* [PATCH net] soreuseport: fix NULL ptr dereference SO_REUSEPORT after bind
@ 2016-01-19 19:27 Craig Gallek
2016-01-19 19:43 ` Marc Dionne
2016-01-19 19:44 ` David Miller
0 siblings, 2 replies; 3+ messages in thread
From: Craig Gallek @ 2016-01-19 19:27 UTC (permalink / raw)
To: netdev, David Miller; +Cc: marc.c.dionne
From: Craig Gallek <kraig@google.com>
Marc Dionne discovered a NULL pointer dereference when setting
SO_REUSEPORT on a socket after it is bound.
This patch removes the assumption that at least one socket in the
reuseport group is bound with the SO_REUSEPORT option before other
bind calls occur.
Fixes: e32ea7e74727 ("soreuseport: fast reuseport UDP socket selection")
Reported-by: Marc Dionne <marc.c.dionne@gmail.com>
Signed-off-by: Craig Gallek <kraig@google.com>
---
include/net/sock_reuseport.h | 2 +-
net/core/sock_reuseport.c | 9 ++++++++-
2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/include/net/sock_reuseport.h b/include/net/sock_reuseport.h
index 7dda3d7adba8..aecd30308d50 100644
--- a/include/net/sock_reuseport.h
+++ b/include/net/sock_reuseport.h
@@ -16,7 +16,7 @@ struct sock_reuseport {
};
extern int reuseport_alloc(struct sock *sk);
-extern int reuseport_add_sock(struct sock *sk, const struct sock *sk2);
+extern int reuseport_add_sock(struct sock *sk, struct sock *sk2);
extern void reuseport_detach_sock(struct sock *sk);
extern struct sock *reuseport_select_sock(struct sock *sk,
u32 hash,
diff --git a/net/core/sock_reuseport.c b/net/core/sock_reuseport.c
index 1df98c557440..e92b759d906c 100644
--- a/net/core/sock_reuseport.c
+++ b/net/core/sock_reuseport.c
@@ -93,10 +93,17 @@ static struct sock_reuseport *reuseport_grow(struct sock_reuseport *reuse)
* @sk2: Socket belonging to the existing reuseport group.
* May return ENOMEM and not add socket to group under memory pressure.
*/
-int reuseport_add_sock(struct sock *sk, const struct sock *sk2)
+int reuseport_add_sock(struct sock *sk, struct sock *sk2)
{
struct sock_reuseport *reuse;
+ if (!rcu_access_pointer(sk2->sk_reuseport_cb)) {
+ int err = reuseport_alloc(sk2);
+
+ if (err)
+ return err;
+ }
+
spin_lock_bh(&reuseport_lock);
reuse = rcu_dereference_protected(sk2->sk_reuseport_cb,
lockdep_is_held(&reuseport_lock)),
--
2.6.0.rc2.230.g3dd15c0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH net] soreuseport: fix NULL ptr dereference SO_REUSEPORT after bind
2016-01-19 19:27 [PATCH net] soreuseport: fix NULL ptr dereference SO_REUSEPORT after bind Craig Gallek
@ 2016-01-19 19:43 ` Marc Dionne
2016-01-19 19:44 ` David Miller
1 sibling, 0 replies; 3+ messages in thread
From: Marc Dionne @ 2016-01-19 19:43 UTC (permalink / raw)
To: Craig Gallek; +Cc: netdev, David Miller
On Tue, Jan 19, 2016 at 3:27 PM, Craig Gallek <kraigatgoog@gmail.com> wrote:
> From: Craig Gallek <kraig@google.com>
>
> Marc Dionne discovered a NULL pointer dereference when setting
> SO_REUSEPORT on a socket after it is bound.
> This patch removes the assumption that at least one socket in the
> reuseport group is bound with the SO_REUSEPORT option before other
> bind calls occur.
>
> Fixes: e32ea7e74727 ("soreuseport: fast reuseport UDP socket selection")
> Reported-by: Marc Dionne <marc.c.dionne@gmail.com>
> Signed-off-by: Craig Gallek <kraig@google.com>
> ---
> include/net/sock_reuseport.h | 2 +-
> net/core/sock_reuseport.c | 9 ++++++++-
> 2 files changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/include/net/sock_reuseport.h b/include/net/sock_reuseport.h
> index 7dda3d7adba8..aecd30308d50 100644
> --- a/include/net/sock_reuseport.h
> +++ b/include/net/sock_reuseport.h
> @@ -16,7 +16,7 @@ struct sock_reuseport {
> };
>
> extern int reuseport_alloc(struct sock *sk);
> -extern int reuseport_add_sock(struct sock *sk, const struct sock *sk2);
> +extern int reuseport_add_sock(struct sock *sk, struct sock *sk2);
> extern void reuseport_detach_sock(struct sock *sk);
> extern struct sock *reuseport_select_sock(struct sock *sk,
> u32 hash,
> diff --git a/net/core/sock_reuseport.c b/net/core/sock_reuseport.c
> index 1df98c557440..e92b759d906c 100644
> --- a/net/core/sock_reuseport.c
> +++ b/net/core/sock_reuseport.c
> @@ -93,10 +93,17 @@ static struct sock_reuseport *reuseport_grow(struct sock_reuseport *reuse)
> * @sk2: Socket belonging to the existing reuseport group.
> * May return ENOMEM and not add socket to group under memory pressure.
> */
> -int reuseport_add_sock(struct sock *sk, const struct sock *sk2)
> +int reuseport_add_sock(struct sock *sk, struct sock *sk2)
> {
> struct sock_reuseport *reuse;
>
> + if (!rcu_access_pointer(sk2->sk_reuseport_cb)) {
> + int err = reuseport_alloc(sk2);
> +
> + if (err)
> + return err;
> + }
> +
> spin_lock_bh(&reuseport_lock);
> reuse = rcu_dereference_protected(sk2->sk_reuseport_cb,
> lockdep_is_held(&reuseport_lock)),
> --
> 2.6.0.rc2.230.g3dd15c0
>
Tested-by: Marc Dionne <marc.dionne@auristor.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH net] soreuseport: fix NULL ptr dereference SO_REUSEPORT after bind
2016-01-19 19:27 [PATCH net] soreuseport: fix NULL ptr dereference SO_REUSEPORT after bind Craig Gallek
2016-01-19 19:43 ` Marc Dionne
@ 2016-01-19 19:44 ` David Miller
1 sibling, 0 replies; 3+ messages in thread
From: David Miller @ 2016-01-19 19:44 UTC (permalink / raw)
To: kraigatgoog; +Cc: netdev, marc.c.dionne
From: Craig Gallek <kraigatgoog@gmail.com>
Date: Tue, 19 Jan 2016 14:27:08 -0500
> From: Craig Gallek <kraig@google.com>
>
> Marc Dionne discovered a NULL pointer dereference when setting
> SO_REUSEPORT on a socket after it is bound.
> This patch removes the assumption that at least one socket in the
> reuseport group is bound with the SO_REUSEPORT option before other
> bind calls occur.
>
> Fixes: e32ea7e74727 ("soreuseport: fast reuseport UDP socket selection")
> Reported-by: Marc Dionne <marc.c.dionne@gmail.com>
> Signed-off-by: Craig Gallek <kraig@google.com>
Applied, thanks everyone.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2016-01-19 19:27 [PATCH net] soreuseport: fix NULL ptr dereference SO_REUSEPORT after bind Craig Gallek
2016-01-19 19:43 ` Marc Dionne
2016-01-19 19:44 ` David Miller
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