linux-kernel - Re: [PATCH] KVM: selftests: Add -U_FORTIFY_SOURCE to avoid some unpredictable test failures

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Message-ID: <177016372870.574944.18012293019277636771.b4-ty@google.com>
Date: Tue,  3 Feb 2026 16:10:15 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, pbonzini@...hat.com, shuah@...nel.org, 
	Zhiquan Li <zhiquan_li@....com>
Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: selftests: Add -U_FORTIFY_SOURCE to avoid some
 unpredictable test failures

On Thu, 22 Jan 2026 13:35:50 +0800, Zhiquan Li wrote:
> 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@....
> 
> [...]

Applied to kvm-x86 fixes, thanks!

[1/1] KVM: selftests: Add -U_FORTIFY_SOURCE to avoid some unpredictable test failures
      https://github.com/kvm-x86/linux/commit/e396a7422265

--
https://github.com/kvm-x86/linux/tree/next