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netfilter: nf_tables: validate registers coming from userspace. 

Bail out in case userspace uses unsupported registers.

Fixes: 49499c3e6e ("netfilter: nf_tables: switch registers to 32 bit addressing")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2022-03-17 11:59:26 +01:00
parent 0492d85763
commit 6e1acfa387
1 changed files with 17 additions and 5 deletions
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22
net/netfilter/nf_tables_api.c
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@ -9275,17 +9275,23 @@ int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
}
EXPORT_SYMBOL_GPL(nft_parse_u32_check);
static unsigned int nft_parse_register(const struct nlattr *attr)
static unsigned int nft_parse_register(const struct nlattr *attr, u32 *preg)
{
unsigned int reg;
reg = ntohl(nla_get_be32(attr));
switch (reg) {
case NFT_REG_VERDICT...NFT_REG_4:
return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
*preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
break;
case NFT_REG32_00...NFT_REG32_15:
*preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
break;
default:
return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
return -ERANGE;
}
return 0;
}
/**
@ -9327,7 +9333,10 @@ int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
u32 reg;
int err;
reg = nft_parse_register(attr);
err = nft_parse_register(attr, &reg);
if (err < 0)
return err;
err = nft_validate_register_load(reg, len);
if (err < 0)
return err;
@ -9382,7 +9391,10 @@ int nft_parse_register_store(const struct nft_ctx *ctx,
int err;
u32 reg;
reg = nft_parse_register(attr);
err = nft_parse_register(attr, &reg);
if (err < 0)
return err;
err = nft_validate_register_store(ctx, reg, data, type, len);
if (err < 0)
return err;