The commit is pushed to "branch-rh7-3.10.0-229.7.2.vz7.9.x-ovz" and will appear
at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-229.7.2.vz7.9.10
------>
commit 2d5765017a3d21512b5330065f34facd744c5b77
Author: Andrey Ryabinin <aryabi...@virtuozzo.com>
Date: Wed Nov 18 13:23:16 2015 +0400
ms/x86/mm, kasan: Silence KASAN warnings in get_wchan()
get_wchan() is racy by design, it may access volatile stack
of running task, thus it may access redzone in a stack frame
and cause KASAN to warn about this.
Use READ_ONCE_NOCHECK() to silence these warnings.
Reported-by: Sasha Levin <sasha.le...@oracle.com>
Signed-off-by: Andrey Ryabinin <aryabi...@virtuozzo.com>
Cc: Alexander Potapenko <gli...@google.com>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Andrey Konovalov <andreyk...@google.com>
Cc: Andy Lutomirski <l...@amacapital.net>
Cc: Borislav Petkov <b...@alien8.de>
Cc: Denys Vlasenko <dvlas...@redhat.com>
Cc: Dmitry Vyukov <dvyu...@google.com>
Cc: Kostya Serebryany <k...@google.com>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Paul E. McKenney <paul...@linux.vnet.ibm.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Wolfram Gloger <wm...@dent.med.uni-muenchen.de>
Cc: kasan-dev <kasan-...@googlegroups.com>
Link:
http://lkml.kernel.org/r/1445243838-17763-3-git-send-email-aryabi...@virtuozzo.com
Signed-off-by: Ingo Molnar <mi...@kernel.org>
(cherry picked from commit f7d27c35ddff7c100d7a98db499ac0040149ac05)
Signed-off-by: Andrey Ryabinin <aryabi...@virtuozzo.com>
Signed-off-by: Andrey Ryabinin <aryabi...@virtuozzo.com>
---
arch/x86/kernel/process.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index ee3666a..3b1e6b1 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -514,14 +514,14 @@ unsigned long get_wchan(struct task_struct *p)
if (sp < bottom || sp > top)
return 0;
- fp = READ_ONCE(*(unsigned long *)sp);
+ fp = READ_ONCE_NOCHECK(*(unsigned long *)sp);
do {
if (fp < bottom || fp > top)
return 0;
- ip = READ_ONCE(*(unsigned long *)(fp + sizeof(unsigned long)));
+ ip = READ_ONCE_NOCHECK(*(unsigned long *)(fp + sizeof(unsigned
long)));
if (!in_sched_functions(ip))
return ip;
- fp = READ_ONCE(*(unsigned long *)fp);
+ fp = READ_ONCE_NOCHECK(*(unsigned long *)fp);
} while (count++ < 16 && p->state != TASK_RUNNING);
return 0;
}
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