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 2735ECA0EE6 for ; Fri, 15 Aug 2025 09:00:20 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id BCB31900226; Fri, 15 Aug 2025 05:00:19 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B7B2D8E0002; Fri, 15 Aug 2025 05:00:19 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A6A3D900226; Fri, 15 Aug 2025 05:00:19 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 93D898E0002 for ; Fri, 15 Aug 2025 05:00:19 -0400 (EDT) Received: from smtpin26.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 5D6A51408CA for ; Fri, 15 Aug 2025 09:00:19 +0000 (UTC) X-FDA: 83778395358.26.D852F2C Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf22.hostedemail.com (Postfix) with ESMTP id C0F5FC000F for ; Fri, 15 Aug 2025 09:00:17 +0000 (UTC) Authentication-Results: imf22.hostedemail.com; dkim=none; spf=pass (imf22.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1755248417; 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-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=WWMyLJjFwfDhUGhjD3NSb7U3rCUdr5sjqOjLOhtLe2M=; b=8hxBZNOBYQl396SpOWHliTfdZnKstumz/SBIMjCbnpPo4sFT2L9RkSSXLUH/3qs/Rm+zfv IZnKjI7zMlpUUXb/CqBpaRzyITYy8BuFQwRxs1kNVweR5fsdRha6uMBAFDuCTOPLrOvEgD bRz8RWimL3PTEdwoN5JujsTxQxpkbNM= ARC-Authentication-Results: i=1; imf22.hostedemail.com; dkim=none; spf=pass (imf22.hostedemail.com: domain of kevin.brodsky@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=kevin.brodsky@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1755248417; a=rsa-sha256; cv=none; b=lW10iA6n8DByuAa863Jr9fytVKot49/HlISxM4ZFiQ9mC0EgH021BemSzrOWSKKeh3I8g7 NKYmOi512Yyi777CCESTU1zQ4DN/5xaTh4ZU7qHFxX3aChSLOSGdDy+loz2ZhV1cXcOOh9 xb84cOytYfv9Da+39iO6a9+5WIdzHc4= Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id C51341E5E; Fri, 15 Aug 2025 02:00:08 -0700 (PDT) Received: from e123572-lin.arm.com (e123572-lin.cambridge.arm.com [10.1.194.54]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 8EE173F63F; Fri, 15 Aug 2025 02:00:12 -0700 (PDT) From: Kevin Brodsky To: linux-hardening@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Kevin Brodsky , Andrew Morton , Andy Lutomirski , Catalin Marinas , Dave Hansen , David Howells , "Eric W. Biederman" , Jann Horn , Jeff Xu , Joey Gouly , Kees Cook , Linus Walleij , Lorenzo Stoakes , Marc Zyngier , Mark Brown , Matthew Wilcox , Maxwell Bland , "Mike Rapoport (IBM)" , Peter Zijlstra , Pierre Langlois , Quentin Perret , Ryan Roberts , Thomas Gleixner , Vlastimil Babka , Will Deacon , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, x86@kernel.org Subject: [RFC PATCH v2 2/8] mm: kpkeys: Introduce unrestricted level Date: Fri, 15 Aug 2025 09:59:54 +0100 Message-ID: <20250815090000.2182450-3-kevin.brodsky@arm.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20250815090000.2182450-1-kevin.brodsky@arm.com> References: <20250815090000.2182450-1-kevin.brodsky@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: C0F5FC000F X-Stat-Signature: 7nqasikmqzcrzyyiss3buqgxwugn9pxh X-Rspam-User: X-HE-Tag: 1755248417-224225 X-HE-Meta: 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 IW16UN33 Vwx/ihe58hObpcRj+81jL+SrjVUEKWNLKENDKInd9kCZ/2BxMXMunhpzXwV4ojZEEcxVeUOTdxRFj509KguCrsdU92gPUttHl0zqB3XIYaU0AHnivh+AdvacAF45oZeOWRW/g0GqTQEmQwjhmV+2tzO50Tg== 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: Highly privileged components, such as allocators, may require write access to arbitrary data. To that end, introduce a kpkeys level that grants write access to all kpkeys. Signed-off-by: Kevin Brodsky --- arch/arm64/include/asm/kpkeys.h | 4 +++- include/linux/kpkeys.h | 3 ++- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/arm64/include/asm/kpkeys.h b/arch/arm64/include/asm/kpkeys.h index 70e21df84252..ded5d6e988dc 100644 --- a/arch/arm64/include/asm/kpkeys.h +++ b/arch/arm64/include/asm/kpkeys.h @@ -28,7 +28,9 @@ static inline u64 por_set_kpkeys_level(u64 por, int level) { por = por_elx_set_pkey_perms(por, KPKEYS_PKEY_DEFAULT, POE_RWX); por = por_elx_set_pkey_perms(por, KPKEYS_PKEY_PGTABLES, - level == KPKEYS_LVL_PGTABLES ? POE_RW : POE_R); + level == KPKEYS_LVL_PGTABLES || + level == KPKEYS_LVL_UNRESTRICTED + ? POE_RW : POE_R); return por; } diff --git a/include/linux/kpkeys.h b/include/linux/kpkeys.h index 5f4b096374ba..48f240bea8e1 100644 --- a/include/linux/kpkeys.h +++ b/include/linux/kpkeys.h @@ -10,9 +10,10 @@ struct folio; #define KPKEYS_LVL_DEFAULT 0 #define KPKEYS_LVL_PGTABLES 1 +#define KPKEYS_LVL_UNRESTRICTED 2 #define KPKEYS_LVL_MIN KPKEYS_LVL_DEFAULT -#define KPKEYS_LVL_MAX KPKEYS_LVL_PGTABLES +#define KPKEYS_LVL_MAX KPKEYS_LVL_UNRESTRICTED #define __KPKEYS_GUARD(name, set_level, restore_pkey_reg, set_arg, ...) \ __DEFINE_CLASS_IS_CONDITIONAL(name, false); \ -- 2.47.0