| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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(VERIFY_READ, 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(VERIFY_WRITE, 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 | } |