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fs/compat.c
5.09 KB
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/* * 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 |
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* Copyright (C) 2003 Pavel Machek (pavel@ucw.cz) |
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* * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ |
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#include <linux/compat.h> |
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#include <linux/ncp_mount.h> |
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#include <linux/nfs4_mount.h> |
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#include <linux/syscalls.h> |
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#include <linux/slab.h> |
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#include <linux/uaccess.h> |
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#include "internal.h" |
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struct compat_ncp_mount_data { compat_int_t version; compat_uint_t ncp_fd; |
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__compat_uid_t mounted_uid; |
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compat_pid_t wdog_pid; unsigned char mounted_vol[NCP_VOLNAME_LEN + 1]; compat_uint_t time_out; compat_uint_t retry_count; compat_uint_t flags; |
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__compat_uid_t uid; __compat_gid_t gid; |
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compat_mode_t file_mode; compat_mode_t dir_mode; }; struct compat_ncp_mount_data_v4 { compat_int_t version; compat_ulong_t flags; compat_ulong_t mounted_uid; compat_long_t wdog_pid; compat_uint_t ncp_fd; compat_uint_t time_out; compat_uint_t retry_count; compat_ulong_t uid; compat_ulong_t gid; compat_ulong_t file_mode; compat_ulong_t dir_mode; }; static void *do_ncp_super_data_conv(void *raw_data) { int version = *(unsigned int *)raw_data; if (version == 3) { struct compat_ncp_mount_data *c_n = raw_data; struct ncp_mount_data *n = raw_data; n->dir_mode = c_n->dir_mode; n->file_mode = c_n->file_mode; n->gid = c_n->gid; n->uid = c_n->uid; memmove (n->mounted_vol, c_n->mounted_vol, (sizeof (c_n->mounted_vol) + 3 * sizeof (unsigned int))); n->wdog_pid = c_n->wdog_pid; n->mounted_uid = c_n->mounted_uid; } else if (version == 4) { struct compat_ncp_mount_data_v4 *c_n = raw_data; struct ncp_mount_data_v4 *n = raw_data; n->dir_mode = c_n->dir_mode; n->file_mode = c_n->file_mode; n->gid = c_n->gid; n->uid = c_n->uid; n->retry_count = c_n->retry_count; n->time_out = c_n->time_out; n->ncp_fd = c_n->ncp_fd; n->wdog_pid = c_n->wdog_pid; n->mounted_uid = c_n->mounted_uid; n->flags = c_n->flags; } else if (version != 5) { return NULL; } return raw_data; } |
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struct compat_nfs_string { compat_uint_t len; |
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compat_uptr_t data; |
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}; 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; |
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compat_uptr_t host_addr; |
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compat_int_t proto; compat_int_t auth_flavourlen; |
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compat_uptr_t auth_flavours; |
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}; 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; } |
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return 0; } |
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#define NCPFS_NAME "ncpfs" |
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#define NFS4_NAME "nfs4" |
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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) |
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{ |
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char *kernel_type; |
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void *options; |
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char *kernel_dev; |
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int retval; |
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kernel_type = copy_mount_string(type); retval = PTR_ERR(kernel_type); if (IS_ERR(kernel_type)) |
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goto out; |
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kernel_dev = copy_mount_string(dev_name); retval = PTR_ERR(kernel_dev); if (IS_ERR(kernel_dev)) |
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goto out1; |
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options = copy_mount_options(data); retval = PTR_ERR(options); if (IS_ERR(options)) |
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goto out2; |
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if (kernel_type && options) { |
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if (!strcmp(kernel_type, NCPFS_NAME)) { |
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do_ncp_super_data_conv(options); |
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} else if (!strcmp(kernel_type, NFS4_NAME)) { |
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retval = -EINVAL; if (do_nfs4_super_data_conv(options)) |
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goto out3; |
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} } |
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retval = do_mount(kernel_dev, dir_name, kernel_type, flags, options); |
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out3: |
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kfree(options); |
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out2: |
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kfree(kernel_dev); |
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out1: |
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kfree(kernel_type); |
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out: return retval; } |