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netfilter: nf_tables: sanitize nft_set_desc_concat_parse()

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commit fecf31ee395b0295f2d7260aa29946b7605f7c85 upstream.

Add several sanity checks for nft_set_desc_concat_parse():

- validate desc->field_count not larger than desc->field_len array.
- field length cannot be larger than desc->field_len (ie. U8_MAX)
- total length of the concatenation cannot be larger than register array.

Joint work with Florian Westphal.

Fixes: f3a2181e16 ("netfilter: nf_tables: Support for sets with multiple ranged fields")
Reported-by: <zhangziming.zzm@antgroup.com>
Reviewed-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pablo Neira Ayuso 2022-05-27 09:56:18 +02:00 committed by Greg Kroah-Hartman
parent 44f1ce5530
commit c0aff1faf6
1 changed files with 13 additions and 4 deletions
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17
net/netfilter/nf_tables_api.c
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@ -4051,6 +4051,9 @@ static int nft_set_desc_concat_parse(const struct nlattr *attr,
u32 len;
int err;
if (desc->field_count >= ARRAY_SIZE(desc->field_len))
return -E2BIG;
err = nla_parse_nested_deprecated(tb, NFTA_SET_FIELD_MAX, attr,
nft_concat_policy, NULL);
if (err < 0)
@ -4060,9 +4063,8 @@ static int nft_set_desc_concat_parse(const struct nlattr *attr,
return -EINVAL;
len = ntohl(nla_get_be32(tb[NFTA_SET_FIELD_LEN]));
if (len * BITS_PER_BYTE / 32 > NFT_REG32_COUNT)
return -E2BIG;
if (!len || len > U8_MAX)
return -EINVAL;
desc->field_len[desc->field_count++] = len;
@ -4073,7 +4075,8 @@ static int nft_set_desc_concat(struct nft_set_desc *desc,
const struct nlattr *nla)
{
struct nlattr *attr;
int rem, err;
u32 num_regs = 0;
int rem, err, i;
nla_for_each_nested(attr, nla, rem) {
if (nla_type(attr) != NFTA_LIST_ELEM)
@ -4084,6 +4087,12 @@ static int nft_set_desc_concat(struct nft_set_desc *desc,
return err;
}
for (i = 0; i < desc->field_count; i++)
num_regs += DIV_ROUND_UP(desc->field_len[i], sizeof(u32));
if (num_regs > NFT_REG32_COUNT)
return -E2BIG;
return 0;
}