^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright 2008 Red Hat, Inc. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright 2008 Ian Kent <raven@themaw.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/miscdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/syscalls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/magic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/nospec.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include "autofs_i.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * This module implements an interface for routing autofs ioctl control
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * commands via a miscellaneous device file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * The alternate interface is needed because we need to be able open
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * an ioctl file descriptor on an autofs mount that may be covered by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * another mount. This situation arises when starting automount(8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * or other user space daemon which uses direct mounts or offset
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * mounts (used for autofs lazy mount/umount of nested mount trees),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * which have been left busy at service shutdown.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) typedef int (*ioctl_fn)(struct file *, struct autofs_sb_info *,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) struct autofs_dev_ioctl *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static int check_name(const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) if (!strchr(name, '/'))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * Check a string doesn't overrun the chunk of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) * memory we copied from user land.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) static int invalid_str(char *str, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) if (memchr(str, 0, size))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) * Check that the user compiled against correct version of autofs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * misc device code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * As well as checking the version compatibility this always copies
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * the kernel interface version out.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static int check_dev_ioctl_version(int cmd, struct autofs_dev_ioctl *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) if ((param->ver_major != AUTOFS_DEV_IOCTL_VERSION_MAJOR) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) (param->ver_minor > AUTOFS_DEV_IOCTL_VERSION_MINOR)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) pr_warn("ioctl control interface version mismatch: "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) "kernel(%u.%u), user(%u.%u), cmd(0x%08x)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) AUTOFS_DEV_IOCTL_VERSION_MAJOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) AUTOFS_DEV_IOCTL_VERSION_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) param->ver_major, param->ver_minor, cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /* Fill in the kernel version. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) param->ver_major = AUTOFS_DEV_IOCTL_VERSION_MAJOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) param->ver_minor = AUTOFS_DEV_IOCTL_VERSION_MINOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * Copy parameter control struct, including a possible path allocated
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * at the end of the struct.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) static struct autofs_dev_ioctl *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) copy_dev_ioctl(struct autofs_dev_ioctl __user *in)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct autofs_dev_ioctl tmp, *res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) if (copy_from_user(&tmp, in, AUTOFS_DEV_IOCTL_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return ERR_PTR(-EFAULT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (tmp.size < AUTOFS_DEV_IOCTL_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (tmp.size > AUTOFS_DEV_IOCTL_SIZE + PATH_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return ERR_PTR(-ENAMETOOLONG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) res = memdup_user(in, tmp.size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (!IS_ERR(res))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) res->size = tmp.size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) static inline void free_dev_ioctl(struct autofs_dev_ioctl *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) kfree(param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) * Check sanity of parameter control fields and if a path is present
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) * check that it is terminated and contains at least one "/".
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) static int validate_dev_ioctl(int cmd, struct autofs_dev_ioctl *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) err = check_dev_ioctl_version(cmd, param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) pr_warn("invalid device control module version "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) "supplied for cmd(0x%08x)\n", cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) if (param->size > AUTOFS_DEV_IOCTL_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) err = invalid_str(param->path, param->size - AUTOFS_DEV_IOCTL_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) pr_warn(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) "path string terminator missing for cmd(0x%08x)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) err = check_name(param->path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) pr_warn("invalid path supplied for cmd(0x%08x)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) unsigned int inr = _IOC_NR(cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if (inr == AUTOFS_DEV_IOCTL_OPENMOUNT_CMD ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) inr == AUTOFS_DEV_IOCTL_REQUESTER_CMD ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) inr == AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) /* Return autofs dev ioctl version */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static int autofs_dev_ioctl_version(struct file *fp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) struct autofs_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) struct autofs_dev_ioctl *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) /* This should have already been set. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) param->ver_major = AUTOFS_DEV_IOCTL_VERSION_MAJOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) param->ver_minor = AUTOFS_DEV_IOCTL_VERSION_MINOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) /* Return autofs module protocol version */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) static int autofs_dev_ioctl_protover(struct file *fp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) struct autofs_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) struct autofs_dev_ioctl *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) param->protover.version = sbi->version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) /* Return autofs module protocol sub version */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) static int autofs_dev_ioctl_protosubver(struct file *fp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) struct autofs_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) struct autofs_dev_ioctl *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) param->protosubver.sub_version = sbi->sub_version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) /* Find the topmost mount satisfying test() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) static int find_autofs_mount(const char *pathname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) struct path *res,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) int test(const struct path *path, void *data),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) struct path path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) err = kern_path(pathname, LOOKUP_MOUNTPOINT, &path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) err = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) while (path.dentry == path.mnt->mnt_root) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) if (path.dentry->d_sb->s_magic == AUTOFS_SUPER_MAGIC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) if (test(&path, data)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) path_get(&path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) *res = path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) if (!follow_up(&path))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) path_put(&path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) static int test_by_dev(const struct path *path, void *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) return path->dentry->d_sb->s_dev == *(dev_t *)p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) static int test_by_type(const struct path *path, void *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) struct autofs_info *ino = autofs_dentry_ino(path->dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) return ino && ino->sbi->type & *(unsigned *)p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) * Open a file descriptor on the autofs mount point corresponding
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) * to the given path and device number (aka. new_encode_dev(sb->s_dev)).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) static int autofs_dev_ioctl_open_mountpoint(const char *name, dev_t devid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) int err, fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) fd = get_unused_fd_flags(O_CLOEXEC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) if (likely(fd >= 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) struct file *filp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) struct path path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) err = find_autofs_mount(name, &path, test_by_dev, &devid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) filp = dentry_open(&path, O_RDONLY, current_cred());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) path_put(&path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) if (IS_ERR(filp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) err = PTR_ERR(filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) fd_install(fd, filp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) return fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) put_unused_fd(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) /* Open a file descriptor on an autofs mount point */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) static int autofs_dev_ioctl_openmount(struct file *fp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) struct autofs_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) struct autofs_dev_ioctl *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) const char *path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) dev_t devid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) int err, fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) /* param->path has been checked in validate_dev_ioctl() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if (!param->openmount.devid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) param->ioctlfd = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) path = param->path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) devid = new_decode_dev(param->openmount.devid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) fd = autofs_dev_ioctl_open_mountpoint(path, devid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) if (unlikely(fd < 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) err = fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) param->ioctlfd = fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) /* Close file descriptor allocated above (user can also use close(2)). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) static int autofs_dev_ioctl_closemount(struct file *fp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) struct autofs_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) struct autofs_dev_ioctl *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) return ksys_close(param->ioctlfd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * Send "ready" status for an existing wait (either a mount or an expire
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) * request).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) static int autofs_dev_ioctl_ready(struct file *fp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) struct autofs_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) struct autofs_dev_ioctl *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) autofs_wqt_t token;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) token = (autofs_wqt_t) param->ready.token;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) return autofs_wait_release(sbi, token, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) * Send "fail" status for an existing wait (either a mount or an expire
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) * request).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) static int autofs_dev_ioctl_fail(struct file *fp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) struct autofs_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) struct autofs_dev_ioctl *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) autofs_wqt_t token;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) int status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) token = (autofs_wqt_t) param->fail.token;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) status = param->fail.status < 0 ? param->fail.status : -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) return autofs_wait_release(sbi, token, status);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) * Set the pipe fd for kernel communication to the daemon.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) * Normally this is set at mount using an option but if we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) * are reconnecting to a busy mount then we need to use this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) * to tell the autofs mount about the new kernel pipe fd. In
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) * order to protect mounts against incorrectly setting the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) * pipefd we also require that the autofs mount be catatonic.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) * This also sets the process group id used to identify the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) * controlling process (eg. the owning automount(8) daemon).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) static int autofs_dev_ioctl_setpipefd(struct file *fp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) struct autofs_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) struct autofs_dev_ioctl *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) int pipefd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) struct pid *new_pid = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) if (param->setpipefd.pipefd == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) pipefd = param->setpipefd.pipefd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) mutex_lock(&sbi->wq_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) if (!(sbi->flags & AUTOFS_SBI_CATATONIC)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) mutex_unlock(&sbi->wq_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) struct file *pipe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) new_pid = get_task_pid(current, PIDTYPE_PGID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) if (ns_of_pid(new_pid) != ns_of_pid(sbi->oz_pgrp)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) pr_warn("not allowed to change PID namespace\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) pipe = fget(pipefd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) if (!pipe) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) err = -EBADF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) if (autofs_prepare_pipe(pipe) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) err = -EPIPE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) fput(pipe);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) swap(sbi->oz_pgrp, new_pid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) sbi->pipefd = pipefd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) sbi->pipe = pipe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) sbi->flags &= ~AUTOFS_SBI_CATATONIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) put_pid(new_pid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) mutex_unlock(&sbi->wq_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) * Make the autofs mount point catatonic, no longer responsive to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) * mount requests. Also closes the kernel pipe file descriptor.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) static int autofs_dev_ioctl_catatonic(struct file *fp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) struct autofs_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) struct autofs_dev_ioctl *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) autofs_catatonic_mode(sbi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) /* Set the autofs mount timeout */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) static int autofs_dev_ioctl_timeout(struct file *fp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) struct autofs_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) struct autofs_dev_ioctl *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) unsigned long timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) timeout = param->timeout.timeout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) param->timeout.timeout = sbi->exp_timeout / HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) sbi->exp_timeout = timeout * HZ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) * Return the uid and gid of the last request for the mount
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) * When reconstructing an autofs mount tree with active mounts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) * we need to re-connect to mounts that may have used the original
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) * process uid and gid (or string variations of them) for mount
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) * lookups within the map entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) static int autofs_dev_ioctl_requester(struct file *fp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) struct autofs_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) struct autofs_dev_ioctl *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) struct autofs_info *ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) struct path path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) dev_t devid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) int err = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) /* param->path has been checked in validate_dev_ioctl() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) devid = sbi->sb->s_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) param->requester.uid = param->requester.gid = -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) err = find_autofs_mount(param->path, &path, test_by_dev, &devid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) ino = autofs_dentry_ino(path.dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) if (ino) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) autofs_expire_wait(&path, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) spin_lock(&sbi->fs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) param->requester.uid =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) from_kuid_munged(current_user_ns(), ino->uid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) param->requester.gid =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) from_kgid_munged(current_user_ns(), ino->gid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) spin_unlock(&sbi->fs_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) path_put(&path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) * Call repeatedly until it returns -EAGAIN, meaning there's nothing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) * more that can be done.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) static int autofs_dev_ioctl_expire(struct file *fp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) struct autofs_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) struct autofs_dev_ioctl *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) struct vfsmount *mnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) int how;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) how = param->expire.how;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) mnt = fp->f_path.mnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) return autofs_do_expire_multi(sbi->sb, mnt, sbi, how);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) /* Check if autofs mount point is in use */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) static int autofs_dev_ioctl_askumount(struct file *fp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) struct autofs_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) struct autofs_dev_ioctl *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) param->askumount.may_umount = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) if (may_umount(fp->f_path.mnt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) param->askumount.may_umount = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) * Check if the given path is a mountpoint.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) * If we are supplied with the file descriptor of an autofs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) * mount we're looking for a specific mount. In this case
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) * the path is considered a mountpoint if it is itself a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) * mountpoint or contains a mount, such as a multi-mount
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) * without a root mount. In this case we return 1 if the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) * path is a mount point and the super magic of the covering
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) * mount if there is one or 0 if it isn't a mountpoint.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) * If we aren't supplied with a file descriptor then we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) * lookup the path and check if it is the root of a mount.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) * If a type is given we are looking for a particular autofs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) * mount and if we don't find a match we return fail. If the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) * located path is the root of a mount we return 1 along with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) * the super magic of the mount or 0 otherwise.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) * In both cases the device number (as returned by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) * new_encode_dev()) is also returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) static int autofs_dev_ioctl_ismountpoint(struct file *fp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) struct autofs_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) struct autofs_dev_ioctl *param)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) struct path path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) const char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) unsigned int type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) unsigned int devid, magic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) int err = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) /* param->path has been checked in validate_dev_ioctl() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) name = param->path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) type = param->ismountpoint.in.type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) param->ismountpoint.out.devid = devid = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) param->ismountpoint.out.magic = magic = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) if (!fp || param->ioctlfd == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) if (autofs_type_any(type))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) err = kern_path(name, LOOKUP_FOLLOW | LOOKUP_MOUNTPOINT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) &path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) err = find_autofs_mount(name, &path,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) test_by_type, &type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) devid = new_encode_dev(path.dentry->d_sb->s_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) if (path.mnt->mnt_root == path.dentry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) err = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) magic = path.dentry->d_sb->s_magic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) dev_t dev = sbi->sb->s_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) err = find_autofs_mount(name, &path, test_by_dev, &dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) devid = new_encode_dev(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) err = path_has_submounts(&path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) if (follow_down_one(&path))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) magic = path.dentry->d_sb->s_magic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) param->ismountpoint.out.devid = devid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) param->ismountpoint.out.magic = magic;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) path_put(&path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) * Our range of ioctl numbers isn't 0 based so we need to shift
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) * the array index by _IOC_NR(AUTOFS_CTL_IOC_FIRST) for the table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) * lookup.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) #define cmd_idx(cmd) (cmd - _IOC_NR(AUTOFS_DEV_IOCTL_IOC_FIRST))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) static ioctl_fn lookup_dev_ioctl(unsigned int cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) static const ioctl_fn _ioctls[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) autofs_dev_ioctl_version,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) autofs_dev_ioctl_protover,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) autofs_dev_ioctl_protosubver,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) autofs_dev_ioctl_openmount,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) autofs_dev_ioctl_closemount,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) autofs_dev_ioctl_ready,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) autofs_dev_ioctl_fail,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) autofs_dev_ioctl_setpipefd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) autofs_dev_ioctl_catatonic,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) autofs_dev_ioctl_timeout,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) autofs_dev_ioctl_requester,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) autofs_dev_ioctl_expire,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) autofs_dev_ioctl_askumount,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) autofs_dev_ioctl_ismountpoint,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) unsigned int idx = cmd_idx(cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) if (idx >= ARRAY_SIZE(_ioctls))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) idx = array_index_nospec(idx, ARRAY_SIZE(_ioctls));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) return _ioctls[idx];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) /* ioctl dispatcher */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) static int _autofs_dev_ioctl(unsigned int command,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) struct autofs_dev_ioctl __user *user)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) struct autofs_dev_ioctl *param;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) struct file *fp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) struct autofs_sb_info *sbi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) unsigned int cmd_first, cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) ioctl_fn fn = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) cmd_first = _IOC_NR(AUTOFS_DEV_IOCTL_IOC_FIRST);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) cmd = _IOC_NR(command);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) if (_IOC_TYPE(command) != _IOC_TYPE(AUTOFS_DEV_IOCTL_IOC_FIRST) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) cmd - cmd_first > AUTOFS_DEV_IOCTL_IOC_COUNT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) return -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) /* Only root can use ioctls other than AUTOFS_DEV_IOCTL_VERSION_CMD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) * and AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) if (cmd != AUTOFS_DEV_IOCTL_VERSION_CMD &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) cmd != AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) !capable(CAP_SYS_ADMIN))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) return -EPERM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) /* Copy the parameters into kernel space. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) param = copy_dev_ioctl(user);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) if (IS_ERR(param))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) return PTR_ERR(param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) err = validate_dev_ioctl(command, param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) fn = lookup_dev_ioctl(cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) if (!fn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) pr_warn("unknown command 0x%08x\n", command);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) err = -ENOTTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) fp = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) sbi = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) * For obvious reasons the openmount can't have a file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) * descriptor yet. We don't take a reference to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) * file during close to allow for immediate release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) * and the same for retrieving ioctl version.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) if (cmd != AUTOFS_DEV_IOCTL_VERSION_CMD &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) cmd != AUTOFS_DEV_IOCTL_OPENMOUNT_CMD &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) cmd != AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) struct super_block *sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) fp = fget(param->ioctlfd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) if (!fp) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) if (cmd == AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) goto cont;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) err = -EBADF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) sb = file_inode(fp)->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) if (sb->s_type != &autofs_fs_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) fput(fp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) sbi = autofs_sbi(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) * Admin needs to be able to set the mount catatonic in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) * order to be able to perform the re-open.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) if (!autofs_oz_mode(sbi) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) cmd != AUTOFS_DEV_IOCTL_CATATONIC_CMD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) err = -EACCES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) fput(fp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) cont:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) err = fn(fp, sbi, param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) if (fp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) fput(fp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) if (err >= 0 && copy_to_user(user, param, AUTOFS_DEV_IOCTL_SIZE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) err = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) free_dev_ioctl(param);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) static long autofs_dev_ioctl(struct file *file, unsigned int command,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) unsigned long u)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) err = _autofs_dev_ioctl(command, (struct autofs_dev_ioctl __user *) u);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) return (long) err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) static long autofs_dev_ioctl_compat(struct file *file, unsigned int command,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) unsigned long u)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) return autofs_dev_ioctl(file, command, (unsigned long) compat_ptr(u));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) #define autofs_dev_ioctl_compat NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) static const struct file_operations _dev_ioctl_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) .unlocked_ioctl = autofs_dev_ioctl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) .compat_ioctl = autofs_dev_ioctl_compat,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) .llseek = noop_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) static struct miscdevice _autofs_dev_ioctl_misc = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) .minor = AUTOFS_MINOR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) .name = AUTOFS_DEVICE_NAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) .fops = &_dev_ioctl_fops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) .mode = 0644,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) MODULE_ALIAS_MISCDEV(AUTOFS_MINOR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) MODULE_ALIAS("devname:autofs");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) /* Register/deregister misc character device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) int __init autofs_dev_ioctl_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) r = misc_register(&_autofs_dev_ioctl_misc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) if (r) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) pr_err("misc_register failed for control device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) void autofs_dev_ioctl_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) misc_deregister(&_autofs_dev_ioctl_misc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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