selinux: compute the IMA configuration settings string length once at boot

selinux_ima_collect_state() builds a string of the current SELinux
configuration settings. The string lists each setting as a name and
one digit. The length of the string therefore never changes, but is
still recomputed on every call.

Add selinux_ima_config_len_init() to compute the length once during
selinux_init(). Update selinux_ima_collect_state() to use the stored
length.

Suggested-by: Paul Moore <paul@paul-moore.com>
Link: https://lore.kernel.org/r/df755e0282dab3b932d19aceab71b7d7@paul-moore.com
Signed-off-by: Ian Bridges <icb@fastmail.org>
Reviewed-by: Stephen Smalley <stephen.smalley.work@gmail.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

0 files changed, 0 insertions, 0 deletions