218 	struct cred *new;  in cred_alloc_blank()  local
220 	new = kmem_cache_zalloc(cred_jar, GFP_KERNEL);  in cred_alloc_blank()
221 	if (!new)  in cred_alloc_blank()
224 	atomic_set(&new->usage, 1);  in cred_alloc_blank()
226 	new->magic = CRED_MAGIC;  in cred_alloc_blank()
228 	if (security_cred_alloc_blank(new, GFP_KERNEL_ACCOUNT) < 0)  in cred_alloc_blank()
231 	return new;  in cred_alloc_blank()
234 	abort_creds(new);  in cred_alloc_blank()
239  * prepare_creds - Prepare a new set of credentials for modification
241  * Prepare a new set of task credentials for modification.  A task's creds
243  * prepare a new copy, which the caller then modifies and then commits by
248  * Returns a pointer to the new creds-to-be if successful, NULL otherwise.
256 	struct cred *new;  in prepare_creds()  local
260 	new = kmem_cache_alloc(cred_jar, GFP_KERNEL);  in prepare_creds()
261 	if (!new)  in prepare_creds()
264 	kdebug("prepare_creds() alloc %p", new);  in prepare_creds()
267 	memcpy(new, old, sizeof(struct cred));  in prepare_creds()
269 	new->non_rcu = 0;  in prepare_creds()
270 	atomic_set(&new->usage, 1);  in prepare_creds()
271 	set_cred_subscribers(new, 0);  in prepare_creds()
272 	get_group_info(new->group_info);  in prepare_creds()
273 	get_uid(new->user);  in prepare_creds()
274 	get_user_ns(new->user_ns);  in prepare_creds()
277 	key_get(new->session_keyring);  in prepare_creds()
278 	key_get(new->process_keyring);  in prepare_creds()
279 	key_get(new->thread_keyring);  in prepare_creds()
280 	key_get(new->request_key_auth);  in prepare_creds()
284 	new->security = NULL;  in prepare_creds()
287 	new->ucounts = get_ucounts(new->ucounts);  in prepare_creds()
288 	if (!new->ucounts)  in prepare_creds()
291 	if (security_prepare_creds(new, old, GFP_KERNEL_ACCOUNT) < 0)  in prepare_creds()
294 	validate_creds(new);  in prepare_creds()
295 	return new;  in prepare_creds()
298 	abort_creds(new);  in prepare_creds()
309 	struct cred *new;  in prepare_exec_creds()  local
311 	new = prepare_creds();  in prepare_exec_creds()
312 	if (!new)  in prepare_exec_creds()
313 		return new;  in prepare_exec_creds()
317 	key_put(new->thread_keyring);  in prepare_exec_creds()
318 	new->thread_keyring = NULL;  in prepare_exec_creds()
320 	/* inherit the session keyring; new process keyring */  in prepare_exec_creds()
321 	key_put(new->process_keyring);  in prepare_exec_creds()
322 	new->process_keyring = NULL;  in prepare_exec_creds()
325 	new->suid = new->fsuid = new->euid;  in prepare_exec_creds()
326 	new->sgid = new->fsgid = new->egid;  in prepare_exec_creds()
328 	return new;  in prepare_exec_creds()
332  * Copy credentials for the new process created by fork()
334  * We share if we can, but under some circumstances we have to generate a new
337  * The new process gets the current process's subjective credentials as its
342 	struct cred *new;  in copy_creds()  local
365 	new = prepare_creds();  in copy_creds()
366 	if (!new)  in copy_creds()
370 		ret = create_user_ns(new);  in copy_creds()
373 		ret = set_cred_ucounts(new);  in copy_creds()
379 	/* new threads get their own thread keyrings if their parent already  in copy_creds()
381 	if (new->thread_keyring) {  in copy_creds()
382 		key_put(new->thread_keyring);  in copy_creds()
383 		new->thread_keyring = NULL;  in copy_creds()
385 			install_thread_keyring_to_cred(new);  in copy_creds()
392 		key_put(new->process_keyring);  in copy_creds()
393 		new->process_keyring = NULL;  in copy_creds()
397 	p->cred = p->real_cred = get_cred(new);  in copy_creds()
399 	alter_cred_subscribers(new, 2);  in copy_creds()
400 	validate_creds(new);  in copy_creds()
404 	put_cred(new);  in copy_creds()
434  * commit_creds - Install new credentials upon the current task
435  * @new: The credentials to be assigned
437  * Install a new set of credentials to the current task, using RCU to replace
442  * This function eats the caller's reference to the new credentials.
447 int commit_creds(struct cred *new)  in commit_creds()  argument
452 	kdebug("commit_creds(%p{%d,%d})", new,  in commit_creds()
453 	       atomic_read(&new->usage),  in commit_creds()
454 	       read_cred_subscribers(new));  in commit_creds()
460 	validate_creds(new);  in commit_creds()
462 	BUG_ON(atomic_read(&new->usage) < 1);  in commit_creds()
464 	get_cred(new); /* we will require a ref for the subj creds too */  in commit_creds()
467 	if (!uid_eq(old->euid, new->euid) ||  in commit_creds()
468 	    !gid_eq(old->egid, new->egid) ||  in commit_creds()
469 	    !uid_eq(old->fsuid, new->fsuid) ||  in commit_creds()
470 	    !gid_eq(old->fsgid, new->fsgid) ||  in commit_creds()
471 	    !cred_cap_issubset(old, new)) {  in commit_creds()
488 	if (!uid_eq(new->fsuid, old->fsuid))  in commit_creds()
489 		key_fsuid_changed(new);  in commit_creds()
490 	if (!gid_eq(new->fsgid, old->fsgid))  in commit_creds()
491 		key_fsgid_changed(new);  in commit_creds()
497 	alter_cred_subscribers(new, 2);  in commit_creds()
498 	if (new->user != old->user || new->user_ns != old->user_ns)  in commit_creds()
499 		inc_rlimit_ucounts(new->ucounts, UCOUNT_RLIMIT_NPROC, 1);  in commit_creds()
500 	rcu_assign_pointer(task->real_cred, new);  in commit_creds()
501 	rcu_assign_pointer(task->cred, new);  in commit_creds()
502 	if (new->user != old->user || new->user_ns != old->user_ns)  in commit_creds()
507 	if (!uid_eq(new->uid,   old->uid)  ||  in commit_creds()
508 	    !uid_eq(new->euid,  old->euid) ||  in commit_creds()
509 	    !uid_eq(new->suid,  old->suid) ||  in commit_creds()
510 	    !uid_eq(new->fsuid, old->fsuid))  in commit_creds()
513 	if (!gid_eq(new->gid,   old->gid)  ||  in commit_creds()
514 	    !gid_eq(new->egid,  old->egid) ||  in commit_creds()
515 	    !gid_eq(new->sgid,  old->sgid) ||  in commit_creds()
516 	    !gid_eq(new->fsgid, old->fsgid))  in commit_creds()
528  * @new: The credentials that were going to be applied
533 void abort_creds(struct cred *new)  in abort_creds()  argument
535 	kdebug("abort_creds(%p{%d,%d})", new,  in abort_creds()
536 	       atomic_read(&new->usage),  in abort_creds()
537 	       read_cred_subscribers(new));  in abort_creds()
540 	BUG_ON(read_cred_subscribers(new) != 0);  in abort_creds()
542 	BUG_ON(atomic_read(&new->usage) < 1);  in abort_creds()
543 	put_cred(new);  in abort_creds()
549  * @new: The credentials to be assigned
554 const struct cred *override_creds(const struct cred *new)  in override_creds()  argument
558 	kdebug("override_creds(%p{%d,%d})", new,  in override_creds()
559 	       atomic_read(&new->usage),  in override_creds()
560 	       read_cred_subscribers(new));  in override_creds()
563 	validate_creds(new);  in override_creds()
576 	get_new_cred((struct cred *)new);  in override_creds()
577 	alter_cred_subscribers(new, 1);  in override_creds()
578 	rcu_assign_pointer(current->cred, new);  in override_creds()
666 int set_cred_ucounts(struct cred *new)  in set_cred_ucounts()  argument
670 	struct ucounts *new_ucounts, *old_ucounts = new->ucounts;  in set_cred_ucounts()
672 	if (new->user == old->user && new->user_ns == old->user_ns)  in set_cred_ucounts()
679 	if (old_ucounts && old_ucounts->ns == new->user_ns && uid_eq(old_ucounts->uid, new->euid))  in set_cred_ucounts()
682 	if (!(new_ucounts = alloc_ucounts(new->user_ns, new->euid)))  in set_cred_ucounts()
685 	new->ucounts = new_ucounts;  in set_cred_ucounts()
716  * Returns the new credentials or NULL if out of memory.
721 	struct cred *new;  in prepare_kernel_cred()  local
723 	new = kmem_cache_alloc(cred_jar, GFP_KERNEL);  in prepare_kernel_cred()
724 	if (!new)  in prepare_kernel_cred()
727 	kdebug("prepare_kernel_cred() alloc %p", new);  in prepare_kernel_cred()
736 	*new = *old;  in prepare_kernel_cred()
737 	new->non_rcu = 0;  in prepare_kernel_cred()
738 	atomic_set(&new->usage, 1);  in prepare_kernel_cred()
739 	set_cred_subscribers(new, 0);  in prepare_kernel_cred()
740 	get_uid(new->user);  in prepare_kernel_cred()
741 	get_user_ns(new->user_ns);  in prepare_kernel_cred()
742 	get_group_info(new->group_info);  in prepare_kernel_cred()
745 	new->session_keyring = NULL;  in prepare_kernel_cred()
746 	new->process_keyring = NULL;  in prepare_kernel_cred()
747 	new->thread_keyring = NULL;  in prepare_kernel_cred()
748 	new->request_key_auth = NULL;  in prepare_kernel_cred()
749 	new->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING;  in prepare_kernel_cred()
753 	new->security = NULL;  in prepare_kernel_cred()
755 	new->ucounts = get_ucounts(new->ucounts);  in prepare_kernel_cred()
756 	if (!new->ucounts)  in prepare_kernel_cred()
759 	if (security_prepare_creds(new, old, GFP_KERNEL_ACCOUNT) < 0)  in prepare_kernel_cred()
763 	validate_creds(new);  in prepare_kernel_cred()
764 	return new;  in prepare_kernel_cred()
767 	put_cred(new);  in prepare_kernel_cred()
775  * @new: The credentials to alter
781 int set_security_override(struct cred *new, u32 secid)  in set_security_override()  argument
783 	return security_kernel_act_as(new, secid);  in set_security_override()
789  * @new: The credentials to alter
797 int set_security_override_from_ctx(struct cred *new, const char *secctx)  in set_security_override_from_ctx()  argument
806 	return set_security_override(new, secid);  in set_security_override_from_ctx()
812  * @new: The credentials to alter
816  * as the object context of the specified inode, so that the new inodes have
819 int set_create_files_as(struct cred *new, struct inode *inode)  in set_create_files_as()  argument
823 	new->fsuid = inode->i_uid;  in set_create_files_as()
824 	new->fsgid = inode->i_gid;  in set_create_files_as()
825 	return security_kernel_create_files_as(new, inode);  in set_create_files_as()