233 lines
6.6 KiB
C
233 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Based on
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* sys_sparc32
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*
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* Copyright (C) 2000 VA Linux Co
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* Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
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* Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
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* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 2000 Hewlett-Packard Co.
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* Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
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* Copyright (C) 2000,2001,2002 Andi Kleen, SuSE Labs (x86-64 port)
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*
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* These routines maintain argument size conversion between 32bit and 64bit
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* environment. In 2.5 most of this should be moved to a generic directory.
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*
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* This file assumes that there is a hole at the end of user address space.
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*
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* Some of the functions are LE specific currently. These are
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* hopefully all marked. This should be fixed.
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/signal.h>
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#include <linux/syscalls.h>
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#include <linux/times.h>
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#include <linux/utsname.h>
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#include <linux/mm.h>
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#include <linux/uio.h>
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#include <linux/poll.h>
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#include <linux/personality.h>
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#include <linux/stat.h>
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#include <linux/rwsem.h>
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#include <linux/compat.h>
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#include <linux/vfs.h>
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#include <linux/ptrace.h>
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#include <linux/highuid.h>
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#include <linux/sysctl.h>
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#include <linux/slab.h>
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#include <asm/mman.h>
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#include <asm/types.h>
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#include <linux/uaccess.h>
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#include <linux/atomic.h>
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#include <asm/vgtod.h>
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#include <asm/sys_ia32.h>
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#define AA(__x) ((unsigned long)(__x))
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asmlinkage long sys32_truncate64(const char __user *filename,
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unsigned long offset_low,
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unsigned long offset_high)
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{
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return sys_truncate(filename, ((loff_t) offset_high << 32) | offset_low);
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}
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asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long offset_low,
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unsigned long offset_high)
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{
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return sys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low);
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}
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/*
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* Another set for IA32/LFS -- x86_64 struct stat is different due to
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* support for 64bit inode numbers.
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*/
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static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat)
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{
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typeof(ubuf->st_uid) uid = 0;
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typeof(ubuf->st_gid) gid = 0;
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SET_UID(uid, from_kuid_munged(current_user_ns(), stat->uid));
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SET_GID(gid, from_kgid_munged(current_user_ns(), stat->gid));
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if (!access_ok(VERIFY_WRITE, ubuf, sizeof(struct stat64)) ||
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__put_user(huge_encode_dev(stat->dev), &ubuf->st_dev) ||
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__put_user(stat->ino, &ubuf->__st_ino) ||
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__put_user(stat->ino, &ubuf->st_ino) ||
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__put_user(stat->mode, &ubuf->st_mode) ||
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__put_user(stat->nlink, &ubuf->st_nlink) ||
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__put_user(uid, &ubuf->st_uid) ||
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__put_user(gid, &ubuf->st_gid) ||
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__put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev) ||
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__put_user(stat->size, &ubuf->st_size) ||
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__put_user(stat->atime.tv_sec, &ubuf->st_atime) ||
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__put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec) ||
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__put_user(stat->mtime.tv_sec, &ubuf->st_mtime) ||
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__put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec) ||
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__put_user(stat->ctime.tv_sec, &ubuf->st_ctime) ||
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__put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec) ||
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__put_user(stat->blksize, &ubuf->st_blksize) ||
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__put_user(stat->blocks, &ubuf->st_blocks))
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return -EFAULT;
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return 0;
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}
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asmlinkage long sys32_stat64(const char __user *filename,
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struct stat64 __user *statbuf)
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{
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struct kstat stat;
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int ret = vfs_stat(filename, &stat);
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if (!ret)
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ret = cp_stat64(statbuf, &stat);
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return ret;
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}
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asmlinkage long sys32_lstat64(const char __user *filename,
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struct stat64 __user *statbuf)
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{
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struct kstat stat;
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int ret = vfs_lstat(filename, &stat);
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if (!ret)
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ret = cp_stat64(statbuf, &stat);
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return ret;
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}
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asmlinkage long sys32_fstat64(unsigned int fd, struct stat64 __user *statbuf)
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{
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struct kstat stat;
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int ret = vfs_fstat(fd, &stat);
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if (!ret)
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ret = cp_stat64(statbuf, &stat);
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return ret;
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}
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asmlinkage long sys32_fstatat(unsigned int dfd, const char __user *filename,
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struct stat64 __user *statbuf, int flag)
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{
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struct kstat stat;
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int error;
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error = vfs_fstatat(dfd, filename, &stat, flag);
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if (error)
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return error;
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return cp_stat64(statbuf, &stat);
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}
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/*
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* Linux/i386 didn't use to be able to handle more than
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* 4 system call parameters, so these system calls used a memory
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* block for parameter passing..
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*/
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struct mmap_arg_struct32 {
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unsigned int addr;
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unsigned int len;
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unsigned int prot;
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unsigned int flags;
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unsigned int fd;
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unsigned int offset;
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};
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asmlinkage long sys32_mmap(struct mmap_arg_struct32 __user *arg)
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{
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struct mmap_arg_struct32 a;
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if (copy_from_user(&a, arg, sizeof(a)))
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return -EFAULT;
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if (a.offset & ~PAGE_MASK)
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return -EINVAL;
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return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
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a.offset>>PAGE_SHIFT);
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}
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asmlinkage long sys32_waitpid(compat_pid_t pid, unsigned int __user *stat_addr,
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int options)
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{
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return compat_sys_wait4(pid, stat_addr, options, NULL);
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}
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/* warning: next two assume little endian */
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asmlinkage long sys32_pread(unsigned int fd, char __user *ubuf, u32 count,
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u32 poslo, u32 poshi)
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{
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return sys_pread64(fd, ubuf, count,
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((loff_t)AA(poshi) << 32) | AA(poslo));
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}
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asmlinkage long sys32_pwrite(unsigned int fd, const char __user *ubuf,
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u32 count, u32 poslo, u32 poshi)
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{
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return sys_pwrite64(fd, ubuf, count,
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((loff_t)AA(poshi) << 32) | AA(poslo));
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}
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/*
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* Some system calls that need sign extended arguments. This could be
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* done by a generic wrapper.
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*/
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long sys32_fadvise64_64(int fd, __u32 offset_low, __u32 offset_high,
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__u32 len_low, __u32 len_high, int advice)
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{
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return sys_fadvise64_64(fd,
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(((u64)offset_high)<<32) | offset_low,
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(((u64)len_high)<<32) | len_low,
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advice);
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}
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asmlinkage ssize_t sys32_readahead(int fd, unsigned off_lo, unsigned off_hi,
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size_t count)
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{
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return sys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
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}
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asmlinkage long sys32_sync_file_range(int fd, unsigned off_low, unsigned off_hi,
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unsigned n_low, unsigned n_hi, int flags)
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{
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return sys_sync_file_range(fd,
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((u64)off_hi << 32) | off_low,
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((u64)n_hi << 32) | n_low, flags);
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}
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asmlinkage long sys32_fadvise64(int fd, unsigned offset_lo, unsigned offset_hi,
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size_t len, int advice)
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{
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return sys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
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len, advice);
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}
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asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_lo,
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unsigned offset_hi, unsigned len_lo,
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unsigned len_hi)
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{
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return sys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
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((u64)len_hi << 32) | len_lo);
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}
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