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