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 59BA821771F for ; Wed, 26 Feb 2025 02:14:40 +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=1740536080; cv=none; b=AgChvnQdBba358PDmOsrleS8t9lpny9FXTJf/YT8yXKsRJzNuf3wl+wHh9xXcvc9t5FPBbvv0xjjSbMXTMskazWcUWZkMKVIEq5GHj46Vvc4Ce+hA7x9d8vWMQ2Q22kw2wUZ+yV25gt2p+Y4URuhxr2MBxALLVTiKvB4JEFlW0o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740536080; c=relaxed/simple; bh=+cd/4X3Wps0VzcQ7Nq1u2kAyN21bNB6V4Q/TLNUMhUc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=Jz1pSWighP18WENyppIrVnjGhltLcNCE4xscBLmFWUXT7kE1Ldnnb+kFjTfBh3P/94BoP2JjfkLPclSMSHXiOXyDWrtCyKvOuHxTYoUV5/FM/sZZB7NkWyT1Fkxn1KXSfbBGAKExbYA+kWK82BhTbuTipxozBHdOKSHP9WLPkeo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Ohz8Kxj3; 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="Ohz8Kxj3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 30480C4CEE6; Wed, 26 Feb 2025 02:14:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1740536080; bh=+cd/4X3Wps0VzcQ7Nq1u2kAyN21bNB6V4Q/TLNUMhUc=; h=From:To:Cc:Subject:Date:Reply-to:From; b=Ohz8Kxj3vllzf1IUimX9HEuSnrJfjsijjUacyXzWDk8DAYnH7Slr1FUyszcHeGTRl MDDU3Nzw5BeGaNBifQPY65PRCeRoW7Wf76hXJzk+OTtkz64wVXvXQ9xOoqOHiQglJJ f+9z2ZRCIxkbR9+4JKF8hfPk4IaTsE+2KgR2iL6g= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2022-49464: erofs: fix buffer copy overflow of ztailpacking feature Date: Wed, 26 Feb 2025 03:12:18 +0100 Message-ID: <2025022601-CVE-2022-49464-7407@gregkh> X-Mailer: git-send-email 2.48.1 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=2965; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=+cd/4X3Wps0VzcQ7Nq1u2kAyN21bNB6V4Q/TLNUMhUc=; b=owGbwMvMwCRo6H6F97bub03G02pJDOn7yn+2fz7Eo8MqGrX2oUW3Kl979qV7PasWmS/8+X2JV LmzSc7ZjlgWBkEmBlkxRZYv23iO7q84pOhlaHsaZg4rE8gQBi5OAZiIxi6GeebfTc4w+JjovddZ UcOolm4en/ByMsOCCdWng35/v5e3dPnjiiRLvdLJ10reAQA= X-Developer-Key: i=gregkh@linuxfoundation.org; a=openpgp; fpr=F4B60CC5BF78C2214A313DCB3147D40DDB2DFB29 Content-Transfer-Encoding: 8bit Description =========== In the Linux kernel, the following vulnerability has been resolved: erofs: fix buffer copy overflow of ztailpacking feature I got some KASAN report as below: [ 46.959738] ================================================================== [ 46.960430] BUG: KASAN: use-after-free in z_erofs_shifted_transform+0x2bd/0x370 [ 46.960430] Read of size 4074 at addr ffff8880300c2f8e by task fssum/188 ... [ 46.960430] Call Trace: [ 46.960430] [ 46.960430] dump_stack_lvl+0x41/0x5e [ 46.960430] print_report.cold+0xb2/0x6b7 [ 46.960430] ? z_erofs_shifted_transform+0x2bd/0x370 [ 46.960430] kasan_report+0x8a/0x140 [ 46.960430] ? z_erofs_shifted_transform+0x2bd/0x370 [ 46.960430] kasan_check_range+0x14d/0x1d0 [ 46.960430] memcpy+0x20/0x60 [ 46.960430] z_erofs_shifted_transform+0x2bd/0x370 [ 46.960430] z_erofs_decompress_pcluster+0xaae/0x1080 The root cause is that the tail pcluster won't be a complete filesystem block anymore. So if ztailpacking is used, the second part of an uncompressed tail pcluster may not be ``rq->pageofs_out``. The Linux kernel CVE team has assigned CVE-2022-49464 to this issue. Affected and fixed versions =========================== Issue introduced in 5.17 with commit ab749badf9f41f32509cd103391b81ea7e684b76 and fixed in 5.17.14 with commit 4d53a625f29074e7b8236c2c0e0922edb7608df9 Issue introduced in 5.17 with commit ab749badf9f41f32509cd103391b81ea7e684b76 and fixed in 5.18.3 with commit 6b59e1907f58cf877c563dcf013159eb9f994b64 Issue introduced in 5.17 with commit ab749badf9f41f32509cd103391b81ea7e684b76 and fixed in 5.19 with commit dcbe6803fffd387f72b48c2373b5f5ed12a5804b 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-2022-49464 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/erofs/decompressor.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/4d53a625f29074e7b8236c2c0e0922edb7608df9 https://git.kernel.org/stable/c/6b59e1907f58cf877c563dcf013159eb9f994b64 https://git.kernel.org/stable/c/dcbe6803fffd387f72b48c2373b5f5ed12a5804b