CVE-2024-36960

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

drm/vmwgfx: Fix invalid reads in fence signaled events

Correctly set the length of the drm_event to the size of the structure thats actually used.

The length of the drm_event was set to the parent structure instead of to the drm_vmw_event_fence which is supposed to be read. drm_read uses the length parameter to copy the event to the user space thus resuling in oob reads.

Weakness

The product reads data past the end, or before the beginning, of the intended buffer.

Affected Software

Potential Mitigations

• Assume all input is malicious. Use an “accept known good” input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
• When performing input validation, consider all potentially relevant properties, including length, type of input, the full range of acceptable values, missing or extra inputs, syntax, consistency across related fields, and conformance to business rules. As an example of business rule logic, “boat” may be syntactically valid because it only contains alphanumeric characters, but it is not valid if the input is only expected to contain colors such as “red” or “blue.”
• Do not rely exclusively on looking for malicious or malformed inputs. This is likely to miss at least one undesirable input, especially if the code’s environment changes. This can give attackers enough room to bypass the intended validation. However, denylists can be useful for detecting potential attacks or determining which inputs are so malformed that they should be rejected outright.
• To reduce the likelihood of introducing an out-of-bounds read, ensure that you validate and ensure correct calculations for any length argument, buffer size calculation, or offset. Be especially careful of relying on a sentinel (i.e. special character such as NUL) in untrusted inputs.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/540.html

References

• https://git.kernel.org/stable/c/0dbfc73670b357456196130551e586345ca48e1b
• https://git.kernel.org/stable/c/2f527e3efd37c7c5e85e8aa86308856b619fa59f
• https://git.kernel.org/stable/c/3cd682357c6167f636aec8ac0efaa8ba61144d36
• https://git.kernel.org/stable/c/7b5fd3af4a250dd0a2a558e07b43478748eb5d22
• https://git.kernel.org/stable/c/a37ef7613c00f2d72c8fc08bd83fb6cc76926c8c
• https://git.kernel.org/stable/c/b7bab33c4623c66e3398d5253870d4e88c52dfc0
• https://git.kernel.org/stable/c/cef0962f2d3e5fd0660c8efb72321083a1b531a9
• https://git.kernel.org/stable/c/deab66596dfad14f1c54eeefdb72428340d72a77
• https://lists.debian.org/debian-lts-announce/2024/06/msg00019.html
• https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html