s390/kernel/compat_linux.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /*
0003  *  S390 version
0004  *    Copyright IBM Corp. 2000
0005  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
0006  *               Gerhard Tonn (ton@de.ibm.com)
0007  *               Thomas Spatzier (tspat@de.ibm.com)
0008  *
0009  *  Conversion between 31bit and 64bit native syscalls.
0010  *
0011  * Heavily inspired by the 32-bit Sparc compat code which is
0012  * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
0013  * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
0014  *
0015  */
0016
0017
0018 #include <linux/kernel.h>
0019 #include <linux/sched.h>
0020 #include <linux/fs.h>
0021 #include <linux/mm.h>
0022 #include <linux/file.h>
0023 #include <linux/signal.h>
0024 #include <linux/resource.h>
0025 #include <linux/times.h>
0026 #include <linux/smp.h>
0027 #include <linux/sem.h>
0028 #include <linux/msg.h>
0029 #include <linux/shm.h>
0030 #include <linux/uio.h>
0031 #include <linux/quota.h>
0032 #include <linux/poll.h>
0033 #include <linux/personality.h>
0034 #include <linux/stat.h>
0035 #include <linux/filter.h>
0036 #include <linux/highmem.h>
0037 #include <linux/mman.h>
0038 #include <linux/ipv6.h>
0039 #include <linux/in.h>
0040 #include <linux/icmpv6.h>
0041 #include <linux/syscalls.h>
0042 #include <linux/sysctl.h>
0043 #include <linux/binfmts.h>
0044 #include <linux/capability.h>
0045 #include <linux/compat.h>
0046 #include <linux/vfs.h>
0047 #include <linux/ptrace.h>
0048 #include <linux/fadvise.h>
0049 #include <linux/ipc.h>
0050 #include <linux/slab.h>
0051
0052 #include <asm/types.h>
0053 #include <linux/uaccess.h>
0054
0055 #include <net/scm.h>
0056 #include <net/sock.h>
0057
0058 #include "compat_linux.h"
0059
0060 #ifdef CONFIG_SYSVIPC
0061 COMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, compat_ulong_t, second,
0062         compat_ulong_t, third, compat_uptr_t, ptr)
0063 {
0064     if (call >> 16)     /* hack for backward compatibility */
0065         return -EINVAL;
0066     return compat_ksys_ipc(call, first, second, third, ptr, third);
0067 }
0068 #endif
0069
0070 COMPAT_SYSCALL_DEFINE3(s390_truncate64, const char __user *, path, u32, high, u32, low)
0071 {
0072     return ksys_truncate(path, (unsigned long)high << 32 | low);
0073 }
0074
0075 COMPAT_SYSCALL_DEFINE3(s390_ftruncate64, unsigned int, fd, u32, high, u32, low)
0076 {
0077     return ksys_ftruncate(fd, (unsigned long)high << 32 | low);
0078 }
0079
0080 COMPAT_SYSCALL_DEFINE5(s390_pread64, unsigned int, fd, char __user *, ubuf,
0081                compat_size_t, count, u32, high, u32, low)
0082 {
0083     if ((compat_ssize_t) count < 0)
0084         return -EINVAL;
0085     return ksys_pread64(fd, ubuf, count, (unsigned long)high << 32 | low);
0086 }
0087
0088 COMPAT_SYSCALL_DEFINE5(s390_pwrite64, unsigned int, fd, const char __user *, ubuf,
0089                compat_size_t, count, u32, high, u32, low)
0090 {
0091     if ((compat_ssize_t) count < 0)
0092         return -EINVAL;
0093     return ksys_pwrite64(fd, ubuf, count, (unsigned long)high << 32 | low);
0094 }
0095
0096 COMPAT_SYSCALL_DEFINE4(s390_readahead, int, fd, u32, high, u32, low, s32, count)
0097 {
0098     return ksys_readahead(fd, (unsigned long)high << 32 | low, count);
0099 }
0100
0101 struct stat64_emu31 {
0102     unsigned long long  st_dev;
0103     unsigned int    __pad1;
0104 #define STAT64_HAS_BROKEN_ST_INO        1
0105     u32             __st_ino;
0106     unsigned int    st_mode;
0107     unsigned int    st_nlink;
0108     u32             st_uid;
0109     u32             st_gid;
0110     unsigned long long  st_rdev;
0111     unsigned int    __pad3;
0112     long            st_size;
0113     u32             st_blksize;
0114     unsigned char   __pad4[4];
0115     u32             __pad5;     /* future possible st_blocks high bits */
0116     u32             st_blocks;  /* Number 512-byte blocks allocated. */
0117     u32             st_atime;
0118     u32             __pad6;
0119     u32             st_mtime;
0120     u32             __pad7;
0121     u32             st_ctime;
0122     u32             __pad8;     /* will be high 32 bits of ctime someday */
0123     unsigned long   st_ino;
0124 };
0125
0126 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
0127 {
0128     struct stat64_emu31 tmp;
0129
0130     memset(&tmp, 0, sizeof(tmp));
0131
0132     tmp.st_dev = huge_encode_dev(stat->dev);
0133     tmp.st_ino = stat->ino;
0134     tmp.__st_ino = (u32)stat->ino;
0135     tmp.st_mode = stat->mode;
0136     tmp.st_nlink = (unsigned int)stat->nlink;
0137     tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
0138     tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
0139     tmp.st_rdev = huge_encode_dev(stat->rdev);
0140     tmp.st_size = stat->size;
0141     tmp.st_blksize = (u32)stat->blksize;
0142     tmp.st_blocks = (u32)stat->blocks;
0143     tmp.st_atime = (u32)stat->atime.tv_sec;
0144     tmp.st_mtime = (u32)stat->mtime.tv_sec;
0145     tmp.st_ctime = (u32)stat->ctime.tv_sec;
0146
0147     return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
0148 }
0149
0150 COMPAT_SYSCALL_DEFINE2(s390_stat64, const char __user *, filename, struct stat64_emu31 __user *, statbuf)
0151 {
0152     struct kstat stat;
0153     int ret = vfs_stat(filename, &stat);
0154     if (!ret)
0155         ret = cp_stat64(statbuf, &stat);
0156     return ret;
0157 }
0158
0159 COMPAT_SYSCALL_DEFINE2(s390_lstat64, const char __user *, filename, struct stat64_emu31 __user *, statbuf)
0160 {
0161     struct kstat stat;
0162     int ret = vfs_lstat(filename, &stat);
0163     if (!ret)
0164         ret = cp_stat64(statbuf, &stat);
0165     return ret;
0166 }
0167
0168 COMPAT_SYSCALL_DEFINE2(s390_fstat64, unsigned int, fd, struct stat64_emu31 __user *, statbuf)
0169 {
0170     struct kstat stat;
0171     int ret = vfs_fstat(fd, &stat);
0172     if (!ret)
0173         ret = cp_stat64(statbuf, &stat);
0174     return ret;
0175 }
0176
0177 COMPAT_SYSCALL_DEFINE4(s390_fstatat64, unsigned int, dfd, const char __user *, filename,
0178                struct stat64_emu31 __user *, statbuf, int, flag)
0179 {
0180     struct kstat stat;
0181     int error;
0182
0183     error = vfs_fstatat(dfd, filename, &stat, flag);
0184     if (error)
0185         return error;
0186     return cp_stat64(statbuf, &stat);
0187 }
0188
0189 /*
0190  * Linux/i386 didn't use to be able to handle more than
0191  * 4 system call parameters, so these system calls used a memory
0192  * block for parameter passing..
0193  */
0194
0195 struct mmap_arg_struct_emu31 {
0196     compat_ulong_t addr;
0197     compat_ulong_t len;
0198     compat_ulong_t prot;
0199     compat_ulong_t flags;
0200     compat_ulong_t fd;
0201     compat_ulong_t offset;
0202 };
0203
0204 COMPAT_SYSCALL_DEFINE1(s390_old_mmap, struct mmap_arg_struct_emu31 __user *, arg)
0205 {
0206     struct mmap_arg_struct_emu31 a;
0207
0208     if (copy_from_user(&a, arg, sizeof(a)))
0209         return -EFAULT;
0210     if (a.offset & ~PAGE_MASK)
0211         return -EINVAL;
0212     return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
0213                    a.offset >> PAGE_SHIFT);
0214 }
0215
0216 COMPAT_SYSCALL_DEFINE1(s390_mmap2, struct mmap_arg_struct_emu31 __user *, arg)
0217 {
0218     struct mmap_arg_struct_emu31 a;
0219
0220     if (copy_from_user(&a, arg, sizeof(a)))
0221         return -EFAULT;
0222     return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
0223 }
0224
0225 COMPAT_SYSCALL_DEFINE3(s390_read, unsigned int, fd, char __user *, buf, compat_size_t, count)
0226 {
0227     if ((compat_ssize_t) count < 0)
0228         return -EINVAL;
0229
0230     return ksys_read(fd, buf, count);
0231 }
0232
0233 COMPAT_SYSCALL_DEFINE3(s390_write, unsigned int, fd, const char __user *, buf, compat_size_t, count)
0234 {
0235     if ((compat_ssize_t) count < 0)
0236         return -EINVAL;
0237
0238     return ksys_write(fd, buf, count);
0239 }
0240
0241 /*
0242  * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
0243  * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
0244  * because the 31 bit values differ from the 64 bit values.
0245  */
0246
0247 COMPAT_SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, high, u32, low, compat_size_t, len, int, advise)
0248 {
0249     if (advise == 4)
0250         advise = POSIX_FADV_DONTNEED;
0251     else if (advise == 5)
0252         advise = POSIX_FADV_NOREUSE;
0253     return ksys_fadvise64_64(fd, (unsigned long)high << 32 | low, len,
0254                  advise);
0255 }
0256
0257 struct fadvise64_64_args {
0258     int fd;
0259     long long offset;
0260     long long len;
0261     int advice;
0262 };
0263
0264 COMPAT_SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args)
0265 {
0266     struct fadvise64_64_args a;
0267
0268     if ( copy_from_user(&a, args, sizeof(a)) )
0269         return -EFAULT;
0270     if (a.advice == 4)
0271         a.advice = POSIX_FADV_DONTNEED;
0272     else if (a.advice == 5)
0273         a.advice = POSIX_FADV_NOREUSE;
0274     return ksys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
0275 }
0276
0277 COMPAT_SYSCALL_DEFINE6(s390_sync_file_range, int, fd, u32, offhigh, u32, offlow,
0278                u32, nhigh, u32, nlow, unsigned int, flags)
0279 {
0280     return ksys_sync_file_range(fd, ((loff_t)offhigh << 32) + offlow,
0281                    ((u64)nhigh << 32) + nlow, flags);
0282 }
0283
0284 COMPAT_SYSCALL_DEFINE6(s390_fallocate, int, fd, int, mode, u32, offhigh, u32, offlow,
0285                u32, lenhigh, u32, lenlow)
0286 {
0287     return ksys_fallocate(fd, mode, ((loff_t)offhigh << 32) + offlow,
0288                   ((u64)lenhigh << 32) + lenlow);
0289 }