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>
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 07a9647..b23492e 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1110,12 +1110,12 @@
const unsigned long __user *old_nodes,
const unsigned long __user *new_nodes)
{
+ struct cred *cred, *tcred;
struct mm_struct *mm;
struct task_struct *task;
nodemask_t old;
nodemask_t new;
nodemask_t task_nodes;
- uid_t uid, euid;
int err;
err = get_nodes(&old, old_nodes, maxnode);
@@ -1145,10 +1145,10 @@
* capabilities, superuser privileges or the same
* userid as the target process.
*/
- uid = current_uid();
- euid = current_euid();
- if (euid != task->suid && euid != task->uid &&
- uid != task->suid && uid != task->uid &&
+ cred = current->cred;
+ tcred = task->cred;
+ if (cred->euid != tcred->suid && cred->euid != tcred->uid &&
+ cred->uid != tcred->suid && cred->uid != tcred->uid &&
!capable(CAP_SYS_NICE)) {
err = -EPERM;
goto out;