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virtio-crypto: verify src&dst buffer length for sym request 

For symmetric algorithms, the length of ciphertext must be as same
as the plaintext.
The missing verification of the src_len and the dst_len in
virtio_crypto_sym_op_helper() may lead buffer overflow/divulged.

This patch is originally written by Yiming Tao for QEMU-SECURITY,
resend it(a few changes of error message) in qemu-devel.

Fixes: CVE-2023-3180
Fixes: 04b9b37edda("virtio-crypto: add data queue processing handler")
Cc: Gonglei <arei.gonglei@huawei.com>
Cc: Mauro Matteo Cascella <mcascell@redhat.com>
Cc: Yiming Tao <taoym@zju.edu.cn>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Message-Id: <20230803024314.29962-2-pizhenwei@bytedance.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
master
zhenwei pi 2023-08-03 10:43:13 +08:00 committed by Michael S. Tsirkin
parent e1e56c07d1
commit 9d38a84347
1 changed files with 5 additions and 0 deletions
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5
hw/virtio/virtio-crypto.c
View File

@ -634,6 +634,11 @@ virtio_crypto_sym_op_helper(VirtIODevice *vdev,
return NULL;
}
if (unlikely(src_len != dst_len)) {
virtio_error(vdev, "sym request src len is different from dst len");
return NULL;
}
max_len = (uint64_t)iv_len + aad_len + src_len + dst_len + hash_result_len;
if (unlikely(max_len > vcrypto->conf.max_size)) {
virtio_error(vdev, "virtio-crypto too big length");