Re: [PATCH v4 6/20] lsm: Refactor return value of LSM hook getselfattr

[Paul Moore <paul@paul-moore.com>]

On Jul 11, 2024 Xu Kuohai <xukuohai@huaweicloud.com> 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 <xukuohai@huawei.com>
> ---
>  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