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[SRU,OEM-6.0] netfilter: nf_tables: do not set up extensions for end interval

Message ID 20230916004839.706452-7-cengiz.can@canonical.com
State New
Headers show
Series [SRU,OEM-6.0] netfilter: nf_tables: do not set up extensions for end interval | expand

Commit Message

Cengiz Can Sept. 16, 2023, 12:48 a.m. UTC 
From: Pablo Neira Ayuso <pablo@netfilter.org>

Elements with an end interval flag set on do not store extensions. The
global set definition is currently setting on the timeout and stateful
expression for end interval elements.

This leads to skipping end interval elements from the set->ops->walk()
path as the expired check bogusly reports true.

Moreover, do not set up stateful expressions for elements with end
interval flag set on since this is never used.

Fixes: 65038428b2c6 ("netfilter: nf_tables: allow to specify stateful expression in set definition")
Fixes: 8d8540c4f5e0 ("netfilter: nft_set_rbtree: add timeout support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
(cherry picked from commit 33c7aba0b4ffd6d7cdab862a034eb582a5120a38)
CVE-2023-4244
[cengizcan: prerequisite commit]
Signed-off-by: Cengiz Can <cengiz.can@canonical.com>
---
 net/netfilter/nf_tables_api.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
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Patch

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 0a858ca7a7c4..a0f58e1f9308 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -6114,7 +6114,8 @@  static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
 					    &timeout);
 		if (err)
 			return err;
-	} else if (set->flags & NFT_SET_TIMEOUT) {
+	} else if (set->flags & NFT_SET_TIMEOUT &&
+		   !(flags & NFT_SET_ELEM_INTERVAL_END)) {
 		timeout = set->timeout;
 	}
 
@@ -6180,7 +6181,8 @@  static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
 			err = -EOPNOTSUPP;
 			goto err_set_elem_expr;
 		}
-	} else if (set->num_exprs > 0) {
+	} else if (set->num_exprs > 0 &&
+		   !(flags & NFT_SET_ELEM_INTERVAL_END)) {
 		err = nft_set_elem_expr_clone(ctx, set, expr_array);
 		if (err < 0)
 			goto err_set_elem_expr_clone;