Commit 203f4500 authored Dec 19, 2017 by Jan Engelhardt Committed by Herbert Xu Dec 22, 2017

crypto: n2 - cure use after free



queue_cache_init is first called for the Control Word Queue
(n2_crypto_probe). At that time, queue_cache[0] is NULL and a new
kmem_cache will be allocated. If the subsequent n2_register_algs call
fails, the kmem_cache will be released in queue_cache_destroy, but
queue_cache_init[0] is not set back to NULL.

So when the Module Arithmetic Unit gets probed next (n2_mau_probe),
queue_cache_init will not allocate a kmem_cache again, but leave it
as its bogus value, causing a BUG() to trigger when queue_cache[0] is
eventually passed to kmem_cache_zalloc:

	n2_crypto: Found N2CP at /virtual-devices@100/n2cp@7
	n2_crypto: Registered NCS HVAPI version 2.0
	called queue_cache_init
	n2_crypto: md5 alg registration failed
	n2cp f028687c: /virtual-devices@100/n2cp@7: Unable to register algorithms.
	called queue_cache_destroy
	n2cp: probe of f028687c failed with error -22
	n2_crypto: Found NCP at /virtual-devices@100/ncp@6
	n2_crypto: Registered NCS HVAPI version 2.0
	called queue_cache_init
	kernel BUG at mm/slab.c:2993!
	Call Trace:
	 [0000000000604488] kmem_cache_alloc+0x1a8/0x1e0
                  (inlined) kmem_cache_zalloc
                  (inlined) new_queue
                  (inlined) spu_queue_setup
                  (inlined) handle_exec_unit
	 [0000000010c61eb4] spu_mdesc_scan+0x1f4/0x460 [n2_crypto]
	 [0000000010c62b80] n2_mau_probe+0x100/0x220 [n2_crypto]
	 [000000000084b174] platform_drv_probe+0x34/0xc0

Cc: <stable@vger.kernel.org>
Signed-off-by: Jan Engelhardt <jengelh@inai.de>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

parent af955bf1

drivers/crypto/n2_core.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -1625,6 +1625,7 @@ static int queue_cache_init(void)
		CWQ_ENTRY_SIZE, 0, NULL);
		if (!queue_cache[HV_NCS_QTYPE_CWQ - 1]) {
		kmem_cache_destroy(queue_cache[HV_NCS_QTYPE_MAU - 1]);
		queue_cache[HV_NCS_QTYPE_MAU - 1] = NULL;
		return -ENOMEM;
		}
		return 0;
		@@ -1634,6 +1635,8 @@ static void queue_cache_destroy(void)
		{
		kmem_cache_destroy(queue_cache[HV_NCS_QTYPE_MAU - 1]);
		kmem_cache_destroy(queue_cache[HV_NCS_QTYPE_CWQ - 1]);
		queue_cache[HV_NCS_QTYPE_MAU - 1] = NULL;
		queue_cache[HV_NCS_QTYPE_CWQ - 1] = NULL;
		}

		static long spu_queue_register_workfn(void *arg)