pid namespaces: changes to show virtual ids to user

[linux-2.6-block.git] / kernel / futex.c

diff --git a/kernel/futex.c b/kernel/futex.c
index e45a65e41686c19e599140e0c4e04de5203f5bee..86b2600381b616db0d157ac9e172a3fc55315be4 100644 (file)
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -53,6 +53,9 @@
 #include <linux/signal.h>
 #include <linux/module.h>
 #include <linux/magic.h>
+#include <linux/pid.h>
+#include <linux/nsproxy.h>
+
 #include <asm/futex.h>
 
 #include "rtmutex_common.h"
@@ -443,7 +446,8 @@ static struct task_struct * futex_find_get_task(pid_t pid)
        struct task_struct *p;
 
        rcu_read_lock();
-       p = find_task_by_pid(pid);
+       p = find_task_by_pid_ns(pid,
+                       current->nsproxy->pid_ns);
 
        if (!p || ((current->euid != p->euid) && (current->euid != p->uid)))
                p = ERR_PTR(-ESRCH);
@@ -653,7 +657,7 @@ static int wake_futex_pi(u32 __user *uaddr, u32 uval, struct futex_q *this)
        if (!(uval & FUTEX_OWNER_DIED)) {
                int ret = 0;
 
-               newval = FUTEX_WAITERS | new_owner->pid;
+               newval = FUTEX_WAITERS | task_pid_vnr(new_owner);
 
                curval = cmpxchg_futex_value_locked(uaddr, uval, newval);
 
@@ -1106,7 +1110,7 @@ static void unqueue_me_pi(struct futex_q *q)
 static int fixup_pi_state_owner(u32 __user *uaddr, struct futex_q *q,
                                struct task_struct *curr)
 {
-       u32 newtid = curr->pid | FUTEX_WAITERS;
+       u32 newtid = task_pid_vnr(curr) | FUTEX_WAITERS;
        struct futex_pi_state *pi_state = q->pi_state;
        u32 uval, curval, newval;
        int ret;
@@ -1368,7 +1372,7 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
         * (by doing a 0 -> TID atomic cmpxchg), while holding all
         * the locks. It will most likely not succeed.
         */
-       newval = current->pid;
+       newval = task_pid_vnr(current);
 
        curval = cmpxchg_futex_value_locked(uaddr, 0, newval);
 
@@ -1379,7 +1383,7 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
         * Detect deadlocks. In case of REQUEUE_PI this is a valid
         * situation and we return success to user space.
         */
-       if (unlikely((curval & FUTEX_TID_MASK) == current->pid)) {
+       if (unlikely((curval & FUTEX_TID_MASK) == task_pid_vnr(current))) {
                ret = -EDEADLK;
                goto out_unlock_release_sem;
        }
@@ -1408,7 +1412,7 @@ static int futex_lock_pi(u32 __user *uaddr, struct rw_semaphore *fshared,
         */
        if (unlikely(ownerdied || !(curval & FUTEX_TID_MASK))) {
                /* Keep the OWNER_DIED bit */
-               newval = (curval & ~FUTEX_TID_MASK) | current->pid;
+               newval = (curval & ~FUTEX_TID_MASK) | task_pid_vnr(current);
                ownerdied = 0;
                lock_taken = 1;
        }
@@ -1587,7 +1591,7 @@ retry:
        /*
         * We release only a lock we actually own:
         */
-       if ((uval & FUTEX_TID_MASK) != current->pid)
+       if ((uval & FUTEX_TID_MASK) != task_pid_vnr(current))
                return -EPERM;
        /*
         * First take all the futex related locks:
@@ -1608,7 +1612,7 @@ retry_unlocked:
         * anyone else up:
         */
        if (!(uval & FUTEX_OWNER_DIED))
-               uval = cmpxchg_futex_value_locked(uaddr, current->pid, 0);
+               uval = cmpxchg_futex_value_locked(uaddr, task_pid_vnr(current), 0);
 
 
        if (unlikely(uval == -EFAULT))
@@ -1617,7 +1621,7 @@ retry_unlocked:
         * Rare case: we managed to release the lock atomically,
         * no need to wake anyone else up:
         */
-       if (unlikely(uval == current->pid))
+       if (unlikely(uval == task_pid_vnr(current)))
                goto out_unlock;
 
        /*
@@ -1854,7 +1858,8 @@ sys_get_robust_list(int pid, struct robust_list_head __user * __user *head_ptr,
 
                ret = -ESRCH;
                rcu_read_lock();
-               p = find_task_by_pid(pid);
+               p = find_task_by_pid_ns(pid,
+                               current->nsproxy->pid_ns);
                if (!p)
                        goto err_unlock;
                ret = -EPERM;
@@ -1887,7 +1892,7 @@ retry:
        if (get_user(uval, uaddr))
                return -1;
 
-       if ((uval & FUTEX_TID_MASK) == curr->pid) {
+       if ((uval & FUTEX_TID_MASK) == task_pid_vnr(curr)) {
                /*
                 * Ok, this dying thread is truly holding a futex
                 * of interest. Set the OWNER_DIED bit atomically