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KEYS: Provide a generic instantiation function

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Provide a generic instantiation function for key types that use the preparse
hook.  This makes it easier to prereserve key quota before keyrings get locked
to retain the new key.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Steve Dickson <steved@redhat.com>
Acked-by: Jeff Layton <jlayton@primarydata.com>
Reviewed-by: Sage Weil <sage@redhat.com>
This commit is contained in:
David Howells
2014-07-18 18:56:34 +01:00
parent 32c2e6752f
commit 6a09d17bb6
3 changed files with 33 additions and 24 deletions
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30
security/keys/key.c
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@@ -1023,6 +1023,36 @@ void key_invalidate(struct key *key)
}
EXPORT_SYMBOL(key_invalidate);
/**
* generic_key_instantiate - Simple instantiation of a key from preparsed data
* @key: The key to be instantiated
* @prep: The preparsed data to load.
*
* Instantiate a key from preparsed data. We assume we can just copy the data
* in directly and clear the old pointers.
*
* This can be pointed to directly by the key type instantiate op pointer.
*/
int generic_key_instantiate(struct key *key, struct key_preparsed_payload *prep)
{
int ret;
pr_devel("==>%s()\n", __func__);
ret = key_payload_reserve(key, prep->quotalen);
if (ret == 0) {
key->type_data.p[0] = prep->type_data[0];
key->type_data.p[1] = prep->type_data[1];
rcu_assign_keypointer(key, prep->payload);
prep->type_data[0] = NULL;
prep->type_data[1] = NULL;
prep->payload = NULL;
}
pr_devel("<==%s() = %d\n", __func__, ret);
return ret;
}
EXPORT_SYMBOL(generic_key_instantiate);
/**
* register_key_type - Register a type of key.
* @ktype: The new key type.