CRED: Separate task security context from task_struct

Separate the task security context from task_struct.  At this point, the
security data is temporarily embedded in the task_struct with two pointers
pointing to it.

Note that the Alpha arch is altered as it refers to (E)UID and (E)GID in
entry.S via asm-offsets.

With comment fixes Signed-off-by: Marc Dionne <marc.c.dionne@gmail.com>

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 6 insertions, 4 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index c3b8b1fcde0d..733c59e645aa 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -345,7 +345,7 @@ static inline struct task_group *task_group(struct task_struct *p)
         struct task_group *tg;
 
 #ifdef CONFIG_USER_SCHED
-        tg = p->user->tg;
+        tg = p->cred->user->tg;
 #elif defined(CONFIG_CGROUP_SCHED)
         tg = container_of(task_subsys_state(p, cpu_cgroup_subsys_id),
                                 struct task_group, css);
@@ -5182,8 +5182,8 @@ recheck:
 
                 /* can't change other user's priorities */
                 euid = current_euid();
-                if (euid != p->euid &&
-                    euid != p->uid)
+                if (euid != p->cred->euid &&
+                    euid != p->cred->uid)
                         return -EPERM;
         }
 
@@ -5417,7 +5417,9 @@ long sched_setaffinity(pid_t pid, const cpumask_t *in_mask)
 
         euid = current_euid();
         retval = -EPERM;
-        if (euid != p->euid && euid != p->uid && !capable(CAP_SYS_NICE))
+        if (euid != p->cred->euid &&
+            euid != p->cred->uid &&
+            !capable(CAP_SYS_NICE))
                 goto out_unlock;
 
         retval = security_task_setscheduler(p, 0, NULL);