1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
|
// SPDX-License-Identifier: GPL-2.0
/*
* sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Based on
* sys_sparc32
*
* Copyright (C) 2000 VA Linux Co
* Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
* Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 2000 Hewlett-Packard Co.
* Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
* Copyright (C) 2000,2001,2002 Andi Kleen, SuSE Labs (x86-64 port)
*
* These routines maintain argument size conversion between 32bit and 64bit
* environment. In 2.5 most of this should be moved to a generic directory.
*
* This file assumes that there is a hole at the end of user address space.
*
* Some of the functions are LE specific currently. These are
* hopefully all marked. This should be fixed.
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/signal.h>
#include <linux/syscalls.h>
#include <linux/times.h>
#include <linux/utsname.h>
#include <linux/mm.h>
#include <linux/uio.h>
#include <linux/poll.h>
#include <linux/personality.h>
#include <linux/stat.h>
#include <linux/rwsem.h>
#include <linux/compat.h>
#include <linux/vfs.h>
#include <linux/ptrace.h>
#include <linux/highuid.h>
#include <linux/sysctl.h>
#include <linux/slab.h>
#include <linux/sched/task.h>
#include <asm/mman.h>
#include <asm/types.h>
#include <linux/uaccess.h>
#include <linux/atomic.h>
#include <asm/vgtod.h>
#include <asm/ia32.h>
#define AA(__x) ((unsigned long)(__x))
SYSCALL_DEFINE3(ia32_truncate64, const char __user *, filename,
unsigned long, offset_low, unsigned long, offset_high)
{
return ksys_truncate(filename,
((loff_t) offset_high << 32) | offset_low);
}
SYSCALL_DEFINE3(ia32_ftruncate64, unsigned int, fd,
unsigned long, offset_low, unsigned long, offset_high)
{
return ksys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low);
}
/* warning: next two assume little endian */
SYSCALL_DEFINE5(ia32_pread64, unsigned int, fd, char __user *, ubuf,
u32, count, u32, poslo, u32, poshi)
{
return ksys_pread64(fd, ubuf, count,
((loff_t)AA(poshi) << 32) | AA(poslo));
}
SYSCALL_DEFINE5(ia32_pwrite64, unsigned int, fd, const char __user *, ubuf,
u32, count, u32, poslo, u32, poshi)
{
return ksys_pwrite64(fd, ubuf, count,
((loff_t)AA(poshi) << 32) | AA(poslo));
}
/*
* Some system calls that need sign extended arguments. This could be
* done by a generic wrapper.
*/
SYSCALL_DEFINE6(ia32_fadvise64_64, int, fd, __u32, offset_low,
__u32, offset_high, __u32, len_low, __u32, len_high,
int, advice)
{
return ksys_fadvise64_64(fd,
(((u64)offset_high)<<32) | offset_low,
(((u64)len_high)<<32) | len_low,
advice);
}
SYSCALL_DEFINE4(ia32_readahead, int, fd, unsigned int, off_lo,
unsigned int, off_hi, size_t, count)
{
return ksys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
}
SYSCALL_DEFINE6(ia32_sync_file_range, int, fd, unsigned int, off_low,
unsigned int, off_hi, unsigned int, n_low,
unsigned int, n_hi, int, flags)
{
return ksys_sync_file_range(fd,
((u64)off_hi << 32) | off_low,
((u64)n_hi << 32) | n_low, flags);
}
SYSCALL_DEFINE5(ia32_fadvise64, int, fd, unsigned int, offset_lo,
unsigned int, offset_hi, size_t, len, int, advice)
{
return ksys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
len, advice);
}
SYSCALL_DEFINE6(ia32_fallocate, int, fd, int, mode,
unsigned int, offset_lo, unsigned int, offset_hi,
unsigned int, len_lo, unsigned int, len_hi)
{
return ksys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
((u64)len_hi << 32) | len_lo);
}
#ifdef CONFIG_IA32_EMULATION
/*
* Another set for IA32/LFS -- x86_64 struct stat is different due to
* support for 64bit inode numbers.
*/
static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat)
{
typeof(ubuf->st_uid) uid = 0;
typeof(ubuf->st_gid) gid = 0;
SET_UID(uid, from_kuid_munged(current_user_ns(), stat->uid));
SET_GID(gid, from_kgid_munged(current_user_ns(), stat->gid));
if (!access_ok(ubuf, sizeof(struct stat64)) ||
__put_user(huge_encode_dev(stat->dev), &ubuf->st_dev) ||
__put_user(stat->ino, &ubuf->__st_ino) ||
__put_user(stat->ino, &ubuf->st_ino) ||
__put_user(stat->mode, &ubuf->st_mode) ||
__put_user(stat->nlink, &ubuf->st_nlink) ||
__put_user(uid, &ubuf->st_uid) ||
__put_user(gid, &ubuf->st_gid) ||
__put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev) ||
__put_user(stat->size, &ubuf->st_size) ||
__put_user(stat->atime.tv_sec, &ubuf->st_atime) ||
__put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec) ||
__put_user(stat->mtime.tv_sec, &ubuf->st_mtime) ||
__put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec) ||
__put_user(stat->ctime.tv_sec, &ubuf->st_ctime) ||
__put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec) ||
__put_user(stat->blksize, &ubuf->st_blksize) ||
__put_user(stat->blocks, &ubuf->st_blocks))
return -EFAULT;
return 0;
}
COMPAT_SYSCALL_DEFINE2(ia32_stat64, const char __user *, filename,
struct stat64 __user *, statbuf)
{
struct kstat stat;
int ret = vfs_stat(filename, &stat);
if (!ret)
ret = cp_stat64(statbuf, &stat);
return ret;
}
COMPAT_SYSCALL_DEFINE2(ia32_lstat64, const char __user *, filename,
struct stat64 __user *, statbuf)
{
struct kstat stat;
int ret = vfs_lstat(filename, &stat);
if (!ret)
ret = cp_stat64(statbuf, &stat);
return ret;
}
COMPAT_SYSCALL_DEFINE2(ia32_fstat64, unsigned int, fd,
struct stat64 __user *, statbuf)
{
struct kstat stat;
int ret = vfs_fstat(fd, &stat);
if (!ret)
ret = cp_stat64(statbuf, &stat);
return ret;
}
COMPAT_SYSCALL_DEFINE4(ia32_fstatat64, unsigned int, dfd,
const char __user *, filename,
struct stat64 __user *, statbuf, int, flag)
{
struct kstat stat;
int error;
error = vfs_fstatat(dfd, filename, &stat, flag);
if (error)
return error;
return cp_stat64(statbuf, &stat);
}
/*
* Linux/i386 didn't use to be able to handle more than
* 4 system call parameters, so these system calls used a memory
* block for parameter passing..
*/
struct mmap_arg_struct32 {
unsigned int addr;
unsigned int len;
unsigned int prot;
unsigned int flags;
unsigned int fd;
unsigned int offset;
};
COMPAT_SYSCALL_DEFINE1(ia32_mmap, struct mmap_arg_struct32 __user *, arg)
{
struct mmap_arg_struct32 a;
if (copy_from_user(&a, arg, sizeof(a)))
return -EFAULT;
if (a.offset & ~PAGE_MASK)
return -EINVAL;
return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
a.offset>>PAGE_SHIFT);
}
/*
* The 32-bit clone ABI is CONFIG_CLONE_BACKWARDS
*/
COMPAT_SYSCALL_DEFINE5(ia32_clone, unsigned long, clone_flags,
unsigned long, newsp, int __user *, parent_tidptr,
unsigned long, tls_val, int __user *, child_tidptr)
{
struct kernel_clone_args args = {
.flags = (clone_flags & ~CSIGNAL),
.pidfd = parent_tidptr,
.child_tid = child_tidptr,
.parent_tid = parent_tidptr,
.exit_signal = (clone_flags & CSIGNAL),
.stack = newsp,
.tls = tls_val,
};
if (!legacy_clone_args_valid(&args))
return -EINVAL;
return _do_fork(&args);
}
#endif /* CONFIG_IA32_EMULATION */
|
