From patchwork Mon Mar 22 16:02:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 12155337 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=-11.2 required=3.0 tests=BAYES_00,BOGUS_MIME_VERSION, DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 65778C433E6 for ; Mon, 22 Mar 2021 16:03:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 464ED619C1 for ; Mon, 22 Mar 2021 16:03:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231710AbhCVQDj (ORCPT ); Mon, 22 Mar 2021 12:03:39 -0400 Received: from mail.kernel.org ([198.145.29.99]:51622 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231493AbhCVQDB (ORCPT ); Mon, 22 Mar 2021 12:03:01 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 5B49F619A1; Mon, 22 Mar 2021 16:02:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1616428980; bh=443r2a53XZrLPy3VFDNzKFCONnuuJaVZhGXWFTRxMGo=; h=From:To:Cc:Subject:Date:From; b=Wm1CETPpBfKZZ3lkNCemLWeIZGtbFVmw4nKK+xzlHh6SjshNPJfKJvKmWNXvf1K/F 5o2Ww58tt6oERHDBipAS4BwOz2CJOvMh/uBNklODZ0dsfVzZt5cj7OrnLB7U+iYnI+ V9LYQbKfb8Z/fsl+P+r2cUIk2R08rZtGx280ke6EJyn8vt+7YkwV0naEM1o/sQwiUN Si9atqBgkFPNOL0NiRMLIEOjWWQ3UF2GIm92tB+iawDYiaDCLVZNub5gpWn3V4pP25 Ov3hZNHbzywOnT474a9kxX7y+Z8vSF7APRLbZu9IopXbelGoOeiLfQvjhYZz099ogD 8vEYHTLGBXuSg== From: Arnd Bergmann To: linux-kernel@vger.kernel.org, Martin Sebor Cc: Arnd Bergmann , x86@kernel.org, Ning Sun , Jani Nikula , Kalle Valo , Simon Kelley , James Smart , "James E.J. Bottomley" , Anders Larsen , Tejun Heo , Serge Hallyn , Imre Deak , linux-arm-kernel@lists.infradead.org, tboot-devel@lists.sourceforge.net, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, ath11k@lists.infradead.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, linux-scsi@vger.kernel.org, cgroups@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH 00/11] treewide: address gcc-11 -Wstringop-overread warnings Date: Mon, 22 Mar 2021 17:02:38 +0100 Message-Id: <20210322160253.4032422-1-arnd@kernel.org> X-Mailer: git-send-email 2.29.2 MIME-Version: 1. Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Arnd Bergmann The coming gcc release introduces a new warning for string operations reading beyond the end of a fixed-length object. After testing randconfig kernels for a while, think I have patches for any such warnings that came up on x86, arm and arm64. Most of these warnings are false-positive ones, either gcc warning about something that is entirely correct, or about something that looks suspicious but turns out to be correct after all. The two patches for the i915 driver look like something that might be actual bugs, but I am not sure about those either. We probably want some combination of workaround like the ones I post here and changes to gcc to have fewer false positives in the release. I'm posting the entire set of workaround that give me a cleanly building kernel for reference here. Arnd Arnd Bergmann (11): x86: compressed: avoid gcc-11 -Wstringop-overread warning x86: tboot: avoid Wstringop-overread-warning security: commoncap: fix -Wstringop-overread warning ath11: Wstringop-overread warning qnx: avoid -Wstringop-overread warning cgroup: fix -Wzero-length-bounds warnings ARM: sharpsl_param: work around -Wstringop-overread warning atmel: avoid gcc -Wstringop-overflow warning scsi: lpfc: fix gcc -Wstringop-overread warning drm/i915: avoid stringop-overread warning on pri_latency [RFC] drm/i915/dp: fix array overflow warning arch/arm/common/sharpsl_param.c | 4 ++- arch/x86/boot/compressed/misc.c | 2 -- arch/x86/kernel/tboot.c | 44 +++++++++++++++---------- drivers/gpu/drm/i915/display/intel_dp.c | 2 +- drivers/gpu/drm/i915/i915_drv.h | 6 ++-- drivers/net/wireless/ath/ath11k/mac.c | 2 +- drivers/net/wireless/atmel/atmel.c | 25 ++++++++------ drivers/scsi/lpfc/lpfc_attr.c | 6 ++-- fs/qnx4/dir.c | 11 +++---- kernel/cgroup/cgroup.c | 15 +++++++-- security/commoncap.c | 2 +- 11 files changed, 69 insertions(+), 50 deletions(-) Cc: x86@kernel.org Cc: Ning Sun Cc: Jani Nikula Cc: Kalle Valo Cc: Simon Kelley Cc: James Smart Cc: "James E.J. Bottomley" Cc: Anders Larsen Cc: Tejun Heo Cc: Serge Hallyn Cc: Imre Deak Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Cc: tboot-devel@lists.sourceforge.net Cc: intel-gfx@lists.freedesktop.org Cc: dri-devel@lists.freedesktop.org Cc: ath11k@lists.infradead.org Cc: linux-wireless@vger.kernel.org Cc: netdev@vger.kernel.org Cc: linux-scsi@vger.kernel.org Cc: cgroups@vger.kernel.org Cc: linux-security-module@vger.kernel.org