On Tue, Jul 09, 2024 at 10:47:45PM -0400, Paul Moore wrote: > On Tue, Jul 9, 2024 at 10:40 PM Paul Moore <paul@xxxxxxxxxxxxxx> wrote: > > > > The LSM framework has an existing inode_free_security() hook which > > is used by LSMs that manage state associated with an inode, but > > due to the use of RCU to protect the inode, special care must be > > taken to ensure that the LSMs do not fully release the inode state > > until it is safe from a RCU perspective. > > > > This patch implements a new inode_free_security_rcu() implementation > > hook which is called when it is safe to free the LSM's internal inode > > state. Unfortunately, this new hook does not have access to the inode > > itself as it may already be released, so the existing > > inode_free_security() hook is retained for those LSMs which require > > access to the inode. > > > > Signed-off-by: Paul Moore <paul@xxxxxxxxxxxxxx> > > --- > > include/linux/lsm_hook_defs.h | 1 + > > security/integrity/ima/ima.h | 2 +- > > security/integrity/ima/ima_iint.c | 20 ++++++++------------ > > security/integrity/ima/ima_main.c | 2 +- > > security/landlock/fs.c | 9 ++++++--- > > security/security.c | 26 +++++++++++++------------- > > 6 files changed, 30 insertions(+), 30 deletions(-) > > FYI, this has only received "light" testing, and even that is fairly > generous. I booted up a system with IMA set to measure the TCB and > ran through the audit and SELinux test suites; IMA seemed to be > working just fine but I didn't poke at it too hard. I didn't have an > explicit Landlock test handy, but I'm hoping that the Landlock > enablement on a modern Rawhide system hit it a little :) If you want to test Landlock, you can do so like this: cd tools/testing/selftests/landlock make -C ../../../.. headers_install make for f in *_test; ./$f; done ...or you can build and run everything (on UML) with `./check-linux build kselftest' provided here: https://github.com/landlock-lsm/landlock-test-tools ...or, even simpler, you can run all checks by running `./docker-run.sh debian/sid` for instance. I need to update the kernel doc with these commands. > > -- > paul-moore.com >
