[RFC PATCH 0/9] Add LSM access controls and auditing to io_uring

Earlier this week Kumar Kartikeya Dwivedi posted a patchset switching io_uring over to the anonymous inode variant that allows for LSM controls. While nice, the patchset left the actual LSM controls as an exercise for the reader. The posting can be found using the lore link below: https://lore.kernel.org/io-uring/CAHC9VhS=PDxx=MzZnGGNLwo-o5Og-HGZe84=+BB... As fate would have it, I had been working on something very similar, in fact the two patches from Kumar mirrored two in my own patchset. This patchset, while still a bit crude, does include an attempt at adding the LSM and audit support necessary to properly implement LSM based access controls for io_uring. I've provided the SELinux implementation, Casey has been nice enough to provide a Smack patch, and John is working on an AppArmor patch as I write this. I've mentioned this work to the other LSM maintainers that I believe might be affected but I have not heard back from anyone else at this point. If any of the other LSMs would like to contribute a patch to this patchset I will happily accept it; I only ask that you post it to the LSM list and make sure I am on the To/CC line. I think it would be nice to try and wrap this up as soon as possible for the obvious reasons. The individual patches provide an explanation of the changes involved so I'm not going to repeat that here, but I will caution you that these patches are still rather crude, perhaps more than a RFC patchset should be, but it seemed prudent to move this along so I'm posting these now. Any review that you can provide would be helpful. Also, any pointers to easy-to-run io_uring tests would be helpful. I am particularly interested in tests which make use of the personality option, share urings across process boundaries, and make use of the sqpoll functionality. As a point of reference, this patchset is based on v5.13-rc2 and if you want to follow along via git I'll be making updates to the git tree/branch below (warning I will be force-pushing on this branch given the early/rough nature of these patches). git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux.git (checkout branch "working-io_uring") Thanks in advance, -Paul --- Casey Schaufler (1): Smack: Brutalist io_uring support with debug Paul Moore (8): audit: prepare audit_context for use in calling contexts beyond syscalls audit,io_uring,io-wq: add some basic audit support to io_uring audit: dev/test patch to force io_uring auditing audit: add filtering for io_uring records fs: add anon_inode_getfile_secure() similar to anon_inode_getfd_secure() io_uring: convert io_uring to the secure anon inode interface lsm,io_uring: add LSM hooks to io_uring selinux: add support for the io_uring access controls fs/anon_inodes.c | 29 ++ fs/io-wq.c | 4 + fs/io_uring.c | 25 +- include/linux/anon_inodes.h | 4 + include/linux/audit.h | 17 + include/linux/lsm_hook_defs.h | 5 + include/linux/lsm_hooks.h | 13 + include/linux/security.h | 16 + include/uapi/linux/audit.h | 4 +- kernel/audit.h | 7 +- kernel/auditfilter.c | 4 +- kernel/auditsc.c | 481 ++++++++++++++++++++++------ security/security.c | 12 + security/selinux/hooks.c | 67 ++++ security/selinux/include/classmap.h | 2 + security/smack/smack_lsm.c | 64 ++++ 16 files changed, 650 insertions(+), 104 deletions(-)