linux-kernel - [PATCH 0/2] [GIT PULL] tracing: Fix event null strings and function graph with modules

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Date:	Tue, 26 Nov 2013 20:38:41 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	linux-kernel@...r.kernel.org
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: [PATCH 0/2] [GIT PULL] tracing: Fix event null strings and function graph with modules

This includes two fixes.

1) is a bug fix that happens when root does the following:

  echo function_graph > current_tracer
  modprobe foo
  echo nop > current_tracer

This causes the ftrace internal accounting to get screwed up and
crashes ftrace, preventing the user from using the function tracer
after that.

2) if a TRACE_EVENT has a string field, and NULL is given for it.

The internal trace event code does a strlen() and strcpy() on the
source of field. If it is NULL it causes the system to oops.

This bug has been there since 2.6.31, but no TRACE_EVENT ever passed
in a NULL to the string field, until now.

  git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
trace-fixes-v3.13-rc1

Tag SHA1: 8186830c5ab0c57fae8e081ef0321443d8acb14c
Head SHA1: 8a56d7761d2d041ae5e8215d20b4167d8aa93f51


Steven Rostedt (Red Hat) (2):
      tracing: Allow events to have NULL strings
      ftrace: Fix function graph with loading of modules

----
 include/trace/ftrace.h |  5 ++--
 kernel/trace/ftrace.c  | 64 +++++++++++++++++++++++++++-----------------------
 2 files changed, 38 insertions(+), 31 deletions(-)
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