linux-kernel - Re: [PATCH 01/12] slab: Introduce kmalloc_size

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Message-ID: <202209231145.7654767ED5@keescook>
Date:   Fri, 23 Sep 2022 11:50:37 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Feng Tang <feng.tang@...el.com>, Vlastimil Babka <vbabka@...e.cz>
Cc:     Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Alex Elder <elder@...nel.org>,
        Josef Bacik <josef@...icpanda.com>,
        David Sterba <dsterba@...e.com>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian K??nig <christian.koenig@....com>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        Daniel Micay <danielmicay@...il.com>,
        Yonghong Song <yhs@...com>, Marco Elver <elver@...gle.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
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        "llvm@...ts.linux.dev" <llvm@...ts.linux.dev>,
        "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>
Subject: Re: [PATCH 01/12] slab: Introduce kmalloc_size_roundup()

On Fri, Sep 23, 2022 at 09:17:25AM +0800, Feng Tang wrote:
> On Thu, Sep 22, 2022 at 07:12:21PM +0800, Hyeonggon Yoo wrote:
> > On Wed, Sep 21, 2022 at 08:10:02PM -0700, Kees Cook wrote:
> > > [...]
> > > Introduce kmalloc_size_roundup(), to serve this function so we can start
> > > replacing the "anticipatory resizing" uses of ksize().
> > [...]
> >
> > This looks okay.
> > [...]
> > Cc-ing Feng Tang who may welcome this series ;)
>  
> Indeed! This will help our work of extending slub redzone check,
> as we also ran into some trouble with ksize() users when extending
> the redzone support to this extra allocated space than requested
> size [1], and have to disable the redzone sanity for all ksize()
> users [2].
> 
> [1]. https://lore.kernel.org/lkml/20220719134503.GA56558@shbuild999.sh.intel.com/
> [2]. https://lore.kernel.org/lkml/20220913065423.520159-5-feng.tang@intel.com/

Thanks for the feedback! I'll send my v2 series -- I'm hoping at least
this patch can land in v6.1 so the various other patches would be clear
to land via their separate trees, etc.

-- 
Kees Cook