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authorAndy Adamson <andros@citi.umich.edu>2006-03-20 21:44:26 +0300
committerTrond Myklebust <Trond.Myklebust@netapp.com>2006-03-20 21:44:26 +0300
commit8dc7c3115b611c00006eac3ee5b108296432aab7 (patch)
treebe44c59907cbdcb6fdf46d0ad9cc140af757acfc /fs
parent2e0af86f618c697b44e2d67dff151256c58201c4 (diff)
downloadlinux-8dc7c3115b611c00006eac3ee5b108296432aab7.tar.xz
locks,lockd: fix race in nlmsvc_testlock
posix_test_lock() returns a pointer to a struct file_lock which is unprotected and can be removed while in use by the caller. Move the conflicting lock from the return to a parameter, and copy the conflicting lock. In most cases the caller ends up putting the copy of the conflicting lock on the stack. On i386, sizeof(struct file_lock) appears to be about 100 bytes. We're assuming that's reasonable. Signed-off-by: Andy Adamson <andros@citi.umich.edu> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/lockd/svclock.c12
-rw-r--r--fs/locks.c21
-rw-r--r--fs/nfs/file.c7
-rw-r--r--fs/nfsd/nfs4state.c13
4 files changed, 27 insertions, 26 deletions
diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c
index f5398097b84b..d683dd022e08 100644
--- a/fs/lockd/svclock.c
+++ b/fs/lockd/svclock.c
@@ -376,8 +376,6 @@ u32
nlmsvc_testlock(struct nlm_file *file, struct nlm_lock *lock,
struct nlm_lock *conflock)
{
- struct file_lock *fl;
-
dprintk("lockd: nlmsvc_testlock(%s/%ld, ty=%d, %Ld-%Ld)\n",
file->f_file->f_dentry->d_inode->i_sb->s_id,
file->f_file->f_dentry->d_inode->i_ino,
@@ -385,14 +383,14 @@ nlmsvc_testlock(struct nlm_file *file, struct nlm_lock *lock,
(long long)lock->fl.fl_start,
(long long)lock->fl.fl_end);
- if ((fl = posix_test_lock(file->f_file, &lock->fl)) != NULL) {
+ if (posix_test_lock(file->f_file, &lock->fl, &conflock->fl)) {
dprintk("lockd: conflicting lock(ty=%d, %Ld-%Ld)\n",
- fl->fl_type, (long long)fl->fl_start,
- (long long)fl->fl_end);
+ conflock->fl.fl_type,
+ (long long)conflock->fl.fl_start,
+ (long long)conflock->fl.fl_end);
conflock->caller = "somehost"; /* FIXME */
conflock->oh.len = 0; /* don't return OH info */
- conflock->svid = fl->fl_pid;
- conflock->fl = *fl;
+ conflock->svid = conflock->fl.fl_pid;
return nlm_lck_denied;
}
diff --git a/fs/locks.c b/fs/locks.c
index cb940b142c5f..231b23c12c3d 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -672,8 +672,9 @@ static int locks_block_on_timeout(struct file_lock *blocker, struct file_lock *w
return result;
}
-struct file_lock *
-posix_test_lock(struct file *filp, struct file_lock *fl)
+int
+posix_test_lock(struct file *filp, struct file_lock *fl,
+ struct file_lock *conflock)
{
struct file_lock *cfl;
@@ -684,9 +685,13 @@ posix_test_lock(struct file *filp, struct file_lock *fl)
if (posix_locks_conflict(cfl, fl))
break;
}
+ if (cfl) {
+ locks_copy_lock(conflock, cfl);
+ unlock_kernel();
+ return 1;
+ }
unlock_kernel();
-
- return (cfl);
+ return 0;
}
EXPORT_SYMBOL(posix_test_lock);
@@ -1563,7 +1568,7 @@ asmlinkage long sys_flock(unsigned int fd, unsigned int cmd)
*/
int fcntl_getlk(struct file *filp, struct flock __user *l)
{
- struct file_lock *fl, file_lock;
+ struct file_lock *fl, cfl, file_lock;
struct flock flock;
int error;
@@ -1587,7 +1592,7 @@ int fcntl_getlk(struct file *filp, struct flock __user *l)
else
fl = (file_lock.fl_type == F_UNLCK ? NULL : &file_lock);
} else {
- fl = posix_test_lock(filp, &file_lock);
+ fl = (posix_test_lock(filp, &file_lock, &cfl) ? &cfl : NULL);
}
flock.l_type = F_UNLCK;
@@ -1717,7 +1722,7 @@ out:
*/
int fcntl_getlk64(struct file *filp, struct flock64 __user *l)
{
- struct file_lock *fl, file_lock;
+ struct file_lock *fl, cfl, file_lock;
struct flock64 flock;
int error;
@@ -1741,7 +1746,7 @@ int fcntl_getlk64(struct file *filp, struct flock64 __user *l)
else
fl = (file_lock.fl_type == F_UNLCK ? NULL : &file_lock);
} else {
- fl = posix_test_lock(filp, &file_lock);
+ fl = (posix_test_lock(filp, &file_lock, &cfl) ? &cfl : NULL);
}
flock.l_type = F_UNLCK;
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index 1cf07e4ad136..ee140c53dba6 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -392,15 +392,14 @@ out_swapfile:
static int do_getlk(struct file *filp, int cmd, struct file_lock *fl)
{
- struct file_lock *cfl;
+ struct file_lock cfl;
struct inode *inode = filp->f_mapping->host;
int status = 0;
lock_kernel();
/* Try local locking first */
- cfl = posix_test_lock(filp, fl);
- if (cfl != NULL) {
- locks_copy_lock(fl, cfl);
+ if (posix_test_lock(filp, fl, &cfl)) {
+ locks_copy_lock(fl, &cfl);
goto out;
}
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 1143cfb64549..f6ab762bea99 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2639,7 +2639,7 @@ nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock
struct nfs4_stateid *lock_stp;
struct file *filp;
struct file_lock file_lock;
- struct file_lock *conflock;
+ struct file_lock conflock;
int status = 0;
unsigned int strhashval;
@@ -2775,11 +2775,11 @@ conflicting_lock:
/* XXX There is a race here. Future patch needed to provide
* an atomic posix_lock_and_test_file
*/
- if (!(conflock = posix_test_lock(filp, &file_lock))) {
+ if (!posix_test_lock(filp, &file_lock, &conflock)) {
status = nfserr_serverfault;
goto out;
}
- nfs4_set_lock_denied(conflock, &lock->lk_denied);
+ nfs4_set_lock_denied(&conflock, &lock->lk_denied);
out:
if (status && lock->lk_is_new && lock_sop)
release_stateowner(lock_sop);
@@ -2800,7 +2800,7 @@ nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock
struct inode *inode;
struct file file;
struct file_lock file_lock;
- struct file_lock *conflicting_lock;
+ struct file_lock conflock;
int status;
if (nfs4_in_grace())
@@ -2864,10 +2864,9 @@ nfsd4_lockt(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock
file.f_dentry = current_fh->fh_dentry;
status = nfs_ok;
- conflicting_lock = posix_test_lock(&file, &file_lock);
- if (conflicting_lock) {
+ if (posix_test_lock(&file, &file_lock, &conflock)) {
status = nfserr_denied;
- nfs4_set_lock_denied(conflicting_lock, &lockt->lt_denied);
+ nfs4_set_lock_denied(&conflock, &lockt->lt_denied);
}
out:
nfs4_unlock_state();