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741 lines
18 KiB
741 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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* Copyright 2008 Red Hat, Inc. All rights reserved. |
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* Copyright 2008 Ian Kent <[email protected]> |
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*/ |
|
|
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#include <linux/module.h> |
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#include <linux/miscdevice.h> |
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#include <linux/compat.h> |
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#include <linux/fdtable.h> |
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#include <linux/magic.h> |
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#include <linux/nospec.h> |
|
|
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#include "autofs_i.h" |
|
|
|
/* |
|
* This module implements an interface for routing autofs ioctl control |
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* commands via a miscellaneous device file. |
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* |
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* The alternate interface is needed because we need to be able open |
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* an ioctl file descriptor on an autofs mount that may be covered by |
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* another mount. This situation arises when starting automount(8) |
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* or other user space daemon which uses direct mounts or offset |
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* mounts (used for autofs lazy mount/umount of nested mount trees), |
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* which have been left busy at service shutdown. |
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*/ |
|
|
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typedef int (*ioctl_fn)(struct file *, struct autofs_sb_info *, |
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struct autofs_dev_ioctl *); |
|
|
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static int check_name(const char *name) |
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{ |
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if (!strchr(name, '/')) |
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return -EINVAL; |
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return 0; |
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} |
|
|
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/* |
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* Check a string doesn't overrun the chunk of |
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* memory we copied from user land. |
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*/ |
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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)) |
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return 0; |
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return -EINVAL; |
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} |
|
|
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/* |
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* Check that the user compiled against correct version of autofs |
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* misc device code. |
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* |
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* As well as checking the version compatibility this always copies |
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* the kernel interface version out. |
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*/ |
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static int check_dev_ioctl_version(int cmd, struct autofs_dev_ioctl *param) |
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{ |
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int err = 0; |
|
|
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if ((param->ver_major != AUTOFS_DEV_IOCTL_VERSION_MAJOR) || |
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(param->ver_minor > AUTOFS_DEV_IOCTL_VERSION_MINOR)) { |
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pr_warn("ioctl control interface version mismatch: " |
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"kernel(%u.%u), user(%u.%u), cmd(0x%08x)\n", |
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AUTOFS_DEV_IOCTL_VERSION_MAJOR, |
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AUTOFS_DEV_IOCTL_VERSION_MINOR, |
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param->ver_major, param->ver_minor, cmd); |
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err = -EINVAL; |
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} |
|
|
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/* Fill in the kernel version. */ |
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param->ver_major = AUTOFS_DEV_IOCTL_VERSION_MAJOR; |
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param->ver_minor = AUTOFS_DEV_IOCTL_VERSION_MINOR; |
|
|
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return err; |
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} |
|
|
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/* |
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* Copy parameter control struct, including a possible path allocated |
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* at the end of the struct. |
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*/ |
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static struct autofs_dev_ioctl * |
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copy_dev_ioctl(struct autofs_dev_ioctl __user *in) |
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{ |
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struct autofs_dev_ioctl tmp, *res; |
|
|
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if (copy_from_user(&tmp, in, AUTOFS_DEV_IOCTL_SIZE)) |
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return ERR_PTR(-EFAULT); |
|
|
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if (tmp.size < AUTOFS_DEV_IOCTL_SIZE) |
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return ERR_PTR(-EINVAL); |
|
|
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if (tmp.size > AUTOFS_DEV_IOCTL_SIZE + PATH_MAX) |
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return ERR_PTR(-ENAMETOOLONG); |
|
|
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res = memdup_user(in, tmp.size); |
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if (!IS_ERR(res)) |
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res->size = tmp.size; |
|
|
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return res; |
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} |
|
|
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static inline void free_dev_ioctl(struct autofs_dev_ioctl *param) |
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{ |
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kfree(param); |
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} |
|
|
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/* |
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* 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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*/ |
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static int validate_dev_ioctl(int cmd, struct autofs_dev_ioctl *param) |
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{ |
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int err; |
|
|
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err = check_dev_ioctl_version(cmd, param); |
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if (err) { |
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pr_warn("invalid device control module version " |
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"supplied for cmd(0x%08x)\n", cmd); |
|
goto out; |
|
} |
|
|
|
if (param->size > AUTOFS_DEV_IOCTL_SIZE) { |
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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); |
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goto out; |
|
} |
|
|
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err = check_name(param->path); |
|
if (err) { |
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pr_warn("invalid path supplied for cmd(0x%08x)\n", |
|
cmd); |
|
goto out; |
|
} |
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} else { |
|
unsigned int inr = _IOC_NR(cmd); |
|
|
|
if (inr == AUTOFS_DEV_IOCTL_OPENMOUNT_CMD || |
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inr == AUTOFS_DEV_IOCTL_REQUESTER_CMD || |
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inr == AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD) { |
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err = -EINVAL; |
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goto out; |
|
} |
|
} |
|
|
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err = 0; |
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out: |
|
return err; |
|
} |
|
|
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/* Return autofs dev ioctl version */ |
|
static int autofs_dev_ioctl_version(struct file *fp, |
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struct autofs_sb_info *sbi, |
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struct autofs_dev_ioctl *param) |
|
{ |
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/* This should have already been set. */ |
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param->ver_major = AUTOFS_DEV_IOCTL_VERSION_MAJOR; |
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param->ver_minor = AUTOFS_DEV_IOCTL_VERSION_MINOR; |
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return 0; |
|
} |
|
|
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/* Return autofs module protocol version */ |
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static int autofs_dev_ioctl_protover(struct file *fp, |
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struct autofs_sb_info *sbi, |
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struct autofs_dev_ioctl *param) |
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{ |
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param->protover.version = sbi->version; |
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return 0; |
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} |
|
|
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/* Return autofs module protocol sub version */ |
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static int autofs_dev_ioctl_protosubver(struct file *fp, |
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struct autofs_sb_info *sbi, |
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struct autofs_dev_ioctl *param) |
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{ |
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param->protosubver.sub_version = sbi->sub_version; |
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return 0; |
|
} |
|
|
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/* Find the topmost mount satisfying test() */ |
|
static int find_autofs_mount(const char *pathname, |
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struct path *res, |
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int test(const struct path *path, void *data), |
|
void *data) |
|
{ |
|
struct path path; |
|
int err; |
|
|
|
err = kern_path(pathname, LOOKUP_MOUNTPOINT, &path); |
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if (err) |
|
return err; |
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err = -ENOENT; |
|
while (path.dentry == path.mnt->mnt_root) { |
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if (path.dentry->d_sb->s_magic == AUTOFS_SUPER_MAGIC) { |
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if (test(&path, data)) { |
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path_get(&path); |
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*res = path; |
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err = 0; |
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break; |
|
} |
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} |
|
if (!follow_up(&path)) |
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break; |
|
} |
|
path_put(&path); |
|
return err; |
|
} |
|
|
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static int test_by_dev(const struct path *path, void *p) |
|
{ |
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return path->dentry->d_sb->s_dev == *(dev_t *)p; |
|
} |
|
|
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static int test_by_type(const struct path *path, void *p) |
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{ |
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struct autofs_info *ino = autofs_dentry_ino(path->dentry); |
|
|
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return ino && ino->sbi->type & *(unsigned *)p; |
|
} |
|
|
|
/* |
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* Open a file descriptor on the autofs mount point corresponding |
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* 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; |
|
|
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fd = get_unused_fd_flags(O_CLOEXEC); |
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if (likely(fd >= 0)) { |
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struct file *filp; |
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struct path path; |
|
|
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err = find_autofs_mount(name, &path, test_by_dev, &devid); |
|
if (err) |
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goto out; |
|
|
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filp = dentry_open(&path, O_RDONLY, current_cred()); |
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path_put(&path); |
|
if (IS_ERR(filp)) { |
|
err = PTR_ERR(filp); |
|
goto out; |
|
} |
|
|
|
fd_install(fd, filp); |
|
} |
|
|
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return fd; |
|
|
|
out: |
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put_unused_fd(fd); |
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return err; |
|
} |
|
|
|
/* Open a file descriptor on an autofs mount point */ |
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static int autofs_dev_ioctl_openmount(struct file *fp, |
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struct autofs_sb_info *sbi, |
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struct autofs_dev_ioctl *param) |
|
{ |
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const char *path; |
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dev_t devid; |
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int err, fd; |
|
|
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/* param->path has been checked in validate_dev_ioctl() */ |
|
|
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if (!param->openmount.devid) |
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return -EINVAL; |
|
|
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param->ioctlfd = -1; |
|
|
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path = param->path; |
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devid = new_decode_dev(param->openmount.devid); |
|
|
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err = 0; |
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fd = autofs_dev_ioctl_open_mountpoint(path, devid); |
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if (unlikely(fd < 0)) { |
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err = fd; |
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goto out; |
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} |
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|
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param->ioctlfd = fd; |
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out: |
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return err; |
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} |
|
|
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/* Close file descriptor allocated above (user can also use close(2)). */ |
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static int autofs_dev_ioctl_closemount(struct file *fp, |
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struct autofs_sb_info *sbi, |
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struct autofs_dev_ioctl *param) |
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{ |
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return close_fd(param->ioctlfd); |
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} |
|
|
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/* |
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* Send "ready" status for an existing wait (either a mount or an expire |
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* request). |
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*/ |
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static int autofs_dev_ioctl_ready(struct file *fp, |
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struct autofs_sb_info *sbi, |
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struct autofs_dev_ioctl *param) |
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{ |
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autofs_wqt_t token; |
|
|
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token = (autofs_wqt_t) param->ready.token; |
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return autofs_wait_release(sbi, token, 0); |
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} |
|
|
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/* |
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* Send "fail" status for an existing wait (either a mount or an expire |
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* request). |
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*/ |
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static int autofs_dev_ioctl_fail(struct file *fp, |
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struct autofs_sb_info *sbi, |
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struct autofs_dev_ioctl *param) |
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{ |
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autofs_wqt_t token; |
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int status; |
|
|
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token = (autofs_wqt_t) param->fail.token; |
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status = param->fail.status < 0 ? param->fail.status : -ENOENT; |
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return autofs_wait_release(sbi, token, status); |
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} |
|
|
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/* |
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* Set the pipe fd for kernel communication to the daemon. |
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* |
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* 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). |
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*/ |
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static int autofs_dev_ioctl_setpipefd(struct file *fp, |
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struct autofs_sb_info *sbi, |
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struct autofs_dev_ioctl *param) |
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{ |
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int pipefd; |
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int err = 0; |
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struct pid *new_pid = NULL; |
|
|
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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); |
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if (!(sbi->flags & AUTOFS_SBI_CATATONIC)) { |
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mutex_unlock(&sbi->wq_mutex); |
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return -EBUSY; |
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} else { |
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struct file *pipe; |
|
|
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new_pid = get_task_pid(current, PIDTYPE_PGID); |
|
|
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if (ns_of_pid(new_pid) != ns_of_pid(sbi->oz_pgrp)) { |
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pr_warn("not allowed to change PID namespace\n"); |
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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); |
|
}
|
|
|