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 B7F7A1AAE1D for ; Thu, 20 Jun 2024 10:57:14 +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=1718881034; cv=none; b=Bn3aearm3EPZXK45cmKW7suA44Zk+q0hjtlRppJjvGnpnfxKFvh0nYO/pLfM8Ys9jhREfy8cJDi+neFkT08qY/VuIKhesnQk+m5p4DiVr214712A2DKF5DZiiydB3o0hPfp298iy5hwFgy/SqGLpimjAZAt+juuWtr9LTtDorLc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718881034; c=relaxed/simple; bh=fepyQMGuUxIJHHAAMn3Faax526375px4b8Lyau7eD6Q=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=oowP302ntMz2XGEDSrTMGT3Io0yAuFlf3ljKTT7TkgfMw+BJ5ldaBdRkdTHdyAD4zmWSaCXDZj5A6fVZFIQilbt79JrZrV9KNdje1I56Xs6oAnxiI6ZHdVTnsUyOED9pkcVcTqXCprfq9vtCdI09GSWSfgEzKpi62mA7qx5Up+8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Yr0XvUpX; 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="Yr0XvUpX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 00D2FC2BD10; Thu, 20 Jun 2024 10:57:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1718881034; bh=fepyQMGuUxIJHHAAMn3Faax526375px4b8Lyau7eD6Q=; h=From:To:Cc:Subject:Date:Reply-to:From; b=Yr0XvUpXT6QCXtqFsPrk4n01I9c7rOKiHFn2nJ2fM1Av4Zozp3snntbRrP+0hjmSE HLSYzI+bSW0LQGoQ148P5Z1B6Gn4ghU7tlyF6K2E/h8avDVQnTdObo/1cUgZNIDeAP HDMTqF+LhYM5ymZ9wQfiR65DQG6T/j5NWVRfbt1I= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2021-47617: PCI: pciehp: Fix infinite loop in IRQ handler upon power fault Date: Thu, 20 Jun 2024 12:57:06 +0200 Message-ID: <2024062005-CVE-2021-47617-da02@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=3528; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=fepyQMGuUxIJHHAAMn3Faax526375px4b8Lyau7eD6Q=; b=owGbwMvMwCRo6H6F97bub03G02pJDGkl3IwKWqsK/VrjCpZ6t3YfXLd/+kKLG0e49tYr/pRYf MG45khbRywLgyATg6yYIsuXbTxH91ccUvQytD0NM4eVCWQIAxenAExEJZthfoymz+2Hosz1/y2v RL2J6vOqtk9YxjA/a9nL6Gu2bDZ3Hyy7fPxj/CmPedu/AgA= 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: PCI: pciehp: Fix infinite loop in IRQ handler upon power fault The Power Fault Detected bit in the Slot Status register differs from all other hotplug events in that it is sticky: It can only be cleared after turning off slot power. Per PCIe r5.0, sec. 6.7.1.8: If a power controller detects a main power fault on the hot-plug slot, it must automatically set its internal main power fault latch [...]. The main power fault latch is cleared when software turns off power to the hot-plug slot. The stickiness used to cause interrupt storms and infinite loops which were fixed in 2009 by commits 5651c48cfafe ("PCI pciehp: fix power fault interrupt storm problem") and 99f0169c17f3 ("PCI: pciehp: enable software notification on empty slots"). Unfortunately in 2020 the infinite loop issue was inadvertently reintroduced by commit 8edf5332c393 ("PCI: pciehp: Fix MSI interrupt race"): The hardirq handler pciehp_isr() clears the PFD bit until pciehp's power_fault_detected flag is set. That happens in the IRQ thread pciehp_ist(), which never learns of the event because the hardirq handler is stuck in an infinite loop. Fix by setting the power_fault_detected flag already in the hardirq handler. The Linux kernel CVE team has assigned CVE-2021-47617 to this issue. Affected and fixed versions =========================== Issue introduced in 4.19.149 with commit a8cc52270f3d and fixed in 4.19.233 with commit ff27f7d0333c Issue introduced in 5.4.69 with commit 4667358dab9c and fixed in 5.4.177 with commit 464da38ba827 Issue introduced in 5.7 with commit 8edf5332c393 and fixed in 5.10.97 with commit 3b4c966fb156 Issue introduced in 5.7 with commit 8edf5332c393 and fixed in 5.15.20 with commit 1db58c6584a7 Issue introduced in 5.7 with commit 8edf5332c393 and fixed in 5.16.6 with commit 6d6f1f0dac3e Issue introduced in 5.7 with commit 8edf5332c393 and fixed in 5.17 with commit 23584c1ed3e1 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-2021-47617 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: drivers/pci/hotplug/pciehp_hpc.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/ff27f7d0333cff89ec85c419f431aca1b38fb16a https://git.kernel.org/stable/c/464da38ba827f670deac6500a1de9a4f0f44c41d https://git.kernel.org/stable/c/3b4c966fb156ff3e70b2526d964952ff7c1574d9 https://git.kernel.org/stable/c/1db58c6584a72102e98af2e600ea184ddaf2b8af https://git.kernel.org/stable/c/6d6f1f0dac3e3441ecdb1103d4efb11b9ed24dd5 https://git.kernel.org/stable/c/23584c1ed3e15a6f4bfab8dc5a88d94ab929ee12