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selinux: always return a secid from the network caches if we find one

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Previously if we couldn't find an entry in the cache and we failed to
allocate memory for a new cache entry we would fail the network object
label lookup; this is obviously not ideal.  This patch fixes this so
that we return the object label even if we can't cache the object at
this point in time due to memory pressure.

The GitHub issue tracker is below:
 * https://github.com/SELinuxProject/selinux-kernel/issues/3

Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Paul Moore
2019-08-01 17:55:06 -04:00
parent f07ea1d4ed
commit 9b80c36353
3 changed files with 38 additions and 47 deletions
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31
security/selinux/netif.c
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@@ -135,9 +135,9 @@ static void sel_netif_destroy(struct sel_netif *netif)
*/
static int sel_netif_sid_slow(struct net *ns, int ifindex, u32 *sid)
{
int ret;
int ret = 0;
struct sel_netif *netif;
struct sel_netif *new = NULL;
struct sel_netif *new;
struct net_device *dev;
/* NOTE: we always use init's network namespace since we don't
@@ -154,32 +154,27 @@ static int sel_netif_sid_slow(struct net *ns, int ifindex, u32 *sid)
netif = sel_netif_find(ns, ifindex);
if (netif != NULL) {
*sid = netif->nsec.sid;
ret = 0;
goto out;
}
ret = security_netif_sid(&selinux_state, dev->name, sid);
if (ret != 0)
goto out;
new = kzalloc(sizeof(*new), GFP_ATOMIC);
if (new == NULL) {
ret = -ENOMEM;
goto out;
if (new) {
new->nsec.ns = ns;
new->nsec.ifindex = ifindex;
new->nsec.sid = *sid;
if (sel_netif_insert(new))
kfree(new);
}
ret = security_netif_sid(&selinux_state, dev->name, &new->nsec.sid);
if (ret != 0)
goto out;
new->nsec.ns = ns;
new->nsec.ifindex = ifindex;
ret = sel_netif_insert(new);
if (ret != 0)
goto out;
*sid = new->nsec.sid;
out:
spin_unlock_bh(&sel_netif_lock);
dev_put(dev);
if (unlikely(ret)) {
if (unlikely(ret))
pr_warn("SELinux: failure in %s(), unable to determine network interface label (%d)\n",
__func__, ifindex);
kfree(new);
}
return ret;
}