From: Suresh Siddha <suresh.b.siddha@intel.com>
Date: Mon, 3 Mar 2008 21:01:08 +0000 (-0800)
Subject: x86, i387: fix ptrace leakage using init_fpu()
X-Git-Tag: v2.6.25-rc4~96^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=18a8622101154277df97e24097ed17aace84fa3a;p=pandora-kernel.git

x86, i387: fix ptrace leakage using init_fpu()

This bug got introduced by the recent i387 merge:

  commit 4421011120b2304e5c248ae4165a2704588aedf1
  Author: Roland McGrath <roland@redhat.com>
  Date:   Wed Jan 30 13:31:50 2008 +0100

      x86: x86 i387 user_regset

Current usage of unlazy_fpu() in ptrace specific routines is wrong.
unlazy_fpu() will not init fpu if the task never used math. So the
ptrace calls can expose the parent tasks FPU data in some cases.

Replace it with the init_fpu() which will init the math state, if the
task never used math before.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
---

Reading git-diff-tree failed