linux-hardening - Re: [PATCH v4 13/16] usercopy: Remove folio references from check_heap

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Message-ID: <202511241306.525D3248@keescook>
Date: Mon, 24 Nov 2025 13:06:27 -0800
From: Kees Cook <kees@...nel.org>
To: "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc: Vlastimil Babka <vbabka@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...two.org>,
	David Rientjes <rientjes@...gle.com>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Harry Yoo <harry.yoo@...cle.com>, linux-mm@...ck.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH v4 13/16] usercopy: Remove folio references from
 check_heap_object()

On Thu, Nov 13, 2025 at 12:09:27AM +0000, Matthew Wilcox (Oracle) wrote:
> Use page_slab() instead of virt_to_folio() followed by folio_slab().
> We do end up calling compound_head() twice for non-slab copies, but that
> will not be a problem once we allocate memdescs separately.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>

Reviewed-by: Kees Cook <kees@...nel.org>

-- 
Kees Cook