LXR linux/arch/mips/kernel/signal32.c

   1/*
   2 * This file is subject to the terms and conditions of the GNU General Public
   3 * License.  See the file "COPYING" in the main directory of this archive
   4 * for more details.
   5 *
   6 * Copyright (C) 1991, 1992  Linus Torvalds
   7 * Copyright (C) 1994 - 2000, 2006  Ralf Baechle
   8 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
   9 * Copyright (C) 2016, Imagination Technologies Ltd.
  10 */
  11#include <linux/compat.h>
  12#include <linux/compiler.h>
  13#include <linux/errno.h>
  14#include <linux/kernel.h>
  15#include <linux/signal.h>
  16#include <linux/syscalls.h>
  17
  18#include <asm/compat-signal.h>
  19#include <linux/uaccess.h>
  20#include <asm/unistd.h>
  21
  22#include "signal-common.h"
  23
  24/* 32-bit compatibility types */
  25
  26typedef unsigned int __sighandler32_t;
  27typedef void (*vfptr_t)(void);
  28
  29/*
  30 * Atomically swap in the new signal mask, and wait for a signal.
  31 */
  32
  33asmlinkage int sys32_sigsuspend(compat_sigset_t __user *uset)
  34{
  35        return compat_sys_rt_sigsuspend(uset, sizeof(compat_sigset_t));
  36}
  37
  38SYSCALL_DEFINE3(32_sigaction, long, sig, const struct compat_sigaction __user *, act,
  39        struct compat_sigaction __user *, oact)
  40{
  41        struct k_sigaction new_ka, old_ka;
  42        int ret;
  43        int err = 0;
  44
  45        if (act) {
  46                old_sigset_t mask;
  47                s32 handler;
  48
  49                if (!access_ok(act, sizeof(*act)))
  50                        return -EFAULT;
  51                err |= __get_user(handler, &act->sa_handler);
  52                new_ka.sa.sa_handler = (void __user *)(s64)handler;
  53                err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
  54                err |= __get_user(mask, &act->sa_mask.sig[0]);
  55                if (err)
  56                        return -EFAULT;
  57
  58                siginitset(&new_ka.sa.sa_mask, mask);
  59        }
  60
  61        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
  62
  63        if (!ret && oact) {
  64                if (!access_ok(oact, sizeof(*oact)))
  65                        return -EFAULT;
  66                err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
  67                err |= __put_user((u32)(u64)old_ka.sa.sa_handler,
  68                                  &oact->sa_handler);
  69                err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
  70                err |= __put_user(0, &oact->sa_mask.sig[1]);
  71                err |= __put_user(0, &oact->sa_mask.sig[2]);
  72                err |= __put_user(0, &oact->sa_mask.sig[3]);
  73                if (err)
  74                        return -EFAULT;
  75        }
  76
  77        return ret;
  78}
  79