175 	struct cred *new;  in cred_alloc_blank()  local
177 	new = kmem_cache_zalloc(cred_jar, GFP_KERNEL);  in cred_alloc_blank()
178 	if (!new)  in cred_alloc_blank()
181 	atomic_long_set(&new->usage, 1);  in cred_alloc_blank()
182 	if (security_cred_alloc_blank(new, GFP_KERNEL_ACCOUNT) < 0)  in cred_alloc_blank()
185 	return new;  in cred_alloc_blank()
188 	abort_creds(new);  in cred_alloc_blank()
193  * prepare_creds - Prepare a new set of credentials for modification
195  * Prepare a new set of task credentials for modification.  A task's creds
197  * prepare a new copy, which the caller then modifies and then commits by
202  * Returns a pointer to the new creds-to-be if successful, NULL otherwise.
210 	struct cred *new;  in prepare_creds()  local
212 	new = kmem_cache_alloc(cred_jar, GFP_KERNEL);  in prepare_creds()
213 	if (!new)  in prepare_creds()
216 	kdebug("prepare_creds() alloc %p", new);  in prepare_creds()
219 	memcpy(new, old, sizeof(struct cred));  in prepare_creds()
221 	new->non_rcu = 0;  in prepare_creds()
222 	atomic_long_set(&new->usage, 1);  in prepare_creds()
223 	get_group_info(new->group_info);  in prepare_creds()
224 	get_uid(new->user);  in prepare_creds()
225 	get_user_ns(new->user_ns);  in prepare_creds()
228 	key_get(new->session_keyring);  in prepare_creds()
229 	key_get(new->process_keyring);  in prepare_creds()
230 	key_get(new->thread_keyring);  in prepare_creds()
231 	key_get(new->request_key_auth);  in prepare_creds()
235 	new->security = NULL;  in prepare_creds()
238 	new->ucounts = get_ucounts(new->ucounts);  in prepare_creds()
239 	if (!new->ucounts)  in prepare_creds()
242 	if (security_prepare_creds(new, old, GFP_KERNEL_ACCOUNT) < 0)  in prepare_creds()
245 	return new;  in prepare_creds()
248 	abort_creds(new);  in prepare_creds()
259 	struct cred *new;  in prepare_exec_creds()  local
261 	new = prepare_creds();  in prepare_exec_creds()
262 	if (!new)  in prepare_exec_creds()
263 		return new;  in prepare_exec_creds()
267 	key_put(new->thread_keyring);  in prepare_exec_creds()
268 	new->thread_keyring = NULL;  in prepare_exec_creds()
270 	/* inherit the session keyring; new process keyring */  in prepare_exec_creds()
271 	key_put(new->process_keyring);  in prepare_exec_creds()
272 	new->process_keyring = NULL;  in prepare_exec_creds()
275 	new->suid = new->fsuid = new->euid;  in prepare_exec_creds()
276 	new->sgid = new->fsgid = new->egid;  in prepare_exec_creds()
278 	return new;  in prepare_exec_creds()
282  * Copy credentials for the new process created by fork()
284  * We share if we can, but under some circumstances we have to generate a new
287  * The new process gets the current process's subjective credentials as its
292 	struct cred *new;  in copy_creds()  local
312 	new = prepare_creds();  in copy_creds()
313 	if (!new)  in copy_creds()
317 		ret = create_user_ns(new);  in copy_creds()
320 		ret = set_cred_ucounts(new);  in copy_creds()
326 	/* new threads get their own thread keyrings if their parent already  in copy_creds()
328 	if (new->thread_keyring) {  in copy_creds()
329 		key_put(new->thread_keyring);  in copy_creds()
330 		new->thread_keyring = NULL;  in copy_creds()
332 			install_thread_keyring_to_cred(new);  in copy_creds()
339 		key_put(new->process_keyring);  in copy_creds()
340 		new->process_keyring = NULL;  in copy_creds()
344 	p->cred = p->real_cred = get_cred(new);  in copy_creds()
349 	put_cred(new);  in copy_creds()
379  * commit_creds - Install new credentials upon the current task
380  * @new: The credentials to be assigned
382  * Install a new set of credentials to the current task, using RCU to replace
387  * This function eats the caller's reference to the new credentials.
392 int commit_creds(struct cred *new)  in commit_creds()  argument
397 	kdebug("commit_creds(%p{%ld})", new,  in commit_creds()
398 	       atomic_long_read(&new->usage));  in commit_creds()
401 	BUG_ON(atomic_long_read(&new->usage) < 1);  in commit_creds()
403 	get_cred(new); /* we will require a ref for the subj creds too */  in commit_creds()
406 	if (!uid_eq(old->euid, new->euid) ||  in commit_creds()
407 	    !gid_eq(old->egid, new->egid) ||  in commit_creds()
408 	    !uid_eq(old->fsuid, new->fsuid) ||  in commit_creds()
409 	    !gid_eq(old->fsgid, new->fsgid) ||  in commit_creds()
410 	    !cred_cap_issubset(old, new)) {  in commit_creds()
427 	if (!uid_eq(new->fsuid, old->fsuid))  in commit_creds()
428 		key_fsuid_changed(new);  in commit_creds()
429 	if (!gid_eq(new->fsgid, old->fsgid))  in commit_creds()
430 		key_fsgid_changed(new);  in commit_creds()
436 	if (new->user != old->user || new->user_ns != old->user_ns)  in commit_creds()
437 		inc_rlimit_ucounts(new->ucounts, UCOUNT_RLIMIT_NPROC, 1);  in commit_creds()
438 	rcu_assign_pointer(task->real_cred, new);  in commit_creds()
439 	rcu_assign_pointer(task->cred, new);  in commit_creds()
440 	if (new->user != old->user || new->user_ns != old->user_ns)  in commit_creds()
444 	if (!uid_eq(new->uid,   old->uid)  ||  in commit_creds()
445 	    !uid_eq(new->euid,  old->euid) ||  in commit_creds()
446 	    !uid_eq(new->suid,  old->suid) ||  in commit_creds()
447 	    !uid_eq(new->fsuid, old->fsuid))  in commit_creds()
450 	if (!gid_eq(new->gid,   old->gid)  ||  in commit_creds()
451 	    !gid_eq(new->egid,  old->egid) ||  in commit_creds()
452 	    !gid_eq(new->sgid,  old->sgid) ||  in commit_creds()
453 	    !gid_eq(new->fsgid, old->fsgid))  in commit_creds()
464  * @new: The credentials that were going to be applied
469 void abort_creds(struct cred *new)  in abort_creds()  argument
471 	kdebug("abort_creds(%p{%ld})", new,  in abort_creds()
472 	       atomic_long_read(&new->usage));  in abort_creds()
474 	BUG_ON(atomic_long_read(&new->usage) < 1);  in abort_creds()
475 	put_cred(new);  in abort_creds()
533 int set_cred_ucounts(struct cred *new)  in set_cred_ucounts()  argument
535 	struct ucounts *new_ucounts, *old_ucounts = new->ucounts;  in set_cred_ucounts()
541 	if (old_ucounts->ns == new->user_ns && uid_eq(old_ucounts->uid, new->uid))  in set_cred_ucounts()
544 	if (!(new_ucounts = alloc_ucounts(new->user_ns, new->uid)))  in set_cred_ucounts()
547 	new->ucounts = new_ucounts;  in set_cred_ucounts()
577  * Returns the new credentials or NULL if out of memory.
582 	struct cred *new;  in prepare_kernel_cred()  local
587 	new = kmem_cache_alloc(cred_jar, GFP_KERNEL);  in prepare_kernel_cred()
588 	if (!new)  in prepare_kernel_cred()
591 	kdebug("prepare_kernel_cred() alloc %p", new);  in prepare_kernel_cred()
595 	*new = *old;  in prepare_kernel_cred()
596 	new->non_rcu = 0;  in prepare_kernel_cred()
597 	atomic_long_set(&new->usage, 1);  in prepare_kernel_cred()
598 	get_uid(new->user);  in prepare_kernel_cred()
599 	get_user_ns(new->user_ns);  in prepare_kernel_cred()
600 	get_group_info(new->group_info);  in prepare_kernel_cred()
603 	new->session_keyring = NULL;  in prepare_kernel_cred()
604 	new->process_keyring = NULL;  in prepare_kernel_cred()
605 	new->thread_keyring = NULL;  in prepare_kernel_cred()
606 	new->request_key_auth = NULL;  in prepare_kernel_cred()
607 	new->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING;  in prepare_kernel_cred()
611 	new->security = NULL;  in prepare_kernel_cred()
613 	new->ucounts = get_ucounts(new->ucounts);  in prepare_kernel_cred()
614 	if (!new->ucounts)  in prepare_kernel_cred()
617 	if (security_prepare_creds(new, old, GFP_KERNEL_ACCOUNT) < 0)  in prepare_kernel_cred()
621 	return new;  in prepare_kernel_cred()
624 	put_cred(new);  in prepare_kernel_cred()
632  * @new: The credentials to alter
638 int set_security_override(struct cred *new, u32 secid)  in set_security_override()  argument
640 	return security_kernel_act_as(new, secid);  in set_security_override()
646  * @new: The credentials to alter
654 int set_security_override_from_ctx(struct cred *new, const char *secctx)  in set_security_override_from_ctx()  argument
663 	return set_security_override(new, secid);  in set_security_override_from_ctx()
669  * @new: The credentials to alter
673  * as the object context of the specified inode, so that the new inodes have
676 int set_create_files_as(struct cred *new, struct inode *inode)  in set_create_files_as()  argument
680 	new->fsuid = inode->i_uid;  in set_create_files_as()
681 	new->fsgid = inode->i_gid;  in set_create_files_as()
682 	return security_kernel_create_files_as(new, inode);  in set_create_files_as()