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netfilter: nf_tables: introduce nft_validate_register_load()

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Change nft_validate_input_register() to not only validate the input
register number, but also the length of the load, and rename it to
nft_validate_register_load() to reflect that change.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Patrick McHardy 2015-04-11 02:27:30 +01:00 committed by Pablo Neira Ayuso
parent 27e6d2017a
commit d07db9884a
11 changed files with 62 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/netfilter/nf_tables.h
View File

@ -112,13 +112,12 @@ static inline enum nft_registers nft_type_to_reg(enum nft_data_types type)
return type == NFT_DATA_VERDICT ? NFT_REG_VERDICT : NFT_REG_1;
}
int nft_validate_input_register(enum nft_registers reg);
int nft_validate_register_load(enum nft_registers reg, unsigned int len);
int nft_validate_register_store(const struct nft_ctx *ctx,
enum nft_registers reg,
const struct nft_data *data,
enum nft_data_types type, unsigned int len);
/**
* struct nft_userdata - user defined data associated with an object
*

13
net/netfilter/nf_tables_api.c
View File

@ -4122,22 +4122,27 @@ static int nf_tables_check_loops(const struct nft_ctx *ctx,
}
/**
* nft_validate_input_register - validate an expressions' input register
* nft_validate_register_load - validate a load from a register
*
* @reg: the register number
* @len: the length of the data
*
* Validate that the input register is one of the general purpose
* registers.
* registers and that the length of the load is within the bounds.
*/
int nft_validate_input_register(enum nft_registers reg)
int nft_validate_register_load(enum nft_registers reg, unsigned int len)
{
if (reg <= NFT_REG_VERDICT)
return -EINVAL;
if (reg > NFT_REG_MAX)
return -ERANGE;
if (len == 0)
return -EINVAL;
if (len > FIELD_SIZEOF(struct nft_data, data))
return -ERANGE;
return 0;
}
EXPORT_SYMBOL_GPL(nft_validate_input_register);
EXPORT_SYMBOL_GPL(nft_validate_register_load);
/**
* nft_validate_register_store - validate an expressions' register store

5
net/netfilter/nft_bitwise.c
View File

@ -63,10 +63,9 @@ static int nft_bitwise_init(const struct nft_ctx *ctx,
tb[NFTA_BITWISE_XOR] == NULL)
return -EINVAL;
priv->len = ntohl(nla_get_be32(tb[NFTA_BITWISE_LEN]));
priv->len = ntohl(nla_get_be32(tb[NFTA_BITWISE_LEN]));
priv->sreg = ntohl(nla_get_be32(tb[NFTA_BITWISE_SREG]));
err = nft_validate_input_register(priv->sreg);
err = nft_validate_register_load(priv->sreg, priv->len);
if (err < 0)
return err;

7
net/netfilter/nft_byteorder.c
View File

@ -96,10 +96,6 @@ static int nft_byteorder_init(const struct nft_ctx *ctx,
return -EINVAL;
}
priv->len = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_LEN]));
if (priv->len == 0 || priv->len > FIELD_SIZEOF(struct nft_data, data))
return -EINVAL;
priv->size = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_SIZE]));
switch (priv->size) {
case 2:
@ -110,7 +106,8 @@ static int nft_byteorder_init(const struct nft_ctx *ctx,
}
priv->sreg = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_SREG]));
err = nft_validate_input_register(priv->sreg);
priv->len = ntohl(nla_get_be32(tb[NFTA_BYTEORDER_LEN]));
err = nft_validate_register_load(priv->sreg, priv->len);
if (err < 0)
return err;

25
net/netfilter/nft_cmp.c
View File

@ -75,12 +75,15 @@ static int nft_cmp_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
struct nft_data_desc desc;
int err;
priv->sreg = ntohl(nla_get_be32(tb[NFTA_CMP_SREG]));
priv->op = ntohl(nla_get_be32(tb[NFTA_CMP_OP]));
err = nft_data_init(NULL, &priv->data, &desc, tb[NFTA_CMP_DATA]);
BUG_ON(err < 0);
priv->sreg = ntohl(nla_get_be32(tb[NFTA_CMP_SREG]));
err = nft_validate_register_load(priv->sreg, desc.len);
if (err < 0)
return err;
priv->op = ntohl(nla_get_be32(tb[NFTA_CMP_OP]));
priv->len = desc.len;
return 0;
}
@ -122,13 +125,17 @@ static int nft_cmp_fast_init(const struct nft_ctx *ctx,
u32 mask;
int err;
priv->sreg = ntohl(nla_get_be32(tb[NFTA_CMP_SREG]));
err = nft_data_init(NULL, &data, &desc, tb[NFTA_CMP_DATA]);
BUG_ON(err < 0);
desc.len *= BITS_PER_BYTE;
priv->sreg = ntohl(nla_get_be32(tb[NFTA_CMP_SREG]));
err = nft_validate_register_load(priv->sreg, desc.len);
if (err < 0)
return err;
desc.len *= BITS_PER_BYTE;
mask = nft_cmp_fast_mask(desc.len);
priv->data = data.data[0] & mask;
priv->len = desc.len;
return 0;
@ -167,7 +174,6 @@ nft_cmp_select_ops(const struct nft_ctx *ctx, const struct nlattr * const tb[])
{
struct nft_data_desc desc;
struct nft_data data;
enum nft_registers sreg;
enum nft_cmp_ops op;
int err;
@ -176,11 +182,6 @@ nft_cmp_select_ops(const struct nft_ctx *ctx, const struct nlattr * const tb[])
tb[NFTA_CMP_DATA] == NULL)
return ERR_PTR(-EINVAL);
sreg = ntohl(nla_get_be32(tb[NFTA_CMP_SREG]));
err = nft_validate_input_register(sreg);
if (err < 0)
return ERR_PTR(err);
op = ntohl(nla_get_be32(tb[NFTA_CMP_OP]));
switch (op) {
case NFT_CMP_EQ:

4
net/netfilter/nft_ct.c
View File

@ -324,12 +324,14 @@ static int nft_ct_set_init(const struct nft_ctx *ctx,
const struct nlattr * const tb[])
{
struct nft_ct *priv = nft_expr_priv(expr);
unsigned int len;
int err;
priv->key = ntohl(nla_get_be32(tb[NFTA_CT_KEY]));
switch (priv->key) {
#ifdef CONFIG_NF_CONNTRACK_MARK
case NFT_CT_MARK:
len = FIELD_SIZEOF(struct nf_conn, mark);
break;
#endif
default:
@ -337,7 +339,7 @@ static int nft_ct_set_init(const struct nft_ctx *ctx,
}
priv->sreg = ntohl(nla_get_be32(tb[NFTA_CT_SREG]));
err = nft_validate_input_register(priv->sreg);
err = nft_validate_register_load(priv->sreg, len);
if (err < 0)
return err;

4
net/netfilter/nft_dynset.c
View File

@ -124,7 +124,7 @@ static int nft_dynset_init(const struct nft_ctx *ctx,
}
priv->sreg_key = ntohl(nla_get_be32(tb[NFTA_DYNSET_SREG_KEY]));
err = nft_validate_input_register(priv->sreg_key);
err = nft_validate_register_load(priv->sreg_key, set->klen);;
if (err < 0)
return err;
@ -135,7 +135,7 @@ static int nft_dynset_init(const struct nft_ctx *ctx,
return -EOPNOTSUPP;
priv->sreg_data = ntohl(nla_get_be32(tb[NFTA_DYNSET_SREG_DATA]));
err = nft_validate_input_register(priv->sreg_data);
err = nft_validate_register_load(priv->sreg_data, set->dlen);
if (err < 0)
return err;
} else if (set->flags & NFT_SET_MAP)

2
net/netfilter/nft_lookup.c
View File

@ -71,7 +71,7 @@ static int nft_lookup_init(const struct nft_ctx *ctx,
}
priv->sreg = ntohl(nla_get_be32(tb[NFTA_LOOKUP_SREG]));
err = nft_validate_input_register(priv->sreg);
err = nft_validate_register_load(priv->sreg, set->klen);
if (err < 0)
return err;

6
net/netfilter/nft_meta.c
View File

@ -267,20 +267,24 @@ int nft_meta_set_init(const struct nft_ctx *ctx,
const struct nlattr * const tb[])
{
struct nft_meta *priv = nft_expr_priv(expr);
unsigned int len;
int err;
priv->key = ntohl(nla_get_be32(tb[NFTA_META_KEY]));
switch (priv->key) {
case NFT_META_MARK:
case NFT_META_PRIORITY:
len = sizeof(u32);
break;
case NFT_META_NFTRACE:
len = sizeof(u8);
break;
default:
return -EOPNOTSUPP;
}
priv->sreg = ntohl(nla_get_be32(tb[NFTA_META_SREG]));
err = nft_validate_input_register(priv->sreg);
err = nft_validate_register_load(priv->sreg, len);
if (err < 0)
return err;

26
net/netfilter/nft_nat.c
View File

@ -119,6 +119,7 @@ static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_nat *priv = nft_expr_priv(expr);
unsigned int alen, plen;
u32 family;
int err;
@ -146,17 +147,25 @@ static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
return -EINVAL;
family = ntohl(nla_get_be32(tb[NFTA_NAT_FAMILY]));
if (family != AF_INET && family != AF_INET6)
return -EAFNOSUPPORT;
if (family != ctx->afi->family)
return -EOPNOTSUPP;
switch (family) {
case NFPROTO_IPV4:
alen = FIELD_SIZEOF(struct nf_nat_range, min_addr.ip);
break;
case NFPROTO_IPV6:
alen = FIELD_SIZEOF(struct nf_nat_range, min_addr.ip6);
break;
default:
return -EAFNOSUPPORT;
}
priv->family = family;
if (tb[NFTA_NAT_REG_ADDR_MIN]) {
priv->sreg_addr_min =
ntohl(nla_get_be32(tb[NFTA_NAT_REG_ADDR_MIN]));
err = nft_validate_input_register(priv->sreg_addr_min);
err = nft_validate_register_load(priv->sreg_addr_min, alen);
if (err < 0)
return err;
@ -164,7 +173,8 @@ static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
priv->sreg_addr_max =
ntohl(nla_get_be32(tb[NFTA_NAT_REG_ADDR_MAX]));
err = nft_validate_input_register(priv->sreg_addr_max);
err = nft_validate_register_load(priv->sreg_addr_max,
alen);
if (err < 0)
return err;
} else {
@ -172,11 +182,12 @@ static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
}
}
plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all);
if (tb[NFTA_NAT_REG_PROTO_MIN]) {
priv->sreg_proto_min =
ntohl(nla_get_be32(tb[NFTA_NAT_REG_PROTO_MIN]));
err = nft_validate_input_register(priv->sreg_proto_min);
err = nft_validate_register_load(priv->sreg_proto_min, plen);
if (err < 0)
return err;
@ -184,7 +195,8 @@ static int nft_nat_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
priv->sreg_proto_max =
ntohl(nla_get_be32(tb[NFTA_NAT_REG_PROTO_MAX]));
err = nft_validate_input_register(priv->sreg_proto_max);
err = nft_validate_register_load(priv->sreg_proto_max,
plen);
if (err < 0)
return err;
} else {

7
net/netfilter/nft_redir.c
View File

@ -44,17 +44,19 @@ int nft_redir_init(const struct nft_ctx *ctx,
const struct nlattr * const tb[])
{
struct nft_redir *priv = nft_expr_priv(expr);
unsigned int plen;
int err;
err = nft_redir_validate(ctx, expr, NULL);
if (err < 0)
return err;
plen = FIELD_SIZEOF(struct nf_nat_range, min_addr.all);
if (tb[NFTA_REDIR_REG_PROTO_MIN]) {
priv->sreg_proto_min =
ntohl(nla_get_be32(tb[NFTA_REDIR_REG_PROTO_MIN]));
err = nft_validate_input_register(priv->sreg_proto_min);
err = nft_validate_register_load(priv->sreg_proto_min, plen);
if (err < 0)
return err;
@ -62,7 +64,8 @@ int nft_redir_init(const struct nft_ctx *ctx,
priv->sreg_proto_max =
ntohl(nla_get_be32(tb[NFTA_REDIR_REG_PROTO_MAX]));
err = nft_validate_input_register(priv->sreg_proto_max);
err = nft_validate_register_load(priv->sreg_proto_max,
plen);
if (err < 0)
return err;
} else {