From nobody Wed Nov 27 19:38:55 2024 Received: from mail-pf1-f169.google.com (mail-pf1-f169.google.com [209.85.210.169]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 29F14215F50 for ; Tue, 8 Oct 2024 22:37:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.169 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728427074; cv=none; b=ZpixFtRmtpDgytJIYibkHvC44+pZj2cmlFwgSYTF//BS2XVjvHxWB4+56K5SsEjsrKU7BCiu7sLzfGXkZsvmVMdAEGjD6Az3pCrvwr+ddtt4Hl6XzAnl7fwyYrqIO72IE8kMpm1FsPL7htIfmFvmekaup1xoQPxHZ9yVOgpsC3A= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728427074; c=relaxed/simple; bh=zXJMeVCU0/xR62pDJCipOAYdaSp2CdjUA0XW8sGT2qU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ncIma70lhA7kdHoWJ7/7mzJbUsAuB+zcUdGtM/aDtglPeXOOrkNG8GpME9AuEVFh5yhEnQA3OzlGN3c/fhCm2lcqKxU3eldGeehsN0DVLXhehuxvCjcqoWGkHDcZE34eOZE+fyBuE3rfp9zBXUQw56/VZsnuyvqjcIlKEffysPk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com; spf=pass smtp.mailfrom=rivosinc.com; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b=1iFoS2IK; arc=none smtp.client-ip=209.85.210.169 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rivosinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b="1iFoS2IK" Received: by mail-pf1-f169.google.com with SMTP id d2e1a72fcca58-71df2de4ed4so209280b3a.0 for ; Tue, 08 Oct 2024 15:37:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1728427072; x=1729031872; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=OwXMBbOWCv06xRC7kuAtikxfL3CuNBKfrSTtPkKqEqk=; b=1iFoS2IKDK81u+aY5ToliWmDLYvXSb2gqeFKQedOlf4T43fZ/66zyVp4S/zTZNyw66 oTUPG4W+ivNE+SwjYpSGIvv8aAXt5AvINbtZG3sG1bLUDyofcgkNeBGhfAn0/69zRiDA QJgUEVXOtgnDUiT+D6HJBX046vh9M49RZ58VOiSUJ8vmNq4euviwGJ1Ms01M/AjMM9SJ Rd7Inv4CnEYaLRBO/tEmP1rYacDygUQbiLqHH0RPlGnNZC/z4FrnSbkd+oZ7yhwGd2Nb qUpDjIOdB4QDsRBdT2mC1k5oZFdykEl9u5uYP8IO/vqzJ12DXq7eeMIE5nF+0TICHHZU g3KQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1728427072; x=1729031872; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=OwXMBbOWCv06xRC7kuAtikxfL3CuNBKfrSTtPkKqEqk=; b=iPlTvrp3aaR3q8tQanix37hAD1XtgHdrcJL1QwEIf9WyaiMDVfg6i5/w93U8KPFtAa npnZX+xrc+qJcRyUcJc/PCS+HeJj4N99hiMAGRo2ub/5YOrrt6GIejAdH1HbKnb8vHuj mGl+W4Q2/8y828HR/w/YNTJ4D7gSnOgdMEGUWdzNAjQalJoQKgBDBG3hLaGPfOstlEK4 cEA1IAyHY3+h9d0l47G7yfhPurCg2ht7Vi5rl/g88blNusyGb6u1BWQuyg1p6LI6Cz4q w3TBVM5zidRU5Kw1Nd9HOcYm+qxm98kjfp+RveUwa7+cHx6PKn4J4yIyRLrGkG6ZzV0s znog== X-Gm-Message-State: AOJu0YyPO9x0fhk0YljcarvQc2e49POzTR8exuXWxq87pOag0ggxe8d+ AziWUIxPOm6D/nBa/PMlqlpasEtCUYabESd4RPVB0cfPqK0nQMeIpm/SkoD4hmw= X-Google-Smtp-Source: AGHT+IE674Tlfxux7he+iKObmN4Z/Vy2GyXvFfvVMkaZszYDuFORWLn02mu8lREUGmUPEtmKzi9hiA== X-Received: by 2002:a05:6a00:c94:b0:71d:f2e1:f02b with SMTP id d2e1a72fcca58-71e1048dfadmr8990425b3a.2.1728427072537; Tue, 08 Oct 2024 15:37:52 -0700 (PDT) Received: from debug.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71df0ccc4b2sm6591270b3a.45.2024.10.08.15.37.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Oct 2024 15:37:52 -0700 (PDT) From: Deepak Gupta Date: Tue, 08 Oct 2024 15:36:44 -0700 Subject: [PATCH v6 02/33] mm: helper `is_shadow_stack_vma` to check shadow stack vma Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241008-v5_user_cfi_series-v6-2-60d9fe073f37@rivosinc.com> References: <20241008-v5_user_cfi_series-v6-0-60d9fe073f37@rivosinc.com> In-Reply-To: <20241008-v5_user_cfi_series-v6-0-60d9fe073f37@rivosinc.com> To: 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 Cc: 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, Deepak Gupta X-Mailer: b4 0.14.0 VM_SHADOW_STACK (alias to VM_HIGH_ARCH_5) is used to encode shadow stack VMA on three architectures (x86 shadow stack, arm GCS and RISC-V shadow stack). In case architecture doesn't implement shadow stack, it's VM_NONE Introducing a helper `is_shadow_stack_vma` to determine shadow stack vma or not. Signed-off-by: Deepak Gupta --- mm/gup.c | 2 +- mm/vma.h | 10 +++++++--- 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/mm/gup.c b/mm/gup.c index a82890b46a36..8e6e14179f6c 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -1282,7 +1282,7 @@ static int check_vma_flags(struct vm_area_struct *vma= , unsigned long gup_flags) !writable_file_mapping_allowed(vma, gup_flags)) return -EFAULT; =20 - if (!(vm_flags & VM_WRITE) || (vm_flags & VM_SHADOW_STACK)) { + if (!(vm_flags & VM_WRITE) || is_shadow_stack_vma(vm_flags)) { if (!(gup_flags & FOLL_FORCE)) return -EFAULT; /* hugetlb does not support FOLL_FORCE|FOLL_WRITE. */ diff --git a/mm/vma.h b/mm/vma.h index 819f994cf727..0f238dc37231 100644 --- a/mm/vma.h +++ b/mm/vma.h @@ -357,7 +357,7 @@ static inline struct vm_area_struct *vma_prev_limit(str= uct vma_iterator *vmi, } =20 /* - * These three helpers classifies VMAs for virtual memory accounting. + * These four helpers classifies VMAs for virtual memory accounting. */ =20 /* @@ -368,6 +368,11 @@ static inline bool is_exec_mapping(vm_flags_t flags) return (flags & (VM_EXEC | VM_WRITE | VM_STACK)) =3D=3D VM_EXEC; } =20 +static inline bool is_shadow_stack_vma(vm_flags_t vm_flags) +{ + return !!(vm_flags & VM_SHADOW_STACK); +} + /* * Stack area (including shadow stacks) * @@ -376,7 +381,7 @@ static inline bool is_exec_mapping(vm_flags_t flags) */ static inline bool is_stack_mapping(vm_flags_t flags) { - return ((flags & VM_STACK) =3D=3D VM_STACK) || (flags & VM_SHADOW_STACK); + return ((flags & VM_STACK) =3D=3D VM_STACK) || is_shadow_stack_vma(flags); } =20 /* @@ -387,7 +392,6 @@ static inline bool is_data_mapping(vm_flags_t flags) return (flags & (VM_WRITE | VM_SHARED | VM_STACK)) =3D=3D VM_WRITE; } =20 - static inline void vma_iter_config(struct vma_iterator *vmi, unsigned long index, unsigned long last) { --=20 2.45.0