CVE-2017-12193 (C, published 2017-11-22T18:29Z)
Description: value: The assoc_array_insert_into_terminal_node function in lib/assoc_array.c in the Linux kernel before 4.13.11 mishandles node splitting, which allows local users to cause a denial of service (NULL pointer dereference and panic) via a crafted application, as demonstrated by the keyring key type, and key addition and link creation operations.
Severity: MEDIUM (CVSS v3 base score: 5.5)
Weakness: CWE-476 \u2014 NULL Pointer Dereference
The product dereferences a pointer that it expects to be valid but is NULL.
Repository: https://github.com/torvalds/linux
Files changed:
lib/assoc_array.c
Commit message: assoc_array: Fix a buggy node-splitting case

This fixes CVE-2017-12193.

Fix a case in the assoc_array implementation in which a new leaf is
added that needs to go into a node that happens to be full, where the
existing leaves in that node cluster together at that level to the
exclusion of new leaf.

What needs to happen is that the existing leaves get moved out to a new
node, N1, at level + 1 and the existing node needs replacing with one,
N0, that has pointers to the new leaf and to N1.

The code that tries to do this gets this wrong in two ways:

 (1) The pointer that should've pointed from N0 to N1 is set to point
     recursively to N0 instead.

 (2) The backpointer from N0 needs to be set correctly in the case N0 is
     either the root node or reached through a shortcut.

Fix this by removing this path and using the split_node path instead,
which achieves the same end, but in a more general way (thanks to Eric
Biggers for spotting the redundancy).

The problem manifests itself as:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
  IP: assoc_array_apply_edit+0x59/0xe5

Fixes: 3cb989501c26 ("Add a generic associative array implementation.")
Reported-and-tested-by: WU Fan <u3536072@connect.hku.hk>
Signed-off-by: David Howells <dhowells@redhat.com>
Cc: stable@vger.kernel.org [v3.13-rc1+]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>


Vulnerable code:
		/* Otherwise we can just insert a new node ahead of the old
		 * one.
		goto present_leaves_cluster_but_not_new_leaf;
	/* We need to split the current node; we know that the node doesn't
	 * simply contain a full set of leaves that cluster together (it
	 * contains meta pointers and/or non-clustering leaves).
	 * leaves in the node and the new leaf.
present_leaves_cluster_but_not_new_leaf:
	/* All the old leaves cluster in the same slot, but the new leaf wants
	 * to go into a different slot, so we create a new node to hold the new
	 * leaf and a pointer to a new node holding all the old leaves.
	 */
	pr_devel("present leaves cluster but not new leaf\n");

	new_n0->back_pointer = node->back_pointer;
	new_n0->parent_slot = node->parent_slot;
	new_n0->nr_leaves_on_branch = node->nr_leaves_on_branch;
	new_n1->back_pointer = assoc_array_node_to_ptr(new_n0);
	new_n1->parent_slot = edit->segment_cache[0];
	new_n1->nr_leaves_on_branch = node->nr_leaves_on_branch;
	edit->adjust_count_on = new_n0;

	for (i = 0; i < ASSOC_ARRAY_FAN_OUT; i++)
		new_n1->slots[i] = node->slots[i];

	new_n0->slots[edit->segment_cache[0]] = assoc_array_node_to_ptr(new_n0);
	edit->leaf_p = &new_n0->slots[edit->segment_cache[ASSOC_ARRAY_FAN_OUT]];

	edit->set[0].ptr = &assoc_array_ptr_to_node(node->back_pointer)->slots[node->parent_slot];
	edit->set[0].to = assoc_array_node_to_ptr(new_n0);
	edit->excised_meta[0] = assoc_array_node_to_ptr(node);
	pr_devel("<--%s() = ok [insert node before]\n", __func__);
	return true;


Fixed code:
		/* Otherwise all the old leaves cluster in the same slot, but
		 * the new leaf wants to go into a different slot - so we
		 * create a new node (n0) to hold the new leaf and a pointer to
		 * a new node (n1) holding all the old leaves.
		 *
		 * This can be done by falling through to the node splitting
		 * path.
		pr_devel("present leaves cluster but not new leaf\n");
	/* We need to split the current node.  The node must contain anything
	 * from a single leaf (in the one leaf case, this leaf will cluster
	 * with the new leaf) and the rest meta-pointers, to all leaves, some
	 * of which may cluster.
	 *
	 * It won't contain the case in which all the current leaves plus the
	 * new leaves want to cluster in the same slot.
	 * leaves in the node and the new leaf.  The current meta pointers can
	 * just be copied as they shouldn't cluster with any of the leaves.