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>
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index d1acab9..b18e06d 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -721,7 +721,7 @@
* 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 @@
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 @@
struct fuse_getxattr_out outarg;
ssize_t ret;
+ if (!fuse_allow_task(fc, current))
+ return -EACCES;
+
if (fc->no_listxattr)
return -EOPNOTSUPP;
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 1764506..e7464b8 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -565,3 +565,8 @@
* 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);
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index fd07357..00bb5a2 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -287,6 +287,11 @@
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);