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[src/trunk]: src/tests/lib/libc/sys Add __clone(2) tests in t_ptrace_wait*



details:   https://anonhg.NetBSD.org/src/rev/38c017c7e3ea
branches:  trunk
changeset: 998037:38c017c7e3ea
user:      kamil <kamil%NetBSD.org@localhost>
date:      Fri Apr 05 22:58:53 2019 +0000

description:
Add __clone(2) tests in t_ptrace_wait*

The __clone(2) API is a variation of fork(2)/vfork(2) operations.

New tests:
 - clone_signalignored
 - clone_signalmasked
 - clone_vm_signalignored
 - clone_vm_signalmasked
 - clone_fs_signalignored
 - clone_fs_signalmasked
 - clone_files_signalignored
 - clone_files_signalmasked
 - clone_vfork_signalignored
 - clone_vfork_signalmasked

All new tests pass.

CLONE_SIGHAND tests are right now disabled as they cannot reuse the shared
signal operations (wait(2)) to wait for a clonee.

Another nit is that wait(2) must be used right now with WALLSIG as for some
reason the default variation doesn't work.

diffstat:

 tests/lib/libc/sys/t_ptrace_wait.c |  394 ++++++++++++++++++++++++++++++++++++-
 1 files changed, 392 insertions(+), 2 deletions(-)

diffs (truncated from 422 to 300 lines):

diff -r e6d65adf9e8b -r 38c017c7e3ea tests/lib/libc/sys/t_ptrace_wait.c
--- a/tests/lib/libc/sys/t_ptrace_wait.c        Fri Apr 05 21:41:18 2019 +0000
+++ b/tests/lib/libc/sys/t_ptrace_wait.c        Fri Apr 05 22:58:53 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: t_ptrace_wait.c,v 1.102 2019/04/03 08:19:46 kamil Exp $        */
+/*     $NetBSD: t_ptrace_wait.c,v 1.103 2019/04/05 22:58:53 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 1.102 2019/04/03 08:19:46 kamil Exp $");
+__RCSID("$NetBSD: t_ptrace_wait.c,v 1.103 2019/04/05 22:58:53 kamil Exp $");
 
 #include <sys/param.h>
 #include <sys/types.h>
@@ -6295,6 +6295,383 @@
        TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
 }
 
+/// ----------------------------------------------------------------------------
+
+#if defined(TWAIT_HAVE_PID)
+static int
+clone_func(void *arg)
+{
+       int ret;
+
+       ret = (int)(intptr_t)arg;
+
+       return ret;
+}
+
+static void
+clone_body(int flags, bool masked, bool ignored)
+{
+       const int exitval = 5;
+       const int exitval2 = 15;
+       const int sigval = SIGSTOP;
+       pid_t child, child2 = 0, wpid;
+#if defined(TWAIT_HAVE_STATUS)
+       int status;
+#endif
+       ptrace_state_t state;
+       const int slen = sizeof(state);
+       ptrace_event_t event;
+       const int elen = sizeof(event);
+       struct sigaction sa;
+       struct ptrace_siginfo info;
+       sigset_t intmask;
+       struct kinfo_proc2 kp;
+       size_t len = sizeof(kp);
+
+       int name[6];
+       const size_t namelen = __arraycount(name);
+       ki_sigset_t kp_sigmask;
+       ki_sigset_t kp_sigignore;
+
+       const size_t stack_size = 1024 * 1024;
+       void *stack, *stack_base;
+
+       stack = malloc(stack_size);
+       ATF_REQUIRE(stack != NULL);
+
+#ifdef __MACHINE_STACK_GROWS_UP
+       stack_base = stack;
+#else
+       stack_base = (char *)stack + stack_size;
+#endif
+
+       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);
+
+               if (masked) {
+                       sigemptyset(&intmask);
+                       sigaddset(&intmask, SIGTRAP);
+                       sigprocmask(SIG_BLOCK, &intmask, NULL);
+               }
+
+               if (ignored) {
+                       memset(&sa, 0, sizeof(sa));
+                       sa.sa_handler = SIG_IGN;
+                       sigemptyset(&sa.sa_mask);
+                       FORKEE_ASSERT(sigaction(SIGTRAP, &sa, NULL) != -1);
+               }
+               DPRINTF("Before raising %s from child\n", strsignal(sigval));
+               FORKEE_ASSERT(raise(sigval) == 0);
+
+               DPRINTF("Before forking process PID=%d flags=%#x\n", getpid(),
+                   flags);
+               SYSCALL_REQUIRE((child2 = __clone(clone_func, stack_base,
+                   flags|SIGCHLD, (void *)(intptr_t)exitval2)) != -1);
+
+               DPRINTF("Parent process PID=%d, child's PID=%d\n", getpid(),
+                   child2);
+
+               // XXX WALLSIG?
+               FORKEE_REQUIRE_SUCCESS
+                   (wpid = TWAIT_GENERIC(child2, &status, WALLSIG), child2);
+
+               forkee_status_exited(status, exitval2);
+
+               DPRINTF("Before exiting of the child process\n");
+               _exit(exitval);
+       }
+       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("Before checking siginfo_t\n");
+       ATF_REQUIRE_EQ(info.psi_siginfo.si_signo, sigval);
+       ATF_REQUIRE_EQ(info.psi_siginfo.si_code, SI_LWP);
+
+       name[0] = CTL_KERN,
+       name[1] = KERN_PROC2,
+       name[2] = KERN_PROC_PID;
+       name[3] = child;
+       name[4] = sizeof(kp);
+       name[5] = 1;
+
+       FORKEE_ASSERT_EQ(sysctl(name, namelen, &kp, &len, NULL, 0), 0);
+
+       if (masked)
+               kp_sigmask = kp.p_sigmask;
+
+       if (ignored)
+               kp_sigignore = kp.p_sigignore;
+
+       DPRINTF("Set PTRACE_FORK | PTRACE_VFORK | PTRACE_VFORK_DONE in "
+           "EVENT_MASK for the child %d\n", child);
+       event.pe_set_event = PTRACE_FORK | PTRACE_VFORK | PTRACE_VFORK_DONE;
+       SYSCALL_REQUIRE(ptrace(PT_SET_EVENT_MASK, child, &event, elen) != -1);
+
+       DPRINTF("Before resuming the child process where it left off and "
+           "without signal to be sent\n");
+       SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
+
+       DPRINTF("Before calling %s() for the child %d\n", TWAIT_FNAME,
+           child);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0),
+           child);
+
+       validate_status_stopped(status, SIGTRAP);
+
+       ATF_REQUIRE_EQ(sysctl(name, namelen, &kp, &len, NULL, 0), 0);
+
+       if (masked) {
+               DPRINTF("kp_sigmask="
+                   "%#02" PRIx32 "%02" PRIx32 "%02" PRIx32 "%02"
+                   PRIx32 "\n",
+                   kp_sigmask.__bits[0], kp_sigmask.__bits[1],
+                   kp_sigmask.__bits[2], kp_sigmask.__bits[3]);
+
+               DPRINTF("kp.p_sigmask="
+                   "%#02" PRIx32 "%02" PRIx32 "%02" PRIx32 "%02"
+                   PRIx32 "\n",
+                   kp.p_sigmask.__bits[0], kp.p_sigmask.__bits[1],
+                   kp.p_sigmask.__bits[2], kp.p_sigmask.__bits[3]);
+
+               ATF_REQUIRE(!memcmp(&kp_sigmask, &kp.p_sigmask,
+                   sizeof(kp_sigmask)));
+       }
+
+       if (ignored) {
+               DPRINTF("kp_sigignore="
+                   "%#02" PRIx32 "%02" PRIx32 "%02" PRIx32 "%02"
+                   PRIx32 "\n",
+                   kp_sigignore.__bits[0], kp_sigignore.__bits[1],
+                   kp_sigignore.__bits[2], kp_sigignore.__bits[3]);
+
+               DPRINTF("kp.p_sigignore="
+                   "%#02" PRIx32 "%02" PRIx32 "%02" PRIx32 "%02"
+                   PRIx32 "\n",
+                   kp.p_sigignore.__bits[0], kp.p_sigignore.__bits[1],
+                   kp.p_sigignore.__bits[2], kp.p_sigignore.__bits[3]);
+
+               ATF_REQUIRE(!memcmp(&kp_sigignore, &kp.p_sigignore,
+                   sizeof(kp_sigignore)));
+       }
+
+       SYSCALL_REQUIRE(
+           ptrace(PT_GET_PROCESS_STATE, child, &state, slen) != -1);
+       DPRINTF("state.pe_report_event=%#x pid=%d\n", state.pe_report_event,
+           child2);
+       if (!(flags & CLONE_VFORK)) {
+               ATF_REQUIRE_EQ(state.pe_report_event & PTRACE_FORK,
+                      PTRACE_FORK);
+       } else {
+               ATF_REQUIRE_EQ(state.pe_report_event & PTRACE_VFORK,
+                      PTRACE_VFORK);
+       }
+
+       child2 = state.pe_other_pid;
+       DPRINTF("Reported ptrace event with forkee %d\n", child2);
+
+       DPRINTF("Before calling %s() for the forkee %d of the child "
+           "%d\n", TWAIT_FNAME, child2, child);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child2, &status, 0),
+           child2);
+
+       validate_status_stopped(status, SIGTRAP);
+
+       name[3] = child2;
+       ATF_REQUIRE_EQ(sysctl(name, namelen, &kp, &len, NULL, 0), 0);
+
+       if (masked) {
+               DPRINTF("kp_sigmask="
+                   "%#02" PRIx32 "%02" PRIx32 "%02" PRIx32 "%02"
+                   PRIx32 "\n",
+                   kp_sigmask.__bits[0], kp_sigmask.__bits[1],
+                   kp_sigmask.__bits[2], kp_sigmask.__bits[3]);
+
+               DPRINTF("kp.p_sigmask="
+                   "%#02" PRIx32 "%02" PRIx32 "%02" PRIx32 "%02"
+                   PRIx32 "\n",
+                   kp.p_sigmask.__bits[0], kp.p_sigmask.__bits[1],
+                   kp.p_sigmask.__bits[2], kp.p_sigmask.__bits[3]);
+
+               ATF_REQUIRE(!memcmp(&kp_sigmask, &kp.p_sigmask,
+                   sizeof(kp_sigmask)));
+       }
+
+       if (ignored) {
+               DPRINTF("kp_sigignore="
+                   "%#02" PRIx32 "%02" PRIx32 "%02" PRIx32 "%02"
+                   PRIx32 "\n",
+                   kp_sigignore.__bits[0], kp_sigignore.__bits[1],
+                   kp_sigignore.__bits[2], kp_sigignore.__bits[3]);
+
+               DPRINTF("kp.p_sigignore="
+                   "%#02" PRIx32 "%02" PRIx32 "%02" PRIx32 "%02"
+                   PRIx32 "\n",
+                   kp.p_sigignore.__bits[0], kp.p_sigignore.__bits[1],
+                   kp.p_sigignore.__bits[2], kp.p_sigignore.__bits[3]);
+
+               ATF_REQUIRE(!memcmp(&kp_sigignore, &kp.p_sigignore,
+                   sizeof(kp_sigignore)));
+       }
+
+       SYSCALL_REQUIRE(
+           ptrace(PT_GET_PROCESS_STATE, child2, &state, slen) != -1);
+       if (!(flags & CLONE_VFORK)) {
+               ATF_REQUIRE_EQ(state.pe_report_event & PTRACE_FORK,
+                      PTRACE_FORK);
+       } else {
+               ATF_REQUIRE_EQ(state.pe_report_event & PTRACE_VFORK,
+                      PTRACE_VFORK);
+       }
+
+       ATF_REQUIRE_EQ(state.pe_other_pid, child);
+
+       DPRINTF("Before resuming the forkee process where it left off "
+           "and without signal to be sent\n");
+       SYSCALL_REQUIRE(
+           ptrace(PT_CONTINUE, child2, (void *)1, 0) != -1);
+
+       DPRINTF("Before resuming the child process where it left off "
+           "and without signal to be sent\n");
+       SYSCALL_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
+
+       if (flags & CLONE_VFORK) {
+               DPRINTF("Before calling %s() for the child %d\n", TWAIT_FNAME,
+                   child);
+               TWAIT_REQUIRE_SUCCESS(
+                   wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+               validate_status_stopped(status, SIGTRAP);
+
+               name[3] = child;
+               ATF_REQUIRE_EQ(sysctl(name, namelen, &kp, &len, NULL, 0), 0);
+
+               /*
+                * SIGCHLD is now pending in the signal queue and
+                * the kernel presents it to userland as a masked signal.
+                */
+               sigdelset((sigset_t *)&kp.p_sigmask, SIGCHLD);
+
+               if (masked) {
+                       DPRINTF("kp_sigmask="
+                           "%#02" PRIx32 "%02" PRIx32 "%02" PRIx32 "%02"
+                           PRIx32 "\n",
+                           kp_sigmask.__bits[0], kp_sigmask.__bits[1],
+                           kp_sigmask.__bits[2], kp_sigmask.__bits[3]);
+
+                       DPRINTF("kp.p_sigmask="
+                           "%#02" PRIx32 "%02" PRIx32 "%02" PRIx32 "%02"
+                           PRIx32 "\n",
+                           kp.p_sigmask.__bits[0], kp.p_sigmask.__bits[1],
+                           kp.p_sigmask.__bits[2], kp.p_sigmask.__bits[3]);



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