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calipso: Add a label cache.

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This works in exactly the same way as the CIPSO label cache.
The idea is to allow the lsm to cache the result of a secattr
lookup so that it doesn't need to perform the lookup for
every skbuff.

It introduces two sysctl controls:
 calipso_cache_enable - enables/disables the cache.
 calipso_cache_bucket_size - sets the size of a cache bucket.

Signed-off-by: Huw Davies <huw@codeweavers.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Huw Davies
2016-06-27 15:06:17 -04:00
committed by Paul Moore
parent 2e532b7028
commit 4fee5242bf
8 changed files with 360 additions and 12 deletions
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9
security/selinux/netlabel.c
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@@ -54,6 +54,7 @@
*
*/
static int selinux_netlbl_sidlookup_cached(struct sk_buff *skb,
u16 family,
struct netlbl_lsm_secattr *secattr,
u32 *sid)
{
@@ -63,7 +64,7 @@ static int selinux_netlbl_sidlookup_cached(struct sk_buff *skb,
if (rc == 0 &&
(secattr->flags & NETLBL_SECATTR_CACHEABLE) &&
(secattr->flags & NETLBL_SECATTR_CACHE))
netlbl_cache_add(skb, secattr);
netlbl_cache_add(skb, family, secattr);
return rc;
}
@@ -214,7 +215,8 @@ int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
netlbl_secattr_init(&secattr);
rc = netlbl_skbuff_getattr(skb, family, &secattr);
if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE)
rc = selinux_netlbl_sidlookup_cached(skb, &secattr, sid);
rc = selinux_netlbl_sidlookup_cached(skb, family,
&secattr, sid);
else
*sid = SECSID_NULL;
*type = secattr.type;
@@ -382,7 +384,8 @@ int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
netlbl_secattr_init(&secattr);
rc = netlbl_skbuff_getattr(skb, family, &secattr);
if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE)
rc = selinux_netlbl_sidlookup_cached(skb, &secattr, &nlbl_sid);
rc = selinux_netlbl_sidlookup_cached(skb, family,
&secattr, &nlbl_sid);
else
nlbl_sid = SECINITSID_UNLABELED;
netlbl_secattr_destroy(&secattr);