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[23.128.96.18]) by mx.google.com with ESMTP id g21si12659303ejx.118.2021.05.10.01.19.05; Mon, 10 May 2021 01:19:29 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=canonical.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230093AbhEJISg (ORCPT + 99 others); Mon, 10 May 2021 04:18:36 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:37274 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230331AbhEJISe (ORCPT ); Mon, 10 May 2021 04:18:34 -0400 Received: from [50.53.41.238] (helo=[192.168.192.153]) by youngberry.canonical.com with esmtpsa (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.93) (envelope-from ) id 1lg16V-0004Ab-0S; Mon, 10 May 2021 08:17:27 +0000 Subject: Re: [RFC 09/12] apparmor: use get_unaligned() only for multi-byte words To: Arnd Bergmann , linux-arch@vger.kernel.org Cc: Linus Torvalds , Vineet Gupta , Arnd Bergmann , James Morris , "Serge E. Hallyn" , linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org References: <20210507220813.365382-1-arnd@kernel.org> <20210507220813.365382-10-arnd@kernel.org> From: John Johansen Autocrypt: addr=john.johansen@canonical.com; prefer-encrypt=mutual; keydata= LS0tLS1CRUdJTiBQR1AgUFVCTElDIEtFWSBCTE9DSy0tLS0tCgptUUlOQkU1bXJQb0JFQURB azE5UHNnVmdCS2tJbW1SMmlzUFE2bzdLSmhUVEtqSmR3VmJrV1NuTm4rbzZVcDVrCm5LUDFm NDlFQlFsY2VXZzF5cC9Od2JSOGFkK2VTRU8vdW1hL0srUHFXdkJwdEtDOVNXRDk3Rkc0dUI0 L2Nhb20KTEVVOTdzTFFNdG52R1dkeHJ4VlJHTTRhbnpXWU1neno1VFptSWlWVFo0M091NVZw YVMxVnoxWlN4UDNoL3hLTgpaci9UY1c1V1FhaTh1M1BXVm5ia2poU1pQSHYxQmdoTjY5cXhF UG9tckpCbTFnbXR4M1ppVm1GWGx1d1RtVGdKCk9rcEZvbDduYkowaWxuWUhyQTdTWDNDdFIx dXBlVXBNYS9XSWFuVk85NldkVGpISElhNDNmYmhtUXViZTR0eFMKM0ZjUUxPSlZxUXN4NmxF OUI3cUFwcG05aFExMHFQV3dkZlB5LyswVzZBV3ROdTVBU2lHVkNJbld6bDJIQnFZZAovWmxs OTN6VXErTklvQ244c0RBTTlpSCt3dGFHRGNKeXdJR0luK2VkS050SzcyQU1nQ2hUZy9qMVpv 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1.0 In-Reply-To: <20210507220813.365382-10-arnd@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/7/21 3:07 PM, Arnd Bergmann wrote: > From: Arnd Bergmann > > Using get_unaligned() on a u8 pointer is pointless, and will > result in a compiler warning after a planned cleanup: > > In file included from arch/x86/include/generated/asm/unaligned.h:1, > from security/apparmor/policy_unpack.c:16: > security/apparmor/policy_unpack.c: In function 'unpack_u8': > include/asm-generic/unaligned.h:13:15: error: 'packed' attribute ignored for field of type 'u8' {aka 'unsigned char'} [-Werror=attributes] > 13 | const struct { type x __packed; } *__pptr = (typeof(__pptr))(ptr); \ > | ^ > > Simply dereference this pointer directly. > > Signed-off-by: Arnd Bergmann Acked-by: John Johansen > --- > security/apparmor/policy_unpack.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c > index b8efbda545cb..0acca6f2a93f 100644 > --- a/security/apparmor/policy_unpack.c > +++ b/security/apparmor/policy_unpack.c > @@ -304,7 +304,7 @@ static bool unpack_u8(struct aa_ext *e, u8 *data, const char *name) > if (!inbounds(e, sizeof(u8))) > goto fail; > if (data) > - *data = get_unaligned((u8 *)e->pos); > + *data = *((u8 *)e->pos); > e->pos += sizeof(u8); > return true; > } >