From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:35468 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751406AbeBWPmT (ORCPT ); Fri, 23 Feb 2018 10:42:19 -0500 Subject: Patch "arm64: fix warning about swapper_pg_dir overflow" has been added to the 4.9-stable tree To: arnd@arndb.de, ard.biesheuvel@linaro.org, catalin.marinas@arm.com, gregkh@linuxfoundation.org, mark.rutland@arm.com, will.deacon@arm.com Cc: , From: Date: Fri, 23 Feb 2018 16:42:15 +0100 In-Reply-To: <20180219101343.2922561-8-arnd@arndb.de> Message-ID: <151940053523578@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled arm64: fix warning about swapper_pg_dir overflow to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: arm64-fix-warning-about-swapper_pg_dir-overflow.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From foo@baz Fri Feb 23 16:40:21 CET 2018 From: Arnd Bergmann Date: Mon, 19 Feb 2018 11:13:26 +0100 Subject: arm64: fix warning about swapper_pg_dir overflow To: stable@vger.kernel.org Cc: Greg KH , linux-kernel@vger.kernel.org, Arnd Bergmann , Will Deacon , Catalin Marinas , Ard Biesheuvel , Mark Rutland , linux-arm-kernel@lists.infradead.org Message-ID: <20180219101343.2922561-8-arnd@arndb.de> From: Arnd Bergmann commit 12f043ff2b28fa64c9123b454cbe30a8a9e1967e upstream. With 4 levels of 16KB pages, we get this warning about the fact that we are copying a whole page into an array that is declared as having only two pointers for the top level of the page table: arch/arm64/mm/mmu.c: In function 'paging_init': arch/arm64/mm/mmu.c:528:2: error: 'memcpy' writing 16384 bytes into a region of size 16 overflows the destination [-Werror=stringop-overflow=] This is harmless since we actually reserve a whole page in the definition of the array that comes from, and just the extern declaration is short. The pgdir is initialized to zero either way, so copying the actual entries here seems like the best solution. Acked-by: Ard Biesheuvel Acked-by: Mark Rutland Signed-off-by: Arnd Bergmann Signed-off-by: Will Deacon [slightly adapted to apply on 4.9] Signed-off-by: Arnd Bergmann Signed-off-by: Greg Kroah-Hartman --- arch/arm64/mm/mmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -479,7 +479,7 @@ void __init paging_init(void) * To do this we need to go via a temporary pgd. */ cpu_replace_ttbr1(__va(pgd_phys)); - memcpy(swapper_pg_dir, pgd, PAGE_SIZE); + memcpy(swapper_pg_dir, pgd, PGD_SIZE); cpu_replace_ttbr1(swapper_pg_dir); pgd_clear_fixmap(); Patches currently in stable-queue which might be from arnd@arndb.de are queue-4.9/kasan-rework-kconfig-settings.patch queue-4.9/tw5864-use-dev_warn-instead-of-warn-to-shut-up-warning.patch queue-4.9/perf-x86-shut-up-false-positive-wmaybe-uninitialized-warning.patch queue-4.9/go7007-add-media_camera_support-dependency.patch queue-4.9/scsi-advansys-fix-build-warning-for-pci-n.patch queue-4.9/video-fbdev-via-remove-possibly-unused-variables.patch queue-4.9/drm-exynos-mark-pm-functions-as-__maybe_unused.patch queue-4.9/binfmt_elf-compat-avoid-unused-function-warning.patch queue-4.9/idle-i7300-add-pci-dependency.patch queue-4.9/cw1200-fix-bogus-maybe-uninitialized-warning.patch queue-4.9/x86-build-silence-the-build-with-make-s.patch queue-4.9/gpio-xgene-mark-pm-functions-as-__maybe_unused.patch queue-4.9/kvm-add-x86_local_apic-dependency.patch queue-4.9/reiserfs-avoid-a-wmaybe-uninitialized-warning.patch queue-4.9/scsi-advansys-fix-uninitialized-data-access.patch queue-4.9/drm-i915-fix-intel_backlight_device_register-declaration.patch queue-4.9/spi-bcm-qspi-shut-up-warning-about-cfi-header-inclusion.patch queue-4.9/asoc-ux500-add-module_license-tag.patch queue-4.9/x86-microcode-amd-change-load_microcode_amd-s-param-to-bool-to-fix-preemptibility-bug.patch queue-4.9/video-fbdev-mmp-add-module_license.patch queue-4.9/usb-phy-msm-add-regulator-dependency.patch queue-4.9/arm64-dts-add-cooling-cells-to-cpu-nodes.patch queue-4.9/vmxnet3-prevent-building-with-64k-pages.patch queue-4.9/x86-platform-add-pci-dependency-for-punit_atom_debug.patch queue-4.9/alsa-hda-ca0132-fix-possible-null-pointer-use.patch queue-4.9/thermal-fix-intel_soc_dts_iosf_core-dependencies.patch queue-4.9/arm64-define-bug-instruction-without-config_bug.patch queue-4.9/arm64-sunxi-always-enable-reset-controller.patch queue-4.9/tc358743-fix-register-i2c_rd-wr-functions.patch queue-4.9/security-keys-big_key-requires-config_crypto.patch queue-4.9/drm-i915-hide-unused-intel_panel_set_backlight-function.patch queue-4.9/x86-fpu-math-emu-fix-possible-uninitialized-variable-use.patch queue-4.9/arm-8743-1-bl_switcher-add-module_license-tag.patch queue-4.9/em28xx-only-use-mt9v011-if-camera-support-is-enabled.patch queue-4.9/arm64-fix-warning-about-swapper_pg_dir-overflow.patch queue-4.9/shmem-avoid-maybe-uninitialized-warning.patch queue-4.9/input-tca8418_keypad-hide-gcc-4.9-wmaybe-uninitialized-warning.patch queue-4.9/drm-nouveau-hide-gcc-4.9-wmaybe-uninitialized.patch queue-4.9/x86-add-multiuser-dependency-for-kvm.patch queue-4.9/isdn-eicon-reduce-stack-size-of-sig_ind-function.patch