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dm: fix a race condition in retrieve_deps

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There's a race condition in the multipath target when retrieve_deps
races with multipath_message calling dm_get_device and dm_put_device.
retrieve_deps walks the list of open devices without holding any lock
but multipath may add or remove devices to the list while it is
running. The end result may be memory corruption or use-after-free
memory access.

See this description of a UAF with multipath_message():
https://listman.redhat.com/archives/dm-devel/2022-October/052373.html

Fix this bug by introducing a new rw semaphore "devices_lock". We grab
devices_lock for read in retrieve_deps and we grab it for write in
dm_get_device and dm_put_device.

Reported-by: Luo Meng <luomeng12@huawei.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Tested-by: Li Lingfeng <lilingfeng3@huawei.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Mikulas Patocka 2023-08-09 12:44:20 +02:00 committed by Mike Snitzer
parent 0bb80ecc33
commit f6007dce0c
3 changed files with 31 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/md/dm-core.h
View File

@ -214,6 +214,7 @@ struct dm_table {
/* a list of devices used by this table */
struct list_head devices;
struct rw_semaphore devices_lock;
/* events get handed up using this callback */
void (*event_fn)(void *data);

7
drivers/md/dm-ioctl.c
View File

@ -1630,6 +1630,8 @@ static void retrieve_deps(struct dm_table *table,
struct dm_dev_internal *dd;
struct dm_target_deps *deps;
down_read(&table->devices_lock);
deps = get_result_buffer(param, param_size, &len);
/*
@ -1644,7 +1646,7 @@ static void retrieve_deps(struct dm_table *table,
needed = struct_size(deps, dev, count);
if (len < needed) {
param->flags |= DM_BUFFER_FULL_FLAG;
return;
goto out;
}
/*
@ -1656,6 +1658,9 @@ static void retrieve_deps(struct dm_table *table,
deps->dev[count++] = huge_encode_dev(dd->dm_dev->bdev->bd_dev);
param->data_size = param->data_start + needed;
out:
up_read(&table->devices_lock);
}
static int table_deps(struct file *filp, struct dm_ioctl *param, size_t param_size)

32
drivers/md/dm-table.c
View File

@ -135,6 +135,7 @@ int dm_table_create(struct dm_table **result, blk_mode_t mode,
return -ENOMEM;
INIT_LIST_HEAD(&t->devices);
init_rwsem(&t->devices_lock);
if (!num_targets)
num_targets = KEYS_PER_NODE;
@ -359,16 +360,20 @@ int __ref dm_get_device(struct dm_target *ti, const char *path, blk_mode_t mode,
if (dev == disk_devt(t->md->disk))
return -EINVAL;
down_write(&t->devices_lock);
dd = find_device(&t->devices, dev);
if (!dd) {
dd = kmalloc(sizeof(*dd), GFP_KERNEL);
if (!dd)
return -ENOMEM;
if (!dd) {
r = -ENOMEM;
goto unlock_ret_r;
}
r = dm_get_table_device(t->md, dev, mode, &dd->dm_dev);
if (r) {
kfree(dd);
return r;
goto unlock_ret_r;
}
refcount_set(&dd->count, 1);
@ -378,12 +383,17 @@ int __ref dm_get_device(struct dm_target *ti, const char *path, blk_mode_t mode,
} else if (dd->dm_dev->mode != (mode | dd->dm_dev->mode)) {
r = upgrade_mode(dd, mode, t->md);
if (r)
return r;
goto unlock_ret_r;
}
refcount_inc(&dd->count);
out:
up_write(&t->devices_lock);
*result = dd->dm_dev;
return 0;
unlock_ret_r:
up_write(&t->devices_lock);
return r;
}
EXPORT_SYMBOL(dm_get_device);
@ -419,9 +429,12 @@ static int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev,
void dm_put_device(struct dm_target *ti, struct dm_dev *d)
{
int found = 0;
struct list_head *devices = &ti->table->devices;
struct dm_table *t = ti->table;
struct list_head *devices = &t->devices;
struct dm_dev_internal *dd;
down_write(&t->devices_lock);
list_for_each_entry(dd, devices, list) {
if (dd->dm_dev == d) {
found = 1;
@ -430,14 +443,17 @@ void dm_put_device(struct dm_target *ti, struct dm_dev *d)
}
if (!found) {
DMERR("%s: device %s not in table devices list",
dm_device_name(ti->table->md), d->name);
return;
dm_device_name(t->md), d->name);
goto unlock_ret;
}
if (refcount_dec_and_test(&dd->count)) {
dm_put_table_device(ti->table->md, d);
dm_put_table_device(t->md, d);
list_del(&dd->list);
kfree(dd);
}
unlock_ret:
up_write(&t->devices_lock);
}
EXPORT_SYMBOL(dm_put_device);