1// SPDX-License-Identifier: GPL-2.0
2/*
3 * sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Based on
4 * sys_sparc32
5 *
6 * Copyright (C) 2000 VA Linux Co
7 * Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
8 * Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
9 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
10 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
11 * Copyright (C) 2000 Hewlett-Packard Co.
12 * Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
13 * Copyright (C) 2000,2001,2002 Andi Kleen, SuSE Labs (x86-64 port)
14 *
15 * These routines maintain argument size conversion between 32bit and 64bit
16 * environment. In 2.5 most of this should be moved to a generic directory.
17 *
18 * This file assumes that there is a hole at the end of user address space.
19 *
20 * Some of the functions are LE specific currently. These are
21 * hopefully all marked. This should be fixed.
22 */
23
24#include <linux/kernel.h>
25#include <linux/sched.h>
26#include <linux/fs.h>
27#include <linux/file.h>
28#include <linux/signal.h>
29#include <linux/syscalls.h>
30#include <linux/times.h>
31#include <linux/utsname.h>
32#include <linux/mm.h>
33#include <linux/uio.h>
34#include <linux/poll.h>
35#include <linux/personality.h>
36#include <linux/stat.h>
37#include <linux/rwsem.h>
38#include <linux/compat.h>
39#include <linux/vfs.h>
40#include <linux/ptrace.h>
41#include <linux/highuid.h>
42#include <linux/sysctl.h>
43#include <linux/slab.h>
44#include <linux/sched/task.h>
45#include <asm/mman.h>
46#include <asm/types.h>
47#include <linux/uaccess.h>
48#include <linux/atomic.h>
49#include <asm/vgtod.h>
50#include <asm/ia32.h>
51
52#define AA(__x) ((unsigned long)(__x))
53
54
55COMPAT_SYSCALL_DEFINE3(x86_truncate64, const char __user *, filename,
56 unsigned long, offset_low, unsigned long, offset_high)
57{
58 return ksys_truncate(filename,
59 ((loff_t) offset_high << 32) | offset_low);
60}
61
62COMPAT_SYSCALL_DEFINE3(x86_ftruncate64, unsigned int, fd,
63 unsigned long, offset_low, unsigned long, offset_high)
64{
65 return ksys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low);
66}
67
68/*
69 * Another set for IA32/LFS -- x86_64 struct stat is different due to
70 * support for 64bit inode numbers.
71 */
72static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat)
73{
74 typeof(ubuf->st_uid) uid = 0;
75 typeof(ubuf->st_gid) gid = 0;
76 SET_UID(uid, from_kuid_munged(current_user_ns(), stat->uid));
77 SET_GID(gid, from_kgid_munged(current_user_ns(), stat->gid));
78 if (!access_ok(ubuf, sizeof(struct stat64)) ||
79 __put_user(huge_encode_dev(stat->dev), &ubuf->st_dev) ||
80 __put_user(stat->ino, &ubuf->__st_ino) ||
81 __put_user(stat->ino, &ubuf->st_ino) ||
82 __put_user(stat->mode, &ubuf->st_mode) ||
83 __put_user(stat->nlink, &ubuf->st_nlink) ||
84 __put_user(uid, &ubuf->st_uid) ||
85 __put_user(gid, &ubuf->st_gid) ||
86 __put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev) ||
87 __put_user(stat->size, &ubuf->st_size) ||
88 __put_user(stat->atime.tv_sec, &ubuf->st_atime) ||
89 __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec) ||
90 __put_user(stat->mtime.tv_sec, &ubuf->st_mtime) ||
91 __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec) ||
92 __put_user(stat->ctime.tv_sec, &ubuf->st_ctime) ||
93 __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec) ||
94 __put_user(stat->blksize, &ubuf->st_blksize) ||
95 __put_user(stat->blocks, &ubuf->st_blocks))
96 return -EFAULT;
97 return 0;
98}
99
100COMPAT_SYSCALL_DEFINE2(x86_stat64, const char __user *, filename,
101 struct stat64 __user *, statbuf)
102{
103 struct kstat stat;
104 int ret = vfs_stat(filename, &stat);
105
106 if (!ret)
107 ret = cp_stat64(statbuf, &stat);
108 return ret;
109}
110
111COMPAT_SYSCALL_DEFINE2(x86_lstat64, const char __user *, filename,
112 struct stat64 __user *, statbuf)
113{
114 struct kstat stat;
115 int ret = vfs_lstat(filename, &stat);
116 if (!ret)
117 ret = cp_stat64(statbuf, &stat);
118 return ret;
119}
120
121COMPAT_SYSCALL_DEFINE2(x86_fstat64, unsigned int, fd,
122 struct stat64 __user *, statbuf)
123{
124 struct kstat stat;
125 int ret = vfs_fstat(fd, &stat);
126 if (!ret)
127 ret = cp_stat64(statbuf, &stat);
128 return ret;
129}
130
131COMPAT_SYSCALL_DEFINE4(x86_fstatat, unsigned int, dfd,
132 const char __user *, filename,
133 struct stat64 __user *, statbuf, int, flag)
134{
135 struct kstat stat;
136 int error;
137
138 error = vfs_fstatat(dfd, filename, &stat, flag);
139 if (error)
140 return error;
141 return cp_stat64(statbuf, &stat);
142}
143
144/*
145 * Linux/i386 didn't use to be able to handle more than
146 * 4 system call parameters, so these system calls used a memory
147 * block for parameter passing..
148 */
149
150struct mmap_arg_struct32 {
151 unsigned int addr;
152 unsigned int len;
153 unsigned int prot;
154 unsigned int flags;
155 unsigned int fd;
156 unsigned int offset;
157};
158
159COMPAT_SYSCALL_DEFINE1(x86_mmap, struct mmap_arg_struct32 __user *, arg)
160{
161 struct mmap_arg_struct32 a;
162
163 if (copy_from_user(&a, arg, sizeof(a)))
164 return -EFAULT;
165
166 if (a.offset & ~PAGE_MASK)
167 return -EINVAL;
168
169 return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
170 a.offset>>PAGE_SHIFT);
171}
172
173/* warning: next two assume little endian */
174COMPAT_SYSCALL_DEFINE5(x86_pread, unsigned int, fd, char __user *, ubuf,
175 u32, count, u32, poslo, u32, poshi)
176{
177 return ksys_pread64(fd, ubuf, count,
178 ((loff_t)AA(poshi) << 32) | AA(poslo));
179}
180
181COMPAT_SYSCALL_DEFINE5(x86_pwrite, unsigned int, fd, const char __user *, ubuf,
182 u32, count, u32, poslo, u32, poshi)
183{
184 return ksys_pwrite64(fd, ubuf, count,
185 ((loff_t)AA(poshi) << 32) | AA(poslo));
186}
187
188
189/*
190 * Some system calls that need sign extended arguments. This could be
191 * done by a generic wrapper.
192 */
193COMPAT_SYSCALL_DEFINE6(x86_fadvise64_64, int, fd, __u32, offset_low,
194 __u32, offset_high, __u32, len_low, __u32, len_high,
195 int, advice)
196{
197 return ksys_fadvise64_64(fd,
198 (((u64)offset_high)<<32) | offset_low,
199 (((u64)len_high)<<32) | len_low,
200 advice);
201}
202
203COMPAT_SYSCALL_DEFINE4(x86_readahead, int, fd, unsigned int, off_lo,
204 unsigned int, off_hi, size_t, count)
205{
206 return ksys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
207}
208
209COMPAT_SYSCALL_DEFINE6(x86_sync_file_range, int, fd, unsigned int, off_low,
210 unsigned int, off_hi, unsigned int, n_low,
211 unsigned int, n_hi, int, flags)
212{
213 return ksys_sync_file_range(fd,
214 ((u64)off_hi << 32) | off_low,
215 ((u64)n_hi << 32) | n_low, flags);
216}
217
218COMPAT_SYSCALL_DEFINE5(x86_fadvise64, int, fd, unsigned int, offset_lo,
219 unsigned int, offset_hi, size_t, len, int, advice)
220{
221 return ksys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
222 len, advice);
223}
224
225COMPAT_SYSCALL_DEFINE6(x86_fallocate, int, fd, int, mode,
226 unsigned int, offset_lo, unsigned int, offset_hi,
227 unsigned int, len_lo, unsigned int, len_hi)
228{
229 return ksys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
230 ((u64)len_hi << 32) | len_lo);
231}
232
233/*
234 * The 32-bit clone ABI is CONFIG_CLONE_BACKWARDS
235 */
236COMPAT_SYSCALL_DEFINE5(x86_clone, unsigned long, clone_flags,
237 unsigned long, newsp, int __user *, parent_tidptr,
238 unsigned long, tls_val, int __user *, child_tidptr)
239{
240 return _do_fork(clone_flags, newsp, 0, parent_tidptr, child_tidptr,
241 tls_val);
242}
243