From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f174.google.com ([209.85.192.174]:51956 "EHLO mail-pd0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755451AbaIBWdW (ORCPT ); Tue, 2 Sep 2014 18:33:22 -0400 Received: by mail-pd0-f174.google.com with SMTP id ft15so9523268pdb.5 for ; Tue, 02 Sep 2014 15:33:22 -0700 (PDT) From: behanw@converseincode.com To: agk@redhat.com, clm@fb.com, davem@davemloft.net, dm-devel@redhat.com, fabf@skynet.be, herbert@gondor.apana.org.au, jbacik@fb.com, snitzer@redhat.com Cc: akpm@linux-foundation.org, james.l.morris@oracle.com, john.johansen@canonical.com, linux-btrfs@vger.kernel.org, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, linux-security-module@vger.kernel.org, neilb@suse.de, serge@hallyn.com, torvalds@linux-foundation.org, =?UTF-8?q?Vin=C3=ADcius=20Tinti?= , =?UTF-8?q?Jan-Simon=20M=C3=B6ller?= , Behan Webster , Mark Charlebois Subject: [PATCH RFC 5/6] apparmor: LLVMLinux: Remove VLAIS Date: Tue, 2 Sep 2014 15:32:32 -0700 Message-Id: <1409697153-7006-6-git-send-email-behanw@converseincode.com> In-Reply-To: <1409697153-7006-1-git-send-email-behanw@converseincode.com> References: <1409697153-7006-1-git-send-email-behanw@converseincode.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: From: Vinícius Tinti Replaced the use of a Variable Length Array In Struct (VLAIS) with a C99 compliant equivalent. This is the original VLAIS struct. struct { struct shash_desc shash; char ctx[crypto_shash_descsize(apparmor_tfm)]; } desc; This patch instead allocates the appropriate amount of memory using an char array. The new code can be compiled with both gcc and clang. struct shash_desc contains a flexible array member member ctx declared with CRYPTO_MINALIGN_ATTR, so sizeof(struct shash_desc) aligns the beginning of the array declared after struct shash_desc with long long. No trailing padding is required because it is not a struct type that can be used in an array. The CRYPTO_MINALIGN_ATTR is required so that desc is aligned with long long as would be the case for a struct containing a member with CRYPTO_MINALIGN_ATTR. Signed-off-by: Jan-Simon Möller Signed-off-by: Behan Webster Signed-off-by: Vinícius Tinti Signed-off-by: Mark Charlebois --- security/apparmor/crypto.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/security/apparmor/crypto.c b/security/apparmor/crypto.c index 532471d..62b32e7 100644 --- a/security/apparmor/crypto.c +++ b/security/apparmor/crypto.c @@ -32,10 +32,9 @@ unsigned int aa_hash_size(void) int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start, size_t len) { - struct { - struct shash_desc shash; - char ctx[crypto_shash_descsize(apparmor_tfm)]; - } desc; + char desc[sizeof(struct shash_desc) + + crypto_shash_descsize(apparmor_tfm)] CRYPTO_MINALIGN_ATTR; + struct shash_desc *shash = (struct shash_desc *)desc; int error = -ENOMEM; u32 le32_version = cpu_to_le32(version); @@ -46,19 +45,19 @@ int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start, if (!profile->hash) goto fail; - desc.shash.tfm = apparmor_tfm; - desc.shash.flags = 0; + shash->tfm = apparmor_tfm; + shash->flags = 0; - error = crypto_shash_init(&desc.shash); + error = crypto_shash_init(shash); if (error) goto fail; - error = crypto_shash_update(&desc.shash, (u8 *) &le32_version, 4); + error = crypto_shash_update(shash, (u8 *) &le32_version, 4); if (error) goto fail; - error = crypto_shash_update(&desc.shash, (u8 *) start, len); + error = crypto_shash_update(shash, (u8 *) start, len); if (error) goto fail; - error = crypto_shash_final(&desc.shash, profile->hash); + error = crypto_shash_final(shash, profile->hash); if (error) goto fail; -- 1.9.1