diff options
| author | Herbert Xu <herbert@gondor.apana.org.au> | 2007-10-09 22:31:47 +0200 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-10-11 01:55:02 +0200 |
| commit | 050f009e16f908932070313c1745d09dc69fd62b (patch) | |
| tree | 2176b8034065bf2e8b401865efcfaab912bb1997 /net/xfrm | |
| parent | [XFRM] user: Move attribute copying code into copy_to_user_state_extra (diff) | |
| download | linux-050f009e16f908932070313c1745d09dc69fd62b.tar.xz linux-050f009e16f908932070313c1745d09dc69fd62b.zip | |
[IPSEC]: Lock state when copying non-atomic fields to user-space
This patch adds locking so that when we're copying non-atomic fields such as
life-time or coaddr to user-space we don't get a partial result.
For af_key I've changed every instance of pfkey_xfrm_state2msg apart from
expiration notification to include the keys and life-times. This is in-line
with XFRM behaviour.
The actual cases affected are:
* pfkey_getspi: No change as we don't have any keys to copy.
* key_notify_sa:
+ ADD/UPD: This wouldn't work otherwise.
+ DEL: It can't hurt.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/xfrm')
| -rw-r--r-- | net/xfrm/xfrm_user.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c index 2cbbe5e93a7b..5238f6a8dfad 100644 --- a/net/xfrm/xfrm_user.c +++ b/net/xfrm/xfrm_user.c @@ -507,8 +507,16 @@ static int copy_to_user_state_extra(struct xfrm_state *x, struct xfrm_usersa_info *p, struct sk_buff *skb) { + spin_lock_bh(&x->lock); copy_to_user_state(x, p); + if (x->coaddr) + NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); + + if (x->lastused) + NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused); + spin_unlock_bh(&x->lock); + if (x->aalg) NLA_PUT(skb, XFRMA_ALG_AUTH, alg_len(x->aalg), x->aalg); if (x->ealg) @@ -522,12 +530,6 @@ static int copy_to_user_state_extra(struct xfrm_state *x, if (x->security && copy_sec_ctx(x->security, skb) < 0) goto nla_put_failure; - if (x->coaddr) - NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr); - - if (x->lastused) - NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused); - return 0; nla_put_failure: |