tree cbf024b04979925f657fb5fead7d10edac2efbe7
parent 9e8084d3f761413b2d58b2625bc6e332eab2bfce
author Kees Cook <keescook@chromium.org> 1502917753 -0700
committer Kees Cook <keescook@chromium.org> 1516046886 -0800

arm: Implement thread_struct whitelist for hardened usercopy

While ARM32 carries FPU state in the thread structure that is saved and
restored during signal handling, it doesn't need to declare a usercopy
whitelist, since existing accessors are all either using a bounce buffer
(for which whitelisting isn't checking the slab), are statically sized
(which will bypass the hardened usercopy check), or both.

Cc: Russell King <linux@armlinux.org.uk>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Kees Cook <keescook@chromium.org>