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Vulnerability CVE-2024-35952
Published: 2024-05-20
| Description: |
In the Linux kernel, the following vulnerability has been resolved:
drm/ast: Fix soft lockup
There is a while-loop in ast_dp_set_on_off() that could lead to
infinite-loop. This is because the register, VGACRI-Dx, checked in
this API is a scratch register actually controlled by a MCU, named
DPMCU, in BMC.
These scratch registers are protected by scu-lock. If suc-lock is not
off, DPMCU can not update these registers and then host will have soft
lockup due to never updated status.
DPMCU is used to control DP and relative registers to handshake with
host's VGA driver. Even the most time-consuming task, DP's link
training, is less than 100ms. 200ms should be enough. |
References: |
https://git.kernel.org/stable/c/8a6fea3fcb577a543ef67683ca7105bde49a38fb
https://git.kernel.org/stable/c/a81b2acd43e24e419f65df97348c76a5a1496066
https://git.kernel.org/stable/c/35768baf0fdfc47ede42d899506bad78450e9294
https://git.kernel.org/stable/c/bc004f5038220b1891ef4107134ccae44be55109
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