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authorLinus Torvalds <torvalds@linux-foundation.org>2009-09-11 13:16:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-11 13:16:22 -0700
commit7193bea53f9d9730bbc859777c2f86c76349914d (patch)
treec841e3d256d63bf30cd4acc4751d9213c0ba7dff /kernel
parent989aa44a5f215427085ccfe65c1e378e3399c9eb (diff)
parent84bc4af59081ee974dd80210e694ab59ebe51ce8 (diff)
Merge branch 'core-futexes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'core-futexes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: futex: Detect mismatched requeue targets futex: Correct futex_wait_requeue_pi() commentary
Diffstat (limited to 'kernel')
-rw-r--r--kernel/futex.c47
1 files changed, 30 insertions, 17 deletions
diff --git a/kernel/futex.c b/kernel/futex.c
index e18cfbdc7190..248dd119a86e 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -115,6 +115,9 @@ struct futex_q {
/* rt_waiter storage for requeue_pi: */
struct rt_mutex_waiter *rt_waiter;
+ /* The expected requeue pi target futex key: */
+ union futex_key *requeue_pi_key;
+
/* Bitset for the optional bitmasked wakeup */
u32 bitset;
};
@@ -1089,6 +1092,10 @@ static int futex_proxy_trylock_atomic(u32 __user *pifutex,
if (!top_waiter)
return 0;
+ /* Ensure we requeue to the expected futex. */
+ if (!match_futex(top_waiter->requeue_pi_key, key2))
+ return -EINVAL;
+
/*
* Try to take the lock for top_waiter. Set the FUTEX_WAITERS bit in
* the contended case or if set_waiters is 1. The pi_state is returned
@@ -1276,6 +1283,12 @@ retry_private:
continue;
}
+ /* Ensure we requeue to the expected futex for requeue_pi. */
+ if (requeue_pi && !match_futex(this->requeue_pi_key, &key2)) {
+ ret = -EINVAL;
+ break;
+ }
+
/*
* Requeue nr_requeue waiters and possibly one more in the case
* of requeue_pi if we couldn't acquire the lock atomically.
@@ -1751,6 +1764,7 @@ static int futex_wait(u32 __user *uaddr, int fshared,
q.pi_state = NULL;
q.bitset = bitset;
q.rt_waiter = NULL;
+ q.requeue_pi_key = NULL;
if (abs_time) {
to = &timeout;
@@ -1858,6 +1872,7 @@ static int futex_lock_pi(u32 __user *uaddr, int fshared,
q.pi_state = NULL;
q.rt_waiter = NULL;
+ q.requeue_pi_key = NULL;
retry:
q.key = FUTEX_KEY_INIT;
ret = get_futex_key(uaddr, fshared, &q.key, VERIFY_WRITE);
@@ -2118,11 +2133,11 @@ int handle_early_requeue_pi_wakeup(struct futex_hash_bucket *hb,
* We call schedule in futex_wait_queue_me() when we enqueue and return there
* via the following:
* 1) wakeup on uaddr2 after an atomic lock acquisition by futex_requeue()
- * 2) wakeup on uaddr2 after a requeue and subsequent unlock
- * 3) signal (before or after requeue)
- * 4) timeout (before or after requeue)
+ * 2) wakeup on uaddr2 after a requeue
+ * 3) signal
+ * 4) timeout
*
- * If 3, we setup a restart_block with futex_wait_requeue_pi() as the function.
+ * If 3, cleanup and return -ERESTARTNOINTR.
*
* If 2, we may then block on trying to take the rt_mutex and return via:
* 5) successful lock
@@ -2130,7 +2145,7 @@ int handle_early_requeue_pi_wakeup(struct futex_hash_bucket *hb,
* 7) timeout
* 8) other lock acquisition failure
*
- * If 6, we setup a restart_block with futex_lock_pi() as the function.
+ * If 6, return -EWOULDBLOCK (restarting the syscall would do the same).
*
* If 4 or 7, we cleanup and return with -ETIMEDOUT.
*
@@ -2169,15 +2184,16 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, int fshared,
debug_rt_mutex_init_waiter(&rt_waiter);
rt_waiter.task = NULL;
- q.pi_state = NULL;
- q.bitset = bitset;
- q.rt_waiter = &rt_waiter;
-
key2 = FUTEX_KEY_INIT;
ret = get_futex_key(uaddr2, fshared, &key2, VERIFY_WRITE);
if (unlikely(ret != 0))
goto out;
+ q.pi_state = NULL;
+ q.bitset = bitset;
+ q.rt_waiter = &rt_waiter;
+ q.requeue_pi_key = &key2;
+
/* Prepare to wait on uaddr. */
ret = futex_wait_setup(uaddr, val, fshared, &q, &hb);
if (ret)
@@ -2248,14 +2264,11 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, int fshared,
rt_mutex_unlock(pi_mutex);
} else if (ret == -EINTR) {
/*
- * We've already been requeued, but we have no way to
- * restart by calling futex_lock_pi() directly. We
- * could restart the syscall, but that will look at
- * the user space value and return right away. So we
- * drop back with EWOULDBLOCK to tell user space that
- * "val" has been changed. That's the same what the
- * restart of the syscall would do in
- * futex_wait_setup().
+ * We've already been requeued, but cannot restart by calling
+ * futex_lock_pi() directly. We could restart this syscall, but
+ * it would detect that the user space "val" changed and return
+ * -EWOULDBLOCK. Save the overhead of the restart and return
+ * -EWOULDBLOCK directly.
*/
ret = -EWOULDBLOCK;
}