From patchwork Fri Jun 14 09:42:50 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ard Biesheuvel X-Patchwork-Id: 10994815 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AD6901515 for ; Fri, 14 Jun 2019 09:42:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A062A1FF29 for ; Fri, 14 Jun 2019 09:42:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9425D281E1; Fri, 14 Jun 2019 09:42:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 61FB0281E1 for ; Fri, 14 Jun 2019 09:42:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727108AbfFNJm5 (ORCPT ); Fri, 14 Jun 2019 05:42:57 -0400 Received: from mail-wr1-f65.google.com ([209.85.221.65]:39452 "EHLO mail-wr1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727130AbfFNJm5 (ORCPT ); Fri, 14 Jun 2019 05:42:57 -0400 Received: by mail-wr1-f65.google.com with SMTP id x4so1797917wrt.6 for ; Fri, 14 Jun 2019 02:42:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=1tGskau943T386kyJZ4GTkvXE83xs6wkbIyb/EV2Rpk=; b=zBXs+2W3UpOSNa9yIXR5X5C5PcdW90YRk8Xk9269IPzzdpM8TE+9iwWo5jDl1c7kci AZaep9/v4N4zUEnNrGWNN37lVGPWtPR7EOK1ZfxjgUh+zPidqS8LivsyBx3wVdxFEemt VjvWkfqx9Myp9n1FlZXxOxIfqMAgf6hvM8dVACwchgf+CkuBRLIiI07KVj922iYSNCo6 QB0vpfWtjDnEETJk2AcQ2S8hXnhjVTVrnZL5N84OJFZLr69PQB6aGLDmmLjtKRPw+ErB y/P6YHCIqlWHJUhlI4GNs5/3jbDocHbZAoh+MrXEL6MO+jlapfEpk3Vnl3RaqnxwNpvL OezQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=1tGskau943T386kyJZ4GTkvXE83xs6wkbIyb/EV2Rpk=; b=MKVO9UCxJC8RRDy93JtupXAlzF1Kj69kpbA6VbJp2yWhHpG/PRwbgNcvhq9n/D7p7Y CoLv28OlvQMXAZjCEd3VeWHFRjiwFPNS2n8MvU9rLrlutgeLCnrluDwbtzXp3WzqIBDv n7/NdCMIzlWeRzH+GbK4pdcYTKgjK5IbQ+Ihh6GGcPMrh7KWJiH5XRyb9BEjMS4SIysI OXh1ndxUAV3M40r+tANS8iazDA7UW0vJG/HZm1d5Ny/h5KAh0JO+Xkczt+WuZFadUz0a AkArNANkHLEygRNBFs/ManJeUBt2IPirEDWFvKXkEjOs9Tfium8ZpQmoQCu3abU2dZQg 9JIA== X-Gm-Message-State: APjAAAUR48FP7urdjy2+Y+F/qcZ1CZRDukJ2T5F8uYXAOb4kl+L8fO+m zJXRYQFIMShpTywexg5wZA+CYLsS9Fx3jg== X-Google-Smtp-Source: APXvYqx0Db3o3ZFAEBSbPaDuezp3pPOGT2TknFdYmxY96lSJbhl/a9mWkPJqEcokRvgXBp2rPlJIuQ== X-Received: by 2002:adf:ef8d:: with SMTP id d13mr47605958wro.60.1560505373986; Fri, 14 Jun 2019 02:42:53 -0700 (PDT) Received: from sudo.home ([2a01:cb1d:112:6f00:8d0e:a5b1:c005:e3b5]) by smtp.gmail.com with ESMTPSA id d10sm3502267wrp.74.2019.06.14.02.42.53 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 14 Jun 2019 02:42:53 -0700 (PDT) From: Ard Biesheuvel To: linux-usb@vger.kernel.org Cc: gregkh@linuxfoundation.org, linux-crypto@vger.kernel.org, ebiggers@kernel.org, herbert@gondor.apana.org.au, Ard Biesheuvel Subject: [PATCH] wireless: airo: switch to skcipher interface Date: Fri, 14 Jun 2019 11:42:50 +0200 Message-Id: <20190614094250.22997-1-ard.biesheuvel@linaro.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The AIRO driver applies a ctr(aes) on a buffer of considerable size (2400 bytes), and instead of invoking the crypto API to handle this in its entirety, it open codes the counter manipulation and invokes the AES block cipher directly. Let's fix this, by switching to the sync skcipher API instead. Signed-off-by: Ard Biesheuvel --- NOTE: build tested only, since I don't have the hardware drivers/net/wireless/cisco/airo.c | 57 ++++++++++---------- 1 file changed, 27 insertions(+), 30 deletions(-) diff --git a/drivers/net/wireless/cisco/airo.c b/drivers/net/wireless/cisco/airo.c index 3f5a14112c6b..2d29ad10505b 100644 --- a/drivers/net/wireless/cisco/airo.c +++ b/drivers/net/wireless/cisco/airo.c @@ -49,6 +49,9 @@ #include #include +#include +#include + #include #include @@ -951,7 +954,7 @@ typedef struct { } mic_statistics; typedef struct { - u32 coeff[((EMMH32_MSGLEN_MAX)+3)>>2]; + __be32 coeff[((EMMH32_MSGLEN_MAX)+3)>>2]; u64 accum; // accumulated mic, reduced to u32 in final() int position; // current position (byte offset) in message union { @@ -1216,7 +1219,7 @@ struct airo_info { struct iw_spy_data spy_data; struct iw_public_data wireless_data; /* MIC stuff */ - struct crypto_cipher *tfm; + struct crypto_sync_skcipher *tfm; mic_module mod[2]; mic_statistics micstats; HostRxDesc rxfids[MPI_MAX_FIDS]; // rx/tx/config MPI350 descriptors @@ -1291,14 +1294,14 @@ static int flashrestart(struct airo_info *ai,struct net_device *dev); static int RxSeqValid (struct airo_info *ai,miccntx *context,int mcast,u32 micSeq); static void MoveWindow(miccntx *context, u32 micSeq); static void emmh32_setseed(emmh32_context *context, u8 *pkey, int keylen, - struct crypto_cipher *tfm); + struct crypto_sync_skcipher *tfm); static void emmh32_init(emmh32_context *context); static void emmh32_update(emmh32_context *context, u8 *pOctets, int len); static void emmh32_final(emmh32_context *context, u8 digest[4]); static int flashpchar(struct airo_info *ai,int byte,int dwelltime); static void age_mic_context(miccntx *cur, miccntx *old, u8 *key, int key_len, - struct crypto_cipher *tfm) + struct crypto_sync_skcipher *tfm) { /* If the current MIC context is valid and its key is the same as * the MIC register, there's nothing to do. @@ -1359,7 +1362,7 @@ static int micsetup(struct airo_info *ai) { int i; if (ai->tfm == NULL) - ai->tfm = crypto_alloc_cipher("aes", 0, 0); + ai->tfm = crypto_alloc_sync_skcipher("ctr(aes)", 0, 0); if (IS_ERR(ai->tfm)) { airo_print_err(ai->dev->name, "failed to load transform for AES"); @@ -1624,37 +1627,31 @@ static void MoveWindow(miccntx *context, u32 micSeq) /* mic accumulate */ #define MIC_ACCUM(val) \ - context->accum += (u64)(val) * context->coeff[coeff_position++]; - -static unsigned char aes_counter[16]; + context->accum += (u64)(val) * be32_to_cpu(context->coeff[coeff_position++]); /* expand the key to fill the MMH coefficient array */ static void emmh32_setseed(emmh32_context *context, u8 *pkey, int keylen, - struct crypto_cipher *tfm) + struct crypto_sync_skcipher *tfm) { /* take the keying material, expand if necessary, truncate at 16-bytes */ /* run through AES counter mode to generate context->coeff[] */ - int i,j; - u32 counter; - u8 *cipher, plain[16]; - - crypto_cipher_setkey(tfm, pkey, 16); - counter = 0; - for (i = 0; i < ARRAY_SIZE(context->coeff); ) { - aes_counter[15] = (u8)(counter >> 0); - aes_counter[14] = (u8)(counter >> 8); - aes_counter[13] = (u8)(counter >> 16); - aes_counter[12] = (u8)(counter >> 24); - counter++; - memcpy (plain, aes_counter, 16); - crypto_cipher_encrypt_one(tfm, plain, plain); - cipher = plain; - for (j = 0; (j < 16) && (i < ARRAY_SIZE(context->coeff)); ) { - context->coeff[i++] = ntohl(*(__be32 *)&cipher[j]); - j += 4; - } - } + SYNC_SKCIPHER_REQUEST_ON_STACK(req, tfm); + struct scatterlist dst, src; + u8 iv[AES_BLOCK_SIZE] = {}; + int ret; + + crypto_sync_skcipher_setkey(tfm, pkey, 16); + + sg_init_one(&dst, context->coeff, sizeof(context->coeff)); + sg_init_one(&src, page_address(ZERO_PAGE(0)), sizeof(context->coeff)); + + skcipher_request_set_sync_tfm(req, tfm); + skcipher_request_set_callback(req, 0, NULL, NULL); + skcipher_request_set_crypt(req, &src, &dst, sizeof(context->coeff), iv); + + ret = crypto_skcipher_encrypt(req); + WARN_ON_ONCE(ret); } /* prepare for calculation of a new mic */ @@ -2415,7 +2412,7 @@ void stop_airo_card( struct net_device *dev, int freeres ) ai->shared, ai->shared_dma); } } - crypto_free_cipher(ai->tfm); + crypto_free_sync_skcipher(ai->tfm); del_airo_dev(ai); free_netdev( dev ); }