linux-hardening - Re: [PATCH 2/5] slab: Add __alloc_size attributes for better bounds checking

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Message-ID: <YR2+/WBa9eVGn0bp@casper.infradead.org>
Date:   Thu, 19 Aug 2021 03:16:29 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Joe Perches <joe@...ches.com>
Cc:     Jonathan Corbet <corbet@....net>,
        linux-doc <linux-doc@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        linux-kernel@...r.kernel.org, Daniel Micay <danielmicay@...il.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
        Miguel Ojeda <ojeda@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        clang-built-linux@...glegroups.com, linux-kbuild@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH 2/5] slab: Add __alloc_size attributes for better bounds
 checking

On Wed, Aug 18, 2021 at 06:10:57PM -0700, Joe Perches wrote:
> On Thu, 2021-08-19 at 01:27 +0100, Matthew Wilcox wrote:
> > On Tue, Aug 17, 2021 at 10:31:32PM -0700, Joe Perches wrote:
> > > Lastly __alloc_size should probably be added to checkpatch
> > > 
> > > Maybe:
> > > ---
> > >  scripts/checkpatch.pl | 3 ++-
> > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > > 
> > > diff --git 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*\(\s*\d+\s*(?:,\s*d+\s*){0,5}\)
> > 
> > Should probably be added to kernel-doc as well.  Any other awful regexes
> > that need to be changed to understand it?  And can we commonise the
> > regexes that do exist into a perl helper library?
> 
> probably, but there would need to be some library work done and
> changes made to both utilities so they could use the same $helpers.
> 
> And there are several nominally incomplete regexes already in
> kernel-doc and I'm not at all familiar with kernel-doc.

Yes, kernel-doc is an awful example of perl gone wild.