Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Copyright (c) 2020 Bernd Edlinger <bernd.edlinger@hotmail.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Check whether /proc/$pid/mem can be accessed without causing deadlocks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * when de_thread is blocked with ->cred_guard_mutex held.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include "../kselftest_harness.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <pthread.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <sys/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static void *thread(void *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	ptrace(PTRACE_TRACEME, 0, 0L, 0L);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) TEST(vmaccess)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	int f, pid = fork();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	char mm[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	if (!pid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 		pthread_t pt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 		pthread_create(&pt, NULL, thread, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 		pthread_join(pt, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		execlp("true", "true", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	sleep(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	sprintf(mm, "/proc/%d/mem", pid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	f = open(mm, O_RDONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	ASSERT_GE(f, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	close(f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	f = kill(pid, SIGCONT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 	ASSERT_EQ(f, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) TEST(attach)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	int s, k, pid = fork();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	if (!pid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 		pthread_t pt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 		pthread_create(&pt, NULL, thread, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 		pthread_join(pt, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		execlp("sleep", "sleep", "2", NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	sleep(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	k = ptrace(PTRACE_ATTACH, pid, 0L, 0L);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	ASSERT_EQ(errno, EAGAIN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	ASSERT_EQ(k, -1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	k = waitpid(-1, &s, WNOHANG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	ASSERT_NE(k, -1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	ASSERT_NE(k, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	ASSERT_NE(k, pid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	ASSERT_EQ(WIFEXITED(s), 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	ASSERT_EQ(WEXITSTATUS(s), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 	sleep(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	k = ptrace(PTRACE_ATTACH, pid, 0L, 0L);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	ASSERT_EQ(k, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	k = waitpid(-1, &s, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	ASSERT_EQ(k, pid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 	ASSERT_EQ(WIFSTOPPED(s), 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	ASSERT_EQ(WSTOPSIG(s), SIGSTOP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	k = ptrace(PTRACE_DETACH, pid, 0L, 0L);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 	ASSERT_EQ(k, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 	k = waitpid(-1, &s, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 	ASSERT_EQ(k, pid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 	ASSERT_EQ(WIFEXITED(s), 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	ASSERT_EQ(WEXITSTATUS(s), 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 	k = waitpid(-1, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 	ASSERT_EQ(k, -1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 	ASSERT_EQ(errno, ECHILD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) TEST_HARNESS_MAIN