1
2
3
4
5
6
7
8
9
10
11
12
13#include <linux/compat.h>
14#include <linux/sched.h>
15#include <linux/mm.h>
16#include <linux/smp.h>
17#include <linux/kernel.h>
18#include <linux/signal.h>
19#include <linux/errno.h>
20#include <linux/wait.h>
21#include <linux/ptrace.h>
22#include <linux/unistd.h>
23#include <linux/stddef.h>
24#include <linux/tty.h>
25#include <linux/personality.h>
26#include <linux/binfmts.h>
27#include <asm/ucontext.h>
28#include <asm/uaccess.h>
29#include <asm/lowcore.h>
30#include "compat_linux.h"
31#include "compat_ptrace.h"
32#include "entry.h"
33
34#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
35
36typedef struct
37{
38 __u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
39 struct sigcontext32 sc;
40 _sigregs32 sregs;
41 int signo;
42 __u32 gprs_high[NUM_GPRS];
43 __u8 retcode[S390_SYSCALL_SIZE];
44} sigframe32;
45
46typedef struct
47{
48 __u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
49 __u8 retcode[S390_SYSCALL_SIZE];
50 compat_siginfo_t info;
51 struct ucontext32 uc;
52 __u32 gprs_high[NUM_GPRS];
53} rt_sigframe32;
54
55int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
56{
57 int err;
58
59 if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
60 return -EFAULT;
61
62
63
64
65
66
67
68
69 err = __put_user(from->si_signo, &to->si_signo);
70 err |= __put_user(from->si_errno, &to->si_errno);
71 err |= __put_user((short)from->si_code, &to->si_code);
72 if (from->si_code < 0)
73 err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
74 else {
75 switch (from->si_code >> 16) {
76 case __SI_RT >> 16:
77 case __SI_MESGQ >> 16:
78 err |= __put_user(from->si_int, &to->si_int);
79
80 case __SI_KILL >> 16:
81 err |= __put_user(from->si_pid, &to->si_pid);
82 err |= __put_user(from->si_uid, &to->si_uid);
83 break;
84 case __SI_CHLD >> 16:
85 err |= __put_user(from->si_pid, &to->si_pid);
86 err |= __put_user(from->si_uid, &to->si_uid);
87 err |= __put_user(from->si_utime, &to->si_utime);
88 err |= __put_user(from->si_stime, &to->si_stime);
89 err |= __put_user(from->si_status, &to->si_status);
90 break;
91 case __SI_FAULT >> 16:
92 err |= __put_user((unsigned long) from->si_addr,
93 &to->si_addr);
94 break;
95 case __SI_POLL >> 16:
96 err |= __put_user(from->si_band, &to->si_band);
97 err |= __put_user(from->si_fd, &to->si_fd);
98 break;
99 case __SI_TIMER >> 16:
100 err |= __put_user(from->si_tid, &to->si_tid);
101 err |= __put_user(from->si_overrun, &to->si_overrun);
102 err |= __put_user(from->si_int, &to->si_int);
103 break;
104 default:
105 break;
106 }
107 }
108 return err;
109}
110
111int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
112{
113 int err;
114 u32 tmp;
115
116 if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t)))
117 return -EFAULT;
118
119 err = __get_user(to->si_signo, &from->si_signo);
120 err |= __get_user(to->si_errno, &from->si_errno);
121 err |= __get_user(to->si_code, &from->si_code);
122
123 if (to->si_code < 0)
124 err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
125 else {
126 switch (to->si_code >> 16) {
127 case __SI_RT >> 16:
128 case __SI_MESGQ >> 16:
129 err |= __get_user(to->si_int, &from->si_int);
130
131 case __SI_KILL >> 16:
132 err |= __get_user(to->si_pid, &from->si_pid);
133 err |= __get_user(to->si_uid, &from->si_uid);
134 break;
135 case __SI_CHLD >> 16:
136 err |= __get_user(to->si_pid, &from->si_pid);
137 err |= __get_user(to->si_uid, &from->si_uid);
138 err |= __get_user(to->si_utime, &from->si_utime);
139 err |= __get_user(to->si_stime, &from->si_stime);
140 err |= __get_user(to->si_status, &from->si_status);
141 break;
142 case __SI_FAULT >> 16:
143 err |= __get_user(tmp, &from->si_addr);
144 to->si_addr = (void __user *)(u64) (tmp & PSW32_ADDR_INSN);
145 break;
146 case __SI_POLL >> 16:
147 err |= __get_user(to->si_band, &from->si_band);
148 err |= __get_user(to->si_fd, &from->si_fd);
149 break;
150 case __SI_TIMER >> 16:
151 err |= __get_user(to->si_tid, &from->si_tid);
152 err |= __get_user(to->si_overrun, &from->si_overrun);
153 err |= __get_user(to->si_int, &from->si_int);
154 break;
155 default:
156 break;
157 }
158 }
159 return err;
160}
161
162asmlinkage long
163sys32_sigaction(int sig, const struct old_sigaction32 __user *act,
164 struct old_sigaction32 __user *oact)
165{
166 struct k_sigaction new_ka, old_ka;
167 unsigned long sa_handler, sa_restorer;
168 int ret;
169
170 if (act) {
171 compat_old_sigset_t mask;
172 if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
173 __get_user(sa_handler, &act->sa_handler) ||
174 __get_user(sa_restorer, &act->sa_restorer) ||
175 __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
176 __get_user(mask, &act->sa_mask))
177 return -EFAULT;
178 new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
179 new_ka.sa.sa_restorer = (void (*)(void)) sa_restorer;
180 siginitset(&new_ka.sa.sa_mask, mask);
181 }
182
183 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
184
185 if (!ret && oact) {
186 sa_handler = (unsigned long) old_ka.sa.sa_handler;
187 sa_restorer = (unsigned long) old_ka.sa.sa_restorer;
188 if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
189 __put_user(sa_handler, &oact->sa_handler) ||
190 __put_user(sa_restorer, &oact->sa_restorer) ||
191 __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
192 __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
193 return -EFAULT;
194 }
195
196 return ret;
197}
198
199asmlinkage long
200sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
201 struct sigaction32 __user *oact, size_t sigsetsize)
202{
203 struct k_sigaction new_ka, old_ka;
204 unsigned long sa_handler;
205 int ret;
206 compat_sigset_t set32;
207
208
209 if (sigsetsize != sizeof(compat_sigset_t))
210 return -EINVAL;
211
212 if (act) {
213 ret = get_user(sa_handler, &act->sa_handler);
214 ret |= __copy_from_user(&set32, &act->sa_mask,
215 sizeof(compat_sigset_t));
216 switch (_NSIG_WORDS) {
217 case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6]
218 | (((long)set32.sig[7]) << 32);
219 case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4]
220 | (((long)set32.sig[5]) << 32);
221 case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2]
222 | (((long)set32.sig[3]) << 32);
223 case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0]
224 | (((long)set32.sig[1]) << 32);
225 }
226 ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
227
228 if (ret)
229 return -EFAULT;
230 new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
231 }
232
233 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
234
235 if (!ret && oact) {
236 switch (_NSIG_WORDS) {
237 case 4:
238 set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32);
239 set32.sig[6] = old_ka.sa.sa_mask.sig[3];
240 case 3:
241 set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32);
242 set32.sig[4] = old_ka.sa.sa_mask.sig[2];
243 case 2:
244 set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32);
245 set32.sig[2] = old_ka.sa.sa_mask.sig[1];
246 case 1:
247 set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
248 set32.sig[0] = old_ka.sa.sa_mask.sig[0];
249 }
250 ret = put_user((unsigned long)old_ka.sa.sa_handler, &oact->sa_handler);
251 ret |= __copy_to_user(&oact->sa_mask, &set32,
252 sizeof(compat_sigset_t));
253 ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
254 }
255
256 return ret;
257}
258
259asmlinkage long
260sys32_sigaltstack(const stack_t32 __user *uss, stack_t32 __user *uoss)
261{
262 struct pt_regs *regs = task_pt_regs(current);
263 stack_t kss, koss;
264 unsigned long ss_sp;
265 int ret, err = 0;
266 mm_segment_t old_fs = get_fs();
267
268 if (uss) {
269 if (!access_ok(VERIFY_READ, uss, sizeof(*uss)))
270 return -EFAULT;
271 err |= __get_user(ss_sp, &uss->ss_sp);
272 err |= __get_user(kss.ss_size, &uss->ss_size);
273 err |= __get_user(kss.ss_flags, &uss->ss_flags);
274 if (err)
275 return -EFAULT;
276 kss.ss_sp = (void __user *) ss_sp;
277 }
278
279 set_fs (KERNEL_DS);
280 ret = do_sigaltstack((stack_t __force __user *) (uss ? &kss : NULL),
281 (stack_t __force __user *) (uoss ? &koss : NULL),
282 regs->gprs[15]);
283 set_fs (old_fs);
284
285 if (!ret && uoss) {
286 if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss)))
287 return -EFAULT;
288 ss_sp = (unsigned long) koss.ss_sp;
289 err |= __put_user(ss_sp, &uoss->ss_sp);
290 err |= __put_user(koss.ss_size, &uoss->ss_size);
291 err |= __put_user(koss.ss_flags, &uoss->ss_flags);
292 if (err)
293 return -EFAULT;
294 }
295 return ret;
296}
297
298static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs)
299{
300 _s390_regs_common32 regs32;
301 int err, i;
302
303 regs32.psw.mask = PSW32_MASK_MERGE(psw32_user_bits,
304 (__u32)(regs->psw.mask >> 32));
305 regs32.psw.addr = PSW32_ADDR_AMODE31 | (__u32) regs->psw.addr;
306 for (i = 0; i < NUM_GPRS; i++)
307 regs32.gprs[i] = (__u32) regs->gprs[i];
308 save_access_regs(current->thread.acrs);
309 memcpy(regs32.acrs, current->thread.acrs, sizeof(regs32.acrs));
310 err = __copy_to_user(&sregs->regs, ®s32, sizeof(regs32));
311 if (err)
312 return err;
313 save_fp_regs(¤t->thread.fp_regs);
314
315 return __copy_to_user(&sregs->fpregs, ¤t->thread.fp_regs,
316 sizeof(_s390_fp_regs32));
317}
318
319static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
320{
321 _s390_regs_common32 regs32;
322 int err, i;
323
324
325 current_thread_info()->restart_block.fn = do_no_restart_syscall;
326
327 err = __copy_from_user(®s32, &sregs->regs, sizeof(regs32));
328 if (err)
329 return err;
330 regs->psw.mask = PSW_MASK_MERGE(regs->psw.mask,
331 (__u64)regs32.psw.mask << 32);
332 regs->psw.addr = (__u64)(regs32.psw.addr & PSW32_ADDR_INSN);
333 for (i = 0; i < NUM_GPRS; i++)
334 regs->gprs[i] = (__u64) regs32.gprs[i];
335 memcpy(current->thread.acrs, regs32.acrs, sizeof(current->thread.acrs));
336 restore_access_regs(current->thread.acrs);
337
338 err = __copy_from_user(¤t->thread.fp_regs, &sregs->fpregs,
339 sizeof(_s390_fp_regs32));
340 current->thread.fp_regs.fpc &= FPC_VALID_MASK;
341 if (err)
342 return err;
343
344 restore_fp_regs(¤t->thread.fp_regs);
345 regs->svcnr = 0;
346 return 0;
347}
348
349static int save_sigregs_gprs_high(struct pt_regs *regs, __u32 __user *uregs)
350{
351 __u32 gprs_high[NUM_GPRS];
352 int i;
353
354 for (i = 0; i < NUM_GPRS; i++)
355 gprs_high[i] = regs->gprs[i] >> 32;
356
357 return __copy_to_user(uregs, &gprs_high, sizeof(gprs_high));
358}
359
360static int restore_sigregs_gprs_high(struct pt_regs *regs, __u32 __user *uregs)
361{
362 __u32 gprs_high[NUM_GPRS];
363 int err, i;
364
365 err = __copy_from_user(&gprs_high, uregs, sizeof(gprs_high));
366 if (err)
367 return err;
368 for (i = 0; i < NUM_GPRS; i++)
369 *(__u32 *)®s->gprs[i] = gprs_high[i];
370 return 0;
371}
372
373asmlinkage long sys32_sigreturn(void)
374{
375 struct pt_regs *regs = task_pt_regs(current);
376 sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15];
377 sigset_t set;
378
379 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
380 goto badframe;
381 if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE32))
382 goto badframe;
383
384 sigdelsetmask(&set, ~_BLOCKABLE);
385 spin_lock_irq(¤t->sighand->siglock);
386 current->blocked = set;
387 recalc_sigpending();
388 spin_unlock_irq(¤t->sighand->siglock);
389
390 if (restore_sigregs32(regs, &frame->sregs))
391 goto badframe;
392 if (restore_sigregs_gprs_high(regs, frame->gprs_high))
393 goto badframe;
394
395 return regs->gprs[2];
396
397badframe:
398 force_sig(SIGSEGV, current);
399 return 0;
400}
401
402asmlinkage long sys32_rt_sigreturn(void)
403{
404 struct pt_regs *regs = task_pt_regs(current);
405 rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15];
406 sigset_t set;
407 stack_t st;
408 __u32 ss_sp;
409 int err;
410 mm_segment_t old_fs = get_fs();
411
412 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
413 goto badframe;
414 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
415 goto badframe;
416
417 sigdelsetmask(&set, ~_BLOCKABLE);
418 spin_lock_irq(¤t->sighand->siglock);
419 current->blocked = set;
420 recalc_sigpending();
421 spin_unlock_irq(¤t->sighand->siglock);
422
423 if (restore_sigregs32(regs, &frame->uc.uc_mcontext))
424 goto badframe;
425 if (restore_sigregs_gprs_high(regs, frame->gprs_high))
426 goto badframe;
427
428 err = __get_user(ss_sp, &frame->uc.uc_stack.ss_sp);
429 st.ss_sp = compat_ptr(ss_sp);
430 err |= __get_user(st.ss_size, &frame->uc.uc_stack.ss_size);
431 err |= __get_user(st.ss_flags, &frame->uc.uc_stack.ss_flags);
432 if (err)
433 goto badframe;
434
435 set_fs (KERNEL_DS);
436 do_sigaltstack((stack_t __force __user *)&st, NULL, regs->gprs[15]);
437 set_fs (old_fs);
438
439 return regs->gprs[2];
440
441badframe:
442 force_sig(SIGSEGV, current);
443 return 0;
444}
445
446
447
448
449
450
451
452
453
454static inline void __user *
455get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
456{
457 unsigned long sp;
458
459
460 sp = (unsigned long) A(regs->gprs[15]);
461
462
463 if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL))
464 return (void __user *) -1UL;
465
466
467 if (ka->sa.sa_flags & SA_ONSTACK) {
468 if (! sas_ss_flags(sp))
469 sp = current->sas_ss_sp + current->sas_ss_size;
470 }
471
472
473 else if (!user_mode(regs) &&
474 !(ka->sa.sa_flags & SA_RESTORER) &&
475 ka->sa.sa_restorer) {
476 sp = (unsigned long) ka->sa.sa_restorer;
477 }
478
479 return (void __user *)((sp - frame_size) & -8ul);
480}
481
482static inline int map_signal(int sig)
483{
484 if (current_thread_info()->exec_domain
485 && current_thread_info()->exec_domain->signal_invmap
486 && sig < 32)
487 return current_thread_info()->exec_domain->signal_invmap[sig];
488 else
489 return sig;
490}
491
492static int setup_frame32(int sig, struct k_sigaction *ka,
493 sigset_t *set, struct pt_regs * regs)
494{
495 sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(sigframe32));
496 if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe32)))
497 goto give_sigsegv;
498
499 if (frame == (void __user *) -1UL)
500 goto give_sigsegv;
501
502 if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE32))
503 goto give_sigsegv;
504
505 if (save_sigregs32(regs, &frame->sregs))
506 goto give_sigsegv;
507 if (save_sigregs_gprs_high(regs, frame->gprs_high))
508 goto give_sigsegv;
509 if (__put_user((unsigned long) &frame->sregs, &frame->sc.sregs))
510 goto give_sigsegv;
511
512
513
514 if (ka->sa.sa_flags & SA_RESTORER) {
515 regs->gprs[14] = (__u64) ka->sa.sa_restorer;
516 } else {
517 regs->gprs[14] = (__u64) frame->retcode;
518 if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn,
519 (u16 __user *)(frame->retcode)))
520 goto give_sigsegv;
521 }
522
523
524 if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
525 goto give_sigsegv;
526
527
528 regs->gprs[15] = (__u64) frame;
529 regs->psw.addr = (__u64) ka->sa.sa_handler;
530
531 regs->gprs[2] = map_signal(sig);
532 regs->gprs[3] = (__u64) &frame->sc;
533
534
535
536 regs->gprs[4] = current->thread.trap_no;
537 regs->gprs[5] = current->thread.prot_addr;
538
539
540 if (__put_user(regs->gprs[2], (int __user *) &frame->signo))
541 goto give_sigsegv;
542 return 0;
543
544give_sigsegv:
545 force_sigsegv(sig, current);
546 return -EFAULT;
547}
548
549static int setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info,
550 sigset_t *set, struct pt_regs * regs)
551{
552 int err = 0;
553 rt_sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(rt_sigframe32));
554 if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe32)))
555 goto give_sigsegv;
556
557 if (frame == (void __user *) -1UL)
558 goto give_sigsegv;
559
560 if (copy_siginfo_to_user32(&frame->info, info))
561 goto give_sigsegv;
562
563
564 err |= __put_user(UC_EXTENDED, &frame->uc.uc_flags);
565 err |= __put_user(0, &frame->uc.uc_link);
566 err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
567 err |= __put_user(sas_ss_flags(regs->gprs[15]),
568 &frame->uc.uc_stack.ss_flags);
569 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
570 err |= save_sigregs32(regs, &frame->uc.uc_mcontext);
571 err |= save_sigregs_gprs_high(regs, frame->gprs_high);
572 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
573 if (err)
574 goto give_sigsegv;
575
576
577
578 if (ka->sa.sa_flags & SA_RESTORER) {
579 regs->gprs[14] = (__u64) ka->sa.sa_restorer;
580 } else {
581 regs->gprs[14] = (__u64) frame->retcode;
582 err |= __put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn,
583 (u16 __user *)(frame->retcode));
584 }
585
586
587 if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
588 goto give_sigsegv;
589
590
591 regs->gprs[15] = (__u64) frame;
592 regs->psw.addr = (__u64) ka->sa.sa_handler;
593
594 regs->gprs[2] = map_signal(sig);
595 regs->gprs[3] = (__u64) &frame->info;
596 regs->gprs[4] = (__u64) &frame->uc;
597 return 0;
598
599give_sigsegv:
600 force_sigsegv(sig, current);
601 return -EFAULT;
602}
603
604
605
606
607
608int
609handle_signal32(unsigned long sig, struct k_sigaction *ka,
610 siginfo_t *info, sigset_t *oldset, struct pt_regs * regs)
611{
612 int ret;
613
614
615 if (ka->sa.sa_flags & SA_SIGINFO)
616 ret = setup_rt_frame32(sig, ka, info, oldset, regs);
617 else
618 ret = setup_frame32(sig, ka, oldset, regs);
619
620 if (ret == 0) {
621 spin_lock_irq(¤t->sighand->siglock);
622 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
623 if (!(ka->sa.sa_flags & SA_NODEFER))
624 sigaddset(¤t->blocked,sig);
625 recalc_sigpending();
626 spin_unlock_irq(¤t->sighand->siglock);
627 }
628 return ret;
629}
630
631
