Merge branches 'core/futexes', 'core/locking', 'core/rcu' and 'linus' into core/urgent

[linux-2.6-omap-h63xx.git] / kernel / futex.c

diff --git a/kernel/futex.c b/kernel/futex.c
index 206d4c906885c8d60d99d64e15eb21daba4406ec..002aa189eb09ae0d66617f3236e4f53e31913547 100644 (file)
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -409,13 +409,20 @@ static void free_pi_state(struct futex_pi_state *pi_state)
 static struct task_struct * futex_find_get_task(pid_t pid)
 {
        struct task_struct *p;
+       const struct cred *cred = current_cred(), *pcred;
 
        rcu_read_lock();
        p = find_task_by_vpid(pid);
-       if (!p || ((current->euid != p->euid) && (current->euid != p->uid)))
+       if (!p) {
                p = ERR_PTR(-ESRCH);
-       else
-               get_task_struct(p);
+       } else {
+               pcred = __task_cred(p);
+               if (cred->euid != pcred->euid &&
+                   cred->euid != pcred->uid)
+                       p = ERR_PTR(-ESRCH);
+               else
+                       get_task_struct(p);
+       }
 
        rcu_read_unlock();
 
@@ -1755,6 +1762,7 @@ sys_get_robust_list(int pid, struct robust_list_head __user * __user *head_ptr,
 {
        struct robust_list_head __user *head;
        unsigned long ret;
+       const struct cred *cred = current_cred(), *pcred;
 
        if (!futex_cmpxchg_enabled)
                return -ENOSYS;
@@ -1770,8 +1778,10 @@ sys_get_robust_list(int pid, struct robust_list_head __user * __user *head_ptr,
                if (!p)
                        goto err_unlock;
                ret = -EPERM;
-               if ((current->euid != p->euid) && (current->euid != p->uid) &&
-                               !capable(CAP_SYS_PTRACE))
+               pcred = __task_cred(p);
+               if (cred->euid != pcred->euid &&
+                   cred->euid != pcred->uid &&
+                   !capable(CAP_SYS_PTRACE))
                        goto err_unlock;
                head = p->robust_list;
                rcu_read_unlock();