linux-hardening - Re: How large is the xtensa pt_regs::areg array supposed to be?

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Date:   Sat, 5 Mar 2022 12:43:23 -0800
From:   Max Filippov <jcmvbkbc@...il.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Chris Zankel <chris@...kel.net>,
        "open list:TENSILICA XTENSA PORT (xtensa)" 
        <linux-xtensa@...ux-xtensa.org>, linux-hardening@...r.kernel.org
Subject: Re: How large is the xtensa pt_regs::areg array supposed to be?

Hi Kees,

On Wed, Feb 2, 2022 at 3:03 PM Kees Cook <keescook@...omium.org> wrote:
> When building with -Warray-bounds, I see this:
>
> In file included from ./include/linux/uaccess.h:11,
>                  from ./include/linux/sched/task.h:11,
>                  from arch/xtensa/kernel/process.c:21:
> arch/xtensa/kernel/process.c: In function 'copy_thread':
> arch/xtensa/kernel/process.c:262:52: warning: array subscript 53 is above array bounds of 'long unsigned int[16]' [-Warray-bounds]

I tried to reproduce this by building with -Warray-bounds added to
KBUILD_CFLAGS but couldn't get neither gcc-11 nor the current
gcc trunk to issue this warning. How did you get it?

-- 
Thanks.
-- Max