ioctls/autofs.c

   1 #include <linux/limits.h>
   2 #include <linux/auto_fs4.h>
   3
   4 #include "ioctls.h"
   5 #include "maps.h"
   6 #include "random.h"
   7 #include "sanitise.h"
   8 #include "shm.h"
   9 #include "utils.h"
  10
  11 /* include/linux/auto_dev-ioctl.h */
  12 /*
  13  * Copyright 2008 Red Hat, Inc. All rights reserved.
  14  * Copyright 2008 Ian Kent <raven@themaw.net>
  15  *
  16  * This file is part of the Linux kernel and is made available under
  17  * the terms of the GNU General Public License, version 2, or at your
  18  * option, any later version, incorporated herein by reference.
  19  */
  20
  21 #include <string.h>
  22
  23 #define AUTOFS_DEVICE_NAME              "autofs"
  24
  25 #define AUTOFS_DEV_IOCTL_VERSION_MAJOR  1
  26 #define AUTOFS_DEV_IOCTL_VERSION_MINOR  0
  27
  28 #define AUTOFS_DEVID_LEN                16
  29
  30 #define AUTOFS_DEV_IOCTL_SIZE           sizeof(struct autofs_dev_ioctl)
  31
  32 /*
  33  * An ioctl interface for autofs mount point control.
  34  */
  35
  36 struct args_protover {
  37         __u32   version;
  38 };
  39
  40 struct args_protosubver {
  41         __u32   sub_version;
  42 };
  43
  44 struct args_openmount {
  45         __u32   devid;
  46 };
  47
  48 struct args_ready {
  49         __u32   token;
  50 };
  51
  52 struct args_fail {
  53         __u32   token;
  54         __s32   status;
  55 };
  56
  57 struct args_setpipefd {
  58         __s32   pipefd;
  59 };
  60
  61 struct args_timeout {
  62         __u64   timeout;
  63 };
  64
  65 struct args_requester {
  66         __u32   uid;
  67         __u32   gid;
  68 };
  69
  70 struct args_expire {
  71         __u32   how;
  72 };
  73
  74 struct args_askumount {
  75         __u32   may_umount;
  76 };
  77
  78 struct args_ismountpoint {
  79         union {
  80                 struct args_in {
  81                         __u32   type;
  82                 } in;
  83                 struct args_out {
  84                         __u32   devid;
  85                         __u32   magic;
  86                 } out;
  87         };
  88 };
  89
  90 /*
  91  * All the ioctls use this structure.
  92  * When sending a path size must account for the total length
  93  * of the chunk of memory otherwise is is the size of the
  94  * structure.
  95  */
  96
  97 struct autofs_dev_ioctl {
  98         __u32 ver_major;
  99         __u32 ver_minor;
 100         __u32 size;             /* total size of data passed in
 101                                  * including this struct */
 102         __s32 ioctlfd;          /* automount command fd */
 103
 104         /* Command parameters */
 105
 106         union {
 107                 struct args_protover            protover;
 108                 struct args_protosubver         protosubver;
 109                 struct args_openmount           openmount;
 110                 struct args_ready               ready;
 111                 struct args_fail                fail;
 112                 struct args_setpipefd           setpipefd;
 113                 struct args_timeout             timeout;
 114                 struct args_requester           requester;
 115                 struct args_expire              expire;
 116                 struct args_askumount           askumount;
 117                 struct args_ismountpoint        ismountpoint;
 118         };
 119
 120         char path[0];
 121 };
 122
 123 static inline void init_autofs_dev_ioctl(struct autofs_dev_ioctl *in)
 124 {
 125         memset(in, 0, sizeof(struct autofs_dev_ioctl));
 126         in->ver_major = AUTOFS_DEV_IOCTL_VERSION_MAJOR;
 127         in->ver_minor = AUTOFS_DEV_IOCTL_VERSION_MINOR;
 128         in->size = sizeof(struct autofs_dev_ioctl);
 129         in->ioctlfd = -1;
 130         return;
 131 }
 132
 133 /*
 134  * If you change this make sure you make the corresponding change
 135  * to autofs-dev-ioctl.c:lookup_ioctl()
 136  */
 137 enum {
 138         /* Get various version info */
 139         AUTOFS_DEV_IOCTL_VERSION_CMD = 0x71,
 140         AUTOFS_DEV_IOCTL_PROTOVER_CMD,
 141         AUTOFS_DEV_IOCTL_PROTOSUBVER_CMD,
 142
 143         /* Open mount ioctl fd */
 144         AUTOFS_DEV_IOCTL_OPENMOUNT_CMD,
 145
 146         /* Close mount ioctl fd */
 147         AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD,
 148
 149         /* Mount/expire status returns */
 150         AUTOFS_DEV_IOCTL_READY_CMD,
 151         AUTOFS_DEV_IOCTL_FAIL_CMD,
 152
 153         /* Activate/deactivate autofs mount */
 154         AUTOFS_DEV_IOCTL_SETPIPEFD_CMD,
 155         AUTOFS_DEV_IOCTL_CATATONIC_CMD,
 156
 157         /* Expiry timeout */
 158         AUTOFS_DEV_IOCTL_TIMEOUT_CMD,
 159
 160         /* Get mount last requesting uid and gid */
 161         AUTOFS_DEV_IOCTL_REQUESTER_CMD,
 162
 163         /* Check for eligible expire candidates */
 164         AUTOFS_DEV_IOCTL_EXPIRE_CMD,
 165
 166         /* Request busy status */
 167         AUTOFS_DEV_IOCTL_ASKUMOUNT_CMD,
 168
 169         /* Check if path is a mountpoint */
 170         AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD,
 171 };
 172
 173 #define AUTOFS_IOCTL 0x93
 174
 175 #define AUTOFS_DEV_IOCTL_VERSION \
 176         _IOWR(AUTOFS_IOCTL, \
 177               AUTOFS_DEV_IOCTL_VERSION_CMD, struct autofs_dev_ioctl)
 178
 179 #define AUTOFS_DEV_IOCTL_PROTOVER \
 180         _IOWR(AUTOFS_IOCTL, \
 181               AUTOFS_DEV_IOCTL_PROTOVER_CMD, struct autofs_dev_ioctl)
 182
 183 #define AUTOFS_DEV_IOCTL_PROTOSUBVER \
 184         _IOWR(AUTOFS_IOCTL, \
 185               AUTOFS_DEV_IOCTL_PROTOSUBVER_CMD, struct autofs_dev_ioctl)
 186
 187 #define AUTOFS_DEV_IOCTL_OPENMOUNT \
 188         _IOWR(AUTOFS_IOCTL, \
 189               AUTOFS_DEV_IOCTL_OPENMOUNT_CMD, struct autofs_dev_ioctl)
 190
 191 #define AUTOFS_DEV_IOCTL_CLOSEMOUNT \
 192         _IOWR(AUTOFS_IOCTL, \
 193               AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD, struct autofs_dev_ioctl)
 194
 195 #define AUTOFS_DEV_IOCTL_READY \
 196         _IOWR(AUTOFS_IOCTL, \
 197               AUTOFS_DEV_IOCTL_READY_CMD, struct autofs_dev_ioctl)
 198
 199 #define AUTOFS_DEV_IOCTL_FAIL \
 200         _IOWR(AUTOFS_IOCTL, \
 201               AUTOFS_DEV_IOCTL_FAIL_CMD, struct autofs_dev_ioctl)
 202
 203 #define AUTOFS_DEV_IOCTL_SETPIPEFD \
 204         _IOWR(AUTOFS_IOCTL, \
 205               AUTOFS_DEV_IOCTL_SETPIPEFD_CMD, struct autofs_dev_ioctl)
 206
 207 #define AUTOFS_DEV_IOCTL_CATATONIC \
 208         _IOWR(AUTOFS_IOCTL, \
 209               AUTOFS_DEV_IOCTL_CATATONIC_CMD, struct autofs_dev_ioctl)
 210
 211 #define AUTOFS_DEV_IOCTL_TIMEOUT \
 212         _IOWR(AUTOFS_IOCTL, \
 213               AUTOFS_DEV_IOCTL_TIMEOUT_CMD, struct autofs_dev_ioctl)
 214
 215 #define AUTOFS_DEV_IOCTL_REQUESTER \
 216         _IOWR(AUTOFS_IOCTL, \
 217               AUTOFS_DEV_IOCTL_REQUESTER_CMD, struct autofs_dev_ioctl)
 218
 219 #define AUTOFS_DEV_IOCTL_EXPIRE \
 220         _IOWR(AUTOFS_IOCTL, \
 221               AUTOFS_DEV_IOCTL_EXPIRE_CMD, struct autofs_dev_ioctl)
 222
 223 #define AUTOFS_DEV_IOCTL_ASKUMOUNT \
 224         _IOWR(AUTOFS_IOCTL, \
 225               AUTOFS_DEV_IOCTL_ASKUMOUNT_CMD, struct autofs_dev_ioctl)
 226
 227 #define AUTOFS_DEV_IOCTL_ISMOUNTPOINT \
 228         _IOWR(AUTOFS_IOCTL, \
 229               AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD, struct autofs_dev_ioctl)
 230
 231 static const struct ioctl autofs_ioctls[] = {
 232         IOCTL(AUTOFS_IOC_READY),
 233         IOCTL(AUTOFS_IOC_FAIL),
 234         IOCTL(AUTOFS_IOC_CATATONIC),
 235         IOCTL(AUTOFS_IOC_PROTOVER),
 236         /* IOCTL(AUTOFS_IOC_SETTIMEOUT32), */
 237         IOCTL(AUTOFS_IOC_SETTIMEOUT),
 238         IOCTL(AUTOFS_IOC_EXPIRE),
 239         IOCTL(AUTOFS_IOC_EXPIRE_MULTI),
 240         IOCTL(AUTOFS_IOC_EXPIRE_INDIRECT),
 241         IOCTL(AUTOFS_IOC_EXPIRE_DIRECT),
 242         IOCTL(AUTOFS_IOC_PROTOSUBVER),
 243         IOCTL(AUTOFS_IOC_ASKUMOUNT),
 244
 245         IOCTL(AUTOFS_DEV_IOCTL_VERSION),
 246         IOCTL(AUTOFS_DEV_IOCTL_PROTOVER),
 247         IOCTL(AUTOFS_DEV_IOCTL_PROTOSUBVER),
 248         IOCTL(AUTOFS_DEV_IOCTL_OPENMOUNT),
 249         IOCTL(AUTOFS_DEV_IOCTL_CLOSEMOUNT),
 250         IOCTL(AUTOFS_DEV_IOCTL_READY),
 251         IOCTL(AUTOFS_DEV_IOCTL_FAIL),
 252         IOCTL(AUTOFS_DEV_IOCTL_SETPIPEFD),
 253         IOCTL(AUTOFS_DEV_IOCTL_CATATONIC),
 254         IOCTL(AUTOFS_DEV_IOCTL_TIMEOUT),
 255         IOCTL(AUTOFS_DEV_IOCTL_REQUESTER),
 256         IOCTL(AUTOFS_DEV_IOCTL_EXPIRE),
 257         IOCTL(AUTOFS_DEV_IOCTL_ASKUMOUNT),
 258         IOCTL(AUTOFS_DEV_IOCTL_ISMOUNTPOINT),
 259 };
 260
 261 static const char *const autofs_devs[] = {
 262         "autofs",
 263 };
 264
 265 static void autofs_sanitise(const struct ioctl_group *grp, int childno)
 266 {
 267         struct autofs_dev_ioctl *arg;
 268
 269         pick_random_ioctl(grp, childno);
 270
 271         shm->syscall[childno].a3 = (unsigned long) page_rand;
 272
 273         switch (shm->syscall[childno].a2) {
 274         case AUTOFS_DEV_IOCTL_VERSION:
 275         case AUTOFS_DEV_IOCTL_PROTOVER:
 276         case AUTOFS_DEV_IOCTL_PROTOSUBVER:
 277         case AUTOFS_DEV_IOCTL_OPENMOUNT:
 278         case AUTOFS_DEV_IOCTL_CLOSEMOUNT:
 279         case AUTOFS_DEV_IOCTL_READY:
 280         case AUTOFS_DEV_IOCTL_FAIL:
 281         case AUTOFS_DEV_IOCTL_SETPIPEFD:
 282         case AUTOFS_DEV_IOCTL_CATATONIC:
 283         case AUTOFS_DEV_IOCTL_TIMEOUT:
 284         case AUTOFS_DEV_IOCTL_REQUESTER:
 285         case AUTOFS_DEV_IOCTL_EXPIRE:
 286         case AUTOFS_DEV_IOCTL_ASKUMOUNT:
 287         case AUTOFS_DEV_IOCTL_ISMOUNTPOINT:
 288                 arg = (struct autofs_dev_ioctl *)shm->syscall[childno].a3;
 289                 init_autofs_dev_ioctl(arg);
 290                 arg->ioctlfd = get_random_fd();
 291                 arg->fail.token = rand();
 292                 arg->fail.status = rand();
 293                 if (rand_bool()) {
 294                         arg->size += 5;
 295                         arg->path[0] = '/';
 296                         arg->path[1] = rand();
 297                         arg->path[2] = rand();
 298                         arg->path[3] = rand();
 299                         arg->path[4] = 0;
 300                 } else {
 301                         int i;
 302
 303                         arg->size += rand();
 304                         for (i=0; i < 10; ++i)
 305                                 arg->path[i] = rand();
 306                 }
 307                 break;
 308         default:
 309                 break;
 310         }
 311 }
 312
 313 static const struct ioctl_group autofs_grp = {
 314         .devtype = DEV_MISC,
 315         .devs = autofs_devs,
 316         .devs_cnt = ARRAY_SIZE(autofs_devs),
 317         .sanitise = autofs_sanitise,
 318         .ioctls = autofs_ioctls,
 319         .ioctls_cnt = ARRAY_SIZE(autofs_ioctls),
 320 };
 321
 322 REG_IOCTL_GROUP(autofs_grp)