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selftests: vDSO: unconditionally build chacha test

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Rather than using symlinks to find the vgetrandom-chacha.S file for each
arch, store this in a file that uses the compiler to determine
architecture, and then make use of weak symbols to skip the test on
architectures that don't provide the code.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Jason A. Donenfeld 2024-10-07 23:45:56 +02:00 committed by Shuah Khan
parent c66be905cd
commit 3b5992eaf7
8 changed files with 26 additions and 12 deletions
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1
tools/arch/arm64/vdso
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@ -1 +0,0 @@
../../../arch/arm64/kernel/vdso

1
tools/arch/loongarch/vdso
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@ -1 +0,0 @@
../../../arch/loongarch/vdso

1
tools/arch/powerpc/vdso
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@ -1 +0,0 @@
../../../arch/powerpc/kernel/vdso

1
tools/arch/s390/vdso
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@ -1 +0,0 @@
../../../arch/s390/kernel/vdso64

1
tools/arch/x86/vdso
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@ -1 +0,0 @@
../../../arch/x86/entry/vdso/

6
tools/testing/selftests/vDSO/Makefile
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@ -11,8 +11,8 @@ endif
TEST_GEN_PROGS += vdso_test_correctness
ifeq ($(ARCH)$(CONFIG_X86_32),$(filter $(ARCH)$(CONFIG_X86_32),x86 x86_64 loongarch arm64 powerpc s390))
TEST_GEN_PROGS += vdso_test_getrandom
TEST_GEN_PROGS += vdso_test_chacha
endif
TEST_GEN_PROGS += vdso_test_chacha
CFLAGS := -std=gnu99 -O2
@ -37,9 +37,9 @@ $(OUTPUT)/vdso_test_getrandom: CFLAGS += -isystem $(top_srcdir)/tools/include \
$(KHDR_INCLUDES) \
-isystem $(top_srcdir)/include/uapi
$(OUTPUT)/vdso_test_chacha: $(top_srcdir)/tools/arch/$(SRCARCH)/vdso/vgetrandom-chacha.S
$(OUTPUT)/vdso_test_chacha: vgetrandom-chacha.S
$(OUTPUT)/vdso_test_chacha: CFLAGS += -idirafter $(top_srcdir)/tools/include \
-idirafter $(top_srcdir)/tools/include/generated \
-idirafter $(top_srcdir)/arch/$(SRCARCH)/include \
-idirafter $(top_srcdir)/include \
-D__ASSEMBLY__ -Wa,--noexecstack
-Wa,--noexecstack

9
tools/testing/selftests/vDSO/vdso_test_chacha.c
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@ -3,6 +3,7 @@
* Copyright (C) 2022-2024 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#include <linux/compiler.h>
#include <tools/le_byteshift.h>
#include <sys/random.h>
#include <sys/auxv.h>
@ -73,10 +74,10 @@ static void reference_chacha20_blocks(uint8_t *dst_bytes, const uint32_t *key, u
counter[1] = s[13];
}
typedef uint8_t u8;
typedef uint32_t u32;
typedef uint64_t u64;
#include <vdso/getrandom.h>
void __weak __arch_chacha20_blocks_nostack(uint8_t *dst_bytes, const uint32_t *key, uint32_t *counter, size_t nblocks)
{
ksft_exit_skip("Not implemented on architecture\n");
}
int main(int argc, char *argv[])
{

18
tools/testing/selftests/vDSO/vgetrandom-chacha.S Normal file
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@ -0,0 +1,18 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2024 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#define __ASSEMBLY__
#if defined(__aarch64__)
#include "../../../../arch/arm64/kernel/vdso/vgetrandom-chacha.S"
#elif defined(__loongarch__)
#include "../../../../arch/loongarch/vdso/vgetrandom-chacha.S"
#elif defined(__powerpc__) || defined(__powerpc64__)
#include "../../../../arch/powerpc/kernel/vdso/vgetrandom-chacha.S"
#elif defined(__s390x__)
#include "../../../../arch/s390/kernel/vdso64/vgetrandom-chacha.S"
#elif defined(__x86_64__)
#include "../../../../arch/x86/entry/vdso/vgetrandom-chacha.S"
#endif