[src/trunk]: src/tests/lib/libc/sys Add a new ATF ptrace(2) test: traceme_vfo...

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

details:   https://anonhg.NetBSD.org/src/rev/0351720aee41
branches:  trunk
changeset: 322753:0351720aee41
user:      kamil <kamil%NetBSD.org@localhost>
date:      Wed May 16 01:27:27 2018 +0000

description:
Add a new ATF ptrace(2) test: traceme_vfork_breakpoint

Verify software breakpoint in a vfork(2)ed child.

The expected behavior is not to route this signal to the parent, even if
that parent is a tracer. The parent cannot handle it and it would lead to
the deadlock.

This test passes correctly.

Sponsored by <The NetBSD Foundation>

diffstat:

 tests/lib/libc/sys/t_ptrace_wait.c |  49 ++++++++++++++++++++++++++++++++++++-
 1 files changed, 47 insertions(+), 2 deletions(-)

diffs (77 lines):

diff -r 31a693fe515b -r 0351720aee41 tests/lib/libc/sys/t_ptrace_wait.c
--- a/tests/lib/libc/sys/t_ptrace_wait.c        Wed May 16 00:42:15 2018 +0000
+++ b/tests/lib/libc/sys/t_ptrace_wait.c        Wed May 16 01:27:27 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: t_ptrace_wait.c,v 1.40 2018/05/16 00:42:15 kamil Exp $ */
+/*     $NetBSD: t_ptrace_wait.c,v 1.41 2018/05/16 01:27:27 kamil Exp $ */
 
 /*-
  * Copyright (c) 2016 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: t_ptrace_wait.c,v 1.40 2018/05/16 00:42:15 kamil Exp $");
+__RCSID("$NetBSD: t_ptrace_wait.c,v 1.41 2018/05/16 01:27:27 kamil Exp $");
 
 #include <sys/param.h>
 #include <sys/types.h>
@@ -456,6 +456,49 @@
 
 /// ----------------------------------------------------------------------------
 
+ATF_TC(traceme_vfork_breakpoint);
+ATF_TC_HEAD(traceme_vfork_breakpoint, tc)
+{
+       atf_tc_set_md_var(tc, "descr",
+           "Verify software breakpoint in a vfork(2)ed child");
+}
+
+ATF_TC_BODY(traceme_vfork_breakpoint, tc)
+{
+       pid_t child, wpid;
+#if defined(TWAIT_HAVE_STATUS)
+       int status;
+#endif
+
+       DPRINTF("Before forking process PID=%d\n", getpid());
+       SYSCALL_REQUIRE((child = vfork()) != -1);
+       if (child == 0) {
+               DPRINTF("Before calling PT_TRACE_ME from child %d\n", getpid());
+               FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);
+
+               DPRINTF("Before executing a software breakpoint\n");
+#ifdef PTRACE_BREAKPOINT_ASM
+               PTRACE_BREAKPOINT_ASM;
+#else
+               /* port me */
+#endif
+
+               /* NOTREACHED */
+               FORKEE_ASSERTX(0 && "This shall not be reached");
+       }
+       DPRINTF("Parent process PID=%d, child's PID=%d\n", getpid(), child);
+
+       DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+       validate_status_signaled(status, SIGTRAP, 1);
+
+       DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
+}
+
+/// ----------------------------------------------------------------------------
+
 #if defined(TWAIT_HAVE_PID)
 ATF_TC(attach1);
 ATF_TC_HEAD(attach1, tc)
@@ -6923,6 +6966,8 @@
        ATF_TP_ADD_TC(tp, traceme_vfork_raise4);
        ATF_TP_ADD_TC(tp, traceme_vfork_raise5);
 
+       ATF_TP_ADD_TC(tp, traceme_vfork_breakpoint);
+
        ATF_TP_ADD_TC_HAVE_PID(tp, attach1);
        ATF_TP_ADD_TC_HAVE_PID(tp, attach2);
        ATF_TP_ADD_TC(tp, attach3);