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/arch/mips/kernel/signal32.c

http://github.com/mirrors/linux
C | 78 lines | 51 code | 13 blank | 14 comment | 7 complexity | 0d871fc8084aa028b66d50721b57da6a MD5 | raw file
 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}