selftests/landlock/ptrace_test.c

100  * Test multiple tracing combinations between a parent process P1 and a child
157  *        Parent + child domain (siblings)
191  *         Inherited + child domain
227  *         Inherited + parent and child domain (siblings)
254 /* Test PTRACE_TRACEME and PTRACE_ATTACH for parent and child. */
257 	pid_t child, parent;
273 	 * can_read_child is true if a parent process can read its child
275 	 * isolated from the child with a dedicated Landlock domain.
280 	 * can_trace_child is true if a parent process can trace its child
282 	 * - The parent process is not isolated from the child with a dedicated
290 	 * can_read_parent is true if a child process can read its parent
291 	 * process, which is only the case when the child process is not
297 	 * can_trace_parent is true if a child process can trace its parent
299 	 * - The child process is not isolated from the parent with a dedicated
322 	child = fork();
323 	ASSERT_LE(0, child);
324 	if (child == 0) {
357 		/* Tests child PTRACE_TRACEME. */
391 	 * Waits for the child to test PTRACE_ATTACH on the parent and start
396 	/* Tests child PTRACE_TRACEME. */
398 		ASSERT_EQ(child, waitpid(child, &status, 0));
400 		ASSERT_EQ(0, ptrace(PTRACE_DETACH, child, NULL, 0));
402 		/* The child should not be traced by the parent. */
403 		EXPECT_EQ(-1, ptrace(PTRACE_DETACH, child, NULL, 0));
407 	/* Tests PTRACE_MODE_READ on the child. */
408 	err_proc_read = test_ptrace_read(child);
415 	/* Tests PTRACE_ATTACH on the child. */
416 	ret = ptrace(PTRACE_ATTACH, child, NULL, 0);
425 		ASSERT_EQ(child, waitpid(child, &status, 0));
427 		ASSERT_EQ(0, ptrace(PTRACE_DETACH, child, NULL, 0));
432 	ASSERT_EQ(child, waitpid(child, &status, 0));