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 X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F0873C17440 for ; Wed, 13 Nov 2019 02:12:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CAE9D222D4 for ; Wed, 13 Nov 2019 02:12:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573611139; bh=Px8LDoTDnzsd2k6eVGs/JHCeZgoJhRDfbj1HwYsvyKw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=w1fGePwjFtZk7TgQdETsIBfj9aVx8mK9IJc2DkIjvFVhDpksktlj8yer67q6NO/Cz qIxvJGNx2roDKz/6MdS/MjiU0MTN9lKeZYFttqnUkkXhab5x/tYylZWwytmEgYmYDv TWqUoC0o0DYP8bEIo+IYsRl4IlcqyZk3Z0pt86Ek= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727568AbfKMCMO (ORCPT ); Tue, 12 Nov 2019 21:12:14 -0500 Received: from mail.kernel.org ([198.145.29.99]:52226 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730014AbfKMB61 (ORCPT ); Tue, 12 Nov 2019 20:58:27 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8A3092245A; Wed, 13 Nov 2019 01:58:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573610306; bh=Px8LDoTDnzsd2k6eVGs/JHCeZgoJhRDfbj1HwYsvyKw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RuGhxfZtCRzJ2vkUO4GRQJqnWCKW33lzqBjPXxL+T2w8YEhcpfkq9T53FXeCM8+sx SfB7hXo9bJt1HmYuVRRoF3Zo+Z0/PJZoQ9sP+ufz+t2A5EjWlrO7JFDXtdyn3NTzgH MqdhWhUwr7+4wK7SSzfO8RDTQxz2QEE6gygZXHkE= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Radu Solea , Leonard Crestez , Herbert Xu , Sasha Levin , linux-crypto@vger.kernel.org Subject: [PATCH AUTOSEL 4.14 075/115] crypto: mxs-dcp - Fix SHA null hashes and output length Date: Tue, 12 Nov 2019 20:55:42 -0500 Message-Id: <20191113015622.11592-75-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191113015622.11592-1-sashal@kernel.org> References: <20191113015622.11592-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org From: Radu Solea [ Upstream commit c709eebaf5c5faa8a0f140355f9cfe67e8f7afb1 ] DCP writes at least 32 bytes in the output buffer instead of hash length as documented. Add intermediate buffer to prevent write out of bounds. When requested to produce null hashes DCP fails to produce valid output. Add software workaround to bypass hardware and return valid output. Signed-off-by: Radu Solea Signed-off-by: Leonard Crestez Signed-off-by: Herbert Xu Signed-off-by: Sasha Levin --- drivers/crypto/mxs-dcp.c | 47 +++++++++++++++++++++++++++++++--------- 1 file changed, 37 insertions(+), 10 deletions(-) diff --git a/drivers/crypto/mxs-dcp.c b/drivers/crypto/mxs-dcp.c index a98a25733a222..4615dbee22d0a 100644 --- a/drivers/crypto/mxs-dcp.c +++ b/drivers/crypto/mxs-dcp.c @@ -28,9 +28,24 @@ #define DCP_MAX_CHANS 4 #define DCP_BUF_SZ PAGE_SIZE +#define DCP_SHA_PAY_SZ 64 #define DCP_ALIGNMENT 64 +/* + * Null hashes to align with hw behavior on imx6sl and ull + * these are flipped for consistency with hw output + */ +const uint8_t sha1_null_hash[] = + "\x09\x07\xd8\xaf\x90\x18\x60\x95\xef\xbf" + "\x55\x32\x0d\x4b\x6b\x5e\xee\xa3\x39\xda"; + +const uint8_t sha256_null_hash[] = + "\x55\xb8\x52\x78\x1b\x99\x95\xa4" + "\x4c\x93\x9b\x64\xe4\x41\xae\x27" + "\x24\xb9\x6f\x99\xc8\xf4\xfb\x9a" + "\x14\x1c\xfc\x98\x42\xc4\xb0\xe3"; + /* DCP DMA descriptor. */ struct dcp_dma_desc { uint32_t next_cmd_addr; @@ -48,6 +63,7 @@ struct dcp_coherent_block { uint8_t aes_in_buf[DCP_BUF_SZ]; uint8_t aes_out_buf[DCP_BUF_SZ]; uint8_t sha_in_buf[DCP_BUF_SZ]; + uint8_t sha_out_buf[DCP_SHA_PAY_SZ]; uint8_t aes_key[2 * AES_KEYSIZE_128]; @@ -513,8 +529,6 @@ static int mxs_dcp_run_sha(struct ahash_request *req) struct crypto_ahash *tfm = crypto_ahash_reqtfm(req); struct dcp_async_ctx *actx = crypto_ahash_ctx(tfm); struct dcp_sha_req_ctx *rctx = ahash_request_ctx(req); - struct hash_alg_common *halg = crypto_hash_alg_common(tfm); - struct dcp_dma_desc *desc = &sdcp->coh->desc[actx->chan]; dma_addr_t digest_phys = 0; @@ -536,10 +550,23 @@ static int mxs_dcp_run_sha(struct ahash_request *req) desc->payload = 0; desc->status = 0; + /* + * Align driver with hw behavior when generating null hashes + */ + if (rctx->init && rctx->fini && desc->size == 0) { + struct hash_alg_common *halg = crypto_hash_alg_common(tfm); + const uint8_t *sha_buf = + (actx->alg == MXS_DCP_CONTROL1_HASH_SELECT_SHA1) ? + sha1_null_hash : sha256_null_hash; + memcpy(sdcp->coh->sha_out_buf, sha_buf, halg->digestsize); + ret = 0; + goto done_run; + } + /* Set HASH_TERM bit for last transfer block. */ if (rctx->fini) { - digest_phys = dma_map_single(sdcp->dev, req->result, - halg->digestsize, DMA_FROM_DEVICE); + digest_phys = dma_map_single(sdcp->dev, sdcp->coh->sha_out_buf, + DCP_SHA_PAY_SZ, DMA_FROM_DEVICE); desc->control0 |= MXS_DCP_CONTROL0_HASH_TERM; desc->payload = digest_phys; } @@ -547,9 +574,10 @@ static int mxs_dcp_run_sha(struct ahash_request *req) ret = mxs_dcp_start_dma(actx); if (rctx->fini) - dma_unmap_single(sdcp->dev, digest_phys, halg->digestsize, + dma_unmap_single(sdcp->dev, digest_phys, DCP_SHA_PAY_SZ, DMA_FROM_DEVICE); +done_run: dma_unmap_single(sdcp->dev, buf_phys, DCP_BUF_SZ, DMA_TO_DEVICE); return ret; @@ -567,6 +595,7 @@ static int dcp_sha_req_to_buf(struct crypto_async_request *arq) const int nents = sg_nents(req->src); uint8_t *in_buf = sdcp->coh->sha_in_buf; + uint8_t *out_buf = sdcp->coh->sha_out_buf; uint8_t *src_buf; @@ -621,11 +650,9 @@ static int dcp_sha_req_to_buf(struct crypto_async_request *arq) actx->fill = 0; - /* For some reason, the result is flipped. */ - for (i = 0; i < halg->digestsize / 2; i++) { - swap(req->result[i], - req->result[halg->digestsize - i - 1]); - } + /* For some reason the result is flipped */ + for (i = 0; i < halg->digestsize; i++) + req->result[i] = out_buf[halg->digestsize - i - 1]; } return 0; -- 2.20.1