123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256 |
- // SPDX-License-Identifier: GPL-2.0
- /*
- * sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Based on
- * sys_sparc32
- *
- * Copyright (C) 2000 VA Linux Co
- * Copyright (C) 2000 Don Dugger <[email protected]>
- * Copyright (C) 1999 Arun Sharma <[email protected]>
- * Copyright (C) 1997,1998 Jakub Jelinek ([email protected])
- * Copyright (C) 1997 David S. Miller ([email protected])
- * Copyright (C) 2000 Hewlett-Packard Co.
- * Copyright (C) 2000 David Mosberger-Tang <[email protected]>
- * Copyright (C) 2000,2001,2002 Andi Kleen, SuSE Labs (x86-64 port)
- *
- * These routines maintain argument size conversion between 32bit and 64bit
- * environment. In 2.5 most of this should be moved to a generic directory.
- *
- * This file assumes that there is a hole at the end of user address space.
- *
- * Some of the functions are LE specific currently. These are
- * hopefully all marked. This should be fixed.
- */
- #include <linux/kernel.h>
- #include <linux/sched.h>
- #include <linux/fs.h>
- #include <linux/file.h>
- #include <linux/signal.h>
- #include <linux/syscalls.h>
- #include <linux/times.h>
- #include <linux/utsname.h>
- #include <linux/mm.h>
- #include <linux/uio.h>
- #include <linux/poll.h>
- #include <linux/personality.h>
- #include <linux/stat.h>
- #include <linux/rwsem.h>
- #include <linux/compat.h>
- #include <linux/vfs.h>
- #include <linux/ptrace.h>
- #include <linux/highuid.h>
- #include <linux/sysctl.h>
- #include <linux/slab.h>
- #include <linux/sched/task.h>
- #include <asm/mman.h>
- #include <asm/types.h>
- #include <linux/uaccess.h>
- #include <linux/atomic.h>
- #include <asm/vgtod.h>
- #include <asm/ia32.h>
- #define AA(__x) ((unsigned long)(__x))
- SYSCALL_DEFINE3(ia32_truncate64, const char __user *, filename,
- unsigned long, offset_low, unsigned long, offset_high)
- {
- return ksys_truncate(filename,
- ((loff_t) offset_high << 32) | offset_low);
- }
- SYSCALL_DEFINE3(ia32_ftruncate64, unsigned int, fd,
- unsigned long, offset_low, unsigned long, offset_high)
- {
- return ksys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low);
- }
- /* warning: next two assume little endian */
- SYSCALL_DEFINE5(ia32_pread64, unsigned int, fd, char __user *, ubuf,
- u32, count, u32, poslo, u32, poshi)
- {
- return ksys_pread64(fd, ubuf, count,
- ((loff_t)AA(poshi) << 32) | AA(poslo));
- }
- SYSCALL_DEFINE5(ia32_pwrite64, unsigned int, fd, const char __user *, ubuf,
- u32, count, u32, poslo, u32, poshi)
- {
- return ksys_pwrite64(fd, ubuf, count,
- ((loff_t)AA(poshi) << 32) | AA(poslo));
- }
- /*
- * Some system calls that need sign extended arguments. This could be
- * done by a generic wrapper.
- */
- SYSCALL_DEFINE6(ia32_fadvise64_64, int, fd, __u32, offset_low,
- __u32, offset_high, __u32, len_low, __u32, len_high,
- int, advice)
- {
- return ksys_fadvise64_64(fd,
- (((u64)offset_high)<<32) | offset_low,
- (((u64)len_high)<<32) | len_low,
- advice);
- }
- SYSCALL_DEFINE4(ia32_readahead, int, fd, unsigned int, off_lo,
- unsigned int, off_hi, size_t, count)
- {
- return ksys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
- }
- SYSCALL_DEFINE6(ia32_sync_file_range, int, fd, unsigned int, off_low,
- unsigned int, off_hi, unsigned int, n_low,
- unsigned int, n_hi, int, flags)
- {
- return ksys_sync_file_range(fd,
- ((u64)off_hi << 32) | off_low,
- ((u64)n_hi << 32) | n_low, flags);
- }
- SYSCALL_DEFINE5(ia32_fadvise64, int, fd, unsigned int, offset_lo,
- unsigned int, offset_hi, size_t, len, int, advice)
- {
- return ksys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
- len, advice);
- }
- SYSCALL_DEFINE6(ia32_fallocate, int, fd, int, mode,
- unsigned int, offset_lo, unsigned int, offset_hi,
- unsigned int, len_lo, unsigned int, len_hi)
- {
- return ksys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
- ((u64)len_hi << 32) | len_lo);
- }
- #ifdef CONFIG_IA32_EMULATION
- /*
- * Another set for IA32/LFS -- x86_64 struct stat is different due to
- * support for 64bit inode numbers.
- */
- static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat)
- {
- typeof(ubuf->st_uid) uid = 0;
- typeof(ubuf->st_gid) gid = 0;
- SET_UID(uid, from_kuid_munged(current_user_ns(), stat->uid));
- SET_GID(gid, from_kgid_munged(current_user_ns(), stat->gid));
- if (!user_write_access_begin(ubuf, sizeof(struct stat64)))
- return -EFAULT;
- unsafe_put_user(huge_encode_dev(stat->dev), &ubuf->st_dev, Efault);
- unsafe_put_user(stat->ino, &ubuf->__st_ino, Efault);
- unsafe_put_user(stat->ino, &ubuf->st_ino, Efault);
- unsafe_put_user(stat->mode, &ubuf->st_mode, Efault);
- unsafe_put_user(stat->nlink, &ubuf->st_nlink, Efault);
- unsafe_put_user(uid, &ubuf->st_uid, Efault);
- unsafe_put_user(gid, &ubuf->st_gid, Efault);
- unsafe_put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev, Efault);
- unsafe_put_user(stat->size, &ubuf->st_size, Efault);
- unsafe_put_user(stat->atime.tv_sec, &ubuf->st_atime, Efault);
- unsafe_put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec, Efault);
- unsafe_put_user(stat->mtime.tv_sec, &ubuf->st_mtime, Efault);
- unsafe_put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec, Efault);
- unsafe_put_user(stat->ctime.tv_sec, &ubuf->st_ctime, Efault);
- unsafe_put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec, Efault);
- unsafe_put_user(stat->blksize, &ubuf->st_blksize, Efault);
- unsafe_put_user(stat->blocks, &ubuf->st_blocks, Efault);
- user_access_end();
- return 0;
- Efault:
- user_write_access_end();
- return -EFAULT;
- }
- COMPAT_SYSCALL_DEFINE2(ia32_stat64, const char __user *, filename,
- struct stat64 __user *, statbuf)
- {
- struct kstat stat;
- int ret = vfs_stat(filename, &stat);
- if (!ret)
- ret = cp_stat64(statbuf, &stat);
- return ret;
- }
- COMPAT_SYSCALL_DEFINE2(ia32_lstat64, const char __user *, filename,
- struct stat64 __user *, statbuf)
- {
- struct kstat stat;
- int ret = vfs_lstat(filename, &stat);
- if (!ret)
- ret = cp_stat64(statbuf, &stat);
- return ret;
- }
- COMPAT_SYSCALL_DEFINE2(ia32_fstat64, unsigned int, fd,
- struct stat64 __user *, statbuf)
- {
- struct kstat stat;
- int ret = vfs_fstat(fd, &stat);
- if (!ret)
- ret = cp_stat64(statbuf, &stat);
- return ret;
- }
- COMPAT_SYSCALL_DEFINE4(ia32_fstatat64, unsigned int, dfd,
- const char __user *, filename,
- struct stat64 __user *, statbuf, int, flag)
- {
- struct kstat stat;
- int error;
- error = vfs_fstatat(dfd, filename, &stat, flag);
- if (error)
- return error;
- return cp_stat64(statbuf, &stat);
- }
- /*
- * Linux/i386 didn't use to be able to handle more than
- * 4 system call parameters, so these system calls used a memory
- * block for parameter passing..
- */
- struct mmap_arg_struct32 {
- unsigned int addr;
- unsigned int len;
- unsigned int prot;
- unsigned int flags;
- unsigned int fd;
- unsigned int offset;
- };
- COMPAT_SYSCALL_DEFINE1(ia32_mmap, struct mmap_arg_struct32 __user *, arg)
- {
- struct mmap_arg_struct32 a;
- if (copy_from_user(&a, arg, sizeof(a)))
- return -EFAULT;
- if (a.offset & ~PAGE_MASK)
- return -EINVAL;
- return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
- a.offset>>PAGE_SHIFT);
- }
- /*
- * The 32-bit clone ABI is CONFIG_CLONE_BACKWARDS
- */
- COMPAT_SYSCALL_DEFINE5(ia32_clone, unsigned long, clone_flags,
- unsigned long, newsp, int __user *, parent_tidptr,
- unsigned long, tls_val, int __user *, child_tidptr)
- {
- struct kernel_clone_args args = {
- .flags = (clone_flags & ~CSIGNAL),
- .pidfd = parent_tidptr,
- .child_tid = child_tidptr,
- .parent_tid = parent_tidptr,
- .exit_signal = (clone_flags & CSIGNAL),
- .stack = newsp,
- .tls = tls_val,
- };
- return kernel_clone(&args);
- }
- #endif /* CONFIG_IA32_EMULATION */
|