Line data Source code
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 0 : SYSCALL_DEFINE3(ia32_truncate64, const char __user *, filename,
55 : unsigned long, offset_low, unsigned long, offset_high)
56 : {
57 0 : return ksys_truncate(filename,
58 0 : ((loff_t) offset_high << 32) | offset_low);
59 : }
60 :
61 0 : SYSCALL_DEFINE3(ia32_ftruncate64, unsigned int, fd,
62 : unsigned long, offset_low, unsigned long, offset_high)
63 : {
64 0 : return ksys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low);
65 : }
66 :
67 : /* warning: next two assume little endian */
68 0 : SYSCALL_DEFINE5(ia32_pread64, unsigned int, fd, char __user *, ubuf,
69 : u32, count, u32, poslo, u32, poshi)
70 : {
71 0 : return ksys_pread64(fd, ubuf, count,
72 0 : ((loff_t)AA(poshi) << 32) | AA(poslo));
73 : }
74 :
75 0 : SYSCALL_DEFINE5(ia32_pwrite64, unsigned int, fd, const char __user *, ubuf,
76 : u32, count, u32, poslo, u32, poshi)
77 : {
78 0 : return ksys_pwrite64(fd, ubuf, count,
79 0 : ((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 0 : 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 0 : return ksys_fadvise64_64(fd,
92 0 : (((u64)offset_high)<<32) | offset_low,
93 0 : (((u64)len_high)<<32) | len_low,
94 : advice);
95 : }
96 :
97 0 : SYSCALL_DEFINE4(ia32_readahead, int, fd, unsigned int, off_lo,
98 : unsigned int, off_hi, size_t, count)
99 : {
100 0 : return ksys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
101 : }
102 :
103 0 : 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 0 : return ksys_sync_file_range(fd,
108 0 : ((u64)off_hi << 32) | off_low,
109 0 : ((u64)n_hi << 32) | n_low, flags);
110 : }
111 :
112 0 : SYSCALL_DEFINE5(ia32_fadvise64, int, fd, unsigned int, offset_lo,
113 : unsigned int, offset_hi, size_t, len, int, advice)
114 : {
115 0 : return ksys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
116 : len, advice);
117 : }
118 :
119 0 : 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 0 : return ksys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
124 0 : ((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 0 : static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat)
133 : {
134 0 : typeof(ubuf->st_uid) uid = 0;
135 0 : typeof(ubuf->st_gid) gid = 0;
136 0 : SET_UID(uid, from_kuid_munged(current_user_ns(), stat->uid));
137 0 : SET_GID(gid, from_kgid_munged(current_user_ns(), stat->gid));
138 0 : if (!user_write_access_begin(ubuf, sizeof(struct stat64)))
139 : return -EFAULT;
140 0 : unsafe_put_user(huge_encode_dev(stat->dev), &ubuf->st_dev, Efault);
141 0 : unsafe_put_user(stat->ino, &ubuf->__st_ino, Efault);
142 0 : unsafe_put_user(stat->ino, &ubuf->st_ino, Efault);
143 0 : unsafe_put_user(stat->mode, &ubuf->st_mode, Efault);
144 0 : unsafe_put_user(stat->nlink, &ubuf->st_nlink, Efault);
145 0 : unsafe_put_user(uid, &ubuf->st_uid, Efault);
146 0 : unsafe_put_user(gid, &ubuf->st_gid, Efault);
147 0 : unsafe_put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev, Efault);
148 0 : unsafe_put_user(stat->size, &ubuf->st_size, Efault);
149 0 : unsafe_put_user(stat->atime.tv_sec, &ubuf->st_atime, Efault);
150 0 : unsafe_put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec, Efault);
151 0 : unsafe_put_user(stat->mtime.tv_sec, &ubuf->st_mtime, Efault);
152 0 : unsafe_put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec, Efault);
153 0 : unsafe_put_user(stat->ctime.tv_sec, &ubuf->st_ctime, Efault);
154 0 : unsafe_put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec, Efault);
155 0 : unsafe_put_user(stat->blksize, &ubuf->st_blksize, Efault);
156 0 : unsafe_put_user(stat->blocks, &ubuf->st_blocks, Efault);
157 0 : user_access_end();
158 0 : return 0;
159 : Efault:
160 : user_write_access_end();
161 : return -EFAULT;
162 : }
163 :
164 0 : COMPAT_SYSCALL_DEFINE2(ia32_stat64, const char __user *, filename,
165 : struct stat64 __user *, statbuf)
166 : {
167 0 : struct kstat stat;
168 0 : int ret = vfs_stat(filename, &stat);
169 :
170 0 : if (!ret)
171 0 : ret = cp_stat64(statbuf, &stat);
172 0 : return ret;
173 : }
174 :
175 0 : COMPAT_SYSCALL_DEFINE2(ia32_lstat64, const char __user *, filename,
176 : struct stat64 __user *, statbuf)
177 : {
178 0 : struct kstat stat;
179 0 : int ret = vfs_lstat(filename, &stat);
180 0 : if (!ret)
181 0 : ret = cp_stat64(statbuf, &stat);
182 0 : return ret;
183 : }
184 :
185 0 : COMPAT_SYSCALL_DEFINE2(ia32_fstat64, unsigned int, fd,
186 : struct stat64 __user *, statbuf)
187 : {
188 0 : struct kstat stat;
189 0 : int ret = vfs_fstat(fd, &stat);
190 0 : if (!ret)
191 0 : ret = cp_stat64(statbuf, &stat);
192 0 : return ret;
193 : }
194 :
195 0 : COMPAT_SYSCALL_DEFINE4(ia32_fstatat64, unsigned int, dfd,
196 : const char __user *, filename,
197 : struct stat64 __user *, statbuf, int, flag)
198 : {
199 0 : struct kstat stat;
200 0 : int error;
201 :
202 0 : error = vfs_fstatat(dfd, filename, &stat, flag);
203 0 : if (error)
204 0 : return error;
205 0 : 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 0 : COMPAT_SYSCALL_DEFINE1(ia32_mmap, struct mmap_arg_struct32 __user *, arg)
224 : {
225 0 : struct mmap_arg_struct32 a;
226 :
227 0 : if (copy_from_user(&a, arg, sizeof(a)))
228 : return -EFAULT;
229 :
230 0 : if (a.offset & ~PAGE_MASK)
231 : return -EINVAL;
232 :
233 0 : return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
234 0 : a.offset>>PAGE_SHIFT);
235 : }
236 :
237 : /*
238 : * The 32-bit clone ABI is CONFIG_CLONE_BACKWARDS
239 : */
240 0 : 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 0 : struct kernel_clone_args args = {
245 0 : .flags = (clone_flags & ~CSIGNAL),
246 : .pidfd = parent_tidptr,
247 : .child_tid = child_tidptr,
248 : .parent_tid = parent_tidptr,
249 0 : .exit_signal = (clone_flags & CSIGNAL),
250 : .stack = newsp,
251 : .tls = tls_val,
252 : };
253 :
254 0 : return kernel_clone(&args);
255 : }
256 : #endif /* CONFIG_IA32_EMULATION */
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