select the Wifi ath10k sdio driver
  ARM: exynos_defconfig: restore framebuffer support
  arm64: defconfig: Enable ARCH_R9A07G044
  ARM: configs: at91_dt_defconfig: configs for sam9x60
  arm64: defconfig: Enable Exynos UFS driver
  arm64: defconfig: qcom: enable interconnect for SM8350
  ARM: tegra_defconfig: Enable CONFIG_DEVFREQ_THERMAL
  arm64: defconfig: Enable usb2_clksel for R-Car Gen3 and RZ/G2
  arm64: defconfig: enable Layerscape EDAC driver
  ARM: omap2plus_defconfig: Add LP5523 LED driver
  ARM: omap2plus_defconfig: Add WL1251 and WEXT modules
  ARM: shmobile: defconfig: Refresh for v5.13-rc1
  arm64: defconfig: Allow Mediatek boards to boot from the mmc
  ...

Merge tag 'arm-drivers-5.14' of git://git./linux/kernel/git/soc/soc

Pull ARM driver updates from Olof Johansson:

- Reset controllers: Adding support for Microchip Sparx5 Switch.

- Memory controllers: ARM Primecell PL35x SMC memory controller driver
   cleanups and improvements.

- i.MX SoC drivers: Power domain support for i.MX8MM and i.MX8MN.

- Rockchip: RK3568 power domains support + DT binding updates,
   cleanups.

- Qualcomm SoC drivers: Amend socinfo with more SoC/PMIC details,
   including support for MSM8226, MDM9607, SM6125 and SC8180X.

- ARM FFA driver: "Firmware Framework for ARMv8-A", defining management
   interfaces and communication (including bus model) between partitions
   both in Normal and Secure Worlds.

- Tegra Memory controller changes, including major rework to deal with
   identity mappings at boot and integration with ARM SMMU pieces.

* tag 'arm-drivers-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (120 commits)
  firmware: turris-mox-rwtm: add marvell,armada-3700-rwtm-firmware compatible string
  firmware: turris-mox-rwtm: show message about HWRNG registration
  firmware: turris-mox-rwtm: fail probing when firmware does not support hwrng
  firmware: turris-mox-rwtm: report failures better
  firmware: turris-mox-rwtm: fix reply status decoding function
  soc: imx: gpcv2: add support for i.MX8MN power domains
  dt-bindings: add defines for i.MX8MN power domains
  firmware: tegra: bpmp: Fix Tegra234-only builds
  iommu/arm-smmu: Use Tegra implementation on Tegra186
  iommu/arm-smmu: tegra: Implement SID override programming
  iommu/arm-smmu: tegra: Detect number of instances at runtime
  dt-bindings: arm-smmu: Add Tegra186 compatible string
  firmware: qcom_scm: Add MDM9607 compatible
  soc: qcom: rpmpd: Add MDM9607 RPM Power Domains
  soc: renesas: Add support to read LSI DEVID register of RZ/G2{L,LC} SoC's
  soc: renesas: Add ARCH_R9A07G044 for the new RZ/G2L SoC's
  dt-bindings: soc: rockchip: drop unnecessary #phy-cells from grf.yaml
  memory: emif: remove unused frequency and voltage notifiers
  memory: fsl_ifc: fix leak of private memory on probe failure
  memory: fsl_ifc: fix leak of IO mapping on probe failure
  ...

Merge tag 'arm-dt-5.14' of git://git./linux/kernel/git/soc/soc

Pull ARM devicetree updates from Olof Johansson:
"Like always, the DT branch is sizable. There are numerous additions
  and fixes to existing platforms, but also a handful of new ones
  introduced. Less than some other releases, but there's been
  significant work on cleanups, refactorings and device enabling on
  existing platforms.

  A non-exhaustive list of new material:

   - Refactoring of BCM2711 dtsi structure to add support for the
     Raspberry Pi 400

   - Rockchip: RK3568 SoC and EVB, video codecs for
     rk3036/3066/3188/322x

   - Qualcomm: SA8155p Automotive platform (SM8150 derivative),
     SM8150/8250 enhancements and support for Sony Xperia 1/1II and
     5/5II

   - TI K3: PCI/USB3 support on AM64-sk boards, R5 remoteproc
     definitions

   - TI OMAP: Various cleanups

   - Tegra: Audio support for Jetson Xavier NX, SMMU support on Tegra194

   - Qualcomm: lots of additions for peripherals across several SoCs,
     and new support for Microsoft Surface Duo (SM8150-based), Huawei
     Ascend G7.

   - i.MX: Numerous additions of features across SoCs and boards.

   - Allwinner: More device bindings for V3s, Forlinx OKA40i-C and
     NanoPi R1S H5 boards

   - MediaTek: More device bindings for mt8167, new Chromebook system
     variants for mt8183

   - Renesas: RZ/G2L SoC and EVK added

   - Amlogic: BananaPi BPI-M5 board added"

* tag 'arm-dt-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (511 commits)
  arm64: dts: rockchip: add basic dts for RK3568 EVB
  arm64: dts: rockchip: add core dtsi for RK3568 SoC
  arm64: dts: rockchip: add generic pinconfig settings used by most Rockchip socs
  ARM: dts: rockchip: add vpu and vdec node for RK322x
  ARM: dts: rockchip: add vpu nodes for RK3066 and RK3188
  ARM: dts: rockchip: add vpu node for RK3036
  arm64: dts: ipq8074: Add QUP6 I2C node
  arm64: dts: rockchip: Re-add regulator-always-on for vcc_sdio for rk3399-roc-pc
  arm64: dts: rockchip: Re-add regulator-boot-on, regulator-always-on for vdd_gpu on rk3399-roc-pc
  arm64: dts: rockchip: add ir-receiver for rk3399-roc-pc
  arm64: dts: rockchip: Add USB-C port details for rk3399 Firefly
  arm64: dts: rockchip: Sort rk3399 firefly pinmux entries
  arm64: dts: rockchip: add infrared receiver node to RK3399 Firefly
  arm64: dts: rockchip: add SPDIF node for rk3399-firefly
  arm64: dts: rockchip: Add Rotation Property for OGA Panel
  arm64: dts: qcom: sc7180: bus votes for eMMC and SD card
  arm64: dts: qcom: sm8250-edo: Add Samsung touchscreen
  arm64: dts: qcom: sm8250-edo: Enable GPI DMA
  arm64: dts: qcom: sm8250-edo: Enable ADSP/CDSP/SLPI
  arm64: dts: qcom: sm8250-edo: Enable PCIe
  ...

Merge tag 'arm-soc-5.14' of git://git./linux/kernel/git/soc/soc

Pull ARM SoC updates from Olof Johansson:
"A few SoC (code) changes have queued up this cycle, mostly for minor
  changes and some refactoring and cleanup of legacy platforms. This
  branch also contains a few of the fixes that weren't sent in by the
  end of the release (all fairly minor).

   - Adding an additional maintainer for the TEE subsystem (Sumit Garg)

   - Quite a significant modernization of the IXP4xx platforms by Linus
     Walleij, revisiting with a new PCI host driver/binding, removing
     legacy mach/* include dependencies and moving platform
     detection/config to drivers/soc. Also some updates/cleanup of
     platform data.

   - Core power domain support for Tegra platforms, and some
     improvements in build test coverage by adding stubs for compile
     test targets.

   - A handful of updates to i.MX platforms, adding legacy (non-PSCI)
     SMP support on i.MX7D, SoC ID setup for i.MX50, removal of platform
     data and board fixups for iMX6/7.

  ... and a few smaller changes and fixes for Samsung, OMAP, Allwinner,
  Rockchip"

* tag 'arm-soc-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (53 commits)
  MAINTAINERS: Add myself as TEE subsystem reviewer
  ixp4xx: fix spelling mistake in Kconfig "Devce" -> "Device"
  hw_random: ixp4xx: Add OF support
  hw_random: ixp4xx: Add DT bindings
  hw_random: ixp4xx: Turn into a module
  hw_random: ixp4xx: Use SPDX license tag
  hw_random: ixp4xx: enable compile-testing
  pata: ixp4xx: split platform data to its own header
  soc: ixp4xx: move cpu detection to linux/soc/ixp4xx/cpu.h
  PCI: ixp4xx: Add a new driver for IXP4xx
  PCI: ixp4xx: Add device tree bindings for IXP4xx
  ARM/ixp4xx: Make NEED_MACH_IO_H optional
  ARM/ixp4xx: Move the virtual IObases
  MAINTAINERS: ARM/MStar/Sigmastar SoCs: Add a link to the MStar tree
  ARM: debug: add UART early console support for MSTAR SoCs
  ARM: dts: ux500: Fix LED probing
  ARM: imx: add smp support for imx7d
  ARM: imx6q: drop of_platform_default_populate() from init_machine
  arm64: dts: rockchip: Update RK3399 PCI host bridge window to 32-bit address memory
  soc/tegra: fuse: Fix Tegra234-only builds
  ...

Merge tag 'fixes-2021-07-09' of git://git./linux/kernel/git/rppt/memblock

Pull memblock fix from Mike Rapoport:
"This is a fix for the rework of ARM's pfn_valid() implementation
  merged during this merge window.

  Don't abuse pfn_valid() to check if pfn is in RAM

  The semantics of pfn_valid() is to check presence of the memory map
  for a PFN and not whether a PFN is in RAM. The memory map may be
  present for a hole in the physical memory and if such hole corresponds
  to an MMIO range, __arm_ioremap_pfn_caller() will produce a WARN() and
  fail.

  Use memblock_is_map_memory() instead of pfn_valid() to check if a PFN
  is in RAM or not"

* tag 'fixes-2021-07-09' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock:
  arm: ioremap: don't abuse pfn_valid() to check if pfn is in RAM

Merge branch 'for-5.14-fixes' of git://git./linux/kernel/git/dennis/percpu

Pull percpu fix from Dennis Zhou:
"This is just a single change to fix percpu depopulation. The code
  relied on depopulation code written specifically for the free path and
  relied on vmalloc to do the tlb flush lazily. As we're modifying the
  backing pages during the lifetime of a chunk, we need to also flush
  the tlb accordingly.

  Guenter Roeck reported this issue in [1] on mips. I believe we just
  happen to be lucky given the much larger chunk sizes on x86 and
  consequently less churning of this memory"

Link: https://lore.kernel.org/lkml/20210702191140.GA3166599@roeck-us.net/
* 'for-5.14-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu:
  percpu: flush tlb in pcpu_reclaim_populated()

Merge branch 'mptcp-Connection-and-accounting-fixes'

Mat Martineau says:

====================
mptcp: Connection and accounting fixes

Here are some miscellaneous fixes for MPTCP:

Patch 1 modifies an MPTCP hash so it doesn't depend on one of skb->dev
and skb->sk being non-NULL.

Patch 2 removes an extra destructor call when rejecting a join due to
port mismatch.

Patches 3 and 5 more cleanly handle error conditions with MP_JOIN and
syncookies, and update a related self test.

Patch 4 makes sure packets that trigger a subflow TCP reset during MPTCP
option header processing are correctly dropped.

Patch 6 addresses a rmem accounting issue that could keep packets in
subflow receive buffers longer than necessary, delaying MPTCP-level
ACKs.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

mptcp: properly account bulk freed memory

After commit 879526030c8b ("mptcp: protect the rx path with
the msk socket spinlock") the rmem currently used by a given
msk is really sk_rmem_alloc - rmem_released.

The safety check in mptcp_data_ready() does not take the above
in due account, as a result legit incoming data is kept in
subflow receive queue with no reason, delaying or blocking
MPTCP-level ack generation.

This change addresses the issue introducing a new helper to fetch
the rmem memory and using it as needed. Additionally add a MIB
counter for the exceptional event described above - the peer is
misbehaving.

Finally, introduce the required annotation when rmem_released is
updated.

Fixes: 879526030c8b ("mptcp: protect the rx path with the msk socket spinlock")
Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/211
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

selftests: mptcp: fix case multiple subflows limited by server

After patch "mptcp: fix syncookie process if mptcp can not_accept new
subflow", if subflow is limited, MP_JOIN SYN is dropped, and no SYN/ACK
will be replied.

So in case "multiple subflows limited by server", the expected SYN/ACK
number should be 1.

Fixes: 00587187ad30 ("selftests: mptcp: add test cases for mptcp join tests with syn cookies")
Reported-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Jianguo Wu <wujianguo@chinatelecom.cn>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

mptcp: avoid processing packet if a subflow reset

If check_fully_established() causes a subflow reset, it should not
continue to process the packet in tcp_data_queue().
Add a return value to mptcp_incoming_options(), and return false if a
subflow has been reset, else return true. Then drop the packet in
tcp_data_queue()/tcp_rcv_state_process() if mptcp_incoming_options()
return false.

Fixes: d582484726c4 ("mptcp: fix fallback for MP_JOIN subflows")
Signed-off-by: Jianguo Wu <wujianguo@chinatelecom.cn>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

mptcp: fix syncookie process if mptcp can not_accept new subflow

Lots of "TCP: tcp_fin: Impossible, sk->sk_state=7" in client side
when doing stress testing using wrk and webfsd.

There are at least two cases may trigger this warning:
1.mptcp is in syncookie, and server recv MP_JOIN SYN request,
  in subflow_check_req(), the mptcp_can_accept_new_subflow()
  return false, so subflow_init_req_cookie_join_save() isn't
  called, i.e. not store the data present in the MP_JOIN syn
  request and the random nonce in hash table - join_entries[],
  but still send synack. When recv 3rd-ack,
  mptcp_token_join_cookie_init_state() will return false, and
  3rd-ack is dropped, then if mptcp conn is closed by client,
  client will send a DATA_FIN and a MPTCP FIN, the DATA_FIN
  doesn't have MP_CAPABLE or MP_JOIN,
  so mptcp_subflow_init_cookie_req() will return 0, and pass
  the cookie check, MP_JOIN request is fallback to normal TCP.
  Server will send a TCP FIN if closed, in client side,
  when process TCP FIN, it will do reset, the code path is:
    tcp_data_queue()->mptcp_incoming_options()
      ->check_fully_established()->mptcp_subflow_reset().
  mptcp_subflow_reset() will set sock state to TCP_CLOSE,
  so tcp_fin will hit TCP_CLOSE, and print the warning.

2.mptcp is in syncookie, and server recv 3rd-ack, in
  mptcp_subflow_init_cookie_req(), mptcp_can_accept_new_subflow()
  return false, and subflow_req->mp_join is not set to 1,
  so in subflow_syn_recv_sock() will not reset the MP_JOIN
  subflow, but fallback to normal TCP, and then the same thing
  happens when server will send a TCP FIN if closed.

For case1, subflow_check_req() return -EPERM,
then tcp_conn_request() will drop MP_JOIN SYN.

For case2, let subflow_syn_recv_sock() call
mptcp_can_accept_new_subflow(), and do fatal fallback, send reset.

Fixes: 9466a1ccebbe ("mptcp: enable JOIN requests even if cookies are in use")
Signed-off-by: Jianguo Wu <wujianguo@chinatelecom.cn>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

mptcp: remove redundant req destruct in subflow_check_req()

In subflow_check_req(), if subflow sport is mismatch, will put msk,
destroy token, and destruct req, then return -EPERM, which can be
done by subflow_req_destructor() via:

  tcp_conn_request()
    |--__reqsk_free()
      |--subflow_req_destructor()

So we should remove these redundant code, otherwise will call
tcp_v4_reqsk_destructor() twice, and may double free
inet_rsk(req)->ireq_opt.

Fixes: 5bc56388c74f ("mptcp: add port number check for MP_JOIN")
Signed-off-by: Jianguo Wu <wujianguo@chinatelecom.cn>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

mptcp: fix warning in __skb_flow_dissect() when do syn cookie for subflow join

I did stress test with wrk[1] and webfsd[2] with the assistance of
mptcp-tools[3]:

  Server side:
      ./use_mptcp.sh webfsd -4 -R /tmp/ -p 8099
  Client side:
      ./use_mptcp.sh wrk -c 200 -d 30 -t 4 http://192.168.174.129:8099/

and got the following warning message:

[   55.552626] TCP: request_sock_subflow: Possible SYN flooding on port 8099. Sending cookies.  Check SNMP counters.
[   55.553024] ------------[ cut here ]------------
[   55.553027] WARNING: CPU: 0 PID: 10 at net/core/flow_dissector.c:984 __skb_flow_dissect+0x280/0x1650
...
[   55.553117] CPU: 0 PID: 10 Comm: ksoftirqd/0 Not tainted 5.12.0+ #18
[   55.553121] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 02/27/2020
[   55.553124] RIP: 0010:__skb_flow_dissect+0x280/0x1650
...
[   55.553133] RSP: 0018:ffffb79580087770 EFLAGS: 00010246
[   55.553137] RAX: 0000000000000000 RBX: ffffffff8ddb58e0 RCX: ffffb79580087888
[   55.553139] RDX: ffffffff8ddb58e0 RSI: ffff8f7e4652b600 RDI: 0000000000000000
[   55.553141] RBP: ffffb79580087858 R08: 0000000000000000 R09: 0000000000000008
[   55.553143] R10: 000000008c622965 R11: 00000000d3313a5b R12: ffff8f7e4652b600
[   55.553146] R13: ffff8f7e465c9062 R14: 0000000000000000 R15: ffffb79580087888
[   55.553149] FS:  0000000000000000(0000) GS:ffff8f7f75e00000(0000) knlGS:0000000000000000
[   55.553152] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   55.553154] CR2: 00007f73d1d19000 CR3: 0000000135e10004 CR4: 00000000003706f0
[   55.553160] Call Trace:
[   55.553166]  ? __sha256_final+0x67/0xd0
[   55.553173]  ? sha256+0x7e/0xa0
[   55.553177]  __skb_get_hash+0x57/0x210
[   55.553182]  subflow_init_req_cookie_join_save+0xac/0xc0
[   55.553189]  subflow_check_req+0x474/0x550
[   55.553195]  ? ip_route_output_key_hash+0x67/0x90
[   55.553200]  ? xfrm_lookup_route+0x1d/0xa0
[   55.553207]  subflow_v4_route_req+0x8e/0xd0
[   55.553212]  tcp_conn_request+0x31e/0xab0
[   55.553218]  ? selinux_socket_sock_rcv_skb+0x116/0x210
[   55.553224]  ? tcp_rcv_state_process+0x179/0x6d0
[   55.553229]  tcp_rcv_state_process+0x179/0x6d0
[   55.553235]  tcp_v4_do_rcv+0xaf/0x220
[   55.553239]  tcp_v4_rcv+0xce4/0xd80
[   55.553243]  ? ip_route_input_rcu+0x246/0x260
[   55.553248]  ip_protocol_deliver_rcu+0x35/0x1b0
[   55.553253]  ip_local_deliver_finish+0x44/0x50
[   55.553258]  ip_local_deliver+0x6c/0x110
[   55.553262]  ? ip_rcv_finish_core.isra.19+0x5a/0x400
[   55.553267]  ip_rcv+0xd1/0xe0
...

After debugging, I found in __skb_flow_dissect(), skb->dev and skb->sk
are both NULL, then net is NULL, and trigger WARN_ON_ONCE(!net),
actually net is always NULL in this code path, as skb->dev is set to
NULL in tcp_v4_rcv(), and skb->sk is never set.

Code snippet in __skb_flow_dissect() that trigger warning:
  975         if (skb) {
  976                 if (!net) {
  977                         if (skb->dev)
  978                                 net = dev_net(skb->dev);
  979                         else if (skb->sk)
  980                                 net = sock_net(skb->sk);
  981                 }
  982         }
  983
  984         WARN_ON_ONCE(!net);

So, using seq and transport header derived hash.

[1] https://github.com/wg/wrk
[2] https://github.com/ourway/webfsd
[3] https://github.com/pabeni/mptcp-tools

Fixes: 9466a1ccebbe ("mptcp: enable JOIN requests even if cookies are in use")
Suggested-by: Paolo Abeni <pabeni@redhat.com>
Suggested-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Jianguo Wu <wujianguo@chinatelecom.cn>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

rtc: pcf2127: handle timestamp interrupts

commit 03623b4b041c ("rtc: pcf2127: add tamper detection support")
added support for timestamp interrupts. However they are not being
handled in the irq handler. If a timestamp interrupt occurs it
results in kernel disabling the interrupt and displaying the call
trace:

[  121.145580] irq 78: nobody cared (try booting with the "irqpoll" option)
...
[  121.238087] [<00000000c4d69393>] irq_default_primary_handler threaded [<000000000a90d25b>] pcf2127_rtc_irq [rtc_pcf2127]
[  121.248971] Disabling IRQ #78

Handle timestamp interrupts in pcf2127_rtc_irq(). Save time stamp
before clearing TSF1 and TSF2 flags so that it can't be overwritten.
Set a flag to mark if the timestamp is valid and only report to sysfs
if the flag is set. To mimic the hardware behavior, don’t save
another timestamp until the first one has been read by the userspace.

However, if the alarm irq is not configured, keep the old way of
handling timestamp interrupt in the timestamp0 sysfs calls.

Signed-off-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Reviewed-by: Bruno Thomsen <bruno.thomsen@gmail.com>
Tested-by: Bruno Thomsen <bruno.thomsen@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210629150643.31551-1-ykaukab@suse.de

rtc: at91sam9: Remove unnecessary offset variable checks

The offset variable is checked by at91_rtc_readalarm(), but this check
is unnecessary because the previous check knew that the value of this
variable was not 0.
This removes that unnecessary offset variable checks.

Cc: Nicolas Ferre <nicolas.ferre@microchip.com>
Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210708051340.341345-1-nobuhiro1.iwamatsu@toshiba.co.jp

rtc: s5m: Check return value of s5m_check_peding_alarm_interrupt()

s5m_check_peding_alarm_interrupt() in s5m_rtc_read_alarm() gets the return
value, but doesn't use it.
This modifies using the s5m_check_peding_alarm_interrupt()"s return value
as the s5m_rtc_read_alarm()'s return value.

Cc: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: linux-samsung-soc@vger.kernel.org
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210708051304.341278-1-nobuhiro1.iwamatsu@toshiba.co.jp

rtc: spear: convert to SPDX identifier

Use SPDX-License-Identifier instead of a verbose license text.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210707075804.337458-11-nobuhiro1.iwamatsu@toshiba.co.jp

rtc: tps6586x: convert to SPDX identifier

Use SPDX-License-Identifier instead of a verbose license text.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210707075804.337458-9-nobuhiro1.iwamatsu@toshiba.co.jp

rtc: tps80031: convert to SPDX identifier

Use SPDX-License-Identifier instead of a verbose license text.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210707075804.337458-8-nobuhiro1.iwamatsu@toshiba.co.jp

rtc: rtd119x: Fix format of SPDX identifier

For C files, use the C99 format (//).

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210707075804.337458-7-nobuhiro1.iwamatsu@toshiba.co.jp

rtc: sc27xx: Fix format of SPDX identifier

For C files, use the C99 format (//).

Cc: Orson Zhai <orsonzhai@gmail.com>
Cc: Baolin Wang <baolin.wang7@gmail.com>
Cc: Chunyan Zhang <zhang.lyra@gmail.com>
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210707075804.337458-6-nobuhiro1.iwamatsu@toshiba.co.jp

rtc: palmas: convert to SPDX identifier

Use SPDX-License-Identifier instead of a verbose license text.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210707075804.337458-5-nobuhiro1.iwamatsu@toshiba.co.jp

rtc: max6900: convert to SPDX identifier

Use SPDX-License-Identifier instead of a verbose license text.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210707075804.337458-4-nobuhiro1.iwamatsu@toshiba.co.jp