Re: [PATCH v16 16/16] selftests, arm64: add a selftest for passing tagged pointers to kernel

From: shuah
Date: Mon Jun 10 2019 - 18:12:40 EST

On 6/7/19 9:56 PM, Kees Cook wrote:
On Mon, Jun 03, 2019 at 06:55:18PM +0200, Andrey Konovalov wrote:
This patch is a part of a series that extends arm64 kernel ABI to allow to
pass tagged user pointers (with the top byte set to something else other
than 0x00) as syscall arguments.

This patch adds a simple test, that calls the uname syscall with a
tagged user pointer as an argument. Without the kernel accepting tagged
user pointers the test fails with EFAULT.

Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>

I'm adding Shuah to CC in case she has some suggestions about the new

Thanks Kees.

Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>


Looks good to me.

Acked-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>

-- Shuah