summaryrefslogtreecommitdiffstats
path: root/fs/fuse/inode.c
diff options
context:
space:
mode:
authorMiklos Szeredi2006-06-25 14:48:55 +0200
committerLinus Torvalds2006-06-25 19:01:20 +0200
commit9c8ef5614da22666e339b125263d315cfaa89109 (patch)
tree860044f1b2c0c6189143b1c9daf263bd8ff5e5e0 /fs/fuse/inode.c
parent[PATCH] fuse: add request interruption (diff)
downloadkernel-qcow2-linux-9c8ef5614da22666e339b125263d315cfaa89109.tar.gz
kernel-qcow2-linux-9c8ef5614da22666e339b125263d315cfaa89109.tar.xz
kernel-qcow2-linux-9c8ef5614da22666e339b125263d315cfaa89109.zip
[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.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index e21ef8a3ad30..5ceb8bd7a189 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;
}