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perf/x86: Check user address explicitly in copy_from_user_nmi()

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Signed-off-by: Arun Sharma <asharma@fb.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1334961696-19580-5-git-send-email-asharma@fb.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Arun Sharma 2012-04-20 15:41:36 -07:00 committed by Ingo Molnar
parent bc6ca7b342
commit db0dc75d64
1 changed files with 4 additions and 0 deletions
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4
arch/x86/lib/usercopy.c
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@ -8,6 +8,7 @@
#include <linux/module.h>
#include <asm/word-at-a-time.h>
#include <linux/sched.h>
/*
* best effort, GUP based copy_from_user() that is NMI-safe
@ -21,6 +22,9 @@ copy_from_user_nmi(void *to, const void __user *from, unsigned long n)
void *map;
int ret;
if (__range_not_ok(from, n, TASK_SIZE) == 0)
return len;
do {
ret = __get_user_pages_fast(addr, 1, 0, &page);
if (!ret)