tracing: Don't make assumptions about length of string on task rename
authorSasha Levin <sasha.levin@oracle.com>
Fri, 28 Aug 2015 11:06:58 +0000 (07:06 -0400)
committerSteven Rostedt <rostedt@goodmis.org>
Mon, 31 Aug 2015 14:47:14 +0000 (10:47 -0400)
commitf0a515780393dffbb363e6d1567da46af6f3c5f3
treecad3408ace5cb1542a4eca314eaa847436ab0ff3
parent9f61668073a8d80650622e792aff876db9ca23c6
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>
include/trace/events/task.h