struct inode *inode = entry->d_inode;
struct fuse_inode *fi = get_fuse_inode(inode);
struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_req *req = fuse_get_request_nonint(fc);
+ struct fuse_req *req = fuse_get_request(fc);
if (!req)
return 0;
fuse_lookup_init(req, entry->d_parent->d_inode, entry, &outarg);
- request_send_nonint(fc, req);
+ request_send(fc, req);
err = req->out.h.error;
if (!err) {
if (outarg.nodeid != get_node_id(inode)) {
req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
fuse_lookup_init(req, dir, entry, &outarg);
request_send(fc, req);
struct fuse_conn *fc = get_fuse_conn(dir);
struct fuse_req *req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
memset(&inarg, 0, sizeof(inarg));
inarg.mode = mode;
struct fuse_conn *fc = get_fuse_conn(dir);
struct fuse_req *req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
memset(&inarg, 0, sizeof(inarg));
inarg.mode = mode;
req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
req->in.h.opcode = FUSE_SYMLINK;
req->in.numargs = 2;
struct fuse_conn *fc = get_fuse_conn(dir);
struct fuse_req *req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
req->in.h.opcode = FUSE_UNLINK;
req->in.h.nodeid = get_node_id(dir);
struct fuse_conn *fc = get_fuse_conn(dir);
struct fuse_req *req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
req->in.h.opcode = FUSE_RMDIR;
req->in.h.nodeid = get_node_id(dir);
struct fuse_conn *fc = get_fuse_conn(olddir);
struct fuse_req *req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
memset(&inarg, 0, sizeof(inarg));
inarg.newdir = get_node_id(newdir);
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
memset(&inarg, 0, sizeof(inarg));
inarg.oldnodeid = get_node_id(inode);
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
req->in.h.opcode = FUSE_GETATTR;
req->in.h.nodeid = get_node_id(inode);
return err;
}
+/*
+ * Calling into a user-controlled filesystem gives the filesystem
+ * daemon ptrace-like capabilities over the requester process. This
+ * means, that the filesystem daemon is able to record the exact
+ * filesystem operations performed, and can also control the behavior
+ * of the requester process in otherwise impossible ways. For example
+ * it can delay the operation for arbitrary length of time allowing
+ * DoS against the requester.
+ *
+ * For this reason only those processes can call into the filesystem,
+ * for which the owner of the mount has ptrace privilege. This
+ * excludes processes started by other users, suid or sgid processes.
+ */
+static int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task)
+{
+ if (fc->flags & FUSE_ALLOW_OTHER)
+ return 1;
+
+ if (task->euid == fc->user_id &&
+ task->suid == fc->user_id &&
+ task->uid == fc->user_id &&
+ task->egid == fc->group_id &&
+ task->sgid == fc->group_id &&
+ task->gid == fc->group_id)
+ return 1;
+
+ return 0;
+}
+
static int fuse_revalidate(struct dentry *entry)
{
struct inode *inode = entry->d_inode;
struct fuse_inode *fi = get_fuse_inode(inode);
struct fuse_conn *fc = get_fuse_conn(inode);
- if (get_node_id(inode) == FUSE_ROOT_ID) {
- if (!(fc->flags & FUSE_ALLOW_OTHER) &&
- current->fsuid != fc->user_id)
- return -EACCES;
- } else if (time_before_eq(jiffies, fi->i_time))
+ if (!fuse_allow_task(fc, current))
+ return -EACCES;
+ if (get_node_id(inode) != FUSE_ROOT_ID &&
+ time_before_eq(jiffies, fi->i_time))
return 0;
return fuse_do_getattr(inode);
{
struct fuse_conn *fc = get_fuse_conn(inode);
- if (!(fc->flags & FUSE_ALLOW_OTHER) && current->fsuid != fc->user_id)
+ if (!fuse_allow_task(fc, current))
return -EACCES;
else if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
int err = generic_permission(inode, mask, NULL);
return 0;
}
-static int fuse_checkdir(struct file *cfile, struct file *file)
+static inline size_t fuse_send_readdir(struct fuse_req *req, struct file *file,
+ struct inode *inode, loff_t pos,
+ size_t count)
{
- struct inode *inode;
- if (!cfile)
- return -EIO;
- inode = cfile->f_dentry->d_inode;
- if (!S_ISREG(inode->i_mode)) {
- fput(cfile);
- return -EIO;
- }
-
- file->private_data = cfile;
- return 0;
+ return fuse_send_read_common(req, file, inode, pos, count, 1);
}
-static int fuse_getdir(struct file *file)
+static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
{
+ int err;
+ size_t nbytes;
+ struct page *page;
struct inode *inode = file->f_dentry->d_inode;
struct fuse_conn *fc = get_fuse_conn(inode);
struct fuse_req *req = fuse_get_request(fc);
- struct fuse_getdir_out_i outarg;
- int err;
-
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
- req->in.h.opcode = FUSE_GETDIR;
- req->in.h.nodeid = get_node_id(inode);
- req->inode = inode;
- req->out.numargs = 1;
- req->out.args[0].size = sizeof(struct fuse_getdir_out);
- req->out.args[0].value = &outarg;
- request_send(fc, req);
+ page = alloc_page(GFP_KERNEL);
+ if (!page) {
+ fuse_put_request(fc, req);
+ return -ENOMEM;
+ }
+ req->num_pages = 1;
+ req->pages[0] = page;
+ nbytes = fuse_send_readdir(req, file, inode, file->f_pos, PAGE_SIZE);
err = req->out.h.error;
fuse_put_request(fc, req);
if (!err)
- err = fuse_checkdir(outarg.file, file);
- return err;
-}
-
-static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
-{
- struct file *cfile = file->private_data;
- char *buf;
- int ret;
-
- if (!cfile) {
- ret = fuse_getdir(file);
- if (ret)
- return ret;
-
- cfile = file->private_data;
- }
-
- buf = (char *) __get_free_page(GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
+ err = parse_dirfile(page_address(page), nbytes, file, dstbuf,
+ filldir);
- ret = kernel_read(cfile, file->f_pos, buf, PAGE_SIZE);
- if (ret > 0)
- ret = parse_dirfile(buf, ret, file, dstbuf, filldir);
-
- free_page((unsigned long) buf);
- return ret;
+ __free_page(page);
+ fuse_invalidate_attr(inode); /* atime changed */
+ return err;
}
static char *read_link(struct dentry *dentry)
char *link;
if (!req)
- return ERR_PTR(-ERESTARTNOINTR);
+ return ERR_PTR(-EINTR);
link = (char *) __get_free_page(GFP_KERNEL);
if (!link) {
link[req->out.args[0].size] = '\0';
out:
fuse_put_request(fc, req);
+ fuse_invalidate_attr(inode); /* atime changed */
return link;
}
static int fuse_dir_open(struct inode *inode, struct file *file)
{
- file->private_data = NULL;
- return 0;
+ return fuse_open_common(inode, file, 1);
}
static int fuse_dir_release(struct inode *inode, struct file *file)
{
- struct file *cfile = file->private_data;
-
- if (cfile)
- fput(cfile);
+ return fuse_release_common(inode, file, 1);
+}
- return 0;
+static int fuse_dir_fsync(struct file *file, struct dentry *de, int datasync)
+{
+ /* nfsd can call this with no file */
+ return file ? fuse_fsync_common(file, de, datasync, 1) : 0;
}
static unsigned iattr_to_fattr(struct iattr *iattr, struct fuse_attr *fattr)
req = fuse_get_request(fc);
if (!req)
- return -ERESTARTNOINTR;
+ return -EINTR;
memset(&inarg, 0, sizeof(inarg));
inarg.valid = iattr_to_fattr(attr, &inarg.attr);
return d_splice_alias(inode, entry);
}
+static int fuse_setxattr(struct dentry *entry, const char *name,
+ const void *value, size_t size, int flags)
+{
+ struct inode *inode = entry->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req;
+ struct fuse_setxattr_in inarg;
+ int err;
+
+ if (size > FUSE_XATTR_SIZE_MAX)
+ return -E2BIG;
+
+ if (fc->no_setxattr)
+ return -EOPNOTSUPP;
+
+ req = fuse_get_request(fc);
+ if (!req)
+ return -EINTR;
+
+ memset(&inarg, 0, sizeof(inarg));
+ inarg.size = size;
+ inarg.flags = flags;
+ req->in.h.opcode = FUSE_SETXATTR;
+ req->in.h.nodeid = get_node_id(inode);
+ req->inode = inode;
+ req->in.numargs = 3;
+ req->in.args[0].size = sizeof(inarg);
+ req->in.args[0].value = &inarg;
+ req->in.args[1].size = strlen(name) + 1;
+ req->in.args[1].value = name;
+ req->in.args[2].size = size;
+ req->in.args[2].value = value;
+ request_send(fc, req);
+ err = req->out.h.error;
+ fuse_put_request(fc, req);
+ if (err == -ENOSYS) {
+ fc->no_setxattr = 1;
+ err = -EOPNOTSUPP;
+ }
+ return err;
+}
+
+static ssize_t fuse_getxattr(struct dentry *entry, const char *name,
+ void *value, size_t size)
+{
+ struct inode *inode = entry->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req;
+ struct fuse_getxattr_in inarg;
+ struct fuse_getxattr_out outarg;
+ ssize_t ret;
+
+ if (fc->no_getxattr)
+ return -EOPNOTSUPP;
+
+ req = fuse_get_request(fc);
+ if (!req)
+ return -EINTR;
+
+ memset(&inarg, 0, sizeof(inarg));
+ inarg.size = size;
+ req->in.h.opcode = FUSE_GETXATTR;
+ req->in.h.nodeid = get_node_id(inode);
+ req->inode = inode;
+ req->in.numargs = 2;
+ req->in.args[0].size = sizeof(inarg);
+ req->in.args[0].value = &inarg;
+ req->in.args[1].size = strlen(name) + 1;
+ req->in.args[1].value = name;
+ /* This is really two different operations rolled into one */
+ req->out.numargs = 1;
+ if (size) {
+ req->out.argvar = 1;
+ req->out.args[0].size = size;
+ req->out.args[0].value = value;
+ } else {
+ req->out.args[0].size = sizeof(outarg);
+ req->out.args[0].value = &outarg;
+ }
+ request_send(fc, req);
+ ret = req->out.h.error;
+ if (!ret)
+ ret = size ? req->out.args[0].size : outarg.size;
+ else {
+ if (ret == -ENOSYS) {
+ fc->no_getxattr = 1;
+ ret = -EOPNOTSUPP;
+ }
+ }
+ fuse_put_request(fc, req);
+ return ret;
+}
+
+static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
+{
+ struct inode *inode = entry->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req;
+ struct fuse_getxattr_in inarg;
+ struct fuse_getxattr_out outarg;
+ ssize_t ret;
+
+ if (fc->no_listxattr)
+ return -EOPNOTSUPP;
+
+ req = fuse_get_request(fc);
+ if (!req)
+ return -EINTR;
+
+ memset(&inarg, 0, sizeof(inarg));
+ inarg.size = size;
+ req->in.h.opcode = FUSE_LISTXATTR;
+ req->in.h.nodeid = get_node_id(inode);
+ req->inode = inode;
+ req->in.numargs = 1;
+ req->in.args[0].size = sizeof(inarg);
+ req->in.args[0].value = &inarg;
+ /* This is really two different operations rolled into one */
+ req->out.numargs = 1;
+ if (size) {
+ req->out.argvar = 1;
+ req->out.args[0].size = size;
+ req->out.args[0].value = list;
+ } else {
+ req->out.args[0].size = sizeof(outarg);
+ req->out.args[0].value = &outarg;
+ }
+ request_send(fc, req);
+ ret = req->out.h.error;
+ if (!ret)
+ ret = size ? req->out.args[0].size : outarg.size;
+ else {
+ if (ret == -ENOSYS) {
+ fc->no_listxattr = 1;
+ ret = -EOPNOTSUPP;
+ }
+ }
+ fuse_put_request(fc, req);
+ return ret;
+}
+
+static int fuse_removexattr(struct dentry *entry, const char *name)
+{
+ struct inode *inode = entry->d_inode;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_req *req;
+ int err;
+
+ if (fc->no_removexattr)
+ return -EOPNOTSUPP;
+
+ req = fuse_get_request(fc);
+ if (!req)
+ return -EINTR;
+
+ req->in.h.opcode = FUSE_REMOVEXATTR;
+ req->in.h.nodeid = get_node_id(inode);
+ req->inode = inode;
+ req->in.numargs = 1;
+ req->in.args[0].size = strlen(name) + 1;
+ req->in.args[0].value = name;
+ request_send(fc, req);
+ err = req->out.h.error;
+ fuse_put_request(fc, req);
+ if (err == -ENOSYS) {
+ fc->no_removexattr = 1;
+ err = -EOPNOTSUPP;
+ }
+ return err;
+}
+
static struct inode_operations fuse_dir_inode_operations = {
.lookup = fuse_lookup,
.mkdir = fuse_mkdir,
.mknod = fuse_mknod,
.permission = fuse_permission,
.getattr = fuse_getattr,
+ .setxattr = fuse_setxattr,
+ .getxattr = fuse_getxattr,
+ .listxattr = fuse_listxattr,
+ .removexattr = fuse_removexattr,
};
static struct file_operations fuse_dir_operations = {
.readdir = fuse_readdir,
.open = fuse_dir_open,
.release = fuse_dir_release,
+ .fsync = fuse_dir_fsync,
};
static struct inode_operations fuse_common_inode_operations = {
.setattr = fuse_setattr,
.permission = fuse_permission,
.getattr = fuse_getattr,
+ .setxattr = fuse_setxattr,
+ .getxattr = fuse_getxattr,
+ .listxattr = fuse_listxattr,
+ .removexattr = fuse_removexattr,
};
static struct inode_operations fuse_symlink_inode_operations = {
.put_link = fuse_put_link,
.readlink = generic_readlink,
.getattr = fuse_getattr,
+ .setxattr = fuse_setxattr,
+ .getxattr = fuse_getxattr,
+ .listxattr = fuse_listxattr,
+ .removexattr = fuse_removexattr,
};
void fuse_init_common(struct inode *inode)
projects / linux-2.6 / blobdiff