From patchwork Wed Jul 25 13:45:10 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Will Deacon X-Patchwork-Id: 142858 Delivered-To: patch@linaro.org Received: by 2002:a2e:9754:0:0:0:0:0 with SMTP id f20-v6csp839006ljj; Wed, 25 Jul 2018 06:45:26 -0700 (PDT) X-Google-Smtp-Source: AAOMgpe6lyAhz1VSjufOUVtjVxtETt1hmfirFJys7V/5MKna+jY61e15hiNyX4aKzmBSJkANcgeZ X-Received: by 2002:a17:902:26c:: with SMTP id 99-v6mr20700656plc.341.1532526326244; Wed, 25 Jul 2018 06:45:26 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1532526326; cv=none; d=google.com; s=arc-20160816; b=nQiyytWWVcDiJgaTVHqQqwFFNONYOE60DGzDtfNJb7SsQWSVuOnnVm1GiglChR0wZ/ neUX19Q3nbaQJPOTBgmQuN7twVEBIEHhPW3n3yKeu5LMBCfETmhNFdEQu0XA6TP21Bd6 9xmgY6XWAFiUfOcNDZoSK+txCGiOLJqMZyxay/FqjAkSO7Mbm4iaejm/LbBV4oYa74Ow I3fKYzzbHrobuEswi5N9omZ7yuSahA3UDNGdRNS/FhalzkQ04gT2TXLPgJMa3oHO6uO9 cAcKGjcXwf0eBerngyWMxd3Bo6F+4ETORxh4H8mPMSGTLK+UTyICUSdLJuRiV5dyExKo f4Pw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:message-id:date:subject:cc:to:from :arc-authentication-results; bh=N82H8a7AmmKWTlpSCKuDul1y/UP9MRhJKsWg6/wpNDo=; b=BL1EcKFjRsAEyLsua0VN3L1zUHY3+iyiljHTTs0iJIcKZRLhhSoaTNpUmlbUWqcosw s5kczsALLG/G0rwpT6qDvcIwW8mdLWYcPj21+eDpQEQEM5IKHnQi/O46EOJzS941VuIe qLHpKAnK9Du0o/9Ten+YivIbL2X+/5x06HQV/IvyAzhkAmi4+Ts0nkZc7D2ZIQRnfCJg FuTM7r/ulXyK07GtdpkDTg7KUl/0cyjOenLNqnLNckyEFVa2YdRuyKhbcdBW1AkOPKop IYMNyZC7/K0ay6ePCmy3L8p20xQ027C0Bhn9OJpQQSteihQPT1HBRs4zi9GPzhB5fQlQ NiOA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id u64-v6si14003975pfd.297.2018.07.25.06.45.25; Wed, 25 Jul 2018 06:45:26 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729375AbeGYO5D (ORCPT + 31 others); Wed, 25 Jul 2018 10:57:03 -0400 Received: from foss.arm.com ([217.140.101.70]:39022 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729308AbeGYO5C (ORCPT ); Wed, 25 Jul 2018 10:57:02 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 7DF2B15A2; Wed, 25 Jul 2018 06:45:17 -0700 (PDT) Received: from edgewater-inn.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 5044A3F6A8; Wed, 25 Jul 2018 06:45:17 -0700 (PDT) Received: by edgewater-inn.cambridge.arm.com (Postfix, from userid 1000) id 48CDA1AE0851; Wed, 25 Jul 2018 14:45:17 +0100 (BST) From: Will Deacon To: linux-kernel@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, arnd@arndb.de, linux@dominikbrodowski.net, ebiederm@xmission.com, akpm@linux-foundation.org, viro@zeniv.linux.org.uk, oleg@redhat.com, steve.mcintyre@arm.com, dave.martin@arm.com, Will Deacon Subject: [PATCH 0/2] Don't use SIGMINSTKSZ when enforcing alternative signal stack size for compat tasks Date: Wed, 25 Jul 2018 14:45:10 +0100 Message-Id: <1532526312-26993-1-git-send-email-will.deacon@arm.com> X-Mailer: git-send-email 2.1.4 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, The Debian folks have observed a failure in the 32-bit arm glibc testsuite when running under a 64-bit kernel. They tracked this down to sigaltstack(2) enforcing the alternative signal stack to be at least SIGMINSTKSZ bytes, which is higher for native arm64 tasks than compat 32-bit tasks. These patches resolve the issue by allowing an architecture to define COMPAT_SIGMINSTKSZ for compat tasks, which is then used by the sigaltstack checking code. Feedback welcome, Will --->8 Will Deacon (2): signal: Introduce COMPAT_SIGMINSTKSZ for use in compat_sys_sigaltstack arm64: compat: Provide definition for COMPAT_SIGMINSTKSZ arch/arm64/include/asm/compat.h | 1 + include/linux/compat.h | 3 +++ kernel/signal.c | 14 +++++++++----- 3 files changed, 13 insertions(+), 5 deletions(-) -- 2.1.4