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authorAl Viro <viro@zeniv.linux.org.uk>2006-12-04 13:13:23 +0100
committerAdrian Bunk <bunk@stusta.de>2006-12-04 13:13:23 +0100
commitdbb4a0ecfe7dc4c989985a23288c98b2e3c8ee0d (patch)
treedc0d05635e7352f3c66c845434f513c857f572fa /net
parente4a7da4a76137dab99b98ce126ec2837dd53f638 (diff)
[EBTABLES]: Prevent wraparounds in checks for entry components' sizes.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Adrian Bunk <bunk@stusta.de>
Diffstat (limited to 'net')
-rw-r--r--net/bridge/netfilter/ebtables.c17
1 files changed, 9 insertions, 8 deletions
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 12a57ae1cead..8171fea28487 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -359,10 +359,11 @@ ebt_check_match(struct ebt_entry_match *m, struct ebt_entry *e,
const char *name, unsigned int hookmask, unsigned int *cnt)
{
struct ebt_match *match;
+ size_t left = ((char *)e + e->watchers_offset) - (char *)m;
int ret;
- if (((char *)m) + m->match_size + sizeof(struct ebt_entry_match) >
- ((char *)e) + e->watchers_offset)
+ if (left < sizeof(struct ebt_entry_match) ||
+ left - sizeof(struct ebt_entry_match) < m->match_size)
return -EINVAL;
match = find_match_lock(m->u.name, &ret, &ebt_mutex);
if (!match)
@@ -388,10 +389,11 @@ ebt_check_watcher(struct ebt_entry_watcher *w, struct ebt_entry *e,
const char *name, unsigned int hookmask, unsigned int *cnt)
{
struct ebt_watcher *watcher;
+ size_t left = ((char *)e + e->target_offset) - (char *)w;
int ret;
- if (((char *)w) + w->watcher_size + sizeof(struct ebt_entry_watcher) >
- ((char *)e) + e->target_offset)
+ if (left < sizeof(struct ebt_entry_watcher) ||
+ left - sizeof(struct ebt_entry_watcher) < w->watcher_size)
return -EINVAL;
watcher = find_watcher_lock(w->u.name, &ret, &ebt_mutex);
if (!watcher)
@@ -594,6 +596,7 @@ ebt_check_entry(struct ebt_entry *e, struct ebt_table_info *newinfo,
struct ebt_entry_target *t;
struct ebt_target *target;
unsigned int i, j, hook = 0, hookmask = 0;
+ size_t gap = e->next_offset - e->target_offset;
int ret;
/* don't mess with the struct ebt_entries */
@@ -655,8 +658,7 @@ ebt_check_entry(struct ebt_entry *e, struct ebt_table_info *newinfo,
t->u.target = target;
if (t->u.target == &ebt_standard_target) {
- if (e->target_offset + sizeof(struct ebt_standard_target) >
- e->next_offset) {
+ if (gap < sizeof(struct ebt_standard_target)) {
BUGPRINT("Standard target size too big\n");
ret = -EFAULT;
goto cleanup_watchers;
@@ -667,8 +669,7 @@ ebt_check_entry(struct ebt_entry *e, struct ebt_table_info *newinfo,
ret = -EFAULT;
goto cleanup_watchers;
}
- } else if ((e->target_offset + t->target_size +
- sizeof(struct ebt_entry_target) > e->next_offset) ||
+ } else if (t->target_size > gap - sizeof(struct ebt_entry_target) ||
(t->u.target->check &&
t->u.target->check(name, hookmask, e, t->data, t->target_size) != 0)){
module_put(t->u.target->me);