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 C68CA352C3C for ; Sat, 7 Feb 2026 15:05:51 +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=1770476751; cv=none; b=ErvUhVGMZi54eEqFaHVTWR08NOMgK0aa9bE24zo1LQDMYslbd1FdFS8Ux7Z5+ZXf8tY2COofsFXXIj6JJ2RN4iGgbobpWWMb6BtBbqT2PxJvX/epliR2OBXb5AEXW1U/rcxBgDBZpFlV/LlMszpGZqXa9oaZ15bG0jBJH2WNvrc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770476751; c=relaxed/simple; bh=NpJ/JUsKwOZWZVFTHRP9bJ0xCPW4CS4e6USJ3Enq6JY=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=VciOeGdXjSEt5sQGKNEvhTZf1RUsAlXNXhCPJHU5ASQhhRiwIawNoT4i6EDX573xMc4LYjYVBsmanuaV7Yhitf54abTempEj0T5e+K3wZKjtEGKllaIAgtRYOHaT6CcdE2JegmM02uhiws8Ex2yRWOd4c7Dqk0oqX8SvI/ucoUI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=mFM5wTof; 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="mFM5wTof" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 34F00C19421; Sat, 7 Feb 2026 15:05:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1770476751; bh=NpJ/JUsKwOZWZVFTHRP9bJ0xCPW4CS4e6USJ3Enq6JY=; h=Subject:To:Cc:From:Date:From; b=mFM5wTofSJ9tJWKoeT+fAnJPy8U3qQx0G55BFkt3ADEIokWP07MmMSJAG6ef+ovP1 TjwH0G/hf+CSeyyN21MWzS2tpi5UT+xD38H4ry+6a0ml/3RCHverqyecWJQXZ0yUqB NaMq81sXF6SbiktaVykqVC3pr2bmcfWCk4jAKkkA= Subject: FAILED: patch "[PATCH] KVM: selftests: Add -U_FORTIFY_SOURCE to avoid some" failed to apply to 6.6-stable tree To: zhiquan_li@163.com,seanjc@google.com Cc: From: Date: Sat, 07 Feb 2026 16:04:55 +0100 Message-ID: <2026020755-gratitude-opulently-9cf8@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x e396a74222654486d6ab45dca5d0c54c408b8b91 # git commit -s git send-email --to '' --in-reply-to '2026020755-gratitude-opulently-9cf8@gregkh' --subject-prefix 'PATCH 6.6.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From e396a74222654486d6ab45dca5d0c54c408b8b91 Mon Sep 17 00:00:00 2001 From: Zhiquan Li Date: Thu, 22 Jan 2026 13:35:50 +0800 Subject: [PATCH] KVM: selftests: Add -U_FORTIFY_SOURCE to avoid some unpredictable test failures Some distributions (such as Ubuntu) configure GCC so that _FORTIFY_SOURCE is automatically enabled at -O1 or above. This results in some fortified version of definitions of standard library functions are included. While linker resolves the symbols, the fortified versions might override the definitions in lib/string_override.c and reference to those PLT entries in GLIBC. This is not a problem for the code in host, but it is a disaster for the guest code. E.g., if build and run x86/nested_emulation_test on Ubuntu 24.04 will encounter a L1 #PF due to memset() reference to __memset_chk@plt. The option -fno-builtin-memset is not helpful here, because those fortified versions are not built-in but some definitions which are included by header, they are for different intentions. In order to eliminate the unpredictable behaviors may vary depending on the linker and platform, add the "-U_FORTIFY_SOURCE" into CFLAGS to prevent from introducing the fortified definitions. Signed-off-by: Zhiquan Li Link: https://patch.msgid.link/20260122053551.548229-1-zhiquan_li@163.com Fixes: 6b6f71484bf4 ("KVM: selftests: Implement memcmp(), memcpy(), and memset() for guest use") Cc: stable@vger.kernel.org [sean: tag for stable] Signed-off-by: Sean Christopherson diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selftests/kvm/Makefile.kvm index ba5c2b643efa..d45bf4ccb3bf 100644 --- a/tools/testing/selftests/kvm/Makefile.kvm +++ b/tools/testing/selftests/kvm/Makefile.kvm @@ -251,6 +251,7 @@ LINUX_TOOL_INCLUDE = $(top_srcdir)/tools/include LINUX_TOOL_ARCH_INCLUDE = $(top_srcdir)/tools/arch/$(ARCH)/include CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \ -Wno-gnu-variable-sized-type-not-at-end -MD -MP -DCONFIG_64BIT \ + -U_FORTIFY_SOURCE \ -fno-builtin-memcmp -fno-builtin-memcpy \ -fno-builtin-memset -fno-builtin-strnlen \ -fno-stack-protector -fno-PIE -fno-strict-aliasing \