From patchwork Mon Dec 6 21:22:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: andrey.konovalov@linux.dev X-Patchwork-Id: 12659707 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id AB688C433F5 for ; Mon, 6 Dec 2021 21:23:21 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 242B36B0089; Mon, 6 Dec 2021 16:23:11 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 1C1A06B0088; Mon, 6 Dec 2021 16:23:11 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 011F56B0085; Mon, 6 Dec 2021 16:23:10 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0022.hostedemail.com [216.40.44.22]) by kanga.kvack.org (Postfix) with ESMTP id DFC2C6B006C for ; Mon, 6 Dec 2021 16:23:10 -0500 (EST) Received: from smtpin15.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id A8EA2181953F4 for ; Mon, 6 Dec 2021 21:23:00 +0000 (UTC) X-FDA: 78888644520.15.E4642A1 Received: from out0.migadu.com (out0.migadu.com [94.23.1.103]) by imf24.hostedemail.com (Postfix) with ESMTP id E19E5B0000A0 for ; Mon, 6 Dec 2021 21:22:59 +0000 (UTC) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1638825777; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=bUuIlOralgF5wobuBntA8UszOUI4AIJ5c+Gdq5HnW/w=; b=ov4ZlEF7HlHN4qESa77lsG4wrX/EXUpAmXawqVClVAFLyCHdkWGwYFs09sNB3FC9hS/bev KKGJT/hyfMp9Z15N98g9Pjw56z18AMYVWJln1MpFMI17UtpgHsU39p8+ZcuDjcaSJVrZp/ UjyXBGoaPsNIBi8SibBR0OgoAImVHIk= From: andrey.konovalov@linux.dev To: Marco Elver , Alexander Potapenko , Vincenzo Frascino , Catalin Marinas , Peter Collingbourne Cc: Andrey Konovalov , Dmitry Vyukov , Andrey Ryabinin , kasan-dev@googlegroups.com, Andrew Morton , linux-mm@kvack.org, Will Deacon , Mark Rutland , linux-arm-kernel@lists.infradead.org, Evgenii Stepanov , linux-kernel@vger.kernel.org, Andrey Konovalov Subject: [PATCH v2 00/34] kasan, vmalloc, arm64: add vmalloc tagging support for SW/HW_TAGS Date: Mon, 6 Dec 2021 22:22:04 +0100 Message-Id: MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: linux.dev X-Stat-Signature: aybien34hqpwa6fhm7rb8x1m6hbzccf3 Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=ov4ZlEF7; spf=pass (imf24.hostedemail.com: domain of andrey.konovalov@linux.dev designates 94.23.1.103 as permitted sender) smtp.mailfrom=andrey.konovalov@linux.dev; dmarc=pass (policy=none) header.from=linux.dev X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: E19E5B0000A0 X-HE-Tag: 1638825779-254362 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: From: Andrey Konovalov Hi, This patchset adds vmalloc tagging support for SW_TAGS and HW_TAGS KASAN modes. The tree with patches is available here: https://github.com/xairy/linux/tree/up-kasan-vmalloc-tags-v2 About half of patches are cleanups I went for along the way. None of them seem to be important enough to go through stable, so I decided not to split them out into separate patches/series. I'll keep the patchset based on the mainline for now. Once the high-level issues are resolved, I'll rebase onto mm - there might be a few conflicts right now. The patchset is partially based on an early version of the HW_TAGS patchset by Vincenzo that had vmalloc support. Thus, I added a Co-developed-by tag into a few patches. SW_TAGS vmalloc tagging support is straightforward. It reuses all of the generic KASAN machinery, but uses shadow memory to store tags instead of magic values. Naturally, vmalloc tagging requires adding a few kasan_reset_tag() annotations to the vmalloc code. HW_TAGS vmalloc tagging support stands out. HW_TAGS KASAN is based on Arm MTE, which can only assigns tags to physical memory. As a result, HW_TAGS KASAN only tags vmalloc() allocations, which are backed by page_alloc memory. It ignores vmap() and others. Changes in v1->v2: - Move memory init for vmalloc() into vmalloc code for HW_TAGS KASAN. - Minor fixes and code reshuffling, see patches for lists of changes. Thanks! Andrey Konovalov (34): kasan, page_alloc: deduplicate should_skip_kasan_poison kasan, page_alloc: move tag_clear_highpage out of kernel_init_free_pages kasan, page_alloc: merge kasan_free_pages into free_pages_prepare kasan, page_alloc: simplify kasan_poison_pages call site kasan, page_alloc: init memory of skipped pages on free kasan: drop skip_kasan_poison variable in free_pages_prepare mm: clarify __GFP_ZEROTAGS comment kasan: only apply __GFP_ZEROTAGS when memory is zeroed kasan, page_alloc: refactor init checks in post_alloc_hook kasan, page_alloc: merge kasan_alloc_pages into post_alloc_hook kasan, page_alloc: combine tag_clear_highpage calls in post_alloc_hook kasan, page_alloc: move SetPageSkipKASanPoison in post_alloc_hook kasan, page_alloc: move kernel_init_free_pages in post_alloc_hook kasan, page_alloc: simplify kasan_unpoison_pages call site kasan: clean up metadata byte definitions kasan: define KASAN_VMALLOC_INVALID for SW_TAGS kasan, x86, arm64, s390: rename functions for modules shadow kasan, vmalloc: drop outdated VM_KASAN comment kasan: reorder vmalloc hooks kasan: add wrappers for vmalloc hooks kasan, vmalloc: reset tags in vmalloc functions kasan, fork: don't tag stacks allocated with vmalloc kasan, vmalloc: add vmalloc support to SW_TAGS kasan, vmalloc, arm64: mark vmalloc mappings as pgprot_tagged kasan, vmalloc: don't unpoison VM_ALLOC pages before mapping kasan, page_alloc: allow skipping unpoisoning for HW_TAGS kasan, page_alloc: allow skipping memory init for HW_TAGS kasan, vmalloc: add vmalloc support to HW_TAGS kasan: mark kasan_arg_stacktrace as __initdata kasan: simplify kasan_init_hw_tags kasan: add kasan.vmalloc command line flag arm64: select KASAN_VMALLOC for SW/HW_TAGS modes kasan: documentation updates kasan: improve vmalloc tests Documentation/dev-tools/kasan.rst | 17 ++- arch/arm64/Kconfig | 2 +- arch/arm64/include/asm/vmalloc.h | 10 ++ arch/arm64/kernel/module.c | 2 +- arch/s390/kernel/module.c | 2 +- arch/x86/kernel/module.c | 2 +- include/linux/gfp.h | 28 +++-- include/linux/kasan.h | 91 +++++++++------ include/linux/vmalloc.h | 18 ++- kernel/fork.c | 1 + lib/Kconfig.kasan | 20 ++-- lib/test_kasan.c | 181 +++++++++++++++++++++++++++++- mm/kasan/common.c | 4 +- mm/kasan/hw_tags.c | 157 +++++++++++++++++++++----- mm/kasan/kasan.h | 16 ++- mm/kasan/shadow.c | 57 ++++++---- mm/page_alloc.c | 150 +++++++++++++++++-------- mm/vmalloc.c | 72 ++++++++++-- 18 files changed, 631 insertions(+), 199 deletions(-)