CRED: Wrap task credential accesses in the IA64 arch

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: Tony Luck <tony.luck@intel.com>
Cc: linux-ia64@vger.kernel.org
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 13 insertions, 10 deletions

diff --git a/arch/ia64/kernel/perfmon.c b/arch/ia64/kernel/perfmon.c
index 6543a5547c84..dd38db46a77a 100644
--- a/arch/ia64/kernel/perfmon.c
+++ b/arch/ia64/kernel/perfmon.c
@@ -2220,8 +2220,8 @@ pfm_alloc_file(pfm_context_t *ctx)
         DPRINT(("new inode ino=%ld @%p\n", inode->i_ino, inode));
 
         inode->i_mode = S_IFCHR|S_IRUGO;
-        inode->i_uid  = current->fsuid;
-        inode->i_gid  = current->fsgid;
+        inode->i_uid  = current_fsuid();
+        inode->i_gid  = current_fsgid();
 
         sprintf(name, "[%lu]", inode->i_ino);
         this.name = name;
@@ -2399,22 +2399,25 @@ error_kmem:
 static int
 pfm_bad_permissions(struct task_struct *task)
 {
+        uid_t uid = current_uid();
+        gid_t gid = current_gid();
+
         /* inspired by ptrace_attach() */
         DPRINT(("cur: uid=%d gid=%d task: euid=%d suid=%d uid=%d egid=%d sgid=%d\n",
-                current->uid,
-                current->gid,
+                uid,
+                gid,
                 task->euid,
                 task->suid,
                 task->uid,
                 task->egid,
                 task->sgid));
 
-        return ((current->uid != task->euid)
-            || (current->uid != task->suid)
-            || (current->uid != task->uid)
-            || (current->gid != task->egid)
-            || (current->gid != task->sgid)
-            || (current->gid != task->gid)) && !capable(CAP_SYS_PTRACE);
+        return (uid != task->euid)
+            || (uid != task->suid)
+            || (uid != task->uid)
+            || (gid != task->egid)
+            || (gid != task->sgid)
+            || (gid != task->gid)) && !capable(CAP_SYS_PTRACE);
 }
 
 static int