1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * S390 version
4 * Copyright IBM Corp. 2000
5 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
6 * Gerhard Tonn (ton@de.ibm.com)
7 * Thomas Spatzier (tspat@de.ibm.com)
8 *
9 * Conversion between 31bit and 64bit native syscalls.
10 *
11 * Heavily inspired by the 32-bit Sparc compat code which is
12 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
13 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
14 *
15 */
16
17
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
20 #include <linux/fs.h>
21 #include <linux/mm.h>
22 #include <linux/file.h>
23 #include <linux/signal.h>
24 #include <linux/resource.h>
25 #include <linux/times.h>
26 #include <linux/smp.h>
27 #include <linux/sem.h>
28 #include <linux/msg.h>
29 #include <linux/shm.h>
30 #include <linux/uio.h>
31 #include <linux/quota.h>
32 #include <linux/poll.h>
33 #include <linux/personality.h>
34 #include <linux/stat.h>
35 #include <linux/filter.h>
36 #include <linux/highmem.h>
37 #include <linux/mman.h>
38 #include <linux/ipv6.h>
39 #include <linux/in.h>
40 #include <linux/icmpv6.h>
41 #include <linux/syscalls.h>
42 #include <linux/sysctl.h>
43 #include <linux/binfmts.h>
44 #include <linux/capability.h>
45 #include <linux/compat.h>
46 #include <linux/vfs.h>
47 #include <linux/ptrace.h>
48 #include <linux/fadvise.h>
49 #include <linux/ipc.h>
50 #include <linux/slab.h>
51
52 #include <asm/types.h>
53 #include <linux/uaccess.h>
54
55 #include <net/scm.h>
56 #include <net/sock.h>
57
58 #include "compat_linux.h"
59
60 #ifdef CONFIG_SYSVIPC
COMPAT_SYSCALL_DEFINE5(s390_ipc,uint,call,int,first,compat_ulong_t,second,compat_ulong_t,third,compat_uptr_t,ptr)61 COMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, compat_ulong_t, second,
62 compat_ulong_t, third, compat_uptr_t, ptr)
63 {
64 if (call >> 16) /* hack for backward compatibility */
65 return -EINVAL;
66 return compat_ksys_ipc(call, first, second, third, ptr, third);
67 }
68 #endif
69
COMPAT_SYSCALL_DEFINE3(s390_truncate64,const char __user *,path,u32,high,u32,low)70 COMPAT_SYSCALL_DEFINE3(s390_truncate64, const char __user *, path, u32, high, u32, low)
71 {
72 return ksys_truncate(path, (unsigned long)high << 32 | low);
73 }
74
COMPAT_SYSCALL_DEFINE3(s390_ftruncate64,unsigned int,fd,u32,high,u32,low)75 COMPAT_SYSCALL_DEFINE3(s390_ftruncate64, unsigned int, fd, u32, high, u32, low)
76 {
77 return ksys_ftruncate(fd, (unsigned long)high << 32 | low);
78 }
79
COMPAT_SYSCALL_DEFINE5(s390_pread64,unsigned int,fd,char __user *,ubuf,compat_size_t,count,u32,high,u32,low)80 COMPAT_SYSCALL_DEFINE5(s390_pread64, unsigned int, fd, char __user *, ubuf,
81 compat_size_t, count, u32, high, u32, low)
82 {
83 if ((compat_ssize_t) count < 0)
84 return -EINVAL;
85 return ksys_pread64(fd, ubuf, count, (unsigned long)high << 32 | low);
86 }
87
COMPAT_SYSCALL_DEFINE5(s390_pwrite64,unsigned int,fd,const char __user *,ubuf,compat_size_t,count,u32,high,u32,low)88 COMPAT_SYSCALL_DEFINE5(s390_pwrite64, unsigned int, fd, const char __user *, ubuf,
89 compat_size_t, count, u32, high, u32, low)
90 {
91 if ((compat_ssize_t) count < 0)
92 return -EINVAL;
93 return ksys_pwrite64(fd, ubuf, count, (unsigned long)high << 32 | low);
94 }
95
COMPAT_SYSCALL_DEFINE4(s390_readahead,int,fd,u32,high,u32,low,s32,count)96 COMPAT_SYSCALL_DEFINE4(s390_readahead, int, fd, u32, high, u32, low, s32, count)
97 {
98 return ksys_readahead(fd, (unsigned long)high << 32 | low, count);
99 }
100
101 struct stat64_emu31 {
102 unsigned long long st_dev;
103 unsigned int __pad1;
104 #define STAT64_HAS_BROKEN_ST_INO 1
105 u32 __st_ino;
106 unsigned int st_mode;
107 unsigned int st_nlink;
108 u32 st_uid;
109 u32 st_gid;
110 unsigned long long st_rdev;
111 unsigned int __pad3;
112 long st_size;
113 u32 st_blksize;
114 unsigned char __pad4[4];
115 u32 __pad5; /* future possible st_blocks high bits */
116 u32 st_blocks; /* Number 512-byte blocks allocated. */
117 u32 st_atime;
118 u32 __pad6;
119 u32 st_mtime;
120 u32 __pad7;
121 u32 st_ctime;
122 u32 __pad8; /* will be high 32 bits of ctime someday */
123 unsigned long st_ino;
124 };
125
cp_stat64(struct stat64_emu31 __user * ubuf,struct kstat * stat)126 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
127 {
128 struct stat64_emu31 tmp;
129
130 memset(&tmp, 0, sizeof(tmp));
131
132 tmp.st_dev = huge_encode_dev(stat->dev);
133 tmp.st_ino = stat->ino;
134 tmp.__st_ino = (u32)stat->ino;
135 tmp.st_mode = stat->mode;
136 tmp.st_nlink = (unsigned int)stat->nlink;
137 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
138 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
139 tmp.st_rdev = huge_encode_dev(stat->rdev);
140 tmp.st_size = stat->size;
141 tmp.st_blksize = (u32)stat->blksize;
142 tmp.st_blocks = (u32)stat->blocks;
143 tmp.st_atime = (u32)stat->atime.tv_sec;
144 tmp.st_mtime = (u32)stat->mtime.tv_sec;
145 tmp.st_ctime = (u32)stat->ctime.tv_sec;
146
147 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
148 }
149
COMPAT_SYSCALL_DEFINE2(s390_stat64,const char __user *,filename,struct stat64_emu31 __user *,statbuf)150 COMPAT_SYSCALL_DEFINE2(s390_stat64, const char __user *, filename, struct stat64_emu31 __user *, statbuf)
151 {
152 struct kstat stat;
153 int ret = vfs_stat(filename, &stat);
154 if (!ret)
155 ret = cp_stat64(statbuf, &stat);
156 return ret;
157 }
158
COMPAT_SYSCALL_DEFINE2(s390_lstat64,const char __user *,filename,struct stat64_emu31 __user *,statbuf)159 COMPAT_SYSCALL_DEFINE2(s390_lstat64, const char __user *, filename, struct stat64_emu31 __user *, statbuf)
160 {
161 struct kstat stat;
162 int ret = vfs_lstat(filename, &stat);
163 if (!ret)
164 ret = cp_stat64(statbuf, &stat);
165 return ret;
166 }
167
COMPAT_SYSCALL_DEFINE2(s390_fstat64,unsigned int,fd,struct stat64_emu31 __user *,statbuf)168 COMPAT_SYSCALL_DEFINE2(s390_fstat64, unsigned int, fd, struct stat64_emu31 __user *, statbuf)
169 {
170 struct kstat stat;
171 int ret = vfs_fstat(fd, &stat);
172 if (!ret)
173 ret = cp_stat64(statbuf, &stat);
174 return ret;
175 }
176
COMPAT_SYSCALL_DEFINE4(s390_fstatat64,unsigned int,dfd,const char __user *,filename,struct stat64_emu31 __user *,statbuf,int,flag)177 COMPAT_SYSCALL_DEFINE4(s390_fstatat64, unsigned int, dfd, const char __user *, filename,
178 struct stat64_emu31 __user *, statbuf, int, flag)
179 {
180 struct kstat stat;
181 int error;
182
183 error = vfs_fstatat(dfd, filename, &stat, flag);
184 if (error)
185 return error;
186 return cp_stat64(statbuf, &stat);
187 }
188
189 /*
190 * Linux/i386 didn't use to be able to handle more than
191 * 4 system call parameters, so these system calls used a memory
192 * block for parameter passing..
193 */
194
195 struct mmap_arg_struct_emu31 {
196 compat_ulong_t addr;
197 compat_ulong_t len;
198 compat_ulong_t prot;
199 compat_ulong_t flags;
200 compat_ulong_t fd;
201 compat_ulong_t offset;
202 };
203
COMPAT_SYSCALL_DEFINE1(s390_old_mmap,struct mmap_arg_struct_emu31 __user *,arg)204 COMPAT_SYSCALL_DEFINE1(s390_old_mmap, struct mmap_arg_struct_emu31 __user *, arg)
205 {
206 struct mmap_arg_struct_emu31 a;
207
208 if (copy_from_user(&a, arg, sizeof(a)))
209 return -EFAULT;
210 if (a.offset & ~PAGE_MASK)
211 return -EINVAL;
212 return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
213 a.offset >> PAGE_SHIFT);
214 }
215
COMPAT_SYSCALL_DEFINE1(s390_mmap2,struct mmap_arg_struct_emu31 __user *,arg)216 COMPAT_SYSCALL_DEFINE1(s390_mmap2, struct mmap_arg_struct_emu31 __user *, arg)
217 {
218 struct mmap_arg_struct_emu31 a;
219
220 if (copy_from_user(&a, arg, sizeof(a)))
221 return -EFAULT;
222 return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
223 }
224
COMPAT_SYSCALL_DEFINE3(s390_read,unsigned int,fd,char __user *,buf,compat_size_t,count)225 COMPAT_SYSCALL_DEFINE3(s390_read, unsigned int, fd, char __user *, buf, compat_size_t, count)
226 {
227 if ((compat_ssize_t) count < 0)
228 return -EINVAL;
229
230 return ksys_read(fd, buf, count);
231 }
232
COMPAT_SYSCALL_DEFINE3(s390_write,unsigned int,fd,const char __user *,buf,compat_size_t,count)233 COMPAT_SYSCALL_DEFINE3(s390_write, unsigned int, fd, const char __user *, buf, compat_size_t, count)
234 {
235 if ((compat_ssize_t) count < 0)
236 return -EINVAL;
237
238 return ksys_write(fd, buf, count);
239 }
240
241 /*
242 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
243 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
244 * because the 31 bit values differ from the 64 bit values.
245 */
246
COMPAT_SYSCALL_DEFINE5(s390_fadvise64,int,fd,u32,high,u32,low,compat_size_t,len,int,advise)247 COMPAT_SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, high, u32, low, compat_size_t, len, int, advise)
248 {
249 if (advise == 4)
250 advise = POSIX_FADV_DONTNEED;
251 else if (advise == 5)
252 advise = POSIX_FADV_NOREUSE;
253 return ksys_fadvise64_64(fd, (unsigned long)high << 32 | low, len,
254 advise);
255 }
256
257 struct fadvise64_64_args {
258 int fd;
259 long long offset;
260 long long len;
261 int advice;
262 };
263
COMPAT_SYSCALL_DEFINE1(s390_fadvise64_64,struct fadvise64_64_args __user *,args)264 COMPAT_SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args)
265 {
266 struct fadvise64_64_args a;
267
268 if ( copy_from_user(&a, args, sizeof(a)) )
269 return -EFAULT;
270 if (a.advice == 4)
271 a.advice = POSIX_FADV_DONTNEED;
272 else if (a.advice == 5)
273 a.advice = POSIX_FADV_NOREUSE;
274 return ksys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
275 }
276
COMPAT_SYSCALL_DEFINE6(s390_sync_file_range,int,fd,u32,offhigh,u32,offlow,u32,nhigh,u32,nlow,unsigned int,flags)277 COMPAT_SYSCALL_DEFINE6(s390_sync_file_range, int, fd, u32, offhigh, u32, offlow,
278 u32, nhigh, u32, nlow, unsigned int, flags)
279 {
280 return ksys_sync_file_range(fd, ((loff_t)offhigh << 32) + offlow,
281 ((u64)nhigh << 32) + nlow, flags);
282 }
283
COMPAT_SYSCALL_DEFINE6(s390_fallocate,int,fd,int,mode,u32,offhigh,u32,offlow,u32,lenhigh,u32,lenlow)284 COMPAT_SYSCALL_DEFINE6(s390_fallocate, int, fd, int, mode, u32, offhigh, u32, offlow,
285 u32, lenhigh, u32, lenlow)
286 {
287 return ksys_fallocate(fd, mode, ((loff_t)offhigh << 32) + offlow,
288 ((u64)lenhigh << 32) + lenlow);
289 }
290