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 4DD8B16B395 for ; Wed, 21 Aug 2024 06:11:26 +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=1724220687; cv=none; b=fyNtPUZtF7SjFTjKZDBu95ZtZjLSNyYdrqx/Y/NRzTFFZb9a8IZ8qnatuUEGKW0G09lE5H4OTEbKEREdpPNFKBZEIwc19qcfEkgD3Hr0fHImh++tU8IXf0iTSMkpSMdNki4QhLqzaZWUrRkoRgavROOQ5og58JRHGdyvDhk5DqA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724220687; c=relaxed/simple; bh=68suVC0AZVhCUrdasqAC5Fz2fosh76zYN++FF6ian8w=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=eXiABrPz0q74NIZf+6bpk/OTXmJYooKGWGg+YpZLmvgXeBsNoyl1pD9RUpYY/Foz1OGUD2foWzVl6EZ/DFv+LDvfaaGu3xyBQTXDbrM/RYGcMIdPwz08czL228Xfu0l+DM2jtZTkWwKLL91vIX173+YrDYEuxaBiN3nBlmZZpS8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Dp6Yr81W; 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="Dp6Yr81W" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 742EBC32782; Wed, 21 Aug 2024 06:11:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1724220686; bh=68suVC0AZVhCUrdasqAC5Fz2fosh76zYN++FF6ian8w=; h=From:To:Cc:Subject:Date:Reply-to:From; b=Dp6Yr81WE9/JZF1nrr3z0HOCJ26VksTVtNMiRuxil9hXkHuQm/s80+IMoUhrEi8I2 iIbw2e+1IZHnyc0O7KZ/rMCn1UEM3jDSkfssz7lTQEvhW8TJjwzHhsJLB1Clo4+mXH XO9jikVrZIfAJEKVogp48LbApiWaf8dc2WFXB8fE= From: Greg Kroah-Hartman To: linux-cve-announce@vger.kernel.org Cc: Greg Kroah-Hartman Subject: CVE-2022-48867: dmaengine: idxd: Prevent use after free on completion memory Date: Wed, 21 Aug 2024 14:11:01 +0800 Message-ID: <2024082103-CVE-2022-48867-a428@gregkh> X-Mailer: git-send-email 2.46.0 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=2496; i=gregkh@linuxfoundation.org; h=from:subject:message-id; bh=68suVC0AZVhCUrdasqAC5Fz2fosh76zYN++FF6ian8w=; b=owGbwMvMwCRo6H6F97bub03G02pJDGlHW76/3tq6RffsjCDjoB0TX8ou/11zKMo7ff3ZzkPb2 J93eTeydsSyMAgyMciKKbJ82cZzdH/FIUUvQ9vTMHNYmUCGMHBxCsBEinYxzFP8LhK9/+ytbRNk twUt+90re79Yey7DgkOntzhOij04O+I0a3vQrMrXc7Nf1wIA 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: dmaengine: idxd: Prevent use after free on completion memory On driver unload any pending descriptors are flushed at the time the interrupt is freed: idxd_dmaengine_drv_remove() -> drv_disable_wq() -> idxd_wq_free_irq() -> idxd_flush_pending_descs(). If there are any descriptors present that need to be flushed this flow triggers a "not present" page fault as below: BUG: unable to handle page fault for address: ff391c97c70c9040 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page The address that triggers the fault is the address of the descriptor that was freed moments earlier via: drv_disable_wq()->idxd_wq_free_resources() Fix the use after free by freeing the descriptors after any possible usage. This is done after idxd_wq_reset() to ensure that the memory remains accessible during possible completion writes by the device. The Linux kernel CVE team has assigned CVE-2022-48867 to this issue. Affected and fixed versions =========================== Issue introduced in 5.19 with commit 63c14ae6c161 and fixed in 6.1.8 with commit b9e8e3fcfec6 Issue introduced in 5.19 with commit 63c14ae6c161 and fixed in 6.2 with commit 1beeec45f9ac 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-2022-48867 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/dma/idxd/device.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/b9e8e3fcfec625fc1c2f68f684448aeeb882625b https://git.kernel.org/stable/c/1beeec45f9ac31eba52478379f70a5fa9c2ad005