Date: Sat, 1 Aug 2015 16:27:53 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r286158 - in head: sys/kern tests/sys/kern Message-ID: <201508011627.t71GRr9D025781@repo.freebsd.org>
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Author: jhb Date: Sat Aug 1 16:27:52 2015 New Revision: 286158 URL: https://svnweb.freebsd.org/changeset/base/286158 Log: Clear P_TRACED before reparenting a detached process back to its original parent. Otherwise the debugee will be set as an orphan of the debugger. Add tests for tracing forks via PT_FOLLOW_FORK. Reviewed by: kib MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D2809 Modified: head/sys/kern/sys_process.c head/tests/sys/kern/ptrace_test.c Modified: head/sys/kern/sys_process.c ============================================================================== --- head/sys/kern/sys_process.c Sat Aug 1 12:20:55 2015 (r286157) +++ head/sys/kern/sys_process.c Sat Aug 1 16:27:52 2015 (r286158) @@ -947,7 +947,15 @@ kern_ptrace(struct thread *td, int req, } break; case PT_DETACH: - /* reset process parent */ + /* + * Reset the process parent. + * + * NB: This clears P_TRACED before reparenting + * a detached process back to its original + * parent. Otherwise the debugee will be set + * as an orphan of the debugger. + */ + p->p_flag &= ~(P_TRACED | P_WAITED | P_FOLLOWFORK); if (p->p_oppid != p->p_pptr->p_pid) { PROC_LOCK(p->p_pptr); sigqueue_take(p->p_ksi); @@ -963,7 +971,6 @@ kern_ptrace(struct thread *td, int req, } else CTR1(KTR_PTRACE, "PT_DETACH: pid %d", p->p_pid); p->p_oppid = 0; - p->p_flag &= ~(P_TRACED | P_WAITED | P_FOLLOWFORK); p->p_stops = 0; /* should we send SIGCHLD? */ Modified: head/tests/sys/kern/ptrace_test.c ============================================================================== --- head/tests/sys/kern/ptrace_test.c Sat Aug 1 12:20:55 2015 (r286157) +++ head/tests/sys/kern/ptrace_test.c Sat Aug 1 16:27:52 2015 (r286158) @@ -50,7 +50,7 @@ __FBSDID("$FreeBSD$"); #exp " not met"); \ } while (0) -static void __dead2 +static __dead2 void child_fail_require(const char *file, int line, const char *str) { char buf[128]; @@ -60,6 +60,58 @@ child_fail_require(const char *file, int _exit(32); } +static void +trace_me(void) +{ + + /* Attach the parent process as a tracer of this process. */ + CHILD_REQUIRE(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1); + + /* Trigger a stop. */ + raise(SIGSTOP); +} + +static void +attach_child(pid_t pid) +{ + pid_t wpid; + int status; + + ATF_REQUIRE(ptrace(PT_ATTACH, pid, NULL, 0) == 0); + + wpid = waitpid(pid, &status, 0); + ATF_REQUIRE(wpid == pid); + ATF_REQUIRE(WIFSTOPPED(status)); + ATF_REQUIRE(WSTOPSIG(status) == SIGSTOP); +} + +static void +wait_for_zombie(pid_t pid) +{ + + /* + * Wait for a process to exit. This is kind of gross, but + * there is not a better way. + */ + for (;;) { + struct kinfo_proc kp; + size_t len; + int mib[4]; + + mib[0] = CTL_KERN; + mib[1] = KERN_PROC; + mib[2] = KERN_PROC_PID; + mib[3] = pid; + len = sizeof(kp); + if (sysctl(mib, nitems(mib), &kp, &len, NULL, 0) == -1) { + /* The KERN_PROC_PID sysctl fails for zombies. */ + ATF_REQUIRE(errno == ESRCH); + break; + } + usleep(5000); + } +} + /* * Verify that a parent debugger process "sees" the exit of a debugged * process exactly once when attached via PT_TRACE_ME. @@ -73,10 +125,7 @@ ATF_TC_BODY(ptrace__parent_wait_after_tr ATF_REQUIRE((child = fork()) != -1); if (child == 0) { /* Child process. */ - CHILD_REQUIRE(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1); - - /* Trigger a stop. */ - raise(SIGSTOP); + trace_me(); exit(1); } @@ -131,13 +180,7 @@ ATF_TC_BODY(ptrace__parent_wait_after_at /* Parent process. */ /* Attach to the child process. */ - ATF_REQUIRE(ptrace(PT_ATTACH, child, NULL, 0) == 0); - - /* The first wait() should report the SIGSTOP from PT_ATTACH. */ - wpid = waitpid(child, &status, 0); - ATF_REQUIRE(wpid == child); - ATF_REQUIRE(WIFSTOPPED(status)); - ATF_REQUIRE(WSTOPSIG(status) == SIGSTOP); + attach_child(child); /* Continue the child ignoring the SIGSTOP. */ ATF_REQUIRE(ptrace(PT_CONTINUE, child, (caddr_t)1, 0) != -1); @@ -223,27 +266,7 @@ ATF_TC_BODY(ptrace__parent_sees_exit_aft ATF_REQUIRE(read(cpipe[0], &c, sizeof(c)) == 0); close(cpipe[0]); - /* - * Wait for the child to exit. This is kind of gross, but - * there is not a better way. - */ - for (;;) { - struct kinfo_proc kp; - size_t len; - int mib[4]; - - mib[0] = CTL_KERN; - mib[1] = KERN_PROC; - mib[2] = KERN_PROC_PID; - mib[3] = child; - len = sizeof(kp); - if (sysctl(mib, nitems(mib), &kp, &len, NULL, 0) == -1) { - /* The KERN_PROC_PID sysctl fails for zombies. */ - ATF_REQUIRE(errno == ESRCH); - break; - } - usleep(5000); - } + wait_for_zombie(child); /* * This wait should return a pid of 0 to indicate no status to @@ -357,27 +380,7 @@ ATF_TC_BODY(ptrace__parent_sees_exit_aft ATF_REQUIRE(read(cpipe[0], &c, sizeof(c)) == 0); close(cpipe[0]); - /* - * Wait for the child to exit. This is kind of gross, but - * there is not a better way. - */ - for (;;) { - struct kinfo_proc kp; - size_t len; - int mib[4]; - - mib[0] = CTL_KERN; - mib[1] = KERN_PROC; - mib[2] = KERN_PROC_PID; - mib[3] = child; - len = sizeof(kp); - if (sysctl(mib, nitems(mib), &kp, &len, NULL, 0) == -1) { - /* The KERN_PROC_PID sysctl fails for zombies. */ - ATF_REQUIRE(errno == ESRCH); - break; - } - usleep(5000); - } + wait_for_zombie(child); /* * This wait should return a pid of 0 to indicate no status to @@ -401,6 +404,468 @@ ATF_TC_BODY(ptrace__parent_sees_exit_aft ATF_REQUIRE(WEXITSTATUS(status) == 1); } +/* + * The parent process should always act the same regardless of how the + * debugger is attached to it. + */ +static __dead2 void +follow_fork_parent(void) +{ + pid_t fpid, wpid; + int status; + + CHILD_REQUIRE((fpid = fork()) != -1); + + if (fpid == 0) + /* Child */ + exit(2); + + wpid = waitpid(fpid, &status, 0); + CHILD_REQUIRE(wpid == fpid); + CHILD_REQUIRE(WIFEXITED(status)); + CHILD_REQUIRE(WEXITSTATUS(status) == 2); + + exit(1); +} + +/* + * Helper routine for follow fork tests. This waits for two stops + * that report both "sides" of a fork. It returns the pid of the new + * child process. + */ +static pid_t +handle_fork_events(pid_t parent) +{ + struct ptrace_lwpinfo pl; + bool fork_reported[2]; + pid_t child, wpid; + int i, status; + + fork_reported[0] = false; + fork_reported[1] = false; + child = -1; + + /* + * Each process should report a fork event. The parent should + * report a PL_FLAG_FORKED event, and the child should report + * a PL_FLAG_CHILD event. + */ + for (i = 0; i < 2; i++) { + wpid = wait(&status); + ATF_REQUIRE(wpid > 0); + ATF_REQUIRE(WIFSTOPPED(status)); + + ATF_REQUIRE(ptrace(PT_LWPINFO, wpid, (caddr_t)&pl, + sizeof(pl)) != -1); + ATF_REQUIRE((pl.pl_flags & (PL_FLAG_FORKED | PL_FLAG_CHILD)) != + 0); + ATF_REQUIRE((pl.pl_flags & (PL_FLAG_FORKED | PL_FLAG_CHILD)) != + (PL_FLAG_FORKED | PL_FLAG_CHILD)); + if (pl.pl_flags & PL_FLAG_CHILD) { + ATF_REQUIRE(wpid != parent); + ATF_REQUIRE(WSTOPSIG(status) == SIGSTOP); + ATF_REQUIRE(!fork_reported[1]); + if (child == -1) + child = wpid; + else + ATF_REQUIRE(child == wpid); + fork_reported[1] = true; + } else { + ATF_REQUIRE(wpid == parent); + ATF_REQUIRE(WSTOPSIG(status) == SIGTRAP); + ATF_REQUIRE(!fork_reported[0]); + if (child == -1) + child = pl.pl_child_pid; + else + ATF_REQUIRE(child == pl.pl_child_pid); + fork_reported[0] = true; + } + } + + return (child); +} + +/* + * Verify that a new child process is stopped after a followed fork and + * that the traced parent sees the exit of the child after the debugger + * when both processes remain attached to the debugger. + */ +ATF_TC_WITHOUT_HEAD(ptrace__follow_fork_both_attached); +ATF_TC_BODY(ptrace__follow_fork_both_attached, tc) +{ + pid_t children[0], fpid, wpid; + int status; + + ATF_REQUIRE((fpid = fork()) != -1); + if (fpid == 0) { + trace_me(); + follow_fork_parent(); + } + + /* Parent process. */ + children[0] = fpid; + + /* The first wait() should report the stop from SIGSTOP. */ + wpid = waitpid(children[0], &status, 0); + ATF_REQUIRE(wpid == children[0]); + ATF_REQUIRE(WIFSTOPPED(status)); + ATF_REQUIRE(WSTOPSIG(status) == SIGSTOP); + + ATF_REQUIRE(ptrace(PT_FOLLOW_FORK, children[0], NULL, 1) != -1); + + /* Continue the child ignoring the SIGSTOP. */ + ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1); + + children[1] = handle_fork_events(children[0]); + ATF_REQUIRE(children[1] > 0); + + ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1); + ATF_REQUIRE(ptrace(PT_CONTINUE, children[1], (caddr_t)1, 0) != -1); + + /* + * The child can't exit until the grandchild reports status, so the + * grandchild should report its exit first to the debugger. + */ + wpid = wait(&status); + ATF_REQUIRE(wpid == children[1]); + ATF_REQUIRE(WIFEXITED(status)); + ATF_REQUIRE(WEXITSTATUS(status) == 2); + + wpid = wait(&status); + ATF_REQUIRE(wpid == children[0]); + ATF_REQUIRE(WIFEXITED(status)); + ATF_REQUIRE(WEXITSTATUS(status) == 1); + + wpid = wait(&status); + ATF_REQUIRE(wpid == -1); + ATF_REQUIRE(errno == ECHILD); +} + +/* + * Verify that a new child process is stopped after a followed fork + * and that the traced parent sees the exit of the child when the new + * child process is detached after it reports its fork. + */ +ATF_TC_WITHOUT_HEAD(ptrace__follow_fork_child_detached); +ATF_TC_BODY(ptrace__follow_fork_child_detached, tc) +{ + pid_t children[0], fpid, wpid; + int status; + + ATF_REQUIRE((fpid = fork()) != -1); + if (fpid == 0) { + trace_me(); + follow_fork_parent(); + } + + /* Parent process. */ + children[0] = fpid; + + /* The first wait() should report the stop from SIGSTOP. */ + wpid = waitpid(children[0], &status, 0); + ATF_REQUIRE(wpid == children[0]); + ATF_REQUIRE(WIFSTOPPED(status)); + ATF_REQUIRE(WSTOPSIG(status) == SIGSTOP); + + ATF_REQUIRE(ptrace(PT_FOLLOW_FORK, children[0], NULL, 1) != -1); + + /* Continue the child ignoring the SIGSTOP. */ + ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1); + + children[1] = handle_fork_events(children[0]); + ATF_REQUIRE(children[1] > 0); + + ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1); + ATF_REQUIRE(ptrace(PT_DETACH, children[1], (caddr_t)1, 0) != -1); + + /* + * Should not see any status from the grandchild now, only the + * child. + */ + wpid = wait(&status); + ATF_REQUIRE(wpid == children[0]); + ATF_REQUIRE(WIFEXITED(status)); + ATF_REQUIRE(WEXITSTATUS(status) == 1); + + wpid = wait(&status); + ATF_REQUIRE(wpid == -1); + ATF_REQUIRE(errno == ECHILD); +} + +/* + * Verify that a new child process is stopped after a followed fork + * and that the traced parent sees the exit of the child when the + * traced parent is detached after the fork. + */ +ATF_TC_WITHOUT_HEAD(ptrace__follow_fork_parent_detached); +ATF_TC_BODY(ptrace__follow_fork_parent_detached, tc) +{ + pid_t children[0], fpid, wpid; + int status; + + ATF_REQUIRE((fpid = fork()) != -1); + if (fpid == 0) { + trace_me(); + follow_fork_parent(); + } + + /* Parent process. */ + children[0] = fpid; + + /* The first wait() should report the stop from SIGSTOP. */ + wpid = waitpid(children[0], &status, 0); + ATF_REQUIRE(wpid == children[0]); + ATF_REQUIRE(WIFSTOPPED(status)); + ATF_REQUIRE(WSTOPSIG(status) == SIGSTOP); + + ATF_REQUIRE(ptrace(PT_FOLLOW_FORK, children[0], NULL, 1) != -1); + + /* Continue the child ignoring the SIGSTOP. */ + ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1); + + children[1] = handle_fork_events(children[0]); + ATF_REQUIRE(children[1] > 0); + + ATF_REQUIRE(ptrace(PT_DETACH, children[0], (caddr_t)1, 0) != -1); + ATF_REQUIRE(ptrace(PT_CONTINUE, children[1], (caddr_t)1, 0) != -1); + + /* + * The child can't exit until the grandchild reports status, so the + * grandchild should report its exit first to the debugger. + * + * Even though the child process is detached, it is still a + * child of the debugger, so it will still report it's exit + * after the grandchild. + */ + wpid = wait(&status); + ATF_REQUIRE(wpid == children[1]); + ATF_REQUIRE(WIFEXITED(status)); + ATF_REQUIRE(WEXITSTATUS(status) == 2); + + wpid = wait(&status); + ATF_REQUIRE(wpid == children[0]); + ATF_REQUIRE(WIFEXITED(status)); + ATF_REQUIRE(WEXITSTATUS(status) == 1); + + wpid = wait(&status); + ATF_REQUIRE(wpid == -1); + ATF_REQUIRE(errno == ECHILD); +} + +static void +attach_fork_parent(int cpipe[2]) +{ + pid_t fpid; + + close(cpipe[0]); + + /* Double-fork to disassociate from the debugger. */ + CHILD_REQUIRE((fpid = fork()) != -1); + if (fpid != 0) + exit(3); + + /* Send the pid of the disassociated child to the debugger. */ + fpid = getpid(); + CHILD_REQUIRE(write(cpipe[1], &fpid, sizeof(fpid)) == sizeof(fpid)); + + /* Wait for the debugger to attach. */ + CHILD_REQUIRE(read(cpipe[1], &fpid, sizeof(fpid)) == 0); +} + +/* + * Verify that a new child process is stopped after a followed fork and + * that the traced parent sees the exit of the child after the debugger + * when both processes remain attached to the debugger. In this test + * the parent that forks is not a direct child of the debugger. + */ +ATF_TC_WITHOUT_HEAD(ptrace__follow_fork_both_attached_unrelated_debugger); +ATF_TC_BODY(ptrace__follow_fork_both_attached_unrelated_debugger, tc) +{ + pid_t children[0], fpid, wpid; + int cpipe[2], status; + + ATF_REQUIRE(pipe(cpipe) == 0); + ATF_REQUIRE((fpid = fork()) != -1); + if (fpid == 0) { + attach_fork_parent(cpipe); + follow_fork_parent(); + } + + /* Parent process. */ + close(cpipe[1]); + + /* Wait for the direct child to exit. */ + wpid = waitpid(fpid, &status, 0); + ATF_REQUIRE(wpid == fpid); + ATF_REQUIRE(WIFEXITED(status)); + ATF_REQUIRE(WEXITSTATUS(status) == 3); + + /* Read the pid of the fork parent. */ + ATF_REQUIRE(read(cpipe[0], &children[0], sizeof(children[0])) == + sizeof(children[0])); + + /* Attach to the fork parent. */ + attach_child(children[0]); + + ATF_REQUIRE(ptrace(PT_FOLLOW_FORK, children[0], NULL, 1) != -1); + + /* Continue the fork parent ignoring the SIGSTOP. */ + ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1); + + /* Signal the fork parent to continue. */ + close(cpipe[0]); + + children[1] = handle_fork_events(children[0]); + ATF_REQUIRE(children[1] > 0); + + ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1); + ATF_REQUIRE(ptrace(PT_CONTINUE, children[1], (caddr_t)1, 0) != -1); + + /* + * The fork parent can't exit until the child reports status, + * so the child should report its exit first to the debugger. + */ + wpid = wait(&status); + ATF_REQUIRE(wpid == children[1]); + ATF_REQUIRE(WIFEXITED(status)); + ATF_REQUIRE(WEXITSTATUS(status) == 2); + + wpid = wait(&status); + ATF_REQUIRE(wpid == children[0]); + ATF_REQUIRE(WIFEXITED(status)); + ATF_REQUIRE(WEXITSTATUS(status) == 1); + + wpid = wait(&status); + ATF_REQUIRE(wpid == -1); + ATF_REQUIRE(errno == ECHILD); +} + +/* + * Verify that a new child process is stopped after a followed fork + * and that the traced parent sees the exit of the child when the new + * child process is detached after it reports its fork. In this test + * the parent that forks is not a direct child of the debugger. + */ +ATF_TC_WITHOUT_HEAD(ptrace__follow_fork_child_detached_unrelated_debugger); +ATF_TC_BODY(ptrace__follow_fork_child_detached_unrelated_debugger, tc) +{ + pid_t children[0], fpid, wpid; + int cpipe[2], status; + + ATF_REQUIRE(pipe(cpipe) == 0); + ATF_REQUIRE((fpid = fork()) != -1); + if (fpid == 0) { + attach_fork_parent(cpipe); + follow_fork_parent(); + } + + /* Parent process. */ + close(cpipe[1]); + + /* Wait for the direct child to exit. */ + wpid = waitpid(fpid, &status, 0); + ATF_REQUIRE(wpid == fpid); + ATF_REQUIRE(WIFEXITED(status)); + ATF_REQUIRE(WEXITSTATUS(status) == 3); + + /* Read the pid of the fork parent. */ + ATF_REQUIRE(read(cpipe[0], &children[0], sizeof(children[0])) == + sizeof(children[0])); + + /* Attach to the fork parent. */ + attach_child(children[0]); + + ATF_REQUIRE(ptrace(PT_FOLLOW_FORK, children[0], NULL, 1) != -1); + + /* Continue the fork parent ignoring the SIGSTOP. */ + ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1); + + /* Signal the fork parent to continue. */ + close(cpipe[0]); + + children[1] = handle_fork_events(children[0]); + ATF_REQUIRE(children[1] > 0); + + ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1); + ATF_REQUIRE(ptrace(PT_DETACH, children[1], (caddr_t)1, 0) != -1); + + /* + * Should not see any status from the child now, only the fork + * parent. + */ + wpid = wait(&status); + ATF_REQUIRE(wpid == children[0]); + ATF_REQUIRE(WIFEXITED(status)); + ATF_REQUIRE(WEXITSTATUS(status) == 1); + + wpid = wait(&status); + ATF_REQUIRE(wpid == -1); + ATF_REQUIRE(errno == ECHILD); +} + +/* + * Verify that a new child process is stopped after a followed fork + * and that the traced parent sees the exit of the child when the + * traced parent is detached after the fork. In this test the parent + * that forks is not a direct child of the debugger. + */ +ATF_TC_WITHOUT_HEAD(ptrace__follow_fork_parent_detached_unrelated_debugger); +ATF_TC_BODY(ptrace__follow_fork_parent_detached_unrelated_debugger, tc) +{ + pid_t children[0], fpid, wpid; + int cpipe[2], status; + + ATF_REQUIRE(pipe(cpipe) == 0); + ATF_REQUIRE((fpid = fork()) != -1); + if (fpid == 0) { + attach_fork_parent(cpipe); + follow_fork_parent(); + } + + /* Parent process. */ + close(cpipe[1]); + + /* Wait for the direct child to exit. */ + wpid = waitpid(fpid, &status, 0); + ATF_REQUIRE(wpid == fpid); + ATF_REQUIRE(WIFEXITED(status)); + ATF_REQUIRE(WEXITSTATUS(status) == 3); + + /* Read the pid of the fork parent. */ + ATF_REQUIRE(read(cpipe[0], &children[0], sizeof(children[0])) == + sizeof(children[0])); + + /* Attach to the fork parent. */ + attach_child(children[0]); + + ATF_REQUIRE(ptrace(PT_FOLLOW_FORK, children[0], NULL, 1) != -1); + + /* Continue the fork parent ignoring the SIGSTOP. */ + ATF_REQUIRE(ptrace(PT_CONTINUE, children[0], (caddr_t)1, 0) != -1); + + /* Signal the fork parent to continue. */ + close(cpipe[0]); + + children[1] = handle_fork_events(children[0]); + ATF_REQUIRE(children[1] > 0); + + ATF_REQUIRE(ptrace(PT_DETACH, children[0], (caddr_t)1, 0) != -1); + ATF_REQUIRE(ptrace(PT_CONTINUE, children[1], (caddr_t)1, 0) != -1); + + /* + * Should not see any status from the fork parent now, only + * the child. + */ + wpid = wait(&status); + ATF_REQUIRE(wpid == children[1]); + ATF_REQUIRE(WIFEXITED(status)); + ATF_REQUIRE(WEXITSTATUS(status) == 2); + + wpid = wait(&status); + ATF_REQUIRE(wpid == -1); + ATF_REQUIRE(errno == ECHILD); +} + ATF_TP_ADD_TCS(tp) { @@ -408,6 +873,14 @@ ATF_TP_ADD_TCS(tp) ATF_TP_ADD_TC(tp, ptrace__parent_wait_after_attach); ATF_TP_ADD_TC(tp, ptrace__parent_sees_exit_after_child_debugger); ATF_TP_ADD_TC(tp, ptrace__parent_sees_exit_after_unrelated_debugger); + ATF_TP_ADD_TC(tp, ptrace__follow_fork_both_attached); + ATF_TP_ADD_TC(tp, ptrace__follow_fork_child_detached); + ATF_TP_ADD_TC(tp, ptrace__follow_fork_parent_detached); + ATF_TP_ADD_TC(tp, ptrace__follow_fork_both_attached_unrelated_debugger); + ATF_TP_ADD_TC(tp, + ptrace__follow_fork_child_detached_unrelated_debugger); + ATF_TP_ADD_TC(tp, + ptrace__follow_fork_parent_detached_unrelated_debugger); return (atf_no_error()); }
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