From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 BF7F82580E2 for ; Sat, 30 Aug 2025 09:19:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756545552; cv=none; b=jdYtPBusZMXFr4K3ChQ85UR0GGxZY4tKQnzOIyTU841hNOLeSOQkga696dxBN9P71pgFJyU+e8geak8+DefuO1n3Ggx0OkhU9QQ9CZ6i7Uq/ASI6HDkrfV9gAZ5j14Nh9oz0f5pTmc2n/AeqCJoj33XwsVIqcNDINAw1LN69Ajw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756545552; c=relaxed/simple; bh=hJs+XX45W+aj2g+//l46vfzSeBgg9qaCO6dfMBczu6k=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=InptkmrDgTlGdtaukNNhAlQXLbrRubCkFneX4EGwa+ME64vUy7qY2mC0bpjL20krsfoa2OawiyeZyBSv9DwLPknORbb0AgdOIkCvk+OxsHeftN9I/XyN4iapgZXulYseV6TBm9S4efxS1uXpvAZ86CBebWUMNKz3g4HyzWTnHFw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=JAhb3luP; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="JAhb3luP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D93DAC4CEEB; Sat, 30 Aug 2025 09:19:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756545551; bh=hJs+XX45W+aj2g+//l46vfzSeBgg9qaCO6dfMBczu6k=; h=From:To:Cc:Subject:Date:Reply-to:From; b=JAhb3luPy28vcWBGLRocNRuXqNFEJ1rlEIQjiyNgtzkRaaTpeHW8+LWVxA5IWLqhA R4fHve3TWZu9IDeUZGNwmnVb18OXT9oS8NOYa0ODsQeAeKzquDU8s+6vD6lSMcg51/ uvbedgdLP4WNYUGS3a1xaqTRYyuHT7C37b6Pl/4g= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2025-38677: f2fs: fix to avoid out-of-boundary access in dnode page Date: Sat, 30 Aug 2025 11:19:06 +0200 Message-ID: <2025083005-CVE-2025-38677-e495@gregkh> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-cve-announce@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Reply-to: , X-Developer-Signature: v=1; a=openpgp-sha256; l=3992; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=g0NBLhIdX9W7dECid5mp9TVqUXs4E3kfGFIJXLaTS8U=; b=owGbwMvMwCRo6H6F97bub03G02pJDBmbDnE+Z9OpWKP3jVXDolW+YuVJxdf2gW8aJ9lm/Hwh0 9R2JMekI5aFQZCJQVZMkeXLNp6j+ysOKXoZ2p6GmcPKBDKEgYtTACbSf45hwYnQfv05G9PYa9ZM vvJG24Q5xzegkGF+SXpEfs/MjbJFCnO5O5p/2UcZ7O8EAA== X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit From: Greg Kroah-Hartman Description =========== In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid out-of-boundary access in dnode page As Jiaming Zhang reported: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x1c1/0x2a0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x17e/0x800 mm/kasan/report.c:480 kasan_report+0x147/0x180 mm/kasan/report.c:593 data_blkaddr fs/f2fs/f2fs.h:3053 [inline] f2fs_data_blkaddr fs/f2fs/f2fs.h:3058 [inline] f2fs_get_dnode_of_data+0x1a09/0x1c40 fs/f2fs/node.c:855 f2fs_reserve_block+0x53/0x310 fs/f2fs/data.c:1195 prepare_write_begin fs/f2fs/data.c:3395 [inline] f2fs_write_begin+0xf39/0x2190 fs/f2fs/data.c:3594 generic_perform_write+0x2c7/0x910 mm/filemap.c:4112 f2fs_buffered_write_iter fs/f2fs/file.c:4988 [inline] f2fs_file_write_iter+0x1ec8/0x2410 fs/f2fs/file.c:5216 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x546/0xa90 fs/read_write.c:686 ksys_write+0x149/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x3d0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The root cause is in the corrupted image, there is a dnode has the same node id w/ its inode, so during f2fs_get_dnode_of_data(), it tries to access block address in dnode at offset 934, however it parses the dnode as inode node, so that get_dnode_addr() returns 360, then it tries to access page address from 360 + 934 * 4 = 4096 w/ 4 bytes. To fix this issue, let's add sanity check for node id of all direct nodes during f2fs_get_dnode_of_data(). The Linux kernel CVE team has assigned CVE-2025-38677 to this issue. Affected and fixed versions =========================== Fixed in 5.4.297 with commit ee4d13f5407cbdf1216cc258f45492075713889a Fixed in 5.10.241 with commit a650654365c57407413e9b1f6ff4d539bf2e99ca Fixed in 5.15.190 with commit 6b7784ea07e6aa044f74b39d6b5af5e28746fc81 Fixed in 6.1.149 with commit 901f62efd6e855f93d8b1175540f29f4dc45ba55 Fixed in 6.6.103 with commit 92ef491b506a0f4dd971a3a76f86f2d8f5370180 Fixed in 6.12.44 with commit 888aa660144bcb6ec07839da756ee46bfcf7fc53 Fixed in 6.16.4 with commit f1d5093d9fe9f3c74c123741c88666cc853b79c5 Fixed in 6.17-rc1 with commit 77de19b6867f2740cdcb6c9c7e50d522b47847a4 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2025-38677 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: fs/f2fs/node.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/ee4d13f5407cbdf1216cc258f45492075713889a https://git.kernel.org/stable/c/a650654365c57407413e9b1f6ff4d539bf2e99ca https://git.kernel.org/stable/c/6b7784ea07e6aa044f74b39d6b5af5e28746fc81 https://git.kernel.org/stable/c/901f62efd6e855f93d8b1175540f29f4dc45ba55 https://git.kernel.org/stable/c/92ef491b506a0f4dd971a3a76f86f2d8f5370180 https://git.kernel.org/stable/c/888aa660144bcb6ec07839da756ee46bfcf7fc53 https://git.kernel.org/stable/c/f1d5093d9fe9f3c74c123741c88666cc853b79c5 https://git.kernel.org/stable/c/77de19b6867f2740cdcb6c9c7e50d522b47847a4