On Jan 15, 2024 Roberto Sassu <[email protected]> wrote: > > In preparation for moving IMA and EVM to the LSM infrastructure, introduce > the inode_post_removexattr hook. > > At inode_removexattr hook, EVM verifies the file's existing HMAC value. At > inode_post_removexattr, EVM re-calculates the file's HMAC with the passed > xattr removed and other file metadata. > > Other LSMs could similarly take some action after successful xattr removal. > > The new hook cannot return an error and cannot cause the operation to be > reverted. > > Signed-off-by: Roberto Sassu <[email protected]> > Reviewed-by: Stefan Berger <[email protected]> > Reviewed-by: Mimi Zohar <[email protected]> > Reviewed-by: Casey Schaufler <[email protected]> > --- > fs/xattr.c | 9 +++++---- > include/linux/lsm_hook_defs.h | 2 ++ > include/linux/security.h | 5 +++++ > security/security.c | 14 ++++++++++++++ > 4 files changed, 26 insertions(+), 4 deletions(-)
Acked-by: Paul Moore <[email protected]> -- paul-moore.com
