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256 lines
7.4 KiB
256 lines
7.4 KiB
// 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 <[email protected]> |
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* Copyright (C) 1999 Arun Sharma <[email protected]> |
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* Copyright (C) 1997,1998 Jakub Jelinek ([email protected]) |
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* Copyright (C) 1997 David S. Miller ([email protected]) |
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* Copyright (C) 2000 Hewlett-Packard Co. |
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* Copyright (C) 2000 David Mosberger-Tang <[email protected]> |
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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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SYSCALL_DEFINE3(ia32_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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SYSCALL_DEFINE3(ia32_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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/* warning: next two assume little endian */ |
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SYSCALL_DEFINE5(ia32_pread64, 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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SYSCALL_DEFINE5(ia32_pwrite64, 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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SYSCALL_DEFINE6(ia32_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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SYSCALL_DEFINE4(ia32_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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SYSCALL_DEFINE6(ia32_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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SYSCALL_DEFINE5(ia32_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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SYSCALL_DEFINE6(ia32_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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#ifdef CONFIG_IA32_EMULATION |
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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 (!user_write_access_begin(ubuf, sizeof(struct stat64))) |
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return -EFAULT; |
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unsafe_put_user(huge_encode_dev(stat->dev), &ubuf->st_dev, Efault); |
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unsafe_put_user(stat->ino, &ubuf->__st_ino, Efault); |
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unsafe_put_user(stat->ino, &ubuf->st_ino, Efault); |
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unsafe_put_user(stat->mode, &ubuf->st_mode, Efault); |
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unsafe_put_user(stat->nlink, &ubuf->st_nlink, Efault); |
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unsafe_put_user(uid, &ubuf->st_uid, Efault); |
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unsafe_put_user(gid, &ubuf->st_gid, Efault); |
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unsafe_put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev, Efault); |
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unsafe_put_user(stat->size, &ubuf->st_size, Efault); |
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unsafe_put_user(stat->atime.tv_sec, &ubuf->st_atime, Efault); |
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unsafe_put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec, Efault); |
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unsafe_put_user(stat->mtime.tv_sec, &ubuf->st_mtime, Efault); |
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unsafe_put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec, Efault); |
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unsafe_put_user(stat->ctime.tv_sec, &ubuf->st_ctime, Efault); |
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unsafe_put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec, Efault); |
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unsafe_put_user(stat->blksize, &ubuf->st_blksize, Efault); |
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unsafe_put_user(stat->blocks, &ubuf->st_blocks, Efault); |
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user_access_end(); |
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return 0; |
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Efault: |
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user_write_access_end(); |
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return -EFAULT; |
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} |
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COMPAT_SYSCALL_DEFINE2(ia32_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(ia32_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(ia32_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(ia32_fstatat64, 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(ia32_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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/* |
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* The 32-bit clone ABI is CONFIG_CLONE_BACKWARDS |
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*/ |
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COMPAT_SYSCALL_DEFINE5(ia32_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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return kernel_clone(&args); |
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} |
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#endif /* CONFIG_IA32_EMULATION */
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