Li RongQing
2019-Feb-22 13:45 UTC
[Bridge] [PATCH][nf-next][v2] netfilter: convert the proto argument from u8 to u16
The proto in struct xt_match and struct xt_target is u16, when
calling xt_check_target/match, their proto argument is u8,
and will cause truncation, it is harmless to ip packet, since
ip proto is u8
if a etable's match/target has proto that is u16, will cause
the check failure.
and convert be16 to short in bridge/netfilter/ebtables.c
Signed-off-by: Zhang Yu <zhangyu31 at baidu.com>
Signed-off-by: Li RongQing <lirongqing at baidu.com>
---
v2: change type from u_int16_t to u16
include/linux/netfilter/x_tables.h | 4 ++--
net/bridge/netfilter/ebtables.c | 6 +++---
net/netfilter/x_tables.c | 4 ++--
3 files changed, 7 insertions(+), 7 deletions(-)
diff --git a/include/linux/netfilter/x_tables.h
b/include/linux/netfilter/x_tables.h
index 9077b3ebea08..8ba6a6227542 100644
--- a/include/linux/netfilter/x_tables.h
+++ b/include/linux/netfilter/x_tables.h
@@ -289,9 +289,9 @@ bool xt_find_jump_offset(const unsigned int *offsets,
int xt_check_proc_name(const char *name, unsigned int size);
-int xt_check_match(struct xt_mtchk_param *, unsigned int size, u_int8_t proto,
+int xt_check_match(struct xt_mtchk_param *, unsigned int size, u16 proto,
bool inv_proto);
-int xt_check_target(struct xt_tgchk_param *, unsigned int size, u_int8_t proto,
+int xt_check_target(struct xt_tgchk_param *, unsigned int size, u16 proto,
bool inv_proto);
int xt_match_to_user(const struct xt_entry_match *m,
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 6693e209efe8..7bbb9b189752 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -385,7 +385,7 @@ ebt_check_match(struct ebt_entry_match *m, struct
xt_mtchk_param *par,
par->match = match;
par->matchinfo = m->data;
ret = xt_check_match(par, m->match_size,
- e->ethproto, e->invflags & EBT_IPROTO);
+ ntohs(e->ethproto), e->invflags & EBT_IPROTO);
if (ret < 0) {
module_put(match->me);
return ret;
@@ -422,7 +422,7 @@ ebt_check_watcher(struct ebt_entry_watcher *w, struct
xt_tgchk_param *par,
par->target = watcher;
par->targinfo = w->data;
ret = xt_check_target(par, w->watcher_size,
- e->ethproto, e->invflags & EBT_IPROTO);
+ ntohs(e->ethproto), e->invflags & EBT_IPROTO);
if (ret < 0) {
module_put(watcher->me);
return ret;
@@ -767,7 +767,7 @@ ebt_check_entry(struct ebt_entry *e, struct net *net,
tgpar.target = target;
tgpar.targinfo = t->data;
ret = xt_check_target(&tgpar, t->target_size,
- e->ethproto, e->invflags & EBT_IPROTO);
+ ntohs(e->ethproto), e->invflags & EBT_IPROTO);
if (ret < 0) {
module_put(target->me);
goto cleanup_watchers;
diff --git a/net/netfilter/x_tables.c b/net/netfilter/x_tables.c
index 13e1ac333fa4..5b61146443ad 100644
--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -461,7 +461,7 @@ int xt_check_proc_name(const char *name, unsigned int size)
EXPORT_SYMBOL(xt_check_proc_name);
int xt_check_match(struct xt_mtchk_param *par,
- unsigned int size, u_int8_t proto, bool inv_proto)
+ unsigned int size, u16 proto, bool inv_proto)
{
int ret;
@@ -984,7 +984,7 @@ bool xt_find_jump_offset(const unsigned int *offsets,
EXPORT_SYMBOL(xt_find_jump_offset);
int xt_check_target(struct xt_tgchk_param *par,
- unsigned int size, u_int8_t proto, bool inv_proto)
+ unsigned int size, u16 proto, bool inv_proto)
{
int ret;
--
2.16.2
Pablo Neira Ayuso
2019-Mar-01 13:32 UTC
[Bridge] [PATCH][nf-next][v2] netfilter: convert the proto argument from u8 to u16
On Fri, Feb 22, 2019 at 09:45:52PM +0800, Li RongQing wrote:> The proto in struct xt_match and struct xt_target is u16, when > calling xt_check_target/match, their proto argument is u8, > and will cause truncation, it is harmless to ip packet, since > ip proto is u8 > > if a etable's match/target has proto that is u16, will cause > the check failure. > > and convert be16 to short in bridge/netfilter/ebtables.cApplied, thanks.