From patchwork Sat Feb 3 12:25:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13544066 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 6CC33C4828F for ; Sat, 3 Feb 2024 12:28:04 +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-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References:Message-Id :MIME-Version:Subject:Date:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=y8GmwRJeGk5apFQzLfIQXQMJrzx1kfzdlDlBe1DIIXY=; b=iIUQUWlF0hobtz uKhAyh8+ShXuVLaZh7zcp6LOpjLuao3o1V38o8z1fphjBLyvpPEJdFjOMa3QbShJxoo7E7Nh0x/Pc iP4I12j+N/4UgGc+wAM24K+ApRoA0o5Rn7OsPKi9ZiN43rS/5gVb0oGnmeOsb3opPD+hu0VAgcHVD ZBmcX38yuMVWoeRPkV0cqmFfZBRdX3CUutxAtntkAAk4JrYVbBS8NDHEYfG7aYwI6cXUKt37EA8on f1CreLh7EeCrIbv7EkoHEn8c7VjpxtmC3qRAj6q1ZpsnCC1jY4afBq34jbjV2VNxdoPCRcQBeFRrr +wRCFNgV0dc8NL+Cs+ZA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rWF7h-0000000GHfj-08J7; Sat, 03 Feb 2024 12:27:53 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rWF7e-0000000GHe0-18e0; Sat, 03 Feb 2024 12:27:52 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id A28A860A13; Sat, 3 Feb 2024 12:27:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 76937C433F1; Sat, 3 Feb 2024 12:27:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1706963269; bh=uElqfQr2KtEKDlB4Anquq4cFfJfq+1aLsyIKGyzwTJE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=s313WgbkOz6vbnCBve0R1yHwDF1pK5mK+UYPA+OD99GziD3jcKqQKnySBTBGi4duj vqr/SmLkHLF4Lk3ruhNzm4cJmmH3yq67ODVpGPJa204lWf5JGzspt5wcs+jVeTqQ3S xhGc67JCzmdfCFdtsQj0eD1MNq802vjS85i8oJ77UsbyUsgJU3LC/razYzQhP82fOZ yUEt8OsHLWgjE5yCQS9U678Dqz4m0U/3+3XD3cpVQmlStDup2yznD4F1i3uy552aa2 ph8TrgcsHHnR/DdeZgxHiKuE4/CWD9hXMRVY4GM5fwosCA8s0HuS3SOZeZGavv+/d9 AJIcyVewnHvvA== From: Mark Brown Date: Sat, 03 Feb 2024 12:25:29 +0000 Subject: [PATCH v8 03/38] mman: Add map_shadow_stack() flags MIME-Version: 1.0 Message-Id: <20240203-arm64-gcs-v8-3-c9fec77673ef@kernel.org> References: <20240203-arm64-gcs-v8-0-c9fec77673ef@kernel.org> In-Reply-To: <20240203-arm64-gcs-v8-0-c9fec77673ef@kernel.org> To: Catalin Marinas , Will Deacon , Jonathan Corbet , Andrew Morton , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Arnd Bergmann , Oleg Nesterov , Eric Biederman , Kees Cook , Shuah Khan , "Rick P. Edgecombe" , Deepak Gupta , Ard Biesheuvel , Szabolcs Nagy Cc: "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Florian Weimer , Christian Brauner , Thiago Jung Bauermann , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Mark Brown X-Mailer: b4 0.13-dev-a684c X-Developer-Signature: v=1; a=openpgp-sha256; l=1759; i=broonie@kernel.org; h=from:subject:message-id; bh=uElqfQr2KtEKDlB4Anquq4cFfJfq+1aLsyIKGyzwTJE=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBlvjDTUIBdLAQcWP64eMtOa1tBhyxd3vT1/dabcKsI J03ruPGJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZb4w0wAKCRAk1otyXVSH0H1sB/ 48Yjm/fTfaRFnrNWPL9rLUxz1LhV7ouhYI4uPWpceW/ximquDLxZHEc/zFA3kWQprsk3kgF3Ek+H4h sJ6pKh0M9pJjZAaoKYLHUs725T3HFZXBH+EY+nMbrwxH0LDhcfEZLPfhdYFuRJJf43IjfuPzYjQF44 RFh4W9ZcVujZWePceJLCoClhHmUjxLuT2mjx+h0DBhjLu7LU6hT0wiXmkntjXRiS99AUMr2o7qNyms aaPTUAlLc0njj8DVRSzXsIP/EhochXn1l2v8kaUwkKB6RZSxGLBAWOqK9emNUOuONlL5xtKPyqXGqA OIJpJdP//0DLv8SNxwE5R86ch2Uq66 X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240203_042750_485055_48285667 X-CRM114-Status: GOOD ( 12.89 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org In preparation for adding arm64 GCS support make the map_shadow_stack() SHADOW_STACK_SET_TOKEN flag generic and add _SET_MARKER. The existing flag indicats that a token usable for stack switch should be added to the top of the newly mapped GCS region while the new flag indicates that a top of stack marker suitable for use by unwinders should be added above that. For arm64 the top of stack marker is all bits 0. Signed-off-by: Mark Brown --- arch/x86/include/uapi/asm/mman.h | 3 --- include/uapi/asm-generic/mman.h | 4 ++++ 2 files changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/x86/include/uapi/asm/mman.h b/arch/x86/include/uapi/asm/mman.h index 46cdc941f958..ac1e6277212b 100644 --- a/arch/x86/include/uapi/asm/mman.h +++ b/arch/x86/include/uapi/asm/mman.h @@ -5,9 +5,6 @@ #define MAP_32BIT 0x40 /* only give out 32bit addresses */ #define MAP_ABOVE4G 0x80 /* only map above 4GB */ -/* Flags for map_shadow_stack(2) */ -#define SHADOW_STACK_SET_TOKEN (1ULL << 0) /* Set up a restore token in the shadow stack */ - #include #endif /* _ASM_X86_MMAN_H */ diff --git a/include/uapi/asm-generic/mman.h b/include/uapi/asm-generic/mman.h index 57e8195d0b53..d6a282687af5 100644 --- a/include/uapi/asm-generic/mman.h +++ b/include/uapi/asm-generic/mman.h @@ -19,4 +19,8 @@ #define MCL_FUTURE 2 /* lock all future mappings */ #define MCL_ONFAULT 4 /* lock all pages that are faulted in */ +#define SHADOW_STACK_SET_TOKEN (1ULL << 0) /* Set up a restore token in the shadow stack */ +#define SHADOW_STACK_SET_MARKER (1ULL << 1) /* Set up a top of stack merker in the shadow stack */ + + #endif /* __ASM_GENERIC_MMAN_H */