[src/trunk]: src/tests/lib/libc/sys Add new user_va0_disable* tests in t_ptra...

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

details:   https://anonhg.NetBSD.org/src/rev/de367b6176aa
branches:  trunk
changeset: 451477:de367b6176aa
user:      kamil <kamil%NetBSD.org@localhost>
date:      Sat May 25 03:25:08 2019 +0000

description:
Add new user_va0_disable* tests in t_ptrace_wait*

Add tests:
 - user_va0_disable_pt_continue
 - user_va0_disable_pt_syscall
 - user_va0_disable_pt_detach

Assert that setting PC to 0x0 in PT_CONTINUE/PT_SYSCALL/PT_DETACH for
vm.user_va0_disable==0 is disallowed.

diffstat:

 tests/lib/libc/sys/t_ptrace_wait.c |  96 +++++++++++++++++++++++++++++++++++++-
 1 files changed, 94 insertions(+), 2 deletions(-)

diffs (124 lines):

diff -r d2057d4ae1b2 -r de367b6176aa tests/lib/libc/sys/t_ptrace_wait.c
--- a/tests/lib/libc/sys/t_ptrace_wait.c        Sat May 25 03:22:53 2019 +0000
+++ b/tests/lib/libc/sys/t_ptrace_wait.c        Sat May 25 03:25:08 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: t_ptrace_wait.c,v 1.121 2019/05/09 13:07:35 mgorny Exp $       */
+/*     $NetBSD: t_ptrace_wait.c,v 1.122 2019/05/25 03:25:08 kamil Exp $        */
 
 /*-
  * Copyright (c) 2016, 2017, 2018, 2019 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: t_ptrace_wait.c,v 1.121 2019/05/09 13:07:35 mgorny Exp $");
+__RCSID("$NetBSD: t_ptrace_wait.c,v 1.122 2019/05/25 03:25:08 kamil Exp $");
 
 #include <sys/param.h>
 #include <sys/types.h>
@@ -7438,6 +7438,94 @@
 
 /// ----------------------------------------------------------------------------
 
+static void
+user_va0_disable(int operation)
+{
+       pid_t child, wpid;
+#if defined(TWAIT_HAVE_STATUS)
+       int status;
+#endif
+       const int sigval = SIGSTOP;
+       int rv;
+
+       struct ptrace_siginfo info;
+
+       if (get_user_va0_disable() == 0)
+               atf_tc_skip("vm.user_va0_disable is set to 0");
+
+       memset(&info, 0, sizeof(info));
+
+       DPRINTF("Before forking process PID=%d\n", getpid());
+       SYSCALL_REQUIRE((child = fork()) != -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 raising %s from child\n", strsignal(sigval));
+               FORKEE_ASSERT(raise(sigval) == 0);
+
+               /* NOTREACHED */
+               FORKEE_ASSERTX(0 && "This shall not be reached");
+               __unreachable();
+       }
+       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_stopped(status, sigval);
+
+       DPRINTF("Before calling ptrace(2) with PT_GET_SIGINFO for "
+               "child\n");
+       SYSCALL_REQUIRE(ptrace(PT_GET_SIGINFO, child, &info,
+               sizeof(info)) != -1);
+
+       DPRINTF("Signal traced to lwpid=%d\n", info.psi_lwpid);
+       DPRINTF("Signal properties: si_signo=%#x si_code=%#x "
+               "si_errno=%#x\n",
+               info.psi_siginfo.si_signo, info.psi_siginfo.si_code,
+               info.psi_siginfo.si_errno);
+
+       ATF_REQUIRE_EQ(info.psi_siginfo.si_signo, sigval);
+       ATF_REQUIRE_EQ(info.psi_siginfo.si_code, SI_LWP);
+
+       DPRINTF("Before resuming the child process in PC=0x0 "
+           "and without signal to be sent\n");
+       errno = 0;
+       rv = ptrace(operation, child, (void *)0, 0);
+       ATF_REQUIRE_EQ(errno, EINVAL);
+       ATF_REQUIRE_EQ(rv, -1);
+
+       SYSCALL_REQUIRE(ptrace(PT_KILL, child, NULL, 0) != -1);
+
+       DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+       validate_status_signaled(status, SIGKILL, 0);
+
+       DPRINTF("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
+}
+
+#define USER_VA0_DISABLE(test, operation)                              \
+ATF_TC(test);                                                          \
+ATF_TC_HEAD(test, tc)                                                  \
+{                                                                      \
+       atf_tc_set_md_var(tc, "descr",                                  \
+           "Verify behavior of " #operation " with PC set to 0x0");    \
+}                                                                      \
+                                                                       \
+ATF_TC_BODY(test, tc)                                                  \
+{                                                                      \
+                                                                       \
+       user_va0_disable(operation);                                    \
+}
+
+USER_VA0_DISABLE(user_va0_disable_pt_continue, PT_CONTINUE)
+USER_VA0_DISABLE(user_va0_disable_pt_syscall, PT_SYSCALL)
+USER_VA0_DISABLE(user_va0_disable_pt_detach, PT_DETACH)
+
+/// ----------------------------------------------------------------------------
+
 #include "t_ptrace_amd64_wait.h"
 #include "t_ptrace_i386_wait.h"
 #include "t_ptrace_x86_wait.h"
@@ -7886,6 +7974,10 @@
        ATF_TP_ADD_TC_HAVE_PID(tp, traceme_vfork_clone_vfork);
 #endif
 
+       ATF_TP_ADD_TC(tp, user_va0_disable_pt_continue);
+       ATF_TP_ADD_TC(tp, user_va0_disable_pt_syscall);
+       ATF_TP_ADD_TC(tp, user_va0_disable_pt_detach);
+
        ATF_TP_ADD_TCS_PTRACE_WAIT_AMD64();
        ATF_TP_ADD_TCS_PTRACE_WAIT_I386();
        ATF_TP_ADD_TCS_PTRACE_WAIT_X86();