Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760439Ab2J3Shz (ORCPT ); Tue, 30 Oct 2012 14:37:55 -0400 Received: from mail-ie0-f174.google.com ([209.85.223.174]:45244 "EHLO mail-ie0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757488Ab2J3ShP (ORCPT ); Tue, 30 Oct 2012 14:37:15 -0400 From: Behan Webster To: herbert@gondor.hengli.com.au, davem@davemloft.net Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, =?UTF-8?q?Jan-Simon=20M=C3=B6ller?= , pageexec@freemail.hu, Behan Webster Subject: [PATCH 1/2] Remove VLAIS usage from crypto/hmac.c Date: Tue, 30 Oct 2012 14:37:28 -0400 Message-Id: <1351622249-18084-2-git-send-email-behanw@converseincode.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1351622249-18084-1-git-send-email-behanw@converseincode.com> References: <1351622249-18084-1-git-send-email-behanw@converseincode.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2615 Lines: 77 From: Jan-Simon Möller The use of variable length arrays in structs (VLAIS) in the Linux Kernel code precludes the use of compilers which don't implement VLAIS (for instance the Clang compiler). This patch instead allocates the appropriate amount of memory using an char array. Patch from series at http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20120507/142707.html by PaX Team. Signed-off-by: Jan-Simon Möller Cc: pageexec@freemail.hu Signed-off-by: Behan Webster --- crypto/hmac.c | 27 +++++++++++++-------------- 1 file changed, 13 insertions(+), 14 deletions(-) diff --git a/crypto/hmac.c b/crypto/hmac.c index 8d9544c..1061255 100644 --- a/crypto/hmac.c +++ b/crypto/hmac.c @@ -52,20 +52,19 @@ static int hmac_setkey(struct crypto_shash *parent, struct hmac_ctx *ctx = align_ptr(opad + ss, crypto_tfm_ctx_alignment()); struct crypto_shash *hash = ctx->hash; - struct { - struct shash_desc shash; - char ctx[crypto_shash_descsize(hash)]; - } desc; + char desc[sizeof(struct shash_desc) + crypto_shash_descsize(hash) + + CRYPTO_MINALIGN] CRYPTO_MINALIGN_ATTR; + struct shash_desc *shash = (struct shash_desc *)desc; unsigned int i; - desc.shash.tfm = hash; - desc.shash.flags = crypto_shash_get_flags(parent) & - CRYPTO_TFM_REQ_MAY_SLEEP; + shash->tfm = hash; + shash->flags = crypto_shash_get_flags(parent) + & CRYPTO_TFM_REQ_MAY_SLEEP; if (keylen > bs) { int err; - err = crypto_shash_digest(&desc.shash, inkey, keylen, ipad); + err = crypto_shash_digest(shash, inkey, keylen, ipad); if (err) return err; @@ -81,12 +80,12 @@ static int hmac_setkey(struct crypto_shash *parent, opad[i] ^= 0x5c; } - return crypto_shash_init(&desc.shash) ?: - crypto_shash_update(&desc.shash, ipad, bs) ?: - crypto_shash_export(&desc.shash, ipad) ?: - crypto_shash_init(&desc.shash) ?: - crypto_shash_update(&desc.shash, opad, bs) ?: - crypto_shash_export(&desc.shash, opad); + return crypto_shash_init(shash) ?: + crypto_shash_update(shash, ipad, bs) ?: + crypto_shash_export(shash, ipad) ?: + crypto_shash_init(shash) ?: + crypto_shash_update(shash, opad, bs) ?: + crypto_shash_export(shash, opad); } static int hmac_export(struct shash_desc *pdesc, void *out) -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/