From: Steffen Klassert <steffen.klassert@secunet.com>
To: David Miller <davem@davemloft.net>
Cc: Herbert Xu <herbert@gondor.apana.org.au>,
Steffen Klassert <steffen.klassert@secunet.com>,
<netdev@vger.kernel.org>
Subject: [PATCH 2/5] xfrm: Fix unaligned access to stats in copy_to_user_state()
Date: Fri, 30 Oct 2015 07:16:27 +0100 [thread overview]
Message-ID: <1446185790-24214-3-git-send-email-steffen.klassert@secunet.com> (raw)
In-Reply-To: <1446185790-24214-1-git-send-email-steffen.klassert@secunet.com>
From: Sowmini Varadhan <sowmini.varadhan@oracle.com>
On sparc, deleting established SAs (e.g., by restarting ipsec)
results in unaligned access messages via xfrm_del_sa ->
km_state_notify -> xfrm_send_state_notify().
Even though struct xfrm_usersa_info is aligned on 8-byte boundaries,
netlink attributes are fundamentally only 4 byte aligned, and this
cannot be changed for nla_data() that is passed up to userspace.
As a result, the put_unaligned() macro needs to be used to
set up potentially unaligned fields such as the xfrm_stats in
copy_to_user_state()
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
---
net/xfrm/xfrm_user.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index a8de9e3..639e0d5 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -31,6 +31,7 @@
#if IS_ENABLED(CONFIG_IPV6)
#include <linux/in6.h>
#endif
+#include <asm/unaligned.h>
static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
{
@@ -728,7 +729,9 @@ static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
memcpy(&p->sel, &x->sel, sizeof(p->sel));
memcpy(&p->lft, &x->lft, sizeof(p->lft));
memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
- memcpy(&p->stats, &x->stats, sizeof(p->stats));
+ put_unaligned(x->stats.replay_window, &p->stats.replay_window);
+ put_unaligned(x->stats.replay, &p->stats.replay);
+ put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
p->mode = x->props.mode;
p->replay_window = x->props.replay_window;
--
1.9.1
next prev parent reply other threads:[~2015-10-30 6:16 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-30 6:16 pull request (net-next): ipsec-next 2015-10-30 Steffen Klassert
2015-10-30 6:16 ` [PATCH 1/5] xfrm: Let the flowcache handle its size by default Steffen Klassert
2015-10-30 6:16 ` Steffen Klassert [this message]
2015-10-30 6:16 ` [PATCH 3/5] xfrm4: Fix header checks in _decode_session4 Steffen Klassert
2015-10-30 6:16 ` [PATCH 4/5] xfrm4: Reload skb header pointers after calling pskb_may_pull Steffen Klassert
2015-10-30 6:16 ` [PATCH 5/5] xfrm: Increment statistic counter on inner mode error Steffen Klassert
2015-10-30 11:53 ` pull request (net-next): ipsec-next 2015-10-30 David Miller
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