summaryrefslogtreecommitdiffstats
path: root/fs/cifs/connect.c
diff options
context:
space:
mode:
authorAurelien Aptel <aaptel@suse.com>2016-05-25 19:59:09 +0200
committerSteve French <smfrench@gmail.com>2016-07-28 05:50:55 +0200
commita6b5058fafdf508904bbf16c29b24042cef3c496 (patch)
tree608fb6daff9de4338e6a19661d27e54a517cf4a1 /fs/cifs/connect.c
parentcifs: fix crash due to race in hmac(md5) handling (diff)
downloadlinux-a6b5058fafdf508904bbf16c29b24042cef3c496.tar.xz
linux-a6b5058fafdf508904bbf16c29b24042cef3c496.zip
fs/cifs: make share unaccessible at root level mountable
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>
Diffstat (limited to 'fs/cifs/connect.c')
-rw-r--r--fs/cifs/connect.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index eb24653612bc..7ae03283bd61 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -3485,6 +3485,44 @@ cifs_get_volume_info(char *mount_data, const char *devname)
return volume_info;
}
+static int
+cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
+ unsigned int xid,
+ struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb,
+ char *full_path)
+{
+ int rc;
+ char *s;
+ char sep, tmp;
+
+ sep = CIFS_DIR_SEP(cifs_sb);
+ s = full_path;
+
+ rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
+ while (rc == 0) {
+ /* skip separators */
+ while (*s == sep)
+ s++;
+ if (!*s)
+ break;
+ /* next separator */
+ while (*s && *s != sep)
+ s++;
+
+ /*
+ * temporarily null-terminate the path at the end of
+ * the current component
+ */
+ tmp = *s;
+ *s = 0;
+ rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
+ full_path);
+ *s = tmp;
+ }
+ return rc;
+}
+
int
cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
{
@@ -3622,6 +3660,16 @@ remote_path_check:
kfree(full_path);
goto mount_fail_check;
}
+
+ rc = cifs_are_all_path_components_accessible(server,
+ xid, tcon, cifs_sb,
+ full_path);
+ if (rc != 0) {
+ cifs_dbg(VFS, "cannot query dirs between root and final path, "
+ "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
+ rc = 0;
+ }
kfree(full_path);
}
@@ -3891,6 +3939,7 @@ cifs_umount(struct cifs_sb_info *cifs_sb)
bdi_destroy(&cifs_sb->bdi);
kfree(cifs_sb->mountdata);
+ kfree(cifs_sb->prepath);
call_rcu(&cifs_sb->rcu, delayed_free);
}