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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>
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@ -8,6 +8,7 @@
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#include <linux/module.h>
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#include <asm/word-at-a-time.h>
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#include <linux/sched.h>
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/*
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* best effort, GUP based copy_from_user() that is NMI-safe
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@ -21,6 +22,9 @@ copy_from_user_nmi(void *to, const void __user *from, unsigned long n)
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void *map;
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int ret;
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if (__range_not_ok(from, n, TASK_SIZE) == 0)
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return len;
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do {
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ret = __get_user_pages_fast(addr, 1, 0, &page);
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if (!ret)
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