From mboxrd@z Thu Jan 1 00:00:00 1970 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 36EFDC4332F for ; Fri, 25 Mar 2022 22:42:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234002AbiCYWoV (ORCPT ); Fri, 25 Mar 2022 18:44:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52960 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233953AbiCYWn4 (ORCPT ); Fri, 25 Mar 2022 18:43:56 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 95BBB20A946 for ; Fri, 25 Mar 2022 15:42:05 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 309CE614DE for ; Fri, 25 Mar 2022 22:42:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 877DEC004DD; Fri, 25 Mar 2022 22:42:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1648248124; bh=1PVhabPIWNOU6UdktGLe6f7lQEY4JVIfWLPjolSGGoY=; h=Date:To:From:Subject:From; b=RZbZpD/HnR7zLPDhONZKKWrmJTNnn91xM5yJKu4ZLrzVeEMNrzdwaSsJI2FN9QdpN QpmN8+zw2sDjkpv9k66VDqRCsBcG6VhYTaLqrX0t127/tDfA4i2SdrvBMrlcvAU8c3 U/9C51ery+eKmlwwtXm1T+AW9doauIYzmS7FxZNM= Date: Fri, 25 Mar 2022 15:42:03 -0700 To: mm-commits@vger.kernel.org, will@kernel.org, vincenzo.frascino@arm.com, ryabinin.a.a@gmail.com, pcc@google.com, mark.rutland@arm.com, glider@google.com, eugenis@google.com, elver@google.com, dvyukov@google.com, catalin.marinas@arm.com, andreyknvl@google.com, akpm@linux-foundation.org From: Andrew Morton Subject: [merged] kasan-page_alloc-merge-kasan_alloc_pages-into-post_alloc_hook.patch removed from -mm tree Message-Id: <20220325224204.877DEC004DD@smtp.kernel.org> Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org The patch titled Subject: kasan, page_alloc: merge kasan_alloc_pages into post_alloc_hook has been removed from the -mm tree. Its filename was kasan-page_alloc-merge-kasan_alloc_pages-into-post_alloc_hook.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: Andrey Konovalov Subject: kasan, page_alloc: merge kasan_alloc_pages into post_alloc_hook Currently, the code responsible for initializing and poisoning memory in post_alloc_hook() is scattered across two locations: kasan_alloc_pages() hook for HW_TAGS KASAN and post_alloc_hook() itself. This is confusing. This and a few following patches combine the code from these two locations. Along the way, these patches do a step-by-step restructure the many performed checks to make them easier to follow. Replace the only caller of kasan_alloc_pages() with its implementation. As kasan_has_integrated_init() is only true when CONFIG_KASAN_HW_TAGS is enabled, moving the code does no functional changes. Also move init and init_tags variables definitions out of kasan_has_integrated_init() clause in post_alloc_hook(), as they have the same values regardless of what the if condition evaluates to. This patch is not useful by itself but makes the simplifications in the following patches easier to follow. Link: https://lkml.kernel.org/r/5ac7e0b30f5cbb177ec363ddd7878a3141289592.1643047180.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov Acked-by: Marco Elver Cc: Alexander Potapenko Cc: Andrey Ryabinin Cc: Catalin Marinas Cc: Dmitry Vyukov Cc: Evgenii Stepanov Cc: Mark Rutland Cc: Peter Collingbourne Cc: Vincenzo Frascino Cc: Will Deacon Signed-off-by: Andrew Morton --- include/linux/kasan.h | 9 --------- mm/kasan/common.c | 2 +- mm/kasan/hw_tags.c | 22 ---------------------- mm/page_alloc.c | 20 +++++++++++++++----- 4 files changed, 16 insertions(+), 37 deletions(-) --- a/include/linux/kasan.h~kasan-page_alloc-merge-kasan_alloc_pages-into-post_alloc_hook +++ a/include/linux/kasan.h @@ -84,17 +84,8 @@ static inline void kasan_disable_current #ifdef CONFIG_KASAN_HW_TAGS -void kasan_alloc_pages(struct page *page, unsigned int order, gfp_t flags); - #else /* CONFIG_KASAN_HW_TAGS */ -static __always_inline void kasan_alloc_pages(struct page *page, - unsigned int order, gfp_t flags) -{ - /* Only available for integrated init. */ - BUILD_BUG(); -} - #endif /* CONFIG_KASAN_HW_TAGS */ static inline bool kasan_has_integrated_init(void) --- a/mm/kasan/common.c~kasan-page_alloc-merge-kasan_alloc_pages-into-post_alloc_hook +++ a/mm/kasan/common.c @@ -538,7 +538,7 @@ void * __must_check __kasan_kmalloc_larg return NULL; /* - * The object has already been unpoisoned by kasan_alloc_pages() for + * The object has already been unpoisoned by kasan_unpoison_pages() for * alloc_pages() or by kasan_krealloc() for krealloc(). */ --- a/mm/kasan/hw_tags.c~kasan-page_alloc-merge-kasan_alloc_pages-into-post_alloc_hook +++ a/mm/kasan/hw_tags.c @@ -192,28 +192,6 @@ void __init kasan_init_hw_tags(void) kasan_stack_collection_enabled() ? "on" : "off"); } -void kasan_alloc_pages(struct page *page, unsigned int order, gfp_t flags) -{ - /* - * This condition should match the one in post_alloc_hook() in - * page_alloc.c. - */ - bool init = !want_init_on_free() && want_init_on_alloc(flags); - bool init_tags = init && (flags & __GFP_ZEROTAGS); - - if (flags & __GFP_SKIP_KASAN_POISON) - SetPageSkipKASanPoison(page); - - if (init_tags) { - int i; - - for (i = 0; i != 1 << order; ++i) - tag_clear_highpage(page + i); - } else { - kasan_unpoison_pages(page, order, init); - } -} - #if IS_ENABLED(CONFIG_KASAN_KUNIT_TEST) void kasan_enable_tagging_sync(void) --- a/mm/page_alloc.c~kasan-page_alloc-merge-kasan_alloc_pages-into-post_alloc_hook +++ a/mm/page_alloc.c @@ -2346,6 +2346,9 @@ static inline bool check_new_pcp(struct inline void post_alloc_hook(struct page *page, unsigned int order, gfp_t gfp_flags) { + bool init = !want_init_on_free() && want_init_on_alloc(gfp_flags); + bool init_tags = init && (gfp_flags & __GFP_ZEROTAGS); + set_page_private(page, 0); set_page_refcounted(page); @@ -2361,15 +2364,22 @@ inline void post_alloc_hook(struct page /* * As memory initialization might be integrated into KASAN, - * kasan_alloc_pages and kernel_init_free_pages must be + * KASAN unpoisoning and memory initializion code must be * kept together to avoid discrepancies in behavior. */ if (kasan_has_integrated_init()) { - kasan_alloc_pages(page, order, gfp_flags); - } else { - bool init = !want_init_on_free() && want_init_on_alloc(gfp_flags); - bool init_tags = init && (gfp_flags & __GFP_ZEROTAGS); + if (gfp_flags & __GFP_SKIP_KASAN_POISON) + SetPageSkipKASanPoison(page); + if (init_tags) { + int i; + + for (i = 0; i != 1 << order; ++i) + tag_clear_highpage(page + i); + } else { + kasan_unpoison_pages(page, order, init); + } + } else { kasan_unpoison_pages(page, order, init); if (init_tags) { _ Patches currently in -mm which might be from andreyknvl@google.com are stacktrace-add-interface-based-on-shadow-call-stack.patch arm64-scs-save-scs_sp-values-per-cpu-when-switching-stacks.patch arm64-implement-stack_trace_save_shadow.patch kasan-use-stack_trace_save_shadow.patch