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Peter Anvin" , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Lorenzo Stoakes , Paul Walmsley , Palmer Dabbelt , Albert Ou , Conor Dooley , Rob Herring , Krzysztof Kozlowski , Arnd Bergmann , Christian Brauner , Peter Zijlstra , Oleg Nesterov , Eric Biederman , Kees Cook , Jonathan Corbet , Shuah Khan , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, alistair.francis@wdc.com, richard.henderson@linaro.org, jim.shu@sifive.com, andybnac@gmail.com, kito.cheng@sifive.com, charlie@rivosinc.com, atishp@rivosinc.com, evan@rivosinc.com, cleger@rivosinc.com, alexghiti@rivosinc.com, samitolvanen@google.com, broonie@kernel.org, rick.p.edgecombe@intel.com Subject: Re: [PATCH v8 24/29] riscv: enable kernel access to shadow stack memory via FWFT sbi call Message-ID: References: <20241111-v5_user_cfi_series-v8-0-dce14aa30207@rivosinc.com> <20241111-v5_user_cfi_series-v8-24-dce14aa30207@rivosinc.com> Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Thu, Nov 14, 2024 at 09:20:14AM +0800, Nick Hu wrote: >Hi Deepak > >On Thu, Nov 14, 2024 at 9:06 AM Deepak Gupta wrote: >> >> On Thu, Nov 14, 2024 at 12:13:38AM +0800, Nick Hu wrote: >> >Hi Deepak >> > >> >On Tue, Nov 12, 2024 at 5:08 AM Deepak Gupta wrote: >> >> >> >> Kernel will have to perform shadow stack operations on user shadow stack. >> >> Like during signal delivery and sigreturn, shadow stack token must be >> >> created and validated respectively. Thus shadow stack access for kernel >> >> must be enabled. >> >> >> >> In future when kernel shadow stacks are enabled for linux kernel, it must >> >> be enabled as early as possible for better coverage and prevent imbalance >> >> between regular stack and shadow stack. After `relocate_enable_mmu` has >> >> been done, this is as early as possible it can enabled. >> >> >> >> Signed-off-by: Deepak Gupta >> >> --- >> >> arch/riscv/kernel/asm-offsets.c | 4 ++++ >> >> arch/riscv/kernel/head.S | 12 ++++++++++++ >> >> 2 files changed, 16 insertions(+) >> >> >> >> diff --git a/arch/riscv/kernel/asm-offsets.c b/arch/riscv/kernel/asm-offsets.c >> >> index 766bd33f10cb..a22ab8a41672 100644 >> >> --- a/arch/riscv/kernel/asm-offsets.c >> >> +++ b/arch/riscv/kernel/asm-offsets.c >> >> @@ -517,4 +517,8 @@ void asm_offsets(void) >> >> DEFINE(FREGS_A6, offsetof(struct ftrace_regs, a6)); >> >> DEFINE(FREGS_A7, offsetof(struct ftrace_regs, a7)); >> >> #endif >> >> + DEFINE(SBI_EXT_FWFT, SBI_EXT_FWFT); >> >> + DEFINE(SBI_EXT_FWFT_SET, SBI_EXT_FWFT_SET); >> >> + DEFINE(SBI_FWFT_SHADOW_STACK, SBI_FWFT_SHADOW_STACK); >> >> + DEFINE(SBI_FWFT_SET_FLAG_LOCK, SBI_FWFT_SET_FLAG_LOCK); >> >> } >> >> diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S >> >> index 356d5397b2a2..6244408ca917 100644 >> >> --- a/arch/riscv/kernel/head.S >> >> +++ b/arch/riscv/kernel/head.S >> >> @@ -164,6 +164,12 @@ secondary_start_sbi: >> >> call relocate_enable_mmu >> >> #endif >> >> call .Lsetup_trap_vector >> >> + li a7, SBI_EXT_FWFT >> >> + li a6, SBI_EXT_FWFT_SET >> >> + li a0, SBI_FWFT_SHADOW_STACK >> >> + li a1, 1 /* enable supervisor to access shadow stack access */ >> >> + li a2, SBI_FWFT_SET_FLAG_LOCK >> >> + ecall >> >> scs_load_current >> >> call smp_callin >> >> #endif /* CONFIG_SMP */ >> >> @@ -320,6 +326,12 @@ SYM_CODE_START(_start_kernel) >> >> la tp, init_task >> >> la sp, init_thread_union + THREAD_SIZE >> >> addi sp, sp, -PT_SIZE_ON_STACK >> >> + li a7, SBI_EXT_FWFT >> >> + li a6, SBI_EXT_FWFT_SET >> >> + li a0, SBI_FWFT_SHADOW_STACK >> >> + li a1, 1 /* enable supervisor to access shadow stack access */ >> >> + li a2, SBI_FWFT_SET_FLAG_LOCK >> >> + ecall >> >> scs_load_current >> >> >> >> #ifdef CONFIG_KASAN >> >> >> >> -- >> >> 2.45.0 >> >> >> >Should we clear the SBI_FWFT_SET_FLAG_LOCK before the cpu hotplug >> >otherwise the menvcfg.sse won't be set by the fwft set sbi call when >> >the hotplug cpu back to kernel? >> >> Hmm... >> >> An incoming hotplug CPU has no features setup on it. >> I see that `sbi_cpu_start` will supply `secondary_start_sbi` as start >> up code for incoming CPU. `secondary_start_sbi` is in head.S which converges >> in `.Lsecondary_start_common`. And thus hotplugged CPU should be >> issuing shadow stack set FWFT sbi as well. >> >> Am I missing something ? >> >This is the correct flow. However the opensbi will deny it due to the >SBI_FWFT_SET_FLAG_LOCK already being set. >So the menvcfg.sse will not set by this flow. > >if (conf->flags & SBI_FWFT_SET_FLAG_LOCK) > return SBI_EDENIED; > hmm... Why? `conf` is pointing to per-hart state in firmware. On this incoming cpu, opensbi (or equivalent) firmware must have ensured that this per-hart state doesn't have lock set. Am I missing something? >Regards, >Nick >> > >> >Regards, >> >Nick >> >> >> >> _______________________________________________ >> >> linux-riscv mailing list >> >> linux-riscv@lists.infradead.org >> >> http://lists.infradead.org/mailman/listinfo/linux-riscv 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A2FBFD637CF for ; Thu, 14 Nov 2024 01:25:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=6ILtxl61nvte38Kpfe0RPwrJIXNNrfSMRJxeU2WouOk=; b=f2cigHdHHVdUOBRZQM5aQObqxC xJ3YNf5uD1X24yRq8bjo35Qa70s2GwkSF+JYQgu5sstdaHWI8WlWjUN2qPJ2mFXBh1/9IFwg/7Yud NWGor4PvsibdQnWFfn6hrsG+Pmj2vnsJ4buTMPLRq112bvP1S6vk/w2DDVhAK1dhiTY2V5TOxwTdZ 5ttnvha80MtRewzGG9yhMI5MbSon0U6x7AXT0q2bMk05dHdvqhgSPl647+ji02tFaAz18G/ynImTg caOTCL5oxLFmFW1ckvfc1Diyke6x2/9cEEWjSDImRJfg8du9KN+7bfo48u3yhYeC+MJqC7fK2Fa4Q cNUAwEzw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tBObc-00000008QhQ-3aBy; Thu, 14 Nov 2024 01:25:08 +0000 Received: from mail-oi1-x231.google.com ([2607:f8b0:4864:20::231]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tBObZ-00000008Qg9-1KXA for linux-riscv@lists.infradead.org; Thu, 14 Nov 2024 01:25:07 +0000 Received: by mail-oi1-x231.google.com with SMTP id 5614622812f47-3e60d3adecbso37453b6e.2 for ; Wed, 13 Nov 2024 17:25:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1731547504; x=1732152304; darn=lists.infradead.org; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date:from:to :cc:subject:date:message-id:reply-to; bh=7tgZBsjLXLWa/QitrFWyk7TGNAjpHhq1mYxI46BDfkY=; b=zVvWQfYFxWOa/ebHVMOHGDoTb91Vzotuf3Lh38zfpuPMDWpIb4COSpHXacVX163LoZ /GZE+bszLKvUj1yGAxk/jccFdZE72ZaThuBHtlCya/1cxJQOPh2SvjfFpJBInspDlhpH locnbWWbpSs00qcqLlC5UYCVUB2GCpXTM22tYdUtHVofz1MogB7gqpxQsUPiJ+eaCQ+R bdONUhqE5OAcGlV5elNpZ8PCFB954uDMKoERZ7Nbuv4v2S8Yl3jd5hgVYvqtrrztaCwe YF88FmYgEVB+58XnRCFIUaZ4OYVLO1DyvMhI/zGR1g+Z0wGwikuGZxRvtLR6jBVrsxeI 4UcA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731547504; x=1732152304; h=in-reply-to:content-transfer-encoding:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=7tgZBsjLXLWa/QitrFWyk7TGNAjpHhq1mYxI46BDfkY=; b=gkjvxZ5x3bMaTRGEk6M7PJZfLl3x1JfbCJhMqKffjC3egKADy4q78dxRM1bxlzqLdb Cp+K6oR+rA0gVdictgf31eacia4yz3ad8nW27p4TvDOv0EqpEzZs6hz05VRdq9eddFyQ B7Q2w4CkC28SBExX8x8xh0opoF+Mf5WOhuIBgSeAYbAx6LAtCPuDREdWQg+Sorq8sHy2 wy5xOkHb2EzdjWx7kgjHsVXG9Q7/rbv9lPtdjK2viozT6i5w5v7l80QD5ggyXYNc2zkf 0ur7PpkcykoR7yNNF/Fck4+BQ2yI1bbo/BTOPLyNAhjGxvbCt37rsHEt2UdGyVE7eoJX 5KqA== X-Forwarded-Encrypted: i=1; AJvYcCWDLdvWr6eJppPFUNft3ufntQlqqPveV6B6JH+oid9NYnFx7SD5NWZC/KoOAeDsPQOKGI8FIbXcUTFZyA==@lists.infradead.org X-Gm-Message-State: AOJu0Ywmrnklxzm6FqoKQa6eQUH6V7CUFh/hOhCQQO5rWtOo4sD5J19y WjXk3qYd1USO1MUd/fFPgbuuV29J9/njfDIIAcvrjjqEIO09njA7VSBRwLHIDrU= X-Google-Smtp-Source: AGHT+IFYV+lyD6AUZ64wWkmaKdb2jE8s1l+YlxE25IyFaRji6Gg+al5X5KNPM0lWiRmirmHIFmzF1w== X-Received: by 2002:a05:6808:2222:b0:3e6:22f:ea48 with SMTP id 5614622812f47-3e7b7bdede7mr481448b6e.28.1731547504098; Wed, 13 Nov 2024 17:25:04 -0800 (PST) Received: from debug.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7f41f5bcad0sm11125410a12.32.2024.11.13.17.25.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Nov 2024 17:25:03 -0800 (PST) Date: Wed, 13 Nov 2024 17:25:00 -0800 From: Deepak Gupta To: Nick Hu Cc: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Lorenzo Stoakes , Paul Walmsley , Palmer Dabbelt , Albert Ou , Conor Dooley , Rob Herring , Krzysztof Kozlowski , Arnd Bergmann , Christian Brauner , Peter Zijlstra , Oleg Nesterov , Eric Biederman , Kees Cook , Jonathan Corbet , Shuah Khan , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-arch@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, alistair.francis@wdc.com, richard.henderson@linaro.org, jim.shu@sifive.com, andybnac@gmail.com, kito.cheng@sifive.com, charlie@rivosinc.com, atishp@rivosinc.com, evan@rivosinc.com, cleger@rivosinc.com, alexghiti@rivosinc.com, samitolvanen@google.com, broonie@kernel.org, rick.p.edgecombe@intel.com Subject: Re: [PATCH v8 24/29] riscv: enable kernel access to shadow stack memory via FWFT sbi call Message-ID: References: <20241111-v5_user_cfi_series-v8-0-dce14aa30207@rivosinc.com> <20241111-v5_user_cfi_series-v8-24-dce14aa30207@rivosinc.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241113_172505_391432_E63BAB45 X-CRM114-Status: GOOD ( 21.70 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org T24gVGh1LCBOb3YgMTQsIDIwMjQgYXQgMDk6MjA6MTRBTSArMDgwMCwgTmljayBIdSB3cm90ZToK PkhpIERlZXBhawo+Cj5PbiBUaHUsIE5vdiAxNCwgMjAyNCBhdCA5OjA24oCvQU0gRGVlcGFrIEd1 cHRhIDxkZWJ1Z0ByaXZvc2luYy5jb20+IHdyb3RlOgo+Pgo+PiBPbiBUaHUsIE5vdiAxNCwgMjAy NCBhdCAxMjoxMzozOEFNICswODAwLCBOaWNrIEh1IHdyb3RlOgo+PiA+SGkgRGVlcGFrCj4+ID4K 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