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authorThomas Graf <tgraf@suug.ch>2006-07-05 20:45:06 -0700
committerDavid S. Miller <davem@davemloft.net>2006-07-05 20:45:06 -0700
commit26dab8930b408d5e5eb9ef496d68364dc955e249 (patch)
tree3ddcc939b167a66638b91fa423882048faf6b8ca
parente340221acda6bc0bf05a0ff6e6114902c4307670 (diff)
[PKT_SCHED]: Fix illegal memory dereferences when dumping actions
The TCA_ACT_KIND attribute is used without checking its availability when dumping actions therefore leading to a value of 0x4 being dereferenced. The use of strcmp() in tc_lookup_action_n() isn't safe when fed with string from an attribute without enforcing proper NUL termination. Both bugs can be triggered with malformed netlink message and don't require any privileges. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/sched/act_api.c11
1 files changed, 5 insertions, 6 deletions
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 5b9397b33238..f9d1d78e17f8 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -776,7 +776,7 @@ replay:
return ret;
}
-static char *
+static struct rtattr *
find_dump_kind(struct nlmsghdr *n)
{
struct rtattr *tb1, *tb2[TCA_ACT_MAX+1];
@@ -804,7 +804,7 @@ find_dump_kind(struct nlmsghdr *n)
return NULL;
kind = tb2[TCA_ACT_KIND-1];
- return (char *) RTA_DATA(kind);
+ return kind;
}
static int
@@ -817,16 +817,15 @@ tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
struct tc_action a;
int ret = 0;
struct tcamsg *t = (struct tcamsg *) NLMSG_DATA(cb->nlh);
- char *kind = find_dump_kind(cb->nlh);
+ struct rtattr *kind = find_dump_kind(cb->nlh);
if (kind == NULL) {
printk("tc_dump_action: action bad kind\n");
return 0;
}
- a_o = tc_lookup_action_n(kind);
+ a_o = tc_lookup_action(kind);
if (a_o == NULL) {
- printk("failed to find %s\n", kind);
return 0;
}
@@ -834,7 +833,7 @@ tc_dump_action(struct sk_buff *skb, struct netlink_callback *cb)
a.ops = a_o;
if (a_o->walk == NULL) {
- printk("tc_dump_action: %s !capable of dumping table\n", kind);
+ printk("tc_dump_action: %s !capable of dumping table\n", a_o->kind);
goto rtattr_failure;
}

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