506 lines
14 KiB
C
506 lines
14 KiB
C
/* Miscellaneous system calls. Author: Kees J. Bot
|
|
* 31 Mar 2000
|
|
* The entry points into this file are:
|
|
* do_reboot: kill all processes, then reboot system
|
|
* do_getsysinfo: request copy of PM data structure (Jorrit N. Herder)
|
|
* do_getprocnr: lookup process slot number (Jorrit N. Herder)
|
|
* do_getepinfo: get the pid/uid/gid of a process given its endpoint
|
|
* do_getsetpriority: get/set process priority
|
|
* do_svrctl: process manager control
|
|
*/
|
|
|
|
#define brk _brk
|
|
|
|
#include "pm.h"
|
|
#include <minix/callnr.h>
|
|
#include <signal.h>
|
|
#include <sys/svrctl.h>
|
|
#include <sys/resource.h>
|
|
#include <sys/utsname.h>
|
|
#include <minix/com.h>
|
|
#include <minix/config.h>
|
|
#include <minix/sysinfo.h>
|
|
#include <minix/type.h>
|
|
#include <minix/vm.h>
|
|
#include <string.h>
|
|
#include <machine/archtypes.h>
|
|
#include <lib.h>
|
|
#include <assert.h>
|
|
#include "mproc.h"
|
|
#include "param.h"
|
|
#include "kernel/proc.h"
|
|
|
|
PUBLIC struct utsname uts_val = {
|
|
"Minix", /* system name */
|
|
"noname", /* node/network name */
|
|
OS_RELEASE, /* O.S. release (e.g. 1.5) */
|
|
OS_VERSION, /* O.S. version (e.g. 10) */
|
|
"xyzzy", /* machine (cpu) type (filled in later) */
|
|
#if __i386
|
|
"i386", /* architecture */
|
|
#else
|
|
#error /* oops, no 'uname -mk' */
|
|
#endif
|
|
};
|
|
|
|
PRIVATE char *uts_tbl[] = {
|
|
uts_val.arch,
|
|
NULL, /* No kernel architecture */
|
|
uts_val.machine,
|
|
NULL, /* No hostname */
|
|
uts_val.nodename,
|
|
uts_val.release,
|
|
uts_val.version,
|
|
uts_val.sysname,
|
|
NULL, /* No bus */ /* No bus */
|
|
};
|
|
|
|
#if ENABLE_SYSCALL_STATS
|
|
PUBLIC unsigned long calls_stats[NCALLS];
|
|
#endif
|
|
|
|
/*===========================================================================*
|
|
* do_sysuname *
|
|
*===========================================================================*/
|
|
PUBLIC int do_sysuname()
|
|
{
|
|
/* Set or get uname strings. */
|
|
|
|
int r;
|
|
size_t n;
|
|
char *string;
|
|
#if 0 /* for updates */
|
|
char tmp[sizeof(uts_val.nodename)];
|
|
static short sizes[] = {
|
|
0, /* arch, (0 = read-only) */
|
|
0, /* kernel */
|
|
0, /* machine */
|
|
0, /* sizeof(uts_val.hostname), */
|
|
sizeof(uts_val.nodename),
|
|
0, /* release */
|
|
0, /* version */
|
|
0, /* sysname */
|
|
};
|
|
#endif
|
|
|
|
if ((unsigned) m_in.sysuname_field >= _UTS_MAX) return(EINVAL);
|
|
|
|
string = uts_tbl[m_in.sysuname_field];
|
|
if (string == NULL)
|
|
return EINVAL; /* Unsupported field */
|
|
|
|
switch (m_in.sysuname_req) {
|
|
case _UTS_GET:
|
|
/* Copy an uname string to the user. */
|
|
n = strlen(string) + 1;
|
|
if (n > m_in.sysuname_len) n = m_in.sysuname_len;
|
|
r = sys_vircopy(SELF, D, (phys_bytes) string,
|
|
mp->mp_endpoint, D, (phys_bytes) m_in.sysuname_value,
|
|
(phys_bytes) n);
|
|
if (r < 0) return(r);
|
|
break;
|
|
|
|
#if 0 /* no updates yet */
|
|
case _UTS_SET:
|
|
/* Set an uname string, needs root power. */
|
|
len = sizes[m_in.sysuname_field];
|
|
if (mp->mp_effuid != 0 || len == 0) return(EPERM);
|
|
n = len < m_in.sysuname_len ? len : m_in.sysuname_len;
|
|
if (n <= 0) return(EINVAL);
|
|
r = sys_vircopy(mp->mp_endpoint, D, (phys_bytes) m_in.sysuname_value,
|
|
SELF, D, (phys_bytes) tmp, (phys_bytes) n);
|
|
if (r < 0) return(r);
|
|
tmp[n-1] = 0;
|
|
strcpy(string, tmp);
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
return(EINVAL);
|
|
}
|
|
/* Return the number of bytes moved. */
|
|
return(n);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* do_getsysinfo *
|
|
*===========================================================================*/
|
|
PUBLIC int do_getsysinfo()
|
|
{
|
|
vir_bytes src_addr, dst_addr;
|
|
size_t len;
|
|
|
|
/* This call leaks important information. In the future, requests from
|
|
* non-system processes should be denied.
|
|
*/
|
|
if (mp->mp_effuid != 0)
|
|
{
|
|
printf("PM: unauthorized call of do_getsysinfo by proc %d '%s'\n",
|
|
mp->mp_endpoint, mp->mp_name);
|
|
sys_sysctl_stacktrace(mp->mp_endpoint);
|
|
return EPERM;
|
|
}
|
|
|
|
switch(m_in.SI_WHAT) {
|
|
case SI_PROC_TAB: /* copy entire process table */
|
|
src_addr = (vir_bytes) mproc;
|
|
len = sizeof(struct mproc) * NR_PROCS;
|
|
break;
|
|
#if ENABLE_SYSCALL_STATS
|
|
case SI_CALL_STATS:
|
|
src_addr = (vir_bytes) calls_stats;
|
|
len = sizeof(calls_stats);
|
|
break;
|
|
#endif
|
|
default:
|
|
return(EINVAL);
|
|
}
|
|
|
|
if (len != m_in.SI_SIZE)
|
|
return(EINVAL);
|
|
|
|
dst_addr = (vir_bytes) m_in.SI_WHERE;
|
|
return sys_datacopy(SELF, src_addr, who_e, dst_addr, len);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* do_getprocnr *
|
|
*===========================================================================*/
|
|
PUBLIC int do_getprocnr()
|
|
{
|
|
register struct mproc *rmp;
|
|
static char search_key[PROC_NAME_LEN+1];
|
|
int key_len;
|
|
int s;
|
|
|
|
/* This call should be moved to DS. */
|
|
if (mp->mp_effuid != 0)
|
|
{
|
|
/* For now, allow non-root processes to request their own endpoint. */
|
|
if (m_in.pid < 0 && m_in.namelen == 0) {
|
|
mp->mp_reply.PM_ENDPT = who_e;
|
|
mp->mp_reply.PM_PENDPT = NONE;
|
|
return OK;
|
|
}
|
|
|
|
printf("PM: unauthorized call of do_getprocnr by proc %d\n",
|
|
mp->mp_endpoint);
|
|
sys_sysctl_stacktrace(mp->mp_endpoint);
|
|
return EPERM;
|
|
}
|
|
|
|
#if 0
|
|
printf("PM: do_getprocnr(%d) call from endpoint %d, %s\n",
|
|
m_in.pid, mp->mp_endpoint, mp->mp_name);
|
|
#endif
|
|
|
|
if (m_in.pid >= 0) { /* lookup process by pid */
|
|
if ((rmp = find_proc(m_in.pid)) != NULL) {
|
|
mp->mp_reply.PM_ENDPT = rmp->mp_endpoint;
|
|
#if 0
|
|
printf("PM: pid result: %d\n", rmp->mp_endpoint);
|
|
#endif
|
|
return(OK);
|
|
}
|
|
return(ESRCH);
|
|
} else if (m_in.namelen > 0) { /* lookup process by name */
|
|
key_len = MIN(m_in.namelen, PROC_NAME_LEN);
|
|
if (OK != (s=sys_datacopy(who_e, (vir_bytes) m_in.PMBRK_ADDR,
|
|
SELF, (vir_bytes) search_key, key_len)))
|
|
return(s);
|
|
search_key[key_len] = '\0'; /* terminate for safety */
|
|
for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++) {
|
|
if (((rmp->mp_flags & (IN_USE | EXITING)) == IN_USE) &&
|
|
strncmp(rmp->mp_name, search_key, key_len)==0) {
|
|
mp->mp_reply.PM_ENDPT = rmp->mp_endpoint;
|
|
return(OK);
|
|
}
|
|
}
|
|
return(ESRCH);
|
|
} else { /* return own/parent process number */
|
|
#if 0
|
|
printf("PM: endpt result: %d\n", mp->mp_reply.PM_ENDPT);
|
|
#endif
|
|
mp->mp_reply.PM_ENDPT = who_e;
|
|
mp->mp_reply.PM_PENDPT = mproc[mp->mp_parent].mp_endpoint;
|
|
}
|
|
|
|
return(OK);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* do_getepinfo *
|
|
*===========================================================================*/
|
|
PUBLIC int do_getepinfo()
|
|
{
|
|
register struct mproc *rmp;
|
|
endpoint_t ep;
|
|
|
|
ep = m_in.PM_ENDPT;
|
|
|
|
for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++) {
|
|
if ((rmp->mp_flags & IN_USE) && (rmp->mp_endpoint == ep)) {
|
|
mp->mp_reply.reply_res2 = rmp->mp_effuid;
|
|
mp->mp_reply.reply_res3 = rmp->mp_effgid;
|
|
return(rmp->mp_pid);
|
|
}
|
|
}
|
|
|
|
/* Process not found */
|
|
return(ESRCH);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* do_getepinfo_o *
|
|
*===========================================================================*/
|
|
PUBLIC int do_getepinfo_o()
|
|
{
|
|
register struct mproc *rmp;
|
|
endpoint_t ep;
|
|
|
|
/* This call should be moved to DS. */
|
|
if (mp->mp_effuid != 0) {
|
|
printf("PM: unauthorized call of do_getepinfo_o by proc %d\n",
|
|
mp->mp_endpoint);
|
|
sys_sysctl_stacktrace(mp->mp_endpoint);
|
|
return EPERM;
|
|
}
|
|
|
|
ep = m_in.PM_ENDPT;
|
|
|
|
for (rmp = &mproc[0]; rmp < &mproc[NR_PROCS]; rmp++) {
|
|
if ((rmp->mp_flags & IN_USE) && (rmp->mp_endpoint == ep)) {
|
|
mp->mp_reply.reply_res2 = (short) rmp->mp_effuid;
|
|
mp->mp_reply.reply_res3 = (char) rmp->mp_effgid;
|
|
return(rmp->mp_pid);
|
|
}
|
|
}
|
|
|
|
/* Process not found */
|
|
return(ESRCH);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* do_reboot *
|
|
*===========================================================================*/
|
|
PUBLIC int do_reboot()
|
|
{
|
|
message m;
|
|
|
|
/* Check permission to abort the system. */
|
|
if (mp->mp_effuid != SUPER_USER) return(EPERM);
|
|
|
|
/* See how the system should be aborted. */
|
|
abort_flag = (unsigned) m_in.reboot_flag;
|
|
if (abort_flag >= RBT_INVALID) return(EINVAL);
|
|
if (RBT_MONITOR == abort_flag) {
|
|
int r;
|
|
if(m_in.reboot_strlen >= sizeof(monitor_code))
|
|
return EINVAL;
|
|
if((r = sys_datacopy(who_e, (vir_bytes) m_in.reboot_code,
|
|
SELF, (vir_bytes) monitor_code, m_in.reboot_strlen)) != OK)
|
|
return r;
|
|
monitor_code[m_in.reboot_strlen] = '\0';
|
|
}
|
|
else
|
|
monitor_code[0] = '\0';
|
|
|
|
/* Order matters here. When VFS is told to reboot, it exits all its
|
|
* processes, and then would be confused if they're exited again by
|
|
* SIGKILL. So first kill, then reboot.
|
|
*/
|
|
|
|
check_sig(-1, SIGKILL, FALSE /* ksig*/); /* kill all users except init */
|
|
sys_stop(INIT_PROC_NR); /* stop init, but keep it around */
|
|
|
|
/* Tell VFS to reboot */
|
|
m.m_type = PM_REBOOT;
|
|
|
|
tell_vfs(&mproc[VFS_PROC_NR], &m);
|
|
|
|
return(SUSPEND); /* don't reply to caller */
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* do_getsetpriority *
|
|
*===========================================================================*/
|
|
PUBLIC int do_getsetpriority()
|
|
{
|
|
int r, arg_which, arg_who, arg_pri;
|
|
struct mproc *rmp;
|
|
|
|
arg_which = m_in.m1_i1;
|
|
arg_who = m_in.m1_i2;
|
|
arg_pri = m_in.m1_i3; /* for SETPRIORITY */
|
|
|
|
/* Code common to GETPRIORITY and SETPRIORITY. */
|
|
|
|
/* Only support PRIO_PROCESS for now. */
|
|
if (arg_which != PRIO_PROCESS)
|
|
return(EINVAL);
|
|
|
|
if (arg_who == 0)
|
|
rmp = mp;
|
|
else
|
|
if ((rmp = find_proc(arg_who)) == NULL)
|
|
return(ESRCH);
|
|
|
|
if (mp->mp_effuid != SUPER_USER &&
|
|
mp->mp_effuid != rmp->mp_effuid && mp->mp_effuid != rmp->mp_realuid)
|
|
return EPERM;
|
|
|
|
/* If GET, that's it. */
|
|
if (call_nr == GETPRIORITY) {
|
|
return(rmp->mp_nice - PRIO_MIN);
|
|
}
|
|
|
|
/* Only root is allowed to reduce the nice level. */
|
|
if (rmp->mp_nice > arg_pri && mp->mp_effuid != SUPER_USER)
|
|
return(EACCES);
|
|
|
|
/* We're SET, and it's allowed.
|
|
*
|
|
* The value passed in is currently between PRIO_MIN and PRIO_MAX.
|
|
* We have to scale this between MIN_USER_Q and MAX_USER_Q to match
|
|
* the kernel's scheduling queues.
|
|
*/
|
|
|
|
if ((r = sched_nice(rmp, arg_pri)) != OK) {
|
|
return r;
|
|
}
|
|
|
|
rmp->mp_nice = arg_pri;
|
|
return(OK);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* do_svrctl *
|
|
*===========================================================================*/
|
|
PUBLIC int do_svrctl()
|
|
{
|
|
int s, req;
|
|
vir_bytes ptr;
|
|
#define MAX_LOCAL_PARAMS 2
|
|
static struct {
|
|
char name[30];
|
|
char value[30];
|
|
} local_param_overrides[MAX_LOCAL_PARAMS];
|
|
static int local_params = 0;
|
|
|
|
req = m_in.svrctl_req;
|
|
ptr = (vir_bytes) m_in.svrctl_argp;
|
|
|
|
/* Is the request indeed for the PM? */
|
|
if (((req >> 8) & 0xFF) != 'M') return(EINVAL);
|
|
|
|
/* Control operations local to the PM. */
|
|
switch(req) {
|
|
case PMSETPARAM:
|
|
case PMGETPARAM: {
|
|
struct sysgetenv sysgetenv;
|
|
char search_key[64];
|
|
char *val_start;
|
|
size_t val_len;
|
|
size_t copy_len;
|
|
|
|
/* Copy sysgetenv structure to PM. */
|
|
if (sys_datacopy(who_e, ptr, SELF, (vir_bytes) &sysgetenv,
|
|
sizeof(sysgetenv)) != OK) return(EFAULT);
|
|
|
|
/* Set a param override? */
|
|
if (req == PMSETPARAM) {
|
|
if (local_params >= MAX_LOCAL_PARAMS) return ENOSPC;
|
|
if (sysgetenv.keylen <= 0
|
|
|| sysgetenv.keylen >=
|
|
sizeof(local_param_overrides[local_params].name)
|
|
|| sysgetenv.vallen <= 0
|
|
|| sysgetenv.vallen >=
|
|
sizeof(local_param_overrides[local_params].value))
|
|
return EINVAL;
|
|
|
|
if ((s = sys_datacopy(who_e, (vir_bytes) sysgetenv.key,
|
|
SELF, (vir_bytes) local_param_overrides[local_params].name,
|
|
sysgetenv.keylen)) != OK)
|
|
return s;
|
|
if ((s = sys_datacopy(who_e, (vir_bytes) sysgetenv.val,
|
|
SELF, (vir_bytes) local_param_overrides[local_params].value,
|
|
sysgetenv.vallen)) != OK)
|
|
return s;
|
|
local_param_overrides[local_params].name[sysgetenv.keylen] = '\0';
|
|
local_param_overrides[local_params].value[sysgetenv.vallen] = '\0';
|
|
|
|
local_params++;
|
|
|
|
return OK;
|
|
}
|
|
|
|
if (sysgetenv.keylen == 0) { /* copy all parameters */
|
|
val_start = monitor_params;
|
|
val_len = sizeof(monitor_params);
|
|
}
|
|
else { /* lookup value for key */
|
|
int p;
|
|
/* Try to get a copy of the requested key. */
|
|
if (sysgetenv.keylen > sizeof(search_key)) return(EINVAL);
|
|
if ((s = sys_datacopy(who_e, (vir_bytes) sysgetenv.key,
|
|
SELF, (vir_bytes) search_key, sysgetenv.keylen)) != OK)
|
|
return(s);
|
|
|
|
/* Make sure key is null-terminated and lookup value.
|
|
* First check local overrides.
|
|
*/
|
|
search_key[sysgetenv.keylen-1]= '\0';
|
|
for(p = 0; p < local_params; p++) {
|
|
if (!strcmp(search_key, local_param_overrides[p].name)) {
|
|
val_start = local_param_overrides[p].value;
|
|
break;
|
|
}
|
|
}
|
|
if (p >= local_params && (val_start = find_param(search_key)) == NULL)
|
|
return(ESRCH);
|
|
val_len = strlen(val_start) + 1;
|
|
}
|
|
|
|
/* See if it fits in the client's buffer. */
|
|
if (val_len > sysgetenv.vallen)
|
|
return E2BIG;
|
|
|
|
/* Value found, make the actual copy (as far as possible). */
|
|
copy_len = MIN(val_len, sysgetenv.vallen);
|
|
if ((s=sys_datacopy(SELF, (vir_bytes) val_start,
|
|
who_e, (vir_bytes) sysgetenv.val, copy_len)) != OK)
|
|
return(s);
|
|
|
|
return OK;
|
|
}
|
|
|
|
default:
|
|
return(EINVAL);
|
|
}
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* _brk *
|
|
*===========================================================================*/
|
|
|
|
extern char *_brksize;
|
|
PUBLIC int brk(brk_addr)
|
|
#ifdef __NBSD_LIBC
|
|
void *brk_addr;
|
|
#else
|
|
char *brk_addr;
|
|
#endif
|
|
{
|
|
int r;
|
|
/* PM wants to call brk() itself. */
|
|
if((r=vm_brk(PM_PROC_NR, brk_addr)) != OK) {
|
|
#if 0
|
|
printf("PM: own brk(%p) failed: vm_brk() returned %d\n",
|
|
brk_addr, r);
|
|
#endif
|
|
return -1;
|
|
}
|
|
_brksize = brk_addr;
|
|
return 0;
|
|
}
|