133 строки
3.2 KiB
C
133 строки
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* linux/fs/compat.c
|
|
*
|
|
* Kernel compatibililty routines for e.g. 32 bit syscall support
|
|
* on 64 bit kernels.
|
|
*
|
|
* Copyright (C) 2002 Stephen Rothwell, IBM Corporation
|
|
* Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
|
|
* Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
|
|
* Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
|
|
* Copyright (C) 2003 Pavel Machek (pavel@ucw.cz)
|
|
*/
|
|
|
|
#include <linux/compat.h>
|
|
#include <linux/nfs4_mount.h>
|
|
#include <linux/syscalls.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/uaccess.h>
|
|
#include "internal.h"
|
|
|
|
struct compat_nfs_string {
|
|
compat_uint_t len;
|
|
compat_uptr_t data;
|
|
};
|
|
|
|
static inline void compat_nfs_string(struct nfs_string *dst,
|
|
struct compat_nfs_string *src)
|
|
{
|
|
dst->data = compat_ptr(src->data);
|
|
dst->len = src->len;
|
|
}
|
|
|
|
struct compat_nfs4_mount_data_v1 {
|
|
compat_int_t version;
|
|
compat_int_t flags;
|
|
compat_int_t rsize;
|
|
compat_int_t wsize;
|
|
compat_int_t timeo;
|
|
compat_int_t retrans;
|
|
compat_int_t acregmin;
|
|
compat_int_t acregmax;
|
|
compat_int_t acdirmin;
|
|
compat_int_t acdirmax;
|
|
struct compat_nfs_string client_addr;
|
|
struct compat_nfs_string mnt_path;
|
|
struct compat_nfs_string hostname;
|
|
compat_uint_t host_addrlen;
|
|
compat_uptr_t host_addr;
|
|
compat_int_t proto;
|
|
compat_int_t auth_flavourlen;
|
|
compat_uptr_t auth_flavours;
|
|
};
|
|
|
|
static int do_nfs4_super_data_conv(void *raw_data)
|
|
{
|
|
int version = *(compat_uint_t *) raw_data;
|
|
|
|
if (version == 1) {
|
|
struct compat_nfs4_mount_data_v1 *raw = raw_data;
|
|
struct nfs4_mount_data *real = raw_data;
|
|
|
|
/* copy the fields backwards */
|
|
real->auth_flavours = compat_ptr(raw->auth_flavours);
|
|
real->auth_flavourlen = raw->auth_flavourlen;
|
|
real->proto = raw->proto;
|
|
real->host_addr = compat_ptr(raw->host_addr);
|
|
real->host_addrlen = raw->host_addrlen;
|
|
compat_nfs_string(&real->hostname, &raw->hostname);
|
|
compat_nfs_string(&real->mnt_path, &raw->mnt_path);
|
|
compat_nfs_string(&real->client_addr, &raw->client_addr);
|
|
real->acdirmax = raw->acdirmax;
|
|
real->acdirmin = raw->acdirmin;
|
|
real->acregmax = raw->acregmax;
|
|
real->acregmin = raw->acregmin;
|
|
real->retrans = raw->retrans;
|
|
real->timeo = raw->timeo;
|
|
real->wsize = raw->wsize;
|
|
real->rsize = raw->rsize;
|
|
real->flags = raw->flags;
|
|
real->version = raw->version;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define NFS4_NAME "nfs4"
|
|
|
|
COMPAT_SYSCALL_DEFINE5(mount, const char __user *, dev_name,
|
|
const char __user *, dir_name,
|
|
const char __user *, type, compat_ulong_t, flags,
|
|
const void __user *, data)
|
|
{
|
|
char *kernel_type;
|
|
void *options;
|
|
char *kernel_dev;
|
|
int retval;
|
|
|
|
kernel_type = copy_mount_string(type);
|
|
retval = PTR_ERR(kernel_type);
|
|
if (IS_ERR(kernel_type))
|
|
goto out;
|
|
|
|
kernel_dev = copy_mount_string(dev_name);
|
|
retval = PTR_ERR(kernel_dev);
|
|
if (IS_ERR(kernel_dev))
|
|
goto out1;
|
|
|
|
options = copy_mount_options(data);
|
|
retval = PTR_ERR(options);
|
|
if (IS_ERR(options))
|
|
goto out2;
|
|
|
|
if (kernel_type && options) {
|
|
if (!strcmp(kernel_type, NFS4_NAME)) {
|
|
retval = -EINVAL;
|
|
if (do_nfs4_super_data_conv(options))
|
|
goto out3;
|
|
}
|
|
}
|
|
|
|
retval = do_mount(kernel_dev, dir_name, kernel_type, flags, options);
|
|
|
|
out3:
|
|
kfree(options);
|
|
out2:
|
|
kfree(kernel_dev);
|
|
out1:
|
|
kfree(kernel_type);
|
|
out:
|
|
return retval;
|
|
}
|