CVE - CVE-2020-36787

CVE-ID
CVE-2020-36787	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/1dc1d30ac101bb8335d9852de2107af60c2580e7 URL:https://git.kernel.org/stable/c/1dc1d30ac101bb8335d9852de2107af60c2580e7 MISC:https://git.kernel.org/stable/c/2964c37563e86cfdc439f217eb3c5a69adfdba6a URL:https://git.kernel.org/stable/c/2964c37563e86cfdc439f217eb3c5a69adfdba6a MISC:https://git.kernel.org/stable/c/3536169f8531c2c5b153921dc7d1ac9fd570cda7 URL:https://git.kernel.org/stable/c/3536169f8531c2c5b153921dc7d1ac9fd570cda7 MISC:https://git.kernel.org/stable/c/75321dc8aebe3f30eff226028fe6da340fe0bf02 URL:https://git.kernel.org/stable/c/75321dc8aebe3f30eff226028fe6da340fe0bf02 MISC:https://git.kernel.org/stable/c/a59d01384c80a8a4392665802df57c3df20055f5 URL:https://git.kernel.org/stable/c/a59d01384c80a8a4392665802df57c3df20055f5
Assigning CNA
kernel.org
Date Record Created
20240226	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240226)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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