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 
sys32_sigsuspend(compat_sigset_t __user * uset)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 }
79