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| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2018-05-11 19:54:19 +0900 |
|---|---|---|
| committer | Petr Mladek <pmladek@suse.com> | 2018-05-16 14:00:46 +0200 |
| commit | 988a35f8da1dec5a8cd2788054d1e717be61bf25 (patch) | |
| tree | e925f33580d5c761c0fe4bbe6eebb4a089eed20d /kernel/printk/internal.h | |
| parent | 43a17111c2553925f65e7be9b9c3f9d90cf29a8b (diff) | |
| download | blackbird-obmc-linux-988a35f8da1dec5a8cd2788054d1e717be61bf25.tar.gz blackbird-obmc-linux-988a35f8da1dec5a8cd2788054d1e717be61bf25.zip | |
printk: fix possible reuse of va_list variable
I noticed that there is a possibility that printk_safe_log_store() causes
kernel oops because "args" parameter is passed to vsnprintf() again when
atomic_cmpxchg() detected that we raced. Fix this by using va_copy().
Link: http://lkml.kernel.org/r/201805112002.GIF21216.OFVHFOMLJtQFSO@I-love.SAKURA.ne.jp
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: dvyukov@google.com
Cc: syzkaller@googlegroups.com
Cc: fengguang.wu@intel.com
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Fixes: 42a0bb3f71383b45 ("printk/nmi: generic solution for safe printk in NMI")
Cc: 4.7+ <stable@vger.kernel.org> # v4.7+
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Diffstat (limited to 'kernel/printk/internal.h')
0 files changed, 0 insertions, 0 deletions
