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List: netfilter-devel
Subject: [PATCH 4.14 63/86] netfilter: nf_tables: validate registers coming from userspace.
From: Greg Kroah-Hartman <gregkh () linuxfoundation ! org>
Date: 2023-05-28 19:10:37
Message-ID: 20230528190830.961163230 () linuxfoundation ! org
[Download RAW message or body]
From: Pablo Neira Ayuso <pablo@netfilter.org>
[ 6e1acfa387b9ff82cfc7db8cc3b6959221a95851 ]
Bail out in case userspace uses unsupported registers.
Fixes: 49499c3e6e18 ("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>
---
net/netfilter/nf_tables_api.c | 31 +++++++++++++++++--------------
1 file changed, 17 insertions(+), 14 deletions(-)
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -5615,26 +5615,23 @@ int nft_parse_u32_check(const struct nla
}
EXPORT_SYMBOL_GPL(nft_parse_u32_check);
-/**
- * nft_parse_register - parse a register value from a netlink attribute
- *
- * @attr: netlink attribute
- *
- * Parse and translate a register value from a netlink attribute.
- * Registers used to be 128 bit wide, these register numbers will be
- * mapped to the corresponding 32 bit register numbers.
- */
-static unsigned int nft_parse_register(const struct nlattr *attr)
+static 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;
}
/**
@@ -5685,7 +5682,10 @@ int nft_parse_register_load(const struct
u32 reg;
int err;
- reg = nft_parse_register(attr);
+ err = nft_parse_register(attr, ®);
+ if (err < 0)
+ return err;
+
err = nft_validate_register_load(reg, len);
if (err < 0)
return err;
@@ -5761,7 +5761,10 @@ int nft_parse_register_store(const struc
int err;
u32 reg;
- reg = nft_parse_register(attr);
+ err = nft_parse_register(attr, ®);
+ if (err < 0)
+ return err;
+
err = nft_validate_register_store(ctx, reg, data, type, len);
if (err < 0)
return err;
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