2021-11-17 18:16:43

by Jordy Zomer

Subject: [PATCH] ipv6: check return value of ipv6_skip_exthdr

The offset value is used in pointer math on skb->data.
Since ipv6_skip_exthdr may return -1 the pointer to uh and th
may not point to the actual udp and tcp headers and potentially
overwrite other stuff. This is why I think this should be checked.

Signed-off-by: Jordy Zomer <[email protected]>
---
net/ipv6/esp6.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index ed2f061b8768..dc4251655df9 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -808,6 +808,11 @@ int esp6_input_done2(struct sk_buff *skb, int err)
struct tcphdr *th;

offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
+
+ if (offset < 0)
+ err = -EINVAL;
+ goto out;
+
uh = (void *)(skb->data + offset);
th = (void *)(skb->data + offset);
hdr_len += offset;
--
2.27.0

2021-11-17 18:44:32

by Kees Cook

Subject: Re: [PATCH] ipv6: check return value of ipv6_skip_exthdr

On Wed, Nov 17, 2021 at 07:16:10PM +0100, Jordy Zomer wrote:
> The offset value is used in pointer math on skb->data.
> Since ipv6_skip_exthdr may return -1 the pointer to uh and th
> may not point to the actual udp and tcp headers and potentially
> overwrite other stuff. This is why I think this should be checked.
>
> Signed-off-by: Jordy Zomer <[email protected]>
> ---
> net/ipv6/esp6.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
> index ed2f061b8768..dc4251655df9 100644
> --- a/net/ipv6/esp6.c
> +++ b/net/ipv6/esp6.c
> @@ -808,6 +808,11 @@ int esp6_input_done2(struct sk_buff *skb, int err)
> struct tcphdr *th;
>
> offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
> +
> + if (offset < 0)
> + err = -EINVAL;
> + goto out;
> +

Ew. Yeah, it seems like ipv6_skip_exthdr() needs to be checked in a lot
of places. If this is part of protocol decoding, I'm surprised fuzzers
haven't found this? Is this state reachable?

I assume so, as there have been similar fixes in the past:
https://git.kernel.org/linus/92c6058024e87087cf1b99b0389d67c0a886360e

> uh = (void *)(skb->data + offset);
> th = (void *)(skb->data + offset);
> hdr_len += offset;
> --
> 2.27.0
>

--
Kees Cook

2021-11-17 18:46:39

by Kees Cook

Subject: Re: [PATCH] ipv6: check return value of ipv6_skip_exthdr

On Wed, Nov 17, 2021 at 07:16:10PM +0100, Jordy Zomer wrote:
> The offset value is used in pointer math on skb->data.
> Since ipv6_skip_exthdr may return -1 the pointer to uh and th
> may not point to the actual udp and tcp headers and potentially
> overwrite other stuff. This is why I think this should be checked.
>
> Signed-off-by: Jordy Zomer <[email protected]>
> ---
> net/ipv6/esp6.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
> index ed2f061b8768..dc4251655df9 100644
> --- a/net/ipv6/esp6.c
> +++ b/net/ipv6/esp6.c
> @@ -808,6 +808,11 @@ int esp6_input_done2(struct sk_buff *skb, int err)
> struct tcphdr *th;
>
> offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
> +
> + if (offset < 0)
> + err = -EINVAL;
> + goto out;
> +

Oh, and, this needs { }s. The CI noticed too:
https://patchwork.kernel.org/project/netdevbpf/patch/[email protected]/

> uh = (void *)(skb->data + offset);
> th = (void *)(skb->data + offset);
> hdr_len += offset;
> --
> 2.27.0
>

--
Kees Cook

2021-11-17 19:07:13

by Jordy Zomer

Subject: [PATCH v2] ipv6: check return value of ipv6_skip_exthdr

The offset value is used in pointer math on skb->data.
Since ipv6_skip_exthdr may return -1 the pointer to uh and th
may not point to the actual udp and tcp headers and potentially
overwrite other stuff. This is why I think this should be checked.

EDIT: added {}'s, thanks Kees

Signed-off-by: Jordy Zomer <[email protected]>
---
net/ipv6/esp6.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index ed2f061b8768..f0bac6f7ab6b 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -808,6 +808,12 @@ int esp6_input_done2(struct sk_buff *skb, int err)
struct tcphdr *th;

offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
+
+ if (offset < 0) {
+ err = -EINVAL;
+ goto out;
+ }
+
uh = (void *)(skb->data + offset);
th = (void *)(skb->data + offset);
hdr_len += offset;
--
2.27.0

2021-11-18 11:51:14

by patchwork-bot+netdevbpf

Subject: Re: [PATCH v2] ipv6: check return value of ipv6_skip_exthdr

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <[email protected]>:

On Wed, 17 Nov 2021 20:06:48 +0100 you wrote:
> The offset value is used in pointer math on skb->data.
> Since ipv6_skip_exthdr may return -1 the pointer to uh and th
> may not point to the actual udp and tcp headers and potentially
> overwrite other stuff. This is why I think this should be checked.
>
> EDIT: added {}'s, thanks Kees
>
> [...]

Here is the summary with links:
- [v2] ipv6: check return value of ipv6_skip_exthdr
https://git.kernel.org/netdev/net/c/5f9c55c8066b

You are awesome, thank you!
--
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