From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ED3B825B0AB; Tue, 21 Jul 2026 22:20:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784672406; cv=none; b=rTV4RqEw5yZ1cYkZwe8sR2ruGIQBxOGOwN5Dv6+b0Mcbj1TEPLEQQbW6a5y9E8QgMHVUHrBNER60BSqN/F0P2fGoqeo4gXvRix4z7FeUfG/uDfwh8cc7/mwRAipOfcYrycc1LZtfy1vxN460B5b99/p3TXseyfISJ9fbcoNl1/8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784672406; c=relaxed/simple; bh=E+uh6EE6PFKB4WA+VUqGEk1Xlz0sRtTAQ6eZ5bdAlKc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=UhkNHPihnahdf/DCyq16jFydbXEaEVWzIr8hhjrFIwJ0T4g4n5TPI5lmNJ9oQLJM03BY6CcUULF5tp02k6A9m338EERLL5O5PJZZn/5govRCRAnZu/jystE8hbd0He387oSIbLgLEBblRl9xiYg95oRrypxrGiBfKwxqFhh6r2E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=QQ+on03v; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="QQ+on03v" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1330A1F000E9; Tue, 21 Jul 2026 22:20:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784672404; bh=4P1Ieh1rC/DSmcpEk7rnjbHCAYmO+02OLMNIMjKk7SY=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=QQ+on03vyXm7P7IIsr8yNS21llQ284kA3PCguX/cDkB6E2XTwXUmERtOHM//sYd7V mg1qPhBECVjl2l66oqJu7m5w1fv4jL8TUy0SFsO/SiNOHJX6vqXBFi4OXuiBTWjZWG pjkyA4HtDnoTYJcBw1+PQBHZSoAPL7mgEo1qlo84= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Michael Bommarito , Konstantin Komarov Subject: [PATCH 5.15 612/843] fs/ntfs3: bound attr_off in UpdateResidentValue against data_off Date: Tue, 21 Jul 2026 17:24:07 +0200 Message-ID: <20260721152419.821310110@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Konstantin Komarov commit d1570c48f49a693974d000251030370ee2e83539 upstream. In do_action()'s UpdateResidentValue case (fslog.c:3307), lrh->attr_off and lrh->redo_len come from the on-disk LRH. When they satisfy aoff + dlen < attr->res.data_off, the assignment attr->res.data_size = cpu_to_le32(aoff + dlen - data_off); underflows to ~4 GiB (e.g. 0xFFFFFFF9 when aoff=0x10, dlen=1, data_off=0x18). Subsequent code that reads attr->res.data_size to walk the resident attribute payload would then read up to 4 GiB past the 1024-byte MFT record allocation. The existing mi_enum_attr() defense in fs/ntfs3/record.c:287 catches the corrupted data_size on the next attribute walk and fails the mount, but only on the path that walks all attributes. A read site that picks an attribute by name and reads its data_size without re-validating is not covered. Validate aoff against data_off and asize at the source. Reproduced under UML+KASAN on mainline 8d90b09e6741 via pr_warn-only probe: with aoff=0x10 and data_off=0x18, the post-assignment data_size is 0xfffffff9 (mount then fails at -22 from mi_enum_attr). Fixes: b46acd6a6a62 ("fs/ntfs3: Add NTFS journal") Cc: stable@vger.kernel.org Assisted-by: Claude:claude-opus-4-7 Signed-off-by: Michael Bommarito [almaz.alexandrovich@paragon-software.com: clang-formatted the changes] Signed-off-by: Konstantin Komarov Signed-off-by: Greg Kroah-Hartman --- fs/ntfs3/fslog.c | 11 +++++++++++ 1 file changed, 11 insertions(+) --- a/fs/ntfs3/fslog.c +++ b/fs/ntfs3/fslog.c @@ -3316,6 +3316,17 @@ skip_load_parent: nsize = ALIGN(nsize, 8); data_off = le16_to_cpu(attr->res.data_off); + /* + * aoff comes from the on-disk lrh->attr_off. Forbid + * writes that begin below the resident attribute's + * data_off (which would overwrite the resident header), + * and forbid aoff + dlen < data_off, which would make + * the data_size assignment below underflow to ~4 GiB. + */ + if (aoff < data_off || aoff + dlen < data_off || + aoff + dlen > asize) + goto dirty_vol; + if (nsize < asize) { memmove(Add2Ptr(attr, aoff), data, dlen); data = NULL; // To skip below memmove().