From: sashiko-bot@kernel.org
To: "Mikhail Dmitrichenko" <mdmitrichenko@astralinux.ru>
Cc: linux-ext4@vger.kernel.org, tytso@mit.edu
Subject: Re: [PATCH 5.10] ext4: fix out-of-bounds read in ext4_read_inline_dir()
Date: Wed, 14 Oct 2026 16:11:44 +0000 [thread overview]
Message-ID: <sashiko-outbox-171517@kernel.org> (raw)
In-Reply-To: <20261014153817.239-1-mdmitrichenko@astralinux.ru>
> From: Xiang Mei <xmei5@asu.edu>
>
> commit 9333cc809f0a89e001b814155a6cb8903a6274df upstream.
>
> ext4_read_inline_dir() can read a dirent header past the end of its inline
> buffer, triggering a slab-out-of-bounds read during getdents64():
>
> BUG: KASAN: slab-out-of-bounds in __ext4_check_dir_entry
> Read of size 2 at addr ffff88800f3dd23c by task exploit/148
> ...
> __ext4_check_dir_entry
> ext4_read_inline_dir
> iterate_dir
>
> The dirent payload lives in a buffer of exactly inline_size bytes:
> [ ... ]
> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
> [ mdmitrichenko: use EXT4_DIR_REC_LEN(1) instead of
> ext4_dir_rec_len(1, NULL), which does not exist in 5.10; both compute
> the same minimal dirent length. ]
> Signed-off-by: Mikhail Dmitrichenko <mdmitrichenko@astralinux.ru>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20261014153817.239-1-mdmitrichenko@astralinux.ru?part=1
prev parent reply other threads:[~2026-10-14 16:11 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-14 15:38 [PATCH 5.10] ext4: fix out-of-bounds read in ext4_read_inline_dir() Mikhail Dmitrichenko
2026-10-14 16:11 ` sashiko-bot [this message]
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