audit: add fchmodat2() to change attributes class

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: audit: add fchmodat2() to change attributes class fchmodat2(), introduced in version 6.6 is currently not in the change attribute class of audit. Calling fchmodat2() to change a file attribute in the same fashion than chmod() or fchmodat() will bypass audit rules such as: -w /tmp/test -p rwa -k test_rwa The current patch adds fchmodat2() to the change attributes class.

References

• https://git.kernel.org/stable/c/91e27bc79c3bca93c06bf5a471d47df9a35b3741
• https://git.kernel.org/stable/c/3e762a03713e8c25ca0108c075d662c897fc0623
• https://git.kernel.org/stable/c/4fed776ca86378da7dd743a7b648e20b025ba8ef
• https://git.kernel.org/stable/c/c4334c0d0e7d6f02ed93756fd4ba807e3d00c05f
• https://git.kernel.org/stable/c/4f493a6079b588cf1f04ce5ed6cdad45ab0d53dc
• https://www.bencteux.fr/posts/missing_syscalls_audit/