From patchwork Mon Feb 24 16:21:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Gustavo A. R. Silva" X-Patchwork-Id: 11400927 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AD48614BC for ; Mon, 24 Feb 2020 16:18:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7A8E72084E for ; Mon, 24 Feb 2020 16:18:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=embeddedor.com header.i=@embeddedor.com header.b="OHU2Pf21" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727479AbgBXQSO (ORCPT ); Mon, 24 Feb 2020 11:18:14 -0500 Received: from gateway21.websitewelcome.com ([192.185.45.38]:42831 "EHLO gateway21.websitewelcome.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727901AbgBXQSN (ORCPT ); Mon, 24 Feb 2020 11:18:13 -0500 Received: from cm12.websitewelcome.com (cm12.websitewelcome.com [100.42.49.8]) by gateway21.websitewelcome.com (Postfix) with ESMTP id 10ABF400C7432 for ; Mon, 24 Feb 2020 10:18:12 -0600 (CST) Received: from gator4166.hostgator.com ([108.167.133.22]) by cmsmtp with SMTP id 6GQujYaLZvBMd6GQujUnoa; Mon, 24 Feb 2020 10:18:12 -0600 X-Authority-Reason: nr=8 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=embeddedor.com; s=default; h=Content-Type:MIME-Version:Message-ID:Subject: Cc:To:From:Date:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:In-Reply-To:References:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=BK34gbLB0O61efyzvyQ9e7T52/oWtRmHRLRXHAw2v7A=; b=OHU2Pf21ilVR4MIoRzfIuodi0t pC+s5ssxjXj8L3bE0xKBCzGGycCO0QybaEiSs0oa/u4/UXDHzCU82ejg2pXvoxO8l4vsTETQ3uWss fxKalF60rtAuTQNT9lFIWavUT3LzGwO1hgYvNuc9GpNEFlLTWFZnvzR+6N2HOUwBmEXJeIhUZciQl 5epUOHZpAs7Ae3uniNt4jskl/P1ZENzz4i0NtOuJtErWQJ/rbMHxAaP/RUl9R4UWnvw00KGPHYTaH cSAagkMPtII9V80o5IQ1FUjs4xwqa4cqFwCsDaYJhSs8msYuP2hb01LXn37DfcZQoQGkodd1LvYky WuUVvmiQ==; Received: from [200.68.140.135] (port=11044 helo=embeddedor) by gator4166.hostgator.com with esmtpa (Exim 4.92) (envelope-from ) id 1j6GQr-002hbl-Rj; Mon, 24 Feb 2020 10:18:09 -0600 Date: Mon, 24 Feb 2020 10:21:00 -0600 From: "Gustavo A. R. Silva" To: Horia =?utf-8?q?Geant=C4=83?= , Aymen Sghaier , Herbert Xu , "David S. Miller" , Atul Gupta , Matthias Brugger , Breno =?iso-8859-1?q?Leit=E3o?= , Nayna Jain , Paulo Flabiano Smorigo , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, "Gustavo A. R. Silva" Subject: [PATCH] crypto: Replace zero-length array with flexible-array member Message-ID: <20200224162100.GA25697@embeddedor> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.9.4 (2018-02-28) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - gator4166.hostgator.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - embeddedor.com X-BWhitelist: no X-Source-IP: 200.68.140.135 X-Source-L: No X-Exim-ID: 1j6GQr-002hbl-Rj X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: (embeddedor) [200.68.140.135]:11044 X-Source-Auth: gustavo@embeddedor.com X-Email-Count: 32 X-Source-Cap: Z3V6aWRpbmU7Z3V6aWRpbmU7Z2F0b3I0MTY2Lmhvc3RnYXRvci5jb20= X-Local-Domain: yes Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: Gustavo A. R. Silva Reviewed-by: Horia Geantă --- drivers/crypto/caam/caamalg.c | 2 +- drivers/crypto/caam/caamalg_qi.c | 4 ++-- drivers/crypto/caam/caamalg_qi2.h | 6 +++--- drivers/crypto/caam/caamhash.c | 2 +- drivers/crypto/cavium/nitrox/nitrox_main.c | 2 +- drivers/crypto/chelsio/chcr_core.h | 2 +- drivers/crypto/mediatek/mtk-sha.c | 2 +- drivers/crypto/nx/nx.h | 2 +- drivers/crypto/omap-sham.c | 4 ++-- include/crypto/if_alg.h | 2 +- 10 files changed, 14 insertions(+), 14 deletions(-) diff --git a/drivers/crypto/caam/caamalg.c b/drivers/crypto/caam/caamalg.c index 03797f9b1050..b7bb7c30adeb 100644 --- a/drivers/crypto/caam/caamalg.c +++ b/drivers/crypto/caam/caamalg.c @@ -909,7 +909,7 @@ struct skcipher_edesc { bool bklog; dma_addr_t sec4_sg_dma; struct sec4_sg_entry *sec4_sg; - u32 hw_desc[0]; + u32 hw_desc[]; }; static void caam_unmap(struct device *dev, struct scatterlist *src, diff --git a/drivers/crypto/caam/caamalg_qi.c b/drivers/crypto/caam/caamalg_qi.c index 4a29e0ef9d63..27e36bdf6163 100644 --- a/drivers/crypto/caam/caamalg_qi.c +++ b/drivers/crypto/caam/caamalg_qi.c @@ -783,7 +783,7 @@ struct aead_edesc { unsigned int assoclen; dma_addr_t assoclen_dma; struct caam_drv_req drv_req; - struct qm_sg_entry sgt[0]; + struct qm_sg_entry sgt[]; }; /* @@ -803,7 +803,7 @@ struct skcipher_edesc { int qm_sg_bytes; dma_addr_t qm_sg_dma; struct caam_drv_req drv_req; - struct qm_sg_entry sgt[0]; + struct qm_sg_entry sgt[]; }; static struct caam_drv_ctx *get_drv_ctx(struct caam_ctx *ctx, diff --git a/drivers/crypto/caam/caamalg_qi2.h b/drivers/crypto/caam/caamalg_qi2.h index 706736776b47..f29cb7bd7dd3 100644 --- a/drivers/crypto/caam/caamalg_qi2.h +++ b/drivers/crypto/caam/caamalg_qi2.h @@ -114,7 +114,7 @@ struct aead_edesc { dma_addr_t qm_sg_dma; unsigned int assoclen; dma_addr_t assoclen_dma; - struct dpaa2_sg_entry sgt[0]; + struct dpaa2_sg_entry sgt[]; }; /* @@ -132,7 +132,7 @@ struct skcipher_edesc { dma_addr_t iv_dma; int qm_sg_bytes; dma_addr_t qm_sg_dma; - struct dpaa2_sg_entry sgt[0]; + struct dpaa2_sg_entry sgt[]; }; /* @@ -146,7 +146,7 @@ struct ahash_edesc { dma_addr_t qm_sg_dma; int src_nents; int qm_sg_bytes; - struct dpaa2_sg_entry sgt[0]; + struct dpaa2_sg_entry sgt[]; }; /** diff --git a/drivers/crypto/caam/caamhash.c b/drivers/crypto/caam/caamhash.c index 2fe852853d40..943bc0296267 100644 --- a/drivers/crypto/caam/caamhash.c +++ b/drivers/crypto/caam/caamhash.c @@ -536,7 +536,7 @@ struct ahash_edesc { int sec4_sg_bytes; bool bklog; u32 hw_desc[DESC_JOB_IO_LEN_MAX / sizeof(u32)] ____cacheline_aligned; - struct sec4_sg_entry sec4_sg[0]; + struct sec4_sg_entry sec4_sg[]; }; static inline void ahash_unmap(struct device *dev, diff --git a/drivers/crypto/cavium/nitrox/nitrox_main.c b/drivers/crypto/cavium/nitrox/nitrox_main.c index c4632d84c9a1..e91be9b8b083 100644 --- a/drivers/crypto/cavium/nitrox/nitrox_main.c +++ b/drivers/crypto/cavium/nitrox/nitrox_main.c @@ -71,7 +71,7 @@ struct ucode { char version[VERSION_LEN - 1]; __be32 code_size; u8 raz[12]; - u64 code[0]; + u64 code[]; }; /** diff --git a/drivers/crypto/chelsio/chcr_core.h b/drivers/crypto/chelsio/chcr_core.h index b41ef1abfe74..e480096754b5 100644 --- a/drivers/crypto/chelsio/chcr_core.h +++ b/drivers/crypto/chelsio/chcr_core.h @@ -68,7 +68,7 @@ struct _key_ctx { __be32 ctx_hdr; u8 salt[MAX_SALT]; __be64 iv_to_auth; - unsigned char key[0]; + unsigned char key[]; }; #define KEYCTX_TX_WR_IV_S 55 diff --git a/drivers/crypto/mediatek/mtk-sha.c b/drivers/crypto/mediatek/mtk-sha.c index 9e9f48bb7f85..bd6309e57ab8 100644 --- a/drivers/crypto/mediatek/mtk-sha.c +++ b/drivers/crypto/mediatek/mtk-sha.c @@ -107,7 +107,7 @@ struct mtk_sha_ctx { u8 id; u8 buf[SHA_BUF_SIZE] __aligned(sizeof(u32)); - struct mtk_sha_hmac_ctx base[0]; + struct mtk_sha_hmac_ctx base[]; }; struct mtk_sha_drv { diff --git a/drivers/crypto/nx/nx.h b/drivers/crypto/nx/nx.h index 91c54289124a..c6233173c612 100644 --- a/drivers/crypto/nx/nx.h +++ b/drivers/crypto/nx/nx.h @@ -37,7 +37,7 @@ struct max_sync_cop { u32 fc; u32 mode; u32 triplets; - struct msc_triplet trip[0]; + struct msc_triplet trip[]; } __packed; struct alg_props { diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c index 4f915a4ef5b0..e4072cd38585 100644 --- a/drivers/crypto/omap-sham.c +++ b/drivers/crypto/omap-sham.c @@ -159,7 +159,7 @@ struct omap_sham_reqctx { int sg_len; unsigned int total; /* total request */ - u8 buffer[0] OMAP_ALIGNED; + u8 buffer[] OMAP_ALIGNED; }; struct omap_sham_hmac_ctx { @@ -176,7 +176,7 @@ struct omap_sham_ctx { /* fallback stuff */ struct crypto_shash *fallback; - struct omap_sham_hmac_ctx base[0]; + struct omap_sham_hmac_ctx base[]; }; #define OMAP_SHAM_QUEUE_LENGTH 10 diff --git a/include/crypto/if_alg.h b/include/crypto/if_alg.h index 24cfa96f98ea..56527c85d122 100644 --- a/include/crypto/if_alg.h +++ b/include/crypto/if_alg.h @@ -66,7 +66,7 @@ struct af_alg_sgl { struct af_alg_tsgl { struct list_head list; unsigned int cur; /* Last processed SG entry */ - struct scatterlist sg[0]; /* Array of SGs forming the SGL */ + struct scatterlist sg[]; /* Array of SGs forming the SGL */ }; #define MAX_SGL_ENTS ((4096 - sizeof(struct af_alg_tsgl)) / \