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Fri, 06 Nov 2026 01:14:31 -0800 (PST) Received: from anon-laptop ([103.187.196.159]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1b25e485ce2sm4200968c88.7.2026.11.06.01.14.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 06 Nov 2026 01:14:30 -0800 (PST) From: Wahid Khan To: Namjae Jeon , Hyunchul Lee Cc: ntfs@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Wahid Khan Subject: [PATCH 0/3] ntfs: three fixes for crafted images, found by fuzzing Date: Fri, 6 Nov 2026 14:44:17 +0530 Message-ID: <20261106091420.2461683-1-wahidzk0091@gmail.com> X-Mailer: git-send-email 2.56.0 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 Content-Transfer-Encoding: 8bit I fuzz the new fs/ntfs driver with mutated images: an image from mkntfs populated with ntfs-3g (directories, streams, sparse files, long names), a few bytes changed, then mount, walk the tree and write, under KASAN. Three problems from that are still present in ntfs-next (e62b384ca). Each patch has its own trace and the reproduction steps. 1. ntfs: do not read an index block outside $INDEX_ALLOCATION A directory without a usable $INDEX_ALLOCATION hangs on its first lookup. The task waits for an mft record lock that it already holds. It needs one changed byte in a crafted image. 2. ntfs: open the index allocation before reading or writing an index block NULL pointer dereference in ntfs_ib_write() on link() when the lookup ended in the index root. This is not the path fixed by 9365c4a1357e. It needs one changed byte in a crafted image. 3. ntfs: open a named $DATA stream by name when making room in a record WARN_ON() in ntfs_attr_make_non_resident(). This one does not need a damaged volume: a file with an alternate data stream and a full mft record is enough. All three need an image to be mounted, so a crafted image, not a remote attacker. I can send the images (about 380 KB each, compressed) if they are useful. Wahid Khan (3): ntfs: do not read an index block outside $INDEX_ALLOCATION ntfs: open the index allocation before reading or writing an index block ntfs: open a named $DATA stream by name when making room in a record fs/ntfs/attrib.c | 2 +- fs/ntfs/dir.c | 14 ++++++++++++++ fs/ntfs/index.c | 17 +++++++++++++++++ 3 files changed, 32 insertions(+), 1 deletion(-) -- 2.53.0