255 lines
7.3 KiB
C
255 lines
7.3 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 <linux/sched/task.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/ia32.h>
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#define AA(__x) ((unsigned long)(__x))
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COMPAT_SYSCALL_DEFINE3(x86_truncate64, const char __user *, filename,
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unsigned long, offset_low, unsigned long, offset_high)
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{
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return ksys_truncate(filename,
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((loff_t) offset_high << 32) | offset_low);
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}
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COMPAT_SYSCALL_DEFINE3(x86_ftruncate64, unsigned int, fd,
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unsigned long, offset_low, unsigned long, offset_high)
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{
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return ksys_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(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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COMPAT_SYSCALL_DEFINE2(x86_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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COMPAT_SYSCALL_DEFINE2(x86_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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COMPAT_SYSCALL_DEFINE2(x86_fstat64, unsigned int, fd,
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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_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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COMPAT_SYSCALL_DEFINE4(x86_fstatat, unsigned int, dfd,
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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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COMPAT_SYSCALL_DEFINE1(x86_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 ksys_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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/* warning: next two assume little endian */
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COMPAT_SYSCALL_DEFINE5(x86_pread, unsigned int, fd, char __user *, ubuf,
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u32, count, u32, poslo, u32, poshi)
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{
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return ksys_pread64(fd, ubuf, count,
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((loff_t)AA(poshi) << 32) | AA(poslo));
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}
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COMPAT_SYSCALL_DEFINE5(x86_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 ksys_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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COMPAT_SYSCALL_DEFINE6(x86_fadvise64_64, int, fd, __u32, offset_low,
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__u32, offset_high, __u32, len_low, __u32, len_high,
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int, advice)
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{
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return ksys_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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COMPAT_SYSCALL_DEFINE4(x86_readahead, int, fd, unsigned int, off_lo,
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unsigned int, off_hi, size_t, count)
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{
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return ksys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
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}
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COMPAT_SYSCALL_DEFINE6(x86_sync_file_range, int, fd, unsigned int, off_low,
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unsigned int, off_hi, unsigned int, n_low,
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unsigned int, n_hi, int, flags)
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{
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return ksys_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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COMPAT_SYSCALL_DEFINE5(x86_fadvise64, int, fd, unsigned int, offset_lo,
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unsigned int, offset_hi, size_t, len, int, advice)
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{
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return ksys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
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len, advice);
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}
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COMPAT_SYSCALL_DEFINE6(x86_fallocate, int, fd, int, mode,
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unsigned int, offset_lo, unsigned int, offset_hi,
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unsigned int, len_lo, unsigned int, len_hi)
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{
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return ksys_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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/*
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* The 32-bit clone ABI is CONFIG_CLONE_BACKWARDS
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*/
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COMPAT_SYSCALL_DEFINE5(x86_clone, unsigned long, clone_flags,
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unsigned long, newsp, int __user *, parent_tidptr,
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unsigned long, tls_val, int __user *, child_tidptr)
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{
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struct kernel_clone_args args = {
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.flags = (clone_flags & ~CSIGNAL),
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.pidfd = parent_tidptr,
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.child_tid = child_tidptr,
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.parent_tid = parent_tidptr,
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.exit_signal = (clone_flags & CSIGNAL),
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.stack = newsp,
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.tls = tls_val,
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};
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if (!legacy_clone_args_valid(&args))
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return -EINVAL;
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return _do_fork(&args);
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}
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