xref: /openbmc/linux/arch/s390/kernel/compat_linux.c (revision 597473720f4dc69749542bfcfed4a927a43d935e)
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