diff options
| author | Aurelien Aptel <aaptel@suse.com> | 2016-05-25 19:59:09 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-08-20 18:09:20 +0200 |
| commit | a636a9b1306587bbfab54b1e435461289a4c2c35 (patch) | |
| tree | b46a357405dc688d85bd2f8e69ef20c0158ec946 /fs/cifs/inode.c | |
| parent | 564e0f8b22814e1b811bbc77953c9554e2a08328 (diff) | |
fs/cifs: make share unaccessible at root level mountable
commit a6b5058fafdf508904bbf16c29b24042cef3c496 upstream.
if, when mounting //HOST/share/sub/dir/foo we can query /sub/dir/foo but
not any of the path components above:
- store the /sub/dir/foo prefix in the cifs super_block info
- in the superblock, set root dentry to the subpath dentry (instead of
the share root)
- set a flag in the superblock to remember it
- use prefixpath when building path from a dentry
fixes bso#8950
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/cifs/inode.c')
| -rw-r--r-- | fs/cifs/inode.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c index a329f5ba35aa..9cdeb0293267 100644 --- a/fs/cifs/inode.c +++ b/fs/cifs/inode.c @@ -982,10 +982,26 @@ struct inode *cifs_root_iget(struct super_block *sb) struct inode *inode = NULL; long rc; struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb); + char *path = NULL; + int len; + + if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) + && cifs_sb->prepath) { + len = strlen(cifs_sb->prepath); + path = kzalloc(len + 2 /* leading sep + null */, GFP_KERNEL); + if (path == NULL) + return ERR_PTR(-ENOMEM); + path[0] = '/'; + memcpy(path+1, cifs_sb->prepath, len); + } else { + path = kstrdup("", GFP_KERNEL); + if (path == NULL) + return ERR_PTR(-ENOMEM); + } xid = get_xid(); if (tcon->unix_ext) { - rc = cifs_get_inode_info_unix(&inode, "", sb, xid); + rc = cifs_get_inode_info_unix(&inode, path, sb, xid); /* some servers mistakenly claim POSIX support */ if (rc != -EOPNOTSUPP) goto iget_no_retry; @@ -993,7 +1009,8 @@ struct inode *cifs_root_iget(struct super_block *sb) tcon->unix_ext = false; } - rc = cifs_get_inode_info(&inode, "", NULL, sb, xid, NULL); + convert_delimiter(path, CIFS_DIR_SEP(cifs_sb)); + rc = cifs_get_inode_info(&inode, path, NULL, sb, xid, NULL); iget_no_retry: if (!inode) { @@ -1022,6 +1039,7 @@ iget_no_retry: } out: + kfree(path); /* can not call macro free_xid here since in a void func * TODO: This is no longer true */ |