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authorArun Sharma <asharma@fb.com>2012-04-20 15:41:36 -0700
committerIngo Molnar <mingo@kernel.org>2012-06-06 17:08:04 +0200
commitdb0dc75d6403b6663c0eab4c6ccb672eb9b2ed72 (patch)
tree9c23cf7df8683a3c54bd7f074ceef16712aa7272 /arch/x86/lib
parentbc6ca7b342d5ae15c3ba3081fd40271b8039fb25 (diff)
perf/x86: Check user address explicitly in copy_from_user_nmi()
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>
Diffstat (limited to 'arch/x86/lib')
-rw-r--r--arch/x86/lib/usercopy.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/lib/usercopy.c b/arch/x86/lib/usercopy.c
index f61ee67ec00..677b1ed184c 100644
--- a/arch/x86/lib/usercopy.c
+++ b/arch/x86/lib/usercopy.c
@@ -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)