Commit 9ad0830f authored by David Howells's avatar David Howells Committed by Linus Torvalds
Browse files

[PATCH] Keys: Fix key serial number collision handling 



Fix the key serial number collision avoidance code in key_alloc_serial().

This didn't use to be so much of a problem as the key serial numbers were
allocated from a simple incremental counter, and it would have to go through
two billion keys before it could possibly encounter a collision.  However, now
that random numbers are used instead, collisions are much more likely.

This is fixed by finding a hole in the rbtree where the next unused serial
number ought to be and using that by going almost back to the top of the
insertion routine and redoing the insertion with the new serial number rather
than trying to be clever and attempting to work out the insertion point
pointer directly.

This fixes kernel BZ #7727.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 768c242b

security/keys/key.c

+14 −19
Original line number Diff line number Diff line
@@ -188,6 +188,7 @@ static inline void key_alloc_serial(struct key *key) 


	spin_lock(&key_serial_lock);



attempt_insertion:

	parent = NULL;

	p = &key_serial_tree.rb_node;
@@ -202,39 +203,33 @@ static inline void key_alloc_serial(struct key *key) 
		else

			goto serial_exists;

	}

	goto insert_here;



	/* we've found a suitable hole - arrange for this key to occupy it */

	rb_link_node(&key->serial_node, parent, p);

	rb_insert_color(&key->serial_node, &key_serial_tree);



	spin_unlock(&key_serial_lock);

	return;



	/* we found a key with the proposed serial number - walk the tree from

	 * that point looking for the next unused serial number */

serial_exists:

	for (;;) {

		key->serial++;

		if (key->serial < 2)

			key->serial = 2;



		if (!rb_parent(parent))

			p = &key_serial_tree.rb_node;

		else if (rb_parent(parent)->rb_left == parent)

			p = &(rb_parent(parent)->rb_left);

		else

			p = &(rb_parent(parent)->rb_right);

		if (key->serial < 3) {

			key->serial = 3;

			goto attempt_insertion;

		}



		parent = rb_next(parent);

		if (!parent)

			break;

			goto attempt_insertion;



		xkey = rb_entry(parent, struct key, serial_node);

		if (key->serial < xkey->serial)

			goto insert_here;

			goto attempt_insertion;

	}



	/* we've found a suitable hole - arrange for this key to occupy it */

insert_here:

	rb_link_node(&key->serial_node, parent, p);

	rb_insert_color(&key->serial_node, &key_serial_tree);



	spin_unlock(&key_serial_lock);



} /* end key_alloc_serial() */



/*****************************************************************************/

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