Linux 6.9 Released

17 May 2024 tags: audit lsm selinux

Linux v6.9 was released on Sunday, May 12th. I already wrote up a post highlighting the LSM, SELinux, and audit changes that were submitted during the merge window, however there were additional changes that went in during the release candidate process which are described below.

LSM

• Change the size_t parameter types in the new LSM syscalls to u32 to avoid differences between 32-bit and 64-bit systems. This change was backported to the Linux v6.8 stable kernel.

• Fix a problem where passing a NULL buffer into the lsm_get_self_attr(2) syscall via the ctx parameter resulted in an error. Passing a NULL buffer should result in success with the minimum necessary buffer size returned to the caller via the size parameter.

• Fix a problem caused during the IMA and EVM LSM promotion that could result in a kernel panic during certain mknod(2) operations.

SELinux

• Fix a problem where a failed selinuxfs mount could result in an invalid memory access.

In addition to my highlights, LWN.net provides a nice overall summary of the kernel changes made during the first and second weeks of the merge window.