Messages in this thread | | | Date | Wed, 27 Jul 2022 13:32:09 -0700 | From | Kees Cook <> | Subject | Re: [PATCH -next v3 2/2] powerpc: add support for syscall stack randomization |
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On Fri, Jul 01, 2022 at 04:24:35PM +0800, Xiu Jianfeng wrote: > Add support for adding a random offset to the stack while handling > syscalls. This patch uses mftb() instead of get_random_int() for better > performance. > > In order to avoid unconditional stack canaries on syscall entry (due to > the use of alloca()), also disable stack protector to avoid triggering > needless checks and slowing down the entry path. As there is no general > way to control stack protector coverage with a function attribute, this > must be disabled at the compilation unit level. > > Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
-Kees
-- Kees Cook
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