This is a note to let you know that I've just added the patch titled
wireguard: allowedips: expand maximum node depth
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wireguard-allowedips-expand-maximum-node-depth.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 46622219aae2b67813fe31a7b8cb7da5baff5c8a Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@xxxxxxxxx>
Date: Mon, 7 Aug 2023 15:21:27 +0200
Subject: wireguard: allowedips: expand maximum node depth
From: Jason A. Donenfeld <Jason@xxxxxxxxx>
commit 46622219aae2b67813fe31a7b8cb7da5baff5c8a upstream.
In the allowedips self-test, nodes are inserted into the tree, but it
generated an even amount of nodes, but for checking maximum node depth,
there is of course the root node, which makes the total number
necessarily odd. With two few nodes added, it never triggered the
maximum depth check like it should have. So, add 129 nodes instead of
128 nodes, and do so with a more straightforward scheme, starting with
all the bits set, and shifting over one each time. Then increase the
maximum depth to 129, and choose a better name for that variable to
make it clear that it represents depth as opposed to bits.
Cc: stable@xxxxxxxxxxxxxxx
Fixes: e7096c131e51 ("net: WireGuard secure network tunnel")
Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
Link: https://lore.kernel.org/r/20230807132146.2191597-2-Jason@xxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/wireguard/allowedips.c | 8 ++++----
drivers/net/wireguard/selftest/allowedips.c | 16 ++++++++++------
2 files changed, 14 insertions(+), 10 deletions(-)
--- a/drivers/net/wireguard/allowedips.c
+++ b/drivers/net/wireguard/allowedips.c
@@ -6,7 +6,7 @@
#include "allowedips.h"
#include "peer.h"
-enum { MAX_ALLOWEDIPS_BITS = 128 };
+enum { MAX_ALLOWEDIPS_DEPTH = 129 };
static struct kmem_cache *node_cache;
@@ -42,7 +42,7 @@ static void push_rcu(struct allowedips_n
struct allowedips_node __rcu *p, unsigned int *len)
{
if (rcu_access_pointer(p)) {
- if (WARN_ON(IS_ENABLED(DEBUG) && *len >= MAX_ALLOWEDIPS_BITS))
+ if (WARN_ON(IS_ENABLED(DEBUG) && *len >= MAX_ALLOWEDIPS_DEPTH))
return;
stack[(*len)++] = rcu_dereference_raw(p);
}
@@ -55,7 +55,7 @@ static void node_free_rcu(struct rcu_hea
static void root_free_rcu(struct rcu_head *rcu)
{
- struct allowedips_node *node, *stack[MAX_ALLOWEDIPS_BITS] = {
+ struct allowedips_node *node, *stack[MAX_ALLOWEDIPS_DEPTH] = {
container_of(rcu, struct allowedips_node, rcu) };
unsigned int len = 1;
@@ -68,7 +68,7 @@ static void root_free_rcu(struct rcu_hea
static void root_remove_peer_lists(struct allowedips_node *root)
{
- struct allowedips_node *node, *stack[MAX_ALLOWEDIPS_BITS] = { root };
+ struct allowedips_node *node, *stack[MAX_ALLOWEDIPS_DEPTH] = { root };
unsigned int len = 1;
while (len > 0 && (node = stack[--len])) {
--- a/drivers/net/wireguard/selftest/allowedips.c
+++ b/drivers/net/wireguard/selftest/allowedips.c
@@ -593,16 +593,20 @@ bool __init wg_allowedips_selftest(void)
wg_allowedips_remove_by_peer(&t, a, &mutex);
test_negative(4, a, 192, 168, 0, 1);
- /* These will hit the WARN_ON(len >= MAX_ALLOWEDIPS_BITS) in free_node
+ /* These will hit the WARN_ON(len >= MAX_ALLOWEDIPS_DEPTH) in free_node
* if something goes wrong.
*/
- for (i = 0; i < MAX_ALLOWEDIPS_BITS; ++i) {
- part = cpu_to_be64(~(1LLU << (i % 64)));
- memset(&ip, 0xff, 16);
- memcpy((u8 *)&ip + (i < 64) * 8, &part, 8);
+ for (i = 0; i < 64; ++i) {
+ part = cpu_to_be64(~0LLU << i);
+ memset(&ip, 0xff, 8);
+ memcpy((u8 *)&ip + 8, &part, 8);
+ wg_allowedips_insert_v6(&t, &ip, 128, a, &mutex);
+ memcpy(&ip, &part, 8);
+ memset((u8 *)&ip + 8, 0, 8);
wg_allowedips_insert_v6(&t, &ip, 128, a, &mutex);
}
-
+ memset(&ip, 0, 16);
+ wg_allowedips_insert_v6(&t, &ip, 128, a, &mutex);
wg_allowedips_free(&t, &mutex);
wg_allowedips_init(&t);
Patches currently in stable-queue which might be from Jason@xxxxxxxxx are
queue-6.4/wireguard-allowedips-expand-maximum-node-depth.patch
