summaryrefslogtreecommitdiffstats
path: root/kernel/sys.c
blob: 706e3d66efc4150d5e46a215849e48700fa41641 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
/*
 *  linux/kernel/sys.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

#include <linux/config.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/times.h>
#include <linux/utsname.h>
#include <linux/param.h>
#include <linux/resource.h>
#include <linux/signal.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/stat.h>
#include <linux/mman.h>

#include <asm/segment.h>
#include <asm/io.h>

/*
 * this indicates whether you can reboot with ctrl-alt-del: the default is yes
 */
static int C_A_D = 1;

extern void adjust_clock(void);

#define	PZERO	15

asmlinkage int sys_ni_syscall(void)
{
	return -EINVAL;
}

asmlinkage int sys_idle(void)
{
	int i;

	if (current->pid != 0)
		return -EPERM;

#ifdef __i386__
	/* Map out the low memory: it's no longer needed */
	for (i = 0 ; i < 768 ; i++)
		swapper_pg_dir[i] = 0;
#endif

	/* endless idle loop with no priority at all */
	current->counter = -100;
	for (;;) {
#if defined (__i386__)
		if (hlt_works_ok && !need_resched)
			__asm__("hlt");
#elif defined (__mips__)
		/*
		 * R4[26]00 have wait, the R4000 doesn't.
		 * Dunno about the R4400...
		 */
		if (!need_resched)
			__asm__("wait");
#endif
		schedule();
	}
}

static int proc_sel(struct task_struct *p, int which, int who)
{
	switch (which) {
		case PRIO_PROCESS:
			if (!who && p == current)
				return 1;
			return(p->pid == who);
		case PRIO_PGRP:
			if (!who)
				who = current->pgrp;
			return(p->pgrp == who);
		case PRIO_USER:
			if (!who)
				who = current->uid;
			return(p->uid == who);
	}
	return 0;
}

asmlinkage int sys_setpriority(int which, int who, int niceval)
{
	struct task_struct **p;
	int error = ESRCH;
	int priority;

	if (which > 2 || which < 0)
		return -EINVAL;

	if ((priority = PZERO - niceval) <= 0)
		priority = 1;

	for(p = &LAST_TASK; p > &FIRST_TASK; --p) {
		if (!*p || !proc_sel(*p, which, who))
			continue;
		if ((*p)->uid != current->euid &&
			(*p)->uid != current->uid && !suser()) {
			error = EPERM;
			continue;
		}
		if (error == ESRCH)
			error = 0;
		if (priority > (*p)->priority && !suser())
			error = EACCES;
		else
			(*p)->priority = priority;
	}
	return -error;
}

asmlinkage int sys_getpriority(int which, int who)
{
	struct task_struct **p;
	int max_prio = 0;

	if (which > 2 || which < 0)
		return -EINVAL;

	for(p = &LAST_TASK; p > &FIRST_TASK; --p) {
		if (!*p || !proc_sel(*p, which, who))
			continue;
		if ((*p)->priority > max_prio)
			max_prio = (*p)->priority;
	}
	return(max_prio ? max_prio : -ESRCH);
}

asmlinkage int sys_profil(void)
{
	return -ENOSYS;
}

asmlinkage int sys_ftime(void)
{
	return -ENOSYS;
}

asmlinkage int sys_break(void)
{
	return -ENOSYS;
}

asmlinkage int sys_stty(void)
{
	return -ENOSYS;
}

asmlinkage int sys_gtty(void)
{
	return -ENOSYS;
}

asmlinkage int sys_prof(void)
{
	return -ENOSYS;
}

extern void hard_reset_now(void);

/*
 * Reboot system call: for obvious reasons only root may call it,
 * and even root needs to set up some magic numbers in the registers
 * so that some mistake won't make this reboot the whole machine.
 * You can also set the meaning of the ctrl-alt-del-key here.
 *
 * reboot doesn't sync: do that yourself before calling this.
 */
asmlinkage int sys_reboot(int magic, int magic_too, int flag)
{
	if (!suser())
		return -EPERM;
	if (magic != 0xfee1dead || magic_too != 672274793)
		return -EINVAL;
	if (flag == 0x01234567)
		hard_reset_now();
	else if (flag == 0x89ABCDEF)
		C_A_D = 1;
	else if (!flag)
		C_A_D = 0;
	else
		return -EINVAL;
	return (0);
}

/*
 * This function gets called by ctrl-alt-del - ie the keyboard interrupt.
 * As it's called within an interrupt, it may NOT sync: the only choice
 * is whether to reboot at once, or just ignore the ctrl-alt-del.
 */
void ctrl_alt_del(void)
{
	if (C_A_D)
		hard_reset_now();
	else
		send_sig(SIGINT,task[1],1);
}
	

/*
 * Unprivileged users may change the real gid to the effective gid
 * or vice versa.  (BSD-style)
 *
 * If you set the real gid at all, or set the effective gid to a value not
 * equal to the real gid, then the saved gid is set to the new effective gid.
 *
 * This makes it possible for a setgid program to completely drop its
 * privileges, which is often a useful assertion to make when you are doing
 * a security audit over a program.
 *
 * The general idea is that a program which uses just setregid() will be
 * 100% compatible with BSD.  A program which uses just setgid() will be
 * 100% compatible with POSIX w/ Saved ID's. 
 */
asmlinkage int sys_setregid(gid_t rgid, gid_t egid)
{
	int old_rgid = current->gid;

	if (rgid != (gid_t) -1) {
		if ((old_rgid == rgid) ||
		    (current->egid==rgid) ||
		    suser())
			current->gid = rgid;
		else
			return(-EPERM);
	}
	if (egid != (gid_t) -1) {
		if ((old_rgid == egid) ||
		    (current->egid == egid) ||
		    (current->sgid == egid) ||
		    suser())
			current->egid = egid;
		else {
			current->gid = old_rgid;
			return(-EPERM);
		}
	}
	if (rgid != (gid_t) -1 ||
	    (egid != (gid_t) -1 && egid != old_rgid))
		current->sgid = current->egid;
	current->fsgid = current->egid;
	return 0;
}

/*
 * setgid() is implemented like SysV w/ SAVED_IDS 
 */
asmlinkage int sys_setgid(gid_t gid)
{
	if (suser())
		current->gid = current->egid = current->sgid = current->fsgid = gid;
	else if ((gid == current->gid) || (gid == current->sgid))
		current->egid = current->fsgid = gid;
	else
		return -EPERM;
	return 0;
}

asmlinkage int sys_acct(void)
{
	return -ENOSYS;
}

asmlinkage int sys_phys(void)
{
	return -ENOSYS;
}

asmlinkage int sys_lock(void)
{
	return -ENOSYS;
}

asmlinkage int sys_mpx(void)
{
	return -ENOSYS;
}

asmlinkage int sys_ulimit(void)
{
	return -ENOSYS;
}

asmlinkage int sys_old_syscall(void)
{
	return -ENOSYS;
}

/*
 * Unprivileged users may change the real uid to the effective uid
 * or vice versa.  (BSD-style)
 *
 * If you set the real uid at all, or set the effective uid to a value not
 * equal to the real uid, then the saved uid is set to the new effective uid.
 *
 * This makes it possible for a setuid program to completely drop its
 * privileges, which is often a useful assertion to make when you are doing
 * a security audit over a program.
 *
 * The general idea is that a program which uses just setreuid() will be
 * 100% compatible with BSD.  A program which uses just setuid() will be
 * 100% compatible with POSIX w/ Saved ID's. 
 */
asmlinkage int sys_setreuid(uid_t ruid, uid_t euid)
{
	int old_ruid = current->uid;

	if (ruid != (uid_t) -1) {
		if ((old_ruid == ruid) || 
		    (current->euid==ruid) ||
		    suser())
			current->uid = ruid;
		else
			return(-EPERM);
	}
	if (euid != (uid_t) -1) {
		if ((old_ruid == euid) ||
		    (current->euid == euid) ||
		    (current->suid == euid) ||
		    suser())
			current->euid = euid;
		else {
			current->uid = old_ruid;
			return(-EPERM);
		}
	}
	if (ruid != (uid_t) -1 ||
	    (euid != (uid_t) -1 && euid != old_ruid))
		current->suid = current->euid;
	current->fsuid = current->euid;
	return 0;
}

/*
 * setuid() is implemented like SysV w/ SAVED_IDS 
 * 
 * Note that SAVED_ID's is deficient in that a setuid root program
 * like sendmail, for example, cannot set its uid to be a normal 
 * user and then switch back, because if you're root, setuid() sets
 * the saved uid too.  If you don't like this, blame the bright people
 * in the POSIX committee and/or USG.  Note that the BSD-style setreuid()
 * will allow a root program to temporarily drop privileges and be able to
 * regain them by swapping the real and effective uid.  
 */
asmlinkage int sys_setuid(uid_t uid)
{
	if (suser())
		current->uid = current->euid = current->suid = current->fsuid = uid;
	else if ((uid == current->uid) || (uid == current->suid))
		current->fsuid = current->euid = uid;
	else
		return -EPERM;
	return(0);
}

/*
 * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This
 * is used for "access()" and for the NFS daemon (letting nfsd stay at
 * whatever uid it wants to). It normally shadows "euid", except when
 * explicitly set by setfsuid() or for access..
 */
asmlinkage int sys_setfsuid(uid_t uid)
{
	int old_fsuid = current->fsuid;

	if (uid == current->uid || uid == current->euid ||
	    uid == current->suid || uid == current->fsuid || suser())
		current->fsuid = uid;
	return old_fsuid;
}

/*
 * Samma på svenska..
 */
asmlinkage int sys_setfsgid(gid_t gid)
{
	int old_fsgid = current->fsgid;

	if (gid == current->gid || gid == current->egid ||
	    gid == current->sgid || gid == current->fsgid || suser())
		current->fsgid = gid;
	return old_fsgid;
}

asmlinkage int sys_times(struct tms * tbuf)
{
	if (tbuf) {
		int error = verify_area(VERIFY_WRITE,tbuf,sizeof *tbuf);
		if (error)
			return error;
		put_fs_long(current->utime,(unsigned long *)&tbuf->tms_utime);
		put_fs_long(current->stime,(unsigned long *)&tbuf->tms_stime);
		put_fs_long(current->cutime,(unsigned long *)&tbuf->tms_cutime);
		put_fs_long(current->cstime,(unsigned long *)&tbuf->tms_cstime);
	}
	return jiffies;
}

asmlinkage int sys_brk(unsigned long brk)
{
	int freepages;
	unsigned long rlim;
	unsigned long newbrk, oldbrk;
	struct vm_area_struct * vma;

	if (brk < current->mm->end_code)
		return current->mm->brk;
	newbrk = PAGE_ALIGN(brk);
	oldbrk = PAGE_ALIGN(current->mm->brk);
	if (oldbrk == newbrk)
		return current->mm->brk = brk;

	/*
	 * Always allow shrinking brk
	 */
	if (brk <= current->mm->brk) {
		current->mm->brk = brk;
		do_munmap(newbrk, oldbrk-newbrk);
		return brk;
	}
	/*
	 * Check against rlimit and stack..
	 */
	rlim = current->rlim[RLIMIT_DATA].rlim_cur;
	if (rlim >= RLIM_INFINITY)
		rlim = ~0;
	if (brk - current->mm->end_code > rlim ||
	    brk >= current->mm->start_stack - 16384)
		return current->mm->brk;
	/*
	 * Check against existing mmap mappings.
	 */
	for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
		if (newbrk <= vma->vm_start)
			break;
		if (oldbrk < vma->vm_end)
			return current->mm->brk;
	}
	/*
	 * stupid algorithm to decide if we have enough memory: while
	 * simple, it hopefully works in most obvious cases.. Easy to
	 * fool it, but this should catch most mistakes.
	 */
	freepages = buffermem >> 12;
	freepages += nr_free_pages;
	freepages += nr_swap_pages;
	freepages -= (high_memory - 0x100000) >> 16;
	freepages -= (newbrk-oldbrk) >> 12;
	if (freepages < 0)
		return current->mm->brk;
#if 0
	freepages += current->mm->rss;
	freepages -= oldbrk >> 12;
	if (freepages < 0)
		return current->mm->brk;
#endif
	/*
	 * Ok, we have probably got enough memory - let it rip.
	 */
	current->mm->brk = brk;
	do_mmap(NULL, oldbrk, newbrk-oldbrk,
		PROT_READ|PROT_WRITE|PROT_EXEC,
		MAP_FIXED|MAP_PRIVATE, 0);
	return brk;
}

/*
 * This needs some heave checking ...
 * I just haven't get the stomach for it. I also don't fully
 * understand sessions/pgrp etc. Let somebody who does explain it.
 *
 * OK, I think I have the protection semantics right.... this is really
 * only important on a multi-user system anyway, to make sure one user
 * can't send a signal to a process owned by another.  -TYT, 12/12/91
 *
 * Auch. Had to add the 'did_exec' flag to conform completely to POSIX.
 * LBT 04.03.94
 */
asmlinkage int sys_setpgid(pid_t pid, pid_t pgid)
{
	struct task_struct * p;

	if (!pid)
		pid = current->pid;
	if (!pgid)
		pgid = pid;
	if (pgid < 0)
		return -EINVAL;
	for_each_task(p) {
		if (p->pid == pid)
			goto found_task;
	}
	return -ESRCH;

found_task:
	if (p->p_pptr == current || p->p_opptr == current) {
		if (p->session != current->session)
			return -EPERM;
		if (p->did_exec)
			return -EACCES;
	} else if (p != current)
		return -ESRCH;
	if (p->leader)
		return -EPERM;
	if (pgid != pid) {
		struct task_struct * tmp;
		for_each_task (tmp) {
			if (tmp->pgrp == pgid &&
			 tmp->session == current->session)
				goto ok_pgid;
		}
		return -EPERM;
	}

ok_pgid:
	p->pgrp = pgid;
	return 0;
}

asmlinkage int sys_getpgid(pid_t pid)
{
	struct task_struct * p;

	if (!pid)
		return current->pgrp;
	for_each_task(p) {
		if (p->pid == pid)
			return p->pgrp;
	}
	return -ESRCH;
}

asmlinkage int sys_getpgrp(void)
{
	return current->pgrp;
}

asmlinkage int sys_setsid(void)
{
	if (current->leader)
		return -EPERM;
	current->leader = 1;
	current->session = current->pgrp = current->pid;
	current->tty = NULL;
	return current->pgrp;
}

/*
 * Supplementary group ID's
 */
asmlinkage int sys_getgroups(int gidsetsize, gid_t *grouplist)
{
	int i;

	if (gidsetsize) {
		i = verify_area(VERIFY_WRITE, grouplist, sizeof(gid_t) * gidsetsize);
		if (i)
			return i;
	}
	for (i = 0 ; (i < NGROUPS) && (current->groups[i] != NOGROUP) ; i++) {
		if (!gidsetsize)
			continue;
		if (i >= gidsetsize)
			break;
		put_fs_word(current->groups[i], (short *) grouplist);
		grouplist++;
	}
	return(i);
}

asmlinkage int sys_setgroups(int gidsetsize, gid_t *grouplist)
{
	int	i;

	if (!suser())
		return -EPERM;
	if (gidsetsize > NGROUPS)
		return -EINVAL;
	for (i = 0; i < gidsetsize; i++, grouplist++) {
		current->groups[i] = get_fs_word((unsigned short *) grouplist);
	}
	if (i < NGROUPS)
		current->groups[i] = NOGROUP;
	return 0;
}

int in_group_p(gid_t grp)
{
	int	i;

	if (grp == current->fsgid)
		return 1;

	for (i = 0; i < NGROUPS; i++) {
		if (current->groups[i] == NOGROUP)
			break;
		if (current->groups[i] == grp)
			return 1;
	}
	return 0;
}

asmlinkage int sys_newuname(struct new_utsname * name)
{
	int error;

	if (!name)
		return -EFAULT;
	error = verify_area(VERIFY_WRITE, name, sizeof *name);
	if (!error)
		memcpy_tofs(name,&system_utsname,sizeof *name);
	return error;
}

asmlinkage int sys_uname(struct old_utsname * name)
{
	int error;
	if (!name)
		return -EFAULT;
	error = verify_area(VERIFY_WRITE, name,sizeof *name);
	if (error)
		return error;
	memcpy_tofs(&name->sysname,&system_utsname.sysname,
		sizeof (system_utsname.sysname));
	memcpy_tofs(&name->nodename,&system_utsname.nodename,
		sizeof (system_utsname.nodename));
	memcpy_tofs(&name->release,&system_utsname.release,
		sizeof (system_utsname.release));
	memcpy_tofs(&name->version,&system_utsname.version,
		sizeof (system_utsname.version));
	memcpy_tofs(&name->machine,&system_utsname.machine,
		sizeof (system_utsname.machine));
	return 0;
}

asmlinkage int sys_olduname(struct oldold_utsname * name)
{
	int error;
	if (!name)
		return -EFAULT;
	error = verify_area(VERIFY_WRITE, name,sizeof *name);
	if (error)
		return error;
	memcpy_tofs(&name->sysname,&system_utsname.sysname,__OLD_UTS_LEN);
	put_fs_byte(0,name->sysname+__OLD_UTS_LEN);
	memcpy_tofs(&name->nodename,&system_utsname.nodename,__OLD_UTS_LEN);
	put_fs_byte(0,name->nodename+__OLD_UTS_LEN);
	memcpy_tofs(&name->release,&system_utsname.release,__OLD_UTS_LEN);
	put_fs_byte(0,name->release+__OLD_UTS_LEN);
	memcpy_tofs(&name->version,&system_utsname.version,__OLD_UTS_LEN);
	put_fs_byte(0,name->version+__OLD_UTS_LEN);
	memcpy_tofs(&name->machine,&system_utsname.machine,__OLD_UTS_LEN);
	put_fs_byte(0,name->machine+__OLD_UTS_LEN);
	return 0;
}

/*
 * Only sethostname; gethostname can be implemented by calling uname()
 */
asmlinkage int sys_sethostname(char *name, int len)
{
	int	i;
	
	if (!suser())
		return -EPERM;
	if (len > __NEW_UTS_LEN)
		return -EINVAL;
	for (i=0; i < len; i++) {
		if ((system_utsname.nodename[i] = get_fs_byte(name+i)) == 0)
			return 0;
	}
	system_utsname.nodename[i] = 0;
	return 0;
}

/*
 * Only setdomainname; getdomainname can be implemented by calling
 * uname()
 */
asmlinkage int sys_setdomainname(char *name, int len)
{
	int	i;
	
	if (!suser())
		return -EPERM;
	if (len > __NEW_UTS_LEN)
		return -EINVAL;
	for (i=0; i < len; i++) {
		if ((system_utsname.domainname[i] = get_fs_byte(name+i)) == 0)
			return 0;
	}
	system_utsname.domainname[i] = 0;
	return 0;
}

asmlinkage int sys_getrlimit(unsigned int resource, struct rlimit *rlim)
{
	int error;

	if (resource >= RLIM_NLIMITS)
		return -EINVAL;
	error = verify_area(VERIFY_WRITE,rlim,sizeof *rlim);
	if (error)
		return error;
	put_fs_long(current->rlim[resource].rlim_cur, 
		    (unsigned long *) rlim);
	put_fs_long(current->rlim[resource].rlim_max, 
		    ((unsigned long *) rlim)+1);
	return 0;	
}

asmlinkage int sys_setrlimit(unsigned int resource, struct rlimit *rlim)
{
	struct rlimit new_rlim, *old_rlim;
	int err;

	if (resource >= RLIM_NLIMITS)
		return -EINVAL;
	err = verify_area(VERIFY_READ, rlim, sizeof(*rlim));
	if (err)
		return err;
	memcpy_fromfs(&new_rlim, rlim, sizeof(*rlim));
	old_rlim = current->rlim + resource;
	if (((new_rlim.rlim_cur > old_rlim->rlim_max) ||
	     (new_rlim.rlim_max > old_rlim->rlim_max)) &&
	    !suser())
		return -EPERM;
	*old_rlim = new_rlim;
	return 0;
}

/*
 * It would make sense to put struct rusage in the task_struct,
 * except that would make the task_struct be *really big*.  After
 * task_struct gets moved into malloc'ed memory, it would
 * make sense to do this.  It will make moving the rest of the information
 * a lot simpler!  (Which we're not doing right now because we're not
 * measuring them yet).
 */
int getrusage(struct task_struct *p, int who, struct rusage *ru)
{
	int error;
	struct rusage r;

	error = verify_area(VERIFY_WRITE, ru, sizeof *ru);
	if (error)
		return error;
	memset((char *) &r, 0, sizeof(r));
	switch (who) {
		case RUSAGE_SELF:
			r.ru_utime.tv_sec = CT_TO_SECS(p->utime);
			r.ru_utime.tv_usec = CT_TO_USECS(p->utime);
			r.ru_stime.tv_sec = CT_TO_SECS(p->stime);
			r.ru_stime.tv_usec = CT_TO_USECS(p->stime);
			r.ru_minflt = p->mm->min_flt;
			r.ru_majflt = p->mm->maj_flt;
			break;
		case RUSAGE_CHILDREN:
			r.ru_utime.tv_sec = CT_TO_SECS(p->cutime);
			r.ru_utime.tv_usec = CT_TO_USECS(p->cutime);
			r.ru_stime.tv_sec = CT_TO_SECS(p->cstime);
			r.ru_stime.tv_usec = CT_TO_USECS(p->cstime);
			r.ru_minflt = p->mm->cmin_flt;
			r.ru_majflt = p->mm->cmaj_flt;
			break;
		default:
			r.ru_utime.tv_sec = CT_TO_SECS(p->utime + p->cutime);
			r.ru_utime.tv_usec = CT_TO_USECS(p->utime + p->cutime);
			r.ru_stime.tv_sec = CT_TO_SECS(p->stime + p->cstime);
			r.ru_stime.tv_usec = CT_TO_USECS(p->stime + p->cstime);
			r.ru_minflt = p->mm->min_flt + p->mm->cmin_flt;
			r.ru_majflt = p->mm->maj_flt + p->mm->cmaj_flt;
			break;
	}
	memcpy_tofs(ru, &r, sizeof(r));
	return 0;
}

asmlinkage int sys_getrusage(int who, struct rusage *ru)
{
	if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN)
		return -EINVAL;
	return getrusage(current, who, ru);
}

asmlinkage int sys_umask(int mask)
{
	int old = current->fs->umask;

	current->fs->umask = mask & S_IRWXUGO;
	return (old);
}