From: Nathan Lynch <nathan_lynch@mentor.com>
Date: Thu, 11 Sep 2014 01:49:08 +0000 (+0100)
Subject: ARM: 8148/1: flush TLS and thumbee register state during exec
X-Git-Tag: fixes-for-v3.18-merge-window~94^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fbfb872f5f417cea48760c535e0ff027c88b507a;p=pandora-kernel.git

ARM: 8148/1: flush TLS and thumbee register state during exec

The TPIDRURO and TPIDRURW registers need to be flushed during exec;
otherwise TLS information is potentially leaked.  TPIDRURO in
particular needs careful treatment.  Since flush_thread basically
needs the same code used to set the TLS in arm_syscall, pull that into
a common set_tls helper in tls.h and use it in both places.

Similarly, TEEHBR needs to be cleared during exec as well.  Clearing
its save slot in thread_info isn't right as there is no guarantee
that a thread switch will occur before the new program runs.  Just
setting the register directly is sufficient.

Signed-off-by: Nathan Lynch <nathan_lynch@mentor.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

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