1 // SPDX-License-Identifier: GPL-2.0
23  * We don't expose the real in-memory order of objects for security reasons.
27  * The obfuscation is done in two steps. First we xor the kernel pointer with
29  * Secondly we multiply the xor production with a large odd random number to
45  * 0 - equal, i.e. v1 = v2
46  * 1 - less than, i.e. v1 < v2
47  * 2 - greater than, i.e. v1 > v2
48  * 3 - not equal but ordering unavailable (reserved for future)
50 static int kcmp_ptr(void *v1, void *v2, enum kcmp_type type)  in kcmp_ptr()  argument
55 	t2 = kptr_obfuscate((long)v2, type);  in kcmp_ptr()
109 		return -EFAULT;  in kcmp_epoll_target()
113 		return -EBADF;  in kcmp_epoll_target()
117 		return -EBADF;  in kcmp_epoll_target()
133 	return -EOPNOTSUPP;  in kcmp_epoll_target()
161 	ret = kcmp_lock(&task1->signal->exec_update_lock,  in SYSCALL_DEFINE5()
162 			&task2->signal->exec_update_lock);  in SYSCALL_DEFINE5()
167 		ret = -EPERM;  in SYSCALL_DEFINE5()
181 			ret = -EBADF;  in SYSCALL_DEFINE5()
185 		ret = kcmp_ptr(task1->mm, task2->mm, KCMP_VM);  in SYSCALL_DEFINE5()
188 		ret = kcmp_ptr(task1->files, task2->files, KCMP_FILES);  in SYSCALL_DEFINE5()
191 		ret = kcmp_ptr(task1->fs, task2->fs, KCMP_FS);  in SYSCALL_DEFINE5()
194 		ret = kcmp_ptr(task1->sighand, task2->sighand, KCMP_SIGHAND);  in SYSCALL_DEFINE5()
197 		ret = kcmp_ptr(task1->io_context, task2->io_context, KCMP_IO);  in SYSCALL_DEFINE5()
201 		ret = kcmp_ptr(task1->sysvsem.undo_list,  in SYSCALL_DEFINE5()
202 			       task2->sysvsem.undo_list,  in SYSCALL_DEFINE5()
205 		ret = -EOPNOTSUPP;  in SYSCALL_DEFINE5()
212 		ret = -EINVAL;  in SYSCALL_DEFINE5()
217 	kcmp_unlock(&task1->signal->exec_update_lock,  in SYSCALL_DEFINE5()
218 		    &task2->signal->exec_update_lock);  in SYSCALL_DEFINE5()
227 	return -ESRCH;  in SYSCALL_DEFINE5()