Vulnerability CVE-2024-41027
Published: 2024-07-29

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

Fix userfaultfd_api to return EINVAL as expected

Currently if we request a feature that is not set in the Kernel config we
fail silently and return all the available features. However, the man
page indicates we should return an EINVAL.

We need to fix this issue since we can end up with a Kernel warning should
a program request the feature UFFD_FEATURE_WP_UNPOPULATED on a kernel with
the config not set with this feature.

[ 200.812896] WARNING: CPU: 91 PID: 13634 at mm/memory.c:1660 zap_pte_range+0x43d/0x660
[ 200.820738] Modules linked in:
[ 200.869387] CPU: 91 PID: 13634 Comm: userfaultfd Kdump: loaded Not tainted 6.9.0-rc5+ #8
[ 200.877477] Hardware name: Dell Inc. PowerEdge R6525/0N7YGH, BIOS 2.7.3 03/30/2022
[ 200.885052] RIP: 0010:zap_pte_range+0x43d/0x660

 References:
https://git.kernel.org/stable/c/519547760f16eae7803d2658d9524bc5ba7a20a7
https://git.kernel.org/stable/c/14875fd5f9bcf60ac5518c63bfb676ade44aa7c6
https://git.kernel.org/stable/c/cd94cac4069a763ab5206be2c64c9a8beae590ba
https://git.kernel.org/stable/c/8111f902b7c95d75fc80c7e577f5045886c6b384
https://git.kernel.org/stable/c/1723f04caacb32cadc4e063725d836a0c4450694
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