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xfrm: Fix unaligned access to stats in copy_to_user_state()

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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>
This commit is contained in:
Sowmini Varadhan 2015-10-21 11:48:25 -04:00 committed by Steffen Klassert
parent c386578f1c
commit e33d4f13d2
1 changed files with 4 additions and 1 deletions
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5
net/xfrm/xfrm_user.c
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@ -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;