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
  26 typedef unsigned int __sighandler32_t;
  27 typedef void (*vfptr_t)(void);
  28
  29 /*
  30  * Atomically swap in the new signal mask, and wait for a signal.
  31  */
  32
  33 asmlinkage int sys32_sigsuspend(compat_sigset_t __user *uset)
  34 {
  35         return compat_sys_rt_sigsuspend(uset, sizeof(compat_sigset_t));
  36 }
  37
  38 SYSCALL_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 }