linux-hardening - Re: [PATCH] compiler_types.h: Test for __alloc_size_

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Date:   Thu, 29 Sep 2022 02:41:06 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Yonghong Song <yhs@...com>, Hao Luo <haoluo@...gle.com>,
        Marco Elver <elver@...gle.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Kumar Kartikeya Dwivedi <memxor@...il.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] compiler_types.h: Test for __alloc_size__ again

On Thu, Sep 29, 2022 at 11:14:47AM +0200, Vlastimil Babka wrote:
> On 9/29/22 10:16, Kees Cook wrote:
> > While the "alloc_size" attribute is available on all GCC versions, I
> > forgot that it gets disabled explicitly by the kernel in GCC < 9.1 due
> > to misbehaviors. Add a note to the compiler_attributes.h entry for it,
> > and restore the #ifdef in compiler_types.h.
> > 
> > Cc: Vlastimil Babka <vbabka@...e.cz>
> > Cc: Miguel Ojeda <ojeda@...nel.org>
> > Cc: Nick Desaulniers <ndesaulniers@...gle.com>
> > Cc: Andrew Morton <akpm@...ux-foundation.org>
> > Cc: Yonghong Song <yhs@...com>
> > Cc: Hao Luo <haoluo@...gle.com>
> > Cc: Marco Elver <elver@...gle.com>
> > Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> > Link: https://lore.kernel.org/lkml/CAMuHMdXK+UN1YVZm9DenuXAM8hZRUZJwp=SXsueP7sWiVU3a9A@mail.gmail.com
> > Fixes: 63caa04ec60583b1 ("slab: Remove __malloc attribute from realloc functions")
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> 
> Thanks, I decided to late squash it so we don't needlessly cause issues for
> people doing bisections with gcc-8 later.

Sounds good to me; thanks!

-- 
Kees Cook