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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAMo8BfKO-ysOrYFGpZNsorZ-zyMWY5CObC1Oie0ubuXVF=ZCbg@mail.gmail.com>
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