Commit aa7d3c8b authored by Mark Brown's avatar Mark Brown Committed by Catalin Marinas
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kselftest/arm64: Fix SVE write data generation for SME only systems 



fp-ptrace does not handle SME only systems correctly when generating data,
on SME only systems scenarios where we are not in streaming mode will not
have an expected vector length. This leads to attempts to do memcpy()s of
zero byte arrays which can crash, fix this by skipping generation of SVE
data for cases where we do not expect to have an active vector length.

Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250718-arm64-fp-ptrace-sme-only-v1-2-3b96dd19a503@kernel.org


Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent b021f45d

tools/testing/selftests/arm64/fp/fp-ptrace.c

+6 −0
Original line number Diff line number Diff line
@@ -1151,6 +1151,9 @@ static void sve_write_expected(struct test_config *config) 
	int vl = vl_expected(config);

	int sme_vq = __sve_vq_from_vl(config->sme_vl_expected);



	if (!vl)

		return;



	fill_random(z_expected, __SVE_ZREGS_SIZE(__sve_vq_from_vl(vl)));

	fill_random(p_expected, __SVE_PREGS_SIZE(__sve_vq_from_vl(vl)));
@@ -1178,6 +1181,9 @@ static void sve_write_sve(pid_t child, struct test_config *config) 
	vl = vl_expected(config);

	vq = __sve_vq_from_vl(vl);



	if (!vl)

		return;



	iov.iov_len = SVE_PT_SVE_OFFSET + SVE_PT_SVE_SIZE(vq, SVE_PT_REGS_SVE);

	iov.iov_base = malloc(iov.iov_len);

	if (!iov.iov_base) {