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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F31EEC7618E for ; Fri, 21 Apr 2023 20:28:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233264AbjDUU2b (ORCPT ); Fri, 21 Apr 2023 16:28:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39360 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229591AbjDUU2a (ORCPT ); Fri, 21 Apr 2023 16:28:30 -0400 Received: from mail-wm1-x32b.google.com (mail-wm1-x32b.google.com [IPv6:2a00:1450:4864:20::32b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C10651FC7 for ; Fri, 21 Apr 2023 13:28:27 -0700 (PDT) Received: by mail-wm1-x32b.google.com with SMTP id 5b1f17b1804b1-3f18335a870so14553665e9.0 for ; Fri, 21 Apr 2023 13:28:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1682108906; x=1684700906; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=MDfWHM/P6nNEa1XjW5/WtrlkjEXtQfrXNsFHpzNi76Y=; b=BNz/fs651UEi35uM78DaqKkMCaaXyy9oViuvGFaszVxaFUPBz6Tyn91GUZsvQfpMag oTLJpvl6DAn+3+I4A0qrpYQf+Dzf4Nn1i/tPKLphWTdATqfoSUGAFNuil3cYxfgHNreP 0OlwyCZjQL+g+EFyd4zhzmCvDSCoVP77ZSUUW0k5M5BY95mkah2ve8OBIqm8TJTDXi0v Vcm5+DlBlykmXiHQS0ghW43dWNlYSz8qlv3BhWGpUrp0dWK4PYd4+7+u7oeqvGRoSdGp zp3t0iMwX0OLPCFZgDWqDuSLfD7H/EKIvqxphegJn7iGTUOS7C/YP6NXbwDQjKG6Raph wofg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682108906; x=1684700906; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=MDfWHM/P6nNEa1XjW5/WtrlkjEXtQfrXNsFHpzNi76Y=; b=dTKflZ3b1ofaeqJ0J7GZ3lQtceuFGKBEYt3iJr8oAaO4y6+IN0vOfDu8bg8Gbe4CAN mZZJQRHIyJQ6bfzCkRrRoaFsZ194fukKHD26IvunbRGv+xBPL1kixKTk9VGE73WueH90 6voLXxoscM5aZCX7+/SPJfVXCjgHj7vVV4b7HzNs6Z1533b9jYPDqObsrsAW7s7sCL7X Ns/7n/XqrX4ZP0YerLivOymUOYc74o/f8CfroOJyRMnbAfGwtAucdPx9sUL0w/nDa54x BqtXdZajOe6XRRxZpzQl79xEmR4h0Ieq03qBLrwbKml9BdXt3qCXu5E2h7xbDsatCrAP 7Dww== X-Gm-Message-State: AAQBX9c7wMQKMOx+yCs/uw9IgBrJmIScg/8Onmb+72tqRJVXCMGxZ6li GvjrgdsaFsEgsWvA8QO36HxO+BfM5a8= X-Google-Smtp-Source: AKy350YCNv4XKwjAYNpB6xP09yqF1vMRlXDCqd82hjCbROWJuJnKCtWFkwOHqkNfWXUwJ92PF5VuMw== X-Received: by 2002:a7b:ce87:0:b0:3f1:7277:eaa with SMTP id q7-20020a7bce87000000b003f172770eaamr2818133wmj.31.1682108906047; Fri, 21 Apr 2023 13:28:26 -0700 (PDT) Received: from asus5775.alejandro-colomar.es ([170.253.51.134]) by smtp.googlemail.com with ESMTPSA id o10-20020a1c750a000000b003f191c9c4b0sm2698226wmc.11.2023.04.21.13.28.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Apr 2023 13:28:25 -0700 (PDT) From: Alejandro Colomar X-Google-Original-From: Alejandro Colomar To: linux-man@vger.kernel.org Cc: Alejandro Colomar , =?UTF-8?q?Bastien=20Roucari=C3=A8s?= , Eric Blake , glibc , GCC , Stefan Puiu , Igor Sysoev , Rich Felker , Andrew Clayton , Richard Biener , Zack Weinberg , Florian Weimer , Joseph Myers , Jakub Jelinek , Sam James Subject: [PATCH v3] sockaddr.3type: POSIX Issue 8 will solve strict-aliasing issues with these types Date: Fri, 21 Apr 2023 22:27:18 +0200 Message-Id: <20230421202718.21831-1-alx@kernel.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org Link: Reported-by: Bastien Roucariès Reported-by: Alejandro Colomar Reviewed-by: Eric Blake Cc: glibc Cc: GCC Cc: Stefan Puiu Cc: Igor Sysoev Cc: Rich Felker Cc: Andrew Clayton Cc: Richard Biener Cc: Zack Weinberg Cc: Florian Weimer Cc: Joseph Myers Cc: Jakub Jelinek Cc: Sam James Signed-off-by: Alejandro Colomar --- Hi Eric, I took your informal review as a "Reviewed-by". Please confirm. I've also modified the small wording thingy you suggested. I'll float this patch in the list in case anyone has comments, and will push some time this weekend (depending on many variables). Cheers, Alex man3type/sockaddr.3type | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/man3type/sockaddr.3type b/man3type/sockaddr.3type index 2fdf56c59..cf8d601f5 100644 --- a/man3type/sockaddr.3type +++ b/man3type/sockaddr.3type @@ -117,6 +117,14 @@ .SH HISTORY was invented by POSIX. See also .BR accept (2). +.PP +These structures were invented before modern ISO C strict-aliasing rules. +If aliasing rules are applied strictly, +these structures would be extremely difficult to use +without invoking Undefined Behavior. +POSIX Issue 8 will fix this by requiring that implementations +make sure that these structures +can be safely used as they were designed. .SH NOTES .I socklen_t is also defined in -- 2.40.0