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rbd: harden get_lock_owner_info() a bit

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commit 8ff2c64c97 upstream.

- we want the exclusive lock type, so test for it directly
- use sscanf() to actually parse the lock cookie and avoid admitting
  invalid handles
- bail if locker has a blank address

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Dongsheng Yang <dongsheng.yang@easystack.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ilya Dryomov 2023-07-08 16:16:59 +02:00 • committed by Justin Hammond
parent 6abf3651ac
commit 5592d90027
2 changed files with 16 additions and 6 deletions
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21
drivers/block/rbd.c
View file

@ -3864,10 +3864,9 @@ static struct ceph_locker *get_lock_owner_info(struct rbd_device *rbd_dev)
u32 num_lockers;
u8 lock_type;
char *lock_tag;
u64 handle;
int ret;
dout("%s rbd_dev %p\n", __func__, rbd_dev);
ret = ceph_cls_lock_info(osdc, &rbd_dev->header_oid,
&rbd_dev->header_oloc, RBD_LOCK_NAME,
&lock_type, &lock_tag, &lockers, &num_lockers);
@ -3888,18 +3887,28 @@ static struct ceph_locker *get_lock_owner_info(struct rbd_device *rbd_dev)
goto err_busy;
}
if (lock_type == CEPH_CLS_LOCK_SHARED) {
rbd_warn(rbd_dev, "shared lock type detected");
if (lock_type != CEPH_CLS_LOCK_EXCLUSIVE) {
rbd_warn(rbd_dev, "incompatible lock type detected");
goto err_busy;
}
WARN_ON(num_lockers != 1);
if (strncmp(lockers[0].id.cookie, RBD_LOCK_COOKIE_PREFIX,
strlen(RBD_LOCK_COOKIE_PREFIX))) {
ret = sscanf(lockers[0].id.cookie, RBD_LOCK_COOKIE_PREFIX " %llu",
&handle);
if (ret != 1) {
rbd_warn(rbd_dev, "locked by external mechanism, cookie %s",
lockers[0].id.cookie);
goto err_busy;
}
if (ceph_addr_is_blank(&lockers[0].info.addr)) {
rbd_warn(rbd_dev, "locker has a blank address");
goto err_busy;
}
dout("%s rbd_dev %p got locker %s%llu@%pISpc/%u handle %llu\n",
__func__, rbd_dev, ENTITY_NAME(lockers[0].id.name),
&lockers[0].info.addr.in_addr,
le32_to_cpu(lockers[0].info.addr.nonce), handle);
out:
kfree(lock_tag);

1
net/ceph/messenger.c
View file

@ -1144,6 +1144,7 @@ bool ceph_addr_is_blank(const struct ceph_entity_addr *addr)
return true;
}
}
EXPORT_SYMBOL(ceph_addr_is_blank);
int ceph_addr_port(const struct ceph_entity_addr *addr)
{