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 430F114658D for ; Thu, 1 May 2025 14:16:42 +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=1746109002; cv=none; b=dueFnf7Z3lNxx0rmg30STdFJF1YDj2iiHVTEWDFxTdb0W+hTy7VULwc6VZX91vCN7LSDqdtuSKicZJCuD739a2X5KsRS8sSwWujFzfij+Blsm5J9EHuvrYF7Cm3Lc8tC/SUJo/GByeawL6fx/UL675fM1/8GqLHHvNlXSdspDV4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746109002; c=relaxed/simple; bh=DxMDXsmwR3rvLM/1X20bqszIYcC+OEUuG9bWh2QUwE4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=bamWdSjXG11cpNotpUa6o2Yn0lv+8xTjOumq7MaXUV6Tebf/7Ipw0nCa6RtIVBWtPgqB2QUZYLfLl85Ndg0vN5HJTyDDthGHnize8NGn/F6QexSYB7Hf37D0nKhHZukAGkF1iEZR+JmPd+UguY1m7uzP5/0K/ljP4F73lME5e8o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=R+CBsiT8; 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="R+CBsiT8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 84486C4CEE3; Thu, 1 May 2025 14:16:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1746109002; bh=DxMDXsmwR3rvLM/1X20bqszIYcC+OEUuG9bWh2QUwE4=; h=From:To:Cc:Subject:Date:Reply-to:From; b=R+CBsiT88R5xs7A2U1QWdliDHckvBMDcZ2vJ4+LqtdhGFLtDIJFsXaOS7ELswtPlw I4LtCoToUxDRDBwju60Ic0/kekEWbOG81lINuVtQUt5HnjL3RpalCfEd2T6TIUScdZ a+IwlVXshcPZWAvKW3+hP93kFxkQPv0FgbOcYrkw= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2022-49879: ext4: fix BUG_ON() when directory entry has invalid rec_len Date: Thu, 1 May 2025 16:11:09 +0200 Message-ID: <2025050154-CVE-2022-49879-e897@gregkh> X-Mailer: git-send-email 2.49.0 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=2888; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=xEjJEz7FH1xeY44jrCuVP5weZ5660xMMq5BrttcfSa0=; b=owGbwMvMwCRo6H6F97bub03G02pJDBnCDZtyz5RKhzD/aNeqMb146MBSn+tRNwRfmJ8IUajvf dXQr3alI5aFQZCJQVZMkeXLNp6j+ysOKXoZ2p6GmcPKBDKEgYtTACYSuothQffhuHDRy3Ymj9cW nPYMfiG654OmFcMcrsvdW2qaX+6e2GAZ9a9skfbFsJTTAA== 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: ext4: fix BUG_ON() when directory entry has invalid rec_len The rec_len field in the directory entry has to be a multiple of 4. A corrupted filesystem image can be used to hit a BUG() in ext4_rec_len_to_disk(), called from make_indexed_dir(). ------------[ cut here ]------------ kernel BUG at fs/ext4/ext4.h:2413! ... RIP: 0010:make_indexed_dir+0x53f/0x5f0 ... Call Trace: ? add_dirent_to_buf+0x1b2/0x200 ext4_add_entry+0x36e/0x480 ext4_add_nondir+0x2b/0xc0 ext4_create+0x163/0x200 path_openat+0x635/0xe90 do_filp_open+0xb4/0x160 ? __create_object.isra.0+0x1de/0x3b0 ? _raw_spin_unlock+0x12/0x30 do_sys_openat2+0x91/0x150 __x64_sys_open+0x6c/0xa0 do_syscall_64+0x3c/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The fix simply adds a call to ext4_check_dir_entry() to validate the directory entry, returning -EFSCORRUPTED if the entry is invalid. The Linux kernel CVE team has assigned CVE-2022-49879 to this issue. Affected and fixed versions =========================== Fixed in 5.4.224 with commit 2fa24d0274fbf913b56ee31f15bc01168669d909 Fixed in 5.10.154 with commit 156451a67b93986fb07c274ef6995ff40766c5ad Fixed in 5.15.78 with commit 999cff2b6ce3b45c08abf793bf55534777421327 Fixed in 6.0.8 with commit ce1ee2c8827fb6493e91acbd50f664cf2a972c3d Fixed in 6.1 with commit 17a0bc9bd697f75cfdf9b378d5eb2d7409c91340 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-2022-49879 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/ext4/namei.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/2fa24d0274fbf913b56ee31f15bc01168669d909 https://git.kernel.org/stable/c/156451a67b93986fb07c274ef6995ff40766c5ad https://git.kernel.org/stable/c/999cff2b6ce3b45c08abf793bf55534777421327 https://git.kernel.org/stable/c/ce1ee2c8827fb6493e91acbd50f664cf2a972c3d https://git.kernel.org/stable/c/17a0bc9bd697f75cfdf9b378d5eb2d7409c91340