linux-kernel - Re: [PATCH v2] mm: vmalloc: Support more granular vrealloc() sizing

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Message-ID: <aAyyuCz6Y1bliBbn@pollux>
Date: Sat, 26 Apr 2025 12:17:28 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: Kees Cook <kees@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Erhard Furtner <erhard_f@...lbox.org>,
	Michal Hocko <mhocko@...e.com>, Vlastimil Babka <vbabka@...e.cz>,
	Uladzislau Rezki <urezki@...il.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2] mm: vmalloc: Support more granular vrealloc() sizing

On Fri, Apr 25, 2025 at 05:11:07PM -0700, Kees Cook wrote:
> Introduce struct vm_struct::requested_size so that the requested
> (re)allocation size is retained separately from the allocated area
> size. This means that KASAN will correctly poison the correct spans
> of requested bytes. This also means we can support growing the usable
> portion of an allocation that can already be supported by the existing
> area's existing allocation.
> 
> Reported-by: Erhard Furtner <erhard_f@...lbox.org>
> Closes: https://lore.kernel.org/all/20250408192503.6149a816@outsider.home/
> Fixes: 3ddc2fefe6f3 ("mm: vmalloc: implement vrealloc()")
> Signed-off-by: Kees Cook <kees@...nel.org>

Reviewed-by: Danilo Krummrich <dakr@...nel.org>