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 45F6E142E7E for ; Tue, 21 May 2024 15:25:06 +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=1716305106; cv=none; b=feUJ80JxJx9p4NnBVNLflZ/9kXR1fd6sjEGgao7TZ1Fp6LqPgR9ndlkZB4BnRzRPzqt2J4qL07S2CZ3eZg6wo9Hz3iHMuaasyTfDSCSxB5O+I/bpVQoDeTxDd63Ak4fsw9Y1BDAN/6/4xfE+3v6DMOWXTieaYe9WODGDVtgcaSE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716305106; c=relaxed/simple; bh=6nLvQ+6bJoLzO0hQtUWGS29PolpSIuGJsI11Bj8t4Og=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=gVvpAo0NiFPXkKYejSdGR5WR00ufROM0etZwIc6r2nvu8NTReqo43cnvjwrJwrhJEUztmG+fqvzLzkms78G2WzKt/FsN0mB1EnV9sDFZn3RXxHXseiAecf86a0Ddkmst5xgLomcf0jQwH5mCeDqYCS6Mq1u3LztssnUnwTR0D9E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=q3y/IJH4; 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="q3y/IJH4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B7D24C2BD11; Tue, 21 May 2024 15:25:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1716305106; bh=6nLvQ+6bJoLzO0hQtUWGS29PolpSIuGJsI11Bj8t4Og=; h=From:To:Cc:Subject:Date:Reply-to:From; b=q3y/IJH4gB74IDRZtXIaE4gtJu6+3HpQCEaluIcPaKsgCU93GSXEX9FJ8d+GpnTzA Lz8po4RZiOpiSazfC6ZMyducoBYXDhraXGZrhealA+72bGQacu8M+tAZdP2sGKoIYh YtyyU+D+eRvsS//0Gmq+A+HaXGzG4gifoDW68A5I= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2023-52733: s390/decompressor: specify __decompress() buf len to avoid overflow Date: Tue, 21 May 2024 17:23:10 +0200 Message-ID: <2024052159-CVE-2023-52733-601c@gregkh> X-Mailer: git-send-email 2.45.1 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=2769; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=6nLvQ+6bJoLzO0hQtUWGS29PolpSIuGJsI11Bj8t4Og=; b=owGbwMvMwCRo6H6F97bub03G02pJDGk+e4KFblssCoirb18+e2fw46+P/6W0VaY7bT7+47NGY XLBNLuDHbEsDIJMDLJiiixftvEc3V9xSNHL0PY0zBxWJpAhDFycAjCR3DkM8wN1e+oZOhxmqgjw 97n+OT8jvd/SgmHBxd0rTlddbb5nem9DmJYdf/V0I+NJAA== 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: s390/decompressor: specify __decompress() buf len to avoid overflow Historically calls to __decompress() didn't specify "out_len" parameter on many architectures including s390, expecting that no writes beyond uncompressed kernel image are performed. This has changed since commit 2aa14b1ab2c4 ("zstd: import usptream v1.5.2") which includes zstd library commit 6a7ede3dfccb ("Reduce size of dctx by reutilizing dst buffer (#2751)"). Now zstd decompression code might store literal buffer in the unwritten portion of the destination buffer. Since "out_len" is not set, it is considered to be unlimited and hence free to use for optimization needs. On s390 this might corrupt initrd or ipl report which are often placed right after the decompressor buffer. Luckily the size of uncompressed kernel image is already known to the decompressor, so to avoid the problem simply specify it in the "out_len" parameter. The Linux kernel CVE team has assigned CVE-2023-52733 to this issue. Affected and fixed versions =========================== Fixed in 5.4.232 with commit 16409f7d9ca5 Fixed in 5.10.169 with commit 55dbd6f4ea95 Fixed in 5.15.95 with commit 9ed522143f95 Fixed in 6.1.13 with commit f1eb22d0ff06 Fixed in 6.2 with commit 7ab41c2c08a3 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-2023-52733 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: arch/s390/boot/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/16409f7d9ca5bb8220e1049ea9aae0d3c94d2dfb https://git.kernel.org/stable/c/55dbd6f4ea954751340f4f73d5dcd7c8f12208b2 https://git.kernel.org/stable/c/9ed522143f959630f8b7782ddc212900d8f609a9 https://git.kernel.org/stable/c/f1eb22d0ff064ad458b3b1a1eaa84ac3996206c2 https://git.kernel.org/stable/c/7ab41c2c08a32132ba8c14624910e2fe8ce4ba4b