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(set: &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 | |