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