From mboxrd@z Thu Jan 1 00:00:00 1970 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4C17FC83F26 for ; Thu, 24 Jul 2025 05:50:41 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 0C16F8E0048; Thu, 24 Jul 2025 01:50:35 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 098268E004A; Thu, 24 Jul 2025 01:50:35 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EC9B38E0048; Thu, 24 Jul 2025 01:50:34 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id C05ED8E004A for ; Thu, 24 Jul 2025 01:50:34 -0400 (EDT) Received: from smtpin05.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 79B97583E1 for ; Thu, 24 Jul 2025 05:50:34 +0000 (UTC) X-FDA: 83698083588.05.8B67EC4 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf27.hostedemail.com (Postfix) with ESMTP id D10EF40005 for ; Thu, 24 Jul 2025 05:50:32 +0000 (UTC) Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=QgWgAc1Z; spf=pass (imf27.hostedemail.com: domain of kees@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=kees@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1753336232; a=rsa-sha256; cv=none; b=Rx9RbKcKzyIjC5jIxB7gh7RDboAhlzTsuq3pS7TF8GbR3aHiIhA/TjTPjX96Is36FVKLO/ uZNUdjE82Z/+ff6nXNKSOJ1wMEZhX6RjFUkdmVsAxzkTupu4PjmXcdi+YusP6jwpRh3RtH R8Z/TPLcIG12a7lNJyR+B9GJhE9dnAw= ARC-Authentication-Results: i=1; imf27.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=QgWgAc1Z; spf=pass (imf27.hostedemail.com: domain of kees@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=kees@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1753336232; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=4j17pn+//SHkaX8ONm+HlhNEvqzcDQ+QNAUfr7A3lEQ=; b=ghWNTRmpMEctEFCYUlcPNDl+jhDv+M6oexZxju/MtK3yRAxXczrvW4DW8jjVJZ/WdaSOuX LSk5PMvGUT96SgUVeDsCoJUX5UwB1QGIBDB3GH/HcRdTpgqroAc3EYuHWg1nWXP2pHRVS/ 4bzcdNg9cUMHzvFRTTU6owWuoeI9MyE= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 68FF46114C; Thu, 24 Jul 2025 05:50:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AC523C2BCB1; Thu, 24 Jul 2025 05:50:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1753336230; bh=p+7YUBTmffdnZ8pKAPuZ2rzC3Zvp9P0MFRgY7Xz1ydU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QgWgAc1Z4h7uumRs3FFTKmk6zT6WYc3ZB83iSXiAZCG3NFITyJRewAAhvM7SCdTB4 RxT11O3im9HodJy3iQHDCIux7eUlVSNQW6vtNOpk+XKga6Y6fSj/9wwhDqjvs9xFUF rCGWpttB1snOwFhFvWshiFbzZcXiHhUf9pIp6AbINpGCNdRMNio67jDVRMKJBh7BuE fdkdGJldi6mApzEQpFIUP62H0n6GbSbzIk9V1TPCmz4OwMw6YkG/4j38bPS4hFhKJ2 k2xWrnI6HQnV9XChu9iVDC9Tei62bf2nNEwWaweCdPI6/DaXZd3bddGMJWg3LAw2pQ U8NDMsvEgKExw== From: Kees Cook To: Arnd Bergmann Cc: Kees Cook , Masahiro Yamada , Nathan Chancellor , Nicolas Schier , Marco Elver , Andrey Konovalov , Andrey Ryabinin , Ard Biesheuvel , "Gustavo A. R. Silva" , linux-kbuild@vger.kernel.org, kasan-dev@googlegroups.com, linux-hardening@vger.kernel.org, Will Deacon , Catalin Marinas , Jonathan Cameron , Gavin Shan , "Russell King (Oracle)" , James Morse , Oza Pawandeep , Anshuman Khandual , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Paolo Bonzini , Mike Rapoport , Vitaly Kuznetsov , Henrique de Moraes Holschuh , Hans de Goede , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , "Rafael J. Wysocki" , Len Brown , Masami Hiramatsu , Michal Wilczynski , Juergen Gross , Andy Shevchenko , "Kirill A. Shutemov" , Roger Pau Monne , David Woodhouse , Usama Arif , "Guilherme G. Piccoli" , Thomas Huth , Brian Gerst , Hou Wenlong , Andrew Morton , "Peter Zijlstra (Intel)" , Luis Chamberlain , Sami Tolvanen , Christophe Leroy , Andy Lutomirski , Baoquan He , Alexander Graf , Changyuan Lyu , Paul Moore , James Morris , "Serge E. Hallyn" , Nick Desaulniers , Bill Wendling , Justin Stitt , Jan Beulich , Boqun Feng , Viresh Kumar , "Paul E. McKenney" , Bibo Mao , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, kvm@vger.kernel.org, ibm-acpi-devel@lists.sourceforge.net, platform-driver-x86@vger.kernel.org, linux-acpi@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-efi@vger.kernel.org, linux-mm@kvack.org, kexec@lists.infradead.org, linux-security-module@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH v4 4/4] kstack_erase: Support Clang stack depth tracking Date: Wed, 23 Jul 2025 22:50:28 -0700 Message-Id: <20250724055029.3623499-4-kees@kernel.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250724054419.it.405-kees@kernel.org> References: <20250724054419.it.405-kees@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2299; i=kees@kernel.org; h=from:subject; bh=p+7YUBTmffdnZ8pKAPuZ2rzC3Zvp9P0MFRgY7Xz1ydU=; b=owGbwMvMwCVmps19z/KJym7G02pJDBmNJ5fsPnPUwKQyTLv6YDRX59942Z9pVg4x/Z3tr6sPL i8Lmbqoo5SFQYyLQVZMkSXIzj3OxeNte7j7XEWYOaxMIEMYuDgFYCLbGRj+55xsNLv8fgpvz+zJ 97Q2v1jyfM6aXx5r3h0o/XvrBVfaBhWG/34taus75nNe6jl2+9BH9ihD5yM7dLl817dcaviWpVx +gAsA X-Developer-Key: i=kees@kernel.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: D10EF40005 X-Stat-Signature: bemjpurqwuh6jb4xg7yy8phcr9jcypzd X-HE-Tag: 1753336232-147518 X-HE-Meta: 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 VPXTf4Bt 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Wire up CONFIG_KSTACK_ERASE to Clang 21's new stack depth tracking callback[1] option. Link: https://clang.llvm.org/docs/SanitizerCoverage.html#tracing-stack-depth [1] Signed-off-by: Kees Cook --- Cc: Arnd Bergmann Cc: Masahiro Yamada Cc: Nathan Chancellor Cc: Nicolas Schier Cc: Marco Elver Cc: Andrey Konovalov Cc: Andrey Ryabinin Cc: Ard Biesheuvel Cc: "Gustavo A. R. Silva" Cc: Cc: Cc: --- security/Kconfig.hardening | 5 ++++- scripts/Makefile.kstack_erase | 6 ++++++ 2 files changed, 10 insertions(+), 1 deletion(-) diff --git a/security/Kconfig.hardening b/security/Kconfig.hardening index f7aa2024ab25..b9a5bc3430aa 100644 --- a/security/Kconfig.hardening +++ b/security/Kconfig.hardening @@ -82,10 +82,13 @@ choice endchoice +config CC_HAS_SANCOV_STACK_DEPTH_CALLBACK + def_bool $(cc-option,-fsanitize-coverage-stack-depth-callback-min=1) + config KSTACK_ERASE bool "Poison kernel stack before returning from syscalls" depends on HAVE_ARCH_KSTACK_ERASE - depends on GCC_PLUGINS + depends on GCC_PLUGINS || CC_HAS_SANCOV_STACK_DEPTH_CALLBACK help This option makes the kernel erase the kernel stack before returning from system calls. This has the effect of leaving diff --git a/scripts/Makefile.kstack_erase b/scripts/Makefile.kstack_erase index 5223d3a35817..c7bc2379e113 100644 --- a/scripts/Makefile.kstack_erase +++ b/scripts/Makefile.kstack_erase @@ -8,6 +8,12 @@ kstack-erase-cflags-$(CONFIG_GCC_PLUGIN_STACKLEAK_VERBOSE) += -fplugin-arg-stack DISABLE_KSTACK_ERASE := -fplugin-arg-stackleak_plugin-disable endif +ifdef CONFIG_CC_IS_CLANG +kstack-erase-cflags-y += -fsanitize-coverage=stack-depth +kstack-erase-cflags-y += -fsanitize-coverage-stack-depth-callback-min=$(CONFIG_KSTACK_ERASE_TRACK_MIN_SIZE) +DISABLE_KSTACK_ERASE := -fno-sanitize-coverage=stack-depth +endif + KSTACK_ERASE_CFLAGS := $(kstack-erase-cflags-y) export STACKLEAK_CFLAGS DISABLE_KSTACK_ERASE -- 2.34.1