From b6f61c31464940513ef4eccb3a030a405b4256d6 Mon Sep 17 00:00:00 2001 From: David Howells Date: Tue, 12 May 2020 14:03:53 +0100 Subject: [PATCH] keys: Implement update for the big_key type Implement the ->update op for the big_key type. Signed-off-by: David Howells Acked-by: Jason A. Donenfeld --- include/keys/big_key-type.h | 1 + security/keys/big_key.c | 19 ++++++++++++++++++- 2 files changed, 19 insertions(+), 1 deletion(-) diff --git a/include/keys/big_key-type.h b/include/keys/big_key-type.h index 3fee04f81439..988d90d77f53 100644 --- a/include/keys/big_key-type.h +++ b/include/keys/big_key-type.h @@ -18,5 +18,6 @@ extern void big_key_revoke(struct key *key); extern void big_key_destroy(struct key *key); extern void big_key_describe(const struct key *big_key, struct seq_file *m); extern long big_key_read(const struct key *key, char *buffer, size_t buflen); +extern int big_key_update(struct key *key, struct key_preparsed_payload *prep); #endif /* _KEYS_BIG_KEY_TYPE_H */ diff --git a/security/keys/big_key.c b/security/keys/big_key.c index d43f3daab2b8..dd708e8f13c0 100644 --- a/security/keys/big_key.c +++ b/security/keys/big_key.c @@ -47,7 +47,7 @@ struct key_type key_type_big_key = { .destroy = big_key_destroy, .describe = big_key_describe, .read = big_key_read, - /* no ->update(); don't add it without changing chacha20poly1305's nonce */ + .update = big_key_update, }; /* @@ -191,6 +191,23 @@ void big_key_destroy(struct key *key) key->payload.data[big_key_data] = NULL; } +/* + * Update a big key + */ +int big_key_update(struct key *key, struct key_preparsed_payload *prep) +{ + int ret; + + ret = key_payload_reserve(key, prep->datalen); + if (ret < 0) + return ret; + + if (key_is_positive(key)) + big_key_destroy(key); + + return generic_key_instantiate(key, prep); +} + /* * describe the big_key key */