From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 85A7BE6748D for ; Sun, 21 Dec 2025 02:44:31 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vX9QN-0002a6-1b; Sat, 20 Dec 2025 21:43:59 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vX9QK-0002Zg-T8 for qemu-devel@nongnu.org; Sat, 20 Dec 2025 21:43:56 -0500 Received: from out-180.mta0.migadu.com ([2001:41d0:1004:224b::b4]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vX9QJ-000470-Cc for qemu-devel@nongnu.org; Sat, 20 Dec 2025 21:43:56 -0500 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1766285028; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=dmP6Wvk0KETdBC34SFuuuEpsYY5VRmQDyspL0DmBLGA=; b=bdnP6y7/N29p2vHUeAbE3WPHfhy9BAWEs1jzkj8RYxRVb/uMoyvnEdorJFCoPhurP4xlDc E7Dz+4lByNjdCJsdZA9sgfKeU9OPRXaAv/sqYAN36MCOIPpUhVrZQfS8CDA+diL7TJH3y+ Tz9zJtp75uolczxPG2BofeKWSJzQuis= From: zhenwei pi To: qemu-devel@nongnu.org Cc: mst@redhat.com, arei.gonglei@huawei.com, mcascell@redhat.com, nakamurajames123@gmail.com, zhenwei pi , zhenwei pi Subject: [PATCH v2 2/2] cryptodev-builtin: Limit the maximum size Date: Sun, 21 Dec 2025 10:43:21 +0800 Message-ID: <20251221024321.143196-3-zhenwei.pi@linux.dev> In-Reply-To: <20251221024321.143196-1-zhenwei.pi@linux.dev> References: <20251221024321.143196-1-zhenwei.pi@linux.dev> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT Received-SPF: pass client-ip=2001:41d0:1004:224b::b4; envelope-from=zhenwei.pi@linux.dev; helo=out-180.mta0.migadu.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: zhenwei pi This backend driver is used for demonstration purposes only, unlimited size leads QEMU OOM. Fixes: CVE-2025-14876 Fixes: 1653a5f3fc7 ("cryptodev: introduce a new cryptodev backend") Reported-by: 이재영 Signed-off-by: zhenwei pi --- backends/cryptodev-builtin.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/backends/cryptodev-builtin.c b/backends/cryptodev-builtin.c index 0414c01e06..55a3fbd27b 100644 --- a/backends/cryptodev-builtin.c +++ b/backends/cryptodev-builtin.c @@ -53,6 +53,8 @@ typedef struct CryptoDevBackendBuiltinSession { #define CRYPTODEV_BUITLIN_MAX_AUTH_KEY_LEN 512 #define CRYPTODEV_BUITLIN_MAX_CIPHER_KEY_LEN 64 +/* demonstration purposes only, use a limited size to avoid QEMU OOM */ +#define CRYPTODEV_BUITLIN_MAX_REQUEST_SIZE (1024 * 1024) struct CryptoDevBackendBuiltin { CryptoDevBackend parent_obj; @@ -98,12 +100,7 @@ static void cryptodev_builtin_init( 1u << QCRYPTODEV_BACKEND_SERVICE_TYPE_MAC; backend->conf.cipher_algo_l = 1u << VIRTIO_CRYPTO_CIPHER_AES_CBC; backend->conf.hash_algo = 1u << VIRTIO_CRYPTO_HASH_SHA1; - /* - * Set the Maximum length of crypto request. - * Why this value? Just avoid to overflow when - * memory allocation for each crypto request. - */ - backend->conf.max_size = LONG_MAX - sizeof(CryptoDevBackendOpInfo); + backend->conf.max_size = CRYPTODEV_BUITLIN_MAX_REQUEST_SIZE; backend->conf.max_cipher_key_len = CRYPTODEV_BUITLIN_MAX_CIPHER_KEY_LEN; backend->conf.max_auth_key_len = CRYPTODEV_BUITLIN_MAX_AUTH_KEY_LEN; cryptodev_builtin_init_akcipher(backend); -- 2.43.0