From patchwork Thu Aug 22 01:15:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13772294 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 28521134A8; Thu, 22 Aug 2024 01:16:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724289373; cv=none; b=HIzvHubdRt7p8rnJPGaMqoK3y6iydb2NhoCA0AWOjf3/u3+9e6ayxKif+y2/vLAcsaQftkdgYkyig8nqtLTQQF64DDEYkhmXncEZOa20d/GfknDEct7b+1s2MpNsuM2+kzuegZOYgejsPxTBnNZUDLrXXvJzlkY0DCuS332HLng= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724289373; c=relaxed/simple; bh=aXGeSW3grtLdSnTdx5+gSzbAczg0duMe8mDGJOGSfWQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=A3BYNuh0FD5RJiKiXQI1W+nANftgRu7A3nJunCq7V4pv6rGJALzB9ErwJ7UcxJKKYDd1JaGH60b1abtyeMwbASleqW4mV15R/LIRV0nAyjQ44eQiAzDNkkvaWN/nKAFAdQHLt6nx7Uf4hSPZNocoleyqAeq1BikgXCdVsDNgAbU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=biXWX8Vm; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="biXWX8Vm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1E568C4AF0E; Thu, 22 Aug 2024 01:16:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724289372; bh=aXGeSW3grtLdSnTdx5+gSzbAczg0duMe8mDGJOGSfWQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=biXWX8Vmk/JOEerWjDB74EBnxWrPoMhMtVTPsc2ex00mX3Z4WCLkak9FasSKXhtvB Cdt5EJvv4aDcPjTOAawQHHFe/z63sQ8CdjGvk+wYlTUnC6MkVNvJGX/iYIPsj1W2I6 TJfatKx11NUzQZwL/1bGaCwx3TswneR9v4SaF95YOG4s8cznuYv6vsLeshxrwoByHx luNNZfvHuyrW+0Z5Q4Hnr4j2WAfiPLrc8TG857PL/s/veslHmJA2UnmbYK27PxYtdc +HpqFlIFxEkK9rzy/SjB/KjVFUznD3lLHW88rr1NGLDV2n/elQf6LN7gnsFUpmqSe1 UBxqZua1NkrFA== From: Mark Brown Date: Thu, 22 Aug 2024 02:15:04 +0100 Subject: [PATCH v11 01/39] mm: Introduce ARCH_HAS_USER_SHADOW_STACK Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240822-arm64-gcs-v11-1-41b81947ecb5@kernel.org> References: <20240822-arm64-gcs-v11-0-41b81947ecb5@kernel.org> In-Reply-To: <20240822-arm64-gcs-v11-0-41b81947ecb5@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 , Shuah Khan , "Rick P. Edgecombe" , Deepak Gupta , Ard Biesheuvel , Szabolcs Nagy , Kees Cook Cc: "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Florian Weimer , Christian Brauner , Thiago Jung Bauermann , Ross Burton , Yury Khrustalev , Wilco Dijkstra , 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 , David Hildenbrand , "Mike Rapoport (IBM)" , Kees Cook , Shuah Khan X-Mailer: b4 0.15-dev-37811 X-Developer-Signature: v=1; a=openpgp-sha256; l=2693; i=broonie@kernel.org; h=from:subject:message-id; bh=aXGeSW3grtLdSnTdx5+gSzbAczg0duMe8mDGJOGSfWQ=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmxpEkLhJIQbUOFiiEto8Mgop3OIshQ8p27HPLildg xhM8QJmJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZsaRJAAKCRAk1otyXVSH0GjtB/ 9JsDwl0HJhR1EO6wLHU8IcpvE5PJh892zoiYHI0bPT3Bqx28uTpDmZgrddnfXDarHeczPXMd4IzEA9 f9MX3Rkf6ODFlmACfOskT6PjN46ZBEDacxl4/smys5l/OdwpESjek5/CKD3p+viOUmeZ2uzzWQk8BD q1ElW83iGLq0MJokj0H/TrrJLg0+YkeeFCI3luZhQ/3IgYVYsn/pKcfKFMANnnfujKqAbTgR5dXsiw e+MSvPJLkhTHKnJKTNkQ8wyJlIjd3vyfzF+JyU6q0Eq59YN8GJ6TIpmvaDbmt4OqCKaiIYX6QVSjzt atiZSvCiUkNgacnNllTEUuU71/HB5v X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Since multiple architectures have support for shadow stacks and we need to select support for this feature in several places in the generic code provide a generic config option that the architectures can select. Suggested-by: David Hildenbrand Acked-by: David Hildenbrand Reviewed-by: Deepak Gupta Reviewed-by: Rick Edgecombe Reviewed-by: Mike Rapoport (IBM) Reviewed-by: Catalin Marinas Reviewed-by: Kees Cook Tested-by: Kees Cook Acked-by: Shuah Khan Signed-off-by: Mark Brown --- arch/x86/Kconfig | 1 + fs/proc/task_mmu.c | 2 +- include/linux/mm.h | 2 +- mm/Kconfig | 6 ++++++ 4 files changed, 9 insertions(+), 2 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 007bab9f2a0e..320e1f411163 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1957,6 +1957,7 @@ config X86_USER_SHADOW_STACK depends on AS_WRUSS depends on X86_64 select ARCH_USES_HIGH_VMA_FLAGS + select ARCH_HAS_USER_SHADOW_STACK select X86_CET help Shadow stack protection is a hardware feature that detects function diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 5f171ad7b436..0ea49725f524 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -984,7 +984,7 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR [ilog2(VM_UFFD_MINOR)] = "ui", #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */ -#ifdef CONFIG_X86_USER_SHADOW_STACK +#ifdef CONFIG_ARCH_HAS_USER_SHADOW_STACK [ilog2(VM_SHADOW_STACK)] = "ss", #endif #ifdef CONFIG_64BIT diff --git a/include/linux/mm.h b/include/linux/mm.h index c4b238a20b76..3357625c1db3 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -342,7 +342,7 @@ extern unsigned int kobjsize(const void *objp); #endif #endif /* CONFIG_ARCH_HAS_PKEYS */ -#ifdef CONFIG_X86_USER_SHADOW_STACK +#ifdef CONFIG_ARCH_HAS_USER_SHADOW_STACK /* * VM_SHADOW_STACK should not be set with VM_SHARED because of lack of * support core mm. diff --git a/mm/Kconfig b/mm/Kconfig index b72e7d040f78..3167be663bca 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -1263,6 +1263,12 @@ config IOMMU_MM_DATA config EXECMEM bool +config ARCH_HAS_USER_SHADOW_STACK + bool + help + The architecture has hardware support for userspace shadow call + stacks (eg, x86 CET, arm64 GCS or RISC-V Zicfiss). + source "mm/damon/Kconfig" endmenu