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tracing: Add paranoid size check in trace_printk_seq()

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To be really paranoid about writing out of bound data in
trace_printk_seq(), add another check of len compared to size.

Link: http://lkml.kernel.org/r/20141119144004.GB2332@dhcp128.suse.cz

Suggested-by: Petr Mladek <pmladek@suse.cz>
Reviewed-by: Petr Mladek <pmladek@suse.cz>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-11-19 10:56:41 -05:00 committed by Steven Rostedt
parent 5ac4837841
commit 820b75f63d
1 changed files with 8 additions and 0 deletions
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8
kernel/trace/trace.c
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@ -6656,6 +6656,14 @@ trace_printk_seq(struct trace_seq *s)
if (s->seq.len >= TRACE_MAX_PRINT)
s->seq.len = TRACE_MAX_PRINT;
/*
* More paranoid code. Although the buffer size is set to
* PAGE_SIZE, and TRACE_MAX_PRINT is 1000, this is just
* an extra layer of protection.
*/
if (WARN_ON_ONCE(s->seq.len >= s->seq.size))
s->seq.len = s->seq.size - 1;
/* should be zero ended, but we are paranoid. */
s->buffer[s->seq.len] = 0;