CRED: Wrap task credential accesses in the core kernel

Wrap access to task credentials so that they can be separated more easily from
the task_struct during the introduction of COW creds.

Change most current->(|e|s|fs)[ug]id to current_(|e|s|fs)[ug]id().

Change some task->e?[ug]id to task_e?[ug]id().  In some places it makes more
sense to use RCU directly rather than a convenient wrapper; these will be
addressed by later patches.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: James Morris <jmorris@namei.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-audit@redhat.com
Cc: containers@lists.linux-foundation.org
Cc: linux-mm@kvack.org
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 3 insertions, 4 deletions

diff --git a/kernel/acct.c b/kernel/acct.c
index f6006a60df5d..d57b7cbb98b6 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -530,15 +530,14 @@ static void do_acct_process(struct bsd_acct_struct *acct,
         do_div(elapsed, AHZ);
         ac.ac_btime = get_seconds() - elapsed;
         /* we really need to bite the bullet and change layout */
-        ac.ac_uid = current->uid;
-        ac.ac_gid = current->gid;
+        current_uid_gid(&ac.ac_uid, &ac.ac_gid);
 #if ACCT_VERSION==2
         ac.ac_ahz = AHZ;
 #endif
 #if ACCT_VERSION==1 || ACCT_VERSION==2
         /* backward-compatible 16 bit fields */
-        ac.ac_uid16 = current->uid;
-        ac.ac_gid16 = current->gid;
+        ac.ac_uid16 = ac.ac_uid;
+        ac.ac_gid16 = ac.ac_gid;
 #endif
 #if ACCT_VERSION==3
         ac.ac_pid = task_tgid_nr_ns(current, ns);