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 }
80
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