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| author | Vasiliy Kulikov <segoon@openwall.com> | 2012-04-05 14:25:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-04-05 15:25:50 -0700 |
| commit | 99663be772c827b8f5f594fe87eb4807be1994e5 (patch) | |
| tree | f1adffce3f6d10a90f5be8b86b96729ce8c5d23c | |
| parent | 10bdfb5ef7e1a429a3de31e498942a8ae5749a46 (diff) | |
| download | linux-stable-99663be772c827b8f5f594fe87eb4807be1994e5.tar.gz linux-stable-99663be772c827b8f5f594fe87eb4807be1994e5.tar.bz2 linux-stable-99663be772c827b8f5f594fe87eb4807be1994e5.zip | |
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>
| -rw-r--r-- | fs/proc/root.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/fs/proc/root.c b/fs/proc/root.c index 46a15d8a29ca..eed44bfc85db 100644 --- 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); |