Vulnerability CVE-2023-52864

Vulnerability CVE-2023-52864

Published: 2024-05-21

Description:

In the Linux kernel, the following vulnerability has been resolved:

platform/x86: wmi: Fix opening of char device

Since commit fa1f68db6ca7 ("drivers: misc: pass miscdevice pointer via
file private data"), the miscdevice stores a pointer to itself inside
filp->private_data, which means that private_data will not be NULL when
wmi_char_open() is called. This might cause memory corruption should
wmi_char_open() be unable to find its driver, something which can
happen when the associated WMI device is deleted in wmi_free_devices().

Fix the problem by using the miscdevice pointer to retrieve the WMI
device data associated with a char device using container_of(). This
also avoids wmi_char_open() picking a wrong WMI device bound to a
driver with the same name as the original driver.

References:

https://git.kernel.org/stable/c/cf098e937dd125c0317a0d6f261ac2a950a233d6

https://git.kernel.org/stable/c/9fb0eed09e1470cd4021ff52b2b9dfcbcee4c203

https://git.kernel.org/stable/c/d426a2955e45a95b2282764105fcfb110a540453

https://git.kernel.org/stable/c/e0bf076b734a2fab92d8fddc2b8b03462eee7097

https://git.kernel.org/stable/c/44a96796d25809502c75771d40ee693c2e44724e

https://git.kernel.org/stable/c/36d85fa7ae0d6be651c1a745191fa7ef055db43e

https://git.kernel.org/stable/c/fb7b06b59c6887659c6ed0ecd3110835eecbb6a3

https://git.kernel.org/stable/c/eba9ac7abab91c8f6d351460239108bef5e7a0b6

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