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tracing: Don't make assumptions about length of string on task rename 

While the dest comm string size is assured to be at least TASK_COMM_LEN long,
doing a memcpy() also adds the assumption that the source is at least that
long as well, which isn't assured, and isn't true in cases such as:

	set_task_comm(worker->task, "kworker/dying");

This leads to accessing invalid memory.

Link: http://lkml.kernel.org/r/1440760018-1557-1-git-send-email-sasha.levin@oracle.com

Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Sasha Levin 2015-08-28 07:06:58 -04:00 committed by Steven Rostedt
parent 9f61668073
commit f0a5157803
1 changed files with 1 additions and 1 deletions
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2
include/trace/events/task.h
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@ -46,7 +46,7 @@ TRACE_EVENT(task_rename,
TP_fast_assign(
__entry->pid = task->pid;
memcpy(entry->oldcomm, task->comm, TASK_COMM_LEN);
memcpy(entry->newcomm, comm, TASK_COMM_LEN);
strlcpy(entry->newcomm, comm, TASK_COMM_LEN);
__entry->oom_score_adj = task->signal->oom_score_adj;
),