From mboxrd@z Thu Jan 1 00:00:00 1970 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 51CFF214A97; Thu, 24 Jul 2025 05:50:31 +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=1753336231; cv=none; b=rKlj5D++bNbwmvO76dnFCJzYwjVio0YSpmq14HURGFV74ND1esBj8UZWt533/F+BS33mRp3rh0tiGSavk3yq9Df0cJl8KqL4AfCEdzfAh/wQXG27GadC+RE2bCjl9UAePn+AS/Qu3ETHJWbHJLXy5w2f6BZhDrKCLzTIkG9rYpw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753336231; c=relaxed/simple; bh=9V+bffTinVGVEjmw6TF+C5G0YfQpy53YZa3Wm2q7aj4=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=U4zmZtm8VtNV+uC/B4obo8gBl+6H/a4Qh7n0aIRs3YNDmcbTor2Ll5AwmJhz6UX1fpQAVWS7VbG30EVbJrfq4fIBE9B/SEI2eidnfBjsY38bzN18g9JVf1Gv27rsLTefC4pTFup9wFlpgf3KL2UbkdPgiN1O6sf5tTMamFnl8HI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ooTp5DYa; 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="ooTp5DYa" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9D569C2BCB0; 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=9V+bffTinVGVEjmw6TF+C5G0YfQpy53YZa3Wm2q7aj4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ooTp5DYalG+7sCY7UY80o0GaKZMJuJsxJyjGuabcQLgPm5nuSMqxAePrfT7GjvhdK oF9fORgAmBuhwOhWaT/I1eVzeHaxvCjNnvP3mFcCVtrohHTelgnJB8AxJRHMej+Mg4 NFDjdV1sYJAqwLAHAKG+Pc7P7tPoem5TaSnEds9YldJcU6sAmB42ruRa5SIZpDw1hv cKr4I8Z7LDvwzyqdEhc2lYfeETzrrTMLlCXC7ApBabnc8CBhH419Ml2t43642mwJKw GdpLf5pCI2siQYBJvR4jNh/zgf/ZyAdgBMjqYlW1WxwimCTLeg3bNom27bS+51Pyca 3cu5ZswAR3k0w== From: Kees Cook To: Arnd Bergmann Cc: Kees Cook , Marco Elver , Andrey Konovalov , Andrey Ryabinin , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Ard Biesheuvel , "Kirill A. Shutemov" , Hou Wenlong , Andrew Morton , Masahiro Yamada , "Peter Zijlstra (Intel)" , Luis Chamberlain , Sami Tolvanen , Christophe Leroy , kasan-dev@googlegroups.com, Will Deacon , Catalin Marinas , Jonathan Cameron , Gavin Shan , "Russell King (Oracle)" , James Morse , Oza Pawandeep , Anshuman Khandual , 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 , Nathan Chancellor , Nicolas Schier , "Gustavo A. R. Silva" , 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, 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, linux-kbuild@vger.kernel.org, linux-hardening@vger.kernel.org, kexec@lists.infradead.org, linux-security-module@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH v4 3/4] init.h: Disable sanitizer coverage for __init and __head Date: Wed, 23 Jul 2025 22:50:27 -0700 Message-Id: <20250724055029.3623499-3-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> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2887; i=kees@kernel.org; h=from:subject; bh=9V+bffTinVGVEjmw6TF+C5G0YfQpy53YZa3Wm2q7aj4=; b=owGbwMvMwCVmps19z/KJym7G02pJDBmNJxdz3tX005Y/rnL4YOLkChWuJ+9Wl0ZxtHAnf5w+4 +zlC8f3dZSyMIhxMciKKbIE2bnHuXi8bQ93n6sIM4eVCWQIAxenAEzkYR0jQ3OLrmDdCpsGS/2v XwqtbKYZz2RJ7Lh0a141x9MPJVGnpzIydBStU54v9Wp98GqlzKdyYSda/YzleKsypsy4O3tZzgI uBgA= X-Developer-Key: i=kees@kernel.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit While __noinstr already contained __no_sanitize_coverage, it needs to be added to __init and __head section markings to support the Clang implementation of CONFIG_KSTACK_ERASE. This is to make sure the stack depth tracking callback is not executed in unsupported contexts. The other sanitizer coverage options (trace-pc and trace-cmp) aren't needed in __head nor __init either ("We are interested in code coverage as a function of a syscall inputs"[1]), so this is fine to disable for them as well. Link: https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/kernel/kcov.c?h=v6.14#n179 [1] Acked-by: Marco Elver Signed-off-by: Kees Cook --- Cc: Marco Elver Cc: Andrey Konovalov Cc: Andrey Ryabinin Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: Cc: "H. Peter Anvin" Cc: Ard Biesheuvel Cc: "Kirill A. Shutemov" Cc: Hou Wenlong Cc: Andrew Morton Cc: Masahiro Yamada Cc: "Peter Zijlstra (Intel)" Cc: Luis Chamberlain Cc: Sami Tolvanen Cc: Arnd Bergmann Cc: Christophe Leroy Cc: --- arch/x86/include/asm/init.h | 2 +- include/linux/init.h | 4 +++- 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/init.h b/arch/x86/include/asm/init.h index 8b1b1abcef15..6bfdaeddbae8 100644 --- a/arch/x86/include/asm/init.h +++ b/arch/x86/include/asm/init.h @@ -5,7 +5,7 @@ #if defined(CONFIG_CC_IS_CLANG) && CONFIG_CLANG_VERSION < 170000 #define __head __section(".head.text") __no_sanitize_undefined __no_stack_protector #else -#define __head __section(".head.text") __no_sanitize_undefined +#define __head __section(".head.text") __no_sanitize_undefined __no_sanitize_coverage #endif struct x86_mapping_info { diff --git a/include/linux/init.h b/include/linux/init.h index ee1309473bc6..c65a050d52a7 100644 --- a/include/linux/init.h +++ b/include/linux/init.h @@ -49,7 +49,9 @@ /* These are for everybody (although not all archs will actually discard it in modules) */ -#define __init __section(".init.text") __cold __latent_entropy __noinitretpoline +#define __init __section(".init.text") __cold __latent_entropy \ + __noinitretpoline \ + __no_sanitize_coverage #define __initdata __section(".init.data") #define __initconst __section(".init.rodata") #define __exitdata __section(".exit.data") -- 2.34.1