/*
* continue the child until the run time linker has loaded in all
* the loadobjects (rtld sync point)
*/
static prb_status_t
sync_child(int childpid, volatile shmem_msg_t *smp, prb_proc_ctl_t **proc_pp)
{
prb_proc_ctl_t *proc_p, *oldproc_p;
prb_status_t prbstat = PRB_STATUS_OK;
prb_status_t tempstat;
prb_proc_state_t pstate;
prbstat = prb_proc_open(childpid, proc_pp);
if (prbstat)
return (prbstat);
proc_p = *proc_pp;
prbstat = prb_proc_stop(proc_p);
if (prbstat)
goto ret_failure;
/*
* default is to kill-on-last-close. In case we cannot sync with
* target, we don't want the target to continue.
*/
prbstat = prb_proc_setrlc(proc_p, B_FALSE);
if (prbstat)
goto ret_failure;
prbstat = prb_proc_setklc(proc_p, B_TRUE);
if (prbstat)
goto ret_failure;
/* REMIND: do we have to wait on SYS_exec also ? */
prbstat = prb_proc_exit(proc_p, SYS_execve, PRB_SYS_ADD);
if (prbstat)
goto ret_failure;
prbstat = prb_proc_entry(proc_p, SYS_exit, PRB_SYS_ADD);
if (prbstat)
goto ret_failure;
prbstat = prb_shmem_clear(smp);
if (prbstat)
goto ret_failure;
prbstat = prb_proc_cont(proc_p);
if (prbstat)
goto ret_failure;
prbstat = prb_proc_wait(proc_p, B_FALSE, NULL);
switch (prbstat) {
case PRB_STATUS_OK:
break;
case EAGAIN:
/*
* If we had exec'ed a setuid/setgid program PIOCWSTOP
* will return EAGAIN. Reopen the 'fd' and try again.
* Read the last section of /proc man page - we reopen first
* and then close the old fd.
*/
oldproc_p = proc_p;
tempstat = prb_proc_reopen(childpid, proc_pp);
proc_p = *proc_pp;
if (tempstat) {
/* here EACCES means exec'ed a setuid/setgid program */
(void) prb_proc_close(oldproc_p);
return (tempstat);
}
(void) prb_proc_close(oldproc_p);
break;
default:
goto ret_failure;
}
prbstat = prb_shmem_free(smp);
if (prbstat)
goto ret_failure;
prbstat = prb_proc_state(proc_p, &pstate);
if (prbstat)
goto ret_failure;
if (pstate.ps_issysexit && (pstate.ps_syscallnum == SYS_execve)) {
/* expected condition */
prbstat = PRB_STATUS_OK;
} else {
prbstat = prb_status_map(ENOENT);
goto ret_failure;
}
/* clear old interest mask */
prbstat = prb_proc_exit(proc_p, 0, PRB_SYS_NONE);
if (prbstat)
goto ret_failure;
prbstat = prb_proc_entry(proc_p, 0, PRB_SYS_NONE);
if (prbstat)
goto ret_failure;
/* Successful return */
return (PRB_STATUS_OK);
ret_failure:
(void) prb_proc_close(proc_p);
return (prbstat);
}
/*
* prb_rtld_wait() - waits on target to execute getpid()
*/
static prb_status_t
prb_rtld_wait(prb_proc_ctl_t *proc_p)
{
prb_proc_state_t pstate;
prb_status_t prbstat;
DBG_TNF_PROBE_0(prb_rtld_wait_1, "libtnfctl", "sunw%verbosity 2");
/* stop on exit of getpid() */
prbstat = prb_proc_exit(proc_p, SYS_getpid, PRB_SYS_ADD);
if (prbstat) {
DBG((void) fprintf(stderr,
"prb_rtld_wait: couldn't set up child to stop on "
"exit of getpid(): %s\n", prb_status_str(prbstat)));
return (prbstat);
}
/* stop on entry of exit() - i.e. exec failed */
prbstat = prb_proc_entry(proc_p, SYS_exit, PRB_SYS_ADD);
if (prbstat) {
DBG((void) fprintf(stderr,
"prb_rtld_wait: couldn't set up child to stop on "
"entry of exit(): %s\n", prb_status_str(prbstat)));
return (prbstat);
}
/* continue target and wait for it to stop */
prbstat = prb_proc_cont(proc_p);
if (prbstat) {
DBG((void) fprintf(stderr,
"prb_rtld_wait: couldn't continue target process: %s\n",
prb_status_str(prbstat)));
return (prbstat);
}
/* wait for target to stop */
prbstat = prb_proc_wait(proc_p, B_FALSE, NULL);
if (prbstat) {
DBG((void) fprintf(stderr,
"prb_rtld_wait: couldn't wait on target process: %s\n",
prb_status_str(prbstat)));
return (prbstat);
}
/* make sure it did stop on getpid() */
prbstat = prb_proc_state(proc_p, &pstate);
if (prbstat) {
DBG((void) fprintf(stderr,
"prb_rtld_wait: couldn't get state of target: %s\n",
prb_status_str(prbstat)));
return (prbstat);
}
if (pstate.ps_issysentry && (pstate.ps_syscallnum == SYS_exit)) {
DBG((void) fprintf(stderr, "prb_rtld_wait: target exited\n"));
return (prb_status_map(EACCES));
}
/* catch any other errors */
if (!(pstate.ps_issysexit && (pstate.ps_syscallnum == SYS_getpid))) {
DBG((void) fprintf(stderr,
"prb_rtld_wait: target didn't stop on getpid\n"));
return (PRB_STATUS_BADSYNC);
}
/* clear wait on getpid */
prbstat = prb_proc_exit(proc_p, SYS_getpid, PRB_SYS_DEL);
if (prbstat) {
DBG((void) fprintf(stderr,
"prb_rtld_wait: couldn't clear child to stop on "
"exit of getpid(): %s\n", prb_status_str(prbstat)));
return (prbstat);
}
/* clear wait on exit */
prbstat = prb_proc_entry(proc_p, SYS_exit, PRB_SYS_DEL);
if (prbstat) {
DBG((void) fprintf(stderr,
"prb_rtld_wait: couldn't clear child to stop on "
"entry of exit(): %s\n", prb_status_str(prbstat)));
return (prbstat);
}
/* start-stop the process to clear it out of the system call */
prbstat = prb_proc_prstop(proc_p);
if (prbstat) {
DBG((void) fprintf(stderr,
"prb_rtld_wait: couldn't prstop child: %s\n",
prb_status_str(prbstat)));
return (prbstat);
}
return (PRB_STATUS_OK);
}