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authorHerbert Xu <herbert@gondor.apana.org.au>2019-12-18 15:53:01 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2019-12-27 18:18:03 +0800
commit5f567fffaae995dce3498e175e47d5a779fb0270 (patch)
tree5c9d1ea0730f324296ef35af028bbd1042c066e6 /include/crypto
parentcrypto: sun4i-ss - make unexported sun4i_ss_pm_ops static (diff)
downloadwireguard-linux-5f567fffaae995dce3498e175e47d5a779fb0270.tar.xz
wireguard-linux-5f567fffaae995dce3498e175e47d5a779fb0270.zip
crypto: api - Retain alg refcount in crypto_grab_spawn
This patch changes crypto_grab_spawn to retain the reference count on the algorithm. This is because the caller needs to access the algorithm parameters and without the reference count the algorithm can be freed at any time. The reference count will be subsequently dropped by the crypto API once the instance has been registered. The helper crypto_drop_spawn will also conditionally drop the reference count depending on whether it has been registered. Note that the code is actually added to crypto_init_spawn. However, unless the caller activates this by setting spawn->dropref beforehand then nothing happens. The only caller that sets dropref is currently crypto_grab_spawn. Once all legacy users of crypto_init_spawn disappear, then we can kill the dropref flag. Internally each instance will maintain a list of its spawns prior to registration. This memory used by this list is shared with other fields that are only used after registration. In order for this to work a new flag spawn->registered is added to indicate whether spawn->inst can be used. Fixes: d6ef2f198d4c ("crypto: api - Add crypto_grab_spawn primitive") Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include/crypto')
-rw-r--r--include/crypto/algapi.h17
1 files changed, 15 insertions, 2 deletions
diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index 25661b4650ec..5022cada4fc6 100644
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -47,7 +47,13 @@ struct crypto_instance {
struct crypto_alg alg;
struct crypto_template *tmpl;
- struct hlist_node list;
+
+ union {
+ /* Node in list of instances after registration. */
+ struct hlist_node list;
+ /* List of attached spawns before registration. */
+ struct crypto_spawn *spawns;
+ };
void *__ctx[] CRYPTO_MINALIGN_ATTR;
};
@@ -67,10 +73,17 @@ struct crypto_template {
struct crypto_spawn {
struct list_head list;
struct crypto_alg *alg;
- struct crypto_instance *inst;
+ union {
+ /* Back pointer to instance after registration.*/
+ struct crypto_instance *inst;
+ /* Spawn list pointer prior to registration. */
+ struct crypto_spawn *next;
+ };
const struct crypto_type *frontend;
u32 mask;
bool dead;
+ bool dropref;
+ bool registered;
};
struct crypto_queue {