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fef747bab3
s390 has an almost identical copy of the code in kernel/uid16.c. The problem here is that it requires calling the regular system calls, which the generic implementation handles correctly, but the internal interfaces are not declared in a global header for this. The best way forward here seems to be to just use the generic code and delete the s390 specific implementation. I keep the changes to uapi/asm/posix_types.h inside of an #ifdef check so user space does not observe any changes. As some of the system calls pass pointers, we also need wrappers in compat_wrapper.c, which I add for all calls with at least one argument. All those wrappers can be removed in a later step. Link: https://lore.kernel.org/lkml/20190116131527.2071570-4-arnd@arndb.de Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
289 lines
7.8 KiB
C
289 lines
7.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* S390 version
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* Copyright IBM Corp. 2000
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* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
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* Gerhard Tonn (ton@de.ibm.com)
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* Thomas Spatzier (tspat@de.ibm.com)
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*
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* Conversion between 31bit and 64bit native syscalls.
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*
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* Heavily inspired by the 32-bit Sparc compat code which is
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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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*
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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/mm.h>
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#include <linux/file.h>
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#include <linux/signal.h>
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#include <linux/resource.h>
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#include <linux/times.h>
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#include <linux/smp.h>
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#include <linux/sem.h>
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#include <linux/msg.h>
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#include <linux/shm.h>
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#include <linux/uio.h>
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#include <linux/quota.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/filter.h>
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#include <linux/highmem.h>
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#include <linux/mman.h>
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#include <linux/ipv6.h>
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#include <linux/in.h>
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#include <linux/icmpv6.h>
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#include <linux/syscalls.h>
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#include <linux/sysctl.h>
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#include <linux/binfmts.h>
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#include <linux/capability.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/fadvise.h>
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#include <linux/ipc.h>
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#include <linux/slab.h>
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#include <asm/types.h>
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#include <linux/uaccess.h>
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#include <net/scm.h>
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#include <net/sock.h>
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#include "compat_linux.h"
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#ifdef CONFIG_SYSVIPC
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COMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, compat_ulong_t, second,
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compat_ulong_t, third, compat_uptr_t, ptr)
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{
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if (call >> 16) /* hack for backward compatibility */
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return -EINVAL;
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return compat_ksys_ipc(call, first, second, third, ptr, third);
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}
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#endif
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COMPAT_SYSCALL_DEFINE3(s390_truncate64, const char __user *, path, u32, high, u32, low)
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{
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return ksys_truncate(path, (unsigned long)high << 32 | low);
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}
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COMPAT_SYSCALL_DEFINE3(s390_ftruncate64, unsigned int, fd, u32, high, u32, low)
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{
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return ksys_ftruncate(fd, (unsigned long)high << 32 | low);
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}
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COMPAT_SYSCALL_DEFINE5(s390_pread64, unsigned int, fd, char __user *, ubuf,
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compat_size_t, count, u32, high, u32, low)
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{
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if ((compat_ssize_t) count < 0)
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return -EINVAL;
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return ksys_pread64(fd, ubuf, count, (unsigned long)high << 32 | low);
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}
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COMPAT_SYSCALL_DEFINE5(s390_pwrite64, unsigned int, fd, const char __user *, ubuf,
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compat_size_t, count, u32, high, u32, low)
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{
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if ((compat_ssize_t) count < 0)
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return -EINVAL;
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return ksys_pwrite64(fd, ubuf, count, (unsigned long)high << 32 | low);
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}
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COMPAT_SYSCALL_DEFINE4(s390_readahead, int, fd, u32, high, u32, low, s32, count)
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{
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return ksys_readahead(fd, (unsigned long)high << 32 | low, count);
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}
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struct stat64_emu31 {
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unsigned long long st_dev;
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unsigned int __pad1;
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#define STAT64_HAS_BROKEN_ST_INO 1
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u32 __st_ino;
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unsigned int st_mode;
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unsigned int st_nlink;
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u32 st_uid;
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u32 st_gid;
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unsigned long long st_rdev;
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unsigned int __pad3;
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long st_size;
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u32 st_blksize;
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unsigned char __pad4[4];
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u32 __pad5; /* future possible st_blocks high bits */
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u32 st_blocks; /* Number 512-byte blocks allocated. */
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u32 st_atime;
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u32 __pad6;
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u32 st_mtime;
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u32 __pad7;
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u32 st_ctime;
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u32 __pad8; /* will be high 32 bits of ctime someday */
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unsigned long st_ino;
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};
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static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
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{
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struct stat64_emu31 tmp;
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memset(&tmp, 0, sizeof(tmp));
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tmp.st_dev = huge_encode_dev(stat->dev);
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tmp.st_ino = stat->ino;
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tmp.__st_ino = (u32)stat->ino;
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tmp.st_mode = stat->mode;
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tmp.st_nlink = (unsigned int)stat->nlink;
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tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
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tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
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tmp.st_rdev = huge_encode_dev(stat->rdev);
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tmp.st_size = stat->size;
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tmp.st_blksize = (u32)stat->blksize;
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tmp.st_blocks = (u32)stat->blocks;
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tmp.st_atime = (u32)stat->atime.tv_sec;
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tmp.st_mtime = (u32)stat->mtime.tv_sec;
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tmp.st_ctime = (u32)stat->ctime.tv_sec;
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return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
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}
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COMPAT_SYSCALL_DEFINE2(s390_stat64, const char __user *, filename, struct stat64_emu31 __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(s390_lstat64, const char __user *, filename, struct stat64_emu31 __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(s390_fstat64, unsigned int, fd, struct stat64_emu31 __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(s390_fstatat64, unsigned int, dfd, const char __user *, filename,
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struct stat64_emu31 __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_struct_emu31 {
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compat_ulong_t addr;
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compat_ulong_t len;
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compat_ulong_t prot;
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compat_ulong_t flags;
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compat_ulong_t fd;
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compat_ulong_t offset;
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};
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COMPAT_SYSCALL_DEFINE1(s390_old_mmap, struct mmap_arg_struct_emu31 __user *, arg)
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{
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struct mmap_arg_struct_emu31 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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COMPAT_SYSCALL_DEFINE1(s390_mmap2, struct mmap_arg_struct_emu31 __user *, arg)
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{
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struct mmap_arg_struct_emu31 a;
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if (copy_from_user(&a, arg, sizeof(a)))
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return -EFAULT;
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return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
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}
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COMPAT_SYSCALL_DEFINE3(s390_read, unsigned int, fd, char __user *, buf, compat_size_t, count)
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{
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if ((compat_ssize_t) count < 0)
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return -EINVAL;
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return ksys_read(fd, buf, count);
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}
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COMPAT_SYSCALL_DEFINE3(s390_write, unsigned int, fd, const char __user *, buf, compat_size_t, count)
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{
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if ((compat_ssize_t) count < 0)
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return -EINVAL;
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return ksys_write(fd, buf, count);
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}
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/*
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* 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
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* These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
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* because the 31 bit values differ from the 64 bit values.
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*/
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COMPAT_SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, high, u32, low, compat_size_t, len, int, advise)
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{
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if (advise == 4)
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advise = POSIX_FADV_DONTNEED;
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else if (advise == 5)
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advise = POSIX_FADV_NOREUSE;
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return ksys_fadvise64_64(fd, (unsigned long)high << 32 | low, len,
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advise);
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}
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struct fadvise64_64_args {
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int fd;
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long long offset;
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long long len;
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int advice;
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};
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COMPAT_SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args)
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{
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struct fadvise64_64_args a;
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if ( copy_from_user(&a, args, sizeof(a)) )
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return -EFAULT;
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if (a.advice == 4)
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a.advice = POSIX_FADV_DONTNEED;
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else if (a.advice == 5)
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a.advice = POSIX_FADV_NOREUSE;
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return ksys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
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}
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COMPAT_SYSCALL_DEFINE6(s390_sync_file_range, int, fd, u32, offhigh, u32, offlow,
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u32, nhigh, u32, nlow, unsigned int, flags)
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{
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return ksys_sync_file_range(fd, ((loff_t)offhigh << 32) + offlow,
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((u64)nhigh << 32) + nlow, flags);
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}
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COMPAT_SYSCALL_DEFINE6(s390_fallocate, int, fd, int, mode, u32, offhigh, u32, offlow,
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u32, lenhigh, u32, lenlow)
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{
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return ksys_fallocate(fd, mode, ((loff_t)offhigh << 32) + offlow,
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((u64)lenhigh << 32) + lenlow);
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}
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