From: Joe Perches <joe@perches.com>
To: Kees Cook <keescook@chromium.org>
Cc: linux-kernel@vger.kernel.org,
Daniel Micay <danielmicay@gmail.com>,
Christoph Lameter <cl@linux.com>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>,
linux-mm@kvack.org, Miguel Ojeda <ojeda@kernel.org>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Dennis Zhou <dennis@kernel.org>, Tejun Heo <tj@kernel.org>,
Masahiro Yamada <masahiroy@kernel.org>,
Michal Marek <michal.lkml@markovi.net>,
clang-built-linux@googlegroups.com, linux-kbuild@vger.kernel.org,
linux-hardening@vger.kernel.org
Subject: Re: [PATCH 2/5] slab: Add __alloc_size attributes for better bounds checking
Date: Tue, 17 Aug 2021 23:30:52 -0700 [thread overview]
Message-ID: <c408a8ef7173671d6d220c4eaedc8fec8693bef5.camel@perches.com> (raw)
In-Reply-To: <202108172312.7032A3E@keescook>
On Tue, 2021-08-17 at 23:16 -0700, Kees Cook wrote:
> On Tue, Aug 17, 2021 at 10:31:32PM -0700, Joe Perches wrote:
> > On Tue, 2021-08-17 at 22:08 -0700, Kees Cook wrote:
> > > As already done in GrapheneOS, add the __alloc_size attribute for
> > > regular kmalloc interfaces, to provide additional hinting for better
> > > bounds checking, assisting CONFIG_FORTIFY_SOURCE and other compiler
> > > optimizations.
[]
> > Lastly __alloc_size should probably be added to checkpatch
>
> Oh, yes! Thanks for the reminder.
>
> > Maybe:
> > ---
> > scripts/checkpatch.pl | 3 ++-
> > 1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> > index 161ce7fe5d1e5..1a166b5cf3447 100755
> > --- a/scripts/checkpatch.pl
> > +++ b/scripts/checkpatch.pl
> > @@ -489,7 +489,8 @@ our $Attribute = qr{
> > ____cacheline_aligned|
> > ____cacheline_aligned_in_smp|
> > ____cacheline_internodealigned_in_smp|
> > - __weak
> > + __weak|
> > + __alloc_size\s*\(\s*\d+\s*(?:,\s*d+\s*){0,5}\)
>
> Why the "{0,5}" bit here? I was expecting just "?". (i.e. it can have
> either 1 or 2 arguments.)
You are right. I misread the doc. I also missed a \ before the last d.
So that last added line should maybe be: (totally untested btw)
+ __alloc_size\s*\(\s*\d+\s*(?:,\s*\d+\s*)?\)
next prev parent reply other threads:[~2021-08-18 6:31 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-18 5:08 [PATCH 0/5] Add __alloc_size() for better bounds checking Kees Cook
2021-08-18 5:08 ` [PATCH 1/5] Compiler Attributes: " Kees Cook
2021-08-18 13:07 ` Miguel Ojeda
2021-08-18 17:58 ` Kees Cook
2021-08-18 18:04 ` Nathan Chancellor
2021-08-18 21:04 ` Kees Cook
2021-08-18 5:08 ` [PATCH 2/5] slab: Add __alloc_size attributes " Kees Cook
2021-08-18 5:31 ` Joe Perches
2021-08-18 6:16 ` Kees Cook
2021-08-18 6:30 ` Joe Perches [this message]
2021-08-19 0:27 ` Matthew Wilcox
2021-08-19 1:10 ` Joe Perches
2021-08-19 2:16 ` Matthew Wilcox
2021-08-19 2:59 ` Joe Perches
2021-08-18 5:08 ` [PATCH 3/5] mm/page_alloc: " Kees Cook
2021-08-18 5:08 ` [PATCH 4/5] percpu: " Kees Cook
2021-08-18 5:08 ` [PATCH 5/5] mm/vmalloc: " Kees Cook
2021-08-19 9:09 ` [PATCH 0/5] Add __alloc_size() " Christoph Hellwig
2021-08-19 14:18 ` Daniel Micay
2021-08-25 10:01 ` Christoph Lameter
2021-08-25 16:34 ` Kees Cook
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