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authorPaolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>2007-03-07 20:41:08 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-08 07:38:21 -0800
commita6eb0be6d5cc1851deb6619e6f8b1bbd0a0dbab4 (patch)
tree343443d81384c9681630190e88afacd81bb5fac5 /fs/hostfs/hostfs_kern.c
parentbca271136f06514253aa28c24c04fc23b88e971e (diff)
[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/hostfs_kern.c')
-rw-r--r--fs/hostfs/hostfs_kern.c12
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)