* [PATCH net] sctp: add the missing sock_owned_by_user check in sctp_icmp_redirect
@ 2017-10-18 13:37 ` Xin Long
0 siblings, 0 replies; 8+ messages in thread
From: Xin Long @ 2017-10-18 13:37 UTC (permalink / raw)
To: network dev, linux-sctp
Cc: davem, Eric Dumazet, Marcelo Ricardo Leitner, Neil Horman
Now sctp processes icmp redirect packet in sctp_icmp_redirect where
it calls sctp_transport_dst_check in which tp->dst can be released.
The problem is before calling sctp_transport_dst_check, it doesn't
check sock_owned_by_user, which means tp->dst could be freed while
a process is accessing it with owning the socket.
An use-after-free issue could be triggered by this.
This patch is to fix it by checking sock_owned_by_user before calling
sctp_transport_dst_check in sctp_icmp_redirect, so that it would not
release tp->dst if users still hold sock lock.
Besides, the same issue fixed in commit 45caeaa5ac0b ("dccp/tcp: fix
routing redirect race") on sctp also needs this check.
Fixes: 55be7a9c6074 ("ipv4: Add redirect support to all protocol icmp error handlers")
Reported-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
net/sctp/input.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/sctp/input.c b/net/sctp/input.c
index 92a0714..34f10e7 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -421,7 +421,7 @@ void sctp_icmp_redirect(struct sock *sk, struct sctp_transport *t,
{
struct dst_entry *dst;
- if (!t)
+ if (sock_owned_by_user(sk) || !t)
return;
dst = sctp_transport_dst_check(t);
if (dst)
--
2.1.0
^ permalink raw reply related [flat|nested] 8+ messages in thread
* [PATCH net] sctp: add the missing sock_owned_by_user check in sctp_icmp_redirect
@ 2017-10-18 13:37 ` Xin Long
0 siblings, 0 replies; 8+ messages in thread
From: Xin Long @ 2017-10-18 13:37 UTC (permalink / raw)
To: network dev, linux-sctp
Cc: davem, Eric Dumazet, Marcelo Ricardo Leitner, Neil Horman
Now sctp processes icmp redirect packet in sctp_icmp_redirect where
it calls sctp_transport_dst_check in which tp->dst can be released.
The problem is before calling sctp_transport_dst_check, it doesn't
check sock_owned_by_user, which means tp->dst could be freed while
a process is accessing it with owning the socket.
An use-after-free issue could be triggered by this.
This patch is to fix it by checking sock_owned_by_user before calling
sctp_transport_dst_check in sctp_icmp_redirect, so that it would not
release tp->dst if users still hold sock lock.
Besides, the same issue fixed in commit 45caeaa5ac0b ("dccp/tcp: fix
routing redirect race") on sctp also needs this check.
Fixes: 55be7a9c6074 ("ipv4: Add redirect support to all protocol icmp error handlers")
Reported-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
net/sctp/input.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/sctp/input.c b/net/sctp/input.c
index 92a0714..34f10e7 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -421,7 +421,7 @@ void sctp_icmp_redirect(struct sock *sk, struct sctp_transport *t,
{
struct dst_entry *dst;
- if (!t)
+ if (sock_owned_by_user(sk) || !t)
return;
dst = sctp_transport_dst_check(t);
if (dst)
--
2.1.0
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH net] sctp: add the missing sock_owned_by_user check in sctp_icmp_redirect
2017-10-18 13:37 ` Xin Long
@ 2017-10-18 13:56 ` Marcelo Ricardo Leitner
-1 siblings, 0 replies; 8+ messages in thread
From: Marcelo Ricardo Leitner @ 2017-10-18 13:56 UTC (permalink / raw)
To: Xin Long; +Cc: network dev, linux-sctp, davem, Eric Dumazet, Neil Horman
On Wed, Oct 18, 2017 at 09:37:49PM +0800, Xin Long wrote:
> Now sctp processes icmp redirect packet in sctp_icmp_redirect where
> it calls sctp_transport_dst_check in which tp->dst can be released.
>
> The problem is before calling sctp_transport_dst_check, it doesn't
> check sock_owned_by_user, which means tp->dst could be freed while
> a process is accessing it with owning the socket.
>
> An use-after-free issue could be triggered by this.
>
> This patch is to fix it by checking sock_owned_by_user before calling
> sctp_transport_dst_check in sctp_icmp_redirect, so that it would not
> release tp->dst if users still hold sock lock.
>
> Besides, the same issue fixed in commit 45caeaa5ac0b ("dccp/tcp: fix
> routing redirect race") on sctp also needs this check.
>
> Fixes: 55be7a9c6074 ("ipv4: Add redirect support to all protocol icmp error handlers")
> Reported-by: Eric Dumazet <edumazet@google.com>
Nice catch, btw.
> Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Thanks
> ---
> net/sctp/input.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/sctp/input.c b/net/sctp/input.c
> index 92a0714..34f10e7 100644
> --- a/net/sctp/input.c
> +++ b/net/sctp/input.c
> @@ -421,7 +421,7 @@ void sctp_icmp_redirect(struct sock *sk, struct sctp_transport *t,
> {
> struct dst_entry *dst;
>
> - if (!t)
> + if (sock_owned_by_user(sk) || !t)
> return;
> dst = sctp_transport_dst_check(t);
> if (dst)
> --
> 2.1.0
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-sctp" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH net] sctp: add the missing sock_owned_by_user check in sctp_icmp_redirect
@ 2017-10-18 13:56 ` Marcelo Ricardo Leitner
0 siblings, 0 replies; 8+ messages in thread
From: Marcelo Ricardo Leitner @ 2017-10-18 13:56 UTC (permalink / raw)
To: Xin Long; +Cc: network dev, linux-sctp, davem, Eric Dumazet, Neil Horman
On Wed, Oct 18, 2017 at 09:37:49PM +0800, Xin Long wrote:
> Now sctp processes icmp redirect packet in sctp_icmp_redirect where
> it calls sctp_transport_dst_check in which tp->dst can be released.
>
> The problem is before calling sctp_transport_dst_check, it doesn't
> check sock_owned_by_user, which means tp->dst could be freed while
> a process is accessing it with owning the socket.
>
> An use-after-free issue could be triggered by this.
>
> This patch is to fix it by checking sock_owned_by_user before calling
> sctp_transport_dst_check in sctp_icmp_redirect, so that it would not
> release tp->dst if users still hold sock lock.
>
> Besides, the same issue fixed in commit 45caeaa5ac0b ("dccp/tcp: fix
> routing redirect race") on sctp also needs this check.
>
> Fixes: 55be7a9c6074 ("ipv4: Add redirect support to all protocol icmp error handlers")
> Reported-by: Eric Dumazet <edumazet@google.com>
Nice catch, btw.
> Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Thanks
> ---
> net/sctp/input.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/sctp/input.c b/net/sctp/input.c
> index 92a0714..34f10e7 100644
> --- a/net/sctp/input.c
> +++ b/net/sctp/input.c
> @@ -421,7 +421,7 @@ void sctp_icmp_redirect(struct sock *sk, struct sctp_transport *t,
> {
> struct dst_entry *dst;
>
> - if (!t)
> + if (sock_owned_by_user(sk) || !t)
> return;
> dst = sctp_transport_dst_check(t);
> if (dst)
> --
> 2.1.0
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-sctp" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH net] sctp: add the missing sock_owned_by_user check in sctp_icmp_redirect
2017-10-18 13:37 ` Xin Long
@ 2017-10-18 14:27 ` Neil Horman
-1 siblings, 0 replies; 8+ messages in thread
From: Neil Horman @ 2017-10-18 14:27 UTC (permalink / raw)
To: Xin Long
Cc: network dev, linux-sctp, davem, Eric Dumazet, Marcelo Ricardo Leitner
On Wed, Oct 18, 2017 at 09:37:49PM +0800, Xin Long wrote:
> Now sctp processes icmp redirect packet in sctp_icmp_redirect where
> it calls sctp_transport_dst_check in which tp->dst can be released.
>
> The problem is before calling sctp_transport_dst_check, it doesn't
> check sock_owned_by_user, which means tp->dst could be freed while
> a process is accessing it with owning the socket.
>
> An use-after-free issue could be triggered by this.
>
> This patch is to fix it by checking sock_owned_by_user before calling
> sctp_transport_dst_check in sctp_icmp_redirect, so that it would not
> release tp->dst if users still hold sock lock.
>
> Besides, the same issue fixed in commit 45caeaa5ac0b ("dccp/tcp: fix
> routing redirect race") on sctp also needs this check.
>
> Fixes: 55be7a9c6074 ("ipv4: Add redirect support to all protocol icmp error handlers")
> Reported-by: Eric Dumazet <edumazet@google.com>
> Signed-off-by: Xin Long <lucien.xin@gmail.com>
> ---
> net/sctp/input.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/sctp/input.c b/net/sctp/input.c
> index 92a0714..34f10e7 100644
> --- a/net/sctp/input.c
> +++ b/net/sctp/input.c
> @@ -421,7 +421,7 @@ void sctp_icmp_redirect(struct sock *sk, struct sctp_transport *t,
> {
> struct dst_entry *dst;
>
> - if (!t)
> + if (sock_owned_by_user(sk) || !t)
> return;
> dst = sctp_transport_dst_check(t);
> if (dst)
> --
> 2.1.0
>
>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH net] sctp: add the missing sock_owned_by_user check in sctp_icmp_redirect
@ 2017-10-18 14:27 ` Neil Horman
0 siblings, 0 replies; 8+ messages in thread
From: Neil Horman @ 2017-10-18 14:27 UTC (permalink / raw)
To: Xin Long
Cc: network dev, linux-sctp, davem, Eric Dumazet, Marcelo Ricardo Leitner
On Wed, Oct 18, 2017 at 09:37:49PM +0800, Xin Long wrote:
> Now sctp processes icmp redirect packet in sctp_icmp_redirect where
> it calls sctp_transport_dst_check in which tp->dst can be released.
>
> The problem is before calling sctp_transport_dst_check, it doesn't
> check sock_owned_by_user, which means tp->dst could be freed while
> a process is accessing it with owning the socket.
>
> An use-after-free issue could be triggered by this.
>
> This patch is to fix it by checking sock_owned_by_user before calling
> sctp_transport_dst_check in sctp_icmp_redirect, so that it would not
> release tp->dst if users still hold sock lock.
>
> Besides, the same issue fixed in commit 45caeaa5ac0b ("dccp/tcp: fix
> routing redirect race") on sctp also needs this check.
>
> Fixes: 55be7a9c6074 ("ipv4: Add redirect support to all protocol icmp error handlers")
> Reported-by: Eric Dumazet <edumazet@google.com>
> Signed-off-by: Xin Long <lucien.xin@gmail.com>
> ---
> net/sctp/input.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/sctp/input.c b/net/sctp/input.c
> index 92a0714..34f10e7 100644
> --- a/net/sctp/input.c
> +++ b/net/sctp/input.c
> @@ -421,7 +421,7 @@ void sctp_icmp_redirect(struct sock *sk, struct sctp_transport *t,
> {
> struct dst_entry *dst;
>
> - if (!t)
> + if (sock_owned_by_user(sk) || !t)
> return;
> dst = sctp_transport_dst_check(t);
> if (dst)
> --
> 2.1.0
>
>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH net] sctp: add the missing sock_owned_by_user check in sctp_icmp_redirect
2017-10-18 13:37 ` Xin Long
@ 2017-10-20 11:54 ` David Miller
-1 siblings, 0 replies; 8+ messages in thread
From: David Miller @ 2017-10-20 11:54 UTC (permalink / raw)
To: lucien.xin; +Cc: netdev, linux-sctp, edumazet, marcelo.leitner, nhorman
From: Xin Long <lucien.xin@gmail.com>
Date: Wed, 18 Oct 2017 21:37:49 +0800
> Now sctp processes icmp redirect packet in sctp_icmp_redirect where
> it calls sctp_transport_dst_check in which tp->dst can be released.
>
> The problem is before calling sctp_transport_dst_check, it doesn't
> check sock_owned_by_user, which means tp->dst could be freed while
> a process is accessing it with owning the socket.
>
> An use-after-free issue could be triggered by this.
>
> This patch is to fix it by checking sock_owned_by_user before calling
> sctp_transport_dst_check in sctp_icmp_redirect, so that it would not
> release tp->dst if users still hold sock lock.
>
> Besides, the same issue fixed in commit 45caeaa5ac0b ("dccp/tcp: fix
> routing redirect race") on sctp also needs this check.
>
> Fixes: 55be7a9c6074 ("ipv4: Add redirect support to all protocol icmp error handlers")
> Reported-by: Eric Dumazet <edumazet@google.com>
> Signed-off-by: Xin Long <lucien.xin@gmail.com>
Applied and queued up for -stable.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH net] sctp: add the missing sock_owned_by_user check in sctp_icmp_redirect
@ 2017-10-20 11:54 ` David Miller
0 siblings, 0 replies; 8+ messages in thread
From: David Miller @ 2017-10-20 11:54 UTC (permalink / raw)
To: lucien.xin; +Cc: netdev, linux-sctp, edumazet, marcelo.leitner, nhorman
From: Xin Long <lucien.xin@gmail.com>
Date: Wed, 18 Oct 2017 21:37:49 +0800
> Now sctp processes icmp redirect packet in sctp_icmp_redirect where
> it calls sctp_transport_dst_check in which tp->dst can be released.
>
> The problem is before calling sctp_transport_dst_check, it doesn't
> check sock_owned_by_user, which means tp->dst could be freed while
> a process is accessing it with owning the socket.
>
> An use-after-free issue could be triggered by this.
>
> This patch is to fix it by checking sock_owned_by_user before calling
> sctp_transport_dst_check in sctp_icmp_redirect, so that it would not
> release tp->dst if users still hold sock lock.
>
> Besides, the same issue fixed in commit 45caeaa5ac0b ("dccp/tcp: fix
> routing redirect race") on sctp also needs this check.
>
> Fixes: 55be7a9c6074 ("ipv4: Add redirect support to all protocol icmp error handlers")
> Reported-by: Eric Dumazet <edumazet@google.com>
> Signed-off-by: Xin Long <lucien.xin@gmail.com>
Applied and queued up for -stable.
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2017-10-20 11:54 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-10-18 13:37 [PATCH net] sctp: add the missing sock_owned_by_user check in sctp_icmp_redirect Xin Long
2017-10-18 13:37 ` Xin Long
2017-10-18 13:56 ` Marcelo Ricardo Leitner
2017-10-18 13:56 ` Marcelo Ricardo Leitner
2017-10-18 14:27 ` Neil Horman
2017-10-18 14:27 ` Neil Horman
2017-10-20 11:54 ` David Miller
2017-10-20 11:54 ` David Miller
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.