예제 #1
0
/*
 * Set the pipe fd for kernel communication to the daemon.
 *
 * Normally this is set at mount using an option but if we
 * are reconnecting to a busy mount then we need to use this
 * to tell the autofs mount about the new kernel pipe fd. In
 * order to protect mounts against incorrectly setting the
 * pipefd we also require that the autofs mount be catatonic.
 *
 * This also sets the process group id used to identify the
 * controlling process (eg. the owning automount(8) daemon).
 */
static int autofs_dev_ioctl_setpipefd(struct file *fp,
				      struct autofs_sb_info *sbi,
				      struct autofs_dev_ioctl *param)
{
	int pipefd;
	int err = 0;

	if (param->setpipefd.pipefd == -1)
		return -EINVAL;

	pipefd = param->setpipefd.pipefd;

	mutex_lock(&sbi->wq_mutex);
	if (!sbi->catatonic) {
		mutex_unlock(&sbi->wq_mutex);
		return -EBUSY;
	} else {
		struct file *pipe = fget(pipefd);
<<<<<<< HEAD
		if (!pipe) {
			err = -EBADF;
			goto out;
		}
		if (autofs_prepare_pipe(pipe) < 0) {
=======
		if (!pipe->f_op || !pipe->f_op->write) {
>>>>>>> 296c66da8a02d52243f45b80521febece5ed498a
			err = -EPIPE;
			fput(pipe);
			goto out;
		}
예제 #2
0
파일: dev-ioctl.c 프로젝트: mdamt/linux
/*
 * Set the pipe fd for kernel communication to the daemon.
 *
 * Normally this is set at mount using an option but if we
 * are reconnecting to a busy mount then we need to use this
 * to tell the autofs mount about the new kernel pipe fd. In
 * order to protect mounts against incorrectly setting the
 * pipefd we also require that the autofs mount be catatonic.
 *
 * This also sets the process group id used to identify the
 * controlling process (eg. the owning automount(8) daemon).
 */
static int autofs_dev_ioctl_setpipefd(struct file *fp,
				      struct autofs_sb_info *sbi,
				      struct autofs_dev_ioctl *param)
{
	int pipefd;
	int err = 0;
	struct pid *new_pid = NULL;

	if (param->setpipefd.pipefd == -1)
		return -EINVAL;

	pipefd = param->setpipefd.pipefd;

	mutex_lock(&sbi->wq_mutex);
	if (!sbi->catatonic) {
		mutex_unlock(&sbi->wq_mutex);
		return -EBUSY;
	} else {
		struct file *pipe;

		new_pid = get_task_pid(current, PIDTYPE_PGID);

		if (ns_of_pid(new_pid) != ns_of_pid(sbi->oz_pgrp)) {
			pr_warn("not allowed to change PID namespace\n");
			err = -EINVAL;
			goto out;
		}

		pipe = fget(pipefd);
		if (!pipe) {
			err = -EBADF;
			goto out;
		}
		if (autofs_prepare_pipe(pipe) < 0) {
			err = -EPIPE;
			fput(pipe);
			goto out;
		}
		swap(sbi->oz_pgrp, new_pid);
		sbi->pipefd = pipefd;
		sbi->pipe = pipe;
		sbi->catatonic = 0;
	}
out:
	put_pid(new_pid);
	mutex_unlock(&sbi->wq_mutex);
	return err;
}
예제 #3
0
/*
 * Set the pipe fd for kernel communication to the daemon.
 *
 * Normally this is set at mount using an option but if we
 * are reconnecting to a busy mount then we need to use this
 * to tell the autofs mount about the new kernel pipe fd. In
 * order to protect mounts against incorrectly setting the
 * pipefd we also require that the autofs mount be catatonic.
 *
 * This also sets the process group id used to identify the
 * controlling process (eg. the owning automount(8) daemon).
 */
static int autofs_dev_ioctl_setpipefd(struct file *fp,
				      struct autofs_sb_info *sbi,
				      struct autofs_dev_ioctl *param)
{
	int pipefd;
	int err = 0;

	if (param->setpipefd.pipefd == -1)
		return -EINVAL;

	pipefd = param->setpipefd.pipefd;

	mutex_lock(&sbi->wq_mutex);
	if (!sbi->catatonic) {
		mutex_unlock(&sbi->wq_mutex);
		return -EBUSY;
	} else {
		struct file *pipe = fget(pipefd);
		if (!pipe) {
			err = -EBADF;
			goto out;
		}
		if (autofs_prepare_pipe(pipe) < 0) {
			err = -EPIPE;
			fput(pipe);
			goto out;
		}
		sbi->oz_pgrp = task_pgrp_nr(current);
		sbi->pipefd = pipefd;
		sbi->pipe = pipe;
		sbi->catatonic = 0;
	}
out:
	mutex_unlock(&sbi->wq_mutex);
	return err;
}
예제 #4
0
int autofs4_fill_super(struct super_block *s, void *data, int silent)
{
	struct inode * root_inode;
	struct dentry * root;
	struct file * pipe;
	int pipefd;
	struct autofs_sb_info *sbi;
	struct autofs_info *ino;

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
		goto fail_unlock;
	DPRINTK("starting up, sbi = %p",sbi);

	s->s_fs_info = sbi;
	sbi->magic = AUTOFS_SBI_MAGIC;
	sbi->pipefd = -1;
	sbi->pipe = NULL;
	sbi->catatonic = 1;
	sbi->exp_timeout = 0;
	sbi->oz_pgrp = task_pgrp_nr(current);
	sbi->sb = s;
	sbi->version = 0;
	sbi->sub_version = 0;
	set_autofs_type_indirect(&sbi->type);
	sbi->min_proto = 0;
	sbi->max_proto = 0;
	mutex_init(&sbi->wq_mutex);
	mutex_init(&sbi->pipe_mutex);
	spin_lock_init(&sbi->fs_lock);
	sbi->queues = NULL;
	spin_lock_init(&sbi->lookup_lock);
	INIT_LIST_HEAD(&sbi->active_list);
	INIT_LIST_HEAD(&sbi->expiring_list);
	s->s_blocksize = 1024;
	s->s_blocksize_bits = 10;
	s->s_magic = AUTOFS_SUPER_MAGIC;
	s->s_op = &autofs4_sops;
	s->s_d_op = &autofs4_dentry_operations;
	s->s_time_gran = 1;

	/*
	 * Get the root inode and dentry, but defer checking for errors.
	 */
	ino = autofs4_new_ino(sbi);
	if (!ino)
		goto fail_free;
	root_inode = autofs4_get_inode(s, S_IFDIR | 0755);
	root = d_make_root(root_inode);
	if (!root)
		goto fail_ino;
	pipe = NULL;

	root->d_fsdata = ino;

	/* Can this call block? */
	if (parse_options(data, &pipefd, &root_inode->i_uid, &root_inode->i_gid,
				&sbi->oz_pgrp, &sbi->type, &sbi->min_proto,
				&sbi->max_proto)) {
		printk("autofs: called with bogus options\n");
		goto fail_dput;
	}

	if (autofs_type_trigger(sbi->type))
		__managed_dentry_set_managed(root);

	root_inode->i_fop = &autofs4_root_operations;
	root_inode->i_op = &autofs4_dir_inode_operations;

	/* Couldn't this be tested earlier? */
	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
	    sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
		printk("autofs: kernel does not match daemon version "
		       "daemon (%d, %d) kernel (%d, %d)\n",
			sbi->min_proto, sbi->max_proto,
			AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
		goto fail_dput;
	}

	/* Establish highest kernel protocol version */
	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
		sbi->version = AUTOFS_MAX_PROTO_VERSION;
	else
		sbi->version = sbi->max_proto;
	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;

	DPRINTK("pipe fd = %d, pgrp = %u", pipefd, sbi->oz_pgrp);
	pipe = fget(pipefd);
	
	if (!pipe) {
		printk("autofs: could not open pipe file descriptor\n");
		goto fail_dput;
	}
	if (autofs_prepare_pipe(pipe) < 0)
		goto fail_fput;
	sbi->pipe = pipe;
	sbi->pipefd = pipefd;
	sbi->catatonic = 0;

	/*
	 * Success! Install the root dentry now to indicate completion.
	 */
	s->s_root = root;
	return 0;
	
	/*
	 * Failure ... clean up.
	 */
fail_fput:
	printk("autofs: pipe file descriptor does not contain proper ops\n");
	fput(pipe);
	/* fall through */
fail_dput:
	dput(root);
	goto fail_free;
fail_ino:
	kfree(ino);
fail_free:
	kfree(sbi);
	s->s_fs_info = NULL;
fail_unlock:
	return -EINVAL;
}
예제 #5
0
int autofs_fill_super(struct super_block *s, void *data, int silent)
{
	struct inode *root_inode;
	struct dentry *root;
	struct file *pipe;
	struct autofs_sb_info *sbi;
	struct autofs_info *ino;
	int pgrp = 0;
	bool pgrp_set = false;
	int ret = -EINVAL;

	sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
	if (!sbi)
		return -ENOMEM;
	pr_debug("starting up, sbi = %p\n", sbi);

	s->s_fs_info = sbi;
	sbi->magic = AUTOFS_SBI_MAGIC;
	sbi->pipefd = -1;
	sbi->pipe = NULL;
	sbi->exp_timeout = 0;
	sbi->oz_pgrp = NULL;
	sbi->sb = s;
	sbi->version = 0;
	sbi->sub_version = 0;
	sbi->flags = AUTOFS_SBI_CATATONIC;
	set_autofs_type_indirect(&sbi->type);
	sbi->min_proto = 0;
	sbi->max_proto = 0;
	mutex_init(&sbi->wq_mutex);
	mutex_init(&sbi->pipe_mutex);
	spin_lock_init(&sbi->fs_lock);
	sbi->queues = NULL;
	spin_lock_init(&sbi->lookup_lock);
	INIT_LIST_HEAD(&sbi->active_list);
	INIT_LIST_HEAD(&sbi->expiring_list);
	s->s_blocksize = 1024;
	s->s_blocksize_bits = 10;
	s->s_magic = AUTOFS_SUPER_MAGIC;
	s->s_op = &autofs_sops;
	s->s_d_op = &autofs_dentry_operations;
	s->s_time_gran = 1;

	/*
	 * Get the root inode and dentry, but defer checking for errors.
	 */
	ino = autofs_new_ino(sbi);
	if (!ino) {
		ret = -ENOMEM;
		goto fail_free;
	}
	root_inode = autofs_get_inode(s, S_IFDIR | 0755);
	root = d_make_root(root_inode);
	if (!root)
		goto fail_ino;
	pipe = NULL;

	root->d_fsdata = ino;

	/* Can this call block? */
	if (parse_options(data, root_inode, &pgrp, &pgrp_set, sbi)) {
		pr_err("called with bogus options\n");
		goto fail_dput;
	}

	/* Test versions first */
	if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
	    sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
		pr_err("kernel does not match daemon version "
		       "daemon (%d, %d) kernel (%d, %d)\n",
		       sbi->min_proto, sbi->max_proto,
		       AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
		goto fail_dput;
	}

	/* Establish highest kernel protocol version */
	if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
		sbi->version = AUTOFS_MAX_PROTO_VERSION;
	else
		sbi->version = sbi->max_proto;
	sbi->sub_version = AUTOFS_PROTO_SUBVERSION;

	if (pgrp_set) {
		sbi->oz_pgrp = find_get_pid(pgrp);
		if (!sbi->oz_pgrp) {
			pr_err("could not find process group %d\n",
				pgrp);
			goto fail_dput;
		}
	} else {
		sbi->oz_pgrp = get_task_pid(current, PIDTYPE_PGID);
	}

	if (autofs_type_trigger(sbi->type))
		__managed_dentry_set_managed(root);

	root_inode->i_fop = &autofs_root_operations;
	root_inode->i_op = &autofs_dir_inode_operations;

	pr_debug("pipe fd = %d, pgrp = %u\n",
		 sbi->pipefd, pid_nr(sbi->oz_pgrp));
	pipe = fget(sbi->pipefd);

	if (!pipe) {
		pr_err("could not open pipe file descriptor\n");
		goto fail_put_pid;
	}
	ret = autofs_prepare_pipe(pipe);
	if (ret < 0)
		goto fail_fput;
	sbi->pipe = pipe;
	sbi->flags &= ~AUTOFS_SBI_CATATONIC;

	/*
	 * Success! Install the root dentry now to indicate completion.
	 */
	s->s_root = root;
	return 0;

	/*
	 * Failure ... clean up.
	 */
fail_fput:
	pr_err("pipe file descriptor does not contain proper ops\n");
	fput(pipe);
fail_put_pid:
	put_pid(sbi->oz_pgrp);
fail_dput:
	dput(root);
	goto fail_free;
fail_ino:
	autofs_free_ino(ino);
fail_free:
	kfree(sbi);
	s->s_fs_info = NULL;
	return ret;
}