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-rw-r--r--security/keys/process_keys.c42
1 files changed, 26 insertions, 16 deletions
diff --git a/security/keys/process_keys.c b/security/keys/process_keys.c
index a50a91332fe1..4d9825f9962c 100644
--- a/security/keys/process_keys.c
+++ b/security/keys/process_keys.c
@@ -391,6 +391,8 @@ key_ref_t search_process_keyrings(struct key_type *type,
struct request_key_auth *rka;
key_ref_t key_ref, ret, err;
+ might_sleep();
+
/* we want to return -EAGAIN or -ENOKEY if any of the keyrings were
* searchable, but we failed to find a key or we found a negative key;
* otherwise we want to return a sample error (probably -EACCES) if
@@ -496,27 +498,35 @@ key_ref_t search_process_keyrings(struct key_type *type,
*/
if (context->request_key_auth &&
context == current &&
- type != &key_type_request_key_auth &&
- key_validate(context->request_key_auth) == 0
+ type != &key_type_request_key_auth
) {
- rka = context->request_key_auth->payload.data;
+ /* defend against the auth key being revoked */
+ down_read(&context->request_key_auth->sem);
- key_ref = search_process_keyrings(type, description, match,
- rka->context);
+ if (key_validate(context->request_key_auth) == 0) {
+ rka = context->request_key_auth->payload.data;
- if (!IS_ERR(key_ref))
- goto found;
+ key_ref = search_process_keyrings(type, description,
+ match, rka->context);
- switch (PTR_ERR(key_ref)) {
- case -EAGAIN: /* no key */
- if (ret)
+ up_read(&context->request_key_auth->sem);
+
+ if (!IS_ERR(key_ref))
+ goto found;
+
+ switch (PTR_ERR(key_ref)) {
+ case -EAGAIN: /* no key */
+ if (ret)
+ break;
+ case -ENOKEY: /* negative key */
+ ret = key_ref;
break;
- case -ENOKEY: /* negative key */
- ret = key_ref;
- break;
- default:
- err = key_ref;
- break;
+ default:
+ err = key_ref;
+ break;
+ }
+ } else {
+ up_read(&context->request_key_auth->sem);
}
}