[src/trunk]: src/tests/kernel Add new test syscallemu1 in t_ptrace_wait*

[kamil <kamil%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/66414af8a782
branches:  trunk
changeset: 822079:66414af8a782
user:      kamil <kamil%NetBSD.org@localhost>
date:      Tue Feb 28 13:19:50 2017 +0000

description:
Add new test syscallemu1 in t_ptrace_wait*

syscallemu1:
    Verify that exit(2) can be intercepted with PT_SYSCALLEMU

This test is failing as PT_SYSCALL does not stop the process on syscall
entry. This renders PT_SYSCALL broken on NetBSD.

Sponsored by <The NetBSD Foundation>

diffstat:

 tests/kernel/t_ptrace_wait.c |  77 ++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 75 insertions(+), 2 deletions(-)

diffs (104 lines):

diff -r 9a61cfa22261 -r 66414af8a782 tests/kernel/t_ptrace_wait.c
--- a/tests/kernel/t_ptrace_wait.c      Tue Feb 28 13:10:54 2017 +0000
+++ b/tests/kernel/t_ptrace_wait.c      Tue Feb 28 13:19:50 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: t_ptrace_wait.c,v 1.73 2017/02/24 06:17:48 kamil Exp $ */
+/*     $NetBSD: t_ptrace_wait.c,v 1.74 2017/02/28 13:19:50 kamil Exp $ */
 
 /*-
  * Copyright (c) 2016 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: t_ptrace_wait.c,v 1.73 2017/02/24 06:17:48 kamil Exp $");
+__RCSID("$NetBSD: t_ptrace_wait.c,v 1.74 2017/02/28 13:19:50 kamil Exp $");
 
 #include <sys/param.h>
 #include <sys/types.h>
@@ -7470,6 +7470,77 @@
        TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
 }
 
+ATF_TC(syscallemu1);
+ATF_TC_HEAD(syscallemu1, tc)
+{
+       atf_tc_set_md_var(tc, "descr",
+           "Verify that exit(2) can be intercepted with PT_SYSCALLEMU");
+}
+
+ATF_TC_BODY(syscallemu1, tc)
+{
+       const int exitval = 5;
+       const int sigval = SIGSTOP;
+       pid_t child, wpid;
+#if defined(TWAIT_HAVE_STATUS)
+       int status;
+#endif
+
+       printf("Before forking process PID=%d\n", getpid());
+       ATF_REQUIRE((child = fork()) != -1);
+       if (child == 0) {
+               printf("Before calling PT_TRACE_ME from child %d\n", getpid());
+               FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);
+
+               printf("Before raising %s from child\n", strsignal(sigval));
+               FORKEE_ASSERT(raise(sigval) == 0);
+
+               syscall(SYS_exit, 100);
+
+               printf("Before exiting of the child process\n");
+               _exit(exitval);
+       }
+       printf("Parent process PID=%d, child's PID=%d\n", getpid(), child);
+
+       printf("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+       validate_status_stopped(status, sigval);
+
+       printf("Before resuming the child process where it left off and "
+           "without signal to be sent\n");
+       ATF_REQUIRE(ptrace(PT_SYSCALL, child, (void *)1, 0) != -1);
+
+       printf("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+       validate_status_stopped(status, SIGTRAP);
+
+       printf("Set SYSCALLEMU for intercepted syscall\n");
+       ATF_REQUIRE(ptrace(PT_SYSCALLEMU, child, (void *)1, 0) != -1);
+
+       printf("Before resuming the child process where it left off and "
+           "without signal to be sent\n");
+       ATF_REQUIRE(ptrace(PT_SYSCALL, child, (void *)1, 0) != -1);
+
+       printf("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+       validate_status_stopped(status, SIGTRAP);
+
+       printf("Before resuming the child process where it left off and "
+           "without signal to be sent\n");
+       ATF_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
+
+       printf("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+       validate_status_exited(status, exitval);
+
+       printf("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
+}
+
 ATF_TP_ADD_TCS(tp)
 {
        setvbuf(stdout, NULL, _IONBF, 0);
@@ -7600,5 +7671,7 @@
 
        ATF_TP_ADD_TC(tp, syscall1);
 
+       ATF_TP_ADD_TC(tp, syscallemu1);
+
        return atf_no_error();
 }