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Sat, 24 Oct 2026 08:43:53 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Date: Sat, 24 Oct 2026 08:43:53 -0400 From: "Alejandro Pacheco" To: "Richard Weinberger" Cc: "Zhihao Cheng" , "Miquel Raynal" , "Vignesh Raghavendra" , linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org Message-Id: <67a5dbbb-911a-4f24-b862-9dae24f958e0@alepacheco.dev> In-Reply-To: <6083713b-4c4e-4e17-93c5-61f3bb7a77f1@alepacheco.dev> References: <6083713b-4c4e-4e17-93c5-61f3bb7a77f1@alepacheco.dev> Subject: [PATCH 2/2] ubi: Check the data size of the last LEB of static volumes Content-Type: text/plain Content-Transfer-Encoding: 7bit From: Alejandro Pacheco For a static volume, init_volumes() takes the data size of its last LEB from the attach information, av->last_data_size, as vol->last_eb_bytes. When the volume is first opened, ubi_check_volume() reads that many bytes of the last LEB into a buffer of vol->usable_leb_size bytes. Nothing bounds that size by vol->usable_leb_size. When UBI attaches by scanning, it is the data_size of the last LEB's VID header, which validate_vid_hdr() only checks against ubi->leb_size; that is larger than the usable LEB size of a volume with a non-zero data_pad. When UBI attaches from a fastmap, it can be the last_eb_bytes of the volume's fastmap header, which is not checked at all. A larger size makes ubi_check_volume() write past the end of its buffer. Before UBI comes up, check_attaching_info() runs check_av() on every volume that has attach information, to check it against the volume's record in the volume table. Also reject there a static volume whose last LEB data size is negative or larger than vol->usable_leb_size. Images written by UBI or ubinize are not affected: no LEB of a static volume holds more data than its usable LEB size. This needs a crafted image (the VID header and the fastmap carry CRCs that catch random corruption) on a device that UBI attaches at boot or that a user with CAP_SYS_RESOURCE attaches. An LLM coding assistant was used to find this bug and to write this patch and its changelog. Fixes: 801c135ce73d ("UBI: Unsorted Block Images") Cc: stable@vger.kernel.org Signed-off-by: Alejandro Pacheco --- drivers/mtd/ubi/vtbl.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/mtd/ubi/vtbl.c b/drivers/mtd/ubi/vtbl.c index 06d87a3013a..f1bd6e1e488 100644 --- a/drivers/mtd/ubi/vtbl.c +++ b/drivers/mtd/ubi/vtbl.c @@ -696,6 +696,12 @@ static int check_av(const struct ubi_volume *vol, err = 5; goto bad; } + if (vol->vol_type == UBI_STATIC_VOLUME && + (av->last_data_size < 0 || + av->last_data_size > vol->usable_leb_size)) { + err = 6; + goto bad; + } return 0; bad: