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[PATCH] fuse: scramble lock owner ID

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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>
This commit is contained in:
Miklos Szeredi
2006-06-25 05:48:55 -07:00
committed by Linus Torvalds
parent a4d27e75ff
commit 9c8ef5614d
3 changed files with 25 additions and 9 deletions
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2
fs/fuse/inode.c
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@@ -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;
}