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netfilter: nf_tables: limit maximum table name length to 32 bytes

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Set the same as we use for chain names, it should be enough.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2015-03-05 15:05:36 +01:00
parent f04e599e20
commit 1cae565e8b
3 changed files with 6 additions and 4 deletions
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2
include/net/netfilter/nf_tables.h
View File

@ -535,7 +535,7 @@ struct nft_table {
u64 hgenerator;
u32 use;
u16 flags;
char name[];
char name[NFT_TABLE_MAXNAMELEN];
};
/**

1
include/uapi/linux/netfilter/nf_tables.h
View File

@ -1,6 +1,7 @@
#ifndef _LINUX_NF_TABLES_H
#define _LINUX_NF_TABLES_H
#define NFT_TABLE_MAXNAMELEN 32
#define NFT_CHAIN_MAXNAMELEN 32
#define NFT_USERDATA_MAXLEN 256

7
net/netfilter/nf_tables_api.c
View File

@ -401,7 +401,8 @@ nf_tables_chain_type_lookup(const struct nft_af_info *afi,
}
static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
[NFTA_TABLE_NAME] = { .type = NLA_STRING },
[NFTA_TABLE_NAME] = { .type = NLA_STRING,
.len = NFT_TABLE_MAXNAMELEN - 1 },
[NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
};
@ -686,13 +687,13 @@ static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
if (!try_module_get(afi->owner))
return -EAFNOSUPPORT;
table = kzalloc(sizeof(*table) + nla_len(name), GFP_KERNEL);
table = kzalloc(sizeof(*table), GFP_KERNEL);
if (table == NULL) {
module_put(afi->owner);
return -ENOMEM;
}
nla_strlcpy(table->name, name, nla_len(name));
nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
INIT_LIST_HEAD(&table->chains);
INIT_LIST_HEAD(&table->sets);
table->flags = flags;