x86/mm: Handle mm_fault_error() in kernel space
authorAndrey Vagin <avagin@openvz.org>
Wed, 9 Mar 2011 23:22:23 +0000 (15:22 -0800)
committerIngo Molnar <mingo@elte.hu>
Thu, 10 Mar 2011 08:41:40 +0000 (09:41 +0100)
commitf86268549f424f83b9eb0963989270e14fbfc3de
tree55fb3f1755a5cb8d81daecfef3aa84bb4ea340e8
parenta7bd1dafdcc13ec7add4aafc927eb5e3a8d597e6
x86/mm: Handle mm_fault_error() in kernel space

mm_fault_error() should not execute oom-killer, if page fault
occurs in kernel space.  E.g. in copy_from_user()/copy_to_user().

This would happen if we find ourselves in OOM on a
copy_to_user(), or a copy_from_user() which faults.

Without this patch, the kernels hangs up in copy_from_user(),
because OOM killer sends SIG_KILL to current process, but it
can't handle a signal while in syscall, then the kernel returns
to copy_from_user(), reexcute current command and provokes
page_fault again.

With this patch the kernel return -EFAULT from copy_from_user().

The code, which checks that page fault occurred in kernel space,
has been copied from do_sigbus().

This situation is handled by the same way on powerpc, xtensa,
tile, ...

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: <stable@kernel.org>
LKML-Reference: <201103092322.p29NMNPH001682@imap1.linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
arch/x86/mm/fault.c