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compat_signal.c

/*
 *  arch/s390/kernel/compat_signal.c
 *
 *    Copyright (C) IBM Corp. 2000,2006
 *    Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
 *               Gerhard Tonn (ton@de.ibm.com)                  
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  1997-11-28  Modified for POSIX.1b signals by Richard Henderson
 */

#include <linux/compat.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/errno.h>
#include <linux/wait.h>
#include <linux/ptrace.h>
#include <linux/unistd.h>
#include <linux/stddef.h>
#include <linux/tty.h>
#include <linux/personality.h>
#include <linux/binfmts.h>
#include <asm/ucontext.h>
#include <asm/uaccess.h>
#include <asm/lowcore.h>
#include "compat_linux.h"
#include "compat_ptrace.h"
#include "entry.h"

#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))

typedef struct 
{
      __u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
      struct sigcontext32 sc;
      _sigregs32 sregs;
      int signo;
      __u8 retcode[S390_SYSCALL_SIZE];
} sigframe32;

typedef struct 
{
      __u8 callee_used_stack[__SIGNAL_FRAMESIZE32];
      __u8 retcode[S390_SYSCALL_SIZE];
      compat_siginfo_t info;
      struct ucontext32 uc;
} rt_sigframe32;

int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
{
      int err;

      if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
            return -EFAULT;

      /* If you change siginfo_t structure, please be sure
         this code is fixed accordingly.
         It should never copy any pad contained in the structure
         to avoid security leaks, but must copy the generic
         3 ints plus the relevant union member.  
         This routine must convert siginfo from 64bit to 32bit as well
         at the same time.  */
      err = __put_user(from->si_signo, &to->si_signo);
      err |= __put_user(from->si_errno, &to->si_errno);
      err |= __put_user((short)from->si_code, &to->si_code);
      if (from->si_code < 0)
            err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
      else {
            switch (from->si_code >> 16) {
            case __SI_RT >> 16: /* This is not generated by the kernel as of now.  */
            case __SI_MESGQ >> 16:
                  err |= __put_user(from->si_int, &to->si_int);
                  /* fallthrough */
            case __SI_KILL >> 16:
                  err |= __put_user(from->si_pid, &to->si_pid);
                  err |= __put_user(from->si_uid, &to->si_uid);
                  break;
            case __SI_CHLD >> 16:
                  err |= __put_user(from->si_pid, &to->si_pid);
                  err |= __put_user(from->si_uid, &to->si_uid);
                  err |= __put_user(from->si_utime, &to->si_utime);
                  err |= __put_user(from->si_stime, &to->si_stime);
                  err |= __put_user(from->si_status, &to->si_status);
                  break;
            case __SI_FAULT >> 16:
                  err |= __put_user((unsigned long) from->si_addr,
                                &to->si_addr);
                  break;
            case __SI_POLL >> 16:
                  err |= __put_user(from->si_band, &to->si_band);
                  err |= __put_user(from->si_fd, &to->si_fd);
                  break;
            case __SI_TIMER >> 16:
                  err |= __put_user(from->si_tid, &to->si_tid);
                  err |= __put_user(from->si_overrun, &to->si_overrun);
                  err |= __put_user(from->si_int, &to->si_int);
                  break;
            default:
                  break;
            }
      }
      return err;
}

int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
{
      int err;
      u32 tmp;

      if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t)))
            return -EFAULT;

      err = __get_user(to->si_signo, &from->si_signo);
      err |= __get_user(to->si_errno, &from->si_errno);
      err |= __get_user(to->si_code, &from->si_code);

      if (to->si_code < 0)
            err |= __copy_from_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE);
      else {
            switch (to->si_code >> 16) {
            case __SI_RT >> 16: /* This is not generated by the kernel as of now.  */
            case __SI_MESGQ >> 16:
                  err |= __get_user(to->si_int, &from->si_int);
                  /* fallthrough */
            case __SI_KILL >> 16:
                  err |= __get_user(to->si_pid, &from->si_pid);
                  err |= __get_user(to->si_uid, &from->si_uid);
                  break;
            case __SI_CHLD >> 16:
                  err |= __get_user(to->si_pid, &from->si_pid);
                  err |= __get_user(to->si_uid, &from->si_uid);
                  err |= __get_user(to->si_utime, &from->si_utime);
                  err |= __get_user(to->si_stime, &from->si_stime);
                  err |= __get_user(to->si_status, &from->si_status);
                  break;
            case __SI_FAULT >> 16:
                  err |= __get_user(tmp, &from->si_addr);
                  to->si_addr = (void __user *)(u64) (tmp & PSW32_ADDR_INSN);
                  break;
            case __SI_POLL >> 16:
                  err |= __get_user(to->si_band, &from->si_band);
                  err |= __get_user(to->si_fd, &from->si_fd);
                  break;
            case __SI_TIMER >> 16:
                  err |= __get_user(to->si_tid, &from->si_tid);
                  err |= __get_user(to->si_overrun, &from->si_overrun);
                  err |= __get_user(to->si_int, &from->si_int);
                  break;
            default:
                  break;
            }
      }
      return err;
}

asmlinkage long
sys32_sigaction(int sig, const struct old_sigaction32 __user *act,
             struct old_sigaction32 __user *oact)
{
        struct k_sigaction new_ka, old_ka;
      unsigned long sa_handler, sa_restorer;
        int ret;

        if (act) {
            compat_old_sigset_t mask;
            if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
                __get_user(sa_handler, &act->sa_handler) ||
                __get_user(sa_restorer, &act->sa_restorer) ||
                __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
                __get_user(mask, &act->sa_mask))
                  return -EFAULT;
            new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
            new_ka.sa.sa_restorer = (void (*)(void)) sa_restorer;
            siginitset(&new_ka.sa.sa_mask, mask);
        }

        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

      if (!ret && oact) {
            sa_handler = (unsigned long) old_ka.sa.sa_handler;
            sa_restorer = (unsigned long) old_ka.sa.sa_restorer;
            if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
                __put_user(sa_handler, &oact->sa_handler) ||
                __put_user(sa_restorer, &oact->sa_restorer) ||
                __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
                __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
                  return -EFAULT;
        }

      return ret;
}

asmlinkage long
sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
         struct sigaction32 __user *oact,  size_t sigsetsize)
{
      struct k_sigaction new_ka, old_ka;
      unsigned long sa_handler;
      int ret;
      compat_sigset_t set32;

      /* XXX: Don't preclude handling different sized sigset_t's.  */
      if (sigsetsize != sizeof(compat_sigset_t))
            return -EINVAL;

      if (act) {
            ret = get_user(sa_handler, &act->sa_handler);
            ret |= __copy_from_user(&set32, &act->sa_mask,
                              sizeof(compat_sigset_t));
            switch (_NSIG_WORDS) {
            case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6]
                        | (((long)set32.sig[7]) << 32);
            case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4]
                        | (((long)set32.sig[5]) << 32);
            case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2]
                        | (((long)set32.sig[3]) << 32);
            case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0]
                        | (((long)set32.sig[1]) << 32);
            }
            ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
            
            if (ret)
                  return -EFAULT;
            new_ka.sa.sa_handler = (__sighandler_t) sa_handler;
      }

      ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);

      if (!ret && oact) {
            switch (_NSIG_WORDS) {
            case 4:
                  set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32);
                  set32.sig[6] = old_ka.sa.sa_mask.sig[3];
            case 3:
                  set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32);
                  set32.sig[4] = old_ka.sa.sa_mask.sig[2];
            case 2:
                  set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32);
                  set32.sig[2] = old_ka.sa.sa_mask.sig[1];
            case 1:
                  set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
                  set32.sig[0] = old_ka.sa.sa_mask.sig[0];
            }
            ret = put_user((unsigned long)old_ka.sa.sa_handler, &oact->sa_handler);
            ret |= __copy_to_user(&oact->sa_mask, &set32,
                              sizeof(compat_sigset_t));
            ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
      }

      return ret;
}

asmlinkage long
sys32_sigaltstack(const stack_t32 __user *uss, stack_t32 __user *uoss)
{
      struct pt_regs *regs = task_pt_regs(current);
      stack_t kss, koss;
      unsigned long ss_sp;
      int ret, err = 0;
      mm_segment_t old_fs = get_fs();

      if (uss) {
            if (!access_ok(VERIFY_READ, uss, sizeof(*uss)))
                  return -EFAULT;
            err |= __get_user(ss_sp, &uss->ss_sp);
            err |= __get_user(kss.ss_size, &uss->ss_size);
            err |= __get_user(kss.ss_flags, &uss->ss_flags);
            if (err)
                  return -EFAULT;
            kss.ss_sp = (void __user *) ss_sp;
      }

      set_fs (KERNEL_DS);
      ret = do_sigaltstack((stack_t __force __user *) (uss ? &kss : NULL),
                       (stack_t __force __user *) (uoss ? &koss : NULL),
                       regs->gprs[15]);
      set_fs (old_fs);

      if (!ret && uoss) {
            if (!access_ok(VERIFY_WRITE, uoss, sizeof(*uoss)))
                  return -EFAULT;
            ss_sp = (unsigned long) koss.ss_sp;
            err |= __put_user(ss_sp, &uoss->ss_sp);
            err |= __put_user(koss.ss_size, &uoss->ss_size);
            err |= __put_user(koss.ss_flags, &uoss->ss_flags);
            if (err)
                  return -EFAULT;
      }
      return ret;
}

static int save_sigregs32(struct pt_regs *regs, _sigregs32 __user *sregs)
{
      _s390_regs_common32 regs32;
      int err, i;

      regs32.psw.mask = PSW32_MASK_MERGE(psw32_user_bits,
                                 (__u32)(regs->psw.mask >> 32));
      regs32.psw.addr = PSW32_ADDR_AMODE31 | (__u32) regs->psw.addr;
      for (i = 0; i < NUM_GPRS; i++)
            regs32.gprs[i] = (__u32) regs->gprs[i];
      save_access_regs(current->thread.acrs);
      memcpy(regs32.acrs, current->thread.acrs, sizeof(regs32.acrs));
      err = __copy_to_user(&sregs->regs, &regs32, sizeof(regs32));
      if (err)
            return err;
      save_fp_regs(&current->thread.fp_regs);
      /* s390_fp_regs and _s390_fp_regs32 are the same ! */
      return __copy_to_user(&sregs->fpregs, &current->thread.fp_regs,
                        sizeof(_s390_fp_regs32));
}

static int restore_sigregs32(struct pt_regs *regs,_sigregs32 __user *sregs)
{
      _s390_regs_common32 regs32;
      int err, i;

      /* Alwys make any pending restarted system call return -EINTR */
      current_thread_info()->restart_block.fn = do_no_restart_syscall;

      err = __copy_from_user(&regs32, &sregs->regs, sizeof(regs32));
      if (err)
            return err;
      regs->psw.mask = PSW_MASK_MERGE(regs->psw.mask,
                                (__u64)regs32.psw.mask << 32);
      regs->psw.addr = (__u64)(regs32.psw.addr & PSW32_ADDR_INSN);
      for (i = 0; i < NUM_GPRS; i++)
            regs->gprs[i] = (__u64) regs32.gprs[i];
      memcpy(current->thread.acrs, regs32.acrs, sizeof(current->thread.acrs));
      restore_access_regs(current->thread.acrs);

      err = __copy_from_user(&current->thread.fp_regs, &sregs->fpregs,
                         sizeof(_s390_fp_regs32));
      current->thread.fp_regs.fpc &= FPC_VALID_MASK;
      if (err)
            return err;

      restore_fp_regs(&current->thread.fp_regs);
      regs->trap = -1;  /* disable syscall checks */
      return 0;
}

asmlinkage long sys32_sigreturn(void)
{
      struct pt_regs *regs = task_pt_regs(current);
      sigframe32 __user *frame = (sigframe32 __user *)regs->gprs[15];
      sigset_t set;

      if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
            goto badframe;
      if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE32))
            goto badframe;

      sigdelsetmask(&set, ~_BLOCKABLE);
      spin_lock_irq(&current->sighand->siglock);
      current->blocked = set;
      recalc_sigpending();
      spin_unlock_irq(&current->sighand->siglock);

      if (restore_sigregs32(regs, &frame->sregs))
            goto badframe;

      return regs->gprs[2];

badframe:
      force_sig(SIGSEGV, current);
      return 0;
}

asmlinkage long sys32_rt_sigreturn(void)
{
      struct pt_regs *regs = task_pt_regs(current);
      rt_sigframe32 __user *frame = (rt_sigframe32 __user *)regs->gprs[15];
      sigset_t set;
      stack_t st;
      __u32 ss_sp;
      int err;
      mm_segment_t old_fs = get_fs();

      if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
            goto badframe;
      if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
            goto badframe;

      sigdelsetmask(&set, ~_BLOCKABLE);
      spin_lock_irq(&current->sighand->siglock);
      current->blocked = set;
      recalc_sigpending();
      spin_unlock_irq(&current->sighand->siglock);

      if (restore_sigregs32(regs, &frame->uc.uc_mcontext))
            goto badframe;

      err = __get_user(ss_sp, &frame->uc.uc_stack.ss_sp);
      st.ss_sp = compat_ptr(ss_sp);
      err |= __get_user(st.ss_size, &frame->uc.uc_stack.ss_size);
      err |= __get_user(st.ss_flags, &frame->uc.uc_stack.ss_flags);
      if (err)
            goto badframe; 

      set_fs (KERNEL_DS);
      do_sigaltstack((stack_t __force __user *)&st, NULL, regs->gprs[15]);
      set_fs (old_fs);

      return regs->gprs[2];

badframe:
      force_sig(SIGSEGV, current);
      return 0;
}     

/*
 * Set up a signal frame.
 */


/*
 * Determine which stack to use..
 */
static inline void __user *
get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
{
      unsigned long sp;

      /* Default to using normal stack */
      sp = (unsigned long) A(regs->gprs[15]);

      /* Overflow on alternate signal stack gives SIGSEGV. */
      if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL))
            return (void __user *) -1UL;

      /* This is the X/Open sanctioned signal stack switching.  */
      if (ka->sa.sa_flags & SA_ONSTACK) {
            if (! sas_ss_flags(sp))
                  sp = current->sas_ss_sp + current->sas_ss_size;
      }

      /* This is the legacy signal stack switching. */
      else if (!user_mode(regs) &&
             !(ka->sa.sa_flags & SA_RESTORER) &&
             ka->sa.sa_restorer) {
            sp = (unsigned long) ka->sa.sa_restorer;
      }

      return (void __user *)((sp - frame_size) & -8ul);
}

static inline int map_signal(int sig)
{
      if (current_thread_info()->exec_domain
          && current_thread_info()->exec_domain->signal_invmap
          && sig < 32)
            return current_thread_info()->exec_domain->signal_invmap[sig];
        else
            return sig;
}

static int setup_frame32(int sig, struct k_sigaction *ka,
                  sigset_t *set, struct pt_regs * regs)
{
      sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(sigframe32));
      if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe32)))
            goto give_sigsegv;

      if (frame == (void __user *) -1UL)
            goto give_sigsegv;

      if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE32))
            goto give_sigsegv;

      if (save_sigregs32(regs, &frame->sregs))
            goto give_sigsegv;
      if (__put_user((unsigned long) &frame->sregs, &frame->sc.sregs))
            goto give_sigsegv;

      /* Set up to return from userspace.  If provided, use a stub
         already in userspace.  */
      if (ka->sa.sa_flags & SA_RESTORER) {
            regs->gprs[14] = (__u64) ka->sa.sa_restorer;
      } else {
            regs->gprs[14] = (__u64) frame->retcode;
            if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn,
                           (u16 __user *)(frame->retcode)))
                  goto give_sigsegv;
        }

      /* Set up backchain. */
      if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
            goto give_sigsegv;

      /* Set up registers for signal handler */
      regs->gprs[15] = (__u64) frame;
      regs->psw.addr = (__u64) ka->sa.sa_handler;

      regs->gprs[2] = map_signal(sig);
      regs->gprs[3] = (__u64) &frame->sc;

      /* We forgot to include these in the sigcontext.
         To avoid breaking binary compatibility, they are passed as args. */
      regs->gprs[4] = current->thread.trap_no;
      regs->gprs[5] = current->thread.prot_addr;

      /* Place signal number on stack to allow backtrace from handler.  */
      if (__put_user(regs->gprs[2], (int __user *) &frame->signo))
            goto give_sigsegv;
      return 0;

give_sigsegv:
      force_sigsegv(sig, current);
      return -EFAULT;
}

static int setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info,
                     sigset_t *set, struct pt_regs * regs)
{
      int err = 0;
      rt_sigframe32 __user *frame = get_sigframe(ka, regs, sizeof(rt_sigframe32));
      if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe32)))
            goto give_sigsegv;

      if (frame == (void __user *) -1UL)
            goto give_sigsegv;

      if (copy_siginfo_to_user32(&frame->info, info))
            goto give_sigsegv;

      /* Create the ucontext.  */
      err |= __put_user(0, &frame->uc.uc_flags);
      err |= __put_user(0, &frame->uc.uc_link);
      err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
      err |= __put_user(sas_ss_flags(regs->gprs[15]),
                        &frame->uc.uc_stack.ss_flags);
      err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
      err |= save_sigregs32(regs, &frame->uc.uc_mcontext);
      err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
      if (err)
            goto give_sigsegv;

      /* Set up to return from userspace.  If provided, use a stub
         already in userspace.  */
      if (ka->sa.sa_flags & SA_RESTORER) {
            regs->gprs[14] = (__u64) ka->sa.sa_restorer;
      } else {
            regs->gprs[14] = (__u64) frame->retcode;
            err |= __put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn,
                              (u16 __user *)(frame->retcode));
      }

      /* Set up backchain. */
      if (__put_user(regs->gprs[15], (unsigned int __user *) frame))
            goto give_sigsegv;

      /* Set up registers for signal handler */
      regs->gprs[15] = (__u64) frame;
      regs->psw.addr = (__u64) ka->sa.sa_handler;

      regs->gprs[2] = map_signal(sig);
      regs->gprs[3] = (__u64) &frame->info;
      regs->gprs[4] = (__u64) &frame->uc;
      return 0;

give_sigsegv:
      force_sigsegv(sig, current);
      return -EFAULT;
}

/*
 * OK, we're invoking a handler
 */   

int
handle_signal32(unsigned long sig, struct k_sigaction *ka,
            siginfo_t *info, sigset_t *oldset, struct pt_regs * regs)
{
      int ret;

      /* Set up the stack frame */
      if (ka->sa.sa_flags & SA_SIGINFO)
            ret = setup_rt_frame32(sig, ka, info, oldset, regs);
      else
            ret = setup_frame32(sig, ka, oldset, regs);

      if (ret == 0) {
            spin_lock_irq(&current->sighand->siglock);
            sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
            if (!(ka->sa.sa_flags & SA_NODEFER))
                  sigaddset(&current->blocked,sig);
            recalc_sigpending();
            spin_unlock_irq(&current->sighand->siglock);
      }
      return ret;
}


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