tree 860044f1b2c0c6189143b1c9daf263bd8ff5e5e0
parent a4d27e75ffb7b8ecb7eed0c7db0df975525f3fd7
author Miklos Szeredi <miklos@szeredi.hu> 1151239735 -0700
committer Linus Torvalds <torvalds@g5.osdl.org> 1151254880 -0700

[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>