/*===========================================================================*
* do_newexec *
*===========================================================================*/
int do_newexec(void)
{
int proc_e, proc_n, allow_setuid;
vir_bytes ptr;
struct mproc *rmp;
struct exec_info args;
int r;
if (who_e != VFS_PROC_NR && who_e != RS_PROC_NR)
return EPERM;
proc_e= m_in.m_lexec_pm_exec_new.endpt;
if (pm_isokendpt(proc_e, &proc_n) != OK) {
panic("do_newexec: got bad endpoint: %d", proc_e);
}
rmp= &mproc[proc_n];
ptr= m_in.m_lexec_pm_exec_new.ptr;
r= sys_datacopy(who_e, ptr, SELF, (vir_bytes)&args, sizeof(args));
if (r != OK)
panic("do_newexec: sys_datacopy failed: %d", r);
allow_setuid = 0; /* Do not allow setuid execution */
rmp->mp_flags &= ~TAINTED; /* By default not tainted */
if (rmp->mp_tracer == NO_TRACER) {
/* Okay, setuid execution is allowed */
allow_setuid = 1;
}
if (allow_setuid && args.allow_setuid) {
rmp->mp_effuid = args.new_uid;
rmp->mp_effgid = args.new_gid;
}
/* A process is considered 'tainted' when it's executing with
* setuid or setgid bit set, or when the real{u,g}id doesn't
* match the eff{u,g}id, respectively. */
if (allow_setuid && args.allow_setuid) {
/* Program has setuid and/or setgid bits set */
rmp->mp_flags |= TAINTED;
} else if (rmp->mp_effuid != rmp->mp_realuid ||
rmp->mp_effgid != rmp->mp_realgid) {
rmp->mp_flags |= TAINTED;
}
/* System will save command line for debugging, ps(1) output, etc. */
strncpy(rmp->mp_name, args.progname, PROC_NAME_LEN-1);
rmp->mp_name[PROC_NAME_LEN-1] = '\0';
/* Save offset to initial argc (for procfs) */
rmp->mp_frame_addr = (vir_bytes) args.stack_high - args.frame_len;
rmp->mp_frame_len = args.frame_len;
/* Kill process if something goes wrong after this point. */
rmp->mp_flags |= PARTIAL_EXEC;
mp->mp_reply.m_pm_lexec_exec_new.suid = (allow_setuid && args.allow_setuid);
return r;
}
/*===========================================================================*
* do_adddma *
*===========================================================================*/
PUBLIC int do_adddma()
{
endpoint_t req_proc_e, target_proc_e;
int proc_n, r;
phys_bytes base, size;
if (mp->mp_effuid != SUPER_USER)
return EPERM;
req_proc_e= m_in.m_source;
target_proc_e= m_in.m2_i1;
base= m_in.m2_l1;
size= m_in.m2_l2;
if((r = vm_adddma(req_proc_e, target_proc_e, base, size)) != OK) {
printf("pm:do_adddma: vm_adddma failed (%d)\n", r);
return r;
}
/* Find target process */
if (pm_isokendpt(target_proc_e, &proc_n) != OK)
{
printf("pm:do_adddma: endpoint %d not found\n", target_proc_e);
return EINVAL;
}
return OK;
}
/*===========================================================================*
* do_exec_newmem *
*===========================================================================*/
PUBLIC int do_exec_newmem()
{
int proc_e, proc_n, allow_setuid;
char *ptr;
struct mproc *rmp;
struct exec_newmem args;
int r, flags;
char *stack_top;
if (who_e != VFS_PROC_NR && who_e != RS_PROC_NR)
return EPERM;
proc_e= m_in.EXC_NM_PROC;
if (pm_isokendpt(proc_e, &proc_n) != OK) {
panic("do_exec_newmem: got bad endpoint: %d", proc_e);
}
rmp= &mproc[proc_n];
ptr= m_in.EXC_NM_PTR;
r= sys_datacopy(who_e, (vir_bytes)ptr,
SELF, (vir_bytes)&args, sizeof(args));
if (r != OK)
panic("do_exec_newmem: sys_datacopy failed: %d", r);
if((r=vm_exec_newmem(proc_e, &args, sizeof(args), &stack_top, &flags)) == OK) {
allow_setuid= 0; /* Do not allow setuid execution */
if (rmp->mp_tracer == NO_TRACER) {
/* Okay, setuid execution is allowed */
allow_setuid= 1;
rmp->mp_effuid = args.new_uid;
rmp->mp_effgid = args.new_gid;
}
/* System will save command line for debugging, ps(1) output, etc. */
strncpy(rmp->mp_name, args.progname, PROC_NAME_LEN-1);
rmp->mp_name[PROC_NAME_LEN-1] = '\0';
/* Save offset to initial argc (for procfs) */
rmp->mp_frame_addr = (vir_bytes) stack_top - args.args_bytes;
rmp->mp_frame_len = args.args_bytes;
/* Kill process if something goes wrong after this point. */
rmp->mp_flags |= PARTIAL_EXEC;
mp->mp_reply.reply_res2= (vir_bytes) stack_top;
mp->mp_reply.reply_res3= flags;
if (allow_setuid)
mp->mp_reply.reply_res3 |= EXC_NM_RF_ALLOW_SETUID;
} else {
printf("PM: newmem failed for %s\n", args.progname);
}
return r;
}
/*===========================================================================*
* do_getepinfo *
*===========================================================================*/
int do_getepinfo(void)
{
struct mproc *rmp;
endpoint_t ep;
int slot;
ep = m_in.m_lsys_pm_getepinfo.endpt;
if (pm_isokendpt(ep, &slot) != OK)
return(ESRCH);
rmp = &mproc[slot];
mp->mp_reply.m_pm_lsys_getepinfo.uid = rmp->mp_effuid;
mp->mp_reply.m_pm_lsys_getepinfo.gid = rmp->mp_effgid;
return(rmp->mp_pid);
}
/*===========================================================================*
* get_work *
*===========================================================================*/
PRIVATE void get_work()
{
/* Wait for the next message and extract useful information from it. */
if (receive(ANY, &m_in) != OK)
panic(__FILE__,"PM receive error", NO_NUM);
who_e = m_in.m_source; /* who sent the message */
if(pm_isokendpt(who_e, &who_p) != OK)
panic(__FILE__, "PM got message from invalid endpoint", who_e);
call_nr = m_in.m_type; /* system call number */
/* Process slot of caller. Misuse PM's own process slot if the kernel is
* calling. This can happen in case of synchronous alarms (CLOCK) or or
* event like pending kernel signals (SYSTEM).
*/
mp = &mproc[who_p < 0 ? PM_PROC_NR : who_p];
if(who_p >= 0 && mp->mp_endpoint != who_e) {
panic(__FILE__, "PM endpoint number out of sync with source",
mp->mp_endpoint);
}
}
/*===========================================================================*
* do_execrestart *
*===========================================================================*/
PUBLIC int do_execrestart()
{
int proc_e, proc_n, result;
struct mproc *rmp;
vir_bytes pc;
if (who_e != RS_PROC_NR)
return EPERM;
proc_e= m_in.EXC_RS_PROC;
if (pm_isokendpt(proc_e, &proc_n) != OK) {
panic("do_execrestart: got bad endpoint: %d", proc_e);
}
rmp= &mproc[proc_n];
result= m_in.EXC_RS_RESULT;
pc= (vir_bytes)m_in.EXC_RS_PC;
exec_restart(rmp, result, pc);
return OK;
}
/*===========================================================================*
* do_execrestart *
*===========================================================================*/
int do_execrestart(void)
{
int proc_e, proc_n, result;
struct mproc *rmp;
vir_bytes pc, ps_str;
if (who_e != RS_PROC_NR)
return EPERM;
proc_e = m_in.m_rs_pm_exec_restart.endpt;
if (pm_isokendpt(proc_e, &proc_n) != OK) {
panic("do_execrestart: got bad endpoint: %d", proc_e);
}
rmp = &mproc[proc_n];
result = m_in.m_rs_pm_exec_restart.result;
pc = m_in.m_rs_pm_exec_restart.pc;
ps_str = m_in.m_rs_pm_exec_restart.ps_str;
exec_restart(rmp, result, pc, rmp->mp_frame_addr, ps_str);
return OK;
}
/*===========================================================================*
* do_execrestart *
*===========================================================================*/
int do_execrestart()
{
int proc_e, proc_n, result;
struct mproc *rmp;
if (who_e != RS_PROC_NR)
return -EPERM;
proc_e= m_in.EXC_RS_PROC;
if (pm_isokendpt(proc_e, &proc_n) != 0) {
panic(__FILE__, "do_execrestart: got bad endpoint",
proc_e);
}
rmp= &mproc[proc_n];
result= m_in.EXC_RS_RESULT;
exec_restart(rmp, result);
return 0;
}
/*===========================================================================*
* process_ksig *
*===========================================================================*/
int process_ksig(endpoint_t proc_nr_e, int signo)
{
register struct mproc *rmp;
int proc_nr;
pid_t proc_id, id;
if(pm_isokendpt(proc_nr_e, &proc_nr) != OK || proc_nr < 0) {
printf("PM: process_ksig: %d?? not ok\n", proc_nr_e);
return EDEADEPT; /* process is gone. */
}
rmp = &mproc[proc_nr];
if ((rmp->mp_flags & (IN_USE | EXITING)) != IN_USE) {
#if 0
printf("PM: process_ksig: %d?? exiting / not in use\n", proc_nr_e);
#endif
return EDEADEPT; /* process is gone. */
}
proc_id = rmp->mp_pid;
mp = &mproc[0]; /* pretend signals are from PM */
mp->mp_procgrp = rmp->mp_procgrp; /* get process group right */
/* For SIGVTALRM and SIGPROF, see if we need to restart a
* virtual timer. For SIGINT, SIGWINCH and SIGQUIT, use proc_id 0
* to indicate a broadcast to the recipient's process group. For
* SIGKILL, use proc_id -1 to indicate a systemwide broadcast.
*/
switch (signo) {
case SIGINT:
case SIGQUIT:
case SIGWINCH:
id = 0; break; /* broadcast to process group */
case SIGVTALRM:
case SIGPROF:
check_vtimer(proc_nr, signo);
/* fall-through */
default:
id = proc_id;
break;
}
check_sig(id, signo, TRUE /* ksig */);
/* If SIGSNDELAY is set, an earlier sys_stop() failed because the process was
* still sending, and the kernel hereby tells us that the process is now done
* with that. We can now try to resume what we planned to do in the first
* place: set up a signal handler. However, the process's message may have
* been a call to PM, in which case the process may have changed any of its
* signal settings. The process may also have forked, exited etcetera.
*/
if (signo == SIGSNDELAY && (rmp->mp_flags & DELAY_CALL)) {
rmp->mp_flags &= ~DELAY_CALL;
/*
* If the VFS_CALL flag is still set we have a process which is stopped
* and we only need to wait for a reply from VFS. We are going to check
* the pending signal then
*/
if (rmp->mp_flags & VFS_CALL)
return OK;
if (rmp->mp_flags & PM_SIG_PENDING)
panic("process_ksig: bad process state");
/* Process as many normal signals as possible. */
check_pending(rmp);
if (rmp->mp_flags & DELAY_CALL)
panic("process_ksig: multiple delay calls?");
}
/* See if the process is still alive */
if ((mproc[proc_nr].mp_flags & (IN_USE | EXITING)) == IN_USE) {
return OK; /* signal has been delivered */
}
else {
return EDEADEPT; /* process is gone */
}
}
/*===========================================================================*
* main *
*===========================================================================*/
int main()
{
/* Main routine of the process manager. */
int result;
/* SEF local startup. */
sef_local_startup();
// Initialization of the semarray (of pointers) to NULL
register struct mproc *rmp;
// rmp is the pointer to the struct of the process table
for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++)
{
for(int i=0; i<12; i++) // for all 12 semaphores
{
rmp->semarray[i]=NULL;
}
}
// end of Initialization
/* This is PM's main loop- get work and do it, forever and forever. */
while (TRUE) {
int ipc_status;
/* Wait for the next message and extract useful information from it. */
if (sef_receive_status(ANY, &m_in, &ipc_status) != OK)
panic("PM sef_receive_status error");
who_e = m_in.m_source; /* who sent the message */
if(pm_isokendpt(who_e, &who_p) != OK)
panic("PM got message from invalid endpoint: %d", who_e);
call_nr = m_in.m_type; /* system call number */
/* Process slot of caller. Misuse PM's own process slot if the kernel is
* calling. This can happen in case of synchronous alarms (CLOCK) or or
* event like pending kernel signals (SYSTEM).
*/
mp = &mproc[who_p < 0 ? PM_PROC_NR : who_p];
if(who_p >= 0 && mp->mp_endpoint != who_e) {
panic("PM endpoint number out of sync with source: %d",
mp->mp_endpoint);
}
/* Drop delayed calls from exiting processes. */
if (mp->mp_flags & EXITING)
continue;
/* Check for system notifications first. Special cases. */
if (is_ipc_notify(ipc_status)) {
if (who_p == CLOCK) {
expire_timers(m_in.NOTIFY_TIMESTAMP);
}
/* done, send reply and continue */
sendreply();
continue;
}
switch(call_nr)
{
case PM_SETUID_REPLY:
case PM_SETGID_REPLY:
case PM_SETSID_REPLY:
case PM_EXEC_REPLY:
case PM_EXIT_REPLY:
case PM_CORE_REPLY:
case PM_FORK_REPLY:
case PM_SRV_FORK_REPLY:
case PM_UNPAUSE_REPLY:
case PM_REBOOT_REPLY:
case PM_SETGROUPS_REPLY:
if (who_e == VFS_PROC_NR)
{
handle_vfs_reply();
result= SUSPEND; /* don't reply */
}
else
result= ENOSYS;
break;
case COMMON_GETSYSINFO:
result = do_getsysinfo();
break;
default:
/* Else, if the system call number is valid, perform the
* call.
*/
if ((unsigned) call_nr >= NCALLS) {
result = ENOSYS;
} else {
#if ENABLE_SYSCALL_STATS
calls_stats[call_nr]++;
#endif
result = (*call_vec[call_nr])();
}
break;
}
/* Send reply. */
if (result != SUSPEND) setreply(who_p, result);
sendreply();
}
return(OK);
}
/*===========================================================================*
* process_ksig *
*===========================================================================*/
int process_ksig(endpoint_t proc_nr_e, int signo)
{
register struct mproc *rmp;
int proc_nr;
pid_t proc_id, id;
if(pm_isokendpt(proc_nr_e, &proc_nr) != OK) {
printf("PM: process_ksig: %d?? not ok\n", proc_nr_e);
return EDEADEPT; /* process is gone. */
}
rmp = &mproc[proc_nr];
if ((rmp->mp_flags & (IN_USE | EXITING)) != IN_USE) {
#if 0
printf("PM: process_ksig: %d?? exiting / not in use\n", proc_nr_e);
#endif
return EDEADEPT; /* process is gone. */
}
proc_id = rmp->mp_pid;
mp = &mproc[0]; /* pretend signals are from PM */
mp->mp_procgrp = rmp->mp_procgrp; /* get process group right */
/* For SIGVTALRM and SIGPROF, see if we need to restart a
* virtual timer. For SIGINT, SIGINFO, SIGWINCH and SIGQUIT, use proc_id 0
* to indicate a broadcast to the recipient's process group. For
* SIGKILL, use proc_id -1 to indicate a systemwide broadcast.
*/
switch (signo) {
case SIGINT:
case SIGQUIT:
case SIGWINCH:
case SIGINFO:
id = 0; break; /* broadcast to process group */
case SIGVTALRM:
case SIGPROF:
check_vtimer(proc_nr, signo);
/* fall-through */
default:
id = proc_id;
break;
}
check_sig(id, signo, TRUE /* ksig */);
/* If SIGSNDELAY is set, an earlier sys_stop() failed because the process was
* still sending, and the kernel hereby tells us that the process is now done
* with that. We can now try to resume what we planned to do in the first
* place: set up a signal handler. However, the process's message may have
* been a call to PM, in which case the process may have changed any of its
* signal settings. The process may also have forked, exited etcetera.
*/
if (signo == SIGSNDELAY && (rmp->mp_flags & DELAY_CALL)) {
/* When getting SIGSNDELAY, the process is stopped at least until the
* receipt of the SIGSNDELAY signal is acknowledged to the kernel. The
* process is not stopped on PROC_STOP in the kernel. However, now that
* there is no longer a delay call, stop_proc() is guaranteed to
* succeed immediately.
*/
rmp->mp_flags &= ~DELAY_CALL;
assert(!(rmp->mp_flags & PROC_STOPPED));
/* If the delay call was to PM, it may have resulted in a VFS call. In
* that case, we must wait with further signal processing until VFS has
* replied. Stop the process.
*/
if (rmp->mp_flags & VFS_CALL) {
stop_proc(rmp, FALSE /*may_delay*/);
return OK;
}
/* Process as many normal signals as possible. */
check_pending(rmp);
assert(!(rmp->mp_flags & DELAY_CALL));
}
/* See if the process is still alive */
if ((mproc[proc_nr].mp_flags & (IN_USE | EXITING)) == IN_USE) {
return OK; /* signal has been delivered */
}
else {
return EDEADEPT; /* process is gone */
}
}
/*===========================================================================*
* main *
*===========================================================================*/
int main()
{
/* Main routine of the process manager. */
unsigned int call_index;
int ipc_status, result;
/* SEF local startup. */
sef_local_startup();
/* This is PM's main loop- get work and do it, forever and forever. */
while (TRUE) {
/* Wait for the next message. */
if (sef_receive_status(ANY, &m_in, &ipc_status) != OK)
panic("PM sef_receive_status error");
/* Check for system notifications first. Special cases. */
if (is_ipc_notify(ipc_status)) {
if (_ENDPOINT_P(m_in.m_source) == CLOCK)
expire_timers(m_in.m_notify.timestamp);
/* done, continue */
continue;
}
/* Extract useful information from the message. */
who_e = m_in.m_source; /* who sent the message */
if (pm_isokendpt(who_e, &who_p) != OK)
panic("PM got message from invalid endpoint: %d", who_e);
mp = &mproc[who_p]; /* process slot of caller */
call_nr = m_in.m_type; /* system call number */
/* Drop delayed calls from exiting processes. */
if (mp->mp_flags & EXITING)
continue;
if (IS_VFS_PM_RS(call_nr) && who_e == VFS_PROC_NR) {
handle_vfs_reply();
result = SUSPEND; /* don't reply */
} else if (call_nr == PROC_EVENT_REPLY) {
result = do_proc_event_reply();
} else if (IS_PM_CALL(call_nr)) {
/* If the system call number is valid, perform the call. */
call_index = (unsigned int) (call_nr - PM_BASE);
if (call_index < NR_PM_CALLS && call_vec[call_index] != NULL) {
#if ENABLE_SYSCALL_STATS
calls_stats[call_index]++;
#endif
result = (*call_vec[call_index])();
} else
result = ENOSYS;
} else
result = ENOSYS;
/* Send reply. */
if (result != SUSPEND) reply(who_p, result);
}
return(OK);
}
/*===========================================================================*
* do_getset *
*===========================================================================*/
PUBLIC int do_getset()
{
/* Handle GETUID, GETGID, GETPID, GETPGRP, SETUID, SETGID, SETSID. The four
* GETs and SETSID return their primary results in 'r'. GETUID, GETGID, and
* GETPID also return secondary results (the effective IDs, or the parent
* process ID) in 'reply_res2', which is returned to the user.
*/
register struct mproc *rmp = mp;
int r, proc;
switch(call_nr) {
case GETUID:
r = rmp->mp_realuid;
rmp->mp_reply.reply_res2 = rmp->mp_effuid;
break;
case GETGID:
r = rmp->mp_realgid;
rmp->mp_reply.reply_res2 = rmp->mp_effgid;
break;
case GETPID:
r = mproc[who_p].mp_pid;
rmp->mp_reply.reply_res2 = mproc[rmp->mp_parent].mp_pid;
if(pm_isokendpt(m_in.endpt, &proc) == OK && proc >= 0)
rmp->mp_reply.reply_res3 = mproc[proc].mp_pid;
break;
case SETEUID:
case SETUID:
if (rmp->mp_realuid != (uid_t) m_in.usr_id &&
rmp->mp_effuid != SUPER_USER)
return(EPERM);
if(call_nr == SETUID) rmp->mp_realuid = (uid_t) m_in.usr_id;
rmp->mp_effuid = (uid_t) m_in.usr_id;
tell_fs(SETUID, who_e, rmp->mp_realuid, rmp->mp_effuid);
r = OK;
break;
case SETEGID:
case SETGID:
if (rmp->mp_realgid != (gid_t) m_in.grp_id &&
rmp->mp_effuid != SUPER_USER)
return(EPERM);
if(call_nr == SETGID) rmp->mp_realgid = (gid_t) m_in.grp_id;
rmp->mp_effgid = (gid_t) m_in.grp_id;
tell_fs(SETGID, who_e, rmp->mp_realgid, rmp->mp_effgid);
r = OK;
break;
case SETSID:
if (rmp->mp_procgrp == rmp->mp_pid) return(EPERM);
rmp->mp_procgrp = rmp->mp_pid;
tell_fs(SETSID, who_e, 0, 0);
/* fall through */
case GETPGRP:
r = rmp->mp_procgrp;
break;
default:
r = EINVAL;
break;
}
return(r);
}
/*
* A subscribing service has replied to a process event message from us, or at
* least that is what should have happened. First make sure of this, and then
* resume event handling for the affected process.
*/
int
do_proc_event_reply(void)
{
struct mproc *rmp;
endpoint_t endpt;
unsigned int i, event;
int slot;
assert(nested == 0);
/*
* Is this an accidental call from a misguided user process?
* Politely tell it to go away.
*/
if (!(mp->mp_flags & PRIV_PROC))
return ENOSYS;
/*
* Ensure that we got the reply that we want. Since this code is
* relatively new, produce lots of warnings for cases that should never
* or rarely occur. Later we can just ignore all mismatching replies.
*/
endpt = m_in.m_pm_lsys_proc_event.endpt;
if (pm_isokendpt(endpt, &slot) != OK) {
printf("PM: proc event reply from %d for invalid endpt %d\n",
who_e, endpt);
return SUSPEND;
}
rmp = &mproc[slot];
if (!(rmp->mp_flags & EVENT_CALL)) {
printf("PM: proc event reply from %d for endpt %d, no event\n",
who_e, endpt);
return SUSPEND;
}
if (rmp->mp_eventsub == NO_EVENTSUB ||
(unsigned int)rmp->mp_eventsub >= nsubs) {
printf("PM: proc event reply from %d for endpt %d index %d\n",
who_e, endpt, rmp->mp_eventsub);
return SUSPEND;
}
i = rmp->mp_eventsub;
if (subs[i].endpt != who_e) {
printf("PM: proc event reply for %d from %d instead of %d\n",
endpt, who_e, subs[i].endpt);
return SUSPEND;
}
if (rmp->mp_flags & EXITING)
event = PROC_EVENT_EXIT;
else if (rmp->mp_flags & UNPAUSED)
event = PROC_EVENT_SIGNAL;
else {
printf("PM: proc event reply from %d for %d, bad flags %x\n",
who_e, endpt, rmp->mp_flags);
return SUSPEND;
}
if (m_in.m_pm_lsys_proc_event.event != event) {
printf("PM: proc event reply from %d for %d for event %d "
"instead of %d\n", who_e, endpt,
m_in.m_pm_lsys_proc_event.event, event);
return SUSPEND;
}
/*
* Do NOT check the event against the subscriber's event mask, since a
* service may have unsubscribed from an event while it has yet to
* process some leftover notifications for that event. We could decide
* not to wait for the replies to those leftover notifications upon
* unsubscription, but that could result in problems upon quick
* resubscription, and such cases may in fact happen in practice.
*/
assert(subs[i].waiting > 0);
subs[i].waiting--;
/*
* If we are now no longer waiting for any replies from an already
* unsubscribed (but alive) service, remove it from the set now; this
* will also resume events for the current process. In the normal case
* however, let the current process move on to the next subscriber if
* there are more, and the actual event otherwise.
*/
if (subs[i].mask == 0 && subs[i].waiting == 0) {
remove_sub(i);
} else {
rmp->mp_eventsub++;
resume_event(rmp);
}
/* In any case, do not reply to this reply message. */
return SUSPEND;
}
/*===========================================================================*
* main *
*===========================================================================*/
PUBLIC int main()
{
/* Main routine of the process manager. */
int result;
/* SEF local startup. */
sef_local_startup();
sched_init(); /* initialize user-space scheduling */
/* This is PM's main loop- get work and do it, forever and forever. */
while (TRUE) {
int ipc_status;
/* Wait for the next message and extract useful information from it. */
if (sef_receive_status(ANY, &m_in, &ipc_status) != OK)
panic("PM sef_receive_status error");
who_e = m_in.m_source; /* who sent the message */
if(pm_isokendpt(who_e, &who_p) != OK)
panic("PM got message from invalid endpoint: %d", who_e);
call_nr = m_in.m_type; /* system call number */
/* Process slot of caller. Misuse PM's own process slot if the kernel is
* calling. This can happen in case of synchronous alarms (CLOCK) or or
* event like pending kernel signals (SYSTEM).
*/
mp = &mproc[who_p < 0 ? PM_PROC_NR : who_p];
if(who_p >= 0 && mp->mp_endpoint != who_e) {
panic("PM endpoint number out of sync with source: %d",
mp->mp_endpoint);
}
/* Drop delayed calls from exiting processes. */
if (mp->mp_flags & EXITING)
continue;
/* Check for system notifications first. Special cases. */
if (is_ipc_notify(ipc_status)) {
switch(who_p) {
case CLOCK:
pm_expire_timers(m_in.NOTIFY_TIMESTAMP);
result = SUSPEND; /* don't reply */
break;
default :
result = ENOSYS;
}
/* done, send reply and continue */
if (result != SUSPEND) setreply(who_p, result);
sendreply();
continue;
}
switch(call_nr)
{
case PM_SETUID_REPLY:
case PM_SETGID_REPLY:
case PM_SETSID_REPLY:
case PM_EXEC_REPLY:
case PM_EXIT_REPLY:
case PM_CORE_REPLY:
case PM_FORK_REPLY:
case PM_SRV_FORK_REPLY:
case PM_UNPAUSE_REPLY:
case PM_REBOOT_REPLY:
case PM_SETGROUPS_REPLY:
/*?????????????????????????????????????????????????????????????????????*/
/*?????????????????????????????????????????????????????????????????????*/
/* Chamando a funcao terminator() para todos os processos finalizados. */
if ( call_nr==PM_EXIT_REPLY ) terminator( _ENDPOINT_P(m_in.m1_i1));
/*?????????????????????????????????????????????????????????????????????*/
/*?????????????????????????????????????????????????????????????????????*/
if (who_e == FS_PROC_NR)
{
handle_fs_reply();
result= SUSPEND; /* don't reply */
}
else
result= ENOSYS;
break;
default:
/* Else, if the system call number is valid, perform the
* call.
*/
if ((unsigned) call_nr >= NCALLS) {
result = ENOSYS;
} else {
#if ENABLE_SYSCALL_STATS
calls_stats[call_nr]++;
#endif
result = (*call_vec[call_nr])();
}
break;
}
/* Send reply. */
if (result != SUSPEND) setreply(who_p, result);
sendreply();
}
return(OK);
}
/*===========================================================================*
* do_getset *
*===========================================================================*/
PUBLIC int do_getset()
{
/* Handle GETUID, GETGID, GETPID, GETPGRP, SETUID, SETGID, SETSID. The four
* GETs and SETSID return their primary results in 'r'. GETUID, GETGID, and
* GETPID also return secondary results (the effective IDs, or the parent
* process ID) in 'reply_res2', which is returned to the user.
*/
register struct mproc *rmp = mp;
int r, proc;
switch(call_nr) {
case GETUID:
r = rmp->mp_realuid;
rmp->mp_reply.reply_res2 = rmp->mp_effuid;
break;
case GETGID:
r = rmp->mp_realgid;
rmp->mp_reply.reply_res2 = rmp->mp_effgid;
break;
case GETPID:
r = mproc[who_p].mp_pid;
rmp->mp_reply.reply_res2 = mproc[rmp->mp_parent].mp_pid;
if(pm_isokendpt(m_in.endpt, &proc) == OK && proc >= 0)
rmp->mp_reply.reply_res3 = mproc[proc].mp_pid;
break;
case SETEUID:
case SETUID:
if (rmp->mp_realuid != (uid_t) m_in.usr_id &&
rmp->mp_effuid != SUPER_USER)
return(EPERM);
if(call_nr == SETUID) rmp->mp_realuid = (uid_t) m_in.usr_id;
rmp->mp_effuid = (uid_t) m_in.usr_id;
if (rmp->mp_fs_call != PM_IDLE)
{
panic(__FILE__, "do_getset: not idle",
rmp->mp_fs_call);
}
rmp->mp_fs_call= PM_SETUID;
r= notify(FS_PROC_NR);
if (r != OK)
panic(__FILE__, "do_getset: unable to notify FS", r);
/* Do not reply until FS is ready to process the setuid
* request
*/
r= SUSPEND;
break;
case SETEGID:
case SETGID:
if (rmp->mp_realgid != (gid_t) m_in.grp_id &&
rmp->mp_effuid != SUPER_USER)
return(EPERM);
if(call_nr == SETGID) rmp->mp_realgid = (gid_t) m_in.grp_id;
rmp->mp_effgid = (gid_t) m_in.grp_id;
if (rmp->mp_fs_call != PM_IDLE)
{
panic(__FILE__, "do_getset: not idle",
rmp->mp_fs_call);
}
rmp->mp_fs_call= PM_SETGID;
r= notify(FS_PROC_NR);
if (r != OK)
panic(__FILE__, "do_getset: unable to notify FS", r);
/* Do not reply until FS is ready to process the setgid
* request
*/
r= SUSPEND;
break;
case SETSID:
if (rmp->mp_procgrp == rmp->mp_pid) return(EPERM);
rmp->mp_procgrp = rmp->mp_pid;
if (rmp->mp_fs_call != PM_IDLE)
{
panic(__FILE__, "do_getset: not idle",
rmp->mp_fs_call);
}
rmp->mp_fs_call= PM_SETSID;
r= notify(FS_PROC_NR);
if (r != OK)
panic(__FILE__, "do_getset: unable to notify FS", r);
/* Do not reply until FS is ready to process the setsid
* request
*/
r= SUSPEND;
break;
case GETPGRP:
r = rmp->mp_procgrp;
break;
default:
r = EINVAL;
break;
}
return(r);
}
