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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-or-later
 /* Request a key from userspace
  *
  * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)
  *
  * See Documentation/security/keys/request-key.rst
  */
 
 #include <linux/export.h>
 #include <linux/sched.h>
 #include <linux/kmod.h>
 #include <linux/err.h>
 #include <linux/keyctl.h>
 #include <linux/slab.h>
 #include <net/net_namespace.h>
 #include "internal.h"
 #include <keys/request_key_auth-type.h>
 
 #define key_negative_timeout    60  /* default timeout on a negative key's existence */
 
 static struct key *check_cached_key(struct keyring_search_context *ctx)
 {
 #ifdef CONFIG_KEYS_REQUEST_CACHE
     struct key *key = current->cached_requested_key;
 
     if (key &&
         ctx->match_data.cmp(key, &ctx->match_data) &&
         !(key->flags & ((1 << KEY_FLAG_INVALIDATED) |
                 (1 << KEY_FLAG_REVOKED))))
         return key_get(key);
 #endif
     return NULL;
 }
 
 static void cache_requested_key(struct key *key)
 {
 #ifdef CONFIG_KEYS_REQUEST_CACHE
     struct task_struct *t = current;
 
     key_put(t->cached_requested_key);
     t->cached_requested_key = key_get(key);
     set_tsk_thread_flag(t, TIF_NOTIFY_RESUME);
 #endif
 }
 
 /**
  * complete_request_key - Complete the construction of a key.
  * @authkey: The authorisation key.
  * @error: The success or failute of the construction.
  *
  * Complete the attempt to construct a key.  The key will be negated
  * if an error is indicated.  The authorisation key will be revoked
  * unconditionally.
  */
 void complete_request_key(struct key *authkey, int error)
 {
     struct request_key_auth *rka = get_request_key_auth(authkey);
     struct key *key = rka->target_key;
 
     kenter("%d{%d},%d", authkey->serial, key->serial, error);
 
     if (error < 0)
         key_negate_and_link(key, key_negative_timeout, NULL, authkey);
     else
         key_revoke(authkey);
 }
 EXPORT_SYMBOL(complete_request_key);
 
 /*
  * Initialise a usermode helper that is going to have a specific session
  * keyring.
  *
  * This is called in context of freshly forked kthread before kernel_execve(),
  * so we can simply install the desired session_keyring at this point.
  */
 static int umh_keys_init(struct subprocess_info *info, struct cred *cred)
 {
     struct key *keyring = info->data;
 
     return install_session_keyring_to_cred(cred, keyring);
 }
 
 /*
  * Clean up a usermode helper with session keyring.
  */
 static void umh_keys_cleanup(struct subprocess_info *info)
 {
     struct key *keyring = info->data;
     key_put(keyring);
 }
 
 /*
  * Call a usermode helper with a specific session keyring.
  */
 static int call_usermodehelper_keys(const char *path, char **argv, char **envp,
                     struct key *session_keyring, int wait)
 {
     struct subprocess_info *info;
 
     info = call_usermodehelper_setup(path, argv, envp, GFP_KERNEL,
                       umh_keys_init, umh_keys_cleanup,
                       session_keyring);
     if (!info)
         return -ENOMEM;
 
     key_get(session_keyring);
     return call_usermodehelper_exec(info, wait);
 }
 
 /*
  * Request userspace finish the construction of a key
  * - execute "/sbin/request-key <op> <key> <uid> <gid> <keyring> <keyring> <keyring>"
  */
 static int call_sbin_request_key(struct key *authkey, void *aux)
 {
     static char const request_key[] = "/sbin/request-key";
     struct request_key_auth *rka = get_request_key_auth(authkey);
     const struct cred *cred = current_cred();
     key_serial_t prkey, sskey;
     struct key *key = rka->target_key, *keyring, *session, *user_session;
     char *argv[9], *envp[3], uid_str[12], gid_str[12];
     char key_str[12], keyring_str[3][12];
     char desc[20];
     int ret, i;
 
     kenter("{%d},{%d},%s", key->serial, authkey->serial, rka->op);
 
     ret = look_up_user_keyrings(NULL, &user_session);
     if (ret < 0)
         goto error_us;
 
     /* allocate a new session keyring */
     sprintf(desc, "_req.%u", key->serial);
 
     cred = get_current_cred();
     keyring = keyring_alloc(desc, cred->fsuid, cred->fsgid, cred,
                 KEY_POS_ALL | KEY_USR_VIEW | KEY_USR_READ,
                 KEY_ALLOC_QUOTA_OVERRUN, NULL, NULL);
     put_cred(cred);
     if (IS_ERR(keyring)) {
         ret = PTR_ERR(keyring);
         goto error_alloc;
     }
 
     /* attach the auth key to the session keyring */
     ret = key_link(keyring, authkey);
     if (ret < 0)
         goto error_link;
 
     /* record the UID and GID */
     sprintf(uid_str, "%d", from_kuid(&init_user_ns, cred->fsuid));
     sprintf(gid_str, "%d", from_kgid(&init_user_ns, cred->fsgid));
 
     /* we say which key is under construction */
     sprintf(key_str, "%d", key->serial);
 
     /* we specify the process's default keyrings */
     sprintf(keyring_str[0], "%d",
         cred->thread_keyring ? cred->thread_keyring->serial : 0);
 
     prkey = 0;
     if (cred->process_keyring)
         prkey = cred->process_keyring->serial;
     sprintf(keyring_str[1], "%d", prkey);
 
     session = cred->session_keyring;
     if (!session)
         session = user_session;
     sskey = session->serial;
 
     sprintf(keyring_str[2], "%d", sskey);
 
     /* set up a minimal environment */
     i = 0;
     envp[i++] = "HOME=/";
     envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
     envp[i] = NULL;
 
     /* set up the argument list */
     i = 0;
     argv[i++] = (char *)request_key;
     argv[i++] = (char *)rka->op;
     argv[i++] = key_str;
     argv[i++] = uid_str;
     argv[i++] = gid_str;
     argv[i++] = keyring_str[0];
     argv[i++] = keyring_str[1];
     argv[i++] = keyring_str[2];
     argv[i] = NULL;
 
     /* do it */
     ret = call_usermodehelper_keys(request_key, argv, envp, keyring,
                        UMH_WAIT_PROC);
     kdebug("usermode -> 0x%x", ret);
     if (ret >= 0) {
         /* ret is the exit/wait code */
         if (test_bit(KEY_FLAG_USER_CONSTRUCT, &key->flags) ||
             key_validate(key) < 0)
             ret = -ENOKEY;
         else
             /* ignore any errors from userspace if the key was
              * instantiated */
             ret = 0;
     }
 
 error_link:
     key_put(keyring);
 
 error_alloc:
     key_put(user_session);
 error_us:
     complete_request_key(authkey, ret);
     kleave(" = %d", ret);
     return ret;
 }
 
 /*
  * Call out to userspace for key construction.
  *
  * Program failure is ignored in favour of key status.
  */
 static int construct_key(struct key *key, const void *callout_info,
              size_t callout_len, void *aux,
              struct key *dest_keyring)
 {
     request_key_actor_t actor;
     struct key *authkey;
     int ret;
 
     kenter("%d,%p,%zu,%p", key->serial, callout_info, callout_len, aux);
 
     /* allocate an authorisation key */
     authkey = request_key_auth_new(key, "create", callout_info, callout_len,
                        dest_keyring);
     if (IS_ERR(authkey))
         return PTR_ERR(authkey);
 
     /* Make the call */
     actor = call_sbin_request_key;
     if (key->type->request_key)
         actor = key->type->request_key;
 
     ret = actor(authkey, aux);
 
     /* check that the actor called complete_request_key() prior to
      * returning an error */
     WARN_ON(ret < 0 &&
         !test_bit(KEY_FLAG_INVALIDATED, &authkey->flags));
 
     key_put(authkey);
     kleave(" = %d", ret);
     return ret;
 }
 
 /*
  * Get the appropriate destination keyring for the request.
  *
  * The keyring selected is returned with an extra reference upon it which the
  * caller must release.
  */
 static int construct_get_dest_keyring(struct key **_dest_keyring)
 {
     struct request_key_auth *rka;
     const struct cred *cred = current_cred();
     struct key *dest_keyring = *_dest_keyring, *authkey;
     int ret;
 
     kenter("%p", dest_keyring);
 
     /* find the appropriate keyring */
     if (dest_keyring) {
         /* the caller supplied one */
         key_get(dest_keyring);
     } else {
         bool do_perm_check = true;
 
         /* use a default keyring; falling through the cases until we
          * find one that we actually have */
         switch (cred->jit_keyring) {
         case KEY_REQKEY_DEFL_DEFAULT:
         case KEY_REQKEY_DEFL_REQUESTOR_KEYRING:
             if (cred->request_key_auth) {
                 authkey = cred->request_key_auth;
                 down_read(&authkey->sem);
                 rka = get_request_key_auth(authkey);
                 if (!test_bit(KEY_FLAG_REVOKED,
                           &authkey->flags))
                     dest_keyring =
                         key_get(rka->dest_keyring);
                 up_read(&authkey->sem);
                 if (dest_keyring) {
                     do_perm_check = false;
                     break;
                 }
             }
 
             fallthrough;
         case KEY_REQKEY_DEFL_THREAD_KEYRING:
             dest_keyring = key_get(cred->thread_keyring);
             if (dest_keyring)
                 break;
 
             fallthrough;
         case KEY_REQKEY_DEFL_PROCESS_KEYRING:
             dest_keyring = key_get(cred->process_keyring);
             if (dest_keyring)
                 break;
 
             fallthrough;
         case KEY_REQKEY_DEFL_SESSION_KEYRING:
             dest_keyring = key_get(cred->session_keyring);
 
             if (dest_keyring)
                 break;
 
             fallthrough;
         case KEY_REQKEY_DEFL_USER_SESSION_KEYRING:
             ret = look_up_user_keyrings(NULL, &dest_keyring);
             if (ret < 0)
                 return ret;
             break;
 
         case KEY_REQKEY_DEFL_USER_KEYRING:
             ret = look_up_user_keyrings(&dest_keyring, NULL);
             if (ret < 0)
                 return ret;
             break;
 
         case KEY_REQKEY_DEFL_GROUP_KEYRING:
         default:
             BUG();
         }
 
         /*
          * Require Write permission on the keyring.  This is essential
          * because the default keyring may be the session keyring, and
          * joining a keyring only requires Search permission.
          *
          * However, this check is skipped for the "requestor keyring" so
          * that /sbin/request-key can itself use request_key() to add
          * keys to the original requestor's destination keyring.
          */
         if (dest_keyring && do_perm_check) {
             ret = key_permission(make_key_ref(dest_keyring, 1),
                          KEY_NEED_WRITE);
             if (ret) {
                 key_put(dest_keyring);
                 return ret;
             }
         }
     }
 
     *_dest_keyring = dest_keyring;
     kleave(" [dk %d]", key_serial(dest_keyring));
     return 0;
 }
 
 /*
  * Allocate a new key in under-construction state and attempt to link it in to
  * the requested keyring.
  *
  * May return a key that's already under construction instead if there was a
  * race between two thread calling request_key().
  */
 static int construct_alloc_key(struct keyring_search_context *ctx,
                    struct key *dest_keyring,
                    unsigned long flags,
                    struct key_user *user,
                    struct key **_key)
 {
     struct assoc_array_edit *edit = NULL;
     struct key *key;
     key_perm_t perm;
     key_ref_t key_ref;
     int ret;
 
     kenter("%s,%s,,,",
            ctx->index_key.type->name, ctx->index_key.description);
 
     *_key = NULL;
     mutex_lock(&user->cons_lock);
 
     perm = KEY_POS_VIEW | KEY_POS_SEARCH | KEY_POS_LINK | KEY_POS_SETATTR;
     perm |= KEY_USR_VIEW;
     if (ctx->index_key.type->read)
         perm |= KEY_POS_READ;
     if (ctx->index_key.type == &key_type_keyring ||
         ctx->index_key.type->update)
         perm |= KEY_POS_WRITE;
 
     key = key_alloc(ctx->index_key.type, ctx->index_key.description,
             ctx->cred->fsuid, ctx->cred->fsgid, ctx->cred,
             perm, flags, NULL);
     if (IS_ERR(key))
         goto alloc_failed;
 
     set_bit(KEY_FLAG_USER_CONSTRUCT, &key->flags);
 
     if (dest_keyring) {
         ret = __key_link_lock(dest_keyring, &ctx->index_key);
         if (ret < 0)
             goto link_lock_failed;
         ret = __key_link_begin(dest_keyring, &ctx->index_key, &edit);
         if (ret < 0)
             goto link_prealloc_failed;
     }
 
     /* attach the key to the destination keyring under lock, but we do need
      * to do another check just in case someone beat us to it whilst we
      * waited for locks */
     mutex_lock(&key_construction_mutex);
 
     rcu_read_lock();
     key_ref = search_process_keyrings_rcu(ctx);
     rcu_read_unlock();
     if (!IS_ERR(key_ref))
         goto key_already_present;
 
     if (dest_keyring)
         __key_link(dest_keyring, key, &edit);
 
     mutex_unlock(&key_construction_mutex);
     if (dest_keyring)
         __key_link_end(dest_keyring, &ctx->index_key, edit);
     mutex_unlock(&user->cons_lock);
     *_key = key;
     kleave(" = 0 [%d]", key_serial(key));
     return 0;
 
     /* the key is now present - we tell the caller that we found it by
      * returning -EINPROGRESS  */
 key_already_present:
     key_put(key);
     mutex_unlock(&key_construction_mutex);
     key = key_ref_to_ptr(key_ref);
     if (dest_keyring) {
         ret = __key_link_check_live_key(dest_keyring, key);
         if (ret == 0)
             __key_link(dest_keyring, key, &edit);
         __key_link_end(dest_keyring, &ctx->index_key, edit);
         if (ret < 0)
             goto link_check_failed;
     }
     mutex_unlock(&user->cons_lock);
     *_key = key;
     kleave(" = -EINPROGRESS [%d]", key_serial(key));
     return -EINPROGRESS;
 
 link_check_failed:
     mutex_unlock(&user->cons_lock);
     key_put(key);
     kleave(" = %d [linkcheck]", ret);
     return ret;
 
 link_prealloc_failed:
     __key_link_end(dest_keyring, &ctx->index_key, edit);
 link_lock_failed:
     mutex_unlock(&user->cons_lock);
     key_put(key);
     kleave(" = %d [prelink]", ret);
     return ret;
 
 alloc_failed:
     mutex_unlock(&user->cons_lock);
     kleave(" = %ld", PTR_ERR(key));
     return PTR_ERR(key);
 }
 
 /*
  * Commence key construction.
  */
 static struct key *construct_key_and_link(struct keyring_search_context *ctx,
                       const char *callout_info,
                       size_t callout_len,
                       void *aux,
                       struct key *dest_keyring,
                       unsigned long flags)
 {
     struct key_user *user;
     struct key *key;
     int ret;
 
     kenter("");
 
     if (ctx->index_key.type == &key_type_keyring)
         return ERR_PTR(-EPERM);
 
     ret = construct_get_dest_keyring(&dest_keyring);
     if (ret)
         goto error;
 
     user = key_user_lookup(current_fsuid());
     if (!user) {
         ret = -ENOMEM;
         goto error_put_dest_keyring;
     }
 
     ret = construct_alloc_key(ctx, dest_keyring, flags, user, &key);
     key_user_put(user);
 
     if (ret == 0) {
         ret = construct_key(key, callout_info, callout_len, aux,
                     dest_keyring);
         if (ret < 0) {
             kdebug("cons failed");
             goto construction_failed;
         }
     } else if (ret == -EINPROGRESS) {
         ret = 0;
     } else {
         goto error_put_dest_keyring;
     }
 
     key_put(dest_keyring);
     kleave(" = key %d", key_serial(key));
     return key;
 
 construction_failed:
     key_negate_and_link(key, key_negative_timeout, NULL, NULL);
     key_put(key);
 error_put_dest_keyring:
     key_put(dest_keyring);
 error:
     kleave(" = %d", ret);
     return ERR_PTR(ret);
 }
 
 /**
  * request_key_and_link - Request a key and cache it in a keyring.
  * @type: The type of key we want.
  * @description: The searchable description of the key.
  * @domain_tag: The domain in which the key operates.
  * @callout_info: The data to pass to the instantiation upcall (or NULL).
  * @callout_len: The length of callout_info.
  * @aux: Auxiliary data for the upcall.
  * @dest_keyring: Where to cache the key.
  * @flags: Flags to key_alloc().
  *
  * A key matching the specified criteria (type, description, domain_tag) is
  * searched for in the process's keyrings and returned with its usage count
  * incremented if found.  Otherwise, if callout_info is not NULL, a key will be
  * allocated and some service (probably in userspace) will be asked to
  * instantiate it.
  *
  * If successfully found or created, the key will be linked to the destination
  * keyring if one is provided.
  *
  * Returns a pointer to the key if successful; -EACCES, -ENOKEY, -EKEYREVOKED
  * or -EKEYEXPIRED if an inaccessible, negative, revoked or expired key was
  * found; -ENOKEY if no key was found and no @callout_info was given; -EDQUOT
  * if insufficient key quota was available to create a new key; or -ENOMEM if
  * insufficient memory was available.
  *
  * If the returned key was created, then it may still be under construction,
  * and wait_for_key_construction() should be used to wait for that to complete.
  */
 struct key *request_key_and_link(struct key_type *type,
                  const char *description,
                  struct key_tag *domain_tag,
                  const void *callout_info,
                  size_t callout_len,
                  void *aux,
                  struct key *dest_keyring,
                  unsigned long flags)
 {
     struct keyring_search_context ctx = {
         .index_key.type     = type,
         .index_key.domain_tag   = domain_tag,
         .index_key.description  = description,
         .index_key.desc_len = strlen(description),
         .cred           = current_cred(),
         .match_data.cmp     = key_default_cmp,
         .match_data.raw_data    = description,
         .match_data.lookup_type = KEYRING_SEARCH_LOOKUP_DIRECT,
         .flags          = (KEYRING_SEARCH_DO_STATE_CHECK |
                        KEYRING_SEARCH_SKIP_EXPIRED |
                        KEYRING_SEARCH_RECURSE),
     };
     struct key *key;
     key_ref_t key_ref;
     int ret;
 
     kenter("%s,%s,%p,%zu,%p,%p,%lx",
            ctx.index_key.type->name, ctx.index_key.description,
            callout_info, callout_len, aux, dest_keyring, flags);
 
     if (type->match_preparse) {
         ret = type->match_preparse(&ctx.match_data);
         if (ret < 0) {
             key = ERR_PTR(ret);
             goto error;
         }
     }
 
     key = check_cached_key(&ctx);
     if (key)
         goto error_free;
 
     /* search all the process keyrings for a key */
     rcu_read_lock();
     key_ref = search_process_keyrings_rcu(&ctx);
     rcu_read_unlock();
 
     if (!IS_ERR(key_ref)) {
         if (dest_keyring) {
             ret = key_task_permission(key_ref, current_cred(),
                           KEY_NEED_LINK);
             if (ret < 0) {
                 key_ref_put(key_ref);
                 key = ERR_PTR(ret);
                 goto error_free;
             }
         }
 
         key = key_ref_to_ptr(key_ref);
         if (dest_keyring) {
             ret = key_link(dest_keyring, key);
             if (ret < 0) {
                 key_put(key);
                 key = ERR_PTR(ret);
                 goto error_free;
             }
         }
 
         /* Only cache the key on immediate success */
         cache_requested_key(key);
     } else if (PTR_ERR(key_ref) != -EAGAIN) {
         key = ERR_CAST(key_ref);
     } else  {
         /* the search failed, but the keyrings were searchable, so we
          * should consult userspace if we can */
         key = ERR_PTR(-ENOKEY);
         if (!callout_info)
             goto error_free;
 
         key = construct_key_and_link(&ctx, callout_info, callout_len,
                          aux, dest_keyring, flags);
     }
 
 error_free:
     if (type->match_free)
         type->match_free(&ctx.match_data);
 error:
     kleave(" = %p", key);
     return key;
 }
 
 /**
  * wait_for_key_construction - Wait for construction of a key to complete
  * @key: The key being waited for.
  * @intr: Whether to wait interruptibly.
  *
  * Wait for a key to finish being constructed.
  *
  * Returns 0 if successful; -ERESTARTSYS if the wait was interrupted; -ENOKEY
  * if the key was negated; or -EKEYREVOKED or -EKEYEXPIRED if the key was
  * revoked or expired.
  */
 int wait_for_key_construction(struct key *key, bool intr)
 {
     int ret;
 
     ret = wait_on_bit(&key->flags, KEY_FLAG_USER_CONSTRUCT,
               intr ? TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
     if (ret)
         return -ERESTARTSYS;
     ret = key_read_state(key);
     if (ret < 0)
         return ret;
     return key_validate(key);
 }
 EXPORT_SYMBOL(wait_for_key_construction);
 
 /**
  * request_key_tag - Request a key and wait for construction
  * @type: Type of key.
  * @description: The searchable description of the key.
  * @domain_tag: The domain in which the key operates.
  * @callout_info: The data to pass to the instantiation upcall (or NULL).
  *
  * As for request_key_and_link() except that it does not add the returned key
  * to a keyring if found, new keys are always allocated in the user's quota,
  * the callout_info must be a NUL-terminated string and no auxiliary data can
  * be passed.
  *
  * Furthermore, it then works as wait_for_key_construction() to wait for the
  * completion of keys undergoing construction with a non-interruptible wait.
  */
 struct key *request_key_tag(struct key_type *type,
                 const char *description,
                 struct key_tag *domain_tag,
                 const char *callout_info)
 {
     struct key *key;
     size_t callout_len = 0;
     int ret;
 
     if (callout_info)
         callout_len = strlen(callout_info);
     key = request_key_and_link(type, description, domain_tag,
                    callout_info, callout_len,
                    NULL, NULL, KEY_ALLOC_IN_QUOTA);
     if (!IS_ERR(key)) {
         ret = wait_for_key_construction(key, false);
         if (ret < 0) {
             key_put(key);
             return ERR_PTR(ret);
         }
     }
     return key;
 }
 EXPORT_SYMBOL(request_key_tag);
 
 /**
  * request_key_with_auxdata - Request a key with auxiliary data for the upcaller
  * @type: The type of key we want.
  * @description: The searchable description of the key.
  * @domain_tag: The domain in which the key operates.
  * @callout_info: The data to pass to the instantiation upcall (or NULL).
  * @callout_len: The length of callout_info.
  * @aux: Auxiliary data for the upcall.
  *
  * As for request_key_and_link() except that it does not add the returned key
  * to a keyring if found and new keys are always allocated in the user's quota.
  *
  * Furthermore, it then works as wait_for_key_construction() to wait for the
  * completion of keys undergoing construction with a non-interruptible wait.
  */
 struct key *request_key_with_auxdata(struct key_type *type,
                      const char *description,
                      struct key_tag *domain_tag,
                      const void *callout_info,
                      size_t callout_len,
                      void *aux)
 {
     struct key *key;
     int ret;
 
     key = request_key_and_link(type, description, domain_tag,
                    callout_info, callout_len,
                    aux, NULL, KEY_ALLOC_IN_QUOTA);
     if (!IS_ERR(key)) {
         ret = wait_for_key_construction(key, false);
         if (ret < 0) {
             key_put(key);
             return ERR_PTR(ret);
         }
     }
     return key;
 }
 EXPORT_SYMBOL(request_key_with_auxdata);
 
 /**
  * request_key_rcu - Request key from RCU-read-locked context
  * @type: The type of key we want.
  * @description: The name of the key we want.
  * @domain_tag: The domain in which the key operates.
  *
  * Request a key from a context that we may not sleep in (such as RCU-mode
  * pathwalk).  Keys under construction are ignored.
  *
  * Return a pointer to the found key if successful, -ENOKEY if we couldn't find
  * a key or some other error if the key found was unsuitable or inaccessible.
  */
 struct key *request_key_rcu(struct key_type *type,
                 const char *description,
                 struct key_tag *domain_tag)
 {
     struct keyring_search_context ctx = {
         .index_key.type     = type,
         .index_key.domain_tag   = domain_tag,
         .index_key.description  = description,
         .index_key.desc_len = strlen(description),
         .cred           = current_cred(),
         .match_data.cmp     = key_default_cmp,
         .match_data.raw_data    = description,
         .match_data.lookup_type = KEYRING_SEARCH_LOOKUP_DIRECT,
         .flags          = (KEYRING_SEARCH_DO_STATE_CHECK |
                        KEYRING_SEARCH_SKIP_EXPIRED),
     };
     struct key *key;
     key_ref_t key_ref;
 
     kenter("%s,%s", type->name, description);
 
     key = check_cached_key(&ctx);
     if (key)
         return key;
 
     /* search all the process keyrings for a key */
     key_ref = search_process_keyrings_rcu(&ctx);
     if (IS_ERR(key_ref)) {
         key = ERR_CAST(key_ref);
         if (PTR_ERR(key_ref) == -EAGAIN)
             key = ERR_PTR(-ENOKEY);
     } else {
         key = key_ref_to_ptr(key_ref);
         cache_requested_key(key);
     }
 
     kleave(" = %p", key);
     return key;
 }
 EXPORT_SYMBOL(request_key_rcu);

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