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Index: tests/sys/kern/ptrace_test.c
===================================================================
--- tests/sys/kern/ptrace_test.c
+++ tests/sys/kern/ptrace_test.c
@@ -866,6 +866,92 @@
ATF_REQUIRE(errno == ECHILD);
}
+/*
+ * Verify that a child process does not see an unrelated debugger as its
+ * parent but sees its original parent process.
+ */
+ATF_TC_WITHOUT_HEAD(ptrace__getppid);
+ATF_TC_BODY(ptrace__getppid, tc)
+{
+ pid_t child, debugger, ppid, wpid;
+ int cpipe[2], dpipe[2], status;
+ char c;
+
+ ATF_REQUIRE(pipe(cpipe) == 0);
+ ATF_REQUIRE((child = fork()) != -1);
+
+ if (child == 0) {
+ /* Child process. */
+ close(cpipe[0]);
+
+ /* Wait for parent to be ready. */
+ CHILD_REQUIRE(read(cpipe[1], &c, sizeof(c)) == sizeof(c));
+
+ /* Report the parent PID to the parent. */
+ ppid = getppid();
+ CHILD_REQUIRE(write(cpipe[1], &ppid, sizeof(ppid)) ==
+ sizeof(ppid));
+
+ _exit(1);
+ }
+ close(cpipe[1]);
+
+ ATF_REQUIRE(pipe(dpipe) == 0);
+ ATF_REQUIRE((debugger = fork()) != -1);
+
+ if (debugger == 0) {
+ /* Debugger process. */
+ close(dpipe[0]);
+
+ CHILD_REQUIRE(ptrace(PT_ATTACH, child, NULL, 0) != -1);
+
+ wpid = waitpid(child, &status, 0);
+ CHILD_REQUIRE(wpid == child);
+ CHILD_REQUIRE(WIFSTOPPED(status));
+ CHILD_REQUIRE(WSTOPSIG(status) == SIGSTOP);
+
+ CHILD_REQUIRE(ptrace(PT_CONTINUE, child, (caddr_t)1, 0) != -1);
+
+ /* Signal parent that debugger is attached. */
+ CHILD_REQUIRE(write(dpipe[1], &c, sizeof(c)) == sizeof(c));
+
+ /* Wait for traced child to exit. */
+ wpid = waitpid(child, &status, 0);
+ CHILD_REQUIRE(wpid == child);
+ CHILD_REQUIRE(WIFEXITED(status));
+ CHILD_REQUIRE(WEXITSTATUS(status) == 1);
+
+ _exit(0);
+ }
+ close(dpipe[1]);
+
+ /* Parent process. */
+
+ /* Wait for the debugger to attach to the child. */
+ ATF_REQUIRE(read(dpipe[0], &c, sizeof(c)) == sizeof(c));
+
+ /* Release the child. */
+ ATF_REQUIRE(write(cpipe[0], &c, sizeof(c)) == sizeof(c));
+
+ /* Read the parent PID from the child. */
+ ATF_REQUIRE(read(cpipe[0], &ppid, sizeof(ppid)) == sizeof(ppid));
+ close(cpipe[0]);
+
+ ATF_REQUIRE(ppid == getpid());
+
+ /* Wait for the debugger. */
+ wpid = waitpid(debugger, &status, 0);
+ ATF_REQUIRE(wpid == debugger);
+ ATF_REQUIRE(WIFEXITED(status));
+ ATF_REQUIRE(WEXITSTATUS(status) == 0);
+
+ /* The child process should now be ready. */
+ wpid = waitpid(child, &status, WNOHANG);
+ ATF_REQUIRE(wpid == child);
+ ATF_REQUIRE(WIFEXITED(status));
+ ATF_REQUIRE(WEXITSTATUS(status) == 1);
+}
+
ATF_TP_ADD_TCS(tp)
{
@@ -881,6 +967,7 @@
ptrace__follow_fork_child_detached_unrelated_debugger);
ATF_TP_ADD_TC(tp,
ptrace__follow_fork_parent_detached_unrelated_debugger);
+ ATF_TP_ADD_TC(tp, ptrace__getppid);
return (atf_no_error());
}

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