leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Merge branch 'core/urgent' into core/futexes

Browse Source 
Merge reason: this branch was on an pre -rc1 base, merge it up to -rc6+
              to get the latest upstream fixes.

Conflicts:
	kernel/futex.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner
2009-05-20 09:02:28 +02:00
parent f1a11e0576 64d1304a64
commit 521c180874
4431 changed files with 492502 additions and 162339 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
kernel/futex.c
View File

@@ -199,6 +199,7 @@ static void drop_futex_key_refs(union futex_key *key)
* @uaddr: virtual address of the futex
* @fshared: 0 for a PROCESS_PRIVATE futex, 1 for PROCESS_SHARED
* @key: address where result is stored.
* @rw: mapping needs to be read/write (values: VERIFY_READ, VERIFY_WRITE)
*
* Returns a negative error code or 0
* The key words are stored in *key on success.
@@ -209,7 +210,8 @@ static void drop_futex_key_refs(union futex_key *key)
*
* lock_page() might sleep, the caller should not hold a spinlock.
*/
static int get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key)
static int
get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key, int rw)
{
unsigned long address = (unsigned long)uaddr;
struct mm_struct *mm = current->mm;
@@ -232,7 +234,7 @@ static int get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key)
* but access_ok() should be faster than find_vma()
*/
if (!fshared) {
if (unlikely(!access_ok(VERIFY_WRITE, uaddr, sizeof(u32))))
if (unlikely(!access_ok(rw, uaddr, sizeof(u32))))
return -EFAULT;
key->private.mm = mm;
key->private.address = address;
@@ -241,7 +243,7 @@ static int get_futex_key(u32 __user *uaddr, int fshared, union futex_key *key)
}
again:
err = get_user_pages_fast(address, 1, 0, &page);
err = get_user_pages_fast(address, 1, rw == VERIFY_WRITE, &page);
if (err < 0)
return err;
@@ -834,7 +836,7 @@ static int futex_wake(u32 __user *uaddr, int fshared, int nr_wake, u32 bitset)
if (!bitset)
return -EINVAL;
ret = get_futex_key(uaddr, fshared, &key);
ret = get_futex_key(uaddr, fshared, &key, VERIFY_READ);
if (unlikely(ret != 0))
goto out;
@@ -880,10 +882,10 @@ futex_wake_op(u32 __user *uaddr1, int fshared, u32 __user *uaddr2,
int ret, op_ret;
retry:
ret = get_futex_key(uaddr1, fshared, &key1);
ret = get_futex_key(uaddr1, fshared, &key1, VERIFY_READ);
if (unlikely(ret != 0))
goto out;
ret = get_futex_key(uaddr2, fshared, &key2);
ret = get_futex_key(uaddr2, fshared, &key2, VERIFY_WRITE);
if (unlikely(ret != 0))
goto out_put_key1;
@@ -1131,10 +1133,11 @@ retry:
pi_state = NULL;
}
ret = get_futex_key(uaddr1, fshared, &key1);
ret = get_futex_key(uaddr1, fshared, &key1, VERIFY_READ);
if (unlikely(ret != 0))
goto out;
ret = get_futex_key(uaddr2, fshared, &key2);
ret = get_futex_key(uaddr2, fshared, &key2,
requeue_pi ? VERIFY_WRITE : VERIFY_READ);
if (unlikely(ret != 0))
goto out_put_key1;
@@ -1267,7 +1270,12 @@ retry_private:
out_unlock:
double_unlock_hb(hb1, hb2);
/* drop_futex_key_refs() must be called outside the spinlocks. */
/*
* drop_futex_key_refs() must be called outside the spinlocks. During
* the requeue we moved futex_q's from the hash bucket at key1 to the
* one at key2 and updated their key pointer. We no longer need to
* hold the references to key1.
*/
while (--drop_count >= 0)
drop_futex_key_refs(&key1);
@@ -1660,7 +1668,7 @@ static int futex_wait_setup(u32 __user *uaddr, u32 val, int fshared,
*/
retry:
q->key = FUTEX_KEY_INIT;
ret = get_futex_key(uaddr, fshared, &q->key);
ret = get_futex_key(uaddr, fshared, &q->key, VERIFY_READ);
if (unlikely(ret != 0))
return ret;
@@ -1819,7 +1827,7 @@ static int futex_lock_pi(u32 __user *uaddr, int fshared,
q.rt_waiter = NULL;
retry:
q.key = FUTEX_KEY_INIT;
ret = get_futex_key(uaddr, fshared, &q.key);
ret = get_futex_key(uaddr, fshared, &q.key, VERIFY_WRITE);
if (unlikely(ret != 0))
goto out;
@@ -1960,7 +1968,7 @@ retry:
if ((uval & FUTEX_TID_MASK) != task_pid_vnr(current))
return -EPERM;
ret = get_futex_key(uaddr, fshared, &key);
ret = get_futex_key(uaddr, fshared, &key, VERIFY_WRITE);
if (unlikely(ret != 0))
goto out;
@@ -2171,7 +2179,7 @@ static int futex_wait_requeue_pi(u32 __user *uaddr, int fshared,
q.rt_waiter = &rt_waiter;
key2 = FUTEX_KEY_INIT;
ret = get_futex_key(uaddr2, fshared, &key2);
ret = get_futex_key(uaddr2, fshared, &key2, VERIFY_WRITE);
if (unlikely(ret != 0))
goto out;