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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 42EDAC87FDA for ; Fri, 8 Aug 2025 17:20:26 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id D7F416B009D; Fri, 8 Aug 2025 13:20:25 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D570B6B009E; Fri, 8 Aug 2025 13:20:25 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C6CF16B009F; Fri, 8 Aug 2025 13:20:25 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id B666C6B009D for ; Fri, 8 Aug 2025 13:20:25 -0400 (EDT) Received: from smtpin21.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 5D620115C9F for ; Fri, 8 Aug 2025 17:20:25 +0000 (UTC) X-FDA: 83754254010.21.F78FB41 Received: from mail-pf1-f181.google.com (mail-pf1-f181.google.com [209.85.210.181]) by imf12.hostedemail.com (Postfix) with ESMTP id 9A87F4000A for ; Fri, 8 Aug 2025 17:20:23 +0000 (UTC) Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=rivosinc.com header.s=google header.b=Pt7orO2+; dmarc=none; spf=pass (imf12.hostedemail.com: domain of debug@rivosinc.com designates 209.85.210.181 as permitted sender) smtp.mailfrom=debug@rivosinc.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1754673623; a=rsa-sha256; cv=none; b=1X/Q9pxqHmv4XtzTBnkk/s1U1PtA7dD1T01p/AYV6/28Vs9NEiOd10+wMuselrnY2MGHEt Du5gK2PPmkpjkusBL5de2CjrTaaEBud/oqfIAqbmKmtM7J7U8NCDRPtspSMk9nTC+JTke3 N/0nEtVe2q07iZNENfV9iCRfpX1PU4o= ARC-Authentication-Results: i=1; imf12.hostedemail.com; dkim=pass header.d=rivosinc.com header.s=google header.b=Pt7orO2+; dmarc=none; spf=pass (imf12.hostedemail.com: domain of debug@rivosinc.com designates 209.85.210.181 as permitted sender) smtp.mailfrom=debug@rivosinc.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1754673623; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=e5KtmNZscqY46KvhQCHs24ev6RrXWd+1XTPfyk6qu6o=; b=igoLMbsMrZqGrf3f5xCLPMiRQaawc85ADxbXQo2eRvR7kuA5MUZViuCd9xDuI0LtV/JR/H cfXn/JTl4JM58lemjtUyRXkP937fSlF7jKfTGUD32gMLxZElM4s7jYjCxQil5Zv06sceGM SEX+SmljvUuhebGzIe8cezILSxiyWrw= Received: by mail-pf1-f181.google.com with SMTP id d2e1a72fcca58-76bdce2ee10so2156998b3a.2 for ; Fri, 08 Aug 2025 10:20:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc.com; s=google; t=1754673622; x=1755278422; darn=kvack.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=e5KtmNZscqY46KvhQCHs24ev6RrXWd+1XTPfyk6qu6o=; b=Pt7orO2+DTz8LkdiHLIrruqQ2kZuvgSnK0Z8T35dlrUYm5jq1AJ8vBhxT++FMI3dEz u+TY0FRO8+3pfrAkEoVu592gl6fhctdGUc3vUBn71J4kGDnHDNJ1WcBeLMOOg+QovRGz SFs8bsYakON7mzjnTJ5GOYXtTy49OqgPlOvbEgpzxD9x/DgX9853s5hfDLk5tyLrffcX kdhRItJJn3jE+euVuchBtzolAt/ud6zHxbW5M6csdHCzv2gSr5nyK3IU6rJ4HASGVEmP P89Z31qnb/ya+cZX6i3X2PLCzl/JbJoHoHX74dMkCcXRpCjThsDCKG8Bk+QU9NxnNC// Gklg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754673622; x=1755278422; h=in-reply-to: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=e5KtmNZscqY46KvhQCHs24ev6RrXWd+1XTPfyk6qu6o=; b=xU9HBiCFHQzZFWVJrwXPfQM/t5wQLaQ+jAToZ8MR9LPrwMhMwSl3x3utMKyRmYCMZl DDuOm5mHQYHN04y0PF6Q2fBwR+FWKG1PZoYoIx1S7YtqBIslGwTk2QzhiVM93wBF7qOl hqD4iw7GhZXjXBw4gIeb88aXpEhpV5XMbx1qKt0KJcR3ABYDUvtULLqsArZznBZIoJ8w eCNHpKJSD4MPr4+HWBTmEVmg3UzkbdzUV+WgVkoMmPiG4O8JFCmJyl6OGtET0scc5Mq3 YLbKlDJ06bWzJwFKJGWxHT9A18Smk59y2/5OWAycMRnzRz8dZqfIZR05pg9PBYvfFf84 dlCg== X-Forwarded-Encrypted: i=1; AJvYcCXmS4Yu2ImqZ+T86saVWmUCtgixd8uC2gspiy3DKM/TpF5i+Xla+tzpFSjN802Q9P0jxlCWKClR3Q==@kvack.org X-Gm-Message-State: AOJu0YxqXeUlN2CSZB/c+pwVrPEWCCJsu4LusRrP8ga0zvMhmv6Y7PRa z4iT7okbCp6mMNeFhkj9GnUdwki9rFw4T5+SIJTXfm599GXjvph45hCPjO/qsdSum3s= X-Gm-Gg: ASbGncvu8AcEGndl0PSBwPTUJvZMBLm5UOI+MfY42mNZWrotFHJEE2BRYRQBWSszQmR gakUKP6TEP6O9uh+GSevFboCSu047JCYg/B0aDe363R6D0hDVL/aBY3eDF+Nvj0ZGx5nOMCj9YA bg93aCkIW/qCz3hP8bI749bLXTwNV5IVz5srpZxwOv8voquCw27MYtRf2oOoXGKj2tfWIig5X3b KfN0El8njFIez5mribyHHwZaXCAUuBTXMlTd5BXC1ksO2FTPs+1SFtdfa5CV8h06XTXPBKNLfB1 BzDbKBpgW+9+DqubnklOEY6hXJ32D0LQEpFy5i6iZRBUg/rwyx2xc4DtHmkEZ0/CoQZOwelO3Gp 5P7i/9GvsLHt+yhdleD+saJLrbSS93M/ZjDAb+xib6HA= X-Google-Smtp-Source: AGHT+IEbXOfCcMMF+EKLeMi8xU3SNI8Lg4qkWBu83GI5zB4sNqf//XXj2WJssysLa22zlDPxSEkl6g== X-Received: by 2002:a17:902:da82:b0:240:c678:c1ee with SMTP id d9443c01a7336-242c1ffb211mr57743355ad.11.1754673622272; Fri, 08 Aug 2025 10:20:22 -0700 (PDT) Received: from debug.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-241e8aafa77sm213263625ad.174.2025.08.08.10.20.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 08 Aug 2025 10:20:21 -0700 (PDT) Date: Fri, 8 Aug 2025 10:20:17 -0700 From: Deepak Gupta To: Mark Brown Cc: patchwork-bot+linux-riscv@kernel.org, linux-riscv@lists.infradead.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, akpm@linux-foundation.org, Liam.Howlett@oracle.com, vbabka@suse.cz, lorenzo.stoakes@oracle.com, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, conor@kernel.org, robh@kernel.org, krzk+dt@kernel.org, arnd@arndb.de, brauner@kernel.org, peterz@infradead.org, oleg@redhat.com, ebiederm@xmission.com, kees@kernel.org, corbet@lwn.net, shuah@kernel.org, jannh@google.com, conor+dt@kernel.org, ojeda@kernel.org, alex.gaynor@gmail.com, boqun.feng@gmail.com, gary@garyguo.net, bjorn3_gh@protonmail.com, a.hindborg@kernel.org, aliceryhl@google.com, tmgross@umich.edu, lossin@kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.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, rick.p.edgecombe@intel.com, rust-for-linux@vger.kernel.org, zong.li@sifive.com, david@redhat.com Subject: Re: [PATCH v19 00/27] riscv control-flow integrity for usermode Message-ID: References: <20250731-v5_user_cfi_series-v19-0-09b468d7beab@rivosinc.com> <175450053775.2863135.11568399057706626223.git-patchwork-notify@kernel.org> <09081487-89ac-4f8d-b9fc-e563f09726d2@sirena.org.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <09081487-89ac-4f8d-b9fc-e563f09726d2@sirena.org.uk> X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 9A87F4000A X-Stat-Signature: tza1k9u9wd313a7mfxjczxjaf3fko9h9 X-Rspam-User: X-HE-Tag: 1754673623-355228 X-HE-Meta: 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 R2KL6Ph4 GlXI92WldCdM594kgGoHmi6YOjBM/mVn2g6MyJUL7IQ3D0sMrA4qbPJAyF5hkW9ve8DFvzQkLXPebAjdZpBptfrrnCK9uSEjoK3LL 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: List-Subscribe: List-Unsubscribe: On Fri, Aug 08, 2025 at 12:48:31PM +0100, Mark Brown wrote: >On Fri, Aug 08, 2025 at 01:23:15AM -0700, Deepak Gupta wrote: >> On Thu, Aug 07, 2025 at 01:28:36PM +0100, Mark Brown wrote: > >> > Do you have an update for my clone3() shadow > >> No I don't. > >> > stack series that I could roll in for when I repost that after the merge >> > window, and/or instructions for how to run this stuff for RISC-V on some >> > emulated platform? > >> I would want to write-up instructions. But I don't want you to go through >> a lot of hassle of building toolchain and bunch of other stuff. >> Let me see how I can make it easy for you. Will report back. > >Thanks. FWIW I should already be sorted for the kernel build, unless >there's a super new or specialist toolchain required for this feature Unlike x86 shadow stack and arm's GCS, push on RISC-V shadow stack is done using dedicated `sspush` instruction and pop is done using instruction `sspopchk`. RISC-V vDSO has certain `C` files and they would need shadow stack push and pop (along with landing pad on them). So that's why kernel compile would require the toolchain. I'll point you to it. >(I'd guess I should be fine for the shadow stacks bit?) - it's userspace >and emulation for the extension I'm missing. Qemu changes are upstream. I'll provide the command line option. On userspace, I'll point you to something pre-compiled rootfs.