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 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 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 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 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 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 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 }; 125 126 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 } 149 150 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 } 158 159 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 } 167 168 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 } 176 177 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 }; 203 204 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 } 215 216 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 } 224 225 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 } 232 233 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 */ 246 247 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 }; 263 264 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 } 276 277 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 } 283 284 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