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 EA79915C158; Sun, 7 Sep 2025 20:32:36 +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=1757277157; cv=none; b=QmQADs0ODT7J8ftsmR0P5luj/W7JT8Aih+PtECEUyNCRlBsVCe6do+csvs0zKEVMPEHew8jmzmiEctgLLoVHmPm2T8L7B3Y3hyQFrSYKBa49PJlKpo7NUSVJ3ih0yjOrTxtqjgnX5MZG+QHXrIWZvYfOCOaqZLAS+TZ34jpimZ8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757277157; c=relaxed/simple; bh=v6uQY5Zn9vPiiZtLV5vq7ID7CKXGAa0ZbBEd0fCd/SQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=JPqiO7UomRtNFp6gtxX012eDEDiDeJMCgQDFuNBwtiFk+Dfz5DqwglaaX804ANtp/XhVURN0Zc+rSnGRGZ++1AQlEzcyFs2ilAZ9wPlw/NnhyDEfF3/P91/gkowVNWKXsCDHxsq+Hp1KVLdwBeYqMYiIi7o1bvU8MBbVMIad+io= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=nPj2MOzn; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="nPj2MOzn" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4326AC4CEF0; Sun, 7 Sep 2025 20:32:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1757277156; bh=v6uQY5Zn9vPiiZtLV5vq7ID7CKXGAa0ZbBEd0fCd/SQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nPj2MOznFaLnIu6l5cZIckGHzlalCVKiN1lXVZTqQ/gcOWgevVckrpa0x1Ple1d2u tgIZgozzoJDyhkXxg3QmevdHVINF/J3yvUTFIn47EdBLJcQkd1WdpHA6iDMA2M6lKt UkVfZ2JvwRju+3QBp/cDVeST0Cs9nDg6ib7pOLJA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ada Couprie Diaz , Yeoreum Yun , Alexander Potapenko , Andrey Konovalov , Andrey Ryabinin , Dmitriy Vyukov , Marco Elver , Marc Rutland , Michael Ellerman , Nathan Chancellor , Vincenzo Frascino , Andrew Morton Subject: [PATCH 6.12 103/175] kasan: fix GCC mem-intrinsic prefix with sw tags Date: Sun, 7 Sep 2025 21:58:18 +0200 Message-ID: <20250907195617.288371662@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250907195614.892725141@linuxfoundation.org> References: <20250907195614.892725141@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ada Couprie Diaz commit 51337a9a3a404fde0f5337662ffc7699793dfeb5 upstream. GCC doesn't support "hwasan-kernel-mem-intrinsic-prefix", only "asan-kernel-mem-intrinsic-prefix"[0], while LLVM supports both. This is already taken into account when checking "CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX", but not in the KASAN Makefile adding those parameters when "CONFIG_KASAN_SW_TAGS" is enabled. Replace the version check with "CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX", which already validates that mem-intrinsic prefix parameter can be used, and choose the correct name depending on compiler. GCC 13 and above trigger "CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX" which prevents `mem{cpy,move,set}()` being redefined in "mm/kasan/shadow.c" since commit 36be5cba99f6 ("kasan: treat meminstrinsic as builtins in uninstrumented files"), as we expect the compiler to prefix those calls with `__(hw)asan_` instead. But as the option passed to GCC has been incorrect, the compiler has not been emitting those prefixes, effectively never calling the instrumented versions of `mem{cpy,move,set}()` with "CONFIG_KASAN_SW_TAGS" enabled. If "CONFIG_FORTIFY_SOURCES" is enabled, this issue would be mitigated as it redefines `mem{cpy,move,set}()` and properly aliases the `__underlying_mem*()` that will be called to the instrumented versions. Link: https://lkml.kernel.org/r/20250821120735.156244-1-ada.coupriediaz@arm.com Link: https://gcc.gnu.org/onlinedocs/gcc-13.4.0/gcc/Optimize-Options.html [0] Signed-off-by: Ada Couprie Diaz Fixes: 36be5cba99f6 ("kasan: treat meminstrinsic as builtins in uninstrumented files") Reviewed-by: Yeoreum Yun Cc: Alexander Potapenko Cc: Andrey Konovalov Cc: Andrey Ryabinin Cc: Dmitriy Vyukov Cc: Marco Elver Cc: Marc Rutland Cc: Michael Ellerman Cc: Nathan Chancellor Cc: Vincenzo Frascino Cc: Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- scripts/Makefile.kasan | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) --- a/scripts/Makefile.kasan +++ b/scripts/Makefile.kasan @@ -86,10 +86,14 @@ kasan_params += hwasan-instrument-stack= hwasan-use-short-granules=0 \ hwasan-inline-all-checks=0 -# Instrument memcpy/memset/memmove calls by using instrumented __hwasan_mem*(). -ifeq ($(call clang-min-version, 150000)$(call gcc-min-version, 130000),y) - kasan_params += hwasan-kernel-mem-intrinsic-prefix=1 -endif +# Instrument memcpy/memset/memmove calls by using instrumented __(hw)asan_mem*(). +ifdef CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX + ifdef CONFIG_CC_IS_GCC + kasan_params += asan-kernel-mem-intrinsic-prefix=1 + else + kasan_params += hwasan-kernel-mem-intrinsic-prefix=1 + endif +endif # CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX endif # CONFIG_KASAN_SW_TAGS