dm ioctl: fix alignment of event number in the device list

commit 62e082430ea4bb5b28909ca4375bb683931e22aa upstream.

The size of struct dm_name_list is different on 32-bit and 64-bit
kernels (so "(nl + 1)" differs between 32-bit and 64-bit kernels).

This mismatch caused some harmless difference in padding when using 32-bit
or 64-bit kernel. Commit 23d70c5e52dd ("dm ioctl: report event number in
DM_LIST_DEVICES") added reporting event number in the output of
DM_LIST_DEVICES_CMD. This difference in padding makes it impossible for
userspace to determine the location of the event number (the location
would be different when running on 32-bit and 64-bit kernels).

Fix the padding by using offsetof(struct dm_name_list, name) instead of
sizeof(struct dm_name_list) to determine the location of entries.

Also, the ioctl version number is incremented to 37 so that userspace
can use the version number to determine that the event number is present
and correctly located.

In addition, a global event is now raised when a DM device is created,
removed, renamed or when table is swapped, so that the user can monitor
for device changes.

Reported-by: Eugene Syromiatnikov <esyr@redhat.com>
Fixes: 23d70c5e52dd ("dm ioctl: report event number in DM_LIST_DEVICES")
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/md/dm-core.h b/drivers/md/dm-core.h
index 24eddbdf2ab4cb9437674a3783ffbbfaca8a21fd..203144762f3688ab118ccd2e865df3c427b4dca5 100644 (file)
--- a/drivers/md/dm-core.h
+++ b/drivers/md/dm-core.h
@@ -149,5 +149,6 @@ static inline bool dm_message_test_buffer_overflow(char *result, unsigned maxlen
 
 extern atomic_t dm_global_event_nr;
 extern wait_queue_head_t dm_global_eventq;
+void dm_issue_global_event(void);
 
 #endif

diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index e06f0ef7d2ecf2b12beb1d13b6ae2f35580be885..e9f9884b66a8c6ca8032d12894d128aeff789c50 100644 (file)
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -477,9 +477,13 @@ static int remove_all(struct file *filp, struct dm_ioctl *param, size_t param_si
  * Round up the ptr to an 8-byte boundary.
  */
 #define ALIGN_MASK 7
+static inline size_t align_val(size_t val)
+{
+       return (val + ALIGN_MASK) & ~ALIGN_MASK;
+}
 static inline void *align_ptr(void *ptr)
 {
-       return (void *) (((size_t) (ptr + ALIGN_MASK)) & ~ALIGN_MASK);
+       return (void *)align_val((size_t)ptr);
 }
 
 /*
@@ -505,7 +509,7 @@ static int list_devices(struct file *filp, struct dm_ioctl *param, size_t param_
        struct hash_cell *hc;
        size_t len, needed = 0;
        struct gendisk *disk;
-       struct dm_name_list *nl, *old_nl = NULL;
+       struct dm_name_list *orig_nl, *nl, *old_nl = NULL;
        uint32_t *event_nr;
 
        down_write(&_hash_lock);
@@ -516,17 +520,15 @@ static int list_devices(struct file *filp, struct dm_ioctl *param, size_t param_
         */
        for (i = 0; i < NUM_BUCKETS; i++) {
                list_for_each_entry (hc, _name_buckets + i, name_list) {
-                       needed += sizeof(struct dm_name_list);
-                       needed += strlen(hc->name) + 1;
-                       needed += ALIGN_MASK;
-                       needed += (sizeof(uint32_t) + ALIGN_MASK) & ~ALIGN_MASK;
+                       needed += align_val(offsetof(struct dm_name_list, name) + strlen(hc->name) + 1);
+                       needed += align_val(sizeof(uint32_t));
                }
        }
 
        /*
         * Grab our output buffer.
         */
-       nl = get_result_buffer(param, param_size, &len);
+       nl = orig_nl = get_result_buffer(param, param_size, &len);
        if (len < needed) {
                param->flags |= DM_BUFFER_FULL_FLAG;
                goto out;
@@ -549,11 +551,16 @@ static int list_devices(struct file *filp, struct dm_ioctl *param, size_t param_
                        strcpy(nl->name, hc->name);
 
                        old_nl = nl;
-                       event_nr = align_ptr(((void *) (nl + 1)) + strlen(hc->name) + 1);
+                       event_nr = align_ptr(nl->name + strlen(hc->name) + 1);
                        *event_nr = dm_get_event_nr(hc->md);
                        nl = align_ptr(event_nr + 1);
                }
        }
+       /*
+        * If mismatch happens, security may be compromised due to buffer
+        * overflow, so it's better to crash.
+        */
+       BUG_ON((char *)nl - (char *)orig_nl != needed);
 
  out:
        up_write(&_hash_lock);
@@ -1621,7 +1628,8 @@ static int target_message(struct file *filp, struct dm_ioctl *param, size_t para
  * which has a variable size, is not used by the function processing
  * the ioctl.
  */
-#define IOCTL_FLAGS_NO_PARAMS  1
+#define IOCTL_FLAGS_NO_PARAMS          1
+#define IOCTL_FLAGS_ISSUE_GLOBAL_EVENT 2
 
 /*-----------------------------------------------------------------
  * Implementation of open/close/ioctl on the special char
@@ -1635,12 +1643,12 @@ static ioctl_fn lookup_ioctl(unsigned int cmd, int *ioctl_flags)
                ioctl_fn fn;
        } _ioctls[] = {
                {DM_VERSION_CMD, 0, NULL}, /* version is dealt with elsewhere */
-               {DM_REMOVE_ALL_CMD, IOCTL_FLAGS_NO_PARAMS, remove_all},
+               {DM_REMOVE_ALL_CMD, IOCTL_FLAGS_NO_PARAMS | IOCTL_FLAGS_ISSUE_GLOBAL_EVENT, remove_all},
                {DM_LIST_DEVICES_CMD, 0, list_devices},
 
-               {DM_DEV_CREATE_CMD, IOCTL_FLAGS_NO_PARAMS, dev_create},
-               {DM_DEV_REMOVE_CMD, IOCTL_FLAGS_NO_PARAMS, dev_remove},
-               {DM_DEV_RENAME_CMD, 0, dev_rename},
+               {DM_DEV_CREATE_CMD, IOCTL_FLAGS_NO_PARAMS | IOCTL_FLAGS_ISSUE_GLOBAL_EVENT, dev_create},
+               {DM_DEV_REMOVE_CMD, IOCTL_FLAGS_NO_PARAMS | IOCTL_FLAGS_ISSUE_GLOBAL_EVENT, dev_remove},
+               {DM_DEV_RENAME_CMD, IOCTL_FLAGS_ISSUE_GLOBAL_EVENT, dev_rename},
                {DM_DEV_SUSPEND_CMD, IOCTL_FLAGS_NO_PARAMS, dev_suspend},
                {DM_DEV_STATUS_CMD, IOCTL_FLAGS_NO_PARAMS, dev_status},
                {DM_DEV_WAIT_CMD, 0, dev_wait},
@@ -1869,6 +1877,9 @@ static int ctl_ioctl(struct file *file, uint command, struct dm_ioctl __user *us
            unlikely(ioctl_flags & IOCTL_FLAGS_NO_PARAMS))
                DMERR("ioctl %d tried to output some data but has IOCTL_FLAGS_NO_PARAMS set", cmd);
 
+       if (!r && ioctl_flags & IOCTL_FLAGS_ISSUE_GLOBAL_EVENT)
+               dm_issue_global_event();
+
        /*
         * Copy the results back to userland.
         */

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 825eaffc24da9706152e092cf074678e743fc743..eed539a4eec258d0f3b5f50f7fe32d524f7e715f 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -52,6 +52,12 @@ static struct workqueue_struct *deferred_remove_workqueue;
 atomic_t dm_global_event_nr = ATOMIC_INIT(0);
 DECLARE_WAIT_QUEUE_HEAD(dm_global_eventq);
 
+void dm_issue_global_event(void)
+{
+       atomic_inc(&dm_global_event_nr);
+       wake_up(&dm_global_eventq);
+}
+
 /*
  * One of these is allocated per bio.
  */
@@ -1865,9 +1871,8 @@ static void event_callback(void *context)
        dm_send_uevents(&uevents, &disk_to_dev(md->disk)->kobj);
 
        atomic_inc(&md->event_nr);
-       atomic_inc(&dm_global_event_nr);
        wake_up(&md->eventq);
-       wake_up(&dm_global_eventq);
+       dm_issue_global_event();
 }
 
 /*
@@ -2283,6 +2288,7 @@ struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table)
        }
 
        map = __bind(md, table, &limits);
+       dm_issue_global_event();
 
 out:
        mutex_unlock(&md->suspend_lock);

diff --git a/include/uapi/linux/dm-ioctl.h b/include/uapi/linux/dm-ioctl.h
index 412c06a624c83674e02f1d6669c4201d2a6c6e1b..ccaea525340b9d857a9f4fe8a5834def9c9367be 100644 (file)
--- a/include/uapi/linux/dm-ioctl.h
+++ b/include/uapi/linux/dm-ioctl.h
@@ -269,9 +269,9 @@ enum {
 #define DM_DEV_SET_GEOMETRY    _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
 
 #define DM_VERSION_MAJOR       4
-#define DM_VERSION_MINOR       36
+#define DM_VERSION_MINOR       37
 #define DM_VERSION_PATCHLEVEL  0
-#define DM_VERSION_EXTRA       "-ioctl (2017-06-09)"
+#define DM_VERSION_EXTRA       "-ioctl (2017-09-20)"
 
 /* Status bits */
 #define DM_READONLY_FLAG       (1 << 0) /* In/Out */