On Jul 11, 2024 Xu Kuohai [off-list ref] wrote:

To be consistent with most LSM hooks, convert the return value of
hook getselfattr to 0 or a negative error code.

Before:
- Hook getselfattr returns number of attributes found on success
  or a negative error code on failure.

After:
- Hook getselfattr returns 0 on success or a negative error code
  on failure. An output parameter @nattr is introduced to hold
  the number of attributes found on success.

Signed-off-by: Xu Kuohai <redacted>
---
 include/linux/lsm_hook_defs.h |  2 +-
 include/linux/security.h      |  5 +++--
 security/apparmor/lsm.c       |  5 +++--
 security/lsm_syscalls.c       |  6 +++++-
 security/security.c           | 18 +++++++++++-------
 security/selinux/hooks.c      | 13 +++++++++----
 security/smack/smack_lsm.c    | 13 +++++++++----
 7 files changed, 41 insertions(+), 21 deletions(-)

The getselfattr hook is different from the majority of the other LSM
hooks as getselfattr is used as part of lsm_get_self_attr(2) syscall and
not by other subsystems within the kernel.  Let's leave it as-is for now
as it is sufficiently special case that a deviation is okay.

--
paul-moore.com