LSM: Infrastructure management of the superblock

mainline inclusion
from mainline-v5.13-rc1
commit 1aea7808
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6DJU0
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1aea7808372eee4ad01f98e064c88c57f1e94855



--------------------------------

Move management of the superblock->sb_security blob out of the
individual security modules and into the security infrastructure.
Instead of allocating the blobs from within the modules, the modules
tell the infrastructure how much space is required, and the space is
allocated there.

Cc: John Johansen <john.johansen@canonical.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Mickaël Salaün <mic@linux.microsoft.com>
Reviewed-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210422154123.13086-6-mic@digikod.net


Signed-off-by: James Morris <jamorris@linux.microsoft.com>

conflicts:
	security/selinux/hooks.c
	security/selinux/ss/services.c

Signed-off-by: Yi Yang <yiyang13@huawei.com>