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signal32.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1991, 1992  Linus Torvalds
 * Copyright (C) 1994 - 2000, 2006  Ralf Baechle
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 */
#include <linux/cache.h>
#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/syscalls.h>
#include <linux/errno.h>
#include <linux/wait.h>
#include <linux/ptrace.h>
#include <linux/suspend.h>
#include <linux/compiler.h>
#include <linux/uaccess.h>

#include <asm/abi.h>
#include <asm/asm.h>
#include <asm/compat-signal.h>
#include <linux/bitops.h>
#include <asm/cacheflush.h>
#include <asm/sim.h>
#include <asm/ucontext.h>
#include <asm/system.h>
#include <asm/fpu.h>
#include <asm/war.h>

#include "signal-common.h"

/*
 * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
 */
#define __NR_O32_sigreturn          4119
#define __NR_O32_rt_sigreturn       4193
#define __NR_O32_restart_syscall        4253

/* 32-bit compatibility types */

typedef unsigned int __sighandler32_t;
typedef void (*vfptr_t)(void);

struct sigaction32 {
      unsigned int            sa_flags;
      __sighandler32_t  sa_handler;
      compat_sigset_t         sa_mask;
};

/* IRIX compatible stack_t  */
typedef struct sigaltstack32 {
      s32 ss_sp;
      compat_size_t ss_size;
      int ss_flags;
} stack32_t;

struct ucontext32 {
      u32                 uc_flags;
      s32                 uc_link;
      stack32_t           uc_stack;
      struct sigcontext32 uc_mcontext;
      compat_sigset_t     uc_sigmask;   /* mask last for extensibility */
};

/*
 * Horribly complicated - with the bloody RM9000 workarounds enabled
 * the signal trampolines is moving to the end of the structure so we can
 * increase the alignment without breaking software compatibility.
 */
#if ICACHE_REFILLS_WORKAROUND_WAR == 0

struct sigframe32 {
      u32 sf_ass[4];          /* argument save space for o32 */
      u32 sf_code[2];         /* signal trampoline */
      struct sigcontext32 sf_sc;
      compat_sigset_t sf_mask;
};

struct rt_sigframe32 {
      u32 rs_ass[4];                /* argument save space for o32 */
      u32 rs_code[2];               /* signal trampoline */
      compat_siginfo_t rs_info;
      struct ucontext32 rs_uc;
};

#else  /* ICACHE_REFILLS_WORKAROUND_WAR */

struct sigframe32 {
      u32 sf_ass[4];                /* argument save space for o32 */
      u32 sf_pad[2];
      struct sigcontext32 sf_sc;    /* hw context */
      compat_sigset_t sf_mask;
      u32 sf_code[8] ____cacheline_aligned;     /* signal trampoline */
};

struct rt_sigframe32 {
      u32 rs_ass[4];                /* argument save space for o32 */
      u32 rs_pad[2];
      compat_siginfo_t rs_info;
      struct ucontext32 rs_uc;
      u32 rs_code[8] __attribute__((aligned(32)));    /* signal trampoline */
};

#endif      /* !ICACHE_REFILLS_WORKAROUND_WAR */

/*
 * sigcontext handlers
 */
static int protected_save_fp_context32(struct sigcontext32 __user *sc)
{
      int err;
      while (1) {
            lock_fpu_owner();
            own_fpu_inatomic(1);
            err = save_fp_context32(sc); /* this might fail */
            unlock_fpu_owner();
            if (likely(!err))
                  break;
            /* touch the sigcontext and try again */
            err = __put_user(0, &sc->sc_fpregs[0]) |
                  __put_user(0, &sc->sc_fpregs[31]) |
                  __put_user(0, &sc->sc_fpc_csr);
            if (err)
                  break;      /* really bad sigcontext */
      }
      return err;
}

static int protected_restore_fp_context32(struct sigcontext32 __user *sc)
{
      int err, tmp;
      while (1) {
            lock_fpu_owner();
            own_fpu_inatomic(0);
            err = restore_fp_context32(sc); /* this might fail */
            unlock_fpu_owner();
            if (likely(!err))
                  break;
            /* touch the sigcontext and try again */
            err = __get_user(tmp, &sc->sc_fpregs[0]) |
                  __get_user(tmp, &sc->sc_fpregs[31]) |
                  __get_user(tmp, &sc->sc_fpc_csr);
            if (err)
                  break;      /* really bad sigcontext */
      }
      return err;
}

static int setup_sigcontext32(struct pt_regs *regs,
                        struct sigcontext32 __user *sc)
{
      int err = 0;
      int i;
      u32 used_math;

      err |= __put_user(regs->cp0_epc, &sc->sc_pc);

      err |= __put_user(0, &sc->sc_regs[0]);
      for (i = 1; i < 32; i++)
            err |= __put_user(regs->regs[i], &sc->sc_regs[i]);

      err |= __put_user(regs->hi, &sc->sc_mdhi);
      err |= __put_user(regs->lo, &sc->sc_mdlo);
      if (cpu_has_dsp) {
            err |= __put_user(rddsp(DSP_MASK), &sc->sc_dsp);
            err |= __put_user(mfhi1(), &sc->sc_hi1);
            err |= __put_user(mflo1(), &sc->sc_lo1);
            err |= __put_user(mfhi2(), &sc->sc_hi2);
            err |= __put_user(mflo2(), &sc->sc_lo2);
            err |= __put_user(mfhi3(), &sc->sc_hi3);
            err |= __put_user(mflo3(), &sc->sc_lo3);
      }

      used_math = !!used_math();
      err |= __put_user(used_math, &sc->sc_used_math);

      if (used_math) {
            /*
             * Save FPU state to signal context.  Signal handler
             * will "inherit" current FPU state.
             */
            err |= protected_save_fp_context32(sc);
      }
      return err;
}

static int
check_and_restore_fp_context32(struct sigcontext32 __user *sc)
{
      int err, sig;

      err = sig = fpcsr_pending(&sc->sc_fpc_csr);
      if (err > 0)
            err = 0;
      err |= protected_restore_fp_context32(sc);
      return err ?: sig;
}

static int restore_sigcontext32(struct pt_regs *regs,
                        struct sigcontext32 __user *sc)
{
      u32 used_math;
      int err = 0;
      s32 treg;
      int i;

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

      err |= __get_user(regs->cp0_epc, &sc->sc_pc);
      err |= __get_user(regs->hi, &sc->sc_mdhi);
      err |= __get_user(regs->lo, &sc->sc_mdlo);
      if (cpu_has_dsp) {
            err |= __get_user(treg, &sc->sc_hi1); mthi1(treg);
            err |= __get_user(treg, &sc->sc_lo1); mtlo1(treg);
            err |= __get_user(treg, &sc->sc_hi2); mthi2(treg);
            err |= __get_user(treg, &sc->sc_lo2); mtlo2(treg);
            err |= __get_user(treg, &sc->sc_hi3); mthi3(treg);
            err |= __get_user(treg, &sc->sc_lo3); mtlo3(treg);
            err |= __get_user(treg, &sc->sc_dsp); wrdsp(treg, DSP_MASK);
      }

      for (i = 1; i < 32; i++)
            err |= __get_user(regs->regs[i], &sc->sc_regs[i]);

      err |= __get_user(used_math, &sc->sc_used_math);
      conditional_used_math(used_math);

      if (used_math) {
            /* restore fpu context if we have used it before */
            if (!err)
                  err = check_and_restore_fp_context32(sc);
      } else {
            /* signal handler may have used FPU.  Give it up. */
            lose_fpu(0);
      }

      return err;
}

/*
 *
 */
extern void __put_sigset_unknown_nsig(void);
extern void __get_sigset_unknown_nsig(void);

static inline int put_sigset(const sigset_t *kbuf, compat_sigset_t __user *ubuf)
{
      int err = 0;

      if (!access_ok(VERIFY_WRITE, ubuf, sizeof(*ubuf)))
            return -EFAULT;

      switch (_NSIG_WORDS) {
      default:
            __put_sigset_unknown_nsig();
      case 2:
            err |= __put_user(kbuf->sig[1] >> 32, &ubuf->sig[3]);
            err |= __put_user(kbuf->sig[1] & 0xffffffff, &ubuf->sig[2]);
      case 1:
            err |= __put_user(kbuf->sig[0] >> 32, &ubuf->sig[1]);
            err |= __put_user(kbuf->sig[0] & 0xffffffff, &ubuf->sig[0]);
      }

      return err;
}

static inline int get_sigset(sigset_t *kbuf, const compat_sigset_t __user *ubuf)
{
      int err = 0;
      unsigned long sig[4];

      if (!access_ok(VERIFY_READ, ubuf, sizeof(*ubuf)))
            return -EFAULT;

      switch (_NSIG_WORDS) {
      default:
            __get_sigset_unknown_nsig();
      case 2:
            err |= __get_user(sig[3], &ubuf->sig[3]);
            err |= __get_user(sig[2], &ubuf->sig[2]);
            kbuf->sig[1] = sig[2] | (sig[3] << 32);
      case 1:
            err |= __get_user(sig[1], &ubuf->sig[1]);
            err |= __get_user(sig[0], &ubuf->sig[0]);
            kbuf->sig[0] = sig[0] | (sig[1] << 32);
      }

      return err;
}

/*
 * Atomically swap in the new signal mask, and wait for a signal.
 */

asmlinkage int sys32_sigsuspend(nabi_no_regargs struct pt_regs regs)
{
      compat_sigset_t __user *uset;
      sigset_t newset;

      uset = (compat_sigset_t __user *) regs.regs[4];
      if (get_sigset(&newset, uset))
            return -EFAULT;
      sigdelsetmask(&newset, ~_BLOCKABLE);

      spin_lock_irq(&current->sighand->siglock);
      current->saved_sigmask = current->blocked;
      current->blocked = newset;
      recalc_sigpending();
      spin_unlock_irq(&current->sighand->siglock);

      current->state = TASK_INTERRUPTIBLE;
      schedule();
      set_thread_flag(TIF_RESTORE_SIGMASK);
      return -ERESTARTNOHAND;
}

asmlinkage int sys32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
{
      compat_sigset_t __user *uset;
      sigset_t newset;
      size_t sigsetsize;

      /* XXX Don't preclude handling different sized sigset_t's.  */
      sigsetsize = regs.regs[5];
      if (sigsetsize != sizeof(compat_sigset_t))
            return -EINVAL;

      uset = (compat_sigset_t __user *) regs.regs[4];
      if (get_sigset(&newset, uset))
            return -EFAULT;
      sigdelsetmask(&newset, ~_BLOCKABLE);

      spin_lock_irq(&current->sighand->siglock);
      current->saved_sigmask = current->blocked;
      current->blocked = newset;
      recalc_sigpending();
      spin_unlock_irq(&current->sighand->siglock);

      current->state = TASK_INTERRUPTIBLE;
      schedule();
      set_thread_flag(TIF_RESTORE_SIGMASK);
      return -ERESTARTNOHAND;
}

asmlinkage int sys32_sigaction(int sig, const struct sigaction32 __user *act,
                               struct sigaction32 __user *oact)
{
      struct k_sigaction new_ka, old_ka;
      int ret;
      int err = 0;

      if (act) {
            old_sigset_t mask;
            s32 handler;

            if (!access_ok(VERIFY_READ, act, sizeof(*act)))
                  return -EFAULT;
            err |= __get_user(handler, &act->sa_handler);
            new_ka.sa.sa_handler = (void __user *)(s64)handler;
            err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
            err |= __get_user(mask, &act->sa_mask.sig[0]);
            if (err)
                  return -EFAULT;

            siginitset(&new_ka.sa.sa_mask, mask);
      }

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

      if (!ret && oact) {
            if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
                  return -EFAULT;
            err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
            err |= __put_user((u32)(u64)old_ka.sa.sa_handler,
                              &oact->sa_handler);
            err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
            err |= __put_user(0, &oact->sa_mask.sig[1]);
            err |= __put_user(0, &oact->sa_mask.sig[2]);
            err |= __put_user(0, &oact->sa_mask.sig[3]);
            if (err)
                  return -EFAULT;
      }

      return ret;
}

asmlinkage int sys32_sigaltstack(nabi_no_regargs struct pt_regs regs)
{
      const stack32_t __user *uss = (const stack32_t __user *) regs.regs[4];
      stack32_t __user *uoss = (stack32_t __user *) regs.regs[5];
      unsigned long usp = regs.regs[29];
      stack_t kss, koss;
      int ret, err = 0;
      mm_segment_t old_fs = get_fs();
      s32 sp;

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

      set_fs(KERNEL_DS);
      ret = do_sigaltstack(uss ? (stack_t __user *)&kss : NULL,
                       uoss ? (stack_t __user *)&koss : NULL, usp);
      set_fs(old_fs);

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

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_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;
            case __SI_CHLD >> 16:
                  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);
            default:
                  err |= __put_user(from->si_pid, &to->si_pid);
                  err |= __put_user(from->si_uid, &to->si_uid);
                  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_RT >> 16: /* This is not generated by the kernel as of now.  */
            case __SI_MESGQ >> 16:
                  err |= __put_user(from->si_pid, &to->si_pid);
                  err |= __put_user(from->si_uid, &to->si_uid);
                  err |= __put_user(from->si_int, &to->si_int);
                  break;
            }
      }
      return err;
}

asmlinkage void sys32_sigreturn(nabi_no_regargs struct pt_regs regs)
{
      struct sigframe32 __user *frame;
      sigset_t blocked;
      int sig;

      frame = (struct sigframe32 __user *) regs.regs[29];
      if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
            goto badframe;
      if (__copy_conv_sigset_from_user(&blocked, &frame->sf_mask))
            goto badframe;

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

      sig = restore_sigcontext32(&regs, &frame->sf_sc);
      if (sig < 0)
            goto badframe;
      else if (sig)
            force_sig(sig, current);

      /*
       * Don't let your children do this ...
       */
      __asm__ __volatile__(
            "move\t$29, %0\n\t"
            "j\tsyscall_exit"
            :/* no outputs */
            :"r" (&regs));
      /* Unreached */

badframe:
      force_sig(SIGSEGV, current);
}

asmlinkage void sys32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)
{
      struct rt_sigframe32 __user *frame;
      mm_segment_t old_fs;
      sigset_t set;
      stack_t st;
      s32 sp;
      int sig;

      frame = (struct rt_sigframe32 __user *) regs.regs[29];
      if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
            goto badframe;
      if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
            goto badframe;

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

      sig = restore_sigcontext32(&regs, &frame->rs_uc.uc_mcontext);
      if (sig < 0)
            goto badframe;
      else if (sig)
            force_sig(sig, current);

      /* The ucontext contains a stack32_t, so we must convert!  */
      if (__get_user(sp, &frame->rs_uc.uc_stack.ss_sp))
            goto badframe;
      st.ss_sp = (void __user *)(long) sp;
      if (__get_user(st.ss_size, &frame->rs_uc.uc_stack.ss_size))
            goto badframe;
      if (__get_user(st.ss_flags, &frame->rs_uc.uc_stack.ss_flags))
            goto badframe;

      /* It is more difficult to avoid calling this function than to
         call it and ignore errors.  */
      old_fs = get_fs();
      set_fs(KERNEL_DS);
      do_sigaltstack((stack_t __user *)&st, NULL, regs.regs[29]);
      set_fs(old_fs);

      /*
       * Don't let your children do this ...
       */
      __asm__ __volatile__(
            "move\t$29, %0\n\t"
            "j\tsyscall_exit"
            :/* no outputs */
            :"r" (&regs));
      /* Unreached */

badframe:
      force_sig(SIGSEGV, current);
}

static int setup_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
      int signr, sigset_t *set)
{
      struct sigframe32 __user *frame;
      int err = 0;

      frame = get_sigframe(ka, regs, sizeof(*frame));
      if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
            goto give_sigsegv;

      err |= install_sigtramp(frame->sf_code, __NR_O32_sigreturn);

      err |= setup_sigcontext32(regs, &frame->sf_sc);
      err |= __copy_conv_sigset_to_user(&frame->sf_mask, set);

      if (err)
            goto give_sigsegv;

      /*
       * Arguments to signal handler:
       *
       *   a0 = signal number
       *   a1 = 0 (should be cause)
       *   a2 = pointer to struct sigcontext
       *
       * $25 and c0_epc point to the signal handler, $29 points to the
       * struct sigframe.
       */
      regs->regs[ 4] = signr;
      regs->regs[ 5] = 0;
      regs->regs[ 6] = (unsigned long) &frame->sf_sc;
      regs->regs[29] = (unsigned long) frame;
      regs->regs[31] = (unsigned long) frame->sf_code;
      regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;

      DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
             current->comm, current->pid,
             frame, regs->cp0_epc, regs->regs[31]);

      return 0;

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

static int setup_rt_frame_32(struct k_sigaction * ka, struct pt_regs *regs,
      int signr, sigset_t *set, siginfo_t *info)
{
      struct rt_sigframe32 __user *frame;
      int err = 0;
      s32 sp;

      frame = get_sigframe(ka, regs, sizeof(*frame));
      if (!access_ok(VERIFY_WRITE, frame, sizeof (*frame)))
            goto give_sigsegv;

      err |= install_sigtramp(frame->rs_code, __NR_O32_rt_sigreturn);

      /* Convert (siginfo_t -> compat_siginfo_t) and copy to user. */
      err |= copy_siginfo_to_user32(&frame->rs_info, info);

      /* Create the ucontext.  */
      err |= __put_user(0, &frame->rs_uc.uc_flags);
      err |= __put_user(0, &frame->rs_uc.uc_link);
      sp = (int) (long) current->sas_ss_sp;
      err |= __put_user(sp,
                        &frame->rs_uc.uc_stack.ss_sp);
      err |= __put_user(sas_ss_flags(regs->regs[29]),
                        &frame->rs_uc.uc_stack.ss_flags);
      err |= __put_user(current->sas_ss_size,
                        &frame->rs_uc.uc_stack.ss_size);
      err |= setup_sigcontext32(regs, &frame->rs_uc.uc_mcontext);
      err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);

      if (err)
            goto give_sigsegv;

      /*
       * Arguments to signal handler:
       *
       *   a0 = signal number
       *   a1 = 0 (should be cause)
       *   a2 = pointer to ucontext
       *
       * $25 and c0_epc point to the signal handler, $29 points to
       * the struct rt_sigframe32.
       */
      regs->regs[ 4] = signr;
      regs->regs[ 5] = (unsigned long) &frame->rs_info;
      regs->regs[ 6] = (unsigned long) &frame->rs_uc;
      regs->regs[29] = (unsigned long) frame;
      regs->regs[31] = (unsigned long) frame->rs_code;
      regs->cp0_epc = regs->regs[25] = (unsigned long) ka->sa.sa_handler;

      DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
             current->comm, current->pid,
             frame, regs->cp0_epc, regs->regs[31]);

      return 0;

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

/*
 * o32 compatibility on 64-bit kernels, without DSP ASE
 */
struct mips_abi mips_abi_32 = {
      .setup_frame      = setup_frame_32,
      .setup_rt_frame   = setup_rt_frame_32,
      .restart    = __NR_O32_restart_syscall
};

asmlinkage int sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
                          struct sigaction32 __user *oact,
                          unsigned int sigsetsize)
{
      struct k_sigaction new_sa, old_sa;
      int ret = -EINVAL;

      /* XXX: Don't preclude handling different sized sigset_t's.  */
      if (sigsetsize != sizeof(sigset_t))
            goto out;

      if (act) {
            s32 handler;
            int err = 0;

            if (!access_ok(VERIFY_READ, act, sizeof(*act)))
                  return -EFAULT;
            err |= __get_user(handler, &act->sa_handler);
            new_sa.sa.sa_handler = (void __user *)(s64)handler;
            err |= __get_user(new_sa.sa.sa_flags, &act->sa_flags);
            err |= get_sigset(&new_sa.sa.sa_mask, &act->sa_mask);
            if (err)
                  return -EFAULT;
      }

      ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL);

      if (!ret && oact) {
            int err = 0;

            if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)))
                  return -EFAULT;

            err |= __put_user((u32)(u64)old_sa.sa.sa_handler,
                               &oact->sa_handler);
            err |= __put_user(old_sa.sa.sa_flags, &oact->sa_flags);
            err |= put_sigset(&old_sa.sa.sa_mask, &oact->sa_mask);
            if (err)
                  return -EFAULT;
      }
out:
      return ret;
}

asmlinkage int sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
      compat_sigset_t __user *oset, unsigned int sigsetsize)
{
      sigset_t old_set, new_set;
      int ret;
      mm_segment_t old_fs = get_fs();

      if (set && get_sigset(&new_set, set))
            return -EFAULT;

      set_fs(KERNEL_DS);
      ret = sys_rt_sigprocmask(how, set ? (sigset_t __user *)&new_set : NULL,
                         oset ? (sigset_t __user *)&old_set : NULL,
                         sigsetsize);
      set_fs(old_fs);

      if (!ret && oset && put_sigset(&old_set, oset))
            return -EFAULT;

      return ret;
}

asmlinkage int sys32_rt_sigpending(compat_sigset_t __user *uset,
      unsigned int sigsetsize)
{
      int ret;
      sigset_t set;
      mm_segment_t old_fs = get_fs();

      set_fs(KERNEL_DS);
      ret = sys_rt_sigpending((sigset_t __user *)&set, sigsetsize);
      set_fs(old_fs);

      if (!ret && put_sigset(&set, uset))
            return -EFAULT;

      return ret;
}

asmlinkage int sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
{
      siginfo_t info;
      int ret;
      mm_segment_t old_fs = get_fs();

      if (copy_from_user(&info, uinfo, 3*sizeof(int)) ||
          copy_from_user(info._sifields._pad, uinfo->_sifields._pad, SI_PAD_SIZE))
            return -EFAULT;
      set_fs(KERNEL_DS);
      ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *)&info);
      set_fs(old_fs);
      return ret;
}

asmlinkage long
sys32_waitid(int which, compat_pid_t pid,
           compat_siginfo_t __user *uinfo, int options,
           struct compat_rusage __user *uru)
{
      siginfo_t info;
      struct rusage ru;
      long ret;
      mm_segment_t old_fs = get_fs();

      info.si_signo = 0;
      set_fs(KERNEL_DS);
      ret = sys_waitid(which, pid, (siginfo_t __user *) &info, options,
                   uru ? (struct rusage __user *) &ru : NULL);
      set_fs(old_fs);

      if (ret < 0 || info.si_signo == 0)
            return ret;

      if (uru && (ret = put_compat_rusage(&ru, uru)))
            return ret;

      BUG_ON(info.si_code & __SI_MASK);
      info.si_code |= __SI_CHLD;
      return copy_siginfo_to_user32(uinfo, &info);
}

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