zhang jiao [Thu, 6 Nov 2025 01:07:34 +0000 (09:07 +0800)]
fs/proc/page: remove unused KPMBITS
KPMBITS is never referenced in the code. Just remove it.
Link: https://lkml.kernel.org/r/20251106010735.1603-1-zhangjiao2@cmss.chinamobile.com
Signed-off-by: zhang jiao <zhangjiao2@cmss.chinamobile.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Liu Ye <liuye@kylinos.cn>
Cc: Luiz Capitulino <luizcap@redhat.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Andy Shevchenko [Thu, 6 Nov 2025 15:20:51 +0000 (16:20 +0100)]
math.h: amend abs() kernel-doc and add a note about signed type limits
- amend the kernel-doc so the description is decoupled from the
parameter descriptions.
- add a note to explain behaviour for the signed types when supplied
value is the minimum (e.g., INT_MIN for int type).
Link: https://lkml.kernel.org/r/20251106152051.2361551-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Ilya Leoshkevich [Thu, 6 Nov 2025 12:43:42 +0000 (13:43 +0100)]
scripts/gdb/symbols: make BPF debug info available to GDB
One can debug BPF programs with QEMU gdbstub by setting a breakpoint on
bpf_prog_kallsyms_add(), waiting for a hit with a matching aux.name, and
then setting a breakpoint on bpf_func. This is tedious, error-prone, and
also lacks line numbers.
Automate this in a way similar to the existing support for modules in
lx-symbols.
Enumerate and monitor changes to both BPF kallsyms and JITed progs. For
each ksym, generate and compile a synthetic .s file containing the name,
code, and size. In addition, if this ksym is also a prog, and not a
trampoline, add line number information.
Ensure that this is a no-op if the kernel is built without BPF support or
if "as" is missing. In theory the "as" dependency may be dropped by
generating the synthetic .o file manually, but this is too much complexity
for too little benefit.
Now one can debug BPF progs out of the box like this:
(gdb) lx-symbols -bpf
(gdb) b bpf_prog_4e612a6a881a086b_arena_list_add
Breakpoint 2 (bpf_prog_4e612a6a881a086b_arena_list_add) pending.
# ./test_progs -t arena_list
Thread 4 hit Breakpoint 2, bpf_prog_4e612a6a881a086b_arena_list_add ()
at linux/tools/testing/selftests/bpf/progs/arena_list.c:51
51 list_head = &global_head;
(gdb) n
bpf_prog_4e612a6a881a086b_arena_list_add () at linux/tools/testing/selftests/bpf/progs/arena_list.c:53
53 for (i = zero; i < cnt && can_loop; i++) {
This also works for subprogs.
Link: https://lkml.kernel.org/r/20251106124600.86736-3-iii@linux.ibm.com
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Daniel Borkman <daniel@iogearbox.net>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Ilya Leoshkevich [Thu, 6 Nov 2025 12:43:41 +0000 (13:43 +0100)]
scripts/gdb/radix-tree: add lx-radix-tree-command
Patch series "scripts/gdb/symbols: make BPF debug info available to GDB",
v2.
This series greatly simplifies debugging BPF progs when using QEMU gdbstub
by providing symbol names, sizes, and line numbers to GDB.
Patch 1 adds radix tree iteration, which is necessary for parsing
prog_idr. Patch 2 is the actual implementation; its description contains
some details on how to use this.
This patch (of 2):
Add a function and a command to iterate over radix tree contents.
Duplicate the C implementation in Python, but drop support for tagging.
Link: https://lkml.kernel.org/r/20251106124600.86736-1-iii@linux.ibm.com
Link: https://lkml.kernel.org/r/20251106124600.86736-2-iii@linux.ibm.com
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Daniel Borkman <daniel@iogearbox.net>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Pratyush Yadav [Wed, 5 Nov 2025 10:20:19 +0000 (11:20 +0100)]
MAINTAINERS: add Pratyush as a reviewer for KHO
I have been reviewing most patches for KHO already, and it is easier to
spot them if I am directly in Cc.
Link: https://lkml.kernel.org/r/20251105102022.18798-1-pratyush@kernel.org
Signed-off-by: Pratyush Yadav <pratyush@kernel.org>
Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Alexander Graf <graf@amazon.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Pratyush Yadav <pratyush@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
David Laight [Wed, 5 Nov 2025 20:10:35 +0000 (20:10 +0000)]
lib: test_mul_u64_u64_div_u64(): test the 32bit code on 64bit
There are slight differences in the mul_u64_add_u64_div_u64() code between
32bit and 64bit systems.
Compile and test the 32bit version on 64bit hosts for better test
coverage.
Link: https://lkml.kernel.org/r/20251105201035.64043-10-david.laight.linux@gmail.com
Signed-off-by: David Laight <david.laight.linux@gmail.com>
Reviewed-by: Nicolas Pitre <npitre@baylibre.com>
Cc: Biju Das <biju.das.jz@bp.renesas.com>
Cc: Borislav Betkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Li RongQing <lirongqing@baidu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
David Laight [Wed, 5 Nov 2025 20:10:34 +0000 (20:10 +0000)]
lib: mul_u64_u64_div_u64(): optimise the divide code
Replace the bit by bit algorithm with one that generates 16 bits per
iteration on 32bit architectures and 32 bits on 64bit ones.
On my zen 5 this reduces the time for the tests (using the generic code)
from ~3350ns to ~1000ns.
Running the 32bit algorithm on 64bit x86 takes ~1500ns. It'll be slightly
slower on a real 32bit system, mostly due to register pressure.
The savings for 32bit x86 are much higher (tested in userspace). The
worst case (lots of bits in the quotient) drops from ~900 clocks to ~130
(pretty much independant of the arguments). Other 32bit architectures may
see better savings.
It is possibly to optimise for divisors that span less than
__LONG_WIDTH__/2 bits. However I suspect they don't happen that often and
it doesn't remove any slow cpu divide instructions which dominate the
result.
Typical improvements for 64bit random divides:
old new
sandy bridge: 470 150
haswell: 400 144
piledriver: 960 467 I think rdpmc is very slow.
zen5: 244 80
(Timing is 'rdpmc; mul_div(); rdpmc' with the multiply depending on the
first rdpmc and the second rdpmc depending on the quotient.)
Object code (64bit x86 test program): old 0x173 new 0x141.
Link: https://lkml.kernel.org/r/20251105201035.64043-9-david.laight.linux@gmail.com
Signed-off-by: David Laight <david.laight.linux@gmail.com>
Reviewed-by: Nicolas Pitre <npitre@baylibre.com>
Cc: Biju Das <biju.das.jz@bp.renesas.com>
Cc: Borislav Betkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Li RongQing <lirongqing@baidu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
David Laight [Wed, 5 Nov 2025 20:10:33 +0000 (20:10 +0000)]
lib: mul_u64_u64_div_u64(): optimise multiply on 32bit x86
gcc generates horrid code for both ((u64)u32_a * u32_b) and (u64_a +
u32_b). As well as the extra instructions it can generate a lot of spills
to stack (including spills of constant zeros and even multiplies by
constant zero).
mul_u32_u32() already exists to optimise the multiply. Add a similar
add_u64_32() for the addition. Disable both for clang - it generates
better code without them.
Move the 64x64 => 128 multiply into a static inline helper function for
code clarity. No need for the a/b_hi/lo variables, the implicit casts on
the function calls do the work for us. Should have minimal effect on the
generated code.
Use mul_u32_u32() and add_u64_u32() in the 64x64 => 128 multiply in
mul_u64_add_u64_div_u64().
Link: https://lkml.kernel.org/r/20251105201035.64043-8-david.laight.linux@gmail.com
Signed-off-by: David Laight <david.laight.linux@gmail.com>
Reviewed-by: Nicolas Pitre <npitre@baylibre.com>
Cc: Biju Das <biju.das.jz@bp.renesas.com>
Cc: Borislav Betkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Li RongQing <lirongqing@baidu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
David Laight [Wed, 5 Nov 2025 20:10:32 +0000 (20:10 +0000)]
lib: test_mul_u64_u64_div_u64(): test both generic and arch versions
Change the #if in div64.c so that test_mul_u64_u64_div_u64.c can compile
and test the generic version (including the 'long multiply') on
architectures (eg amd64) that define their own copy.
Test the kernel version and the locally compiled version on all arch.
Output the time taken (in ns) on the 'test completed' trace.
For reference, on my zen 5, the optimised version takes ~220ns and the
generic version ~3350ns. Using the native multiply saves ~200ns and
adding back the ilog2() 'optimisation' test adds ~50ms.
Link: https://lkml.kernel.org/r/20251105201035.64043-7-david.laight.linux@gmail.com
Signed-off-by: David Laight <david.laight.linux@gmail.com>
Reviewed-by: Nicolas Pitre <npitre@baylibre.com>
Cc: Biju Das <biju.das.jz@bp.renesas.com>
Cc: Borislav Betkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Li RongQing <lirongqing@baidu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
David Laight [Wed, 5 Nov 2025 20:10:31 +0000 (20:10 +0000)]
lib: add tests for mul_u64_u64_div_u64_roundup()
Replicate the existing mul_u64_u64_div_u64() test cases with round up.
Update the shell script that verifies the table, remove the comment
markers so that it can be directly pasted into a shell.
Rename the divisor from 'c' to 'd' to match mul_u64_add_u64_div_u64().
It any tests fail then fail the module load with -EINVAL.
Link: https://lkml.kernel.org/r/20251105201035.64043-6-david.laight.linux@gmail.com
Signed-off-by: David Laight <david.laight.linux@gmail.com>
Reviewed-by: Nicolas Pitre <npitre@baylibre.com>
Cc: Biju Das <biju.das.jz@bp.renesas.com>
Cc: Borislav Betkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Li RongQing <lirongqing@baidu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
David Laight [Wed, 5 Nov 2025 20:10:30 +0000 (20:10 +0000)]
lib: add mul_u64_add_u64_div_u64() and mul_u64_u64_div_u64_roundup()
The existing mul_u64_u64_div_u64() rounds down, a 'rounding up' variant
needs 'divisor - 1' adding in between the multiply and divide so cannot
easily be done by a caller.
Add mul_u64_add_u64_div_u64(a, b, c, d) that calculates (a * b + c)/d and
implement the 'round down' and 'round up' using it.
Update the x86-64 asm to optimise for 'c' being a constant zero.
Add kerndoc definitions for all three functions.
Link: https://lkml.kernel.org/r/20251105201035.64043-5-david.laight.linux@gmail.com
Signed-off-by: David Laight <david.laight.linux@gmail.com>
Reviewed-by: Nicolas Pitre <npitre@baylibre.com>
Cc: Biju Das <biju.das.jz@bp.renesas.com>
Cc: Borislav Betkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Li RongQing <lirongqing@baidu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
David Laight [Wed, 5 Nov 2025 20:10:29 +0000 (20:10 +0000)]
lib: mul_u64_u64_div_u64(): simplify check for a 64bit product
If the product is only 64bits div64_u64() can be used for the divide.
Replace the pre-multiply check (ilog2(a) + ilog2(b) <= 62) with a simple
post-multiply check that the high 64bits are zero.
This has the advantage of being simpler, more accurate and less code. It
will always be faster when the product is larger than 64bits.
Most 64bit cpu have a native 64x64=128 bit multiply, this is needed (for
the low 64bits) even when div64_u64() is called - so the early check gains
nothing and is just extra code.
32bit cpu will need a compare (etc) to generate the 64bit ilog2() from two
32bit bit scans - so that is non-trivial. (Never mind the mess of x86's
'bsr' and any oddball cpu without fast bit-scan instructions.) Whereas the
additional instructions for the 128bit multiply result are pretty much one
multiply and two adds (typically the 'adc $0,%reg' can be run in parallel
with the instruction that follows).
The only outliers are 64bit systems without 128bit mutiply and simple in
order 32bit ones with fast bit scan but needing extra instructions to get
the high bits of the multiply result. I doubt it makes much difference to
either, the latter is definitely not mainstream.
If anyone is worried about the analysis they can look at the generated
code for x86 (especially when cmov isn't used).
Link: https://lkml.kernel.org/r/20251105201035.64043-4-david.laight.linux@gmail.com
Signed-off-by: David Laight <david.laight.linux@gmail.com>
Reviewed-by: Nicolas Pitre <npitre@baylibre.com>
Cc: Biju Das <biju.das.jz@bp.renesas.com>
Cc: Borislav Betkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Li RongQing <lirongqing@baidu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
David Laight [Wed, 5 Nov 2025 20:10:28 +0000 (20:10 +0000)]
lib: mul_u64_u64_div_u64(): combine overflow and divide by zero checks
Since the overflow check always triggers when the divisor is zero
move the check for divide by zero inside the overflow check.
This means there is only one test in the normal path.
Link: https://lkml.kernel.org/r/20251105201035.64043-3-david.laight.linux@gmail.com
Signed-off-by: David Laight <david.laight.linux@gmail.com>
Reviewed-by: Nicolas Pitre <npitre@baylibre.com>
Cc: Biju Das <biju.das.jz@bp.renesas.com>
Cc: Borislav Betkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Li RongQing <lirongqing@baidu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
David Laight [Wed, 5 Nov 2025 20:10:27 +0000 (20:10 +0000)]
lib: mul_u64_u64_div_u64(): rename parameter 'c' to 'd'
Patch series "Implement mul_u64_u64_div_u64_roundup()", v5.
The pwm-stm32.c code wants a 'rounding up' version of
mul_u64_u64_div_u64(). This can be done simply by adding 'divisor - 1' to
the 128bit product. Implement mul_u64_add_u64_div_u64(a, b, c, d) = (a *
b + c)/d based on the existing code. Define mul_u64_u64_div_u64(a, b, d)
as mul_u64_add_u64_div_u64(a, b, 0, d) and mul_u64_u64_div_u64_roundup(a,
b, d) as mul_u64_add_u64_div_u64(a, b, d-1, d).
Only x86-64 has an optimsed (asm) version of the function. That is
optimised to avoid the 'add c' when c is known to be zero. In all other
cases the extra code will be noise compared to the software divide code.
The test module has been updated to test mul_u64_u64_div_u64_roundup() and
also enhanced it to verify the C division code on x86-64 and the 32bit
division code on 64bit.
This patch (of 9):
Change to prototype from mul_u64_u64_div_u64(u64 a, u64 b, u64 c) to
mul_u64_u64_div_u64(u64 a, u64 b, u64 d). Using 'd' for 'divisor' makes
more sense.
An upcoming change adds a 'c' parameter to calculate (a * b + c)/d.
Link: https://lkml.kernel.org/r/20251105201035.64043-1-david.laight.linux@gmail.com
Link: https://lkml.kernel.org/r/20251105201035.64043-2-david.laight.linux@gmail.com
Signed-off-by: David Laight <david.laight.linux@gmail.com>
Reviewed-by: Nicolas Pitre <npitre@baylibre.com>
Cc: Biju Das <biju.das.jz@bp.renesas.com>
Cc: Borislav Betkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Li RongQing <lirongqing@baidu.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Christoph Hellwig [Tue, 4 Nov 2025 12:19:20 +0000 (07:19 -0500)]
kernel/hung_task: unexport sysctl_hung_task_timeout_secs
This was added by the bcachefs pull requests despite various
objections, and with bcachefs removed is now unused.
This reverts commit
5c3273ec3c6a ("kernel/hung_task.c: export
sysctl_hung_task_timeout_secs").
Link: https://lkml.kernel.org/r/20251104121920.2430568-1-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Andy Shevchenko [Tue, 4 Nov 2025 18:38:34 +0000 (19:38 +0100)]
util_macros.h: fix kernel-doc for u64_to_user_ptr()
The added documentation to u64_to_user_ptr() misspelled the function name.
Fix it.
Link: https://lkml.kernel.org/r/20251104183834.1046584-1-andriy.shevchenko@linux.intel.com
Fixes:
029c896c4105 ("kernel.h: move PTR_IF() and u64_to_user_ptr() to util_macros.h")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Alexandru Ardelean <aardelean@baylibre.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Carlos López [Fri, 31 Oct 2025 11:19:09 +0000 (12:19 +0100)]
checkpatch: add IDR to the deprecated list
As of commit
85656ec193e9, the IDR interface is marked as deprecated in
the documentation, but no checks are made in that regard for new code.
Add the existing IDR initialization APIs to the deprecated list in
checkpatch, so that if new code is introduced using these APIs, a warning
is emitted.
Link: https://lkml.kernel.org/r/20251031111908.2266077-2-clopez@suse.de
Signed-off-by: Carlos López <clopez@suse.de>
Suggested-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Joe Perches <joe@perches.com>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: Dwaipayan Ray <dwaipayanray1@gmail.com>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Borislav Petkov (AMD) [Wed, 29 Oct 2025 12:27:43 +0000 (13:27 +0100)]
lib/Kconfig.debug: cleanup CONFIG_DEBUG_SECTION_MISMATCH help text
Simplify formulations, correct flow, split it into proper paragraphs and
update structure.
No functional changes.
Link: https://lkml.kernel.org/r/20251029122743.1110-1-bp@kernel.org
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Deepanshu Kartikey [Thu, 30 Oct 2025 15:30:03 +0000 (18:30 +0300)]
ocfs2: validate cl_bpc in allocator inodes to prevent divide-by-zero
The chain allocator field cl_bpc (blocks per cluster) is read from disk
and used in division operations without validation. A corrupted
filesystem image with cl_bpc=0 causes a divide-by-zero crash in the
kernel:
divide error: 0000 [#1] PREEMPT SMP KASAN
RIP: 0010:ocfs2_bg_discontig_add_extent fs/ocfs2/suballoc.c:335 [inline]
RIP: 0010:ocfs2_block_group_fill+0x5bd/0xa70 fs/ocfs2/suballoc.c:386
Call Trace:
ocfs2_block_group_alloc+0x7e9/0x1330 fs/ocfs2/suballoc.c:703
ocfs2_reserve_suballoc_bits+0x20a6/0x4640 fs/ocfs2/suballoc.c:834
ocfs2_reserve_new_inode+0x4f4/0xcc0 fs/ocfs2/suballoc.c:1074
ocfs2_mknod+0x83c/0x2050 fs/ocfs2/namei.c:306
This patch adds validation in ocfs2_validate_inode_block() to ensure
cl_bpc matches the expected value calculated from the superblock's cluster
size and block size for chain allocator inodes (identified by
OCFS2_CHAIN_FL).
Moving the validation to inode validation time (rather than allocation time)
has several benefits:
- Validates once when the inode is read, rather than on every allocation
- Protects all code paths that use cl_bpc (allocation, resize, etc.)
- Follows the existing pattern of inode validation in OCFS2
- Centralizes validation logic
The validation catches both:
- Zero values that cause divide-by-zero crashes
- Non-zero but incorrect values indicating filesystem corruption or
mismatched filesystem geometry
With this fix, mounting a corrupted filesystem produces:
OCFS2: ERROR (device loop0): ocfs2_validate_inode_block: Inode 74
has corrupted cl_bpc: ondisk=0 expected=16
instead of a kernel crash.
[dmantipov@yandex.ru: combine into the series and tweak the message to fit the commonly used style]
Link: https://lkml.kernel.org/r/20251030153003.1934585-2-dmantipov@yandex.ru
Link: https://lore.kernel.org/ocfs2-devel/20251026132625.12348-1-kartikey406@gmail.com/T/#u
Link: https://lore.kernel.org/all/20251027124131.10002-1-kartikey406@gmail.com/T/
Signed-off-by: Deepanshu Kartikey <kartikey406@gmail.com>
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Reported-by: syzbot+fd8af97c7227fe605d95@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=
fd8af97c7227fe605d95
Tested-by: syzbot+fd8af97c7227fe605d95@syzkaller.appspotmail.com
Suggested-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Heming Zhao <heming.zhao@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Jun Piao <piaojun@huawei.com>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Mark Fasheh <mark@fasheh.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Dmitry Antipov [Thu, 30 Oct 2025 15:30:02 +0000 (18:30 +0300)]
ocfs2: add extra consistency checks for chain allocator dinodes
When validating chain allocator dinode in 'ocfs2_validate_inode_block()',
add an extra checks whether a) the maximum amount of chain records in
'struct ocfs2_chain_list' matches the value calculated based on the
filesystem block size, and b) the next free slot index is within the valid
range.
Link: https://lkml.kernel.org/r/20251030153003.1934585-1-dmantipov@yandex.ru
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Reported-by: syzbot+77026564530dbc29b854@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=
77026564530dbc29b854
Reported-by: syzbot+5054473a31f78f735416@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=
5054473a31f78f735416
Suggested-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Jun Piao <piaojun@huawei.com>
Cc: Deepanshu Kartikey <kartikey406@gmail.com>
Cc: Heming Zhao <heming.zhao@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Mark Fasheh <mark@fasheh.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Andy Shevchenko [Thu, 30 Oct 2025 11:44:22 +0000 (12:44 +0100)]
panic: sys_info: factor out read and write handlers
For the sake of the code readability and easier maintenance factor out
read and write sys_info handlers.
[akpm@linux-foundation.org: coding-style cleanups]
Link: https://lkml.kernel.org/r/20251030132007.3742368-7-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Cc: Feng Tang <feng.tang@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Andy Shevchenko [Thu, 30 Oct 2025 11:44:21 +0000 (12:44 +0100)]
panic: sys_info: deduplicate local variable 'table; assignments
The both handlers use the local 'table' variable and assign the same data
to it, deduplicate that.
Link: https://lkml.kernel.org/r/20251030132007.3742368-6-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Feng Tang <feng.tang@linux.alibaba.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Andy Shevchenko [Thu, 30 Oct 2025 11:44:20 +0000 (12:44 +0100)]
panic: sys_info: rewrite a fix for a compilation error (`make W=1`)
Compiler was not happy about dead variable in use:
lib/sys_info.c:52:19: error: variable 'sys_info_avail' is not needed and will not be emitted [-Werror,-Wunneeded-internal-declaration]
52 | static const char sys_info_avail[] = "tasks,mem,timers,locks,ftrace,all_bt,blocked_tasks";
| ^~~~~~~~~~~~~~
This was fixed by adding __maybe_unused attribute that just hides the
issue and didn't actually fix the root cause. Rewrite the fix by moving
the local variable from stack to a heap.
As a side effect this drops unneeded "synchronisation" of duplicative info
and also makes code ready for the further refactoring.
Link: https://lkml.kernel.org/r/20251030132007.3742368-5-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Cc: Feng Tang <feng.tang@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Andy Shevchenko [Thu, 30 Oct 2025 11:44:19 +0000 (12:44 +0100)]
panic: sys_info:replace struct sys_info_name with plain array of strings
There is no need to keep a custom structure just for the need of a plain
array of strings. Replace struct sys_info_name with plain array of
strings.
With that done, simplify the code, in particular, naturally use
for_each_set_bit() when iterating over si_bits_global bitmap.
Link: https://lkml.kernel.org/r/20251030132007.3742368-4-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Cc: Feng Tang <feng.tang@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Andy Shevchenko [Thu, 30 Oct 2025 11:44:18 +0000 (12:44 +0100)]
panic: sys_info: align constant definition names with parameters
Align constant definition names with parameters to make it easier to map.
It's also better to maintain and extend the names while keeping their
uniqueness.
Link: https://lkml.kernel.org/r/20251030132007.3742368-3-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Feng Tang <feng.tang@linux.alibaba.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Andy Shevchenko [Thu, 30 Oct 2025 11:44:17 +0000 (12:44 +0100)]
panic: sys_info: capture si_bits_global before iterating over it
Patch series "panic: sys_info: Refactor and fix a potential issue", v3.
While targeting the compilation issue due to dangling variable, I have
noticed more opportunities for refactoring that helps to avoid above
mentioned compilation issue in a cleaner way and also fixes a potential
problem with global variable access.
This patch (of 6):
The for-loop might re-read the content of the memory the si_bits_global
points to on each iteration. Instead, just capture it for the sake of
consistency and use that instead.
Link: https://lkml.kernel.org/r/20251030132007.3742368-1-andriy.shevchenko@linux.intel.com
Link: https://lkml.kernel.org/r/20251030132007.3742368-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Feng Tang <feng.tang@linux.alibaba.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Thorsten Blum [Thu, 30 Oct 2025 15:46:43 +0000 (00:46 +0900)]
nilfs2: replace vmalloc + copy_from_user with vmemdup_user
Replace vmalloc() followed by copy_from_user() with vmemdup_user() to
improve nilfs_ioctl_clean_segments() and nilfs_ioctl_set_suinfo(). Use
kvfree() to free the buffers created by vmemdup_user().
Use u64_to_user_ptr() instead of manually casting the pointers and
remove the obsolete 'out_free' label.
No functional changes intended.
Link: https://lkml.kernel.org/r/20251030154700.7444-1-konishi.ryusuke@gmail.com
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Hao Ge [Thu, 30 Oct 2025 12:17:46 +0000 (20:17 +0800)]
mailmap: add entry for Hao Ge
Use hao.ge@linux.dev as the main address for kernel work
Link: https://lkml.kernel.org/r/20251030121746.230747-1-hao.ge@linux.dev
Signed-off-by: Hao Ge <gehao@kylinos.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Oleg Nesterov [Sun, 26 Oct 2025 14:31:40 +0000 (15:31 +0100)]
release_task: kill unnecessary rcu_read_lock() around dec_rlimit_ucounts()
rcu_read_lock() was added to shut RCU-lockdep up when this code used
__task_cred()->rcu_dereference(), but after the commit
21d1c5e386bc
("Reimplement RLIMIT_NPROC on top of ucounts") it is no longer needed:
task_ucounts()->task_cred_xxx() takes rcu_read_lock() itself.
NOTE: task_ucounts() returns the pointer to another rcu-protected data,
struct ucounts. So it should either be used when task->real_cred and thus
task->real_cred->ucounts is stable (release_task, copy_process,
copy_creds), or it should be called under rcu_read_lock(). In both cases
it is pointless to take rcu_read_lock() to read the cred->ucounts pointer.
Link: https://lkml.kernel.org/r/20251026143140.GA22463@redhat.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Alexey Gladkov <legion@kernel.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Mateusz Guzik <mjguzik@gmail.com>
Cc: "Paul E . McKenney" <paulmck@kernel.org>
Cc: Kees Cook <kees@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Yu-Chun Lin [Mon, 27 Oct 2025 10:03:09 +0000 (18:03 +0800)]
mailmap: add entry for Yu-Chun Lin
Map my personal email to my business email.
Link: https://lkml.kernel.org/r/20251027100309.22035-1-eleanor.lin@realtek.com
Signed-off-by: Yu-Chun Lin <eleanor.lin@realtek.com>
Cc: Kuan-Wei Chiu <visitorckw@gmail.com>
Cc: Stanley Chang <stanley_chang@realtek.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Dr. David Alan Gilbert [Fri, 24 Oct 2025 20:51:20 +0000 (21:51 +0100)]
lib/xxhash: remove more unused xxh functions
xxh32_reset() and xxh32_copy_state() are unused, and with those gone, the
xxh32_state struct is also unused.
xxh64_copy_state() is also unused.
Remove them all.
(Also fixes a comment above the xxh64_state that referred to it as
xxh32_state).
Link: https://lkml.kernel.org/r/20251024205120.454508-1-linux@treblig.org
Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Suggested-by: Christoph Hellwig <hch@infradead.org>
Reviewed-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Ye Bin [Sat, 25 Oct 2025 08:00:03 +0000 (16:00 +0800)]
dynamic_debug: add support for print stack
In practical problem diagnosis, especially during the boot phase, it is
often desirable to know the call sequence. However, currently, apart from
adding print statements and recompiling the kernel, there seems to be no
good alternative. If dynamic_debug supported printing the call stack, it
would be very helpful for diagnosing issues. This patch add support '+d'
for dump stack.
Link: https://lkml.kernel.org/r/20251025080003.312536-1-yebin@huaweicloud.com
Signed-off-by: Ye Bin <yebin10@huawei.com>
Cc: Jason Baron <jbaron@akamai.com>
Cc: Jim Cromie <jim.cromie@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Dmitry Antipov [Thu, 23 Oct 2025 14:16:50 +0000 (17:16 +0300)]
ocfs2: add inline inode consistency check to ocfs2_validate_inode_block()
In 'ocfs2_validate_inode_block()', add an extra check whether an inode
with inline data (i.e. self-contained) has no clusters, thus preventing
an invalid inode from being passed to 'ocfs2_evict_inode()' and below.
Link: https://lkml.kernel.org/r/20251023141650.417129-1-dmantipov@yandex.ru
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Reported-by: syzbot+c16daba279a1161acfb0@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=
c16daba279a1161acfb0
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Joseph Qi <jiangqi903@gmail.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Jun Piao <piaojun@huawei.com>
Cc: Heming Zhao <heming.zhao@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Joseph Qi [Sat, 25 Oct 2025 12:32:18 +0000 (20:32 +0800)]
ocfs2: convert to host endian in ocfs2_validate_inode_block
Convert to host endian when checking OCFS2_VALID_FL to keep consistent
with other checks.
Link: https://lkml.kernel.org/r/20251025123218.3997866-2-joseph.qi@linux.alibaba.com
Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: Heming Zhao <heming.zhao@suse.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Jun Piao <piaojun@huawei.com>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Mark Fasheh <mark@fasheh.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Joseph Qi [Sat, 25 Oct 2025 12:32:17 +0000 (20:32 +0800)]
ocfs2: use correct endian in ocfs2_dinode_has_extents
Fields in ocfs2_dinode is little endian, covert to host endian when
checking those contents.
Link: https://lkml.kernel.org/r/20251025123218.3997866-1-joseph.qi@linux.alibaba.com
Fixes:
fdbb6cd96ed5 ("ocfs2: correct l_next_free_rec in online check")
Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: Heming Zhao <heming.zhao@suse.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Dmitry Antipov [Mon, 13 Oct 2025 06:28:26 +0000 (09:28 +0300)]
ocfs2: add boundary check to ocfs2_check_dir_entry()
In 'ocfs2_check_dir_entry()', add extra check whether at least the
smallest possible dirent may be located at the specified offset within
bh's data, thus preventing an out-of-bounds accesses below.
Link: https://lkml.kernel.org/r/20251013062826.122586-1-dmantipov@yandex.ru
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Reported-by: syzbot+b20bbf680bb0f2ecedae@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=
b20bbf680bb0f2ecedae
Reviewed-by: Heming Zhao <heming.zhao@suse.com>
Cc: Joseph Qi <jiangqi903@gmail.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Yury Norov (NVIDIA) [Thu, 23 Oct 2025 17:16:06 +0000 (13:16 -0400)]
uaccess: decouple INLINE_COPY_FROM_USER and CONFIG_RUST
Commit
1f9a8286bc0c ("uaccess: always export _copy_[from|to]_user with
CONFIG_RUST") exports _copy_{from,to}_user() unconditionally, if RUST is
enabled. This pollutes exported symbols namespace, and spreads RUST
ifdefery in core files.
It's better to declare a corresponding helper under the rust/helpers,
similarly to how non-underscored copy_{from,to}_user() is handled.
[yury.norov@gmail.com: drop rust part of comment for _copy_from_user(), per Alice]
Link: https://lkml.kernel.org/r/20251024154754.99768-1-yury.norov@gmail.com
Link: https://lkml.kernel.org/r/20251023171607.1171534-1-yury.norov@gmail.com
Signed-off-by: Yury Norov (NVIDIA) <yury.norov@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Tested-by: Alice Ryhl <aliceryhl@google.com>
Cc: Alex Gaynor <alex.gaynor@gmail.com>
Cc: Andreas Hindborg <a.hindborg@kernel.org>
Cc: Björn Roy Baron <bjorn3_gh@protonmail.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Danilo Krummrich <dakr@kernel.org>
Cc: Gary Guo <gary@garyguo.net>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Trevor Gross <tmgross@umich.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Douglas Anderson [Thu, 23 Oct 2025 18:33:05 +0000 (11:33 -0700)]
init/main.c: wrap long kernel cmdline when printing to logs
The kernel cmdline length is allowed to be longer than what printk can
handle. When this happens the cmdline that's printed to the kernel ring
buffer at bootup is cutoff and some kernel cmdline options are "hidden"
from the logs. This undercuts the usefulness of the log message.
Specifically, grepping for COMMAND_LINE_SIZE shows that 2048 is common and
some architectures even define it as 4096. s390 allows a CONFIG-based
maximum up to 1MB (though it's not expected that anyone will go over the
default max of 4096 [1]).
The maximum message pr_notice() seems to be able to handle (based on
experiment) is 1021 characters. This appears to be based on the current
value of PRINTKRB_RECORD_MAX as 1024 and the fact that pr_notice() spends
2 characters on the loglevel prefix and we have a '\n' at the end.
While it would be possible to increase the limits of printk() (and
therefore pr_notice()) somewhat, it doesn't appear possible to increase it
enough to fully include a 2048-character cmdline without breaking
userspace. Specifically on at least two tested userspaces (ChromeOS plus
the Debian-based distro I'm typing this message on) the `dmesg` tool reads
lines from `/dev/kmsg` in 2047-byte chunks. As per
`Documentation/ABI/testing/dev-kmsg`:
Every read() from the opened device node receives one record
of the kernel's printk buffer.
...
Messages in the record ring buffer get overwritten as whole,
there are never partial messages received by read().
We simply can't fit a 2048-byte cmdline plus the "Kernel command line:"
prefix plus info about time/log_level/etc in a 2047-byte read.
The above means that if we want to avoid the truncation we need to do some
type of wrapping of the cmdline when printing.
Add wrapping to the printout of the kernel command line. By default, the
wrapping is set to 1021 characters to avoid breaking anyone, but allow
wrapping to be set lower by a Kconfig knob
"CONFIG_CMDLINE_LOG_WRAP_IDEAL_LEN". Any tools that are correctly parsing
the cmdline today (because it is less than 1021 characters) will see no
difference in their behavior. The format of wrapped output is designed to
be matched by anyone using "grep" to search for the cmdline and also to be
easy for tools to handle. Anyone who is sure their tools (if any) handle
the wrapped format can choose a lower wrapping value and have prettier
output.
Setting CONFIG_CMDLINE_LOG_WRAP_IDEAL_LEN to 0 fully disables the wrapping
logic. This means that long command lines will be truncated again, but
this config could be set if command lines are expected to be long and
userspace is known not to handle parsing logs with the wrapping.
Wrapping is based on spaces, ignoring quotes. All lines are prefixed with
"Kernel command line: " and lines that are not the last line have a " \"
suffix added to them. The prefix and suffix count towards the line length
for wrapping purposes. The ideal length will be exceeded if no
appropriate place to wrap is found.
The wrapping function added here is fairly generic and could be made a
library function (somewhat like print_hex_dump()) if it's needed elsewhere
in the kernel. However, having printk() directly incorporate this
wrapping would be unlikely to be a good idea since it would break
printouts into more than one record without any obvious common line prefix
to tie lines together. It would also be extra overhead when, in general,
kernel log message should simply be kept smaller than 1021 bytes. For
some discussion on this topic, see responses to the v1 posting of this
patch [2].
[akpm@linux-foundation.org: make print_kernel_cmdline __init]
[dianders@chromium.org: v4]
Link: https://lkml.kernel.org/r/20251027082204.v4.1.I095f1e2c6c27f9f4de0b4841f725f356c643a13f@changeid
Link: https://lkml.kernel.org/r/20251023113257.v3.1.I095f1e2c6c27f9f4de0b4841f725f356c643a13f@changeid
Link: https://lore.kernel.org/r/20251021131633.26700Dd6-hca@linux.ibm.com
Link: https://lore.kernel.org/r/CAD=FV=VNyt1zG_8pS64wgV8VkZWiWJymnZ-XCfkrfaAhhFSKcA@mail.gmail.com
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrew Chant <achant@google.com>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Francesco Valla <francesco@valla.it>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: guoweikang <guoweikang.kernel@gmail.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jan Hendrik Farr <kernel@jfarr.cc>
Cc: Jeff Xu <jeffxu@chromium.org>
Cc: Kees Cook <kees@kernel.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Michal Koutný <mkoutny@suse.com>
Cc: Miguel Ojeda <ojeda@kernel.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Vlad Kulikov [Tue, 21 Oct 2025 18:13:39 +0000 (21:13 +0300)]
ipc: create_ipc_ns: drop mqueue mount on sysctl setup failure
If setup_mq_sysctls(ns) fails after mq_init_ns(ns) succeeds, the error
path skipped releasing the internal kernel mqueue mount kept in
ns->mq_mnt. That leaves the vfsmount/superblock referenced until final
namespace teardown, i.e. a resource leak on this rare failure edge.
Unwind it by calling mntput(ns->mq_mnt) before dropping user_ns and
freeing the IPC namespace. This mirrors the normal ordering used in
free_ipc_ns().
Link: https://lkml.kernel.org/r/20251021181341.670297-1-vlad_kulikov_c@pm.me
Signed-off-by: Vlad Kulikov <vlad_kulikov_c@pm.me>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Aleksa Sarai <cyphar@cyphar.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Ma Wupeng <mawupeng1@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Dmitry Antipov [Mon, 13 Oct 2025 10:37:09 +0000 (13:37 +0300)]
ocfs2: add directory size check to ocfs2_find_dir_space_id()
Fix a null-pointer-deref which was detected by UBSAN:
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 UID: 0 PID: 5317 Comm: syz-executor310 Not tainted
6.15.0-syzkaller-12141-gec7714e49479 #0 PREEMPT(full)
In 'ocfs2_find_dir_space_id()', add extra check whether the directory data
block is large enough to hold at least one directory entry, and raise
'ocfs2_error()' if the former is unexpectedly small.
Link: https://lkml.kernel.org/r/20251013103709.146001-1-dmantipov@yandex.ru
Reported-by: syzbot+ded9116588a7b73c34bc@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=
ded9116588a7b73c34bc
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Reviewed-by: Heming Zhao <heming.zhao@suse.com>
Cc: Joseph Qi <jiangqi903@gmail.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Petr Pavlu [Wed, 22 Oct 2025 08:28:04 +0000 (10:28 +0200)]
taint/module: remove unnecessary taint_flag.module field
The TAINT_RANDSTRUCT and TAINT_FWCTL flags are mistakenly set in the
taint_flags table as per-module flags. While this can be trivially
corrected, the issue can be avoided altogether by removing the
taint_flag.module field.
This is possible because, since commit
7fd8329ba502 ("taint/module: Clean
up global and module taint flags handling") in 2016, the handling of
module taint flags has been fully generic. Specifically,
module_flags_taint() can print all flags, and the required output buffer
size is properly defined in terms of TAINT_FLAGS_COUNT. The actual
per-module flags are always those added to module.taints by calls to
add_taint_module().
Link: https://lkml.kernel.org/r/20251022082938.26670-1-petr.pavlu@suse.com
Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
Acked-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Aaron Tomlin <atomlin@atomlin.com>
Cc: Luis Chamberalin <mcgrof@kernel.org>
Cc: Petr Pavlu <petr.pavlu@suse.com>
Cc: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Randy Dunlap [Wed, 15 Oct 2025 22:16:26 +0000 (15:16 -0700)]
taint: add reminder about updating docs and scripts
Sometimes people update taint-related pieces of the kernel without
updating the supporting documentation or scripts. Add a reminder to do
this.
Link: https://lkml.kernel.org/r/20251015221626.1126156-1-rdunlap@infradead.org
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Cc: David Gow <davidgow@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Sourabh Jain [Thu, 16 Oct 2025 14:28:31 +0000 (19:58 +0530)]
crash: let architecture decide crash memory export to iomem_resource
With the generic crashkernel reservation, the kernel emits the following
warning on powerpc:
WARNING: CPU: 0 PID: 1 at arch/powerpc/mm/mem.c:341 add_system_ram_resources+0xfc/0x180
Modules linked in:
CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted
6.17.0-auto-12607-g5472d60c129f #1 VOLUNTARY
Hardware name: IBM,9080-HEX Power11 (architected) 0x820200 0xf000007 of:IBM,FW1110.01 (NH1110_069) hv:phyp pSeries
NIP:
c00000000201de3c LR:
c00000000201de34 CTR:
0000000000000000
REGS:
c000000127cef8a0 TRAP: 0700 Not tainted (
6.17.0-auto-12607-g5472d60c129f)
MSR:
8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR:
84000840 XER:
20040010
CFAR:
c00000000017eed0 IRQMASK: 0
GPR00:
c00000000201de34 c000000127cefb40 c0000000016a8100 0000000000000001
GPR04:
c00000012005aa00 0000000020000000 c000000002b705c8 0000000000000000
GPR08:
000000007fffffff fffffffffffffff0 c000000002db8100 000000011fffffff
GPR12:
c00000000201dd40 c000000002ff0000 c0000000000112bc 0000000000000000
GPR16:
0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR20:
0000000000000000 0000000000000000 0000000000000000 c0000000015a3808
GPR24:
c00000000200468c c000000001699888 0000000000000106 c0000000020d1950
GPR28:
c0000000014683f8 0000000081000200 c0000000015c1868 c000000002b9f710
NIP [
c00000000201de3c] add_system_ram_resources+0xfc/0x180
LR [
c00000000201de34] add_system_ram_resources+0xf4/0x180
Call Trace:
add_system_ram_resources+0xf4/0x180 (unreliable)
do_one_initcall+0x60/0x36c
do_initcalls+0x120/0x220
kernel_init_freeable+0x23c/0x390
kernel_init+0x34/0x26c
ret_from_kernel_user_thread+0x14/0x1c
This warning occurs due to a conflict between crashkernel and System RAM
iomem resources.
The generic crashkernel reservation adds the crashkernel memory range to
/proc/iomem during early initialization. Later, all memblock ranges are
added to /proc/iomem as System RAM. If the crashkernel region overlaps
with any memblock range, it causes a conflict while adding those memblock
regions as iomem resources, triggering the above warning. The conflicting
memblock regions are then omitted from /proc/iomem.
For example, if the following crashkernel region is added to /proc/iomem:
20000000-
11fffffff : Crash kernel
then the following memblock regions System RAM regions fail to be inserted:
00000000-
7fffffff : System RAM
80000000-
257fffffff : System RAM
Fix this by not adding the crashkernel memory to /proc/iomem on powerpc.
Introduce an architecture hook to let each architecture decide whether to
export the crashkernel region to /proc/iomem.
For more info checkout commit
c40dd2f766440 ("powerpc: Add System RAM
to /proc/iomem") and commit
bce074bdbc36 ("powerpc: insert System RAM
resource to prevent crashkernel conflict")
Note: Before switching to the generic crashkernel reservation, powerpc
never exported the crashkernel region to /proc/iomem.
Link: https://lkml.kernel.org/r/20251016142831.144515-1-sourabhjain@linux.ibm.com
Fixes:
e3185ee438c2 ("powerpc/crash: use generic crashkernel reservation").
Signed-off-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Reported-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Closes: https://lore.kernel.org/all/
90937fe0-2e76-4c82-b27e-
7b8a7fe3ac69@linux.ibm.com/
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Cc: Baoquan he <bhe@redhat.com>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mahesh Salgaonkar <mahesh@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
WangYuli [Tue, 14 Oct 2025 05:07:47 +0000 (13:07 +0800)]
.mailmap: add entry for WangYuli
Map my old, obsolete work email address to my current email address.
My current work email may not be ideal for timely communication, as
it requires a secure network environment for access due to security
policies.
Therefore, associate both my previous and current work email addresses
with an email address provided to me by AOSC Linux community. During
work hours, my commits will likely still be authored using my company
email address.
Link: https://lkml.kernel.org/r/20251014050747.527357-1-wangyuli@aosc.io
Signed-off-by: WangYuli <wangyl5933@chinaunicom.cn>
Signed-off-by: WangYuli <wangyuli@aosc.io>
Cc: Carlos Bilbao <carlos.bilbao@kernel.org>
Cc: Jarkko Sakkinen <jarkko@kernel.org>
Cc: Shannon Nelson <sln@onemain.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Ankan Biswas [Tue, 14 Oct 2025 05:24:36 +0000 (10:54 +0530)]
lib/xz: remove dead IA-64 (Itanium) support code
Support for the IA-64 (Itanium) architecture was removed in commit
cf8e8658100d ("arch: Remove Itanium (IA-64) architecture").
This patch drops the IA-64 specific decompression code from lib/xz, which
was conditionally compiled with the now-obsolete CONFIG_XZ_DEC_IA64
option.
Link: https://lkml.kernel.org/r/20251014052738.31185-1-spyjetfayed@gmail.com
Signed-off-by: Ankan Biswas <spyjetfayed@gmail.com>
Reviewed-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Reviewed-by: Khalid Aziz <khalid@kernel.org>
Acked-by: Lasse Collin <lasse.collin@tukaani.org>
Cc: David Hunter <david.hunter.linux@gmail.com>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Li RongQing [Wed, 15 Oct 2025 06:36:15 +0000 (14:36 +0800)]
hung_task: panic when there are more than N hung tasks at the same time
The hung_task_panic sysctl is currently a blunt instrument: it's all or
nothing.
Panicking on a single hung task can be an overreaction to a transient
glitch. A more reliable indicator of a systemic problem is when
multiple tasks hang simultaneously.
Extend hung_task_panic to accept an integer threshold, allowing the
kernel to panic only when N hung tasks are detected in a single scan.
This provides finer control to distinguish between isolated incidents
and system-wide failures.
The accepted values are:
- 0: Don't panic (unchanged)
- 1: Panic on the first hung task (unchanged)
- N > 1: Panic after N hung tasks are detected in a single scan
The original behavior is preserved for values 0 and 1, maintaining full
backward compatibility.
[lance.yang@linux.dev: new changelog]
Link: https://lkml.kernel.org/r/20251015063615.2632-1-lirongqing@baidu.com
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Tested-by: Lance Yang <lance.yang@linux.dev>
Acked-by: Andrew Jeffery <andrew@codeconstruct.com.au> [aspeed_g5_defconfig]
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: David Hildenbrand <david@redhat.com>
Cc: Florian Wesphal <fw@strlen.de>
Cc: Jakub Kacinski <kuba@kernel.org>
Cc: Jason A. Donenfeld <jason@zx2c4.com>
Cc: Joel Granados <joel.granados@kernel.org>
Cc: Joel Stanley <joel@jms.id.au>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kees Cook <kees@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: "Paul E . McKenney" <paulmck@kernel.org>
Cc: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Phil Auld <pauld@redhat.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Simon Horman <horms@kernel.org>
Cc: Stanislav Fomichev <sdf@fomichev.me>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Thomas Weißschuh [Mon, 13 Oct 2025 09:12:02 +0000 (11:12 +0200)]
compiler.h: remove ARCH_SEL()
Its last user was removed in commit
8ea815399c3f ("compiler: remove
__ADDRESSABLE_ASM{_STR,}() again").
Link: https://lkml.kernel.org/r/20251013-arch-sel-v1-1-7eef9b22ceb0@linutronix.de
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Cc: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Dmitry Antipov [Tue, 7 Oct 2025 09:46:26 +0000 (12:46 +0300)]
ocfs2: add extra consistency check to ocfs2_dx_dir_lookup_rec()
In 'ocfs2_dx_dir_lookup_rec()', check whether an extent list length of the
directory indexing block matches the one configured via the superblock
parameters established at mount, thus preventing an out-of-bounds accesses
while iterating over the extent records below.
Link: https://lkml.kernel.org/r/20251007094626.196143-1-dmantipov@yandex.ru
Reported-by: syzbot+30b53487d00b4f7f0922@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=
30b53487d00b4f7f0922
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: Heming Zhao <heming.zhao@suse.com>>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Dmitry Antipov [Tue, 7 Oct 2025 12:35:26 +0000 (15:35 +0300)]
ocfs2: annotate flexible array members with __counted_by_le()
Annotate flexible array members of 'struct ocfs2_extent_list',
'struct ocfs2_chain_list', 'struct ocfs2_truncate_log',
'struct ocfs2_dx_entry_list', 'ocfs2_refcount_list' and
'struct ocfs2_xattr_header' with '__counted_by_le()'
attribute to improve array bounds checking when
CONFIG_UBSAN_BOUNDS is enabled.
[dmantipov@yandex.ru: fix __counted_by_le() usage in ocfs2_expand_inline_dx_root()]
Link: https://lkml.kernel.org/r/20251014070324.130313-1-dmantipov@yandex.ru
Link: https://lkml.kernel.org/r/20251007123526.213150-1-dmantipov@yandex.ru
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Reviewed-by: Heming Zhao <heming.zhao@suse.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Lukas Bulwahn [Fri, 10 Oct 2025 08:21:38 +0000 (10:21 +0200)]
treewide: drop outdated compiler version remarks in Kconfig help texts
As of writing, Documentation/Changes states the minimal versions of GNU C
being 8.1, Clang being 15.0.0 and binutils being 2.30. A few Kconfig help
texts are pointing out that specific GCC and Clang versions are needed,
but by now, those pointers to versions, such later than 4.0, later than
4.4, or clang later than 5.0, are obsolete and unlikely to be found by
users configuring their kernel builds anyway.
Drop these outdated remarks in Kconfig help texts referring to older
compiler and binutils versions. No functional change.
Link: https://lkml.kernel.org/r/20251010082138.185752-1-lukas.bulwahn@redhat.com
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@redhat.com>
Cc: Bill Wendling <morbo@google.com>
Cc: Justin Stitt <justinstitt@google.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Russel King <linux@armlinux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Martin Kepplinger-Novaković [Sat, 11 Oct 2025 15:59:39 +0000 (15:59 +0000)]
MAINTAINERS: apply name and email address changes for Martin
Update to new surname addition and currently used email address.
Link: https://lkml.kernel.org/r/20251011155903.7442-2-martink@posteo.de
Signed-off-by: Martin Kepplinger-Novaković <martink@posteo.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Martin Kepplinger-Novaković [Sat, 11 Oct 2025 15:59:39 +0000 (15:59 +0000)]
CREDITS: update Martin's information
Surname, address, email and the description changed. Apply these updates.
Link: https://lkml.kernel.org/r/20251011155903.7442-3-martink@posteo.de
Signed-off-by: Martin Kepplinger-Novaković <martink@posteo.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Martin Kepplinger-Novaković [Sat, 11 Oct 2025 15:59:39 +0000 (15:59 +0000)]
mailmap: update name and email addresses
Apply my new surname, remove unused and update to currently used email
addresses.
Link: https://lkml.kernel.org/r/20251011155903.7442-1-martink@posteo.de
Signed-off-by: Martin Kepplinger-Novaković <martink@posteo.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Zhichi Lin [Sat, 11 Oct 2025 08:22:22 +0000 (16:22 +0800)]
scs: fix a wrong parameter in __scs_magic
__scs_magic() needs a 'void *' variable, but a 'struct task_struct *' is
given. 'task_scs(tsk)' is the starting address of the task's shadow call
stack, and '__scs_magic(task_scs(tsk))' is the end address of the task's
shadow call stack. Here should be '__scs_magic(task_scs(tsk))'.
The user-visible effect of this bug is that when CONFIG_DEBUG_STACK_USAGE
is enabled, the shadow call stack usage checking function
(scs_check_usage) would scan an incorrect memory range. This could lead
to:
1. **Inaccurate stack usage reporting**: The function would calculate
wrong usage statistics for the shadow call stack, potentially showing
incorrect value in kmsg.
2. **Potential kernel crash**: If the value of __scs_magic(tsk)is
greater than that of __scs_magic(task_scs(tsk)), the for loop may
access unmapped memory, potentially causing a kernel panic. However,
this scenario is unlikely because task_struct is allocated via the slab
allocator (which typically returns lower addresses), while the shadow
call stack returned by task_scs(tsk) is allocated via vmalloc(which
typically returns higher addresses).
However, since this is purely a debugging feature
(CONFIG_DEBUG_STACK_USAGE), normal production systems should be not
unaffected. The bug only impacts developers and testers who are actively
debugging stack usage with this configuration enabled.
Link: https://lkml.kernel.org/r/20251011082222.12965-1-zhichi.lin@vivo.com
Fixes:
5bbaf9d1fcb9 ("scs: Add support for stack usage debugging")
Signed-off-by: Jiyuan Xie <xiejiyuan@vivo.com>
Signed-off-by: Zhichi Lin <zhichi.lin@vivo.com>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Acked-by: Will Deacon <will@kernel.org>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Marco Elver <elver@google.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yee Lee <yee.lee@mediatek.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Justinien Bouron [Mon, 29 Sep 2025 16:02:20 +0000 (09:02 -0700)]
kexec_core: remove superfluous page offset handling in segment loading
During kexec_segment loading, when copying the content of the segment
(i.e. kexec_segment::kbuf or kexec_segment::buf) to its associated pages,
kimage_load_{cma,normal,crash}_segment handle the case where the physical
address of the segment is not page aligned, e.g. in
kimage_load_normal_segment:
page = kimage_alloc_page(image, GFP_HIGHUSER, maddr);
// ...
ptr = kmap_local_page(page);
// ...
ptr += maddr & ~PAGE_MASK;
mchunk = min_t(size_t, mbytes,
PAGE_SIZE - (maddr & ~PAGE_MASK));
// ^^^^ Non page-aligned segments handled here ^^^
// ...
if (image->file_mode)
memcpy(ptr, kbuf, uchunk);
else
result = copy_from_user(ptr, buf, uchunk);
(similar logic is present in kimage_load_{cma,crash}_segment).
This is actually not needed because, prior to their loading, all
kexec_segments first go through a vetting step in
`sanity_check_segment_list`, which rejects any segment that is not
page-aligned:
for (i = 0; i < nr_segments; i++) {
unsigned long mstart, mend;
mstart = image->segment[i].mem;
mend = mstart + image->segment[i].memsz;
// ...
if ((mstart & ~PAGE_MASK) || (mend & ~PAGE_MASK))
return -EADDRNOTAVAIL;
// ...
}
In case `sanity_check_segment_list` finds a non-page aligned the whole
kexec load is aborted and no segment is loaded.
This means that `kimage_load_{cma,normal,crash}_segment` never actually
have to handle non page-aligned segments and `(maddr & ~PAGE_MASK) == 0`
is always true no matter if the segment is coming from a file (i.e.
`kexec_file_load` syscall), from a user-space buffer (i.e. `kexec_load`
syscall) or created by the kernel through `kexec_add_buffer`. In the
latter case, `kexec_add_buffer` actually enforces the page alignment:
/* Ensure minimum alignment needed for segments. */
kbuf->memsz = ALIGN(kbuf->memsz, PAGE_SIZE);
kbuf->buf_align = max(kbuf->buf_align, PAGE_SIZE);
[jbouron@amazon.com: v3]
Link: https://lkml.kernel.org/r/20251024155009.39502-1-jbouron@amazon.com
Link: https://lkml.kernel.org/r/20250929160220.47616-1-jbouron@amazon.com
Signed-off-by: Justinien Bouron <jbouron@amazon.com>
Reviewed-by: Gunnar Kudrjavets <gunnarku@amazon.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: Alexander Graf <graf@amazon.com>
Cc: Marcos Paulo de Souza <mpdesouza@suse.com>
Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Yan Zhao <yan.y.zhao@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Dmitry Antipov [Thu, 9 Oct 2025 10:23:49 +0000 (13:23 +0300)]
ocfs2: relax BUG() to ocfs2_error() in __ocfs2_move_extent()
In '__ocfs2_move_extent()', relax 'BUG()' to 'ocfs2_error()' just
to avoid crashing the whole kernel due to a filesystem corruption.
Fixes:
8f603e567aa7 ("Ocfs2/move_extents: move a range of extent.")
Link: https://lkml.kernel.org/r/20251009102349.181126-2-dmantipov@yandex.ru
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Closes: https://syzkaller.appspot.com/bug?extid=
727d161855d11d81e411
Reported-by: syzbot+727d161855d11d81e411@syzkaller.appspotmail.com
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Dmitry Antipov [Thu, 9 Oct 2025 10:23:48 +0000 (13:23 +0300)]
ocfs2: add extra flags check in ocfs2_ioctl_move_extents()
In 'ocfs2_ioctl_move_extents()', add extra check whether only actually
supported flags are passed via 'ioctl(..., OCFS2_IOC_MOVE_EXT, ...)',
and reject anything beyond OCFS2_MOVE_EXT_FL_AUTO_DEFRAG and
OCFS2_MOVE_EXT_FL_PART_DEFRAG with -EINVAL. In particular,
OCFS2_MOVE_EXT_FL_COMPLETE may be set by the kernel only and
should never be passed from userspace.
Link: https://lkml.kernel.org/r/20251009102349.181126-1-dmantipov@yandex.ru
Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Jun Piao <piaojun@huawei.com>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Mark Fasheh <mark@fasheh.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Onur Özkan [Wed, 17 Sep 2025 17:37:25 +0000 (20:37 +0300)]
checkpatch: document new check PLACEHOLDER_USE
Adds documentation for the new check PLACEHOLDER_USE in checkpatch.
Link: https://lkml.kernel.org/r/20250917173725.22547-3-work@onurozkan.dev
Signed-off-by: Onur Özkan <work@onurozkan.dev>
Acked-by: Joe Perches <joe@perches.com>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: Dwaipayan Ray <dwaipayanray1@gmail.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Onur Özkan [Wed, 17 Sep 2025 17:37:24 +0000 (20:37 +0300)]
checkpatch: detect unhandled placeholders in cover letters
Add a new check PLACEHOLDER_USE to detect unhandled placeholders. This
prevents sending patch series with incomplete patches (mostly in cover
letters) containing auto generated subject or blurb lines.
These placeholders can be seen on mailing lists. With this change,
checkpatch will emit an error when such text is found.
Link: https://lkml.kernel.org/r/20250917173725.22547-2-work@onurozkan.dev
Signed-off-by: Onur Özkan <work@onurozkan.dev>
Acked-by: Joe Perches <joe@perches.com>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: Dwaipayan Ray <dwaipayanray1@gmail.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Zhou Yuhang [Mon, 29 Sep 2025 06:24:34 +0000 (14:24 +0800)]
samples: fix coding style issues in Kconfig
Fix some coding style issues in Kconfig: use one tab to indent lines under
a config definition, and use an additional two spaces to indent help text.
Link: https://lkml.kernel.org/r/20250929062434.4114607-1-zhouyuhang1010@163.com
Signed-off-by: Zhou Yuhang <zhouyuhang@kylinos.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Linus Torvalds [Sun, 9 Nov 2025 23:10:19 +0000 (15:10 -0800)]
Linux 6.18-rc5
Linus Torvalds [Sun, 9 Nov 2025 17:29:44 +0000 (09:29 -0800)]
Merge tag 'i2c-for-6.18-rc5' of git://git./linux/kernel/git/wsa/linux
Pull i2c fix from Wolfram Sang:
"Two reverts merged into one commit to handle a regression caused by a
wrong cleanup because the underlying implications were unclear"
* tag 'i2c-for-6.18-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
i2c: muxes: pca954x: Fix broken reset-gpio usage
Linus Torvalds [Sun, 9 Nov 2025 17:22:08 +0000 (09:22 -0800)]
Merge tag 'kbuild-fixes-6.18-3' of git://git./linux/kernel/git/kbuild/linux
Pull Kbuild fixes from Nathan Chancellor:
- Strip trailing padding bytes from modules.builtin.modinfo to fix
error during modules_install with certain versions of kmod
- Drop unused static inline function warning in .c files with clang
from W=1 to W=2
- Ensure kernel-doc.py invocations use the PYTHON3 make variable to
ensure user's choice of Python interpreter is always respected
* tag 'kbuild-fixes-6.18-3' of git://git.kernel.org/pub/scm/linux/kernel/git/kbuild/linux:
kbuild: Let kernel-doc.py use PYTHON3 override
compiler_types: Move unused static inline functions warning to W=2
kbuild: Strip trailing padding bytes from modules.builtin.modinfo
Jean Delvare [Fri, 7 Nov 2025 18:29:33 +0000 (19:29 +0100)]
kbuild: Let kernel-doc.py use PYTHON3 override
It is possible to force a specific version of python to be used when
building the kernel by passing PYTHON3= on the make command line.
However kernel-doc.py is currently called with python3 hard-coded and
thus ignores this setting.
Use $(PYTHON3) to run $(KERNELDOC) so that the desired version of
python is used.
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Nicolas Schier <nsc@kernel.org>
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://patch.msgid.link/20251107192933.2bfe9e57@endymion
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Linus Torvalds [Sat, 8 Nov 2025 23:37:03 +0000 (15:37 -0800)]
Merge tag 'drm-fixes-2025-11-09' of https://gitlab.freedesktop.org/drm/kernel
Pull drm fix from Dave Airlie:
"Brown paper bag, the dma mask fix which I applied and actually looked
through for bad things, actually broke newer GPUs, there might be some
latent part in the boot path that is assuming 32-bit still, but we
will figure that out elsewhere.
nouveau:
- revert DMA mask change"
* tag 'drm-fixes-2025-11-09' of https://gitlab.freedesktop.org/drm/kernel:
Revert "drm/nouveau: set DMA mask before creating the flush page"
Linus Torvalds [Sat, 8 Nov 2025 23:34:23 +0000 (15:34 -0800)]
Merge tag 'rtc-6.18-fixes' of git://git./linux/kernel/git/abelloni/linux
Pull RTC fixes from Alexandre Belloni:
"The two reverts are for patches that I shouldn't have applied. The
rx8025 patch fixes an issue present since 2022:
- cpcap, tps6586x: revert incorrect irq enable/disable balance fix
- rx8025: fix incorrect register reference"
* tag 'rtc-6.18-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux:
rtc: rx8025: fix incorrect register reference
Revert "rtc: cpcap: Fix initial enable_irq/disable_irq balance"
Revert "rtc: tps6586x: Fix initial enable_irq/disable_irq balance"
Yuta Hayama [Wed, 15 Oct 2025 03:07:05 +0000 (12:07 +0900)]
rtc: rx8025: fix incorrect register reference
This code is intended to operate on the CTRL1 register, but ctrl[1] is
actually CTRL2. Correctly, ctrl[0] is CTRL1.
Signed-off-by: Yuta Hayama <hayama@lineo.co.jp>
Fixes:
71af91565052 ("rtc: rx8025: fix 12/24 hour mode detection on RX-8035")
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/eae5f479-5d28-4a37-859d-d54794e7628c@lineo.co.jp
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Linus Torvalds [Sat, 8 Nov 2025 18:17:30 +0000 (10:17 -0800)]
Merge tag 'v6.18rc4-SMB-client-fixes' of git://git.samba.org/sfrench/cifs-2.6
Pull smb client fixes from Steve French:
- Fix change notify packet validation check
- Refcount fix (e.g. rename error paths)
- Fix potential UAF due to missing locks on directory lease refcount
* tag 'v6.18rc4-SMB-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
smb: client: validate change notify buffer before copy
smb: client: fix refcount leak in smb2_set_path_attr
smb: client: fix potential UAF in smb2_close_cached_fid()
Linus Torvalds [Sat, 8 Nov 2025 17:01:11 +0000 (09:01 -0800)]
Merge tag 'x86-urgent-2025-11-08' of git://git./linux/kernel/git/tip/tip
Pull x86 fixes from Ingo Molnar:
- Fix AMD PCI root device caching regression that triggers
on certain firmware variants
- Fix the zen5_rdseed_microcode[] array to be NULL-terminated
- Add more AMD models to microcode signature checking
* tag 'x86-urgent-2025-11-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/microcode/AMD: Add more known models to entry sign checking
x86/CPU/AMD: Add missing terminator for zen5_rdseed_microcode
x86/amd_node: Fix AMD root device caching
Linus Torvalds [Sat, 8 Nov 2025 16:59:05 +0000 (08:59 -0800)]
Merge tag 'sched-urgent-2025-11-08' of git://git./linux/kernel/git/tip/tip
Pull scheduler fix from Ingo Molnar:
"Fix a group-throttling bug in the fair scheduler"
* tag 'sched-urgent-2025-11-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
sched/fair: Prevent cfs_rq from being unthrottled with zero runtime_remaining
Linus Torvalds [Sat, 8 Nov 2025 16:54:13 +0000 (08:54 -0800)]
Merge tag 'perf-urgent-2025-11-08' of git://git./linux/kernel/git/tip/tip
Pull perf event fix from Ingo Molnar:
"Fix a system hang caused by cpu-clock events deadlock"
* tag 'perf-urgent-2025-11-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/core: Fix system hang caused by cpu-clock usage
Linus Torvalds [Sat, 8 Nov 2025 16:51:22 +0000 (08:51 -0800)]
Merge tag 'locking-urgent-2025-11-08' of git://git./linux/kernel/git/tip/tip
Pull locking fix from Ingo Molnar:
"Fix (well, cut in half) a futex performance regression on PowerPC"
* tag 'locking-urgent-2025-11-08' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
futex: Optimize per-cpu reference counting
Linus Torvalds [Sat, 8 Nov 2025 16:47:31 +0000 (08:47 -0800)]
Merge tag 'io_uring-6.18-
20251107' of git://git./linux/kernel/git/axboe/linux
Pull io_uring fix from Jens Axboe:
"Single fix in there, fixing an overflow in calculating the needed
segments for converting into a bvec array"
* tag 'io_uring-6.18-
20251107' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux:
io_uring: fix regbuf vector size truncation
Linus Torvalds [Sat, 8 Nov 2025 16:43:01 +0000 (08:43 -0800)]
Merge tag 'xfs-fixes-6.18-rc5' of git://git./fs/xfs/xfs-linux
Pull xfs fixes from Carlos Maiolino:
"This contain fixes for the RT and zoned allocator, and a few fixes for
atomic writes"
* tag 'xfs-fixes-6.18-rc5' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
xfs: free xfs_busy_extents structure when no RT extents are queued
xfs: fix zone selection in xfs_select_open_zone_mru
xfs: fix a rtgroup leak when xfs_init_zone fails
xfs: fix various problems in xfs_atomic_write_cow_iomap_begin
xfs: fix delalloc write failures in software-provided atomic writes
Dave Airlie [Sat, 8 Nov 2025 09:41:09 +0000 (19:41 +1000)]
Revert "drm/nouveau: set DMA mask before creating the flush page"
This reverts commit
ebe755605082eddff80eafe0c50915b1366ee98f.
Tested the latest kernel on my GB203 and this seems to break it somehow.
Nov 09 04:16:14 bighp kernel: nouveau 0000:02:00.0: gsp: GSP-FMC boot failed (mbox: 0x0000000b)
Nov 09 04:16:14 bighp kernel: nouveau 0000:02:00.0: gsp: init failed, -5
Nov 09 04:16:14 bighp kernel: nouveau 0000:02:00.0: init failed with -5
Nov 09 04:16:14 bighp kernel: nouveau: drm:
00000000:
00000080: init failed with -5
Nov 09 04:16:14 bighp kernel: nouveau 0000:02:00.0: drm: Device allocation failed: -5
Nov 09 04:16:14 bighp kernel: nouveau 0000:02:00.0: probe with driver nouveau failed with error -5
Not sure why, I went over the patch and thought it should have worked, but there must be some
32-bit problem maybe in the FMC boot path.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Pavel Begunkov [Fri, 7 Nov 2025 18:41:26 +0000 (18:41 +0000)]
io_uring: fix regbuf vector size truncation
There is a report of io_estimate_bvec_size() truncating the calculated
number of segments that leads to corruption issues. Check it doesn't
overflow "int"s used later. Rough but simple, can be improved on top.
Cc: stable@vger.kernel.org
Fixes:
9ef4cbbcb4ac3 ("io_uring: add infra for importing vectored reg buffers")
Reported-by: Google Big Sleep <big-sleep-vuln-reports+bigsleep-458654612@google.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Reviewed-by: Günther Noack <gnoack@google.com>
Tested-by: Günther Noack <gnoack@google.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Linus Torvalds [Fri, 7 Nov 2025 22:51:11 +0000 (14:51 -0800)]
Merge tag 'drm-fixes-2025-11-08' of https://gitlab.freedesktop.org/drm/kernel
Pull drm fixes from Dave Airlie:
"Back from travel, thanks to Simona for handling things. regular fixes,
seems about the right size, but spread out a bit.
amdgpu has the usual range of fixes, xe has a few fixes, and nouveau
has a couple of fixes, one for blackwell modifiers on 8/16 bit
surfaces.
Otherwise a few small fixes for mediatek, sched, imagination and
pixpaper.
sched:
- Fix deadlock
amdgpu:
- Reset fixes
- Misc fixes
- Panel scaling fixes
- HDMI fix
- S0ix fixes
- Hibernation fix
- Secure display fix
- Suspend fix
- MST fix
amdkfd:
- Process cleanup fix
xe:
- Fix missing synchronization on unbind
- Fix device shutdown when doing FLR
- Fix user fence signaling order
i915:
- Avoid lock inversion when pinning to GGTT on CHV/BXT+VTD
- Fix conversion between clock ticks and nanoseconds
mediatek:
- Disable AFBC support on Mediatek DRM driver
- Add pm_runtime support for GCE power control
imagination:
- kconfig: Fix dependencies
nouveau:
- Set DMA mask earlier
- Advertize correct modifiers for GB20x
pixpaper:
- kconfig: Fix dependencies"
* tag 'drm-fixes-2025-11-08' of https://gitlab.freedesktop.org/drm/kernel: (26 commits)
drm/xe: Enforce correct user fence signaling order using
drm/xe: Do clean shutdown also when using flr
drm/xe: Move declarations under conditional branch
drm/xe/guc: Synchronize Dead CT worker with unbind
drm/amd/display: Enable mst when it's detected but yet to be initialized
drm/amdgpu: Fix wait after reset sequence in S3
drm/amd: Fix suspend failure with secure display TA
drm/amdgpu: fix gpu page fault after hibernation on PF passthrough
drm/tiny: pixpaper: add explicit dependency on MMU
drm/nouveau: Advertise correct modifiers on GB20x
drm: define NVIDIA DRM format modifiers for GB20x
drm/nouveau: set DMA mask before creating the flush page
drm/sched: Fix deadlock in drm_sched_entity_kill_jobs_cb
drm/amd/display: Fix NULL deref in debugfs odm_combine_segments
drm/amdkfd: Don't clear PT after process killed
drm/amdgpu/smu: Handle S0ix for vangogh
drm/amdgpu: Drop PMFW RLC notifier from amdgpu_device_suspend()
drm/amd/display: Fix black screen with HDMI outputs
drm/amd/display: Don't stretch non-native images by default in eDP
drm/amd/pm: fix missing device_attr cleanup in amdgpu_pm_sysfs_init()
...
Dave Airlie [Fri, 7 Nov 2025 21:39:11 +0000 (07:39 +1000)]
Merge tag 'drm-xe-fixes-2025-11-07' of https://gitlab.freedesktop.org/drm/xe/kernel into drm-fixes
Driver Changes:
- Fix missing synchronization on unbind (Balasubramani Vivekanandan)
- Fix device shutdown when doing FLR (Jouni Högander)
- Fix user fence signaling order (Matthew Brost)
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patch.msgid.link/mvfyflloncy76a7nmkatpj6f2afddavwsibz3y4u4wo6gznro5@rdulkuh5wvje
Linus Torvalds [Fri, 7 Nov 2025 21:19:18 +0000 (13:19 -0800)]
Merge tag 'parisc-for-6.18-rc5' of git://git./linux/kernel/git/deller/parisc-linux
Pull parisc fix from Helge Deller:
- fix crash triggered by unaligned access in parisc unwinder
* tag 'parisc-for-6.18-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
parisc: Avoid crash due to unaligned access in unwinder
Linus Torvalds [Fri, 7 Nov 2025 21:13:09 +0000 (13:13 -0800)]
Merge tag 'for-linus-iommufd' of git://git./linux/kernel/git/jgg/iommufd
Pull iommufd fixes from Jason Gunthorpe:
- Syzkaller found a case where maths overflows can cause divide by 0
- Typo in a compiler bug warning fix in the selftests broke the
selftests
- type1 compatability had a mismatch when unmapping an already unmapped
range, it should succeed
* tag 'for-linus-iommufd' of git://git.kernel.org/pub/scm/linux/kernel/git/jgg/iommufd:
iommufd: Make vfio_compat's unmap succeed if the range is already empty
iommufd/selftest: Fix ioctl return value in _test_cmd_trigger_vevents()
iommufd: Don't overflow during division for dirty tracking
Peter Zijlstra [Thu, 6 Nov 2025 10:50:00 +0000 (11:50 +0100)]
compiler_types: Move unused static inline functions warning to W=2
Per Nathan, clang catches unused "static inline" functions in C files
since commit
6863f5643dd7 ("kbuild: allow Clang to find unused static
inline functions for W=1 build").
Linus said:
> So I entirely ignore W=1 issues, because I think so many of the extra
> warnings are bogus.
>
> But if this one in particular is causing more problems than most -
> some teams do seem to use W=1 as part of their test builds - it's fine
> to send me a patch that just moves bad warnings to W=2.
>
> And if anybody uses W=2 for their test builds, that's THEIR problem..
Here is the change to bump the warning from W=1 to W=2.
Fixes:
6863f5643dd7 ("kbuild: allow Clang to find unused static inline functions for W=1 build")
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20251106105000.2103276-1-andriy.shevchenko@linux.intel.com
[nathan: Adjust comment as well]
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Joshua Rogers [Thu, 6 Nov 2025 16:09:37 +0000 (00:09 +0800)]
smb: client: validate change notify buffer before copy
SMB2_change_notify called smb2_validate_iov() but ignored the return
code, then kmemdup()ed using server provided OutputBufferOffset/Length.
Check the return of smb2_validate_iov() and bail out on error.
Discovered with help from the ZeroPath security tooling.
Signed-off-by: Joshua Rogers <linux@joshua.hu>
Reviewed-by: Paulo Alcantara (Red Hat) <pc@manguebit.org>
Cc: stable@vger.kernel.org
Fixes:
e3e9463414f61 ("smb3: improve SMB3 change notification support")
Signed-off-by: Steve French <stfrench@microsoft.com>
Linus Torvalds [Fri, 7 Nov 2025 16:10:55 +0000 (08:10 -0800)]
Merge tag 'gpio-fixes-for-v6.18-rc5' of git://git./linux/kernel/git/brgl/linux
Pull gpio fixes from Bartosz Golaszewski:
- use the firmware node of the GPIO chip, not its label for software
node lookup
- fix invalid pointer access in GPIO debugfs
- drop unused functions from gpio-tb10x
- fix a regression in gpio-aggregator: restore the set_config()
callback in the driver
- correct schema $id path in ti,twl4030 DT bindings
* tag 'gpio-fixes-for-v6.18-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
gpio: tb10x: Drop unused tb10x_set_bits() function
gpio: aggregator: restore the set_config operation
gpiolib: fix invalid pointer access in debugfs
gpio: swnode: don't use the swnode's name as the key for GPIO lookup
dt-bindings: gpio: ti,twl4030: Correct the schema $id path
Linus Torvalds [Fri, 7 Nov 2025 16:07:11 +0000 (08:07 -0800)]
Merge tag 'trace-v6.18-rc4' of git://git./linux/kernel/git/trace/linux-trace
Pull tracing fixes from Steven Rostedt:
- Check for reader catching up in ring_buffer_map_get_reader()
If the reader catches up to the writer in the memory mapped ring
buffer then calling rb_get_reader_page() will return NULL as there's
no pages left. But this isn't checked for before calling
rb_get_reader_page() and the return of NULL causes a warning.
If it is detected that the reader caught up to the writer, then
simply exit the routine
- Fix memory leak in histogram create_field_var()
The couple of the error paths in create_field_var() did not properly
clean up what was allocated. Make sure everything is freed properly
on error
- Fix help message of tools latency_collector
The help message incorrectly stated that "-t" was the same as
"--threads" whereas "--threads" is actually represented by "-e"
* tag 'trace-v6.18-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
tracing/tools: Fix incorrcet short option in usage text for --threads
tracing: Fix memory leaks in create_field_var()
ring-buffer: Do not warn in ring_buffer_map_get_reader() when reader catches up
Linus Torvalds [Fri, 7 Nov 2025 16:01:58 +0000 (08:01 -0800)]
Merge tag 'slab-for-6.18-rc5' of git://git./linux/kernel/git/vbabka/slab
Pull slab fix from Vlastimil Babka:
- Fix for potential infinite loop in kmalloc_nolock() when debugging
is enabled for the cache (Vlastimil Babka)
* tag 'slab-for-6.18-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab:
slab: prevent infinite loop in kmalloc_nolock() with debugging
Linus Torvalds [Fri, 7 Nov 2025 15:52:45 +0000 (07:52 -0800)]
Merge tag 'io_uring-6.18-
20251106' of git://git./linux/kernel/git/axboe/linux
Pull io_uring fixes from Jens Axboe:
- Remove the sync refill API that was added in this release, in
anticipation of doing it in a better way for the next release
- Fix type extension for calculating size off nr_pages, like we do
in other spots
* tag 'io_uring-6.18-
20251106' of git://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux:
io_uring: fix types for region size calulation
io_uring/zcrx: remove sync refill uapi
Linus Torvalds [Fri, 7 Nov 2025 15:47:08 +0000 (07:47 -0800)]
Merge tag 'scsi-fixes' of git://git./linux/kernel/git/jejb/scsi
Pull SCSI fixes from James Bottomley:
"All fixes in the UFS driver.
The big contributor to the diffstats is the Intel controller S0ix/S3
fix which has to special case the suspend/resume patch for intel
controllers in ufshcd-pci.c"
* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
scsi: ufs: core: Fix invalid probe error return value
scsi: ufs: ufs-pci: Set UFSHCD_QUIRK_PERFORM_LINK_STARTUP_ONCE for Intel ADL
scsi: ufs: core: Add a quirk to suppress link_startup_again
scsi: ufs: ufs-pci: Fix S0ix/S3 for Intel controllers
scsi: ufs: core: Revert "Make HID attributes visible"
scsi: ufs: core: Reduce link startup failure logging
scsi: ufs: core: Fix a race condition related to the "hid" attribute group
scsi: ufs: ufs-qcom: Fix UFS OCP issue during UFS power down (PC=3)
Linus Torvalds [Fri, 7 Nov 2025 15:39:57 +0000 (07:39 -0800)]
Merge tag 'v6.18-rc4-smb-server-fixes' of git://git.samba.org/ksmbd
Pull smb server fixes from Steve French:
- More safely detect RDMA capable devices correctly
* tag 'v6.18-rc4-smb-server-fixes' of git://git.samba.org/ksmbd:
ksmbd: detect RDMA capable netdevs include IPoIB
ksmbd: detect RDMA capable lower devices when bridge and vlan netdev is used
Zhang Chujun [Thu, 6 Nov 2025 03:10:40 +0000 (11:10 +0800)]
tracing/tools: Fix incorrcet short option in usage text for --threads
The help message incorrectly listed '-t' as the short option for
--threads, but the actual getopt_long configuration uses '-e'.
This mismatch can confuse users and lead to incorrect command-line
usage. This patch updates the usage string to correctly show:
"-e, --threads NRTHR"
to match the implementation.
Note: checkpatch.pl reports a false-positive spelling warning on
'Run', which is intentional.
Link: https://patch.msgid.link/20251106031040.1869-1-zhangchujun@cmss.chinamobile.com
Signed-off-by: Zhang Chujun <zhangchujun@cmss.chinamobile.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Matthew Brost [Fri, 31 Oct 2025 23:40:45 +0000 (16:40 -0700)]
drm/xe: Enforce correct user fence signaling order using
Prevent application hangs caused by out-of-order fence signaling when
user fences are attached. Use drm_syncobj (via dma-fence-chain) to
guarantee that each user fence signals in order, regardless of the
signaling order of the attached fences. Ensure user fence writebacks to
user space occur in the correct sequence.
v7:
- Skip drm_syncbj create of error (CI)
Fixes:
dd08ebf6c352 ("drm/xe: Introduce a new DRM driver for Intel GPUs")
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patch.msgid.link/20251031234050.3043507-2-matthew.brost@intel.com
(cherry picked from commit
adda4e855ab6409a3edaa585293f1f2069ab7299)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Mario Limonciello (AMD) [Thu, 6 Nov 2025 18:28:54 +0000 (12:28 -0600)]
x86/microcode/AMD: Add more known models to entry sign checking
Two Zen5 systems are missing from need_sha_check(). Add them.
Fixes:
50cef76d5cb0 ("x86/microcode/AMD: Load only SHA256-checksummed patches")
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Cc: <stable@kernel.org>
Link: https://patch.msgid.link/20251106182904.4143757-1-superm1@kernel.org
Jouni Högander [Fri, 31 Oct 2025 12:23:11 +0000 (14:23 +0200)]
drm/xe: Do clean shutdown also when using flr
Currently Xe driver is triggering flr without any clean-up on
shutdown. This is causing random warnings from pending related works as the
underlying hardware is reset in the middle of their execution.
Fix this by performing clean shutdown also when using flr.
Fixes:
501d799a47e2 ("drm/xe: Wire up device shutdown handler")
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Maarten Lankhorst <dev@lankhorst.se>
Link: https://patch.msgid.link/20251031122312.1836534-1-jouni.hogander@intel.com
Signed-off-by: Maarten Lankhorst <dev@lankhorst.se>
(cherry picked from commit
a4ff26b7c8ef38e4dd34f77cbcd73576fdde6dd4)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Tejas Upadhyay [Tue, 7 Oct 2025 10:02:08 +0000 (15:32 +0530)]
drm/xe: Move declarations under conditional branch
The xe_device_shutdown() function was needing a few declarations
that were only required under a specific condition. This change
moves those declarations to be within that conditional branch
to avoid unnecessary declarations.
Reviewed-by: Nitin Gote <nitin.r.gote@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20251007100208.1407021-1-tejas.upadhyay@intel.com
Signed-off-by: Tejas Upadhyay <tejas.upadhyay@intel.com>
(cherry picked from commit
15b3036045188f4da4ca62b2ed01b0f160252e9b)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Balasubramani Vivekanandan [Mon, 3 Nov 2025 12:31:47 +0000 (18:01 +0530)]
drm/xe/guc: Synchronize Dead CT worker with unbind
Cancel and wait for any Dead CT worker to complete before continuing
with device unbinding. Else the worker will end up using resources freed
by the undind operation.
Cc: Zhanjun Dong <zhanjun.dong@intel.com>
Fixes:
d2c5a5a926f4 ("drm/xe/guc: Dead CT helper")
Signed-off-by: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com>
Reviewed-by: Stuart Summers <stuart.summers@intel.com>
Link: https://patch.msgid.link/20251103123144.3231829-6-balasubramani.vivekanandan@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
(cherry picked from commit
492671339114e376aaa38626d637a2751cdef263)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Dave Airlie [Fri, 7 Nov 2025 02:41:23 +0000 (12:41 +1000)]
Merge tag 'mediatek-drm-fixes-
20251105' of https://git./linux/kernel/git/chunkuang.hu/linux into drm-fixes
Mediatek DRM Fixes -
20251105
1. Disable AFBC support on Mediatek DRM driver
2. Add pm_runtime support for GCE power control
Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Link: https://patch.msgid.link/20251105151443.3909-1-chunkuang.hu@kernel.org
Zilin Guan [Thu, 6 Nov 2025 12:01:32 +0000 (12:01 +0000)]
tracing: Fix memory leaks in create_field_var()
The function create_field_var() allocates memory for 'val' through
create_hist_field() inside parse_atom(), and for 'var' through
create_var(), which in turn allocates var->type and var->var.name
internally. Simply calling kfree() to release these structures will
result in memory leaks.
Use destroy_hist_field() to properly free 'val', and explicitly release
the memory of var->type and var->var.name before freeing 'var' itself.
Link: https://patch.msgid.link/20251106120132.3639920-1-zilin@seu.edu.cn
Fixes:
02205a6752f22 ("tracing: Add support for 'field variables'")
Signed-off-by: Zilin Guan <zilin@seu.edu.cn>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Steven Rostedt [Thu, 16 Oct 2025 17:28:48 +0000 (13:28 -0400)]
ring-buffer: Do not warn in ring_buffer_map_get_reader() when reader catches up
The function ring_buffer_map_get_reader() is a bit more strict than the
other get reader functions, and except for certain situations the
rb_get_reader_page() should not return NULL. If it does, it triggers a
warning.
This warning was triggering but after looking at why, it was because
another acceptable situation was happening and it wasn't checked for.
If the reader catches up to the writer and there's still data to be read
on the reader page, then the rb_get_reader_page() will return NULL as
there's no new page to get.
In this situation, the reader page should not be updated and no warning
should trigger.
Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Vincent Donnefort <vdonnefort@google.com>
Reported-by: syzbot+92a3745cea5ec6360309@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/
690babec.
050a0220.baf87.0064.GAE@google.com/
Link: https://lore.kernel.org/20251016132848.1b11bb37@gandalf.local.home
Fixes:
117c39200d9d7 ("ring-buffer: Introducing ring-buffer mapping functions")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Linus Torvalds [Fri, 7 Nov 2025 00:24:12 +0000 (16:24 -0800)]
Merge tag 'probes-fixes-v6.18-rc4' of git://git./linux/kernel/git/trace/linux-trace
Pull probe fixes from Masami Hiramatsu:
- tprobe-events: Fix to register tracepoint correctly
tprobe-events missed to set tracepoint data structure before
registering callback when enabling it. This sets it correctly.
- tprobe-events: Fix to put tracepoint_user when disable the event
tprobe-events missed to unregister tracepoint callback when the event
is disabled. This ensures to unregister it.
* tag 'probes-fixes-v6.18-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
tracing: tprobe-events: Fix to put tracepoint_user when disable the tprobe
tracing: tprobe-events: Fix to register tracepoint correctly
Linus Torvalds [Fri, 7 Nov 2025 00:05:33 +0000 (16:05 -0800)]
Merge tag 'perf-tools-fixes-for-v6.18-1-2025-11-06' of git://git./linux/kernel/git/perf/perf-tools
Pull perf tools fixes from Arnaldo Carvalho de Melo:
- Add James Clark as a perf tools reviewer
- Handle '1' type symbols in /proc/kallsyms, related to anonymous
Rust closures in the DRM panic QR encoder, caught by 'perf test'
- Sync kernel header copies: MSRs, uprobe syscall,
DRM_IOCTL_GEM_CHANGE_HANDLE, KVM exit reasons, etc
* tag 'perf-tools-fixes-for-v6.18-1-2025-11-06' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools:
perf symbols: Handle '1' symbols in /proc/kallsyms
tools headers asm: Sync fls headers header with the kernel sources
tools headers UAPI: Sync KVM's vmx.h header with the kernel sources to handle new exit reasons
tools headers svm: Sync svm headers with the kernel sources
tools headers UAPI: Sync x86's asm/kvm.h with the kernel sources
MAINTAINERS: Add James Clark as a perf tools reviewer
tools headers UAPI: Sync linux/kvm.h with the kernel sources
tools headers UAPI: Update tools's copy of drm.h to pick DRM_IOCTL_GEM_CHANGE_HANDLE
tools headers x86 cpufeatures: Sync with the kernel sources
tools headers x86: Sync table due to introducion of uprobe syscall
tools headers: Sync uapi/linux/fcntl.h with the kernel sources
tools headers: Sync uapi/linux/prctl.h with the kernel source
tools headers uapi: Update fs.h with the kernel sources
tools arch x86: Sync msr-index.h to pick AMD64_{PERF_CNTR_GLOBAL_STATUS_SET,SAVIC_CONTROL}, IA32_L3_QOS_{ABMC,EXT}_CFG
Linus Torvalds [Thu, 6 Nov 2025 23:44:18 +0000 (15:44 -0800)]
Merge tag 'riscv-for-linus-6.18-rc5' of git://git./linux/kernel/git/riscv/linux
Pull RISC-V fixes from Paul Walmsley:
- A fix to disable KASAN checks while walking a non-current task's
stackframe (following x86)
- A fix for a kvrealloc()-related memory leak in
module_frob_arch_sections()
- Two replacements of strcpy() with strscpy()
- A change to use the RISC-V .insn assembler directive when possible to
assemble instructions from hex opcodes
- Some low-impact fixes in the ptdump code and kprobes test code
* tag 'riscv-for-linus-6.18-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
cpuidle: riscv-sbi: Replace deprecated strcpy in sbi_cpuidle_init_cpu
riscv: KGDB: Replace deprecated strcpy in kgdb_arch_handle_qxfer_pkt
riscv: asm: use .insn for making custom instructions
riscv: tests: Make RISCV_KPROBES_KUNIT tristate
riscv: tests: Rename kprobes_test_riscv to kprobes_riscv
riscv: Fix memory leak in module_frob_arch_sections()
riscv: ptdump: use seq_puts() in pt_dump_seq_puts() macro
riscv: stacktrace: Disable KASAN checks for non-current tasks