From: Chris Wright <chrisw@sous-sol.org>
Date: Thu, 9 Sep 2010 23:34:59 +0000 (-0700)
Subject: tracing: t_start: reset FTRACE_ITER_HASH in case of seek/pread
X-Git-Tag: v2.6.36-rc4~16^2^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=df09162550fbb53354f0c88e85b5d0e6129ee9cc;p=pandora-kernel.git

tracing: t_start: reset FTRACE_ITER_HASH in case of seek/pread

Be sure to avoid entering t_show() with FTRACE_ITER_HASH set without
having properly started the iterator to iterate the hash.  This case is
degenerate and, as discovered by Robert Swiecki, can cause t_hash_show()
to misuse a pointer.  This causes a NULL ptr deref with possible security
implications.  Tracked as CVE-2010-3079.

Cc: Robert Swiecki <swiecki@google.com>
Cc: Eugene Teo <eugene@redhat.com>
Cc: <stable@kernel.org>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---

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