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 A38111AAE04 for ; Thu, 20 Jun 2024 11:17:55 +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=1718882275; cv=none; b=mKsthCID34E8U61DXn3W1OAKxpYv8y0VYw4DJEkjbSevJYcDQCh6eeCr+AgfpUUgdHSvuBTcw/FW7TS4FLbNYYbOq8EmB9Ci3NKrVgfqi7wNXFaM+29c06u+2kuGK/FrAOoQxVSvse2kznc0kMrawZHknWW8UiFI+pqQUM0PC+g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718882275; c=relaxed/simple; bh=NBXneMA4o51l7pdgin4FTkdmVlxp3VX6+MOt5RoQLm4=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=rkwZsyuSUFDUxi1MSAvJF0iWOsodMQu7L8FgxiqEz0AeH9zEUuUO4gyBa9QCbVOp79T1V37whNoOpO5WU2Nzx2SjkCB5QK618klyqmvQw4A/W976VM8EKPVWPyHnikH948yqSqeg2N7KBqpVUD7KbqRIZJr5zgHq/bWvOGOsIPo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=mTdwhZGb; 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="mTdwhZGb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2BF8DC2BD10; Thu, 20 Jun 2024 11:17:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1718882275; bh=NBXneMA4o51l7pdgin4FTkdmVlxp3VX6+MOt5RoQLm4=; h=From:To:Cc:Subject:Date:Reply-to:From; b=mTdwhZGbKCMTChL3NqHRn55wG0cZFAb3Z+kXOBRzenYQmm3Tdnx+hCxocxHRKgY0Y KlQOW6RSBD/eOgiAxEPBiozUGw7ScKJ3hhGjjgzRR+kqbVQdccUfYbsaI4r9feh3vK Eh3vWnBHTdomuoNN2+10uS4WlW14yuILaVJDtPR0= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2022-48751: net/smc: Transitional solution for clcsock race issue Date: Thu, 20 Jun 2024 13:16:31 +0200 Message-ID: <2024062005-CVE-2022-48751-10d0@gregkh> X-Mailer: git-send-email 2.45.2 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=2908; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=NBXneMA4o51l7pdgin4FTkdmVlxp3VX6+MOt5RoQLm4=; b=owGbwMvMwCRo6H6F97bub03G02pJDGkl/KVOMyKfmu+52zcpvlGl/HD+cq7dBmvmiF9I+aF6W Ncl9LRyRywLgyATg6yYIsuXbTxH91ccUvQytD0NM4eVCWQIAxenAEzkSB/Dgm6z79PUt26csLcn zFv6U4rr8cQ9rAwLbpyY92WJ3j8O/4zS5nVn5jA32IqbAQA= 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: net/smc: Transitional solution for clcsock race issue We encountered a crash in smc_setsockopt() and it is caused by accessing smc->clcsock after clcsock was released. BUG: kernel NULL pointer dereference, address: 0000000000000020 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 1 PID: 50309 Comm: nginx Kdump: loaded Tainted: G E 5.16.0-rc4+ #53 RIP: 0010:smc_setsockopt+0x59/0x280 [smc] Call Trace: __sys_setsockopt+0xfc/0x190 __x64_sys_setsockopt+0x20/0x30 do_syscall_64+0x34/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f16ba83918e This patch tries to fix it by holding clcsock_release_lock and checking whether clcsock has already been released before access. In case that a crash of the same reason happens in smc_getsockopt() or smc_switch_to_fallback(), this patch also checkes smc->clcsock in them too. And the caller of smc_switch_to_fallback() will identify whether fallback succeeds according to the return value. The Linux kernel CVE team has assigned CVE-2022-48751 to this issue. Affected and fixed versions =========================== Issue introduced in 5.1 with commit fd57770dd198 and fixed in 5.15.19 with commit 38f0bdd548fd Issue introduced in 5.1 with commit fd57770dd198 and fixed in 5.16.5 with commit 4284225cd800 Issue introduced in 5.1 with commit fd57770dd198 and fixed in 5.17 with commit c0bf3d8a943b Issue introduced in 4.19.299 with commit d1d004585b40 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-2022-48751 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: net/smc/af_smc.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/38f0bdd548fd2ef5d481b88d8a2bfef968452e34 https://git.kernel.org/stable/c/4284225cd8001e134f5cf533a7cd244bbb654d0f https://git.kernel.org/stable/c/c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760