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perf_counter: Fix buffer overflow in perf_copy_attr()

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If we pass a big size data over perf_counter_open() syscall,
the kernel will copy this data to a small buffer, it will
cause kernel crash.

This bug makes the kernel unsafe and non-root local user can
trigger it.

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Paul Mackerras <paulus@samba.org>
Cc: <stable@kernel.org>
LKML-Reference: <4AAF37D4.5010706@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Xiao Guangrong 2009-09-15 14:44:36 +08:00 committed by Ingo Molnar
parent 74fca6a428
commit b3e62e3505
1 changed files with 1 additions and 0 deletions
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kernel/perf_counter.c
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@ -4171,6 +4171,7 @@ static int perf_copy_attr(struct perf_counter_attr __user *uattr,
if (val) if (val)
goto err_size; goto err_size;
} }
size = sizeof(*attr);
} }
ret = copy_from_user(attr, uattr, size); ret = copy_from_user(attr, uattr, size);