This is a note to let you know that I've just added the patch titled
dm: fix a race condition in retrieve_deps
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dm-fix-a-race-condition-in-retrieve_deps.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 59253695e326ac0138f09a58dd72e3f07f70b4a2
Author: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Date: Wed Aug 9 12:44:20 2023 +0200
dm: fix a race condition in retrieve_deps
[ Upstream commit f6007dce0cd35d634d9be91ef3515a6385dcee16 ]
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@xxxxxxxxxx>
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Tested-by: Li Lingfeng <lilingfeng3@xxxxxxxxxx>
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/md/dm-core.h b/drivers/md/dm-core.h
index 28c641352de9b..71dcd8fd4050a 100644
--- a/drivers/md/dm-core.h
+++ b/drivers/md/dm-core.h
@@ -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 *);
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index 2afd2d2a0f407..206e6ce554dc7 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -1566,6 +1566,8 @@ 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);
/*
@@ -1580,7 +1582,7 @@ 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;
}
/*
@@ -1592,6 +1594,9 @@ 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)
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 288f600ee56dc..dac6a5f25f2be 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -134,6 +134,7 @@ int dm_table_create(struct dm_table **result, fmode_t mode,
return -ENOMEM;
INIT_LIST_HEAD(&t->devices);
+ init_rwsem(&t->devices_lock);
if (!num_targets)
num_targets = KEYS_PER_NODE;
@@ -362,15 +363,19 @@ int dm_get_device(struct dm_target *ti, const char *path, fmode_t mode,
return -ENODEV;
}
+ 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;
+ }
if ((r = dm_get_table_device(t->md, dev, mode, &dd->dm_dev))) {
kfree(dd);
- return r;
+ goto unlock_ret_r;
}
refcount_set(&dd->count, 1);
@@ -380,12 +385,17 @@ int dm_get_device(struct dm_target *ti, const char *path, fmode_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);
@@ -421,9 +431,12 @@ 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;
@@ -432,14 +445,17 @@ 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);
--
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