From: Pablo Neira Ayuso pablo@netfilter.org
[ Upstream commit f6594c372afd5cec8b1e9ee9ea8f8819d59c6fb1 ]
If a ruleset declares a set name that matches an existing set in the kernel, then validate that this declaration really refers to the same set, otherwise bail out with EEXIST.
Currently, the kernel reports success when adding a set that already exists in the kernel. This usually results in EINVAL errors at a later stage, when the user adds elements to the set, if the set declaration mismatches the existing set representation in the kernel.
Add a new function to check that the set declaration really refers to the same existing set in the kernel.
Fixes: 96518518cc41 ("netfilter: add nftables") Reported-by: Florian Westphal fw@strlen.de Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/netfilter/nf_tables_api.c | 36 ++++++++++++++++++++++++++++++++++- 1 file changed, 35 insertions(+), 1 deletion(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 9f35a249c2c3..6e68cab474c2 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -4393,6 +4393,34 @@ static int nft_set_expr_alloc(struct nft_ctx *ctx, struct nft_set *set, return err; }
+static bool nft_set_is_same(const struct nft_set *set, + const struct nft_set_desc *desc, + struct nft_expr *exprs[], u32 num_exprs, u32 flags) +{ + int i; + + if (set->ktype != desc->ktype || + set->dtype != desc->dtype || + set->flags != flags || + set->klen != desc->klen || + set->dlen != desc->dlen || + set->field_count != desc->field_count || + set->num_exprs != num_exprs) + return false; + + for (i = 0; i < desc->field_count; i++) { + if (set->field_len[i] != desc->field_len[i]) + return false; + } + + for (i = 0; i < num_exprs; i++) { + if (set->exprs[i]->ops != exprs[i]->ops) + return false; + } + + return true; +} + static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info, const struct nlattr * const nla[]) { @@ -4547,10 +4575,16 @@ static int nf_tables_newset(struct sk_buff *skb, const struct nfnl_info *info, if (err < 0) return err;
+ err = 0; + if (!nft_set_is_same(set, &desc, exprs, num_exprs, flags)) { + NL_SET_BAD_ATTR(extack, nla[NFTA_SET_NAME]); + err = -EEXIST; + } + for (i = 0; i < num_exprs; i++) nft_expr_destroy(&ctx, exprs[i]);
- return 0; + return err; }
if (!(info->nlh->nlmsg_flags & NLM_F_CREATE))