From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- fs/autofs/dev-ioctl.c | 741 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 741 insertions(+) create mode 100644 fs/autofs/dev-ioctl.c (limited to 'fs/autofs/dev-ioctl.c') diff --git a/fs/autofs/dev-ioctl.c b/fs/autofs/dev-ioctl.c new file mode 100644 index 000000000..5bf781ea6 --- /dev/null +++ b/fs/autofs/dev-ioctl.c @@ -0,0 +1,741 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright 2008 Red Hat, Inc. All rights reserved. + * Copyright 2008 Ian Kent + */ + +#include +#include +#include +#include +#include +#include + +#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 service shutdown. + */ + +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. + */ +static int invalid_str(char *str, size_t size) +{ + if (memchr(str, 0, size)) + return 0; + 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 ((param->ver_major != AUTOFS_DEV_IOCTL_VERSION_MAJOR) || + (param->ver_minor > AUTOFS_DEV_IOCTL_VERSION_MINOR)) { + pr_warn("ioctl control interface version mismatch: " + "kernel(%u.%u), user(%u.%u), cmd(0x%08x)\n", + 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) +{ + struct autofs_dev_ioctl tmp, *res; + + if (copy_from_user(&tmp, in, AUTOFS_DEV_IOCTL_SIZE)) + return ERR_PTR(-EFAULT); + + if (tmp.size < AUTOFS_DEV_IOCTL_SIZE) + return ERR_PTR(-EINVAL); + + if (tmp.size > AUTOFS_DEV_IOCTL_SIZE + PATH_MAX) + return ERR_PTR(-ENAMETOOLONG); + + res = memdup_user(in, tmp.size); + if (!IS_ERR(res)) + res->size = tmp.size; + + return res; +} + +static inline void free_dev_ioctl(struct autofs_dev_ioctl *param) +{ + kfree(param); +} + +/* + * Check sanity of parameter control fields and if a path is present + * check that it is terminated and contains at least one "/". + */ +static int validate_dev_ioctl(int cmd, struct autofs_dev_ioctl *param) +{ + int err; + + err = check_dev_ioctl_version(cmd, param); + if (err) { + pr_warn("invalid device control module version " + "supplied for cmd(0x%08x)\n", cmd); + goto out; + } + + if (param->size > AUTOFS_DEV_IOCTL_SIZE) { + err = invalid_str(param->path, param->size - AUTOFS_DEV_IOCTL_SIZE); + if (err) { + pr_warn( + "path string terminator missing for cmd(0x%08x)\n", + cmd); + goto out; + } + + err = check_name(param->path); + if (err) { + pr_warn("invalid path supplied for cmd(0x%08x)\n", + cmd); + goto out; + } + } else { + unsigned int inr = _IOC_NR(cmd); + + if (inr == AUTOFS_DEV_IOCTL_OPENMOUNT_CMD || + inr == AUTOFS_DEV_IOCTL_REQUESTER_CMD || + inr == AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD) { + err = -EINVAL; + goto out; + } + } + + err = 0; +out: + return err; +} + +/* Return autofs dev ioctl version */ +static int autofs_dev_ioctl_version(struct file *fp, + struct autofs_sb_info *sbi, + struct autofs_dev_ioctl *param) +{ + /* This should have already been set. */ + param->ver_major = AUTOFS_DEV_IOCTL_VERSION_MAJOR; + param->ver_minor = AUTOFS_DEV_IOCTL_VERSION_MINOR; + return 0; +} + +/* Return autofs module protocol version */ +static int autofs_dev_ioctl_protover(struct file *fp, + struct autofs_sb_info *sbi, + struct autofs_dev_ioctl *param) +{ + param->protover.version = sbi->version; + 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) +{ + param->protosubver.sub_version = sbi->sub_version; + return 0; +} + +/* Find the topmost mount satisfying test() */ +static int find_autofs_mount(const char *pathname, + struct path *res, + int test(const struct path *path, void *data), + void *data) +{ + struct path path; + int err; + + err = kern_path(pathname, LOOKUP_MOUNTPOINT, &path); + if (err) + return err; + err = -ENOENT; + while (path.dentry == path.mnt->mnt_root) { + if (path.dentry->d_sb->s_magic == AUTOFS_SUPER_MAGIC) { + if (test(&path, data)) { + path_get(&path); + *res = path; + err = 0; + break; + } + } + if (!follow_up(&path)) + break; + } + path_put(&path); + return err; +} + +static int test_by_dev(const struct path *path, void *p) +{ + return path->dentry->d_sb->s_dev == *(dev_t *)p; +} + +static int test_by_type(const struct path *path, void *p) +{ + struct autofs_info *ino = autofs_dentry_ino(path->dentry); + + return ino && ino->sbi->type & *(unsigned *)p; +} + +/* + * Open a file descriptor on the autofs mount point corresponding + * to the given path and device number (aka. new_encode_dev(sb->s_dev)). + */ +static int autofs_dev_ioctl_open_mountpoint(const char *name, dev_t devid) +{ + int err, fd; + + fd = get_unused_fd_flags(O_CLOEXEC); + if (likely(fd >= 0)) { + struct file *filp; + struct path path; + + err = find_autofs_mount(name, &path, test_by_dev, &devid); + if (err) + goto out; + + filp = dentry_open(&path, O_RDONLY, current_cred()); + path_put(&path); + if (IS_ERR(filp)) { + err = PTR_ERR(filp); + goto out; + } + + 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 been checked in validate_dev_ioctl() */ + + if (!param->openmount.devid) + return -EINVAL; + + param->ioctlfd = -1; + + path = param->path; + devid = new_decode_dev(param->openmount.devid); + + 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 close_fd(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; + + token = (autofs_wqt_t) param->ready.token; + return autofs_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; + + token = (autofs_wqt_t) param->fail.token; + status = param->fail.status < 0 ? param->fail.status : -ENOENT; + return autofs_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; + struct pid *new_pid = NULL; + + if (param->setpipefd.pipefd == -1) + return -EINVAL; + + pipefd = param->setpipefd.pipefd; + + mutex_lock(&sbi->wq_mutex); + if (!(sbi->flags & AUTOFS_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->flags &= ~AUTOFS_SBI_CATATONIC; + } +out: + put_pid(new_pid); + 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) +{ + autofs_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; + + timeout = param->timeout.timeout; + param->timeout.timeout = sbi->exp_timeout / HZ; + 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; + struct path path; + dev_t devid; + int err = -ENOENT; + + /* param->path has been checked in validate_dev_ioctl() */ + + devid = sbi->sb->s_dev; + + param->requester.uid = param->requester.gid = -1; + + err = find_autofs_mount(param->path, &path, test_by_dev, &devid); + if (err) + goto out; + + ino = autofs_dentry_ino(path.dentry); + if (ino) { + err = 0; + autofs_expire_wait(&path, 0); + spin_lock(&sbi->fs_lock); + param->requester.uid = + from_kuid_munged(current_user_ns(), ino->uid); + param->requester.gid = + from_kgid_munged(current_user_ns(), ino->gid); + spin_unlock(&sbi->fs_lock); + } + path_put(&path); +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) +{ + struct vfsmount *mnt; + int how; + + how = param->expire.how; + mnt = fp->f_path.mnt; + + return autofs_do_expire_multi(sbi->sb, mnt, sbi, how); +} + +/* 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) +{ + param->askumount.may_umount = 0; + if (may_umount(fp->f_path.mnt)) + param->askumount.may_umount = 1; + 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 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 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 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) +{ + struct path path; + const char *name; + unsigned int type; + unsigned int devid, magic; + int err = -ENOENT; + + /* param->path has been checked in validate_dev_ioctl() */ + + name = param->path; + type = param->ismountpoint.in.type; + + param->ismountpoint.out.devid = devid = 0; + param->ismountpoint.out.magic = magic = 0; + + if (!fp || param->ioctlfd == -1) { + if (autofs_type_any(type)) + err = kern_path(name, LOOKUP_FOLLOW | LOOKUP_MOUNTPOINT, + &path); + else + err = find_autofs_mount(name, &path, + test_by_type, &type); + if (err) + goto out; + devid = new_encode_dev(path.dentry->d_sb->s_dev); + err = 0; + if (path.mnt->mnt_root == path.dentry) { + err = 1; + magic = path.dentry->d_sb->s_magic; + } + } else { + dev_t dev = sbi->sb->s_dev; + + err = find_autofs_mount(name, &path, test_by_dev, &dev); + if (err) + goto out; + + devid = new_encode_dev(dev); + + err = path_has_submounts(&path); + + if (follow_down_one(&path)) + magic = path.dentry->d_sb->s_magic; + } + + param->ismountpoint.out.devid = devid; + param->ismountpoint.out.magic = magic; + path_put(&path); +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 const ioctl_fn _ioctls[] = { + autofs_dev_ioctl_version, + autofs_dev_ioctl_protover, + autofs_dev_ioctl_protosubver, + autofs_dev_ioctl_openmount, + autofs_dev_ioctl_closemount, + autofs_dev_ioctl_ready, + autofs_dev_ioctl_fail, + autofs_dev_ioctl_setpipefd, + autofs_dev_ioctl_catatonic, + autofs_dev_ioctl_timeout, + autofs_dev_ioctl_requester, + autofs_dev_ioctl_expire, + autofs_dev_ioctl_askumount, + autofs_dev_ioctl_ismountpoint, + }; + unsigned int idx = cmd_idx(cmd); + + if (idx >= ARRAY_SIZE(_ioctls)) + return NULL; + idx = array_index_nospec(idx, ARRAY_SIZE(_ioctls)); + return _ioctls[idx]; +} + +/* 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; + + 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; + } + + /* Only root can use ioctls other than AUTOFS_DEV_IOCTL_VERSION_CMD + * and AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD + */ + if (cmd != AUTOFS_DEV_IOCTL_VERSION_CMD && + cmd != AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD && + !capable(CAP_SYS_ADMIN)) + return -EPERM; + + /* 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; + + fn = lookup_dev_ioctl(cmd); + if (!fn) { + pr_warn("unknown command 0x%08x\n", command); + err = -ENOTTY; + goto out; + } + + 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, + * and the same for retrieving ioctl version. + */ + if (cmd != AUTOFS_DEV_IOCTL_VERSION_CMD && + cmd != AUTOFS_DEV_IOCTL_OPENMOUNT_CMD && + cmd != AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD) { + struct super_block *sb; + + fp = fget(param->ioctlfd); + if (!fp) { + if (cmd == AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD) + goto cont; + err = -EBADF; + goto out; + } + + sb = file_inode(fp)->i_sb; + if (sb->s_type != &autofs_fs_type) { + err = -EINVAL; + fput(fp); + goto out; + } + sbi = autofs_sbi(sb); + + /* + * Admin needs to be able to set the mount catatonic in + * order to be able to perform the re-open. + */ + if (!autofs_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); + 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, unsigned int command, + unsigned long 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, unsigned int command, + unsigned long u) +{ + return autofs_dev_ioctl(file, command, (unsigned long) 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, + .llseek = noop_llseek, +}; + +static struct miscdevice _autofs_dev_ioctl_misc = { + .minor = AUTOFS_MINOR, + .name = AUTOFS_DEVICE_NAME, + .fops = &_dev_ioctl_fops, + .mode = 0644, +}; + +MODULE_ALIAS_MISCDEV(AUTOFS_MINOR); +MODULE_ALIAS("devname:autofs"); + +/* Register/deregister misc character device */ +int __init autofs_dev_ioctl_init(void) +{ + int r; + + r = misc_register(&_autofs_dev_ioctl_misc); + if (r) { + pr_err("misc_register failed for control device\n"); + return r; + } + + return 0; +} + +void autofs_dev_ioctl_exit(void) +{ + misc_deregister(&_autofs_dev_ioctl_misc); +} -- cgit v1.2.3