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

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Message-ID: <CAMo8BfLrcK5NOVZeWB-Ut1BKbFaVcrkzNT=_JX++HXWTi1KesQ@mail.gmail.com>
Date:   Sat, 5 Mar 2022 17:50:30 -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?

On Sat, Mar 5, 2022 at 12:43 PM Max Filippov <jcmvbkbc@...il.com> wrote:
> 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?

Never mind, it reproduces with the current -next tree.

-- 
Thanks.
-- Max