diff options
| author | Miklos Szeredi <miklos@szeredi.hu> | 2006-06-25 05:48:55 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-25 10:01:20 -0700 |
| commit | 9c8ef5614da22666e339b125263d315cfaa89109 (patch) | |
| tree | 860044f1b2c0c6189143b1c9daf263bd8ff5e5e0 /fs/fuse/inode.c | |
| parent | a4d27e75ffb7b8ecb7eed0c7db0df975525f3fd7 (diff) | |
[PATCH] fuse: scramble lock owner ID
VFS uses current->files pointer as lock owner ID, and it wouldn't be
prudent to expose this value to userspace. So scramble it with XTEA using
a per connection random key, known only to the kernel. Only one direction
needs to be implemented, since the ID is never sent in the reverse
direction.
The XTEA algorithm is implemented inline since it's simple enough to do so,
and this adds less complexity than if the crypto API were used.
Thanks to Jesper Juhl for the idea.
Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/fuse/inode.c')
| -rw-r--r-- | fs/fuse/inode.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index e21ef8a3ad3..5ceb8bd7a18 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -16,6 +16,7 @@ #include <linux/module.h> #include <linux/parser.h> #include <linux/statfs.h> +#include <linux/random.h> MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>"); MODULE_DESCRIPTION("Filesystem in Userspace"); @@ -387,6 +388,7 @@ static struct fuse_conn *new_conn(void) fc->bdi.unplug_io_fn = default_unplug_io_fn; fc->reqctr = 0; fc->blocked = 1; + get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key)); } return fc; } |