c209e3e2e6
not the old parent. Otherwise, proc_reap() will leave the zombie in place resulting in the process' status being returned twice to its parent. Add test cases for PT_TRACE_ME and PT_ATTACH which are fixed by this change. Differential Revision: https://reviews.freebsd.org/D2594 Reviewed by: kib MFC after: 2 weeks
144 lines
4.2 KiB
C
144 lines
4.2 KiB
C
/*-
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* Copyright (c) 2015 John Baldwin <jhb@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <atf-c.h>
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/*
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* Verify that a parent debugger process "sees" the exit of a debugged
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* process exactly once when attached via PT_TRACE_ME.
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*/
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ATF_TC_WITHOUT_HEAD(ptrace__parent_wait_after_trace_me);
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ATF_TC_BODY(ptrace__parent_wait_after_trace_me, tc)
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{
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pid_t child, wpid;
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int status;
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ATF_REQUIRE((child = fork()) != -1);
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if (child == 0) {
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/* Child process. */
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ATF_REQUIRE(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);
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/* Trigger a stop. */
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raise(SIGSTOP);
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exit(1);
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}
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/* Parent process. */
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/* The first wait() should report the stop from SIGSTOP. */
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wpid = waitpid(child, &status, 0);
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ATF_REQUIRE(wpid == child);
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ATF_REQUIRE(WIFSTOPPED(status));
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ATF_REQUIRE(WSTOPSIG(status) == SIGSTOP);
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/* Continue the child ignoring the SIGSTOP. */
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ATF_REQUIRE(ptrace(PT_CONTINUE, child, (caddr_t)1, 0) != -1);
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/* The second wait() should report the exit status. */
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wpid = waitpid(child, &status, 0);
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ATF_REQUIRE(wpid == child);
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ATF_REQUIRE(WIFEXITED(status));
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ATF_REQUIRE(WEXITSTATUS(status) == 1);
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/* The child should no longer exist. */
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wpid = waitpid(child, &status, 0);
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ATF_REQUIRE(wpid == -1);
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ATF_REQUIRE(errno == ECHILD);
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}
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/*
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* Verify that a parent debugger process "sees" the exit of a debugged
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* process exactly once when attached via PT_ATTACH.
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*/
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ATF_TC_WITHOUT_HEAD(ptrace__parent_wait_after_attach);
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ATF_TC_BODY(ptrace__parent_wait_after_attach, tc)
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{
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pid_t child, wpid;
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int cpipe[2], status;
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char c;
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ATF_REQUIRE(pipe(cpipe) == 0);
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ATF_REQUIRE((child = fork()) != -1);
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if (child == 0) {
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/* Child process. */
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close(cpipe[0]);
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/* Wait for the parent to attach. */
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ATF_REQUIRE(read(cpipe[1], &c, sizeof(c)) == 0);
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exit(1);
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}
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close(cpipe[1]);
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/* Parent process. */
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/* Attach to the child process. */
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ATF_REQUIRE(ptrace(PT_ATTACH, child, NULL, 0) == 0);
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/* The first wait() should report the SIGSTOP from PT_ATTACH. */
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wpid = waitpid(child, &status, 0);
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ATF_REQUIRE(wpid == child);
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ATF_REQUIRE(WIFSTOPPED(status));
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ATF_REQUIRE(WSTOPSIG(status) == SIGSTOP);
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/* Continue the child ignoring the SIGSTOP. */
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ATF_REQUIRE(ptrace(PT_CONTINUE, child, (caddr_t)1, 0) != -1);
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/* Signal the child to exit. */
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close(cpipe[0]);
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/* The second wait() should report the exit status. */
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wpid = waitpid(child, &status, 0);
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ATF_REQUIRE(wpid == child);
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ATF_REQUIRE(WIFEXITED(status));
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ATF_REQUIRE(WEXITSTATUS(status) == 1);
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/* The child should no longer exist. */
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wpid = waitpid(child, &status, 0);
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ATF_REQUIRE(wpid == -1);
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ATF_REQUIRE(errno == ECHILD);
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}
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ATF_TP_ADD_TCS(tp)
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{
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ATF_TP_ADD_TC(tp, ptrace__parent_wait_after_trace_me);
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ATF_TP_ADD_TC(tp, ptrace__parent_wait_after_attach);
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return (atf_no_error());
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}
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