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Add new tests attach6 and attach7 in t_wait_proc{4,6,id,pid} 

attach6:
    Assert that tracer sees its parent when attached to tracer (check
    sysctl(7) and struct kinfo_proc2)

attach7:
    Assert that tracer sees its parent when attached to tracer (check
    /proc/curproc/status 3rd column).

Currently these tests fail as getppid() and parent id obtained in these
alternative ways differ.

Sponsored by <The NetBSD Foundation>
This commit is contained in:
kamil 2016-11-14 04:55:57 +00:00
parent c2f4bfe351
commit 0bdd8fbaba
1 changed files with 339 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

346
tests/kernel/t_ptrace_wait.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: t_ptrace_wait.c,v 1.12 2016/11/14 00:18:33 kamil Exp $ */
/* $NetBSD: t_ptrace_wait.c,v 1.13 2016/11/14 04:55:57 kamil Exp $ */
/*-
* Copyright (c) 2016 The NetBSD Foundation, Inc.
@ -27,12 +27,13 @@
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: t_ptrace_wait.c,v 1.12 2016/11/14 00:18:33 kamil Exp $");
__RCSID("$NetBSD: t_ptrace_wait.c,v 1.13 2016/11/14 04:55:57 kamil Exp $");
#include <sys/param.h>
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/wait.h>
#include <err.h>
@ -1008,7 +1009,8 @@ ATF_TC(attach5);
ATF_TC_HEAD(attach5, tc)
{
atf_tc_set_md_var(tc, "descr",
"Assert that tracer sees its parent when attached to tracer");
"Assert that tracer sees its parent when attached to tracer "
"(check getppid(2))");
}
ATF_TC_BODY(attach5, tc)
@ -1024,10 +1026,6 @@ ATF_TC_BODY(attach5, tc)
int status;
#endif
/*
* Tracee process cannot see its appropriate parent when debugged by a
* tracer
*/
printf("Spawn tracee\n");
ATF_REQUIRE(pipe(fds_totracee) == 0);
ATF_REQUIRE(pipe(fds_fromtracee) == 0);
@ -1157,6 +1155,338 @@ ATF_TC_BODY(attach5, tc)
}
#endif
#if defined(TWAIT_HAVE_PID)
ATF_TC(attach6);
ATF_TC_HEAD(attach6, tc)
{
atf_tc_set_md_var(tc, "descr",
"Assert that tracer sees its parent when attached to tracer "
"(check sysctl(7) and struct kinfo_proc2)");
}
ATF_TC_BODY(attach6, tc)
{
int fds_totracee[2], fds_fromtracee[2];
int fds_totracer[2], fds_fromtracer[2];
int rv;
const int exitval_tracee = 5;
const int exitval_tracer = 10;
pid_t parent, tracee, tracer, wpid;
uint8_t msg = 0xde; /* dummy message for IPC based on pipe(2) */
#if defined(TWAIT_HAVE_STATUS)
int status;
#endif
int name[CTL_MAXNAME];
struct kinfo_proc2 kp;
size_t len = sizeof(kp);
unsigned int namelen;
printf("Spawn tracee\n");
ATF_REQUIRE(pipe(fds_totracee) == 0);
ATF_REQUIRE(pipe(fds_fromtracee) == 0);
tracee = atf_utils_fork();
if (tracee == 0) {
FORKEE_ASSERT(close(fds_totracee[1]) == 0);
FORKEE_ASSERT(close(fds_fromtracee[0]) == 0);
parent = getppid();
/* Emit message to the parent */
rv = write(fds_fromtracee[1], &msg, sizeof(msg));
FORKEE_ASSERT(rv == sizeof(msg));
rv = read(fds_totracee[0], &msg, sizeof(msg));
FORKEE_ASSERT(rv == sizeof(msg));
rv = write(fds_fromtracee[1], &msg, sizeof(msg));
FORKEE_ASSERT(rv == sizeof(msg));
/* Wait for message from the parent */
rv = read(fds_totracee[0], &msg, sizeof(msg));
FORKEE_ASSERT(rv == sizeof(msg));
namelen = 0;
name[namelen++] = CTL_KERN;
name[namelen++] = KERN_PROC2;
name[namelen++] = KERN_PROC_PID;
name[namelen++] = getpid();
name[namelen++] = len;
name[namelen++] = 1;
FORKEE_ASSERT(sysctl(name, namelen, &kp, &len, NULL, 0) == 0);
FORKEE_ASSERT_EQ(parent, kp.p_ppid);
_exit(exitval_tracee);
}
ATF_REQUIRE(close(fds_totracee[0]) == 0);
ATF_REQUIRE(close(fds_fromtracee[1]) == 0);
printf("Wait for child to record its parent identifier (pid)\n");
rv = read(fds_fromtracee[0], &msg, sizeof(msg));
FORKEE_ASSERT(rv == sizeof(msg));
rv = write(fds_totracee[1], &msg, sizeof(msg));
FORKEE_ASSERT(rv == sizeof(msg));
rv = read(fds_fromtracee[0], &msg, sizeof(msg));
FORKEE_ASSERT(rv == sizeof(msg));
printf("Spawn debugger\n");
ATF_REQUIRE(pipe(fds_totracer) == 0);
ATF_REQUIRE(pipe(fds_fromtracer) == 0);
tracer = atf_utils_fork();
if (tracer == 0) {
/* No IPC to communicate with the child */
FORKEE_ASSERT(close(fds_totracee[1]) == 0);
FORKEE_ASSERT(close(fds_fromtracee[0]) == 0);
FORKEE_ASSERT(close(fds_totracer[1]) == 0);
FORKEE_ASSERT(close(fds_fromtracer[0]) == 0);
printf("Before calling PT_ATTACH from tracee %d\n", getpid());
FORKEE_ASSERT(ptrace(PT_ATTACH, tracee, NULL, 0) != -1);
/* Wait for tracee and assert that it was stopped w/ SIGSTOP */
FORKEE_REQUIRE_SUCCESS(
wpid = TWAIT_GENERIC(tracee, &status, 0), tracee);
forkee_status_stopped(status, SIGSTOP);
/* Resume tracee with PT_CONTINUE */
FORKEE_ASSERT(ptrace(PT_CONTINUE, tracee, (void *)1, 0) != -1);
/* Inform parent that tracer has attached to tracee */
rv = write(fds_fromtracer[1], &msg, sizeof(msg));
FORKEE_ASSERT(rv == sizeof(msg));
/* Wait for parent */
rv = read(fds_totracer[0], &msg, sizeof(msg));
FORKEE_ASSERT(rv == sizeof(msg));
/* Wait for tracee and assert that it exited */
FORKEE_REQUIRE_SUCCESS(
wpid = TWAIT_GENERIC(tracee, &status, 0), tracee);
forkee_status_exited(status, exitval_tracee);
printf("Before exiting of the tracer process\n");
_exit(exitval_tracer);
}
ATF_REQUIRE(close(fds_totracer[0]) == 0);
ATF_REQUIRE(close(fds_fromtracer[1]) == 0);
printf("Wait for the tracer to attach to the tracee\n");
rv = read(fds_fromtracer[0], &msg, sizeof(msg));
ATF_REQUIRE(rv == sizeof(msg));
printf("Resume the tracee and let it exit\n");
rv = write(fds_totracee[1], &msg, sizeof(msg));
ATF_REQUIRE(rv == sizeof(msg));
printf("fds_totracee is no longer needed - close it\n");
ATF_REQUIRE(close(fds_totracee[1]) == 0);
printf("fds_fromtracee is no longer needed - close it\n");
ATF_REQUIRE(close(fds_fromtracee[0]) == 0);
printf("Detect that tracee is zombie\n");
await_zombie(tracee);
printf("Assert that there is no status about tracee - "
"Tracer must detect zombie first - calling %s()\n", TWAIT_FNAME);
TWAIT_REQUIRE_SUCCESS(
wpid = TWAIT_GENERIC(tracee, &status, WNOHANG), 0);
printf("Resume the tracer and let it detect exited tracee\n");
rv = write(fds_totracer[1], &msg, sizeof(msg));
ATF_REQUIRE(rv == sizeof(msg));
printf("Wait for tracer to finish its job and exit - calling %s()\n",
TWAIT_FNAME);
TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(tracer, &status, 0),
tracer);
validate_status_exited(status, exitval_tracer);
printf("Wait for tracee to finish its job and exit - calling %s()\n",
TWAIT_FNAME);
TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(tracee, &status, WNOHANG),
tracee);
validate_status_exited(status, exitval_tracee);
printf("fds_fromtracer is no longer needed - close it\n");
ATF_REQUIRE(close(fds_fromtracer[0]) == 0);
printf("fds_totracer is no longer needed - close it\n");
ATF_REQUIRE(close(fds_totracer[1]) == 0);
}
#endif
#if defined(TWAIT_HAVE_PID)
ATF_TC(attach7);
ATF_TC_HEAD(attach7, tc)
{
atf_tc_set_md_var(tc, "descr",
"Assert that tracer sees its parent when attached to tracer "
"(check /proc/curproc/status 3rd column)");
}
ATF_TC_BODY(attach7, tc)
{
int fds_totracee[2], fds_fromtracee[2];
int fds_totracer[2], fds_fromtracer[2];
int rv;
const int exitval_tracee = 5;
const int exitval_tracer = 10;
pid_t parent, tracee, tracer, wpid;
uint8_t msg = 0xde; /* dummy message for IPC based on pipe(2) */
#if defined(TWAIT_HAVE_STATUS)
int status;
#endif
FILE *fp;
struct stat st;
const char *fname = "/proc/curproc/status";
char s_executable[MAXPATHLEN];
int s_pid, s_ppid;
/*
* Format:
* EXECUTABLE PID PPID ...
*/
ATF_REQUIRE((rv = stat(fname, &st)) == 0 || (errno == ENOENT));
if (rv != 0) {
atf_tc_skip("/proc/curproc/stat not found");
}
printf("Spawn tracee\n");
ATF_REQUIRE(pipe(fds_totracee) == 0);
ATF_REQUIRE(pipe(fds_fromtracee) == 0);
tracee = atf_utils_fork();
if (tracee == 0) {
FORKEE_ASSERT(close(fds_totracee[1]) == 0);
FORKEE_ASSERT(close(fds_fromtracee[0]) == 0);
parent = getppid();
/* Emit message to the parent */
rv = write(fds_fromtracee[1], &msg, sizeof(msg));
FORKEE_ASSERT(rv == sizeof(msg));
rv = read(fds_totracee[0], &msg, sizeof(msg));
FORKEE_ASSERT(rv == sizeof(msg));
rv = write(fds_fromtracee[1], &msg, sizeof(msg));
FORKEE_ASSERT(rv == sizeof(msg));
/* Wait for message from the parent */
rv = read(fds_totracee[0], &msg, sizeof(msg));
FORKEE_ASSERT(rv == sizeof(msg));
FORKEE_ASSERT((fp = fopen(fname, "r")) != NULL);
fscanf(fp, "%s %d %d", s_executable, &s_pid, &s_ppid);
FORKEE_ASSERT(fclose(fp) == 0);
FORKEE_ASSERT_EQ(parent, s_ppid);
_exit(exitval_tracee);
}
ATF_REQUIRE(close(fds_totracee[0]) == 0);
ATF_REQUIRE(close(fds_fromtracee[1]) == 0);
printf("Wait for child to record its parent identifier (pid)\n");
rv = read(fds_fromtracee[0], &msg, sizeof(msg));
FORKEE_ASSERT(rv == sizeof(msg));
rv = write(fds_totracee[1], &msg, sizeof(msg));
FORKEE_ASSERT(rv == sizeof(msg));
rv = read(fds_fromtracee[0], &msg, sizeof(msg));
FORKEE_ASSERT(rv == sizeof(msg));
printf("Spawn debugger\n");
ATF_REQUIRE(pipe(fds_totracer) == 0);
ATF_REQUIRE(pipe(fds_fromtracer) == 0);
tracer = atf_utils_fork();
if (tracer == 0) {
/* No IPC to communicate with the child */
FORKEE_ASSERT(close(fds_totracee[1]) == 0);
FORKEE_ASSERT(close(fds_fromtracee[0]) == 0);
FORKEE_ASSERT(close(fds_totracer[1]) == 0);
FORKEE_ASSERT(close(fds_fromtracer[0]) == 0);
printf("Before calling PT_ATTACH from tracee %d\n", getpid());
FORKEE_ASSERT(ptrace(PT_ATTACH, tracee, NULL, 0) != -1);
/* Wait for tracee and assert that it was stopped w/ SIGSTOP */
FORKEE_REQUIRE_SUCCESS(
wpid = TWAIT_GENERIC(tracee, &status, 0), tracee);
forkee_status_stopped(status, SIGSTOP);
/* Resume tracee with PT_CONTINUE */
FORKEE_ASSERT(ptrace(PT_CONTINUE, tracee, (void *)1, 0) != -1);
/* Inform parent that tracer has attached to tracee */
rv = write(fds_fromtracer[1], &msg, sizeof(msg));
FORKEE_ASSERT(rv == sizeof(msg));
/* Wait for parent */
rv = read(fds_totracer[0], &msg, sizeof(msg));
FORKEE_ASSERT(rv == sizeof(msg));
/* Wait for tracee and assert that it exited */
FORKEE_REQUIRE_SUCCESS(
wpid = TWAIT_GENERIC(tracee, &status, 0), tracee);
forkee_status_exited(status, exitval_tracee);
printf("Before exiting of the tracer process\n");
_exit(exitval_tracer);
}
ATF_REQUIRE(close(fds_totracer[0]) == 0);
ATF_REQUIRE(close(fds_fromtracer[1]) == 0);
printf("Wait for the tracer to attach to the tracee\n");
rv = read(fds_fromtracer[0], &msg, sizeof(msg));
ATF_REQUIRE(rv == sizeof(msg));
printf("Resume the tracee and let it exit\n");
rv = write(fds_totracee[1], &msg, sizeof(msg));
ATF_REQUIRE(rv == sizeof(msg));
printf("fds_totracee is no longer needed - close it\n");
ATF_REQUIRE(close(fds_totracee[1]) == 0);
printf("fds_fromtracee is no longer needed - close it\n");
ATF_REQUIRE(close(fds_fromtracee[0]) == 0);
printf("Detect that tracee is zombie\n");
await_zombie(tracee);
printf("Assert that there is no status about tracee - "
"Tracer must detect zombie first - calling %s()\n", TWAIT_FNAME);
TWAIT_REQUIRE_SUCCESS(
wpid = TWAIT_GENERIC(tracee, &status, WNOHANG), 0);
printf("Resume the tracer and let it detect exited tracee\n");
rv = write(fds_totracer[1], &msg, sizeof(msg));
ATF_REQUIRE(rv == sizeof(msg));
printf("Wait for tracer to finish its job and exit - calling %s()\n",
TWAIT_FNAME);
TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(tracer, &status, 0),
tracer);
validate_status_exited(status, exitval_tracer);
printf("Wait for tracee to finish its job and exit - calling %s()\n",
TWAIT_FNAME);
TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(tracee, &status, WNOHANG),
tracee);
validate_status_exited(status, exitval_tracee);
printf("fds_fromtracer is no longer needed - close it\n");
ATF_REQUIRE(close(fds_fromtracer[0]) == 0);
printf("fds_totracer is no longer needed - close it\n");
ATF_REQUIRE(close(fds_totracer[1]) == 0);
}
#endif
#if defined(TWAIT_HAVE_PID)
#define ATF_TP_ADD_TC_HAVE_PID(a,b) ATF_TP_ADD_TC(a,b)
#else
@ -1177,6 +1507,8 @@ ATF_TP_ADD_TCS(tp)
ATF_TP_ADD_TC(tp, attach3);
ATF_TP_ADD_TC(tp, attach4);
ATF_TP_ADD_TC_HAVE_PID(tp, attach5);
ATF_TP_ADD_TC_HAVE_PID(tp, attach6);
ATF_TP_ADD_TC_HAVE_PID(tp, attach7);
return atf_no_error();
}