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fs/cifs: make share unaccessible at root level mountable

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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>
CC: Stable <stable@vger.kernel.org>
Reviewed-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Aurelien Aptel
2016-05-25 19:59:09 +02:00
committed by Steve French
parent bd975d1eea
commit a6b5058faf
5 changed files with 104 additions and 5 deletions
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14
fs/cifs/cifsfs.c
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@@ -689,6 +689,14 @@ cifs_do_mount(struct file_system_type *fs_type,
goto out_cifs_sb;
}
if (volume_info->prepath) {
cifs_sb->prepath = kstrdup(volume_info->prepath, GFP_KERNEL);
if (cifs_sb->prepath == NULL) {
root = ERR_PTR(-ENOMEM);
goto out_cifs_sb;
}
}
cifs_setup_cifs_sb(volume_info, cifs_sb);
rc = cifs_mount(cifs_sb, volume_info);
@@ -727,7 +735,11 @@ cifs_do_mount(struct file_system_type *fs_type,
sb->s_flags |= MS_ACTIVE;
}
root = cifs_get_root(volume_info, sb);
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
root = dget(sb->s_root);
else
root = cifs_get_root(volume_info, sb);
if (IS_ERR(root))
goto out_super;