af_unix: annote lockless accesses to unix_tot_inflight & gc_in_progress

wait_for_unix_gc() reads unix_tot_inflight & gc_in_progress
without synchronization.

Adds READ_ONCE()/WRITE_ONCE() and their associated comments
to better document the intent.

BUG: KCSAN: data-race in unix_inflight / wait_for_unix_gc

write to 0xffffffff86e2b7c0 of 4 bytes by task 9380 on cpu 0:
 unix_inflight+0x1e8/0x260 net/unix/scm.c:63
 unix_attach_fds+0x10c/0x1e0 net/unix/scm.c:121
 unix_scm_to_skb net/unix/af_unix.c:1674 [inline]
 unix_dgram_sendmsg+0x679/0x16b0 net/unix/af_unix.c:1817
 unix_seqpacket_sendmsg+0xcc/0x110 net/unix/af_unix.c:2258
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 ____sys_sendmsg+0x39a/0x510 net/socket.c:2409
 ___sys_sendmsg net/socket.c:2463 [inline]
 __sys_sendmmsg+0x267/0x4c0 net/socket.c:2549
 __do_sys_sendmmsg net/socket.c:2578 [inline]
 __se_sys_sendmmsg net/socket.c:2575 [inline]
 __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2575
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffffff86e2b7c0 of 4 bytes by task 9375 on cpu 1:
 wait_for_unix_gc+0x24/0x160 net/unix/garbage.c:196
 unix_dgram_sendmsg+0x8e/0x16b0 net/unix/af_unix.c:1772
 unix_seqpacket_sendmsg+0xcc/0x110 net/unix/af_unix.c:2258
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 ____sys_sendmsg+0x39a/0x510 net/socket.c:2409
 ___sys_sendmsg net/socket.c:2463 [inline]
 __sys_sendmmsg+0x267/0x4c0 net/socket.c:2549
 __do_sys_sendmmsg net/socket.c:2578 [inline]
 __se_sys_sendmmsg net/socket.c:2575 [inline]
 __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2575
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000002 -> 0x00000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9375 Comm: syz-executor.1 Not tainted 5.16.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011

Fixes: 9915672d4127 ("af_unix: limit unix_tot_inflight")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Link: https://lore.kernel.org/r/20220114164328.2038499-1-eric.dumazet@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/unix/garbage.c b/net/unix/garbage.c
index 12e2dda..d45d536 100644 (file)
--- a/net/unix/garbage.c
+++ b/net/unix/garbage.c
@@ -192,8 +192,11 @@ void wait_for_unix_gc(void)
 {
        /* If number of inflight sockets is insane,
         * force a garbage collect right now.
+        * Paired with the WRITE_ONCE() in unix_inflight(),
+        * unix_notinflight() and gc_in_progress().
         */
-       if (unix_tot_inflight > UNIX_INFLIGHT_TRIGGER_GC && !gc_in_progress)
+       if (READ_ONCE(unix_tot_inflight) > UNIX_INFLIGHT_TRIGGER_GC &&
+           !READ_ONCE(gc_in_progress))
                unix_gc();
        wait_event(unix_gc_wait, gc_in_progress == false);
 }
@@ -213,7 +216,9 @@ void unix_gc(void)
        if (gc_in_progress)
                goto out;
 
-       gc_in_progress = true;
+       /* Paired with READ_ONCE() in wait_for_unix_gc(). */
+       WRITE_ONCE(gc_in_progress, true);
+
        /* First, select candidates for garbage collection.  Only
         * in-flight sockets are considered, and from those only ones
         * which don't have any external reference.
@@ -299,7 +304,10 @@ void unix_gc(void)
 
        /* All candidates should have been detached by now. */
        BUG_ON(!list_empty(&gc_candidates));
-       gc_in_progress = false;
+
+       /* Paired with READ_ONCE() in wait_for_unix_gc(). */
+       WRITE_ONCE(gc_in_progress, false);
+
        wake_up(&unix_gc_wait);
 
  out:

diff --git a/net/unix/scm.c b/net/unix/scm.c
index 052ae70..aa27a02 100644 (file)
--- a/net/unix/scm.c
+++ b/net/unix/scm.c
@@ -60,7 +60,8 @@ void unix_inflight(struct user_struct *user, struct file *fp)
                } else {
                        BUG_ON(list_empty(&u->link));
                }
-               unix_tot_inflight++;
+               /* Paired with READ_ONCE() in wait_for_unix_gc() */
+               WRITE_ONCE(unix_tot_inflight, unix_tot_inflight + 1);
        }
        user->unix_inflight++;
        spin_unlock(&unix_gc_lock);
@@ -80,7 +81,8 @@ void unix_notinflight(struct user_struct *user, struct file *fp)
 
                if (atomic_long_dec_and_test(&u->inflight))
                        list_del_init(&u->link);
-               unix_tot_inflight--;
+               /* Paired with READ_ONCE() in wait_for_unix_gc() */
+               WRITE_ONCE(unix_tot_inflight, unix_tot_inflight - 1);
        }
        user->unix_inflight--;
        spin_unlock(&unix_gc_lock);