From: Sean Christopherson <seanjc@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
Marc Zyngier <maz@kernel.org>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>
Cc: James Morse <james.morse@arm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Oliver Upton <oliver.upton@linux.dev>, Tom Rix <trix@redhat.com>,
kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
kvmarm@lists.linux.dev, kvmarm@lists.cs.columbia.edu,
linux-riscv@lists.infradead.org, llvm@lists.linux.dev,
linux-kernel@vger.kernel.org,
Ricardo Koller <ricarkol@google.com>,
Sean Christopherson <seanjc@google.com>,
Aaron Lewis <aaronlewis@google.com>,
Raghavendra Rao Ananta <rananta@google.com>
Subject: [PATCH 09/14] KVM: selftests: Explicitly disable builtins for mem*() overrides
Date: Tue, 13 Dec 2022 00:16:48 +0000 [thread overview]
Message-ID: <20221213001653.3852042-10-seanjc@google.com> (raw)
In-Reply-To: <20221213001653.3852042-1-seanjc@google.com>
Explicitly disable the compiler's builtin memcmp(), memcpy(), and
memset(). Because only lib/string_override.c is built with -ffreestanding,
the compiler reserves the right to do what it wants and can try to link the
non-freestanding code to its own crud.
/usr/bin/x86_64-linux-gnu-ld: /lib/x86_64-linux-gnu/libc.a(memcmp.o): in function `memcmp_ifunc':
(.text+0x0): multiple definition of `memcmp'; tools/testing/selftests/kvm/lib/string_override.o:
tools/testing/selftests/kvm/lib/string_override.c:15: first defined here
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Fixes: 6b6f71484bf4 ("KVM: selftests: Implement memcmp(), memcpy(), and memset() for guest use")
Reported-by: Aaron Lewis <aaronlewis@google.com>
Reported-by: Raghavendra Rao Ananta <rananta@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
tools/testing/selftests/kvm/Makefile | 1 +
1 file changed, 1 insertion(+)
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index a6050dcc381a..6594ed51eeea 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -191,6 +191,7 @@ else
LINUX_TOOL_ARCH_INCLUDE = $(top_srcdir)/tools/arch/$(ARCH)/include
endif
CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \
+ -fno-builtin-memcmp -fno-builtin-memcpy -fno-builtin-memset \
-fno-stack-protector -fno-PIE -I$(LINUX_TOOL_INCLUDE) \
-I$(LINUX_TOOL_ARCH_INCLUDE) -I$(LINUX_HDR_PATH) -Iinclude \
-I$(<D) -Iinclude/$(ARCH_DIR) -I ../rseq -I.. $(EXTRA_CFLAGS) \
--
2.39.0.rc1.256.g54fd8350bd-goog
next prev parent reply other threads:[~2022-12-13 0:17 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-13 0:16 [PATCH 00/14] KVM: selftests: Clang fixes, Makefile cleanup Sean Christopherson
2022-12-13 0:16 ` [PATCH 01/14] KVM: selftests: Define literal to asm constraint in aarch64 as unsigned long Sean Christopherson
2022-12-13 9:51 ` Philippe Mathieu-Daudé
2022-12-13 0:16 ` [PATCH 02/14] KVM: selftests: Delete dead code in x86_64/vmx_tsc_adjust_test.c Sean Christopherson
2022-12-13 0:16 ` [PATCH 03/14] KVM: selftests: Fix divide-by-zero bug in memslot_perf_test Sean Christopherson
2022-12-13 9:46 ` Philippe Mathieu-Daudé
2022-12-13 0:16 ` [PATCH 04/14] KVM: selftests: Use pattern matching in .gitignore Sean Christopherson
2022-12-13 0:16 ` [PATCH 05/14] KVM: selftests: Fix a typo in x86-64's kvm_get_cpu_address_width() Sean Christopherson
2022-12-13 9:47 ` Philippe Mathieu-Daudé
2022-12-13 0:16 ` [PATCH 06/14] KVM: selftests: Rename UNAME_M to ARCH_DIR, fill explicitly for x86 Sean Christopherson
2022-12-13 20:03 ` Sean Christopherson
2022-12-14 9:43 ` Marc Zyngier
2022-12-24 9:12 ` Paolo Bonzini
2022-12-13 0:16 ` [PATCH 07/14] KVM: selftests: Use proper function prototypes in probing code Sean Christopherson
2022-12-13 9:48 ` Philippe Mathieu-Daudé
2022-12-13 0:16 ` [PATCH 08/14] KVM: selftests: Probe -no-pie with actual CFLAGS used to compile Sean Christopherson
2022-12-13 0:16 ` Sean Christopherson [this message]
2022-12-24 9:16 ` [PATCH 09/14] KVM: selftests: Explicitly disable builtins for mem*() overrides Paolo Bonzini
2022-12-13 0:16 ` [PATCH 10/14] KVM: selftests: Include lib.mk before consuming $(CC) Sean Christopherson
2022-12-24 9:18 ` Paolo Bonzini
2022-12-13 0:16 ` [PATCH 11/14] KVM: selftests: Disable "gnu-variable-sized-type-not-at-end" warning Sean Christopherson
2022-12-13 1:36 ` Nick Desaulniers
2022-12-13 2:13 ` Sean Christopherson
2023-01-11 16:23 ` Paolo Bonzini
2022-12-13 0:16 ` [PATCH 12/14] KVM: selftests: Use wildcards to find library source files Sean Christopherson
2022-12-24 9:23 ` Paolo Bonzini
2023-01-04 1:09 ` Sean Christopherson
2022-12-13 0:16 ` [PATCH 13/14] KVM: selftests: Use wildcards to find targets and test " Sean Christopherson
2022-12-13 0:16 ` [PATCH 14/14] KVM: selftests: Enable RSEQ test for RISC-V Sean Christopherson
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