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netfilter: nf_tables: validate registers coming from userspace.
commit6e1acfa387
upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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fafb904156
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1 changed files with 17 additions and 5 deletions
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@ -9208,17 +9208,23 @@ int nft_parse_u32_check(const struct nlattr *attr, int max, u32 *dest)
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}
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EXPORT_SYMBOL_GPL(nft_parse_u32_check);
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static unsigned int nft_parse_register(const struct nlattr *attr)
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static unsigned int nft_parse_register(const struct nlattr *attr, u32 *preg)
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{
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unsigned int reg;
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reg = ntohl(nla_get_be32(attr));
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switch (reg) {
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case NFT_REG_VERDICT...NFT_REG_4:
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return reg * NFT_REG_SIZE / NFT_REG32_SIZE;
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*preg = reg * NFT_REG_SIZE / NFT_REG32_SIZE;
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break;
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case NFT_REG32_00...NFT_REG32_15:
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*preg = reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
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break;
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default:
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return reg + NFT_REG_SIZE / NFT_REG32_SIZE - NFT_REG32_00;
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return -ERANGE;
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}
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return 0;
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}
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/**
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@ -9260,7 +9266,10 @@ int nft_parse_register_load(const struct nlattr *attr, u8 *sreg, u32 len)
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u32 reg;
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int err;
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reg = nft_parse_register(attr);
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err = nft_parse_register(attr, ®);
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if (err < 0)
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return err;
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err = nft_validate_register_load(reg, len);
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if (err < 0)
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return err;
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@ -9315,7 +9324,10 @@ int nft_parse_register_store(const struct nft_ctx *ctx,
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int err;
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u32 reg;
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reg = nft_parse_register(attr);
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err = nft_parse_register(attr, ®);
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if (err < 0)
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return err;
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err = nft_validate_register_store(ctx, reg, data, type, len);
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if (err < 0)
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return err;
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