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 FTRUNCATE_LFS); 66 } 67 68 /* warning: next two assume little endian */ 69 SYSCALL_DEFINE5(ia32_pread64, unsigned int, fd, char __user *, ubuf, 70 u32, count, u32, poslo, u32, poshi) 71 { 72 return ksys_pread64(fd, ubuf, count, 73 ((loff_t)AA(poshi) << 32) | AA(poslo)); 74 } 75 76 SYSCALL_DEFINE5(ia32_pwrite64, unsigned int, fd, const char __user *, ubuf, 77 u32, count, u32, poslo, u32, poshi) 78 { 79 return ksys_pwrite64(fd, ubuf, count, 80 ((loff_t)AA(poshi) << 32) | AA(poslo)); 81 } 82 83 84 /* 85 * Some system calls that need sign extended arguments. This could be 86 * done by a generic wrapper. 87 */ 88 SYSCALL_DEFINE6(ia32_fadvise64_64, int, fd, __u32, offset_low, 89 __u32, offset_high, __u32, len_low, __u32, len_high, 90 int, advice) 91 { 92 return ksys_fadvise64_64(fd, 93 (((u64)offset_high)<<32) | offset_low, 94 (((u64)len_high)<<32) | len_low, 95 advice); 96 } 97 98 SYSCALL_DEFINE4(ia32_readahead, int, fd, unsigned int, off_lo, 99 unsigned int, off_hi, size_t, count) 100 { 101 return ksys_readahead(fd, ((u64)off_hi << 32) | off_lo, count); 102 } 103 104 SYSCALL_DEFINE6(ia32_sync_file_range, int, fd, unsigned int, off_low, 105 unsigned int, off_hi, unsigned int, n_low, 106 unsigned int, n_hi, int, flags) 107 { 108 return ksys_sync_file_range(fd, 109 ((u64)off_hi << 32) | off_low, 110 ((u64)n_hi << 32) | n_low, flags); 111 } 112 113 SYSCALL_DEFINE5(ia32_fadvise64, int, fd, unsigned int, offset_lo, 114 unsigned int, offset_hi, size_t, len, int, advice) 115 { 116 return ksys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo, 117 len, advice); 118 } 119 120 SYSCALL_DEFINE6(ia32_fallocate, int, fd, int, mode, 121 unsigned int, offset_lo, unsigned int, offset_hi, 122 unsigned int, len_lo, unsigned int, len_hi) 123 { 124 return ksys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo, 125 ((u64)len_hi << 32) | len_lo); 126 } 127 128 #ifdef CONFIG_IA32_EMULATION 129 /* 130 * Another set for IA32/LFS -- x86_64 struct stat is different due to 131 * support for 64bit inode numbers. 132 */ 133 static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat) 134 { 135 typeof(ubuf->st_uid) uid = 0; 136 typeof(ubuf->st_gid) gid = 0; 137 SET_UID(uid, from_kuid_munged(current_user_ns(), stat->uid)); 138 SET_GID(gid, from_kgid_munged(current_user_ns(), stat->gid)); 139 if (!user_write_access_begin(ubuf, sizeof(struct stat64))) 140 return -EFAULT; 141 unsafe_put_user(huge_encode_dev(stat->dev), &ubuf->st_dev, Efault); 142 unsafe_put_user(stat->ino, &ubuf->__st_ino, Efault); 143 unsafe_put_user(stat->ino, &ubuf->st_ino, Efault); 144 unsafe_put_user(stat->mode, &ubuf->st_mode, Efault); 145 unsafe_put_user(stat->nlink, &ubuf->st_nlink, Efault); 146 unsafe_put_user(uid, &ubuf->st_uid, Efault); 147 unsafe_put_user(gid, &ubuf->st_gid, Efault); 148 unsafe_put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev, Efault); 149 unsafe_put_user(stat->size, &ubuf->st_size, Efault); 150 unsafe_put_user(stat->atime.tv_sec, &ubuf->st_atime, Efault); 151 unsafe_put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec, Efault); 152 unsafe_put_user(stat->mtime.tv_sec, &ubuf->st_mtime, Efault); 153 unsafe_put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec, Efault); 154 unsafe_put_user(stat->ctime.tv_sec, &ubuf->st_ctime, Efault); 155 unsafe_put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec, Efault); 156 unsafe_put_user(stat->blksize, &ubuf->st_blksize, Efault); 157 unsafe_put_user(stat->blocks, &ubuf->st_blocks, Efault); 158 user_access_end(); 159 return 0; 160 Efault: 161 user_write_access_end(); 162 return -EFAULT; 163 } 164 165 COMPAT_SYSCALL_DEFINE2(ia32_stat64, const char __user *, filename, 166 struct stat64 __user *, statbuf) 167 { 168 struct kstat stat; 169 int ret = vfs_stat(filename, &stat); 170 171 if (!ret) 172 ret = cp_stat64(statbuf, &stat); 173 return ret; 174 } 175 176 COMPAT_SYSCALL_DEFINE2(ia32_lstat64, const char __user *, filename, 177 struct stat64 __user *, statbuf) 178 { 179 struct kstat stat; 180 int ret = vfs_lstat(filename, &stat); 181 if (!ret) 182 ret = cp_stat64(statbuf, &stat); 183 return ret; 184 } 185 186 COMPAT_SYSCALL_DEFINE2(ia32_fstat64, unsigned int, fd, 187 struct stat64 __user *, statbuf) 188 { 189 struct kstat stat; 190 int ret = vfs_fstat(fd, &stat); 191 if (!ret) 192 ret = cp_stat64(statbuf, &stat); 193 return ret; 194 } 195 196 COMPAT_SYSCALL_DEFINE4(ia32_fstatat64, unsigned int, dfd, 197 const char __user *, filename, 198 struct stat64 __user *, statbuf, int, flag) 199 { 200 struct kstat stat; 201 int error; 202 203 error = vfs_fstatat(dfd, filename, &stat, flag); 204 if (error) 205 return error; 206 return cp_stat64(statbuf, &stat); 207 } 208 209 /* 210 * Linux/i386 didn't use to be able to handle more than 211 * 4 system call parameters, so these system calls used a memory 212 * block for parameter passing.. 213 */ 214 215 struct mmap_arg_struct32 { 216 unsigned int addr; 217 unsigned int len; 218 unsigned int prot; 219 unsigned int flags; 220 unsigned int fd; 221 unsigned int offset; 222 }; 223 224 COMPAT_SYSCALL_DEFINE1(ia32_mmap, struct mmap_arg_struct32 __user *, arg) 225 { 226 struct mmap_arg_struct32 a; 227 228 if (copy_from_user(&a, arg, sizeof(a))) 229 return -EFAULT; 230 231 if (a.offset & ~PAGE_MASK) 232 return -EINVAL; 233 234 return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, 235 a.offset>>PAGE_SHIFT); 236 } 237 238 /* 239 * The 32-bit clone ABI is CONFIG_CLONE_BACKWARDS 240 */ 241 COMPAT_SYSCALL_DEFINE5(ia32_clone, unsigned long, clone_flags, 242 unsigned long, newsp, int __user *, parent_tidptr, 243 unsigned long, tls_val, int __user *, child_tidptr) 244 { 245 struct kernel_clone_args args = { 246 .flags = (clone_flags & ~CSIGNAL), 247 .pidfd = parent_tidptr, 248 .child_tid = child_tidptr, 249 .parent_tid = parent_tidptr, 250 .exit_signal = (clone_flags & CSIGNAL), 251 .stack = newsp, 252 .tls = tls_val, 253 }; 254 255 return kernel_clone(&args); 256 } 257 #endif /* CONFIG_IA32_EMULATION */ 258