netdev - [PATCH 16/16] netfilter: nf_tables: check if same extensions are set when adding elements

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed,  3 May 2017 11:32:11 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     netfilter-devel@...r.kernel.org
Cc:     davem@...emloft.net, netdev@...r.kernel.org
Subject: [PATCH 16/16] netfilter: nf_tables: check if same extensions are set when adding elements

If no NLM_F_EXCL is set and the element already exists in the set, make
sure that both elements have the same extensions.

Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
 net/netfilter/nf_tables_api.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 434c739dfeca..11a96e8dd3cd 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -3749,6 +3749,11 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
 	err = set->ops->insert(ctx->net, set, &elem, &ext2);
 	if (err) {
 		if (err == -EEXIST) {
+			if (nft_set_ext_exists(ext, NFT_SET_EXT_DATA) ^
+			    nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) ||
+			    nft_set_ext_exists(ext, NFT_SET_EXT_OBJREF) ^
+			    nft_set_ext_exists(ext2, NFT_SET_EXT_OBJREF))
+				return -EBUSY;
 			if ((nft_set_ext_exists(ext, NFT_SET_EXT_DATA) &&
 			     nft_set_ext_exists(ext2, NFT_SET_EXT_DATA) &&
 			     memcmp(nft_set_ext_data(ext),
-- 
2.1.4