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netfilter: nf_tables: disallow jump to implicit chain from set element

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Extend struct nft_data_desc to add a flag field that specifies
nft_data_init() is being called for set element data.

Use it to disallow jump to implicit chain from set element, only jump
to chain via immediate expression is allowed.

Fixes: d0e2c7de92 ("netfilter: nf_tables: add NFT_CHAIN_BINDING")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2022-08-08 19:30:07 +02:00
parent 341b694160
commit f323ef3a0d
2 changed files with 9 additions and 0 deletions
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5
include/net/netfilter/nf_tables.h
View File

@ -221,10 +221,15 @@ struct nft_ctx {
bool report;
};
enum nft_data_desc_flags {
NFT_DATA_DESC_SETELEM = (1 << 0),
};
struct nft_data_desc {
enum nft_data_types type;
unsigned int size;
unsigned int len;
unsigned int flags;
};
int nft_data_init(const struct nft_ctx *ctx, struct nft_data *data,

4
net/netfilter/nf_tables_api.c
View File

@ -5226,6 +5226,7 @@ static int nft_setelem_parse_data(struct nft_ctx *ctx, struct nft_set *set,
desc->type = dtype;
desc->size = NFT_DATA_VALUE_MAXLEN;
desc->len = set->dlen;
desc->flags = NFT_DATA_DESC_SETELEM;
return nft_data_init(ctx, data, desc, attr);
}
@ -9665,6 +9666,9 @@ static int nft_verdict_init(const struct nft_ctx *ctx, struct nft_data *data,
return PTR_ERR(chain);
if (nft_is_base_chain(chain))
return -EOPNOTSUPP;
if (desc->flags & NFT_DATA_DESC_SETELEM &&
chain->flags & NFT_CHAIN_BINDING)
return -EINVAL;
chain->use++;
data->verdict.chain = chain;