linux-hardening - Re: [GIT PULL] Enable -Wstringop-overflow globally

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Date: Fri, 26 Jan 2024 15:30:20 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>,
 "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Kees Cook <keescook@...omium.org>, linux-hardening@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [GIT PULL] Enable -Wstringop-overflow globally

On 1/26/24 15:22, Linus Torvalds wrote:
> On Mon, 22 Jan 2024 at 07:29, Gustavo A. R. Silva <gustavoars@...nel.org> wrote:
>>
>> Enable -Wstringop-overflow globally
> 
> I suspect I'll have to revert this.
> 
> On arm64, I get a "writing 16 bytes into a region of size 0" in the Xe driver
> 
>     drivers/gpu/drm/xe/xe_gt_pagefault.c:340
> 
> but I haven't looked into it much yet.
> 
> It's not some gcc-11 issue, though, this is with gcc version 13.2.1
> 
> It looks like the kernel test robot reported this too (for s390), at
> 
>      https://lore.kernel.org/all/202401161031.hjGJHMiJ-lkp@intel.com/T/
> 
> and in that case it was gcc-13.2.0.
> 
> So I don't think the issue is about gcc-11 at all, but about other
> random details.

Let me take a look.

--
Gustavo