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 33E42CDB483 for ; Sun, 15 Oct 2023 18:18:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229704AbjJOSST (ORCPT ); Sun, 15 Oct 2023 14:18:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38510 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229518AbjJOSST (ORCPT ); Sun, 15 Oct 2023 14:18:19 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DDB01B7 for ; Sun, 15 Oct 2023 11:18:17 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F06E9C433C9; Sun, 15 Oct 2023 18:18:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1697393897; bh=Uk/CTmFGAuTeG2VcEWhAljRoFX6wgWn0tnKqR1NiRPM=; h=Subject:To:Cc:From:Date:From; b=tFjv9+cgG9pkyw/ghEWirh3cmmyFY83JBx0+KJgOdsluN2npfwKZaFJU7uQnbHdiy yySoh5ADG2ndszpjIp/ORi8ILkfQLJXYhUSypbjQE6NZ0Bak6yMzP2/70/UT+jYdZJ a0jlWiuKNjTsXU/6flu8edwiI1Q2BBoGep5Y9JC8= Subject: FAILED: patch "[PATCH] x86/alternatives: Disable KASAN in apply_alternatives()" failed to apply to 5.10-stable tree To: kirill.shutemov@linux.intel.com, fei.yang@intel.com, mingo@kernel.org, peterz@infradead.org, torvalds@linux-foundation.org Cc: From: Date: Sun, 15 Oct 2023 20:17:51 +0200 Message-ID: <2023101551-eardrum-control-9aae@gregkh> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 5.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y git checkout FETCH_HEAD git cherry-pick -x d35652a5fc9944784f6f50a5c979518ff8dacf61 # git commit -s git send-email --to '' --in-reply-to '2023101551-eardrum-control-9aae@gregkh' --subject-prefix 'PATCH 5.10.y' HEAD^.. Possible dependencies: d35652a5fc99 ("x86/alternatives: Disable KASAN in apply_alternatives()") 6becb5026b81 ("x86/alternative: Make debug-alternative selective") ac0ee0a9560c ("x86/alternatives: Teach text_poke_bp() to patch Jcc.d32 instructions") 5d1dd961e743 ("x86/alternatives: Add alt_instr.flags") 931ab63664f0 ("x86/ibt: Implement FineIBT") b341b20d648b ("x86: Add prefix symbols for function padding") 3b6c1747da48 ("x86/retpoline: Add SKL retthunk retpolines") 52354973573c ("x86/asm: Provide ALTERNATIVE_3") eaf44c816ed8 ("x86/modules: Add call patching") e81dc127ef69 ("x86/callthunks: Add call patching for call depth tracking") 80e4c1cd42ff ("x86/retbleed: Add X86_FEATURE_CALL_DEPTH") bea75b33895f ("x86/Kconfig: Introduce function padding") 8f7c0d8b23c3 ("x86/Kconfig: Add CONFIG_CALL_THUNKS") 8eb5d34e77c6 ("x86/asm: Differentiate between code and function alignment") d49a0626216b ("arch: Introduce CONFIG_FUNCTION_ALIGNMENT") 8afc66e8d43b ("Merge tag 'kbuild-v6.1' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From d35652a5fc9944784f6f50a5c979518ff8dacf61 Mon Sep 17 00:00:00 2001 From: "Kirill A. Shutemov" Date: Thu, 12 Oct 2023 13:04:24 +0300 Subject: [PATCH] x86/alternatives: Disable KASAN in apply_alternatives() Fei has reported that KASAN triggers during apply_alternatives() on a 5-level paging machine: BUG: KASAN: out-of-bounds in rcu_is_watching() Read of size 4 at addr ff110003ee6419a0 by task swapper/0/0 ... __asan_load4() rcu_is_watching() trace_hardirqs_on() text_poke_early() apply_alternatives() ... On machines with 5-level paging, cpu_feature_enabled(X86_FEATURE_LA57) gets patched. It includes KASAN code, where KASAN_SHADOW_START depends on __VIRTUAL_MASK_SHIFT, which is defined with cpu_feature_enabled(). KASAN gets confused when apply_alternatives() patches the KASAN_SHADOW_START users. A test patch that makes KASAN_SHADOW_START static, by replacing __VIRTUAL_MASK_SHIFT with 56, works around the issue. Fix it for real by disabling KASAN while the kernel is patching alternatives. [ mingo: updated the changelog ] Fixes: 6657fca06e3f ("x86/mm: Allow to boot without LA57 if CONFIG_X86_5LEVEL=y") Reported-by: Fei Yang Signed-off-by: Kirill A. Shutemov Signed-off-by: Ingo Molnar Acked-by: Peter Zijlstra (Intel) Cc: Linus Torvalds Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20231012100424.1456-1-kirill.shutemov@linux.intel.com diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c index 517ee01503be..73be3931e4f0 100644 --- a/arch/x86/kernel/alternative.c +++ b/arch/x86/kernel/alternative.c @@ -403,6 +403,17 @@ void __init_or_module noinline apply_alternatives(struct alt_instr *start, u8 insn_buff[MAX_PATCH_LEN]; DPRINTK(ALT, "alt table %px, -> %px", start, end); + + /* + * In the case CONFIG_X86_5LEVEL=y, KASAN_SHADOW_START is defined using + * cpu_feature_enabled(X86_FEATURE_LA57) and is therefore patched here. + * During the process, KASAN becomes confused seeing partial LA57 + * conversion and triggers a false-positive out-of-bound report. + * + * Disable KASAN until the patching is complete. + */ + kasan_disable_current(); + /* * The scan order should be from start to end. A later scanned * alternative code can overwrite previously scanned alternative code. @@ -452,6 +463,8 @@ void __init_or_module noinline apply_alternatives(struct alt_instr *start, text_poke_early(instr, insn_buff, insn_buff_sz); } + + kasan_enable_current(); } static inline bool is_jcc32(struct insn *insn)