netfilter: helper: add build-time asserts for helper data size
add a 32 byte scratch area in the helper struct instead of relying
on variable sized helpers plus compile-time asserts to let us know
if 32 bytes aren't enough anymore.
Not having variable sized helpers will later allow to add BUILD_BUG_ON
for the total size of conntrack extensions -- the helper extension is
the only one that doesn't have a fixed size.
The (useless!) NF_CT_HELPER_BUILD_BUG_ON(0); are added so that in case
someone adds a new helper and copy-pastes from one that doesn't store
private data at least some indication that this macro should be used
somehow is there...
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
diff --git a/include/net/netfilter/nf_conntrack_helper.h b/include/net/netfilter/nf_conntrack_helper.h
index 15d7465..29539ed 100644
--- a/include/net/netfilter/nf_conntrack_helper.h
+++ b/include/net/netfilter/nf_conntrack_helper.h
@@ -66,9 +66,12 @@ struct nf_conn_help {
u8 expecting[NF_CT_MAX_EXPECT_CLASSES];
/* private helper information. */
- char data[];
+ char data[32] __aligned(8);
};
+#define NF_CT_HELPER_BUILD_BUG_ON(structsize) \
+ BUILD_BUG_ON((structsize) > FIELD_SIZEOF(struct nf_conn_help, data))
+
struct nf_conntrack_helper *__nf_conntrack_helper_find(const char *name,
u16 l3num, u8 protonum);
diff --git a/net/netfilter/nf_conntrack_amanda.c b/net/netfilter/nf_conntrack_amanda.c
index 57a26cc..03d2ccf 100644
--- a/net/netfilter/nf_conntrack_amanda.c
+++ b/net/netfilter/nf_conntrack_amanda.c
@@ -207,6 +207,8 @@ static int __init nf_conntrack_amanda_init(void)
{
int ret, i;
+ NF_CT_HELPER_BUILD_BUG_ON(0);
+
for (i = 0; i < ARRAY_SIZE(search); i++) {
search[i].ts = textsearch_prepare(ts_algo, search[i].string,
search[i].len,
diff --git a/net/netfilter/nf_conntrack_ftp.c b/net/netfilter/nf_conntrack_ftp.c
index 4aecef4..58e1256 100644
--- a/net/netfilter/nf_conntrack_ftp.c
+++ b/net/netfilter/nf_conntrack_ftp.c
@@ -577,6 +577,8 @@ static int __init nf_conntrack_ftp_init(void)
{
int i, ret = 0;
+ NF_CT_HELPER_BUILD_BUG_ON(sizeof(struct nf_ct_ftp_master));
+
ftp_buffer = kmalloc(65536, GFP_KERNEL);
if (!ftp_buffer)
return -ENOMEM;
diff --git a/net/netfilter/nf_conntrack_h323_main.c b/net/netfilter/nf_conntrack_h323_main.c
index f65d9363..e982043 100644
--- a/net/netfilter/nf_conntrack_h323_main.c
+++ b/net/netfilter/nf_conntrack_h323_main.c
@@ -1836,6 +1836,8 @@ static int __init nf_conntrack_h323_init(void)
{
int ret;
+ NF_CT_HELPER_BUILD_BUG_ON(sizeof(struct nf_ct_h323_master));
+
h323_buffer = kmalloc(65536, GFP_KERNEL);
if (!h323_buffer)
return -ENOMEM;
diff --git a/net/netfilter/nf_conntrack_netbios_ns.c b/net/netfilter/nf_conntrack_netbios_ns.c
index 4c8f30a..496ce17 100644
--- a/net/netfilter/nf_conntrack_netbios_ns.c
+++ b/net/netfilter/nf_conntrack_netbios_ns.c
@@ -58,6 +58,8 @@ static struct nf_conntrack_helper helper __read_mostly = {
static int __init nf_conntrack_netbios_ns_init(void)
{
+ NF_CT_HELPER_BUILD_BUG_ON(0);
+
exp_policy.timeout = timeout;
return nf_conntrack_helper_register(&helper);
}
diff --git a/net/netfilter/nf_conntrack_pptp.c b/net/netfilter/nf_conntrack_pptp.c
index f60a475..34fac4c 100644
--- a/net/netfilter/nf_conntrack_pptp.c
+++ b/net/netfilter/nf_conntrack_pptp.c
@@ -607,6 +607,8 @@ static struct nf_conntrack_helper pptp __read_mostly = {
static int __init nf_conntrack_pptp_init(void)
{
+ NF_CT_HELPER_BUILD_BUG_ON(sizeof(struct nf_ct_pptp_master));
+
return nf_conntrack_helper_register(&pptp);
}
diff --git a/net/netfilter/nf_conntrack_sane.c b/net/netfilter/nf_conntrack_sane.c
index 9dcb9ee..1121db0 100644
--- a/net/netfilter/nf_conntrack_sane.c
+++ b/net/netfilter/nf_conntrack_sane.c
@@ -184,6 +184,8 @@ static int __init nf_conntrack_sane_init(void)
{
int i, ret = 0;
+ NF_CT_HELPER_BUILD_BUG_ON(sizeof(struct nf_ct_sane_master));
+
sane_buffer = kmalloc(65536, GFP_KERNEL);
if (!sane_buffer)
return -ENOMEM;
diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c
index 91a9c97..79bbcc4 100644
--- a/net/netfilter/nf_conntrack_sip.c
+++ b/net/netfilter/nf_conntrack_sip.c
@@ -1622,6 +1622,8 @@ static int __init nf_conntrack_sip_init(void)
{
int i, ret;
+ NF_CT_HELPER_BUILD_BUG_ON(sizeof(struct nf_ct_sip_master));
+
if (ports_c == 0)
ports[ports_c++] = SIP_PORT;
diff --git a/net/netfilter/nf_conntrack_tftp.c b/net/netfilter/nf_conntrack_tftp.c
index b1227dc..27e2f6f 100644
--- a/net/netfilter/nf_conntrack_tftp.c
+++ b/net/netfilter/nf_conntrack_tftp.c
@@ -113,6 +113,8 @@ static int __init nf_conntrack_tftp_init(void)
{
int i, ret;
+ NF_CT_HELPER_BUILD_BUG_ON(0);
+
if (ports_c == 0)
ports[ports_c++] = TFTP_PORT;