From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: davem@davemloft.net, netdev@vger.kernel.org
Subject: [PATCH 13/17] netfilter: nf_tables: validate NFT_DATA_VALUE after nft_data_init()
Date: Mon, 9 Dec 2019 20:26:34 +0100 [thread overview]
Message-ID: <20191209192638.71184-14-pablo@netfilter.org> (raw)
In-Reply-To: <20191209192638.71184-1-pablo@netfilter.org>
Userspace might bogusly sent NFT_DATA_VERDICT in several netlink
attributes that assume NFT_DATA_VALUE. Moreover, make sure that error
path invokes nft_data_release() to decrement the reference count on the
chain object.
Fixes: 96518518cc41 ("netfilter: add nftables")
Fixes: 0f3cd9b36977 ("netfilter: nf_tables: add range expression")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
net/netfilter/nf_tables_api.c | 4 +++-
net/netfilter/nft_bitwise.c | 4 ++--
net/netfilter/nft_cmp.c | 6 ++++++
net/netfilter/nft_range.c | 10 ++++++++++
4 files changed, 21 insertions(+), 3 deletions(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 0db2784fee9a..72a7816ba761 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -4519,8 +4519,10 @@ static int nft_get_set_elem(struct nft_ctx *ctx, struct nft_set *set,
return err;
err = -EINVAL;
- if (desc.type != NFT_DATA_VALUE || desc.len != set->klen)
+ if (desc.type != NFT_DATA_VALUE || desc.len != set->klen) {
+ nft_data_release(&elem.key.val, desc.type);
return err;
+ }
priv = set->ops->get(ctx->net, set, &elem, flags);
if (IS_ERR(priv))
diff --git a/net/netfilter/nft_bitwise.c b/net/netfilter/nft_bitwise.c
index 02afa752dd2e..10e9d50e4e19 100644
--- a/net/netfilter/nft_bitwise.c
+++ b/net/netfilter/nft_bitwise.c
@@ -80,7 +80,7 @@ static int nft_bitwise_init(const struct nft_ctx *ctx,
tb[NFTA_BITWISE_MASK]);
if (err < 0)
return err;
- if (d1.len != priv->len) {
+ if (d1.type != NFT_DATA_VALUE || d1.len != priv->len) {
err = -EINVAL;
goto err1;
}
@@ -89,7 +89,7 @@ static int nft_bitwise_init(const struct nft_ctx *ctx,
tb[NFTA_BITWISE_XOR]);
if (err < 0)
goto err1;
- if (d2.len != priv->len) {
+ if (d2.type != NFT_DATA_VALUE || d2.len != priv->len) {
err = -EINVAL;
goto err2;
}
diff --git a/net/netfilter/nft_cmp.c b/net/netfilter/nft_cmp.c
index b8092069f868..8a28c127effc 100644
--- a/net/netfilter/nft_cmp.c
+++ b/net/netfilter/nft_cmp.c
@@ -81,6 +81,12 @@ static int nft_cmp_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
if (err < 0)
return err;
+ if (desc.type != NFT_DATA_VALUE) {
+ err = -EINVAL;
+ nft_data_release(&priv->data, desc.type);
+ return err;
+ }
+
priv->sreg = nft_parse_register(tb[NFTA_CMP_SREG]);
err = nft_validate_register_load(priv->sreg, desc.len);
if (err < 0)
diff --git a/net/netfilter/nft_range.c b/net/netfilter/nft_range.c
index 4701fa8a45e7..89efcc5a533d 100644
--- a/net/netfilter/nft_range.c
+++ b/net/netfilter/nft_range.c
@@ -66,11 +66,21 @@ static int nft_range_init(const struct nft_ctx *ctx, const struct nft_expr *expr
if (err < 0)
return err;
+ if (desc_from.type != NFT_DATA_VALUE) {
+ err = -EINVAL;
+ goto err1;
+ }
+
err = nft_data_init(NULL, &priv->data_to, sizeof(priv->data_to),
&desc_to, tb[NFTA_RANGE_TO_DATA]);
if (err < 0)
goto err1;
+ if (desc_to.type != NFT_DATA_VALUE) {
+ err = -EINVAL;
+ goto err2;
+ }
+
if (desc_from.len != desc_to.len) {
err = -EINVAL;
goto err2;
--
2.11.0
next prev parent reply other threads:[~2019-12-09 19:27 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-09 19:26 [PATCH 00/17] Netfilter fixes for net Pablo Neira Ayuso
2019-12-09 19:26 ` [PATCH 01/17] netfilter: ctnetlink: netns exit must wait for callbacks Pablo Neira Ayuso
2019-12-09 19:26 ` [PATCH 02/17] netfilter: nf_flow_table_offload: Fix block setup as TC_SETUP_FT cmd Pablo Neira Ayuso
2019-12-09 19:26 ` [PATCH 03/17] netfilter: nf_flow_table_offload: Fix block_cb tc_setup_type as TC_SETUP_CLSFLOWER Pablo Neira Ayuso
2019-12-09 19:26 ` [PATCH 04/17] netfilter: nf_flow_table_offload: Don't use offset uninitialized in flow_offload_port_{d,s}nat Pablo Neira Ayuso
2019-12-09 19:26 ` [PATCH 05/17] netfilter: conntrack: tell compiler to not inline nf_ct_resolve_clash Pablo Neira Ayuso
2019-12-09 19:26 ` [PATCH 06/17] netfilter: nf_flow_table_offload: add IPv6 match description Pablo Neira Ayuso
2019-12-09 19:26 ` [PATCH 07/17] netfilter: nf_tables_offload: Check for the NETDEV_UNREGISTER event Pablo Neira Ayuso
2019-12-09 19:26 ` [PATCH 08/17] selftests: netfilter: use randomized netns names Pablo Neira Ayuso
2019-12-09 19:26 ` [PATCH 09/17] netfilter: nf_queue: enqueue skbs with NULL dst Pablo Neira Ayuso
2019-12-09 19:26 ` [PATCH 10/17] netfilter: uapi: Avoid undefined left-shift in xt_sctp.h Pablo Neira Ayuso
2019-12-09 19:26 ` [PATCH 11/17] netfilter: nft_set_rbtree: bogus lookup/get on consecutive elements in named sets Pablo Neira Ayuso
2019-12-09 19:26 ` [PATCH 12/17] netfilter: nf_tables: validate NFT_SET_ELEM_INTERVAL_END Pablo Neira Ayuso
2019-12-09 19:26 ` Pablo Neira Ayuso [this message]
2019-12-09 19:26 ` [PATCH 14/17] netfilter: nf_tables: skip module reference count bump on object updates Pablo Neira Ayuso
2019-12-09 19:26 ` [PATCH 15/17] netfilter: nf_tables_offload: return EOPNOTSUPP if rule specifies no actions Pablo Neira Ayuso
2019-12-09 19:26 ` [PATCH 16/17] netfilter: bridge: make sure to pull arp header in br_nf_forward_arp() Pablo Neira Ayuso
2019-12-09 19:26 ` [PATCH 17/17] netfilter: nf_flow_table_offload: Correct memcpy size for flow_overload_mangle() Pablo Neira Ayuso
2019-12-09 22:03 ` [PATCH 00/17] Netfilter fixes for net David Miller
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20191209192638.71184-14-pablo@netfilter.org \
--to=pablo@netfilter.org \
--cc=davem@davemloft.net \
--cc=netdev@vger.kernel.org \
--cc=netfilter-devel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox