From: Sasha Levin Date: Fri, 28 Aug 2015 11:06:58 +0000 (-0400) Subject: tracing: Don't make assumptions about length of string on task rename X-Git-Tag: v5.15~15121^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f0a515780393dffbb363e6d1567da46af6f3c5f3;p=platform%2Fkernel%2Flinux-starfive.git 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 Signed-off-by: Steven Rostedt --- diff --git a/include/trace/events/task.h b/include/trace/events/task.h index dee3bb1..2cca6cd 100644 --- a/include/trace/events/task.h +++ b/include/trace/events/task.h @@ -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; ),