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      1 /*	$NetBSD: t_ptrace_misc_wait.h,v 1.1 2020/05/05 02:06:08 kamil Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2016, 2017, 2018, 2019, 2020 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 static void
     30 user_va0_disable(int operation)
     31 {
     32 	pid_t child, wpid;
     33 #if defined(TWAIT_HAVE_STATUS)
     34 	int status;
     35 #endif
     36 	const int sigval = SIGSTOP;
     37 	int rv;
     38 
     39 	struct ptrace_siginfo info;
     40 
     41 	if (get_user_va0_disable() == 0)
     42 		atf_tc_skip("vm.user_va0_disable is set to 0");
     43 
     44 	memset(&info, 0, sizeof(info));
     45 
     46 	DPRINTF("Before forking process PID=%d\n", getpid());
     47 	SYSCALL_REQUIRE((child = fork()) != -1);
     48 	if (child == 0) {
     49 		DPRINTF("Before calling PT_TRACE_ME from child %d\n", getpid());
     50 		FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);
     51 
     52 		DPRINTF("Before raising %s from child\n", strsignal(sigval));
     53 		FORKEE_ASSERT(raise(sigval) == 0);
     54 
     55 		/* NOTREACHED */
     56 		FORKEE_ASSERTX(0 && "This shall not be reached");
     57 		__unreachable();
     58 	}
     59 	DPRINTF("Parent process PID=%d, child's PID=%d\n", getpid(), child);
     60 
     61 	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
     62 	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
     63 
     64 	validate_status_stopped(status, sigval);
     65 
     66 	DPRINTF("Before calling ptrace(2) with PT_GET_SIGINFO for "
     67 		"child\n");
     68 	SYSCALL_REQUIRE(ptrace(PT_GET_SIGINFO, child, &info,
     69 		sizeof(info)) != -1);
     70 
     71 	DPRINTF("Signal traced to lwpid=%d\n", info.psi_lwpid);
     72 	DPRINTF("Signal properties: si_signo=%#x si_code=%#x "
     73 		"si_errno=%#x\n",
     74 		info.psi_siginfo.si_signo, info.psi_siginfo.si_code,
     75 		info.psi_siginfo.si_errno);
     76 
     77 	ATF_REQUIRE_EQ(info.psi_siginfo.si_signo, sigval);
     78 	ATF_REQUIRE_EQ(info.psi_siginfo.si_code, SI_LWP);
     79 
     80 	DPRINTF("Before resuming the child process in PC=0x0 "
     81 	    "and without signal to be sent\n");
     82 	errno = 0;
     83 	rv = ptrace(operation, child, (void *)0, 0);
     84 	ATF_REQUIRE_EQ(errno, EINVAL);
     85 	ATF_REQUIRE_EQ(rv, -1);
     86 
     87 	SYSCALL_REQUIRE(ptrace(PT_KILL, child, NULL, 0) != -1);
     88 
     89 	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
     90 	TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
     91 	validate_status_signaled(status, SIGKILL, 0);
     92 
     93 	DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
     94 	TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
     95 }
     96 
     97 #define USER_VA0_DISABLE(test, operation)				\
     98 ATF_TC(test);								\
     99 ATF_TC_HEAD(test, tc)							\
    100 {									\
    101 	atf_tc_set_md_var(tc, "descr",					\
    102 	    "Verify behavior of " #operation " with PC set to 0x0");	\
    103 }									\
    104 									\
    105 ATF_TC_BODY(test, tc)							\
    106 {									\
    107 									\
    108 	user_va0_disable(operation);					\
    109 }
    110 
    111 USER_VA0_DISABLE(user_va0_disable_pt_continue, PT_CONTINUE)
    112 USER_VA0_DISABLE(user_va0_disable_pt_syscall, PT_SYSCALL)
    113 USER_VA0_DISABLE(user_va0_disable_pt_detach, PT_DETACH)
    114 
    115 #define ATF_TP_ADD_TCS_PTRACE_WAIT_MISC() \
    116 	ATF_TP_ADD_TC(tp, user_va0_disable_pt_continue); \
    117 	ATF_TP_ADD_TC(tp, user_va0_disable_pt_syscall); \
    118 	ATF_TP_ADD_TC(tp, user_va0_disable_pt_detach);
    119