From nobody Thu Nov 28 13:45:17 2024 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 3BFEC19AD89; Tue, 1 Oct 2024 23:00:53 +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=1727823654; cv=none; b=MmWcn+PP37zjRkqSlQQ2flkncLWMO4ioFOeOCqDVH/LXUiETHZZbg2b38mJ09CzkFH+yuQiAl3wsldgL4JRYceygBojdNYz/KE1n58gCL4fvIU17QGmpmsjIrNM97E1nSqYR4ZUsiMinwqUjOBAuZ+YSy1D+zdKI7DIaIWafYy0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727823654; c=relaxed/simple; bh=vL+b/h3WOPYO7SwFl92JA9c0VbV77YwkdcIPJjlNFTs=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=ANbPldvrG5bbpLFI9vwZZ1hQZiKIyiC79x38vo7LORZyXFeQDq4CC+x6pfIaR6DDQRRdQFGS2ew+wb5C6zyht2b43krNARmR7NPfwz7P8jVuTE24GtTEShfY3PWdbaCwiPmCM0Y/Z6/Cl3ZtepadDs4v5u6cU4dIWpFDVYrPV4U= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Q9BEblIa; 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="Q9BEblIa" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 73BCEC4CECD; Tue, 1 Oct 2024 23:00:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1727823653; bh=vL+b/h3WOPYO7SwFl92JA9c0VbV77YwkdcIPJjlNFTs=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Q9BEblIa6MmA5Xaow7wFPzfAM9zttSOUnO+EtJzN/PX7Huf9lzr++3lNcVEnhbBqz 6dMkhlxPMElbdJeNlV158SBKPlOnHk5LQmhwlqFXihJgYSoqGxl3GLqUDM7DzAG5zc lvLDejujVe26CNwqEFjY9RC9WxGXrSNkF5G9RyuOCrURHXGYY7+8AA1BJ1SMrCIjZt BJvDkqRMfZF1cudVdwGq4CDhB5w9OLNa4NOrghTmOJJzwygsOzNNOFDRDlXzt7kKtH IpBNBwRkNrS1h0eaDjRqb0/mVRIcjwZiyqBZn+jatUlWQ0I77tCcOgDFflvH0cvLXI 3XrtVqCX11mdg== From: Mark Brown Date: Tue, 01 Oct 2024 23:58:44 +0100 Subject: [PATCH v13 05/40] mman: Add map_shadow_stack() flags Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241001-arm64-gcs-v13-5-222b78d87eee@kernel.org> References: <20241001-arm64-gcs-v13-0-222b78d87eee@kernel.org> In-Reply-To: <20241001-arm64-gcs-v13-0-222b78d87eee@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 , David Spickett , 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 X-Mailer: b4 0.15-dev-99b12 X-Developer-Signature: v=1; a=openpgp-sha256; l=1935; i=broonie@kernel.org; h=from:subject:message-id; bh=vL+b/h3WOPYO7SwFl92JA9c0VbV77YwkdcIPJjlNFTs=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBm/H7Ig3nICM+W9H3bCT71LrQPx0TmwN2XrzWIKusU qfRtVgmJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZvx+yAAKCRAk1otyXVSH0EIMB/ 9VAnLOcjD+99k7ouK69WkUZZje02S2hR6fRnCSftnhm+4bz+XAyRnRMAjPkiv0ecgHaTuBtP+MmN6L M1BTqr15gkX62ORCMeKqgMig0l5Zm08WyrOD4f/Vf4Zb4phDfeQkEhHthQYNAOzPiw9zjQIJGaypMM PJHFuO2ykfazrzqINBCj0D1SCeQt3+5cESSO4XqcDnyaOrpnKPqwWdoWVkNzB98GHx999EQw2iWsOp pEi9Zg8ZJFAhJSTayVv1NDY9QzD6ngW3nJCCx7rD/3cbiZd2/Whg25ERj0YbAqlldQVHJfqrX3RCBL guH+PVB5PQbczVYykW+F+llt/dznd7 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 indicates 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 Reviewed-by: Catalin Marinas Acked-by: Yury Khrustalev 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/m= man.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 */ =20 -/* Flags for map_shadow_stack(2) */ -#define SHADOW_STACK_SET_TOKEN (1ULL << 0) /* Set up a restore token in th= e shadow stack */ - #include =20 #endif /* _ASM_X86_MMAN_H */ diff --git a/include/uapi/asm-generic/mman.h b/include/uapi/asm-generic/mma= n.h index 57e8195d0b53..5e3d61ddbd8c 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 */ =20 +#define SHADOW_STACK_SET_TOKEN (1ULL << 0) /* Set up a restore token i= n the shadow stack */ +#define SHADOW_STACK_SET_MARKER (1ULL << 1) /* Set up a top of stack m= arker in the shadow stack */ + + #endif /* __ASM_GENERIC_MMAN_H */ --=20 2.39.2