2 * arch/s390/kernel/compat_signal.c
4 * Copyright (C) IBM Corp. 2000,2006
5 * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
6 * Gerhard Tonn (ton@de.ibm.com)
8 * Copyright (C) 1991, 1992 Linus Torvalds
10 * 1997-11-28 Modified for POSIX.1b signals by Richard Henderson
13 #include <linux/compat.h>
14 #include <linux/sched.h>
16 #include <linux/smp.h>
17 #include <linux/smp_lock.h>
18 #include <linux/kernel.h>
19 #include <linux/signal.h>
20 #include <linux/errno.h>
21 #include <linux/wait.h>
22 #include <linux/ptrace.h>
23 #include <linux/unistd.h>
24 #include <linux/stddef.h>
25 #include <linux/tty.h>
26 #include <linux/personality.h>
27 #include <linux/binfmts.h>
28 #include <asm/ucontext.h>
29 #include <asm/uaccess.h>
30 #include <asm/lowcore.h>
31 #include "compat_linux.h"
32 #include "compat_ptrace.h"
34 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
38 __u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
39 struct sigcontext32 sc;
42 __u8 retcode[S390_SYSCALL_SIZE];
47 __u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
48 __u8 retcode[S390_SYSCALL_SIZE];
49 compat_siginfo_t info;
53 int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
57 if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
60 /* If you change siginfo_t structure, please be sure
61 this code is fixed accordingly.
62 It should never copy any pad contained in the structure
63 to avoid security leaks, but must copy the generic
64 3 ints plus the relevant union member.
65 This routine must convert siginfo from 64bit to 32bit as well
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);
73 switch (from->si_code >> 16) {
74 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
75 case __SI_MESGQ >> 16:
76 err |= __put_user(from->si_int, &to->si_int);
79 err |= __put_user(from->si_pid, &to->si_pid);
80 err |= __put_user(from->si_uid, &to->si_uid);
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);
89 case __SI_FAULT >> 16:
90 err |= __put_user((unsigned long) from->si_addr,
94 err |= __put_user(from->si_band, &to->si_band);
95 err |= __put_user(from->si_fd, &to->si_fd);
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);
109 int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
114 if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t)))
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);
122 err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
124 switch (to->si_code >> 16) {
125 case __SI_RT >> 16: /* This is not generated by the kernel as of now. */
126 case __SI_MESGQ >> 16:
127 err |= __get_user(to->si_int, &from->si_int);
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);
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);
140 case __SI_FAULT >> 16:
141 err |= __get_user(tmp, &from->si_addr);
142 to->si_addr = (void __user *)(u64) (tmp & PSW32_ADDR_INSN);
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);
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);
161 sys32_sigaction(int sig, const struct old_sigaction32 __user *act,
162 struct old_sigaction32 __user *oact)
164 struct k_sigaction new_ka, old_ka;
165 unsigned long sa_handler, sa_restorer;
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))
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);
181 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
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))
198 sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
199 struct sigaction32 __user *oact, size_t sigsetsize)
201 struct k_sigaction new_ka, old_ka;
202 unsigned long sa_handler;
204 compat_sigset_t set32;
206 /* XXX: Don't preclude handling different sized sigset_t's. */
207 if (sigsetsize != sizeof(compat_sigset_t))
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);
224 ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
228 new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
231 ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
234 switch (_NSIG_WORDS) {
236 set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32);
237 set32.sig[6] = old_ka.sa.sa_mask.sig[3];
239 set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32);
240 set32.sig[4] = old_ka.sa.sa_mask.sig[2];
242 set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32);
243 set32.sig[2] = old_ka.sa.sa_mask.sig[1];
245 set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
246 set32.sig[0] = old_ka.sa.sa_mask.sig[0];
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);
258 sys32_sigaltstack(const stack_t32 __user *uss, stack_t32 __user *uoss,
259 struct pt_regs *regs)
264 mm_segment_t old_fs = get_fs();
267 if (!access_ok(VERIFY_READ, uss, sizeof(*uss)))
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);
274 kss.ss_sp = (void __user *) ss_sp;
278 ret = do_sigaltstack((stack_t __force __user *) (uss ? &kss : NULL),
279 (stack_t __force __user *) (uoss ? &koss : NULL),
284 if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss)))
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);
296 static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs)
298 _s390_regs_common32 regs32;
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));
311 save_fp_regs(¤t->thread.fp_regs);
312 /* s390_fp_regs and _s390_fp_regs32 are the same ! */
313 return __copy_to_user(&sregs->fpregs, ¤t->thread.fp_regs,
314 sizeof(_s390_fp_regs32));
317 static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
319 _s390_regs_common32 regs32;
322 /* Alwys make any pending restarted system call return -EINTR */
323 current_thread_info()->restart_block.fn = do_no_restart_syscall;
325 err = __copy_from_user(®s32, &sregs->regs, sizeof(regs32));
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);
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;
342 restore_fp_regs(¤t->thread.fp_regs);
343 regs->trap = -1; /* disable syscall checks */
347 asmlinkage long sys32_sigreturn(struct pt_regs *regs)
349 sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15];
352 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
354 if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE32))
357 sigdelsetmask(&set, ~_BLOCKABLE);
358 spin_lock_irq(¤t->sighand->siglock);
359 current->blocked = set;
361 spin_unlock_irq(¤t->sighand->siglock);
363 if (restore_sigregs32(regs, &frame->sregs))
366 return regs->gprs[2];
369 force_sig(SIGSEGV, current);
373 asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs)
375 rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15];
380 mm_segment_t old_fs = get_fs();
382 if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
384 if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
387 sigdelsetmask(&set, ~_BLOCKABLE);
388 spin_lock_irq(¤t->sighand->siglock);
389 current->blocked = set;
391 spin_unlock_irq(¤t->sighand->siglock);
393 if (restore_sigregs32(regs, &frame->uc.uc_mcontext))
396 err = __get_user(ss_sp, &frame->uc.uc_stack.ss_sp);
397 st.ss_sp = compat_ptr(ss_sp);
398 err |= __get_user(st.ss_size, &frame->uc.uc_stack.ss_size);
399 err |= __get_user(st.ss_flags, &frame->uc.uc_stack.ss_flags);
404 do_sigaltstack((stack_t __force __user *)&st, NULL, regs->gprs[15]);
407 return regs->gprs[2];
410 force_sig(SIGSEGV, current);
415 * Set up a signal frame.
420 * Determine which stack to use..
422 static inline void __user *
423 get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
427 /* Default to using normal stack */
428 sp = (unsigned long) A(regs->gprs[15]);
430 /* This is the X/Open sanctioned signal stack switching. */
431 if (ka->sa.sa_flags & SA_ONSTACK) {
432 if (! sas_ss_flags(sp))
433 sp = current->sas_ss_sp + current->sas_ss_size;
436 /* This is the legacy signal stack switching. */
437 else if (!user_mode(regs) &&
438 !(ka->sa.sa_flags & SA_RESTORER) &&
439 ka->sa.sa_restorer) {
440 sp = (unsigned long) ka->sa.sa_restorer;
443 return (void __user *)((sp - frame_size) & -8ul);
446 static inline int map_signal(int sig)
448 if (current_thread_info()->exec_domain
449 && current_thread_info()->exec_domain->signal_invmap
451 return current_thread_info()->exec_domain->signal_invmap[sig];
456 static int setup_frame32(int sig, struct k_sigaction *ka,
457 sigset_t *set, struct pt_regs * regs)
459 sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(sigframe32));
460 if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe32)))
463 if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE32))
466 if (save_sigregs32(regs, &frame->sregs))
468 if (__put_user((unsigned long) &frame->sregs, &frame->sc.sregs))
471 /* Set up to return from userspace. If provided, use a stub
472 already in userspace. */
473 if (ka->sa.sa_flags & SA_RESTORER) {
474 regs->gprs[14] = (__u64) ka->sa.sa_restorer;
476 regs->gprs[14] = (__u64) frame->retcode;
477 if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn,
478 (u16 __user *)(frame->retcode)))
482 /* Set up backchain. */
483 if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
486 /* Set up registers for signal handler */
487 regs->gprs[15] = (__u64) frame;
488 regs->psw.addr = (__u64) ka->sa.sa_handler;
490 regs->gprs[2] = map_signal(sig);
491 regs->gprs[3] = (__u64) &frame->sc;
493 /* We forgot to include these in the sigcontext.
494 To avoid breaking binary compatibility, they are passed as args. */
495 regs->gprs[4] = current->thread.trap_no;
496 regs->gprs[5] = current->thread.prot_addr;
498 /* Place signal number on stack to allow backtrace from handler. */
499 if (__put_user(regs->gprs[2], (int __user *) &frame->signo))
504 force_sigsegv(sig, current);
508 static int setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info,
509 sigset_t *set, struct pt_regs * regs)
512 rt_sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(rt_sigframe32));
513 if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe32)))
516 if (copy_siginfo_to_user32(&frame->info, info))
519 /* Create the ucontext. */
520 err |= __put_user(0, &frame->uc.uc_flags);
521 err |= __put_user(0, &frame->uc.uc_link);
522 err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
523 err |= __put_user(sas_ss_flags(regs->gprs[15]),
524 &frame->uc.uc_stack.ss_flags);
525 err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
526 err |= save_sigregs32(regs, &frame->uc.uc_mcontext);
527 err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
531 /* Set up to return from userspace. If provided, use a stub
532 already in userspace. */
533 if (ka->sa.sa_flags & SA_RESTORER) {
534 regs->gprs[14] = (__u64) ka->sa.sa_restorer;
536 regs->gprs[14] = (__u64) frame->retcode;
537 err |= __put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn,
538 (u16 __user *)(frame->retcode));
541 /* Set up backchain. */
542 if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
545 /* Set up registers for signal handler */
546 regs->gprs[15] = (__u64) frame;
547 regs->psw.addr = (__u64) ka->sa.sa_handler;
549 regs->gprs[2] = map_signal(sig);
550 regs->gprs[3] = (__u64) &frame->info;
551 regs->gprs[4] = (__u64) &frame->uc;
555 force_sigsegv(sig, current);
560 * OK, we're invoking a handler
564 handle_signal32(unsigned long sig, struct k_sigaction *ka,
565 siginfo_t *info, sigset_t *oldset, struct pt_regs * regs)
569 /* Set up the stack frame */
570 if (ka->sa.sa_flags & SA_SIGINFO)
571 ret = setup_rt_frame32(sig, ka, info, oldset, regs);
573 ret = setup_frame32(sig, ka, oldset, regs);
576 spin_lock_irq(¤t->sighand->siglock);
577 sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
578 if (!(ka->sa.sa_flags & SA_NODEFER))
579 sigaddset(¤t->blocked,sig);
581 spin_unlock_irq(¤t->sighand->siglock);