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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 <[email protected]>
8 * Copyright (C) 1999 Arun Sharma <[email protected]>
9 * Copyright (C) 1997,1998 Jakub Jelinek ([email protected])
10 * Copyright (C) 1997 David S. Miller ([email protected])
11 * Copyright (C) 2000 Hewlett-Packard Co.
12 * Copyright (C) 2000 David Mosberger-Tang <[email protected]>
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
54SYSCALL_DEFINE3(ia32_truncate64, const char __user *, filename,
55 unsigned long, offset_low, unsigned long, offset_high)
56{
57 return ksys_truncate(filename,
58 ((loff_t) offset_high << 32) | offset_low);
59}
60
61SYSCALL_DEFINE3(ia32_ftruncate64, unsigned int, fd,
62 unsigned long, offset_low, unsigned long, offset_high)
63{
64 return ksys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low,
65 FTRUNCATE_LFS);
66}
67
68/* warning: next two assume little endian */
69SYSCALL_DEFINE5(ia32_pread64, unsigned int, fd, char __user *, ubuf,
70 u32, count, u32, poslo, u32, poshi)
71{
72 return ksys_pread64(fd, ubuf, count,
73 ((loff_t)AA(poshi) << 32) | AA(poslo));
74}
75
76SYSCALL_DEFINE5(ia32_pwrite64, unsigned int, fd, const char __user *, ubuf,
77 u32, count, u32, poslo, u32, poshi)
78{
79 return ksys_pwrite64(fd, ubuf, count,
80 ((loff_t)AA(poshi) << 32) | AA(poslo));
81}
82
83
84/*
85 * Some system calls that need sign extended arguments. This could be
86 * done by a generic wrapper.
87 */
88SYSCALL_DEFINE6(ia32_fadvise64_64, int, fd, __u32, offset_low,
89 __u32, offset_high, __u32, len_low, __u32, len_high,
90 int, advice)
91{
92 return ksys_fadvise64_64(fd,
93 (((u64)offset_high)<<32) | offset_low,
94 (((u64)len_high)<<32) | len_low,
95 advice);
96}
97
98SYSCALL_DEFINE4(ia32_readahead, int, fd, unsigned int, off_lo,
99 unsigned int, off_hi, size_t, count)
100{
101 return ksys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
102}
103
104SYSCALL_DEFINE6(ia32_sync_file_range, int, fd, unsigned int, off_low,
105 unsigned int, off_hi, unsigned int, n_low,
106 unsigned int, n_hi, int, flags)
107{
108 return ksys_sync_file_range(fd,
109 ((u64)off_hi << 32) | off_low,
110 ((u64)n_hi << 32) | n_low, flags);
111}
112
113SYSCALL_DEFINE5(ia32_fadvise64, int, fd, unsigned int, offset_lo,
114 unsigned int, offset_hi, size_t, len, int, advice)
115{
116 return ksys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
117 len, advice);
118}
119
120SYSCALL_DEFINE6(ia32_fallocate, int, fd, int, mode,
121 unsigned int, offset_lo, unsigned int, offset_hi,
122 unsigned int, len_lo, unsigned int, len_hi)
123{
124 return ksys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
125 ((u64)len_hi << 32) | len_lo);
126}
127
128#ifdef CONFIG_IA32_EMULATION
129/*
130 * Another set for IA32/LFS -- x86_64 struct stat is different due to
131 * support for 64bit inode numbers.
132 */
133static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat)
134{
135 typeof(ubuf->st_uid) uid = 0;
136 typeof(ubuf->st_gid) gid = 0;
137 SET_UID(uid, from_kuid_munged(current_user_ns(), stat->uid));
138 SET_GID(gid, from_kgid_munged(current_user_ns(), stat->gid));
139 if (!user_write_access_begin(ubuf, sizeof(struct stat64)))
140 return -EFAULT;
141 unsafe_put_user(huge_encode_dev(stat->dev), &ubuf->st_dev, Efault);
142 unsafe_put_user(stat->ino, &ubuf->__st_ino, Efault);
143 unsafe_put_user(stat->ino, &ubuf->st_ino, Efault);
144 unsafe_put_user(stat->mode, &ubuf->st_mode, Efault);
145 unsafe_put_user(stat->nlink, &ubuf->st_nlink, Efault);
146 unsafe_put_user(uid, &ubuf->st_uid, Efault);
147 unsafe_put_user(gid, &ubuf->st_gid, Efault);
148 unsafe_put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev, Efault);
149 unsafe_put_user(stat->size, &ubuf->st_size, Efault);
150 unsafe_put_user(stat->atime.tv_sec, &ubuf->st_atime, Efault);
151 unsafe_put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec, Efault);
152 unsafe_put_user(stat->mtime.tv_sec, &ubuf->st_mtime, Efault);
153 unsafe_put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec, Efault);
154 unsafe_put_user(stat->ctime.tv_sec, &ubuf->st_ctime, Efault);
155 unsafe_put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec, Efault);
156 unsafe_put_user(stat->blksize, &ubuf->st_blksize, Efault);
157 unsafe_put_user(stat->blocks, &ubuf->st_blocks, Efault);
158 user_access_end();
159 return 0;
160Efault:
161 user_write_access_end();
162 return -EFAULT;
163}
164
165COMPAT_SYSCALL_DEFINE2(ia32_stat64, const char __user *, filename,
166 struct stat64 __user *, statbuf)
167{
168 struct kstat stat;
169 int ret = vfs_stat(filename, &stat);
170
171 if (!ret)
172 ret = cp_stat64(statbuf, &stat);
173 return ret;
174}
175
176COMPAT_SYSCALL_DEFINE2(ia32_lstat64, const char __user *, filename,
177 struct stat64 __user *, statbuf)
178{
179 struct kstat stat;
180 int ret = vfs_lstat(filename, &stat);
181 if (!ret)
182 ret = cp_stat64(statbuf, &stat);
183 return ret;
184}
185
186COMPAT_SYSCALL_DEFINE2(ia32_fstat64, unsigned int, fd,
187 struct stat64 __user *, statbuf)
188{
189 struct kstat stat;
190 int ret = vfs_fstat(fd, &stat);
191 if (!ret)
192 ret = cp_stat64(statbuf, &stat);
193 return ret;
194}
195
196COMPAT_SYSCALL_DEFINE4(ia32_fstatat64, unsigned int, dfd,
197 const char __user *, filename,
198 struct stat64 __user *, statbuf, int, flag)
199{
200 struct kstat stat;
201 int error;
202
203 error = vfs_fstatat(dfd, filename, &stat, flag);
204 if (error)
205 return error;
206 return cp_stat64(statbuf, &stat);
207}
208
209/*
210 * Linux/i386 didn't use to be able to handle more than
211 * 4 system call parameters, so these system calls used a memory
212 * block for parameter passing..
213 */
214
215struct mmap_arg_struct32 {
216 unsigned int addr;
217 unsigned int len;
218 unsigned int prot;
219 unsigned int flags;
220 unsigned int fd;
221 unsigned int offset;
222};
223
224COMPAT_SYSCALL_DEFINE1(ia32_mmap, struct mmap_arg_struct32 __user *, arg)
225{
226 struct mmap_arg_struct32 a;
227
228 if (copy_from_user(&a, arg, sizeof(a)))
229 return -EFAULT;
230
231 if (a.offset & ~PAGE_MASK)
232 return -EINVAL;
233
234 return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
235 a.offset>>PAGE_SHIFT);
236}
237
238/*
239 * The 32-bit clone ABI is CONFIG_CLONE_BACKWARDS
240 */
241COMPAT_SYSCALL_DEFINE5(ia32_clone, unsigned long, clone_flags,
242 unsigned long, newsp, int __user *, parent_tidptr,
243 unsigned long, tls_val, int __user *, child_tidptr)
244{
245 struct kernel_clone_args args = {
246 .flags = (clone_flags & ~CSIGNAL),
247 .pidfd = parent_tidptr,
248 .child_tid = child_tidptr,
249 .parent_tid = parent_tidptr,
250 .exit_signal = (clone_flags & CSIGNAL),
251 .stack = newsp,
252 .tls = tls_val,
253 };
254
255 return kernel_clone(&args);
256}
257#endif /* CONFIG_IA32_EMULATION */