2019-12-12 14:09:14 +00:00
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// SPDX-License-Identifier: MIT
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/*
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* VirtualBox Guest Shared Folders support: Virtual File System.
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*
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* Module initialization/finalization
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* File system registration/deregistration
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* Superblock reading
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* Few utility functions
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*
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* Copyright (C) 2006-2018 Oracle Corporation
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*/
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#include <linux/idr.h>
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#include <linux/fs_parser.h>
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#include <linux/magic.h>
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#include <linux/module.h>
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#include <linux/nls.h>
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#include <linux/statfs.h>
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#include <linux/vbox_utils.h>
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#include "vfsmod.h"
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#define VBOXSF_SUPER_MAGIC 0x786f4256 /* 'VBox' little endian */
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2021-09-27 18:26:21 +00:00
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static const unsigned char VBSF_MOUNT_SIGNATURE[4] = "\000\377\376\375";
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2019-12-12 14:09:14 +00:00
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static int follow_symlinks;
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module_param(follow_symlinks, int, 0444);
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MODULE_PARM_DESC(follow_symlinks,
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"Let host resolve symlinks rather than showing them");
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static DEFINE_IDA(vboxsf_bdi_ida);
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static DEFINE_MUTEX(vboxsf_setup_mutex);
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static bool vboxsf_setup_done;
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static struct super_operations vboxsf_super_ops; /* forward declaration */
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static struct kmem_cache *vboxsf_inode_cachep;
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static char * const vboxsf_default_nls = CONFIG_NLS_DEFAULT;
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enum { opt_nls, opt_uid, opt_gid, opt_ttl, opt_dmode, opt_fmode,
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opt_dmask, opt_fmask };
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static const struct fs_parameter_spec vboxsf_fs_parameters[] = {
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fsparam_string ("nls", opt_nls),
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fsparam_u32 ("uid", opt_uid),
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fsparam_u32 ("gid", opt_gid),
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fsparam_u32 ("ttl", opt_ttl),
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fsparam_u32oct ("dmode", opt_dmode),
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fsparam_u32oct ("fmode", opt_fmode),
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fsparam_u32oct ("dmask", opt_dmask),
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fsparam_u32oct ("fmask", opt_fmask),
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{}
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};
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static int vboxsf_parse_param(struct fs_context *fc, struct fs_parameter *param)
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{
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struct vboxsf_fs_context *ctx = fc->fs_private;
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struct fs_parse_result result;
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kuid_t uid;
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kgid_t gid;
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int opt;
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opt = fs_parse(fc, vboxsf_fs_parameters, param, &result);
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if (opt < 0)
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return opt;
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switch (opt) {
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case opt_nls:
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if (ctx->nls_name || fc->purpose != FS_CONTEXT_FOR_MOUNT) {
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vbg_err("vboxsf: Cannot reconfigure nls option\n");
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return -EINVAL;
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}
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ctx->nls_name = param->string;
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param->string = NULL;
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break;
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case opt_uid:
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uid = make_kuid(current_user_ns(), result.uint_32);
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if (!uid_valid(uid))
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return -EINVAL;
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ctx->o.uid = uid;
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break;
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case opt_gid:
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gid = make_kgid(current_user_ns(), result.uint_32);
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if (!gid_valid(gid))
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return -EINVAL;
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ctx->o.gid = gid;
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break;
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case opt_ttl:
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ctx->o.ttl = msecs_to_jiffies(result.uint_32);
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break;
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case opt_dmode:
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if (result.uint_32 & ~0777)
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return -EINVAL;
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ctx->o.dmode = result.uint_32;
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ctx->o.dmode_set = true;
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break;
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case opt_fmode:
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if (result.uint_32 & ~0777)
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return -EINVAL;
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ctx->o.fmode = result.uint_32;
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ctx->o.fmode_set = true;
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break;
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case opt_dmask:
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if (result.uint_32 & ~07777)
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return -EINVAL;
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ctx->o.dmask = result.uint_32;
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break;
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case opt_fmask:
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if (result.uint_32 & ~07777)
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return -EINVAL;
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ctx->o.fmask = result.uint_32;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int vboxsf_fill_super(struct super_block *sb, struct fs_context *fc)
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{
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struct vboxsf_fs_context *ctx = fc->fs_private;
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struct shfl_string *folder_name, root_path;
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struct vboxsf_sbi *sbi;
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struct dentry *droot;
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struct inode *iroot;
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char *nls_name;
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size_t size;
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int err;
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if (!fc->source)
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return -EINVAL;
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sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
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if (!sbi)
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return -ENOMEM;
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sbi->o = ctx->o;
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idr_init(&sbi->ino_idr);
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spin_lock_init(&sbi->ino_idr_lock);
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sbi->next_generation = 1;
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sbi->bdi_id = -1;
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/* Load nls if not utf8 */
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nls_name = ctx->nls_name ? ctx->nls_name : vboxsf_default_nls;
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if (strcmp(nls_name, "utf8") != 0) {
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if (nls_name == vboxsf_default_nls)
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sbi->nls = load_nls_default();
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else
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sbi->nls = load_nls(nls_name);
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if (!sbi->nls) {
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vbg_err("vboxsf: Count not load '%s' nls\n", nls_name);
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err = -EINVAL;
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goto fail_free;
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}
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}
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sbi->bdi_id = ida_simple_get(&vboxsf_bdi_ida, 0, 0, GFP_KERNEL);
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if (sbi->bdi_id < 0) {
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err = sbi->bdi_id;
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goto fail_free;
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}
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2020-05-04 12:47:53 +00:00
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err = super_setup_bdi_name(sb, "vboxsf-%d", sbi->bdi_id);
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2019-12-12 14:09:14 +00:00
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if (err)
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goto fail_free;
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2020-09-24 06:51:32 +00:00
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sb->s_bdi->ra_pages = 0;
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sb->s_bdi->io_pages = 0;
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2019-12-12 14:09:14 +00:00
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/* Turn source into a shfl_string and map the folder */
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size = strlen(fc->source) + 1;
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folder_name = kmalloc(SHFLSTRING_HEADER_SIZE + size, GFP_KERNEL);
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if (!folder_name) {
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err = -ENOMEM;
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goto fail_free;
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}
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folder_name->size = size;
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folder_name->length = size - 1;
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strlcpy(folder_name->string.utf8, fc->source, size);
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err = vboxsf_map_folder(folder_name, &sbi->root);
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kfree(folder_name);
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if (err) {
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vbg_err("vboxsf: Host rejected mount of '%s' with error %d\n",
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fc->source, err);
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goto fail_free;
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}
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root_path.length = 1;
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root_path.size = 2;
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root_path.string.utf8[0] = '/';
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root_path.string.utf8[1] = 0;
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err = vboxsf_stat(sbi, &root_path, &sbi->root_info);
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if (err)
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goto fail_unmap;
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sb->s_magic = VBOXSF_SUPER_MAGIC;
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sb->s_blocksize = 1024;
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sb->s_maxbytes = MAX_LFS_FILESIZE;
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sb->s_op = &vboxsf_super_ops;
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sb->s_d_op = &vboxsf_dentry_ops;
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iroot = iget_locked(sb, 0);
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if (!iroot) {
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err = -ENOMEM;
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goto fail_unmap;
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}
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2021-02-14 05:12:23 +00:00
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vboxsf_init_inode(sbi, iroot, &sbi->root_info, false);
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2019-12-12 14:09:14 +00:00
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unlock_new_inode(iroot);
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droot = d_make_root(iroot);
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if (!droot) {
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err = -ENOMEM;
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goto fail_unmap;
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}
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sb->s_root = droot;
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sb->s_fs_info = sbi;
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return 0;
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fail_unmap:
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vboxsf_unmap_folder(sbi->root);
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fail_free:
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if (sbi->bdi_id >= 0)
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ida_simple_remove(&vboxsf_bdi_ida, sbi->bdi_id);
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if (sbi->nls)
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unload_nls(sbi->nls);
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idr_destroy(&sbi->ino_idr);
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kfree(sbi);
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return err;
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}
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static void vboxsf_inode_init_once(void *data)
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{
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struct vboxsf_inode *sf_i = data;
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mutex_init(&sf_i->handle_list_mutex);
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inode_init_once(&sf_i->vfs_inode);
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}
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static struct inode *vboxsf_alloc_inode(struct super_block *sb)
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{
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struct vboxsf_inode *sf_i;
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2022-03-22 21:41:03 +00:00
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sf_i = alloc_inode_sb(sb, vboxsf_inode_cachep, GFP_NOFS);
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2019-12-12 14:09:14 +00:00
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if (!sf_i)
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return NULL;
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sf_i->force_restat = 0;
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INIT_LIST_HEAD(&sf_i->handle_list);
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return &sf_i->vfs_inode;
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}
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static void vboxsf_free_inode(struct inode *inode)
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{
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struct vboxsf_sbi *sbi = VBOXSF_SBI(inode->i_sb);
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unsigned long flags;
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spin_lock_irqsave(&sbi->ino_idr_lock, flags);
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idr_remove(&sbi->ino_idr, inode->i_ino);
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spin_unlock_irqrestore(&sbi->ino_idr_lock, flags);
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kmem_cache_free(vboxsf_inode_cachep, VBOXSF_I(inode));
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}
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static void vboxsf_put_super(struct super_block *sb)
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{
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struct vboxsf_sbi *sbi = VBOXSF_SBI(sb);
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vboxsf_unmap_folder(sbi->root);
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if (sbi->bdi_id >= 0)
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ida_simple_remove(&vboxsf_bdi_ida, sbi->bdi_id);
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if (sbi->nls)
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unload_nls(sbi->nls);
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/*
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* vboxsf_free_inode uses the idr, make sure all delayed rcu free
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* inodes are flushed.
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*/
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rcu_barrier();
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idr_destroy(&sbi->ino_idr);
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kfree(sbi);
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}
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static int vboxsf_statfs(struct dentry *dentry, struct kstatfs *stat)
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{
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struct super_block *sb = dentry->d_sb;
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struct shfl_volinfo shfl_volinfo;
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struct vboxsf_sbi *sbi;
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u32 buf_len;
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int err;
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sbi = VBOXSF_SBI(sb);
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buf_len = sizeof(shfl_volinfo);
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err = vboxsf_fsinfo(sbi->root, 0, SHFL_INFO_GET | SHFL_INFO_VOLUME,
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&buf_len, &shfl_volinfo);
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if (err)
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return err;
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stat->f_type = VBOXSF_SUPER_MAGIC;
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stat->f_bsize = shfl_volinfo.bytes_per_allocation_unit;
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do_div(shfl_volinfo.total_allocation_bytes,
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shfl_volinfo.bytes_per_allocation_unit);
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stat->f_blocks = shfl_volinfo.total_allocation_bytes;
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do_div(shfl_volinfo.available_allocation_bytes,
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shfl_volinfo.bytes_per_allocation_unit);
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stat->f_bfree = shfl_volinfo.available_allocation_bytes;
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stat->f_bavail = shfl_volinfo.available_allocation_bytes;
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stat->f_files = 1000;
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/*
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* Don't return 0 here since the guest may then think that it is not
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* possible to create any more files.
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*/
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stat->f_ffree = 1000000;
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stat->f_fsid.val[0] = 0;
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stat->f_fsid.val[1] = 0;
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stat->f_namelen = 255;
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return 0;
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}
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static struct super_operations vboxsf_super_ops = {
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.alloc_inode = vboxsf_alloc_inode,
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.free_inode = vboxsf_free_inode,
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.put_super = vboxsf_put_super,
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.statfs = vboxsf_statfs,
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};
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static int vboxsf_setup(void)
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{
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int err;
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mutex_lock(&vboxsf_setup_mutex);
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if (vboxsf_setup_done)
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goto success;
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vboxsf_inode_cachep =
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kmem_cache_create("vboxsf_inode_cache",
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sizeof(struct vboxsf_inode), 0,
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(SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD |
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SLAB_ACCOUNT),
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vboxsf_inode_init_once);
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if (!vboxsf_inode_cachep) {
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err = -ENOMEM;
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goto fail_nomem;
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}
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err = vboxsf_connect();
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if (err) {
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vbg_err("vboxsf: err %d connecting to guest PCI-device\n", err);
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vbg_err("vboxsf: make sure you are inside a VirtualBox VM\n");
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vbg_err("vboxsf: and check dmesg for vboxguest errors\n");
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goto fail_free_cache;
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}
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|
|
|
|
|
|
err = vboxsf_set_utf8();
|
|
|
|
if (err) {
|
|
|
|
vbg_err("vboxsf_setutf8 error %d\n", err);
|
|
|
|
goto fail_disconnect;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!follow_symlinks) {
|
|
|
|
err = vboxsf_set_symlinks();
|
|
|
|
if (err)
|
|
|
|
vbg_warn("vboxsf: Unable to show symlinks: %d\n", err);
|
|
|
|
}
|
|
|
|
|
|
|
|
vboxsf_setup_done = true;
|
|
|
|
success:
|
|
|
|
mutex_unlock(&vboxsf_setup_mutex);
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
fail_disconnect:
|
|
|
|
vboxsf_disconnect();
|
|
|
|
fail_free_cache:
|
|
|
|
kmem_cache_destroy(vboxsf_inode_cachep);
|
|
|
|
fail_nomem:
|
|
|
|
mutex_unlock(&vboxsf_setup_mutex);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int vboxsf_parse_monolithic(struct fs_context *fc, void *data)
|
|
|
|
{
|
2021-09-27 18:26:21 +00:00
|
|
|
if (data && !memcmp(data, VBSF_MOUNT_SIGNATURE, 4)) {
|
2019-12-12 14:09:14 +00:00
|
|
|
vbg_err("vboxsf: Old binary mount data not supported, remove obsolete mount.vboxsf and/or update your VBoxService.\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
return generic_parse_monolithic(fc, data);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int vboxsf_get_tree(struct fs_context *fc)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
|
|
|
|
err = vboxsf_setup();
|
|
|
|
if (err)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
return get_tree_nodev(fc, vboxsf_fill_super);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int vboxsf_reconfigure(struct fs_context *fc)
|
|
|
|
{
|
|
|
|
struct vboxsf_sbi *sbi = VBOXSF_SBI(fc->root->d_sb);
|
|
|
|
struct vboxsf_fs_context *ctx = fc->fs_private;
|
|
|
|
struct inode *iroot = fc->root->d_sb->s_root->d_inode;
|
|
|
|
|
|
|
|
/* Apply changed options to the root inode */
|
|
|
|
sbi->o = ctx->o;
|
2021-02-14 05:12:23 +00:00
|
|
|
vboxsf_init_inode(sbi, iroot, &sbi->root_info, true);
|
2019-12-12 14:09:14 +00:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void vboxsf_free_fc(struct fs_context *fc)
|
|
|
|
{
|
|
|
|
struct vboxsf_fs_context *ctx = fc->fs_private;
|
|
|
|
|
|
|
|
kfree(ctx->nls_name);
|
|
|
|
kfree(ctx);
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct fs_context_operations vboxsf_context_ops = {
|
|
|
|
.free = vboxsf_free_fc,
|
|
|
|
.parse_param = vboxsf_parse_param,
|
|
|
|
.parse_monolithic = vboxsf_parse_monolithic,
|
|
|
|
.get_tree = vboxsf_get_tree,
|
|
|
|
.reconfigure = vboxsf_reconfigure,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int vboxsf_init_fs_context(struct fs_context *fc)
|
|
|
|
{
|
|
|
|
struct vboxsf_fs_context *ctx;
|
|
|
|
|
|
|
|
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
|
|
|
|
if (!ctx)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
current_uid_gid(&ctx->o.uid, &ctx->o.gid);
|
|
|
|
|
|
|
|
fc->fs_private = ctx;
|
|
|
|
fc->ops = &vboxsf_context_ops;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct file_system_type vboxsf_fs_type = {
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.name = "vboxsf",
|
|
|
|
.init_fs_context = vboxsf_init_fs_context,
|
|
|
|
.kill_sb = kill_anon_super
|
|
|
|
};
|
|
|
|
|
|
|
|
/* Module initialization/finalization handlers */
|
|
|
|
static int __init vboxsf_init(void)
|
|
|
|
{
|
|
|
|
return register_filesystem(&vboxsf_fs_type);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit vboxsf_fini(void)
|
|
|
|
{
|
|
|
|
unregister_filesystem(&vboxsf_fs_type);
|
|
|
|
|
|
|
|
mutex_lock(&vboxsf_setup_mutex);
|
|
|
|
if (vboxsf_setup_done) {
|
|
|
|
vboxsf_disconnect();
|
|
|
|
/*
|
|
|
|
* Make sure all delayed rcu free inodes are flushed
|
|
|
|
* before we destroy the cache.
|
|
|
|
*/
|
|
|
|
rcu_barrier();
|
|
|
|
kmem_cache_destroy(vboxsf_inode_cachep);
|
|
|
|
}
|
|
|
|
mutex_unlock(&vboxsf_setup_mutex);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(vboxsf_init);
|
|
|
|
module_exit(vboxsf_fini);
|
|
|
|
|
|
|
|
MODULE_DESCRIPTION("Oracle VM VirtualBox Module for Host File System Access");
|
|
|
|
MODULE_AUTHOR("Oracle Corporation");
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
MODULE_ALIAS_FS("vboxsf");
|