From patchwork Mon Dec 20 21:58:15 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: 12688685 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 8ED6AC433EF for ; Mon, 20 Dec 2021 21:59:01 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 13B976B0073; Mon, 20 Dec 2021 16:59:01 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 0ECE46B0074; Mon, 20 Dec 2021 16:59:01 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id ECE566B0075; Mon, 20 Dec 2021 16:59:00 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0248.hostedemail.com [216.40.44.248]) by kanga.kvack.org (Postfix) with ESMTP id DA1D46B0073 for ; Mon, 20 Dec 2021 16:59:00 -0500 (EST) Received: from smtpin30.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 9B90B18035458 for ; Mon, 20 Dec 2021 21:59:00 +0000 (UTC) X-FDA: 78939538440.30.506CE77 Received: from out2.migadu.com (out2.migadu.com [188.165.223.204]) by imf15.hostedemail.com (Postfix) with ESMTP id 44712A0030 for ; Mon, 20 Dec 2021 21:58:53 +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=1640037537; 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=wFLMQEsPdiKisCnArFXJzf90NsxTel/o3MOusffYrQE=; b=DO86EmQzI33B0mpbsTG6LS6zJfuzjOObFrFWSjiO48ABLYoQZMF7L/Yetd+Biy+xSYbeDC 7Xv8Y/dFg+kJyJcesW3kcubiY6/QmYt+BW7cGOLWDJ7k5BZcPHV2S4bfU+mDZbSmwl2qBk 36B6e4jw0G3OVjsLkv5RbKUgoBEyz38= From: andrey.konovalov@linux.dev To: Marco Elver , Alexander Potapenko , Andrew Morton Cc: Andrey Konovalov , Dmitry Vyukov , Andrey Ryabinin , kasan-dev@googlegroups.com, linux-mm@kvack.org, Vincenzo Frascino , Catalin Marinas , Will Deacon , Mark Rutland , linux-arm-kernel@lists.infradead.org, Peter Collingbourne , Evgenii Stepanov , linux-kernel@vger.kernel.org, Andrey Konovalov Subject: [PATCH mm v4 00/39] kasan, vmalloc, arm64: add vmalloc tagging support for SW/HW_TAGS Date: Mon, 20 Dec 2021 22:58:15 +0100 Message-Id: MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-Migadu-Auth-User: linux.dev Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=DO86EmQz; spf=pass (imf15.hostedemail.com: domain of andrey.konovalov@linux.dev designates 188.165.223.204 as permitted sender) smtp.mailfrom=andrey.konovalov@linux.dev; dmarc=pass (policy=none) header.from=linux.dev X-Rspamd-Queue-Id: 44712A0030 X-Stat-Signature: c3r64dpjkcesqbtqncj376rqa6n7wioa X-Rspamd-Server: rspam04 X-HE-Tag: 1640037533-202084 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-v4-akpm 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. 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 v3->v4: - Rebase onto fresh mm. - Rename KASAN_VMALLOC_NOEXEC to KASAN_VMALLOC_PROT_NORMAL. - Compare prot with PAGE_KERNEL instead of using pgprot_nx() to indentify normal non-executable mappings. - Rename arch_vmalloc_pgprot_modify() to arch_vmap_pgprot_tagged(). - Move checks from arch_vmap_pgprot_tagged() to __vmalloc_node_range() as the same condition is used for other things in subsequent patches. - Use proper kasan_hw_tags_enabled() checks instead of IS_ENABLED(CONFIG_KASAN_HW_TAGS). - Set __GFP_SKIP_KASAN_UNPOISON and __GFP_SKIP_ZERO flags instead of resetting. - Only define KASAN GFP flags when when HW_TAGS KASAN is enabled. - Move setting KASAN GFP flags to __vmalloc_node_range() and do it only for normal non-executable mapping when HW_TAGS KASAN is enabled. - Add new GFP flags to include/trace/events/mmflags.h. - Don't forget to save tagged addr to vm_struct->addr for VM_ALLOC so that find_vm_area(addr)->addr == addr for vmalloc(). - Reset pointer tag in change_memory_common(). - Add test checks for set_memory_*() on vmalloc() allocations. - Minor patch descriptions and comments fixes. Changes in v2->v3: - Rebase onto mm. - New patch: "kasan, arm64: reset pointer tags of vmapped stacks". - New patch: "kasan, vmalloc: don't tag executable vmalloc allocations". - New patch: "kasan, arm64: don't tag executable vmalloc allocations". - Allowing enabling KASAN_VMALLOC with SW/HW_TAGS is moved to "kasan: allow enabling KASAN_VMALLOC and SW/HW_TAGS", as this can only be done once executable allocations are no longer tagged. - Minor fixes, see patches for lists of changes. 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 (39): 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: rework 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: reset pointer tags of vmapped stacks kasan, arm64: reset pointer tags of vmapped stacks kasan, vmalloc: add vmalloc tagging for SW_TAGS kasan, vmalloc, arm64: mark vmalloc mappings as pgprot_tagged kasan, vmalloc: unpoison VM_ALLOC pages after mapping kasan, mm: only define ___GFP_SKIP_KASAN_POISON with HW_TAGS kasan, page_alloc: allow skipping unpoisoning for HW_TAGS kasan, page_alloc: allow skipping memory init for HW_TAGS kasan, vmalloc: add vmalloc tagging for HW_TAGS kasan, vmalloc: only tag normal vmalloc allocations kasan, arm64: don't tag executable vmalloc allocations kasan: mark kasan_arg_stacktrace as __initdata kasan: simplify kasan_init_hw_tags kasan: add kasan.vmalloc command line flag kasan: allow enabling KASAN_VMALLOC and SW/HW_TAGS 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 | 6 + arch/arm64/include/asm/vmap_stack.h | 5 +- arch/arm64/kernel/module.c | 5 +- arch/arm64/mm/pageattr.c | 2 +- arch/arm64/net/bpf_jit_comp.c | 3 +- arch/s390/kernel/module.c | 2 +- arch/x86/kernel/module.c | 2 +- include/linux/gfp.h | 38 ++++-- include/linux/kasan.h | 97 ++++++++------ include/linux/vmalloc.h | 18 ++- include/trace/events/mmflags.h | 15 ++- kernel/fork.c | 1 + kernel/scs.c | 4 +- lib/Kconfig.kasan | 20 +-- lib/test_kasan.c | 189 +++++++++++++++++++++++++++- mm/kasan/common.c | 4 +- mm/kasan/hw_tags.c | 167 +++++++++++++++++++----- mm/kasan/kasan.h | 16 ++- mm/kasan/shadow.c | 63 ++++++---- mm/page_alloc.c | 157 ++++++++++++++++------- mm/vmalloc.c | 99 ++++++++++++--- 23 files changed, 721 insertions(+), 211 deletions(-) Acked-by: Marco Elver