linux-kernel - Re: [PATCH v2 2/2] slab: Remove special-casing of const 0 size allocations

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Date:   Mon, 21 Nov 2022 10:28:33 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Kees Cook <keescook@...omium.org>
Cc:     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>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2 2/2] slab: Remove special-casing of const 0 size
 allocations

On 11/18/22 18:06, Kees Cook wrote:
> On Fri, Nov 18, 2022 at 12:34:01PM +0100, Vlastimil Babka wrote:
>> On 11/18/22 04:51, Kees Cook wrote:
>> > Passing a constant-0 size allocation into kmalloc() or kmalloc_node()
>> > does not need to be a fast-path operation, so the static return value
>> > can be removed entirely. This is in preparation for making sure that
>> > all paths through the inlines result in a full extern function call,
>> 
>> So with the kmalloc_trace() already solved, we could now say it's not "in
>> preparation", but simply "makes sure", right? I can correct that while
>> picking this patch.
> 
> Yeah, good point. I missed this when updating the commit logs. Thanks!

Great, pushed to slab/for-6.2/alloc_size