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 #include <asm/syscalls.h>
  22
  23 #include "signal-common.h"
  24
  25 /* 32-bit compatibility types */
  26
  27 typedef unsigned int __sighandler32_t;
  28 typedef void (*vfptr_t)(void);
  29
  30 /*
  31  * Atomically swap in the new signal mask, and wait for a signal.
  32  */
  33
  34 asmlinkage int sys32_sigsuspend(compat_sigset_t __user *uset)
  35 {
  36         return compat_sys_rt_sigsuspend(uset, sizeof(compat_sigset_t));
  37 }
  38
  39 SYSCALL_DEFINE3(32_sigaction, long, sig, const struct compat_sigaction __user *, act,
  40         struct compat_sigaction __user *, oact)
  41 {
  42         struct k_sigaction new_ka, old_ka;
  43         int ret;
  44         int err = 0;
  45
  46         if (act) {
  47                 old_sigset_t mask;
  48                 s32 handler;
  49
  50                 if (!access_ok(act, sizeof(*act)))
  51                         return -EFAULT;
  52                 err |= __get_user(handler, &act->sa_handler);
  53                 new_ka.sa.sa_handler = (void __user *)(s64)handler;
  54                 err |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
  55                 err |= __get_user(mask, &act->sa_mask.sig[0]);
  56                 if (err)
  57                         return -EFAULT;
  58
  59                 siginitset(&new_ka.sa.sa_mask, mask);
  60         }
  61
  62         ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
  63
  64         if (!ret && oact) {
  65                 if (!access_ok(oact, sizeof(*oact)))
  66                         return -EFAULT;
  67                 err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
  68                 err |= __put_user((u32)(u64)old_ka.sa.sa_handler,
  69                                   &oact->sa_handler);
  70                 err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig);
  71                 err |= __put_user(0, &oact->sa_mask.sig[1]);
  72                 err |= __put_user(0, &oact->sa_mask.sig[2]);
  73                 err |= __put_user(0, &oact->sa_mask.sig[3]);
  74                 if (err)
  75                         return -EFAULT;
  76         }
  77
  78         return ret;
  79 }