linux-kernel - Re: [PATCH v3 2/3] mmap: Fix error paths with dup_anon

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <eca412f9-b642-48c8-f0ba-b02c0b7cefad@suse.cz>
Date:   Mon, 2 Oct 2023 09:11:02 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Jann Horn <jannh@...gle.com>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Matthew Wilcox <willy@...radead.org>, stable@...r.kernel.org
Subject: Re: [PATCH v3 2/3] mmap: Fix error paths with dup_anon_vma()

On 9/29/23 20:30, Liam R. Howlett wrote:
> When the calling function fails after the dup_anon_vma(), the
> duplication of the anon_vma is not being undone.  Add the necessary
> unlink_anon_vma() call to the error paths that are missing them.
> 
> This issue showed up during inspection of the error path in vma_merge()
> for an unrelated vma iterator issue.
> 
> Users may experience increased memory usage, which may be problematic as
> the failure would likely be caused by a low memory situation.
> 
> Fixes: d4af56c5c7c6 ("mm: start tracking VMAs with maple tree")
> Cc: stable@...r.kernel.org
> Cc: Jann Horn <jannh@...gle.com>
> Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>