From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Florian Westphal <fw@strlen.de>,
syzbot+0e63ae76d117ae1c3a01@syzkaller.appspotmail.com,
Pablo Neira Ayuso <pablo@netfilter.org>,
Sasha Levin <sashal@kernel.org>,
netfilter-devel@vger.kernel.org, coreteam@netfilter.org,
netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 5.4 093/107] netfilter: nf_tables: remove WARN and add NLA_STRING upper limits
Date: Fri, 24 Jan 2020 09:18:03 -0500 [thread overview]
Message-ID: <20200124141817.28793-93-sashal@kernel.org> (raw)
In-Reply-To: <20200124141817.28793-1-sashal@kernel.org>
From: Florian Westphal <fw@strlen.de>
[ Upstream commit 9332d27d7918182add34e8043f6a754530fdd022 ]
This WARN can trigger because some of the names fed to the module
autoload function can be of arbitrary length.
Remove the WARN and add limits for all NLA_STRING attributes.
Reported-by: syzbot+0e63ae76d117ae1c3a01@syzkaller.appspotmail.com
Fixes: 452238e8d5ffd8 ("netfilter: nf_tables: add and use helper for module autoload")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/netfilter/nf_tables_api.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index b0cd1cee412b2..6fa315b73a66a 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -22,6 +22,8 @@
#include <net/net_namespace.h>
#include <net/sock.h>
+#define NFT_MODULE_AUTOLOAD_LIMIT (MODULE_NAME_LEN - sizeof("nft-expr-255-"))
+
static LIST_HEAD(nf_tables_expressions);
static LIST_HEAD(nf_tables_objects);
static LIST_HEAD(nf_tables_flowtables);
@@ -519,7 +521,7 @@ static void nft_request_module(struct net *net, const char *fmt, ...)
va_start(args, fmt);
ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
va_end(args);
- if (WARN(ret >= MODULE_NAME_LEN, "truncated: '%s' (len %d)", module_name, ret))
+ if (ret >= MODULE_NAME_LEN)
return;
mutex_unlock(&net->nft.commit_mutex);
@@ -1175,7 +1177,8 @@ static const struct nla_policy nft_chain_policy[NFTA_CHAIN_MAX + 1] = {
.len = NFT_CHAIN_MAXNAMELEN - 1 },
[NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
[NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
- [NFTA_CHAIN_TYPE] = { .type = NLA_STRING },
+ [NFTA_CHAIN_TYPE] = { .type = NLA_STRING,
+ .len = NFT_MODULE_AUTOLOAD_LIMIT },
[NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
[NFTA_CHAIN_FLAGS] = { .type = NLA_U32 },
};
@@ -2089,7 +2092,8 @@ static const struct nft_expr_type *nft_expr_type_get(struct net *net,
}
static const struct nla_policy nft_expr_policy[NFTA_EXPR_MAX + 1] = {
- [NFTA_EXPR_NAME] = { .type = NLA_STRING },
+ [NFTA_EXPR_NAME] = { .type = NLA_STRING,
+ .len = NFT_MODULE_AUTOLOAD_LIMIT },
[NFTA_EXPR_DATA] = { .type = NLA_NESTED },
};
@@ -3932,7 +3936,8 @@ static const struct nla_policy nft_set_elem_policy[NFTA_SET_ELEM_MAX + 1] = {
[NFTA_SET_ELEM_USERDATA] = { .type = NLA_BINARY,
.len = NFT_USERDATA_MAXLEN },
[NFTA_SET_ELEM_EXPR] = { .type = NLA_NESTED },
- [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING },
+ [NFTA_SET_ELEM_OBJREF] = { .type = NLA_STRING,
+ .len = NFT_OBJ_MAXNAMELEN - 1 },
};
static const struct nla_policy nft_set_elem_list_policy[NFTA_SET_ELEM_LIST_MAX + 1] = {
--
2.20.1
next prev parent reply other threads:[~2020-01-24 14:32 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200124141817.28793-1-sashal@kernel.org>
2020-01-24 14:17 ` [PATCH AUTOSEL 5.4 059/107] netfilter: fix a use-after-free in mtype_destroy() Sasha Levin
2020-01-24 14:17 ` [PATCH AUTOSEL 5.4 060/107] netfilter: arp_tables: init netns pointer in xt_tgdtor_param struct Sasha Levin
2020-01-24 14:18 ` [PATCH AUTOSEL 5.4 090/107] netfilter: nf_tables: store transaction list locally while requesting module Sasha Levin
2020-01-24 14:18 ` [PATCH AUTOSEL 5.4 091/107] netfilter: nft_tunnel: fix null-attribute check Sasha Levin
2020-01-24 14:18 ` [PATCH AUTOSEL 5.4 092/107] netfilter: nft_tunnel: ERSPAN_VERSION must not be null Sasha Levin
2020-01-24 14:18 ` Sasha Levin [this message]
2020-01-24 14:18 ` [PATCH AUTOSEL 5.4 094/107] netfilter: nf_tables: fix flowtable list del corruption Sasha Levin
2020-01-24 14:18 ` [PATCH AUTOSEL 5.4 095/107] netfilter: nat: fix ICMP header corruption on ICMP errors Sasha Levin
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