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fs/autofs4/dev-ioctl.c
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/* * Copyright 2008 Red Hat, Inc. All rights reserved. * Copyright 2008 Ian Kent <raven@themaw.net> * * This file is part of the Linux kernel and is made available under * the terms of the GNU General Public License, version 2, or at your * option, any later version, incorporated herein by reference. */ #include <linux/module.h> #include <linux/vmalloc.h> #include <linux/miscdevice.h> #include <linux/init.h> #include <linux/wait.h> #include <linux/namei.h> #include <linux/fcntl.h> #include <linux/file.h> #include <linux/fdtable.h> #include <linux/sched.h> #include <linux/compat.h> #include <linux/syscalls.h> |
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#include <linux/magic.h> #include <linux/dcache.h> #include <linux/uaccess.h> |
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#include <linux/slab.h> |
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#include "autofs_i.h" /* * This module implements an interface for routing autofs ioctl control * commands via a miscellaneous device file. * * The alternate interface is needed because we need to be able open * an ioctl file descriptor on an autofs mount that may be covered by * another mount. This situation arises when starting automount(8) * or other user space daemon which uses direct mounts or offset * mounts (used for autofs lazy mount/umount of nested mount trees), * which have been left busy at at service shutdown. */ #define AUTOFS_DEV_IOCTL_SIZE sizeof(struct autofs_dev_ioctl) typedef int (*ioctl_fn)(struct file *, struct autofs_sb_info *, struct autofs_dev_ioctl *); static int check_name(const char *name) { if (!strchr(name, '/')) return -EINVAL; return 0; } /* * Check a string doesn't overrun the chunk of * memory we copied from user land. */ |
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static int invalid_str(char *str, size_t size) |
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{ |
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if (memchr(str, 0, size)) return 0; |
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return -EINVAL; } /* * Check that the user compiled against correct version of autofs * misc device code. * * As well as checking the version compatibility this always copies * the kernel interface version out. */ static int check_dev_ioctl_version(int cmd, struct autofs_dev_ioctl *param) { int err = 0; if ((AUTOFS_DEV_IOCTL_VERSION_MAJOR != param->ver_major) || (AUTOFS_DEV_IOCTL_VERSION_MINOR < param->ver_minor)) { AUTOFS_WARN("ioctl control interface version mismatch: " "kernel(%u.%u), user(%u.%u), cmd(%d)", AUTOFS_DEV_IOCTL_VERSION_MAJOR, AUTOFS_DEV_IOCTL_VERSION_MINOR, param->ver_major, param->ver_minor, cmd); err = -EINVAL; } /* Fill in the kernel version. */ param->ver_major = AUTOFS_DEV_IOCTL_VERSION_MAJOR; param->ver_minor = AUTOFS_DEV_IOCTL_VERSION_MINOR; return err; } /* * Copy parameter control struct, including a possible path allocated * at the end of the struct. */ static struct autofs_dev_ioctl *copy_dev_ioctl(struct autofs_dev_ioctl __user *in) { |
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struct autofs_dev_ioctl tmp; |
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if (copy_from_user(&tmp, in, sizeof(tmp))) return ERR_PTR(-EFAULT); if (tmp.size < sizeof(tmp)) return ERR_PTR(-EINVAL); |
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return memdup_user(in, tmp.size); |
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} static inline void free_dev_ioctl(struct autofs_dev_ioctl *param) { kfree(param); return; } /* * Check sanity of parameter control fields and if a path is present |
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* check that it is terminated and contains at least one "/". |
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*/ static int validate_dev_ioctl(int cmd, struct autofs_dev_ioctl *param) { |
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int err; |
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|
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err = check_dev_ioctl_version(cmd, param); if (err) { |
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AUTOFS_WARN("invalid device control module version " "supplied for cmd(0x%08x)", cmd); goto out; } if (param->size > sizeof(*param)) { |
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err = invalid_str(param->path, param->size - sizeof(*param)); |
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if (err) { |
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AUTOFS_WARN( "path string terminator missing for cmd(0x%08x)", cmd); |
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goto out; } |
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err = check_name(param->path); |
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if (err) { AUTOFS_WARN("invalid path supplied for cmd(0x%08x)", cmd); goto out; } } err = 0; out: return err; } /* * Get the autofs super block info struct from the file opened on * the autofs mount point. */ static struct autofs_sb_info *autofs_dev_ioctl_sbi(struct file *f) { struct autofs_sb_info *sbi = NULL; struct inode *inode; if (f) { inode = f->f_path.dentry->d_inode; sbi = autofs4_sbi(inode->i_sb); } return sbi; } /* Return autofs module protocol version */ static int autofs_dev_ioctl_protover(struct file *fp, struct autofs_sb_info *sbi, struct autofs_dev_ioctl *param) { |
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param->protover.version = sbi->version; |
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return 0; } /* Return autofs module protocol sub version */ static int autofs_dev_ioctl_protosubver(struct file *fp, struct autofs_sb_info *sbi, struct autofs_dev_ioctl *param) { |
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param->protosubver.sub_version = sbi->sub_version; |
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return 0; } |
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static int find_autofs_mount(const char *pathname, struct path *res, int test(struct path *path, void *data), void *data) |
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{ |
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struct path path; int err = kern_path(pathname, 0, &path); if (err) return err; |
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err = -ENOENT; |
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while (path.dentry == path.mnt->mnt_root) { if (path.mnt->mnt_sb->s_magic == AUTOFS_SUPER_MAGIC) { if (test(&path, data)) { path_get(&path); if (!err) /* already found some */ path_put(res); *res = path; |
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err = 0; |
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} } |
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if (!follow_up(&path)) |
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break; |
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} |
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path_put(&path); |
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return err; } |
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static int test_by_dev(struct path *path, void *p) |
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{ |
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return path->mnt->mnt_sb->s_dev == *(dev_t *)p; } |
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|
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static int test_by_type(struct path *path, void *p) { struct autofs_info *ino = autofs4_dentry_ino(path->dentry); return ino && ino->sbi->type & *(unsigned *)p; |
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} static void autofs_dev_ioctl_fd_install(unsigned int fd, struct file *file) { struct files_struct *files = current->files; struct fdtable *fdt; spin_lock(&files->file_lock); fdt = files_fdtable(files); BUG_ON(fdt->fd[fd] != NULL); rcu_assign_pointer(fdt->fd[fd], file); FD_SET(fd, fdt->close_on_exec); spin_unlock(&files->file_lock); } /* * Open a file descriptor on the autofs mount point corresponding * to the given path and device number (aka. new_encode_dev(sb->s_dev)). */ |
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static int autofs_dev_ioctl_open_mountpoint(const char *name, dev_t devid) |
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{ |
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int err, fd; fd = get_unused_fd(); if (likely(fd >= 0)) { |
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struct file *filp; struct path path; err = find_autofs_mount(name, &path, test_by_dev, &devid); |
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if (err) goto out; /* |
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* Find autofs super block that has the device number |
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* corresponding to the autofs fs we want to open. */ |
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|
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filp = dentry_open(path.dentry, path.mnt, O_RDONLY, |
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current_cred()); |
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if (IS_ERR(filp)) { err = PTR_ERR(filp); goto out; } autofs_dev_ioctl_fd_install(fd, filp); } return fd; out: put_unused_fd(fd); return err; } /* Open a file descriptor on an autofs mount point */ static int autofs_dev_ioctl_openmount(struct file *fp, struct autofs_sb_info *sbi, struct autofs_dev_ioctl *param) { const char *path; dev_t devid; int err, fd; /* param->path has already been checked */ |
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if (!param->openmount.devid) |
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return -EINVAL; param->ioctlfd = -1; path = param->path; |
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devid = new_decode_dev(param->openmount.devid); |
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err = 0; fd = autofs_dev_ioctl_open_mountpoint(path, devid); if (unlikely(fd < 0)) { err = fd; goto out; } param->ioctlfd = fd; out: return err; } /* Close file descriptor allocated above (user can also use close(2)). */ static int autofs_dev_ioctl_closemount(struct file *fp, struct autofs_sb_info *sbi, struct autofs_dev_ioctl *param) { return sys_close(param->ioctlfd); } /* * Send "ready" status for an existing wait (either a mount or an expire * request). */ static int autofs_dev_ioctl_ready(struct file *fp, struct autofs_sb_info *sbi, struct autofs_dev_ioctl *param) { autofs_wqt_t token; |
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token = (autofs_wqt_t) param->ready.token; |
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return autofs4_wait_release(sbi, token, 0); } /* * Send "fail" status for an existing wait (either a mount or an expire * request). */ static int autofs_dev_ioctl_fail(struct file *fp, struct autofs_sb_info *sbi, struct autofs_dev_ioctl *param) { autofs_wqt_t token; int status; |
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token = (autofs_wqt_t) param->fail.token; status = param->fail.status ? param->fail.status : -ENOENT; |
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return autofs4_wait_release(sbi, token, status); } /* * 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; |
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if (param->setpipefd.pipefd == -1) |
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return -EINVAL; |
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pipefd = param->setpipefd.pipefd; |
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mutex_lock(&sbi->wq_mutex); if (!sbi->catatonic) { mutex_unlock(&sbi->wq_mutex); return -EBUSY; } else { struct file *pipe = fget(pipefd); |
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if (!pipe) { err = -EBADF; goto out; } |
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if (!pipe->f_op || !pipe->f_op->write) { 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; } /* * Make the autofs mount point catatonic, no longer responsive to * mount requests. Also closes the kernel pipe file descriptor. */ static int autofs_dev_ioctl_catatonic(struct file *fp, struct autofs_sb_info *sbi, struct autofs_dev_ioctl *param) { autofs4_catatonic_mode(sbi); return 0; } /* Set the autofs mount timeout */ static int autofs_dev_ioctl_timeout(struct file *fp, struct autofs_sb_info *sbi, struct autofs_dev_ioctl *param) { unsigned long timeout; |
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timeout = param->timeout.timeout; param->timeout.timeout = sbi->exp_timeout / HZ; |
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sbi->exp_timeout = timeout * HZ; return 0; } /* * Return the uid and gid of the last request for the mount * * When reconstructing an autofs mount tree with active mounts * we need to re-connect to mounts that may have used the original * process uid and gid (or string variations of them) for mount * lookups within the map entry. */ static int autofs_dev_ioctl_requester(struct file *fp, struct autofs_sb_info *sbi, struct autofs_dev_ioctl *param) { struct autofs_info *ino; |
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struct path path; |
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dev_t devid; int err = -ENOENT; if (param->size <= sizeof(*param)) { err = -EINVAL; goto out; } |
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devid = sbi->sb->s_dev; |
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|
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param->requester.uid = param->requester.gid = -1; |
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|
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err = find_autofs_mount(param->path, &path, test_by_dev, &devid); |
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if (err) goto out; |
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ino = autofs4_dentry_ino(path.dentry); |
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if (ino) { err = 0; |
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autofs4_expire_wait(path.dentry); |
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spin_lock(&sbi->fs_lock); |
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param->requester.uid = ino->uid; param->requester.gid = ino->gid; |
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spin_unlock(&sbi->fs_lock); } |
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path_put(&path); |
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out: return err; } /* * Call repeatedly until it returns -EAGAIN, meaning there's nothing * more that can be done. */ static int autofs_dev_ioctl_expire(struct file *fp, struct autofs_sb_info *sbi, struct autofs_dev_ioctl *param) { |
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struct vfsmount *mnt; |
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int how; |
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how = param->expire.how; |
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mnt = fp->f_path.mnt; |
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return autofs4_do_expire_multi(sbi->sb, mnt, sbi, how); |
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} /* Check if autofs mount point is in use */ static int autofs_dev_ioctl_askumount(struct file *fp, struct autofs_sb_info *sbi, struct autofs_dev_ioctl *param) { |
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param->askumount.may_umount = 0; |
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if (may_umount(fp->f_path.mnt)) |
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param->askumount.may_umount = 1; |
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return 0; } /* * Check if the given path is a mountpoint. * * If we are supplied with the file descriptor of an autofs * mount we're looking for a specific mount. In this case * the path is considered a mountpoint if it is itself a * mountpoint or contains a mount, such as a multi-mount * without a root mount. In this case we return 1 if the * path is a mount point and the super magic of the covering * mount if there is one or 0 if it isn't a mountpoint. * * If we aren't supplied with a file descriptor then we * lookup the nameidata of the path and check if it is the * root of a mount. If a type is given we are looking for * a particular autofs mount and if we don't find a match * we return fail. If the located nameidata path is the * root of a mount we return 1 along with the super magic * of the mount or 0 otherwise. * * In both cases the the device number (as returned by * new_encode_dev()) is also returned. */ static int autofs_dev_ioctl_ismountpoint(struct file *fp, struct autofs_sb_info *sbi, struct autofs_dev_ioctl *param) { |
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struct path path; const char *name; |
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unsigned int type; |
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unsigned int devid, magic; |
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int err = -ENOENT; if (param->size <= sizeof(*param)) { err = -EINVAL; goto out; } |
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name = param->path; |
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type = param->ismountpoint.in.type; |
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|
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param->ismountpoint.out.devid = devid = 0; param->ismountpoint.out.magic = magic = 0; |
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if (!fp || param->ioctlfd == -1) { |
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if (autofs_type_any(type)) err = kern_path(name, LOOKUP_FOLLOW, &path); else err = find_autofs_mount(name, &path, test_by_type, &type); if (err) goto out; devid = new_encode_dev(path.mnt->mnt_sb->s_dev); |
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err = 0; |
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if (path.mnt->mnt_root == path.dentry) { |
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err = 1; |
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magic = path.mnt->mnt_sb->s_magic; |
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} } else { |
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dev_t dev = sbi->sb->s_dev; |
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|
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err = find_autofs_mount(name, &path, test_by_dev, &dev); |
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if (err) goto out; |
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devid = new_encode_dev(dev); |
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|
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err = have_submounts(path.dentry); |
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|
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if (follow_down_one(&path)) |
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magic = path.mnt->mnt_sb->s_magic; |
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} |
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param->ismountpoint.out.devid = devid; param->ismountpoint.out.magic = magic; |
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path_put(&path); |
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out: return err; } /* * Our range of ioctl numbers isn't 0 based so we need to shift * the array index by _IOC_NR(AUTOFS_CTL_IOC_FIRST) for the table * lookup. */ #define cmd_idx(cmd) (cmd - _IOC_NR(AUTOFS_DEV_IOCTL_IOC_FIRST)) static ioctl_fn lookup_dev_ioctl(unsigned int cmd) { static struct { int cmd; ioctl_fn fn; } _ioctls[] = { {cmd_idx(AUTOFS_DEV_IOCTL_VERSION_CMD), NULL}, {cmd_idx(AUTOFS_DEV_IOCTL_PROTOVER_CMD), autofs_dev_ioctl_protover}, {cmd_idx(AUTOFS_DEV_IOCTL_PROTOSUBVER_CMD), autofs_dev_ioctl_protosubver}, {cmd_idx(AUTOFS_DEV_IOCTL_OPENMOUNT_CMD), autofs_dev_ioctl_openmount}, {cmd_idx(AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD), autofs_dev_ioctl_closemount}, {cmd_idx(AUTOFS_DEV_IOCTL_READY_CMD), autofs_dev_ioctl_ready}, {cmd_idx(AUTOFS_DEV_IOCTL_FAIL_CMD), autofs_dev_ioctl_fail}, {cmd_idx(AUTOFS_DEV_IOCTL_SETPIPEFD_CMD), autofs_dev_ioctl_setpipefd}, {cmd_idx(AUTOFS_DEV_IOCTL_CATATONIC_CMD), autofs_dev_ioctl_catatonic}, {cmd_idx(AUTOFS_DEV_IOCTL_TIMEOUT_CMD), autofs_dev_ioctl_timeout}, {cmd_idx(AUTOFS_DEV_IOCTL_REQUESTER_CMD), autofs_dev_ioctl_requester}, {cmd_idx(AUTOFS_DEV_IOCTL_EXPIRE_CMD), autofs_dev_ioctl_expire}, {cmd_idx(AUTOFS_DEV_IOCTL_ASKUMOUNT_CMD), autofs_dev_ioctl_askumount}, {cmd_idx(AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD), autofs_dev_ioctl_ismountpoint} }; unsigned int idx = cmd_idx(cmd); return (idx >= ARRAY_SIZE(_ioctls)) ? NULL : _ioctls[idx].fn; } /* ioctl dispatcher */ static int _autofs_dev_ioctl(unsigned int command, struct autofs_dev_ioctl __user *user) { struct autofs_dev_ioctl *param; struct file *fp; struct autofs_sb_info *sbi; unsigned int cmd_first, cmd; ioctl_fn fn = NULL; int err = 0; /* only root can play with this */ if (!capable(CAP_SYS_ADMIN)) return -EPERM; cmd_first = _IOC_NR(AUTOFS_DEV_IOCTL_IOC_FIRST); cmd = _IOC_NR(command); if (_IOC_TYPE(command) != _IOC_TYPE(AUTOFS_DEV_IOCTL_IOC_FIRST) || cmd - cmd_first >= AUTOFS_DEV_IOCTL_IOC_COUNT) { return -ENOTTY; } /* Copy the parameters into kernel space. */ param = copy_dev_ioctl(user); if (IS_ERR(param)) return PTR_ERR(param); err = validate_dev_ioctl(command, param); if (err) goto out; /* The validate routine above always sets the version */ if (cmd == AUTOFS_DEV_IOCTL_VERSION_CMD) goto done; fn = lookup_dev_ioctl(cmd); if (!fn) { AUTOFS_WARN("unknown command 0x%08x", command); return -ENOTTY; } fp = NULL; sbi = NULL; /* * For obvious reasons the openmount can't have a file * descriptor yet. We don't take a reference to the * file during close to allow for immediate release. */ if (cmd != AUTOFS_DEV_IOCTL_OPENMOUNT_CMD && cmd != AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD) { fp = fget(param->ioctlfd); if (!fp) { if (cmd == AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD) goto cont; err = -EBADF; goto out; } if (!fp->f_op) { err = -ENOTTY; fput(fp); goto out; } sbi = autofs_dev_ioctl_sbi(fp); if (!sbi || sbi->magic != AUTOFS_SBI_MAGIC) { err = -EINVAL; fput(fp); goto out; } /* * Admin needs to be able to set the mount catatonic in * order to be able to perform the re-open. */ if (!autofs4_oz_mode(sbi) && cmd != AUTOFS_DEV_IOCTL_CATATONIC_CMD) { err = -EACCES; fput(fp); goto out; } } cont: err = fn(fp, sbi, param); if (fp) fput(fp); done: if (err >= 0 && copy_to_user(user, param, AUTOFS_DEV_IOCTL_SIZE)) err = -EFAULT; out: free_dev_ioctl(param); return err; } static long autofs_dev_ioctl(struct file *file, uint command, ulong u) { int err; err = _autofs_dev_ioctl(command, (struct autofs_dev_ioctl __user *) u); return (long) err; } #ifdef CONFIG_COMPAT static long autofs_dev_ioctl_compat(struct file *file, uint command, ulong u) { return (long) autofs_dev_ioctl(file, command, (ulong) compat_ptr(u)); } #else #define autofs_dev_ioctl_compat NULL #endif static const struct file_operations _dev_ioctl_fops = { .unlocked_ioctl = autofs_dev_ioctl, .compat_ioctl = autofs_dev_ioctl_compat, .owner = THIS_MODULE, |
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.llseek = noop_llseek, |
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}; static struct miscdevice _autofs_dev_ioctl_misc = { |
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.minor = AUTOFS_MINOR, |
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.name = AUTOFS_DEVICE_NAME, .fops = &_dev_ioctl_fops }; |
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MODULE_ALIAS_MISCDEV(AUTOFS_MINOR); MODULE_ALIAS("devname:autofs"); |
8d7b48e0b autofs4: add misc... |
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/* Register/deregister misc character device */ int autofs_dev_ioctl_init(void) { int r; r = misc_register(&_autofs_dev_ioctl_misc); if (r) { AUTOFS_ERROR("misc_register failed for control device"); return r; } return 0; } void autofs_dev_ioctl_exit(void) { misc_deregister(&_autofs_dev_ioctl_misc); return; } |