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keys: Implement update for the big_key type

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Implement the ->update op for the big_key type.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
David Howells 2020-05-12 14:03:53 +01:00
parent 521fd61c84
commit b6f61c3146
2 changed files with 19 additions and 1 deletions
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1
include/keys/big_key-type.h
View File

@ -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 */

19
security/keys/big_key.c
View File

@ -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
*/