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 6EB6EC433FE for ; Fri, 25 Mar 2022 22:42:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233996AbiCYWoP (ORCPT ); Fri, 25 Mar 2022 18:44:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52994 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233970AbiCYWn5 (ORCPT ); Fri, 25 Mar 2022 18:43:57 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8D73320C182 for ; Fri, 25 Mar 2022 15:42:18 -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 28138614BD for ; Fri, 25 Mar 2022 22:42:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 82EE7C004DD; Fri, 25 Mar 2022 22:42:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1648248137; bh=bxBcAtedRMVkLmIfKBq21fjEHF31WAp+Rrgp+j8lo0I=; h=Date:To:From:Subject:From; b=VKOfxsUK8bk9NUOVOryntBXtZcRmaGFlzJ8WYL/rEjUp1gv9Lzdas50bamwtI5PrB +gqPAJcE3LULeIfP5q4w+et6sCdGTqJ5HY90VNQZoXujyTv7QA2BFIvwqSwE8HUeo6 ylxTFKtZyEzppqVP/wrH7hpL2MHHAeEkQrhwTPcU= Date: Fri, 25 Mar 2022 15:42:16 -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-fork-reset-pointer-tags-of-vmapped-stacks.patch removed from -mm tree Message-Id: <20220325224217.82EE7C004DD@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, fork: reset pointer tags of vmapped stacks has been removed from the -mm tree. Its filename was kasan-fork-reset-pointer-tags-of-vmapped-stacks.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: Andrey Konovalov Subject: kasan, fork: reset pointer tags of vmapped stacks Once tag-based KASAN modes start tagging vmalloc() allocations, kernel stacks start getting tagged if CONFIG_VMAP_STACK is enabled. Reset the tag of kernel stack pointers after allocation in alloc_thread_stack_node(). For SW_TAGS KASAN, when CONFIG_KASAN_STACK is enabled, the instrumentation can't handle the SP register being tagged. For HW_TAGS KASAN, there's no instrumentation-related issues. However, the impact of having a tagged SP register needs to be properly evaluated, so keep it non-tagged for now. Note, that the memory for the stack allocation still gets tagged to catch vmalloc-into-stack out-of-bounds accesses. Link: https://lkml.kernel.org/r/c6c96f012371ecd80e1936509ebcd3b07a5956f7.1643047180.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov Reviewed-by: Alexander Potapenko Acked-by: Marco Elver 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 --- kernel/fork.c | 2 ++ 1 file changed, 2 insertions(+) --- a/kernel/fork.c~kasan-fork-reset-pointer-tags-of-vmapped-stacks +++ a/kernel/fork.c @@ -326,6 +326,8 @@ static int alloc_thread_stack_node(struc * so cache the vm_struct. */ tsk->stack_vm_area = vm; + if (stack) + stack = kasan_reset_tag(stack); tsk->stack = stack; return 0; } _ 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