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-rw-r--r--fs/open.c35
1 files changed, 29 insertions, 6 deletions
diff --git a/fs/open.c b/fs/open.c
index 48afc5c139d2..14a51de01f54 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -669,11 +669,16 @@ static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
int (*open)(struct inode *, struct file *),
const struct cred *cred)
{
+ static const struct file_operations empty_fops = {};
struct inode *inode;
int error;
f->f_mode = OPEN_FMODE(f->f_flags) | FMODE_LSEEK |
FMODE_PREAD | FMODE_PWRITE;
+
+ if (unlikely(f->f_flags & O_PATH))
+ f->f_mode = FMODE_PATH;
+
inode = dentry->d_inode;
if (f->f_mode & FMODE_WRITE) {
error = __get_file_write_access(inode, mnt);
@@ -687,9 +692,15 @@ static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
f->f_path.dentry = dentry;
f->f_path.mnt = mnt;
f->f_pos = 0;
- f->f_op = fops_get(inode->i_fop);
file_sb_list_add(f, inode->i_sb);
+ if (unlikely(f->f_mode & FMODE_PATH)) {
+ f->f_op = &empty_fops;
+ return f;
+ }
+
+ f->f_op = fops_get(inode->i_fop);
+
error = security_dentry_open(f, cred);
if (error)
goto cleanup_all;
@@ -911,9 +922,18 @@ static inline int build_open_flags(int flags, int mode, struct open_flags *op)
if (flags & __O_SYNC)
flags |= O_DSYNC;
- op->open_flag = flags;
+ /*
+ * If we have O_PATH in the open flag. Then we
+ * cannot have anything other than the below set of flags
+ */
+ if (flags & O_PATH) {
+ flags &= O_DIRECTORY | O_NOFOLLOW | O_PATH;
+ acc_mode = 0;
+ } else {
+ acc_mode = MAY_OPEN | ACC_MODE(flags);
+ }
- acc_mode = MAY_OPEN | ACC_MODE(flags);
+ op->open_flag = flags;
/* O_TRUNC implies we need access checks for write permissions */
if (flags & O_TRUNC)
@@ -926,7 +946,8 @@ static inline int build_open_flags(int flags, int mode, struct open_flags *op)
op->acc_mode = acc_mode;
- op->intent = LOOKUP_OPEN;
+ op->intent = flags & O_PATH ? 0 : LOOKUP_OPEN;
+
if (flags & O_CREAT) {
op->intent |= LOOKUP_CREATE;
if (flags & O_EXCL)
@@ -1053,8 +1074,10 @@ int filp_close(struct file *filp, fl_owner_t id)
if (filp->f_op && filp->f_op->flush)
retval = filp->f_op->flush(filp, id);
- dnotify_flush(filp, id);
- locks_remove_posix(filp, id);
+ if (likely(!(filp->f_mode & FMODE_PATH))) {
+ dnotify_flush(filp, id);
+ locks_remove_posix(filp, id);
+ }
fput(filp);
return retval;
}