Searched hist:"75 edb54a1dea5ea1c8d3d82e27dc9ee3070f5935" (Results 1 – 1 of 1) sorted by relevance
| /linux/arch/x86/include/asm/ |
| H A D | processor.h | diff 75edb54a1dea5ea1c8d3d82e27dc9ee3070f5935 Thu Feb 04 16:27:50 CET 2016 Dmitry Vyukov <dvyukov@google.com> x86: Fix KASAN false positives in thread_saved_pc()
thread_saved_pc() reads stack of a potentially running task.
This can cause false KASAN stack-out-of-bounds reports,
because the running task concurrently poisons and unpoisons
own stack.
The same happens in get_wchan(), and get get_wchan() was fixed
by using READ_ONCE_NOCHECK(). Do the same here.
Example KASAN report triggered by sysrq-t:
BUG: KASAN: out-of-bounds in sched_show_task+0x306/0x3b0 at addr ffff880043c97c18
Read of size 8 by task syz-executor/23839
[...]
page dumped because: kasan: bad access detected
[...]
Call Trace:
[<ffffffff8175ea0e>] __asan_report_load8_noabort+0x3e/0x40
[<ffffffff813e7a26>] sched_show_task+0x306/0x3b0
[<ffffffff813e7bf4>] show_state_filter+0x124/0x1a0
[<ffffffff82d2ca00>] fn_show_state+0x10/0x20
[<ffffffff82d2cf98>] k_spec+0xa8/0xe0
[<ffffffff82d3354f>] kbd_event+0xb9f/0x4000
[<ffffffff843ca8a7>] input_to_handler+0x3a7/0x4b0
[<ffffffff843d1954>] input_pass_values.part.5+0x554/0x6b0
[<ffffffff843d29bc>] input_handle_event+0x2ac/0x1070
[<ffffffff843d3a47>] input_inject_event+0x237/0x280
[<ffffffff843e8c28>] evdev_write+0x478/0x680
[<ffffffff817ac653>] __vfs_write+0x113/0x480
[<ffffffff817ae0e7>] vfs_write+0x167/0x4a0
[<ffffffff817b13d1>] SyS_write+0x111/0x220
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: glider@google.com
Cc: kasan-dev@googlegroups.com
Cc: kcc@google.com
Cc: linux-kernel@vger.kernel.org
Cc: ryabinin.a.a@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
|