You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
47 lines
1.7 KiB
47 lines
1.7 KiB
From 1dcbf8ed6849543fcaffb8af0d50e08e27232ce2 Mon Sep 17 00:00:00 2001
|
|
From: Phil Sutter <phil@nwl.cc>
|
|
Date: Fri, 21 Jul 2023 13:14:36 +0200
|
|
Subject: [PATCH] nft: Special casing for among match in compare_matches()
|
|
|
|
When other extensions may have "garbage" appended to their data which
|
|
should not be considered for match comparison, among match is the
|
|
opposite in that it extends its data beyond the value in 'size' field.
|
|
Add special casing to cover for this, avoiding false-positive rule
|
|
comparison.
|
|
|
|
Fixes: 26753888720d8 ("nft: bridge: Rudimental among extension support")
|
|
Signed-off-by: Phil Sutter <phil@nwl.cc>
|
|
(cherry picked from commit 10583537004f7ecd4aa11f6c12b7ba73fb77fc11)
|
|
---
|
|
iptables/nft-shared.c | 7 +++++--
|
|
1 file changed, 5 insertions(+), 2 deletions(-)
|
|
|
|
diff --git a/iptables/nft-shared.c b/iptables/nft-shared.c
|
|
index ed093c07d7617..0b5745f7e82f4 100644
|
|
--- a/iptables/nft-shared.c
|
|
+++ b/iptables/nft-shared.c
|
|
@@ -911,6 +911,7 @@ bool compare_matches(struct xtables_rule_match *mt1,
|
|
for (mp1 = mt1, mp2 = mt2; mp1 && mp2; mp1 = mp1->next, mp2 = mp2->next) {
|
|
struct xt_entry_match *m1 = mp1->match->m;
|
|
struct xt_entry_match *m2 = mp2->match->m;
|
|
+ size_t cmplen = mp1->match->userspacesize;
|
|
|
|
if (strcmp(m1->u.user.name, m2->u.user.name) != 0) {
|
|
DEBUGP("mismatching match name\n");
|
|
@@ -922,8 +923,10 @@ bool compare_matches(struct xtables_rule_match *mt1,
|
|
return false;
|
|
}
|
|
|
|
- if (memcmp(m1->data, m2->data,
|
|
- mp1->match->userspacesize) != 0) {
|
|
+ if (!strcmp(m1->u.user.name, "among"))
|
|
+ cmplen = m1->u.match_size - sizeof(*m1);
|
|
+
|
|
+ if (memcmp(m1->data, m2->data, cmplen) != 0) {
|
|
DEBUGP("mismatch match data\n");
|
|
return false;
|
|
}
|
|
--
|
|
2.40.0
|
|
|