Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [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 |
Martin Michlmayr | dda73d0 | 2006-02-18 15:21:30 +0000 | [diff] [blame] | 7 | * Copyright (C) 1994 - 2000, 2006 Ralf Baechle |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * Copyright (C) 1999, 2000 Silicon Graphics, Inc. |
Harvey Hunt | d1e63c9 | 2016-06-17 16:03:45 +0100 | [diff] [blame] | 9 | * Copyright (C) 2016, Imagination Technologies Ltd. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | */ |
Harvey Hunt | d1e63c9 | 2016-06-17 16:03:45 +0100 | [diff] [blame] | 11 | #include <linux/compiler.h> |
| 12 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/kernel.h> |
| 14 | #include <linux/signal.h> |
| 15 | #include <linux/syscalls.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
Harvey Hunt | d1e63c9 | 2016-06-17 16:03:45 +0100 | [diff] [blame] | 17 | #include <asm/compat.h> |
Ralf Baechle | 431dc80 | 2007-02-13 00:05:11 +0000 | [diff] [blame] | 18 | #include <asm/compat-signal.h> |
Harvey Hunt | d1e63c9 | 2016-06-17 16:03:45 +0100 | [diff] [blame] | 19 | #include <asm/uaccess.h> |
| 20 | #include <asm/unistd.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
Franck Bui-Huu | 36a1f2c2 | 2007-02-05 15:24:22 +0100 | [diff] [blame] | 22 | #include "signal-common.h" |
| 23 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | /* 32-bit compatibility types */ |
| 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | typedef unsigned int __sighandler32_t; |
| 27 | typedef void (*vfptr_t)(void); |
| 28 | |
Franck Bui-Huu | 9432a9b | 2007-02-05 15:24:25 +0100 | [diff] [blame] | 29 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | * Atomically swap in the new signal mask, and wait for a signal. |
| 31 | */ |
| 32 | |
Al Viro | 1910f4a | 2012-12-25 16:25:18 -0500 | [diff] [blame] | 33 | asmlinkage int sys32_sigsuspend(compat_sigset_t __user *uset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | { |
Al Viro | 1910f4a | 2012-12-25 16:25:18 -0500 | [diff] [blame] | 35 | return compat_sys_rt_sigsuspend(uset, sizeof(compat_sigset_t)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | } |
| 37 | |
Al Viro | aa58480 | 2012-12-25 18:55:27 -0500 | [diff] [blame] | 38 | SYSCALL_DEFINE3(32_sigaction, long, sig, const struct compat_sigaction __user *, act, |
| 39 | struct compat_sigaction __user *, oact) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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; |
Ralf Baechle | 77c728c | 2005-03-04 19:36:51 +0000 | [diff] [blame] | 47 | s32 handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | if (!access_ok(VERIFY_READ, act, sizeof(*act))) |
| 50 | return -EFAULT; |
Ralf Baechle | 77c728c | 2005-03-04 19:36:51 +0000 | [diff] [blame] | 51 | err |= __get_user(handler, &act->sa_handler); |
Atsushi Nemoto | 9bbf28a3 | 2006-02-01 01:41:09 +0900 | [diff] [blame] | 52 | new_ka.sa.sa_handler = (void __user *)(s64)handler; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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))) |
Martin Michlmayr | 6254944 | 2006-02-18 20:06:32 +0000 | [diff] [blame] | 65 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | err |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); |
| 67 | err |= __put_user((u32)(u64)old_ka.sa.sa_handler, |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 68 | &oact->sa_handler); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | err |= __put_user(old_ka.sa.sa_mask.sig[0], oact->sa_mask.sig); |
Martin Michlmayr | 6254944 | 2006-02-18 20:06:32 +0000 | [diff] [blame] | 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) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | return -EFAULT; |
| 75 | } |
| 76 | |
| 77 | return ret; |
| 78 | } |
| 79 | |
Al Viro | ce39596 | 2013-10-13 17:23:53 -0400 | [diff] [blame] | 80 | int copy_siginfo_to_user32(compat_siginfo_t __user *to, const siginfo_t *from) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | { |
| 82 | int err; |
| 83 | |
| 84 | if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t))) |
| 85 | return -EFAULT; |
| 86 | |
| 87 | /* If you change siginfo_t structure, please be sure |
| 88 | this code is fixed accordingly. |
| 89 | It should never copy any pad contained in the structure |
| 90 | to avoid security leaks, but must copy the generic |
| 91 | 3 ints plus the relevant union member. |
| 92 | This routine must convert siginfo from 64bit to 32bit as well |
| 93 | at the same time. */ |
| 94 | err = __put_user(from->si_signo, &to->si_signo); |
| 95 | err |= __put_user(from->si_errno, &to->si_errno); |
| 96 | err |= __put_user((short)from->si_code, &to->si_code); |
| 97 | if (from->si_code < 0) |
| 98 | err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, SI_PAD_SIZE); |
| 99 | else { |
| 100 | switch (from->si_code >> 16) { |
Ralf Baechle | a982099 | 2005-02-16 21:24:16 +0000 | [diff] [blame] | 101 | case __SI_TIMER >> 16: |
| 102 | err |= __put_user(from->si_tid, &to->si_tid); |
| 103 | err |= __put_user(from->si_overrun, &to->si_overrun); |
| 104 | err |= __put_user(from->si_int, &to->si_int); |
| 105 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | case __SI_CHLD >> 16: |
| 107 | err |= __put_user(from->si_utime, &to->si_utime); |
| 108 | err |= __put_user(from->si_stime, &to->si_stime); |
| 109 | err |= __put_user(from->si_status, &to->si_status); |
| 110 | default: |
| 111 | err |= __put_user(from->si_pid, &to->si_pid); |
| 112 | err |= __put_user(from->si_uid, &to->si_uid); |
| 113 | break; |
| 114 | case __SI_FAULT >> 16: |
Atsushi Nemoto | 5665a0a | 2006-02-02 01:26:34 +0900 | [diff] [blame] | 115 | err |= __put_user((unsigned long)from->si_addr, &to->si_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | break; |
| 117 | case __SI_POLL >> 16: |
| 118 | err |= __put_user(from->si_band, &to->si_band); |
| 119 | err |= __put_user(from->si_fd, &to->si_fd); |
| 120 | break; |
| 121 | case __SI_RT >> 16: /* This is not generated by the kernel as of now. */ |
| 122 | case __SI_MESGQ >> 16: |
| 123 | err |= __put_user(from->si_pid, &to->si_pid); |
| 124 | err |= __put_user(from->si_uid, &to->si_uid); |
| 125 | err |= __put_user(from->si_int, &to->si_int); |
| 126 | break; |
Matt Redfearn | 5050e91 | 2016-03-29 09:35:30 +0100 | [diff] [blame] | 127 | case __SI_SYS >> 16: |
| 128 | err |= __copy_to_user(&to->si_call_addr, &from->si_call_addr, |
| 129 | sizeof(compat_uptr_t)); |
| 130 | err |= __put_user(from->si_syscall, &to->si_syscall); |
| 131 | err |= __put_user(from->si_arch, &to->si_arch); |
| 132 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | } |
| 134 | } |
| 135 | return err; |
| 136 | } |
| 137 | |
Thomas Bogendoerfer | 5d9a76c | 2008-08-17 16:49:25 +0200 | [diff] [blame] | 138 | int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) |
| 139 | { |
Thomas Bogendoerfer | 5d9a76c | 2008-08-17 16:49:25 +0200 | [diff] [blame] | 140 | if (copy_from_user(to, from, 3*sizeof(int)) || |
| 141 | copy_from_user(to->_sifields._pad, |
| 142 | from->_sifields._pad, SI_PAD_SIZE32)) |
| 143 | return -EFAULT; |
| 144 | |
| 145 | return 0; |
| 146 | } |