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authorPablo Neira Ayuso <pablo@netfilter.org>2011-01-06 22:25:00 +0300
committerDavid S. Miller <davem@davemloft.net>2011-01-06 22:25:00 +0300
commitcba85b532e4aabdb97f44c18987d45141fd93faa (patch)
tree785e2a715a922c36b15e1929473498e3b3aae724 /net
parentf682cefa5ad204d3bfaa54a58046c66d2d035ac1 (diff)
downloadlinux-cba85b532e4aabdb97f44c18987d45141fd93faa.tar.xz
netfilter: fix export secctx error handling
In 1ae4de0cdf855305765592647025bde55e85e451, the secctx was exported via the /proc/net/netfilter/nf_conntrack and ctnetlink interfaces instead of the secmark. That patch introduced the use of security_secid_to_secctx() which may return a non-zero value on error. In one of my setups, I have NF_CONNTRACK_SECMARK enabled but no security modules. Thus, security_secid_to_secctx() returns a negative value that results in the breakage of the /proc and `conntrack -L' outputs. To fix this, we skip the inclusion of secctx if the aforementioned function fails. This patch also fixes the dynamic netlink message size calculation if security_secid_to_secctx() returns an error, since its logic is also wrong. This problem exists in Linux kernel >= 2.6.37. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c2
-rw-r--r--net/netfilter/nf_conntrack_netlink.c25
-rw-r--r--net/netfilter/nf_conntrack_standalone.c2
3 files changed, 16 insertions, 13 deletions
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
index 37f8adb68c79..63f60fc5d26a 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
@@ -97,7 +97,7 @@ static int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
if (ret)
- return ret;
+ return 0;
ret = seq_printf(s, "secctx=%s ", secctx);
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index b729ace1dcc1..0cdba50c0d69 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -254,7 +254,7 @@ ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
if (ret)
- return ret;
+ return 0;
ret = -1;
nest_secctx = nla_nest_start(skb, CTA_SECCTX | NLA_F_NESTED);
@@ -453,16 +453,22 @@ ctnetlink_counters_size(const struct nf_conn *ct)
;
}
-#ifdef CONFIG_NF_CONNTRACK_SECMARK
-static int ctnetlink_nlmsg_secctx_size(const struct nf_conn *ct)
+static inline int
+ctnetlink_secctx_size(const struct nf_conn *ct)
{
- int len;
+#ifdef CONFIG_NF_CONNTRACK_SECMARK
+ int len, ret;
- security_secid_to_secctx(ct->secmark, NULL, &len);
+ ret = security_secid_to_secctx(ct->secmark, NULL, &len);
+ if (ret)
+ return 0;
- return sizeof(char) * len;
-}
+ return nla_total_size(0) /* CTA_SECCTX */
+ + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
+#else
+ return 0;
#endif
+}
static inline size_t
ctnetlink_nlmsg_size(const struct nf_conn *ct)
@@ -479,10 +485,7 @@ ctnetlink_nlmsg_size(const struct nf_conn *ct)
+ nla_total_size(0) /* CTA_PROTOINFO */
+ nla_total_size(0) /* CTA_HELP */
+ nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
-#ifdef CONFIG_NF_CONNTRACK_SECMARK
- + nla_total_size(0) /* CTA_SECCTX */
- + nla_total_size(ctnetlink_nlmsg_secctx_size(ct)) /* CTA_SECCTX_NAME */
-#endif
+ + ctnetlink_secctx_size(ct)
#ifdef CONFIG_NF_NAT_NEEDED
+ 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
+ 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
index 0fb65705b44b..b4d7f0f24b27 100644
--- a/net/netfilter/nf_conntrack_standalone.c
+++ b/net/netfilter/nf_conntrack_standalone.c
@@ -118,7 +118,7 @@ static int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
if (ret)
- return ret;
+ return 0;
ret = seq_printf(s, "secctx=%s ", secctx);