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[IPSEC]: Lock state when copying non-atomic fields to user-space

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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>
This commit is contained in:
Herbert Xu 2007-10-09 13:31:47 -07:00 committed by David S. Miller
parent 68325d3b12
commit 050f009e16
2 changed files with 33 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
net/key/af_key.c
View File

@ -655,7 +655,8 @@ static inline int pfkey_mode_to_xfrm(int mode)
} }
} }
static struct sk_buff * pfkey_xfrm_state2msg(struct xfrm_state *x, int add_keys, int hsc) static struct sk_buff *__pfkey_xfrm_state2msg(struct xfrm_state *x,
int add_keys, int hsc)
{ {
struct sk_buff *skb; struct sk_buff *skb;
struct sadb_msg *hdr; struct sadb_msg *hdr;
@ -1009,6 +1010,24 @@ static struct sk_buff * pfkey_xfrm_state2msg(struct xfrm_state *x, int add_keys,
return skb; return skb;
} }
static inline struct sk_buff *pfkey_xfrm_state2msg(struct xfrm_state *x)
{
struct sk_buff *skb;
spin_lock_bh(&x->lock);
skb = __pfkey_xfrm_state2msg(x, 1, 3);
spin_unlock_bh(&x->lock);
return skb;
}
static inline struct sk_buff *pfkey_xfrm_state2msg_expire(struct xfrm_state *x,
int hsc)
{
return __pfkey_xfrm_state2msg(x, 0, hsc);
}
static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr, static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr,
void **ext_hdrs) void **ext_hdrs)
{ {
@ -1322,7 +1341,7 @@ static int pfkey_getspi(struct sock *sk, struct sk_buff *skb, struct sadb_msg *h
} }
err = xfrm_alloc_spi(x, min_spi, max_spi); err = xfrm_alloc_spi(x, min_spi, max_spi);
resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x, 0, 3); resp_skb = err ? ERR_PTR(err) : pfkey_xfrm_state2msg(x);
if (IS_ERR(resp_skb)) { if (IS_ERR(resp_skb)) {
xfrm_state_put(x); xfrm_state_put(x);
@ -1412,12 +1431,8 @@ static int key_notify_sa(struct xfrm_state *x, struct km_event *c)
{ {
struct sk_buff *skb; struct sk_buff *skb;
struct sadb_msg *hdr; struct sadb_msg *hdr;
int hsc = 3;
if (c->event == XFRM_MSG_DELSA) skb = pfkey_xfrm_state2msg(x);
hsc = 0;
skb = pfkey_xfrm_state2msg(x, 0, hsc);
if (IS_ERR(skb)) if (IS_ERR(skb))
return PTR_ERR(skb); return PTR_ERR(skb);
@ -1529,7 +1544,7 @@ static int pfkey_get(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr,
if (x == NULL) if (x == NULL)
return -ESRCH; return -ESRCH;
out_skb = pfkey_xfrm_state2msg(x, 1, 3); out_skb = pfkey_xfrm_state2msg(x);
proto = x->id.proto; proto = x->id.proto;
xfrm_state_put(x); xfrm_state_put(x);
if (IS_ERR(out_skb)) if (IS_ERR(out_skb))
@ -1709,7 +1724,7 @@ static int dump_sa(struct xfrm_state *x, int count, void *ptr)
struct sk_buff *out_skb; struct sk_buff *out_skb;
struct sadb_msg *out_hdr; struct sadb_msg *out_hdr;
out_skb = pfkey_xfrm_state2msg(x, 1, 3); out_skb = pfkey_xfrm_state2msg(x);
if (IS_ERR(out_skb)) if (IS_ERR(out_skb))
return PTR_ERR(out_skb); return PTR_ERR(out_skb);
@ -2910,7 +2925,7 @@ static int key_notify_sa_expire(struct xfrm_state *x, struct km_event *c)
else else
hsc = 1; hsc = 1;
out_skb = pfkey_xfrm_state2msg(x, 0, hsc); out_skb = pfkey_xfrm_state2msg_expire(x, hsc);
if (IS_ERR(out_skb)) if (IS_ERR(out_skb))
return PTR_ERR(out_skb); return PTR_ERR(out_skb);

14
net/xfrm/xfrm_user.c
View File

@ -507,8 +507,16 @@ static int copy_to_user_state_extra(struct xfrm_state *x,
struct xfrm_usersa_info *p, struct xfrm_usersa_info *p,
struct sk_buff *skb) struct sk_buff *skb)
{ {
spin_lock_bh(&x->lock);
copy_to_user_state(x, p); 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) if (x->aalg)
NLA_PUT(skb, XFRMA_ALG_AUTH, alg_len(x->aalg), x->aalg); NLA_PUT(skb, XFRMA_ALG_AUTH, alg_len(x->aalg), x->aalg);
if (x->ealg) 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) if (x->security && copy_sec_ctx(x->security, skb) < 0)
goto nla_put_failure; 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; return 0;
nla_put_failure: nla_put_failure: