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| author | Rob Landley <rob@landley.net> | 2013-09-11 14:26:06 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-09-11 15:59:36 -0700 |
| commit | 137fdcc18a5979b53c0a1379b25fc68724e98a45 (patch) | |
| tree | 4578399c35a509933e38e2951f46efe167012785 /fs/ramfs/inode.c | |
| parent | 5e4c0d974139a98741b829b27cf38dc8f9284490 (diff) | |
| download | lwn-137fdcc18a5979b53c0a1379b25fc68724e98a45.tar.gz lwn-137fdcc18a5979b53c0a1379b25fc68724e98a45.zip | |
initmpfs: replace MS_NOUSER in initramfs
Mounting MS_NOUSER prevents --bind mounts from rootfs. Prevent new rootfs
mounts with a different mechanism that doesn't affect bind mounts.
Signed-off-by: Rob Landley <rob@landley.net>
Cc: Jeff Layton <jlayton@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Stephen Warren <swarren@nvidia.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Jim Cromie <jim.cromie@gmail.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ramfs/inode.c')
| -rw-r--r-- | fs/ramfs/inode.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c index c24f1e10b946..8f7fe323e049 100644 --- a/fs/ramfs/inode.c +++ b/fs/ramfs/inode.c @@ -247,7 +247,12 @@ struct dentry *ramfs_mount(struct file_system_type *fs_type, static struct dentry *rootfs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { - return mount_nodev(fs_type, flags|MS_NOUSER, data, ramfs_fill_super); + static unsigned long once; + + if (test_and_set_bit(1, &once)) + return ERR_PTR(-ENODEV); + + return mount_nodev(fs_type, flags, data, ramfs_fill_super); } static void ramfs_kill_sb(struct super_block *sb) |