linux-kernel - Re: [PATCH][next] mm/pgtable: Fix multiple -Wstringop-overflow warnings

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Message-Id: <166951102250.2406619.18299131310725462090.b4-ty@chromium.org>
Date:   Sat, 26 Nov 2022 17:03:44 -0800
From:   Kees Cook <keescook@...omium.org>
To:     gustavoars@...nel.org
Cc:     Kees Cook <keescook@...omium.org>, mingo@...hat.com,
        dave.hansen@...ux.intel.com, hpa@...or.com, luto@...nel.org,
        tglx@...utronix.de, bp@...en8.de, peterz@...radead.org,
        x86@...nel.org, linux-hardening@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] mm/pgtable: Fix multiple -Wstringop-overflow warnings

On Wed, 21 Sep 2022 13:46:03 -0500, Gustavo A. R. Silva wrote:
> The actual size of the following arrays at run-time depends on
> CONFIG_X86_PAE.
> 
> 427         pmd_t *u_pmds[MAX_PREALLOCATED_USER_PMDS];
> 428         pmd_t *pmds[MAX_PREALLOCATED_PMDS];
> 
> If CONFIG_X86_PAE is not enabled, their final size will be zero. In that
> case, the compiler complains about trying to access objects of size zero
> when calling functions where these objects are passed as arguments.
> 
> [...]

Applied to for-next/hardening with tweaks to the commit log, thanks!

[1/1] mm/pgtable: Fix multiple -Wstringop-overflow warnings
      https://git.kernel.org/kees/c/9af98f78d2cd

-- 
Kees Cook