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      1 /*	$NetBSD: t_ptrace_kill.c,v 1.2 2025/05/02 02:24:32 riastradh Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2024 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Christos Zoulas.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __RCSID("$NetBSD: t_ptrace_kill.c,v 1.2 2025/05/02 02:24:32 riastradh Exp $");
     34 
     35 #include <sys/types.h>
     36 #include <sys/ptrace.h>
     37 #include <sys/wait.h>
     38 #include <pthread.h>
     39 #include <stdio.h>
     40 #include <stdlib.h>
     41 #include <string.h>
     42 #include <signal.h>
     43 #include <unistd.h>
     44 #include <errno.h>
     45 #include <err.h>
     46 #include <atf-c.h>
     47 
     48 #define SYSCALL(a, b) ATF_REQUIRE_EQ_MSG(a, b, "%s got %s", #a, strerror(errno))
     49 
     50 ATF_TC(pt_kill);
     51 ATF_TC_HEAD(pt_kill, tc)
     52 {
     53 	atf_tc_set_md_var(tc, "descr", "Test PT_KILL of a PT_STOP'ed process");
     54 }
     55 
     56 static void
     57 child(int *fdto, int *fdfrom)
     58 {
     59 	char p = '2', q;
     60 	printf("%d: born\n", getpid());
     61 	write(fdfrom[1], &p, 1);
     62 	read(fdto[0], &q, 1);
     63 	printf("%d: seppuku %c\n", getpid(), q);
     64 	write(fdfrom[1], &p, 1);
     65 	read(fdto[0], &q, 1);
     66 //	*(int *)1 = 0;
     67 //	kill(getpid(), SIGSEGV);
     68 //	kill(getpid(), SIGSTOP);
     69 	for (;;)
     70 		sleep(1);
     71 
     72 }
     73 
     74 static void *
     75 waitthread(void *pidp)
     76 {
     77 	int status = 0;
     78 	pid_t rpid, pid;
     79 
     80 	pid = *(pid_t *)pidp;
     81 	printf("waiting for %d\n", pid);
     82 	while ((rpid = waitpid(pid, &status, 0)) != pid) {
     83 		printf("waitpid %d = %d status = %#x", pid, rpid, status);
     84 	}
     85 	printf("done waitpid %d = %d status = %#x", pid, rpid, status);
     86 	return NULL;
     87 }
     88 
     89 ATF_TC_BODY(pt_kill, tc)
     90 {
     91 	pid_t pid;
     92 	int fdto[2], fdfrom[2];
     93 	char p = '1', q;
     94 	int status;
     95 	pthread_t thread;
     96 
     97 	SYSCALL(pipe(fdto), 0);
     98 	SYSCALL(pipe(fdfrom), 0);
     99 	switch (pid = fork()) {
    100 	case 0:
    101 		child(fdto, fdfrom);
    102 		break;
    103 	case -1:
    104 		err(EXIT_FAILURE, "fork failed");
    105 	default:
    106 		SYSCALL(pthread_create(&thread, NULL, waitthread, &pid), 0);
    107 		sleep(1); // XXX: too lazy to sync properly
    108 		SYSCALL(read(fdfrom[0], &q, 1), 1);
    109 		printf("%d: read %c\n", pid, q);
    110 		SYSCALL(ptrace(PT_ATTACH, pid, NULL, 0), 0);
    111 		printf("%d: attached\n", pid);
    112 		SYSCALL(write(fdto[1], &p, 1), 1);
    113 		waitpid(pid, NULL, WNOHANG);
    114 		printf("%d: sent\n", pid);
    115 		SYSCALL(ptrace(PT_CONTINUE, pid, (void *)1, 0), 0);
    116 		SYSCALL(read(fdfrom[0], &p, 1), 1);
    117 		printf("%d: received\n", pid);
    118 		SYSCALL(ptrace(PT_STOP, pid, NULL, 0), 0);
    119 		SYSCALL(ptrace(PT_KILL, pid, NULL, 0), 0);
    120 		SYSCALL(waitpid(pid, &status, 0), pid);
    121 		ATF_REQUIRE(status == 9);
    122 		break;
    123 	}
    124 }
    125 
    126 ATF_TP_ADD_TCS(tp)
    127 {
    128 	ATF_TP_ADD_TC(tp, pt_kill);
    129 
    130 	return atf_no_error();
    131 }
    132