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fuse: fix allowing operations 

The following operation didn't check if sending the request was allowed:

  setattr
  listxattr
  statfs

Some other operations don't explicitly do the check, but VFS calls
->permission() which checks this.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miklos Szeredi 2007-10-18 03:06:58 -07:00 committed by Linus Torvalds
parent 42a2b6ad71
commit e57ac68378
3 changed files with 17 additions and 1 deletions
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8
fs/fuse/dir.c
View File

@ -721,7 +721,7 @@ static int fuse_refresh_attributes(struct inode *inode)
* for which the owner of the mount has ptrace privilege. This
* excludes processes started by other users, suid or sgid processes.
*/
static int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task)
int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task)
{
if (fc->flags & FUSE_ALLOW_OTHER)
return 1;
@ -1005,6 +1005,9 @@ static int fuse_setattr(struct dentry *entry, struct iattr *attr)
struct fuse_attr_out outarg;
int err;
if (!fuse_allow_task(fc, current))
return -EACCES;
if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
err = inode_change_ok(inode, attr);
if (err)
@ -1172,6 +1175,9 @@ static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
struct fuse_getxattr_out outarg;
ssize_t ret;
if (!fuse_allow_task(fc, current))
return -EACCES;
if (fc->no_listxattr)
return -EOPNOTSUPP;

5
fs/fuse/fuse_i.h
View File

@ -565,3 +565,8 @@ void fuse_ctl_remove_conn(struct fuse_conn *fc);
* Is file type valid?
*/
int fuse_valid_type(int m);
/**
* Is task allowed to perform filesystem operation?
*/
int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task);

5
fs/fuse/inode.c
View File

@ -287,6 +287,11 @@ static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
struct fuse_statfs_out outarg;
int err;
if (!fuse_allow_task(fc, current)) {
buf->f_type = FUSE_SUPER_MAGIC;
return 0;
}
req = fuse_get_req(fc);
if (IS_ERR(req))
return PTR_ERR(req);