From: Kees Cook <keescook@chromium.org>
Date: Thu, 15 Nov 2012 21:12:17 +0000 (+0100)
Subject: ARM: 7579/1: arch/allow a scno of -1 to not cause a SIGILL
X-Git-Tag: omap-for-v3.8/fixes-for-merge-window-v4-signed~53^2~1^4~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ad75b51459ae076a0d406391496f81b897bf6992;p=pandora-kernel.git

ARM: 7579/1: arch/allow a scno of -1 to not cause a SIGILL

On tracehook-friendly platforms, a system call number of -1 falls
through without running much code or taking much action.

ARM is different. This adds a short-circuit check in the trace path to
avoid any additional work, as suggested by Russell King, to make sure
that ARM behaves the same way as other platforms.

Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Will Drewry <wad@chromium.org>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---

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