diff options
| author | Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> | 2007-03-07 20:41:08 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-08 07:38:21 -0800 |
| commit | a6eb0be6d5cc1851deb6619e6f8b1bbd0a0dbab4 (patch) | |
| tree | 343443d81384c9681630190e88afacd81bb5fac5 /fs/hostfs | |
| parent | bca271136f06514253aa28c24c04fc23b88e971e (diff) | |
| download | lwn-a6eb0be6d5cc1851deb6619e6f8b1bbd0a0dbab4.tar.gz lwn-a6eb0be6d5cc1851deb6619e6f8b1bbd0a0dbab4.zip | |
[PATCH] uml: hostfs: make hostfs= option work as a jail, as intended.
When a given host directory is specified to be mounted both in hostfs=path1
and with mount option -o path2, we should give access to path1/path2, but this
does not happen. Fix that in the simpler way.
Also, root_ino can be the empty string, since we use %s/%s as format.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/hostfs')
| -rw-r--r-- | fs/hostfs/hostfs_kern.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c index 6f10e43746f9..9baf69773ed1 100644 --- a/fs/hostfs/hostfs_kern.c +++ b/fs/hostfs/hostfs_kern.c @@ -47,7 +47,7 @@ struct dentry_operations hostfs_dentry_ops = { }; /* Changed in hostfs_args before the kernel starts running */ -static char *root_ino = "/"; +static char *root_ino = ""; static int append = 0; #define HOSTFS_SUPER_MAGIC 0x00c0ffee @@ -947,15 +947,17 @@ static int hostfs_fill_sb_common(struct super_block *sb, void *d, int silent) sb->s_magic = HOSTFS_SUPER_MAGIC; sb->s_op = &hostfs_sbops; - if((data == NULL) || (*data == '\0')) - data = root_ino; + /* NULL is printed as <NULL> by sprintf: avoid that. */ + if (data == NULL) + data = ""; err = -ENOMEM; - name = kmalloc(strlen(data) + 1, GFP_KERNEL); + name = kmalloc(strlen(root_ino) + 1 + + strlen(data) + 1, GFP_KERNEL); if(name == NULL) goto out; - strcpy(name, data); + sprintf(name, "%s/%s", root_ino, data); root_inode = iget(sb, 0); if(root_inode == NULL) |