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, 4 insertions, 2 deletions

diff --git a/kernel/futex.c b/kernel/futex.c
index e06962132aaf..28421d8210b8 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -443,7 +443,8 @@ static struct task_struct * futex_find_get_task(pid_t pid)
 
         rcu_read_lock();
         p = find_task_by_vpid(pid);
-        if (!p || (euid != p->euid && euid != p->uid))
+        if (!p || (euid != p->cred->euid &&
+                   euid != p->cred->uid))
                 p = ERR_PTR(-ESRCH);
         else
                 get_task_struct(p);
@@ -1846,7 +1847,8 @@ sys_get_robust_list(int pid, struct robust_list_head __user * __user *head_ptr,
                 if (!p)
                         goto err_unlock;
                 ret = -EPERM;
-                if (euid != p->euid && euid != p->uid &&
+                if (euid != p->cred->euid &&
+                    euid != p->cred->uid &&
                     !capable(CAP_SYS_PTRACE))
                         goto err_unlock;
                 head = p->robust_list;