From: Andy Lutomirski <luto@amacapital.net>
Date: Tue, 22 Jul 2014 01:49:16 +0000 (-0700)
Subject: seccomp: Allow arch code to provide seccomp_data
X-Git-Tag: fixes-against-v3.18-rc2~86^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d39bd00deabe57420f2a3669eb71b0e0c4997184;p=pandora-kernel.git

seccomp: Allow arch code to provide seccomp_data

populate_seccomp_data is expensive: it works by inspecting
task_pt_regs and various other bits to piece together all the
information, and it's does so in multiple partially redundant steps.

Arch-specific code in the syscall entry path can do much better.

Admittedly this adds a bit of additional room for error, but the
speedup should be worth it.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Kees Cook <keescook@chromium.org>
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