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authorThomas Gleixner <tglx@linutronix.de>2012-02-15 12:08:34 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-04-02 09:26:53 -0700
commitbe455802bf55a051bb467b22ad26653a0e78bc61 (patch)
tree30b09eaa67cfdd9072cb4a121f54b853a3737c76 /kernel
parentc924f401df0c34336683c9e4848ab93e819f72a5 (diff)
futex: Cover all PI opcodes with cmpxchg enabled check
commit 59263b513c11398cd66a52d4c5b2b118ce1e0359 upstream. Some of the newer futex PI opcodes do not check the cmpxchg enabled variable and call unconditionally into the handling functions. Cover all PI opcodes in a separate check. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Darren Hart <dvhart@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/futex.c19
1 files changed, 13 insertions, 6 deletions
diff --git a/kernel/futex.c b/kernel/futex.c
index 6487e4cb9935..a2a01ef0ee3c 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -2641,6 +2641,16 @@ long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
}
switch (cmd) {
+ case FUTEX_LOCK_PI:
+ case FUTEX_UNLOCK_PI:
+ case FUTEX_TRYLOCK_PI:
+ case FUTEX_WAIT_REQUEUE_PI:
+ case FUTEX_CMP_REQUEUE_PI:
+ if (!futex_cmpxchg_enabled)
+ return -ENOSYS;
+ }
+
+ switch (cmd) {
case FUTEX_WAIT:
val3 = FUTEX_BITSET_MATCH_ANY;
case FUTEX_WAIT_BITSET:
@@ -2661,16 +2671,13 @@ long do_futex(u32 __user *uaddr, int op, u32 val, ktime_t *timeout,
ret = futex_wake_op(uaddr, flags, uaddr2, val, val2, val3);
break;
case FUTEX_LOCK_PI:
- if (futex_cmpxchg_enabled)
- ret = futex_lock_pi(uaddr, flags, val, timeout, 0);
+ ret = futex_lock_pi(uaddr, flags, val, timeout, 0);
break;
case FUTEX_UNLOCK_PI:
- if (futex_cmpxchg_enabled)
- ret = futex_unlock_pi(uaddr, flags);
+ ret = futex_unlock_pi(uaddr, flags);
break;
case FUTEX_TRYLOCK_PI:
- if (futex_cmpxchg_enabled)
- ret = futex_lock_pi(uaddr, flags, 0, timeout, 1);
+ ret = futex_lock_pi(uaddr, flags, 0, timeout, 1);
break;
case FUTEX_WAIT_REQUEUE_PI:
val3 = FUTEX_BITSET_MATCH_ANY;