From: Pratyush Yadav <pratyush@kernel.org>
To: "David Hildenbrand (Arm)" <david@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Gregory Price <gourry@gourry.net>, Zi Yan <ziy@nvidia.com>,
Joshua Hahn <joshua.hahnjy@gmail.com>,
Rakie Kim <rakie.kim@sk.com>,
Ying Huang <ying.huang@linux.alibaba.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Vladimir Davydov <vdavydov.dev@gmail.com>,
Michal Hocko <mhocko@suse.com>, Hugh Dickins <hughd@google.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Lukas Czerner <lczerner@redhat.com>,
Carlos Maiolino <cmaiolino@redhat.com>,
Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>,
Daniel Verkamp <dverkamp@chromium.org>,
Jeff Xu <jeffxu@google.com>,
Muchun Song <muchun.song@linux.dev>,
Oscar Salvador <osalvador@suse.de>,
David Stevens <stevensd@chromium.org>,
"Matthew Wilcox (Oracle)" <willy@infradead.org>,
William Kucharski <william.kucharski@oracle.com>,
Chris Li <chrisl@kernel.org>, Kairui Song <kasong@tencent.com>,
Nhat Pham <nphamcs@gmail.com>,
Miaohe Lin <linmiaohe@huawei.com>,
Naoya Horiguchi <nao.horiguchi@gmail.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Chris Mason <mason@kernel.org>,
stable@vger.kernel.org, Pedro Falcato <pfalcato@suse.de>,
"Kiryl Shutsemau (Meta)" <kas@kernel.org>
Subject: Re: [PATCH v2 04/14] mm/shmem: honour F_SEAL_EXEC when an ACL is set
Date: Tue, 27 Oct 2026 18:34:18 +0100 [thread overview]
Message-ID: <2vxz7bj3oxnp.fsf@kernel.org> (raw)
In-Reply-To: <20261027-fixes_shmem-v2-4-86a00952acb9@kernel.org> (David Hildenbrand's message of "Tue, 27 Oct 2026 14:03:09 +0100")
On Tue, Oct 27 2026, David Hildenbrand (Arm) wrote:
> From: Chris Mason <mason@kernel.org>
>
> The owner of a memfd sealed with F_SEAL_EXEC can still change its
> execute bits by setting a POSIX access ACL. With CONFIG_TMPFS_POSIX_ACL,
> this lets an unprivileged owner make a non-executable memfd executable,
> bypassing vm.memfd_noexec=2.
>
> simple_set_acl() updates i_mode directly, bypassing the seal check in
> shmem_setattr(). Add shmem_set_acl() to check the resulting mode. Share
> the F_SEAL_EXEC check with shmem_setattr() using memfd_check_seals_mode()
> in include/linux/memfd.h.
>
> Fix generated by an LLM and sent by Chris Mason in private.
>
> Fixes: 6fd7353829ca ("mm/memfd: add F_SEAL_EXEC")
> Cc: stable@vger.kernel.org
> Signed-off-by: Chris Mason <mason@kernel.org>
> Acked-by: Pedro Falcato <pfalcato@suse.de>
> Acked-by: Kiryl Shutsemau (Meta) <kas@kernel.org>
> Acked-by: Zi Yan <ziy@nvidia.com>
> Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
> Tested-by: Gregory Price (Meta) <gourry@gourry.net>
> [ david: use common helper; simplify description ]
> Signed-off-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Pratyush Yadav (Google) <pratyush@kernel.org>
[...]
--
Regards,
Pratyush Yadav
next prev parent reply other threads:[~2026-10-27 17:34 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-27 13:03 [PATCH v2 00/14] mm/shmem: various (urgent?) fixes David Hildenbrand (Arm)
2026-10-27 13:03 ` [PATCH v2 01/14] mm/mempolicy: charge shared policy nodes David Hildenbrand (Arm)
2026-10-27 13:03 ` [PATCH v2 02/14] tmpfs: keep the quota soft limits of an unused id David Hildenbrand (Arm)
2026-10-27 13:03 ` [PATCH v2 03/14] tmpfs: preserve explicitly disabled quota limits David Hildenbrand (Arm)
2026-10-27 13:03 ` [PATCH v2 04/14] mm/shmem: honour F_SEAL_EXEC when an ACL is set David Hildenbrand (Arm)
2026-10-27 17:34 ` Pratyush Yadav [this message]
2026-10-27 13:03 ` [PATCH v2 05/14] hugetlbfs: enforce F_SEAL_EXEC in setattr David Hildenbrand (Arm)
2026-10-27 13:16 ` Muchun Song
2026-10-27 13:03 ` [PATCH v2 06/14] mm/shmem: stop retrying folios that cannot be split David Hildenbrand (Arm)
2026-10-27 13:03 ` [PATCH v2 07/14] mm/shmem: preserve data in clean folios when splitting fails David Hildenbrand (Arm)
2026-10-27 13:03 ` [PATCH v2 08/14] mm/shmem: discard whole new large folios on fallocate rollback David Hildenbrand (Arm)
2026-10-27 13:03 ` [PATCH v2 09/14] mm/shmem: rescan after nonuniform folio splitting David Hildenbrand (Arm)
2026-10-27 13:03 ` [PATCH v2 10/14] mm/shmem: fix truncate hang in large swap entry David Hildenbrand (Arm)
2026-10-27 13:03 ` [PATCH v2 11/14] mm/shmem: preserve allocation errors when swapping in large entries David Hildenbrand (Arm)
2026-10-27 13:03 ` [PATCH v2 12/14] mm/shmem: fix truncate loop after boundary swapin failure David Hildenbrand (Arm)
2026-10-27 13:03 ` [PATCH v2 13/14] mm/shmem: fix accounting of swapin-error markers David Hildenbrand (Arm)
2026-10-27 13:03 ` [PATCH v2 14/14] mm/shmem: fix truncation of files containing only " David Hildenbrand (Arm)
2026-10-27 13:20 ` [PATCH v2 00/14] mm/shmem: various (urgent?) fixes Baolin Wang
2026-10-27 13:27 ` David Hildenbrand (Arm)
2026-10-27 13:30 ` David Hildenbrand (Arm)
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