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);
                 }
         }