* [PATCH net] net: sched: ensure opts_len <= IP_TUNNEL_OPTS_MAX in act_tunnel_key
@ 2019-11-18 9:39 Xin Long
2019-11-18 13:02 ` Simon Horman
2019-11-19 1:18 ` David Miller
0 siblings, 2 replies; 3+ messages in thread
From: Xin Long @ 2019-11-18 9:39 UTC (permalink / raw)
To: network dev; +Cc: davem, Simon Horman, Jakub Kicinski, Pieter Jansen van Vuuren
info->options_len is 'u8' type, and when opts_len with a value >
IP_TUNNEL_OPTS_MAX, 'info->options_len = opts_len' will cast int
to u8 and set a wrong value to info->options_len.
Kernel crashed in my test when doing:
# opts="0102:80:00800022"
# for i in {1..99}; do opts="$opts,0102:80:00800022"; done
# ip link add name geneve0 type geneve dstport 0 external
# tc qdisc add dev eth0 ingress
# tc filter add dev eth0 protocol ip parent ffff: \
flower indev eth0 ip_proto udp action tunnel_key \
set src_ip 10.0.99.192 dst_ip 10.0.99.193 \
dst_port 6081 id 11 geneve_opts $opts \
action mirred egress redirect dev geneve0
So we should do the similar check as cls_flower does, return error
when opts_len > IP_TUNNEL_OPTS_MAX in tunnel_key_copy_opts().
Fixes: 0ed5269f9e41 ("net/sched: add tunnel option support to act_tunnel_key")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
net/sched/act_tunnel_key.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/net/sched/act_tunnel_key.c b/net/sched/act_tunnel_key.c
index 2f83a79..d55669e 100644
--- a/net/sched/act_tunnel_key.c
+++ b/net/sched/act_tunnel_key.c
@@ -135,6 +135,10 @@ static int tunnel_key_copy_opts(const struct nlattr *nla, u8 *dst,
if (opt_len < 0)
return opt_len;
opts_len += opt_len;
+ if (opts_len > IP_TUNNEL_OPTS_MAX) {
+ NL_SET_ERR_MSG(extack, "Tunnel options exceeds max size");
+ return -EINVAL;
+ }
if (dst) {
dst_len -= opt_len;
dst += opt_len;
--
2.1.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH net] net: sched: ensure opts_len <= IP_TUNNEL_OPTS_MAX in act_tunnel_key
2019-11-18 9:39 [PATCH net] net: sched: ensure opts_len <= IP_TUNNEL_OPTS_MAX in act_tunnel_key Xin Long
@ 2019-11-18 13:02 ` Simon Horman
2019-11-19 1:18 ` David Miller
1 sibling, 0 replies; 3+ messages in thread
From: Simon Horman @ 2019-11-18 13:02 UTC (permalink / raw)
To: Xin Long; +Cc: network dev, davem, Jakub Kicinski, Pieter Jansen van Vuuren
On Mon, Nov 18, 2019 at 05:39:34PM +0800, Xin Long wrote:
> info->options_len is 'u8' type, and when opts_len with a value >
> IP_TUNNEL_OPTS_MAX, 'info->options_len = opts_len' will cast int
> to u8 and set a wrong value to info->options_len.
>
> Kernel crashed in my test when doing:
>
> # opts="0102:80:00800022"
> # for i in {1..99}; do opts="$opts,0102:80:00800022"; done
> # ip link add name geneve0 type geneve dstport 0 external
> # tc qdisc add dev eth0 ingress
> # tc filter add dev eth0 protocol ip parent ffff: \
> flower indev eth0 ip_proto udp action tunnel_key \
> set src_ip 10.0.99.192 dst_ip 10.0.99.193 \
> dst_port 6081 id 11 geneve_opts $opts \
> action mirred egress redirect dev geneve0
>
> So we should do the similar check as cls_flower does, return error
> when opts_len > IP_TUNNEL_OPTS_MAX in tunnel_key_copy_opts().
>
> Fixes: 0ed5269f9e41 ("net/sched: add tunnel option support to act_tunnel_key")
> Signed-off-by: Xin Long <lucien.xin@gmail.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH net] net: sched: ensure opts_len <= IP_TUNNEL_OPTS_MAX in act_tunnel_key
2019-11-18 9:39 [PATCH net] net: sched: ensure opts_len <= IP_TUNNEL_OPTS_MAX in act_tunnel_key Xin Long
2019-11-18 13:02 ` Simon Horman
@ 2019-11-19 1:18 ` David Miller
1 sibling, 0 replies; 3+ messages in thread
From: David Miller @ 2019-11-19 1:18 UTC (permalink / raw)
To: lucien.xin; +Cc: netdev, simon.horman, jakub.kicinski, pieter.jansenvanvuuren
From: Xin Long <lucien.xin@gmail.com>
Date: Mon, 18 Nov 2019 17:39:34 +0800
> info->options_len is 'u8' type, and when opts_len with a value >
> IP_TUNNEL_OPTS_MAX, 'info->options_len = opts_len' will cast int
> to u8 and set a wrong value to info->options_len.
>
> Kernel crashed in my test when doing:
>
> # opts="0102:80:00800022"
> # for i in {1..99}; do opts="$opts,0102:80:00800022"; done
> # ip link add name geneve0 type geneve dstport 0 external
> # tc qdisc add dev eth0 ingress
> # tc filter add dev eth0 protocol ip parent ffff: \
> flower indev eth0 ip_proto udp action tunnel_key \
> set src_ip 10.0.99.192 dst_ip 10.0.99.193 \
> dst_port 6081 id 11 geneve_opts $opts \
> action mirred egress redirect dev geneve0
>
> So we should do the similar check as cls_flower does, return error
> when opts_len > IP_TUNNEL_OPTS_MAX in tunnel_key_copy_opts().
>
> Fixes: 0ed5269f9e41 ("net/sched: add tunnel option support to act_tunnel_key")
> Signed-off-by: Xin Long <lucien.xin@gmail.com>
Applied and queued up for -stable.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2019-11-18 9:39 [PATCH net] net: sched: ensure opts_len <= IP_TUNNEL_OPTS_MAX in act_tunnel_key Xin Long
2019-11-18 13:02 ` Simon Horman
2019-11-19 1:18 ` David Miller
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