linux-kernel - Re: [PATCH v2 23/23] mm/sl[au]b: check if large object is valid in _

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Date:   Thu, 14 Apr 2022 11:58:01 +0200 (CEST)
From:   Christoph Lameter <cl@...two.de>
To:     Hyeonggon Yoo <42.hyeyoo@...il.com>
cc:     Vlastimil Babka <vbabka@...e.cz>, Marco Elver <elver@...gle.com>,
        Matthew WilCox <willy@...radead.org>,
        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>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 23/23] mm/sl[au]b: check if large object is valid in
 __ksize()

On Thu, 14 Apr 2022, Hyeonggon Yoo wrote:

> If address of large object is not beginning of folio or size of
> the folio is too small, it must be invalid. Return zero in such cases.

This looks like a slab usage error on the part of the caller that would
benefit from a kernel log entry. A warning or an error?