diff options
| author | Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> | 2009-09-15 14:44:36 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-15 09:53:31 +0200 |
| commit | b3e62e35058fc744ac794611f4e79bcd1c5a4b83 (patch) | |
| tree | 797092fc19f9af8b6e5242c1987137dd362f51bc /kernel/perf_counter.c | |
| parent | 74fca6a42863ffacaf7ba6f1936a9f228950f657 (diff) | |
| download | lwn-b3e62e35058fc744ac794611f4e79bcd1c5a4b83.tar.gz lwn-b3e62e35058fc744ac794611f4e79bcd1c5a4b83.zip | |
perf_counter: Fix buffer overflow in perf_copy_attr()
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>
Diffstat (limited to 'kernel/perf_counter.c')
| -rw-r--r-- | kernel/perf_counter.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index d7cbc579fc80..a67a1dc3cfa3 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -4171,6 +4171,7 @@ static int perf_copy_attr(struct perf_counter_attr __user *uattr, if (val) goto err_size; } + size = sizeof(*attr); } ret = copy_from_user(attr, uattr, size); |