From patchwork Thu Aug 1 12:06:30 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13750345 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 D666C1A01B7; Thu, 1 Aug 2024 12:57:40 +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=1722517061; cv=none; b=nSy4LkNfBWwFcbUztFzi4FrOI5fZT8Jt/QCKMUXwfYHTW0PmmdXMSEbGvRH2cFo0Ya58oIUO39UFDdxP03Xe4AhDxjEQ0y1O7pdfT5wfBez7hJ/cKSVaTAWrqaiGacrW4CysMuYhCebs9fgNeNkMh1dKohZXuEl1KSz6jLiloPU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722517061; c=relaxed/simple; bh=2jWl08+8re+Jbyu9WlYwMAOos2oJrw5SQjRGnUXuA4U=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=BaElBmpYwA6UTwEPh7aIbnLhqVib2QoiqNoBSTHf9xMANy3bd+g6+ma099toLsy0DdOLvUHJ0y8GFIpQIkob6hprWr4GoDynpbTsvIe/I+TnEYXPLfmN9Cj4apN8HCyslpgijVszrhE1VRi0rNxCjffzhIPeCcOnqrn3B+zL1PM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=k9EWh0gX; 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="k9EWh0gX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9EC12C32786; Thu, 1 Aug 2024 12:57:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1722517060; bh=2jWl08+8re+Jbyu9WlYwMAOos2oJrw5SQjRGnUXuA4U=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=k9EWh0gXg6rjx7kV1lB1Gmt38FbXgl6/I7ewuvHjZKZKsi0Ra/eNEDb4+nkaWeebY 5fo+KHzl2gVZT5y4QEi94AFCr3yy8q0Y3qfsKo4MUU8ZvEpLuaXTE+gJP1/QJAFy6b ZFESzXLHeTvuf0gbP+smJF5PdWb79uTbdLNbHoM7qIVEW52ay89XQq3Sh1JchzEOGn vJeZOlSSSY5GbPB2qtoVLFB9VX16JELscHgpRYVwyYdxXfoIRQv+2ArLna84PZ0pA/ DxpPvqcJ3zRpN1CX47iKOu5nvE+8eTswjAlK6Uc34hqiDr+Esbw3xgOrUR21qH2t9A 3O+OwqSvPl7qg== From: Mark Brown Date: Thu, 01 Aug 2024 13:06:30 +0100 Subject: [PATCH v10 03/40] mman: Add map_shadow_stack() flags Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240801-arm64-gcs-v10-3-699e2bd2190b@kernel.org> References: <20240801-arm64-gcs-v10-0-699e2bd2190b@kernel.org> In-Reply-To: <20240801-arm64-gcs-v10-0-699e2bd2190b@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 , 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 0.15-dev-37811 X-Developer-Signature: v=1; a=openpgp-sha256; l=1825; i=broonie@kernel.org; h=from:subject:message-id; bh=2jWl08+8re+Jbyu9WlYwMAOos2oJrw5SQjRGnUXuA4U=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmq4YID0+m+ZzdQpJGH0gtPDP+bAsXULUCyyq8/y2t MduEdEmJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZquGCAAKCRAk1otyXVSH0Ot1B/ 4jaebyV1tIrvOIYxQh5wDbypCmbpdfYnw84eR5kyJZqQIRjZ+dK0lQJngqeHe4n89q7hMI4OUDMfSr Otel0Z609ebmO09EfOX6sKZzZ2/uru4+YnSoeGjvRZZsYsr1B+7FWG3o5mVY91e4Sdd+6ukU+qHmzS axuQgqxevf/x3L67X0UZGMdmC5B8jQ2x6Gu99RAzuYELIUE2nPQ1wCneKnvlyC+FPrLbjWdkIDKVN8 wmGHe42BNZh62DU3scRZYxWf6RdwGbFcR9PlKRfpI7Ocuez5/KqBYFTD1YXpI3HGD35BhAYcpFTswG yKHazykP6dg1NzH0pTMC7LYphwlbfE X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB 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. Reviewed-by: Thiago Jung Bauermann Signed-off-by: Mark Brown Reviewed-by: Catalin Marinas --- 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 */