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 SYSCALL_DEFINE3(ia32_truncate64, const char __user *, filename, 55 unsigned long, offset_low, unsigned long, offset_high) 56 { 57 return ksys_truncate(filename, 58 ((loff_t) offset_high << 32) | offset_low); 59 } 60 61 SYSCALL_DEFINE3(ia32_ftruncate64, unsigned int, fd, 62 unsigned long, offset_low, unsigned long, offset_high) 63 { 64 return ksys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low); 65 } 66 67 /* warning: next two assume little endian */ 68 SYSCALL_DEFINE5(ia32_pread64, unsigned int, fd, char __user *, ubuf, 69 u32, count, u32, poslo, u32, poshi) 70 { 71 return ksys_pread64(fd, ubuf, count, 72 ((loff_t)AA(poshi) << 32) | AA(poslo)); 73 } 74 75 SYSCALL_DEFINE5(ia32_pwrite64, unsigned int, fd, const char __user *, ubuf, 76 u32, count, u32, poslo, u32, poshi) 77 { 78 return ksys_pwrite64(fd, ubuf, count, 79 ((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 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 return ksys_fadvise64_64(fd, 92 (((u64)offset_high)<<32) | offset_low, 93 (((u64)len_high)<<32) | len_low, 94 advice); 95 } 96 97 SYSCALL_DEFINE4(ia32_readahead, int, fd, unsigned int, off_lo, 98 unsigned int, off_hi, size_t, count) 99 { 100 return ksys_readahead(fd, ((u64)off_hi << 32) | off_lo, count); 101 } 102 103 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 return ksys_sync_file_range(fd, 108 ((u64)off_hi << 32) | off_low, 109 ((u64)n_hi << 32) | n_low, flags); 110 } 111 112 SYSCALL_DEFINE5(ia32_fadvise64, int, fd, unsigned int, offset_lo, 113 unsigned int, offset_hi, size_t, len, int, advice) 114 { 115 return ksys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo, 116 len, advice); 117 } 118 119 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 return ksys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo, 124 ((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 static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat) 133 { 134 typeof(ubuf->st_uid) uid = 0; 135 typeof(ubuf->st_gid) gid = 0; 136 SET_UID(uid, from_kuid_munged(current_user_ns(), stat->uid)); 137 SET_GID(gid, from_kgid_munged(current_user_ns(), stat->gid)); 138 if (!access_ok(ubuf, sizeof(struct stat64)) || 139 __put_user(huge_encode_dev(stat->dev), &ubuf->st_dev) || 140 __put_user(stat->ino, &ubuf->__st_ino) || 141 __put_user(stat->ino, &ubuf->st_ino) || 142 __put_user(stat->mode, &ubuf->st_mode) || 143 __put_user(stat->nlink, &ubuf->st_nlink) || 144 __put_user(uid, &ubuf->st_uid) || 145 __put_user(gid, &ubuf->st_gid) || 146 __put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev) || 147 __put_user(stat->size, &ubuf->st_size) || 148 __put_user(stat->atime.tv_sec, &ubuf->st_atime) || 149 __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec) || 150 __put_user(stat->mtime.tv_sec, &ubuf->st_mtime) || 151 __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec) || 152 __put_user(stat->ctime.tv_sec, &ubuf->st_ctime) || 153 __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec) || 154 __put_user(stat->blksize, &ubuf->st_blksize) || 155 __put_user(stat->blocks, &ubuf->st_blocks)) 156 return -EFAULT; 157 return 0; 158 } 159 160 COMPAT_SYSCALL_DEFINE2(ia32_stat64, const char __user *, filename, 161 struct stat64 __user *, statbuf) 162 { 163 struct kstat stat; 164 int ret = vfs_stat(filename, &stat); 165 166 if (!ret) 167 ret = cp_stat64(statbuf, &stat); 168 return ret; 169 } 170 171 COMPAT_SYSCALL_DEFINE2(ia32_lstat64, const char __user *, filename, 172 struct stat64 __user *, statbuf) 173 { 174 struct kstat stat; 175 int ret = vfs_lstat(filename, &stat); 176 if (!ret) 177 ret = cp_stat64(statbuf, &stat); 178 return ret; 179 } 180 181 COMPAT_SYSCALL_DEFINE2(ia32_fstat64, unsigned int, fd, 182 struct stat64 __user *, statbuf) 183 { 184 struct kstat stat; 185 int ret = vfs_fstat(fd, &stat); 186 if (!ret) 187 ret = cp_stat64(statbuf, &stat); 188 return ret; 189 } 190 191 COMPAT_SYSCALL_DEFINE4(ia32_fstatat64, unsigned int, dfd, 192 const char __user *, filename, 193 struct stat64 __user *, statbuf, int, flag) 194 { 195 struct kstat stat; 196 int error; 197 198 error = vfs_fstatat(dfd, filename, &stat, flag); 199 if (error) 200 return error; 201 return cp_stat64(statbuf, &stat); 202 } 203 204 /* 205 * Linux/i386 didn't use to be able to handle more than 206 * 4 system call parameters, so these system calls used a memory 207 * block for parameter passing.. 208 */ 209 210 struct mmap_arg_struct32 { 211 unsigned int addr; 212 unsigned int len; 213 unsigned int prot; 214 unsigned int flags; 215 unsigned int fd; 216 unsigned int offset; 217 }; 218 219 COMPAT_SYSCALL_DEFINE1(ia32_mmap, struct mmap_arg_struct32 __user *, arg) 220 { 221 struct mmap_arg_struct32 a; 222 223 if (copy_from_user(&a, arg, sizeof(a))) 224 return -EFAULT; 225 226 if (a.offset & ~PAGE_MASK) 227 return -EINVAL; 228 229 return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, 230 a.offset>>PAGE_SHIFT); 231 } 232 233 /* 234 * The 32-bit clone ABI is CONFIG_CLONE_BACKWARDS 235 */ 236 COMPAT_SYSCALL_DEFINE5(ia32_clone, unsigned long, clone_flags, 237 unsigned long, newsp, int __user *, parent_tidptr, 238 unsigned long, tls_val, int __user *, child_tidptr) 239 { 240 struct kernel_clone_args args = { 241 .flags = (clone_flags & ~CSIGNAL), 242 .pidfd = parent_tidptr, 243 .child_tid = child_tidptr, 244 .parent_tid = parent_tidptr, 245 .exit_signal = (clone_flags & CSIGNAL), 246 .stack = newsp, 247 .tls = tls_val, 248 }; 249 250 if (!legacy_clone_args_valid(&args)) 251 return -EINVAL; 252 253 return _do_fork(&args); 254 } 255 #endif /* CONFIG_IA32_EMULATION */ 256