From patchwork Wed Nov 22 09:42:13 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13464437 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 C7CEDC61DA7 for ; Wed, 22 Nov 2023 09:43:44 +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=nNk9cZNx0Ed+ywz16aMtVeDFvY3c2S7ue/11WHVdP94=; b=fbEgI/BNjDbje5 0WWcaiGnBYMPqcL4qkBrepYiMSRzr7/QP3Iw5gLOHJeQuYxWw0Om9UUxaIT/NT5qQ3ryFyGe2ZFt3 FgjiKQiyfNXjZaB2R+hwI9byUc7vVWtDcByuArazujUg08+55q7VAbg0Nf38B5x/a/Po2bn8oK5Y8 pB2TUMgB4CGZytHl11E06YVlOyg/AEnjCvJ4GIbpQbdmBkOsBPIYMQV7gN4fDAr5hfXO4qKZ0LdNK tQb1AVZzxveMEeKAHWgub+/x65rvBp/ac54x3bj68XHhPZqaIdgNfjL+60CybdFW+Eat4BCDgyTX0 GcLkBHfjIl+ZI2CMJRbg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1r5jlQ-001FGZ-2V; Wed, 22 Nov 2023 09:43:20 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1r5jlN-001FD2-21; Wed, 22 Nov 2023 09:43:19 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by ams.source.kernel.org (Postfix) with ESMTP id 999C5B8117B; Wed, 22 Nov 2023 09:43:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BB115C433C7; Wed, 22 Nov 2023 09:43:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700646195; bh=EkyJ2sjNqguwXqxmxIIfJqgpolmeU80tDQ1mr2D5TfQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=VS4V1mmE0ZeLoutxYILjpbDNn60e5Tw0OcoSbTasgmO/VejZ//vSk5A4xO+WKFwqr Vt+kO1vC6TXvQBTVbFHHuAp1E9yemr98c7HwHxCb8pBTuq2ba5qEzAzV28dH5jUvlU zMV7HFvQUN1V1bnbNkCq15iyICNQRqCvaWVMvZx4cPo7LnC/W6QUANmM/9t8FXhwrZ eQ+p2PRpxpv2DgKFpKGxSozrGbwpYTwkR7GsL9szoTE6zP6Poc7ZZozJj+u3Frk+Ot uAG2FJIIdF6HfISncjYll7FQ2wapnt8Bc+ndxxZBDEI5t7GlqrUHlXf3Jwmo1mtA3k w60pzdRod63Lw== From: Mark Brown Date: Wed, 22 Nov 2023 09:42:13 +0000 Subject: [PATCH v7 03/39] mman: Add map_shadow_stack() flags MIME-Version: 1.0 Message-Id: <20231122-arm64-gcs-v7-3-201c483bd775@kernel.org> References: <20231122-arm64-gcs-v7-0-201c483bd775@kernel.org> In-Reply-To: <20231122-arm64-gcs-v7-0-201c483bd775@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-0438c X-Developer-Signature: v=1; a=openpgp-sha256; l=1759; i=broonie@kernel.org; h=from:subject:message-id; bh=EkyJ2sjNqguwXqxmxIIfJqgpolmeU80tDQ1mr2D5TfQ=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBlXcz5ctjongA13l+3s8rDr6lCcYzCiV/EZ+w01 Sjq0p1+agmJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZV3M+QAKCRAk1otyXVSH 0BmeB/0fdILWv3xnmoh3iIUnb+EGSP88bn3NvTdnqSR6EOCHL4XrJPUgwQteJL4EkrLBwM7IXDO phEWSI0/nmWusNr3v9UW6kZ1NmYF+253MWc4v54TjgzG9k4mafDzYYfcZzuGeMZK6JCCAWkGLr0 wv9DrCEa/2jyyNb5n2y+K8nYdNHuJuRrS+1Upl0ZSZ1w9M1JxGUsJgLvnPmoIDgcox7Wg6uxeHf BzbRTK0693utYKeBvr3gTPU/c80PO0X47jTSfpB+WRA2FLQW9FCrDBwc3Z6WFvN2+z7guWL/86q nFREV+64zb5OuzopYwcn7fjb3cADnfSnvSBqlAmHmHfk5T6+ 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-20231122_014317_960035_5036367F X-CRM114-Status: GOOD ( 13.34 ) 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 */