Commit 39ee059a authored by Miklos Szeredi's avatar Miklos Szeredi Committed by Linus Torvalds
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[PATCH] fuse: check file type in lookup



Previously invalid types were quietly changed to regular files, but at
revalidation the inode was changed to bad.  This was rather inconsistent
behavior.

Now check if the type is valid on initial lookup, and return -EIO if not.
Signed-off-by: default avatarMiklos Szeredi <miklos@szeredi.hu>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 6ad84aca
......@@ -166,6 +166,12 @@ static struct dentry_operations fuse_dentry_operations = {
.d_revalidate = fuse_dentry_revalidate,
};
static inline int valid_mode(int m)
{
return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) ||
S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m);
}
static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
struct nameidata *nd)
{
......@@ -185,7 +191,8 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
fuse_lookup_init(req, dir, entry, &outarg);
request_send(fc, req);
err = req->out.h.error;
if (!err && outarg.nodeid && invalid_nodeid(outarg.nodeid))
if (!err && ((outarg.nodeid && invalid_nodeid(outarg.nodeid)) ||
!valid_mode(outarg.attr.mode)))
err = -EIO;
if (!err && outarg.nodeid) {
inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
......@@ -328,10 +335,13 @@ static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
fuse_put_request(fc, req);
return err;
}
if (invalid_nodeid(outarg.nodeid)) {
fuse_put_request(fc, req);
return -EIO;
}
err = -EIO;
if (invalid_nodeid(outarg.nodeid))
goto out_put_request;
if ((outarg.attr.mode ^ mode) & S_IFMT)
goto out_put_request;
inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
&outarg.attr);
if (!inode) {
......@@ -340,8 +350,7 @@ static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
}
fuse_put_request(fc, req);
/* Don't allow userspace to do really stupid things... */
if (((inode->i_mode ^ mode) & S_IFMT) || dir_alias(inode)) {
if (dir_alias(inode)) {
iput(inode);
return -EIO;
}
......@@ -350,6 +359,10 @@ static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
fuse_change_timeout(entry, &outarg);
fuse_invalidate_attr(dir);
return 0;
out_put_request:
fuse_put_request(fc, req);
return err;
}
static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode,
......
......@@ -135,12 +135,8 @@ static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
fuse_init_common(inode);
init_special_inode(inode, inode->i_mode,
new_decode_dev(attr->rdev));
} else {
/* Don't let user create weird files */
inode->i_mode = S_IFREG;
fuse_init_common(inode);
fuse_init_file_inode(inode);
}
} else
BUG();
}
static int fuse_inode_eq(struct inode *inode, void *_nodeidp)
......
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