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KEYS: user: Use key preparsing 

Make use of key preparsing in user-defined and logon keys so that quota size
determination can take place prior to keyring locking when a key is being
added.

Also the idmapper key types need to change to match as they use the
user-defined key type routines.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Steve Dickson <steved@redhat.com>
Acked-by: Jeff Layton <jlayton@primarydata.com>
This commit is contained in:
David Howells 2014-07-18 18:56:35 +01:00
parent 4d8c0250b8
commit f9167789df
3 changed files with 30 additions and 22 deletions
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8
fs/nfs/idmap.c
View File

@ -174,7 +174,9 @@ static int nfs_map_numeric_to_string(__u32 id, char *buf, size_t buflen)
static struct key_type key_type_id_resolver = {
.name = "id_resolver",
.instantiate = user_instantiate,
.preparse = user_preparse,
.free_preparse = user_free_preparse,
.instantiate = generic_key_instantiate,
.match = user_match,
.revoke = user_revoke,
.destroy = user_destroy,
@ -394,7 +396,9 @@ static const struct rpc_pipe_ops idmap_upcall_ops = {
static struct key_type key_type_id_resolver_legacy = {
.name = "id_legacy",
.instantiate = user_instantiate,
.preparse = user_preparse,
.free_preparse = user_free_preparse,
.instantiate = generic_key_instantiate,
.match = user_match,
.revoke = user_revoke,
.destroy = user_destroy,

3
include/keys/user-type.h
View File

@ -37,7 +37,8 @@ extern struct key_type key_type_logon;
struct key_preparsed_payload;
extern int user_instantiate(struct key *key, struct key_preparsed_payload *prep);
extern int user_preparse(struct key_preparsed_payload *prep);
extern void user_free_preparse(struct key_preparsed_payload *prep);
extern int user_update(struct key *key, struct key_preparsed_payload *prep);
extern int user_match(const struct key *key, const void *criterion);
extern void user_revoke(struct key *key);

41
security/keys/user_defined.c
View File

@ -27,7 +27,9 @@ static int logon_vet_description(const char *desc);
struct key_type key_type_user = {
.name = "user",
.def_lookup_type = KEYRING_SEARCH_LOOKUP_DIRECT,
.instantiate = user_instantiate,
.preparse = user_preparse,
.free_preparse = user_free_preparse,
.instantiate = generic_key_instantiate,
.update = user_update,
.match = user_match,
.revoke = user_revoke,
@ -47,7 +49,9 @@ EXPORT_SYMBOL_GPL(key_type_user);
struct key_type key_type_logon = {
.name = "logon",
.def_lookup_type = KEYRING_SEARCH_LOOKUP_DIRECT,
.instantiate = user_instantiate,
.preparse = user_preparse,
.free_preparse = user_free_preparse,
.instantiate = generic_key_instantiate,
.update = user_update,
.match = user_match,
.revoke = user_revoke,
@ -58,38 +62,37 @@ struct key_type key_type_logon = {
EXPORT_SYMBOL_GPL(key_type_logon);
/*
* instantiate a user defined key
* Preparse a user defined key payload
*/
int user_instantiate(struct key *key, struct key_preparsed_payload *prep)
int user_preparse(struct key_preparsed_payload *prep)
{
struct user_key_payload *upayload;
size_t datalen = prep->datalen;
int ret;
ret = -EINVAL;
if (datalen <= 0 || datalen > 32767 || !prep->data)
goto error;
return -EINVAL;
ret = key_payload_reserve(key, datalen);
if (ret < 0)
goto error;
ret = -ENOMEM;
upayload = kmalloc(sizeof(*upayload) + datalen, GFP_KERNEL);
if (!upayload)
goto error;
return -ENOMEM;
/* attach the data */
prep->quotalen = datalen;
prep->payload[0] = upayload;
upayload->datalen = datalen;
memcpy(upayload->data, prep->data, datalen);
rcu_assign_keypointer(key, upayload);
ret = 0;
error:
return ret;
return 0;
}
EXPORT_SYMBOL_GPL(user_preparse);
EXPORT_SYMBOL_GPL(user_instantiate);
/*
* Free a preparse of a user defined key payload
*/
void user_free_preparse(struct key_preparsed_payload *prep)
{
kfree(prep->payload[0]);
}
EXPORT_SYMBOL_GPL(user_free_preparse);
/*
* update a user defined key