18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0+ 28c2ecf20Sopenharmony_ci/* 38c2ecf20Sopenharmony_ci * Copyright (c) 2020 Bernd Edlinger <bernd.edlinger@hotmail.de> 48c2ecf20Sopenharmony_ci * All rights reserved. 58c2ecf20Sopenharmony_ci * 68c2ecf20Sopenharmony_ci * Check whether /proc/$pid/mem can be accessed without causing deadlocks 78c2ecf20Sopenharmony_ci * when de_thread is blocked with ->cred_guard_mutex held. 88c2ecf20Sopenharmony_ci */ 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_ci#include "../kselftest_harness.h" 118c2ecf20Sopenharmony_ci#include <stdio.h> 128c2ecf20Sopenharmony_ci#include <fcntl.h> 138c2ecf20Sopenharmony_ci#include <pthread.h> 148c2ecf20Sopenharmony_ci#include <signal.h> 158c2ecf20Sopenharmony_ci#include <unistd.h> 168c2ecf20Sopenharmony_ci#include <sys/ptrace.h> 178c2ecf20Sopenharmony_ci 188c2ecf20Sopenharmony_cistatic void *thread(void *arg) 198c2ecf20Sopenharmony_ci{ 208c2ecf20Sopenharmony_ci ptrace(PTRACE_TRACEME, 0, 0L, 0L); 218c2ecf20Sopenharmony_ci return NULL; 228c2ecf20Sopenharmony_ci} 238c2ecf20Sopenharmony_ci 248c2ecf20Sopenharmony_ciTEST(vmaccess) 258c2ecf20Sopenharmony_ci{ 268c2ecf20Sopenharmony_ci int f, pid = fork(); 278c2ecf20Sopenharmony_ci char mm[64]; 288c2ecf20Sopenharmony_ci 298c2ecf20Sopenharmony_ci if (!pid) { 308c2ecf20Sopenharmony_ci pthread_t pt; 318c2ecf20Sopenharmony_ci 328c2ecf20Sopenharmony_ci pthread_create(&pt, NULL, thread, NULL); 338c2ecf20Sopenharmony_ci pthread_join(pt, NULL); 348c2ecf20Sopenharmony_ci execlp("true", "true", NULL); 358c2ecf20Sopenharmony_ci } 368c2ecf20Sopenharmony_ci 378c2ecf20Sopenharmony_ci sleep(1); 388c2ecf20Sopenharmony_ci sprintf(mm, "/proc/%d/mem", pid); 398c2ecf20Sopenharmony_ci f = open(mm, O_RDONLY); 408c2ecf20Sopenharmony_ci ASSERT_GE(f, 0); 418c2ecf20Sopenharmony_ci close(f); 428c2ecf20Sopenharmony_ci f = kill(pid, SIGCONT); 438c2ecf20Sopenharmony_ci ASSERT_EQ(f, 0); 448c2ecf20Sopenharmony_ci} 458c2ecf20Sopenharmony_ci 468c2ecf20Sopenharmony_ciTEST(attach) 478c2ecf20Sopenharmony_ci{ 488c2ecf20Sopenharmony_ci int s, k, pid = fork(); 498c2ecf20Sopenharmony_ci 508c2ecf20Sopenharmony_ci if (!pid) { 518c2ecf20Sopenharmony_ci pthread_t pt; 528c2ecf20Sopenharmony_ci 538c2ecf20Sopenharmony_ci pthread_create(&pt, NULL, thread, NULL); 548c2ecf20Sopenharmony_ci pthread_join(pt, NULL); 558c2ecf20Sopenharmony_ci execlp("sleep", "sleep", "2", NULL); 568c2ecf20Sopenharmony_ci } 578c2ecf20Sopenharmony_ci 588c2ecf20Sopenharmony_ci sleep(1); 598c2ecf20Sopenharmony_ci k = ptrace(PTRACE_ATTACH, pid, 0L, 0L); 608c2ecf20Sopenharmony_ci ASSERT_EQ(errno, EAGAIN); 618c2ecf20Sopenharmony_ci ASSERT_EQ(k, -1); 628c2ecf20Sopenharmony_ci k = waitpid(-1, &s, WNOHANG); 638c2ecf20Sopenharmony_ci ASSERT_NE(k, -1); 648c2ecf20Sopenharmony_ci ASSERT_NE(k, 0); 658c2ecf20Sopenharmony_ci ASSERT_NE(k, pid); 668c2ecf20Sopenharmony_ci ASSERT_EQ(WIFEXITED(s), 1); 678c2ecf20Sopenharmony_ci ASSERT_EQ(WEXITSTATUS(s), 0); 688c2ecf20Sopenharmony_ci sleep(1); 698c2ecf20Sopenharmony_ci k = ptrace(PTRACE_ATTACH, pid, 0L, 0L); 708c2ecf20Sopenharmony_ci ASSERT_EQ(k, 0); 718c2ecf20Sopenharmony_ci k = waitpid(-1, &s, 0); 728c2ecf20Sopenharmony_ci ASSERT_EQ(k, pid); 738c2ecf20Sopenharmony_ci ASSERT_EQ(WIFSTOPPED(s), 1); 748c2ecf20Sopenharmony_ci ASSERT_EQ(WSTOPSIG(s), SIGSTOP); 758c2ecf20Sopenharmony_ci k = ptrace(PTRACE_DETACH, pid, 0L, 0L); 768c2ecf20Sopenharmony_ci ASSERT_EQ(k, 0); 778c2ecf20Sopenharmony_ci k = waitpid(-1, &s, 0); 788c2ecf20Sopenharmony_ci ASSERT_EQ(k, pid); 798c2ecf20Sopenharmony_ci ASSERT_EQ(WIFEXITED(s), 1); 808c2ecf20Sopenharmony_ci ASSERT_EQ(WEXITSTATUS(s), 0); 818c2ecf20Sopenharmony_ci k = waitpid(-1, NULL, 0); 828c2ecf20Sopenharmony_ci ASSERT_EQ(k, -1); 838c2ecf20Sopenharmony_ci ASSERT_EQ(errno, ECHILD); 848c2ecf20Sopenharmony_ci} 858c2ecf20Sopenharmony_ci 868c2ecf20Sopenharmony_ciTEST_HARNESS_MAIN 87