From patchwork Wed Jul 31 12:14:09 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13748598 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 009861B0139; Wed, 31 Jul 2024 12:19:22 +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=1722428363; cv=none; b=U4CFinKcxIWX8gZTWlK1diN8ZHs/qMKHkUzqEkcpME/XdJw8jo/R7tgiNGRnzvVHBDZy2KusuWA1F/Hj+v1NFhBizeS29JwA0QWU1+3YjBgoAdej/5n4H70Kv5a5RtgFyueip8Sxi2pCI7v3awFvDjaSs+QcTyNVkpylAWFyYPg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722428363; c=relaxed/simple; bh=+orwRfvizHfGXDNjTwUwjThxjP5rZLiehiVTLaa/d1s=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=qLB2V0nF8JRNLA22IIMRGyiYNIvxuLSLlAK1d+y504LPvb7SLHYr3At1aFY7gtNCi4+8xIT/gfTFNIwo83/4yIp5EDNYNVRF7f6QjGcd/u1C9EApFAv/crviTWeqZ5QkVNH2Fnxl1HpvO6uckvtVJrEiU/gxOtlLEr4aKZVzRrs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=bWOs+qlv; 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="bWOs+qlv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F1A27C4AF13; Wed, 31 Jul 2024 12:19:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1722428362; bh=+orwRfvizHfGXDNjTwUwjThxjP5rZLiehiVTLaa/d1s=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=bWOs+qlv4epwrENJqKaeWdap3YUIqdJACjgPkfeNIjyzZRd36GEAl5uaQNKXtW43F 2ezXPVtPp/7MRuJ9J7KdTRvaNuLnSg398DYW9CGY4N+h5ULtndjhwV0gIzM85xwDZh jueBKxZDxpao7NZgu4FPF+UqeHVg1EGAFG7nfDFYdkRTOzzFYIDYZxd0ERBBHpjDvX GHbBM7Ig8gWREsFGHB/pSQNiot+y0oQwqKlAgtwft/UuiRFVzUj4hWRHEsFFG3K/74 ss6D4S2HIcVVrqqNJLpqsOS6Lr8RuwAY2ThY65Xaw22zHGWfq8Miq24Go3JEN00wX6 JCaOjir12V6UA== From: Mark Brown Date: Wed, 31 Jul 2024 13:14:09 +0100 Subject: [PATCH RFT v7 3/9] mm: Introduce ARCH_HAS_USER_SHADOW_STACK Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240731-clone3-shadow-stack-v7-3-a9532eebfb1d@kernel.org> References: <20240731-clone3-shadow-stack-v7-0-a9532eebfb1d@kernel.org> In-Reply-To: <20240731-clone3-shadow-stack-v7-0-a9532eebfb1d@kernel.org> To: "Rick P. Edgecombe" , Deepak Gupta , Szabolcs Nagy , "H.J. Lu" , Florian Weimer , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider , Christian Brauner , Shuah Khan Cc: linux-kernel@vger.kernel.org, Catalin Marinas , Will Deacon , jannh@google.com, bsegall@google.com, linux-kselftest@vger.kernel.org, linux-api@vger.kernel.org, Mark Brown , Kees Cook , David Hildenbrand X-Mailer: b4 0.15-dev-37811 X-Developer-Signature: v=1; a=openpgp-sha256; l=2453; i=broonie@kernel.org; h=from:subject:message-id; bh=+orwRfvizHfGXDNjTwUwjThxjP5rZLiehiVTLaa/d1s=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmqiutmyS6KTfVaKVigjkcIuwaZLNIiG+JN6PPqQ/s xUOeyxaJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZqorrQAKCRAk1otyXVSH0Bm4CA CCun+l32pjSurBbTGV9CwVflFXomBm+PLhUX3xQqbnFO4r7Ri/kFkaynaqnhWQwUNPuZDbJKnfkvpJ e7ZdrZSa+pNCYjLQZ3SHMoN9q0dJ6L6yvjqaoEGXEY3x2xh+gW087xJDgfq5bczoUn9OMdbWsmofs8 QEWE9kqlYyejLuEfpF2DR9E4ZqJtZ+PAEr8l9ZkfVh8q+ObCJyCVC86HuVVTC2SqKP0U2yNBZeUpkU KzyJa+8qy6lCtw7XLKkRaAnRty3ofxk0nBUb5vzYlmrBuYzzPrIL3Zg4Sofktw5SdoQogisuy4OnzT 3Li1xi1aOx/lujfdw3JdUGzC5KwIyz 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 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