[src/trunk]: src/tests/lib/libc/sys Add two new ptrace(2) ATF tests

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

details:   https://anonhg.NetBSD.org/src/rev/a9634e97a51f
branches:  trunk
changeset: 322329:a9634e97a51f
user:      kamil <kamil%NetBSD.org@localhost>
date:      Sun Apr 29 13:56:00 2018 +0000

description:
Add two new ptrace(2) ATF tests

Added:

 - traceme_pid1_parent
   Assert that a process cannot mark its parent a debugger twice

 - traceme_twice
   Verify that PT_TRACE_ME is not allowed when our parent is PID1

All tests pass.

Sponsored by <The NetBSD Foundation>

diffstat:

 tests/lib/libc/sys/t_ptrace.c      |  24 ++++++++++++-
 tests/lib/libc/sys/t_ptrace_wait.c |  65 ++++++++++++++++++++++++++++++++++++-
 2 files changed, 85 insertions(+), 4 deletions(-)

diffs (145 lines):

diff -r eb20f98c6263 -r a9634e97a51f tests/lib/libc/sys/t_ptrace.c
--- a/tests/lib/libc/sys/t_ptrace.c     Sun Apr 29 12:12:42 2018 +0000
+++ b/tests/lib/libc/sys/t_ptrace.c     Sun Apr 29 13:56:00 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: t_ptrace.c,v 1.1 2017/04/02 21:44:00 kamil Exp $       */
+/*     $NetBSD: t_ptrace.c,v 1.2 2018/04/29 13:56:00 kamil Exp $       */
 
 /*-
  * Copyright (c) 2016 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: t_ptrace.c,v 1.1 2017/04/02 21:44:00 kamil Exp $");
+__RCSID("$NetBSD: t_ptrace.c,v 1.2 2018/04/29 13:56:00 kamil Exp $");
 
 #include <sys/param.h>
 #include <sys/types.h>
@@ -194,6 +194,25 @@
         ATF_REQUIRE(close(fds_toparent[0]) == 0);
 }
 
+ATF_TC(traceme_twice);
+ATF_TC_HEAD(traceme_twice, tc)
+{
+       atf_tc_set_md_var(tc, "descr",
+           "Assert that a process cannot mark its parent a debugger twice");
+}
+
+ATF_TC_BODY(traceme_twice, tc)
+{
+
+       printf("Mark the parent process (PID %d) a debugger of PID %d",
+              getppid(), getpid());
+       ATF_REQUIRE(ptrace(PT_TRACE_ME, 0, NULL, 0) == 0);
+
+       printf("Mark the parent process (PID %d) a debugger of PID %d again",
+              getppid(), getpid());
+       ATF_REQUIRE_ERRNO(EBUSY, ptrace(PT_TRACE_ME, 0, NULL, 0) == -1);
+}
+
 ATF_TP_ADD_TCS(tp)
 {
        setvbuf(stdout, NULL, _IONBF, 0);
@@ -203,6 +222,7 @@
        ATF_TP_ADD_TC(tp, attach_pid1_securelevel);
        ATF_TP_ADD_TC(tp, attach_self);
        ATF_TP_ADD_TC(tp, attach_chroot);
+       ATF_TP_ADD_TC(tp, traceme_twice);
 
        return atf_no_error();
 }
diff -r eb20f98c6263 -r a9634e97a51f tests/lib/libc/sys/t_ptrace_wait.c
--- a/tests/lib/libc/sys/t_ptrace_wait.c        Sun Apr 29 12:12:42 2018 +0000
+++ b/tests/lib/libc/sys/t_ptrace_wait.c        Sun Apr 29 13:56:00 2018 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: t_ptrace_wait.c,v 1.36 2018/04/28 19:00:25 kamil Exp $ */
+/*     $NetBSD: t_ptrace_wait.c,v 1.37 2018/04/29 13:56:00 kamil Exp $ */
 
 /*-
  * Copyright (c) 2016 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: t_ptrace_wait.c,v 1.36 2018/04/28 19:00:25 kamil Exp $");
+__RCSID("$NetBSD: t_ptrace_wait.c,v 1.37 2018/04/29 13:56:00 kamil Exp $");
 
 #include <sys/param.h>
 #include <sys/types.h>
@@ -319,6 +319,65 @@
 
 /// ----------------------------------------------------------------------------
 
+ATF_TC(traceme_pid1_parent);
+ATF_TC_HEAD(traceme_pid1_parent, tc)
+{
+       atf_tc_set_md_var(tc, "descr",
+           "Verify that PT_TRACE_ME is not allowed when our parent is PID1");
+}
+
+ATF_TC_BODY(traceme_pid1_parent, tc)
+{
+       struct msg_fds parent_child;
+       int exitval_child1 = 1, exitval_child2 = 2;
+       pid_t child1, child2, wpid;
+       uint8_t msg = 0xde; /* dummy message for IPC based on pipe(2) */
+#if defined(TWAIT_HAVE_STATUS)
+       int status;
+#endif
+
+       SYSCALL_REQUIRE(msg_open(&parent_child) == 0);
+
+       DPRINTF("Before forking process PID=%d\n", getpid());
+       SYSCALL_REQUIRE((child1 = fork()) != -1);
+       if (child1 == 0) {
+               DPRINTF("Before forking process PID=%d\n", getpid());
+               SYSCALL_REQUIRE((child2 = fork()) != -1);
+               if (child2 != 0) {
+                       DPRINTF("Parent process PID=%d, child2's PID=%d\n",
+                               getpid(), child2);
+                       _exit(exitval_child1);
+               }
+               CHILD_FROM_PARENT("exit child1", parent_child, msg);
+
+               DPRINTF("Assert that our parent is PID1 (initproc)\n");
+               FORKEE_ASSERT_EQ(getppid(), 1);
+
+               DPRINTF("Before calling PT_TRACE_ME from child %d\n", getpid());
+               FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) == -1);
+               SYSCALL_REQUIRE_ERRNO(errno, EPERM);
+
+               CHILD_TO_PARENT("child2 exiting", parent_child, msg);
+
+               _exit(exitval_child2);
+       }
+       DPRINTF("Parent process PID=%d, child1's PID=%d\n", getpid(), child1);
+
+       DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child1, &status, WEXITED),
+                             child1);
+
+       validate_status_exited(status, exitval_child1);
+
+       DPRINTF("Notify that child1 is dead\n");
+       PARENT_TO_CHILD("exit child1", parent_child, msg);
+
+       DPRINTF("Wait for exiting of child2\n");
+       PARENT_FROM_CHILD("child2 exiting", parent_child, msg);
+}
+
+/// ----------------------------------------------------------------------------
+
 #if defined(TWAIT_HAVE_PID)
 ATF_TC(attach1);
 ATF_TC_HEAD(attach1, tc)
@@ -6781,6 +6840,8 @@
        ATF_TP_ADD_TC(tp, traceme_signal_nohandler4);
        ATF_TP_ADD_TC(tp, traceme_signal_nohandler5);
 
+       ATF_TP_ADD_TC(tp, traceme_pid1_parent);
+
        ATF_TP_ADD_TC_HAVE_PID(tp, attach1);
        ATF_TP_ADD_TC_HAVE_PID(tp, attach2);
        ATF_TP_ADD_TC(tp, attach3);