proc: fix mount -t proc -o AAA

The proc_parse_options() call from proc_mount() runs only once at boot
time.  So on any later mount attempt, any mount options are ignored
because ->s_root is already initialized.

As a consequence, "mount -o <options>" will ignore the options.  The
only way to change mount options is "mount -o remount,<options>".

To fix this, parse the mount options unconditionally.

Signed-off-by: Vasiliy Kulikov <segoon@openwall.com>
Reported-by: Arkadiusz Miskiewicz <a.miskiewicz@gmail.com>
Tested-by: Arkadiusz Miskiewicz <a.miskiewicz@gmail.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/proc/root.c b/fs/proc/root.c
index 46a15d8a29ca74d9ca0a68a57e416108e6b599f3..eed44bfc85db7c6ea420233dd09c2e5b9b5f0350 100644 (file)
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -115,12 +115,13 @@ static struct dentry *proc_mount(struct file_system_type *fs_type,
        if (IS_ERR(sb))
                return ERR_CAST(sb);
 
+       if (!proc_parse_options(options, ns)) {
+               deactivate_locked_super(sb);
+               return ERR_PTR(-EINVAL);
+       }
+
        if (!sb->s_root) {
                sb->s_flags = flags;
-               if (!proc_parse_options(options, ns)) {
-                       deactivate_locked_super(sb);
-                       return ERR_PTR(-EINVAL);
-               }
                err = proc_fill_super(sb);
                if (err) {
                        deactivate_locked_super(sb);