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Message-ID: <2024022821-CVE-2020-36787-7efe@gregkh> Date: Wed, 28 Feb 2024 09:14:25 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: gregkh@...nel.org Subject: CVE-2020-36787: media: aspeed: fix clock handling logic From: gregkh@...nel.org Description =========== In the Linux kernel, the following vulnerability has been resolved: media: aspeed: fix clock handling logic Video engine uses eclk and vclk for its clock sources and its reset control is coupled with eclk so the current clock enabling sequence works like below. Enable eclk De-assert Video Engine reset 10ms delay Enable vclk It introduces improper reset on the Video Engine hardware and eventually the hardware generates unexpected DMA memory transfers that can corrupt memory region in random and sporadic patterns. This issue is observed very rarely on some specific AST2500 SoCs but it causes a critical kernel panic with making a various shape of signature so it's extremely hard to debug. Moreover, the issue is observed even when the video engine is not actively used because udevd turns on the video engine hardware for a short time to make a query in every boot. To fix this issue, this commit changes the clock handling logic to make the reset de-assertion triggered after enabling both eclk and vclk. Also, it adds clk_unprepare call for a case when probe fails. clk: ast2600: fix reset settings for eclk and vclk Video engine reset setting should be coupled with eclk to match it with the setting for previous Aspeed SoCs which is defined in clk-aspeed.c since all Aspeed SoCs are sharing a single video engine driver. Also, reset bit 6 is defined as 'Video Engine' reset in datasheet so it should be de-asserted when eclk is enabled. This commit fixes the setting. The Linux kernel CVE team has assigned CVE-2020-36787 to this issue. Affected and fixed versions =========================== Issue introduced in 5.0 with commit d3d04f6c330a and fixed in 5.4.119 with commit 1dc1d30ac101 Issue introduced in 5.0 with commit d3d04f6c330a and fixed in 5.10.37 with commit a59d01384c80 Issue introduced in 5.0 with commit d3d04f6c330a and fixed in 5.11.21 with commit 2964c37563e8 Issue introduced in 5.0 with commit d3d04f6c330a and fixed in 5.12.4 with commit 75321dc8aebe Issue introduced in 5.0 with commit d3d04f6c330a and fixed in 5.13 with commit 3536169f8531 Please see https://www.kernel.org or 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-2020-36787 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/clk/clk-ast2600.c drivers/media/platform/aspeed-video.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/1dc1d30ac101bb8335d9852de2107af60c2580e7 https://git.kernel.org/stable/c/a59d01384c80a8a4392665802df57c3df20055f5 https://git.kernel.org/stable/c/2964c37563e86cfdc439f217eb3c5a69adfdba6a https://git.kernel.org/stable/c/75321dc8aebe3f30eff226028fe6da340fe0bf02 https://git.kernel.org/stable/c/3536169f8531c2c5b153921dc7d1ac9fd570cda7
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