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 X-Spam-Level: X-Spam-Status: No, score=-5.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BD60DC43468 for ; Sun, 20 Sep 2020 19:28:37 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 4D9C92084C for ; Sun, 20 Sep 2020 19:28:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="JjkWdzs8" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4D9C92084C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id B00B890000F; Sun, 20 Sep 2020 15:28:36 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id AD9FA900009; Sun, 20 Sep 2020 15:28:36 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 99EC590000F; Sun, 20 Sep 2020 15:28:36 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0006.hostedemail.com [216.40.44.6]) by kanga.kvack.org (Postfix) with ESMTP id 7FC6C900009 for ; Sun, 20 Sep 2020 15:28:36 -0400 (EDT) Received: from smtpin26.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 44285180AD801 for ; Sun, 20 Sep 2020 19:28:36 +0000 (UTC) X-FDA: 77284426632.26.rat30_3a0e6122713f Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin26.hostedemail.com (Postfix) with ESMTP id 134081804B660 for ; Sun, 20 Sep 2020 19:28:36 +0000 (UTC) X-HE-Tag: rat30_3a0e6122713f X-Filterd-Recvd-Size: 3739 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf44.hostedemail.com (Postfix) with ESMTP for ; Sun, 20 Sep 2020 19:28:35 +0000 (UTC) Received: from mail-ed1-f52.google.com (mail-ed1-f52.google.com [209.85.208.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 35481235FC for ; Sun, 20 Sep 2020 19:28:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600630114; bh=MvoJlqBNzeGMhQj08qmauzE2jefx91WtS5O4xpiUc2w=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=JjkWdzs8l4VG7axJD8j1N7zsDNyHx01VvIoenQP0XrkbTc8PSIPFDC+ocOwK5vc2K RrxibNtkQ6Bu2l0c6FA8qAmsm6Zk+9gHRRr0jrtaswknN6/RVSUvSl9tUHIGyxATeV mD5rOKF8ZZ6lwaLYgtTds2laysQr8iIjXXnAGF54= Received: by mail-ed1-f52.google.com with SMTP id n22so10842196edt.4 for ; Sun, 20 Sep 2020 12:28:34 -0700 (PDT) X-Gm-Message-State: AOAM532WUmqn9yRsxu0Wt0EjFetes4SoJ7blT3WT//Tn+K1KlssrmqdH HS23yQOZu7cwomY3pLOsvgvZWGJ9gh8ileeUbrTe5A== X-Google-Smtp-Source: ABdhPJyGRJyXPIIAcXrNp8ibkDlg/u7fNSqAcKhSzeIjm5dJtxkt9PxOngbofryv0JcZUoQWH7pgaf1q3lhvPecaOZc= X-Received: by 2002:a5d:6a47:: with SMTP id t7mr48111800wrw.75.1600630112287; Sun, 20 Sep 2020 12:28:32 -0700 (PDT) MIME-Version: 1.0 References: <20200918124533.3487701-1-hch@lst.de> <20200918124533.3487701-2-hch@lst.de> <20200920151510.GS32101@casper.infradead.org> <20200920180742.GN3421308@ZenIV.linux.org.uk> <20200920190159.GT32101@casper.infradead.org> <20200920191031.GQ3421308@ZenIV.linux.org.uk> <20200920192259.GU32101@casper.infradead.org> In-Reply-To: <20200920192259.GU32101@casper.infradead.org> From: Andy Lutomirski Date: Sun, 20 Sep 2020 12:28:20 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 1/9] kernel: add a PF_FORCE_COMPAT flag To: Matthew Wilcox Cc: Al Viro , Christoph Hellwig , Andrew Morton , Jens Axboe , Arnd Bergmann , David Howells , linux-arm-kernel , X86 ML , LKML , "open list:MIPS" , Parisc List , linuxppc-dev , linux-s390 , sparclinux , linux-block , Linux SCSI List , Linux FS Devel , linux-aio , io-uring@vger.kernel.org, linux-arch , Linux-MM , Network Development , keyrings@vger.kernel.org, LSM List Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sun, Sep 20, 2020 at 12:23 PM Matthew Wilcox wrote: > > On Sun, Sep 20, 2020 at 08:10:31PM +0100, Al Viro wrote: > > IMO it's much saner to mark those and refuse to touch them from io_uring... > > Simpler solution is to remove io_uring from the 32-bit syscall list. > If you're a 32-bit process, you don't get to use io_uring. Would > any real users actually care about that? We could go one step farther and declare that we're done adding *any* new compat syscalls :) -- Andy Lutomirski AMA Capital Management, LLC