CVE-2022-49640 Information

Description

In the Linux kernel the following vulnerability has been resolved:

sysctl: Fix data races in proc_douintvec_minmax().

A sysctl variable is accessed concurrently and there is always a chance of data-race. So all readers and writers need some basic protection to avoid load/store-tearing.

This patch changes proc_douintvec_minmax() to use READ_ONCE() and WRITE_ONCE() internally to fix data-races on the sysctl side. For now proc_douintvec_minmax() itself is tolerant to a data-race but we still need to add annotations on the other subsystem’s side.

Reference

https://git.kernel.org/stable/c/2d3b559df3ed39258737789aae2ae7973d205bc1 https://git.kernel.org/stable/c/40e0477a7371d101c55b69d9c32a7a1ed82ab5ea https://git.kernel.org/stable/c/b60eddf98b9716651069dfda296c91311a7a6293 https://git.kernel.org/stable/c/e3a2144b3b6bf9ecafd91087c8b8b48171ec19df