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kselftest/arm64: Verify that we reject out of bounds VLs in sve-ptrace

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We do not currently have a test that asserts that we reject attempts to set
a vector length smaller than SVE_VL_MIN or larger than SVE_VL_MAX, add one
since that is our current behaviour.

Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Mark Brown
2025-08-20 19:29:03 +01:00
committed by Will Deacon
parent 5b7bdc4402
commit dd68f51feb
1 changed files with 31 additions and 1 deletions
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32
tools/testing/selftests/arm64/fp/sve-ptrace.c
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@@ -66,7 +66,7 @@ static const struct vec_type vec_types[] = {
};
#define VL_TESTS (((TEST_VQ_MAX - SVE_VQ_MIN) + 1) * 4)
#define FLAG_TESTS 2
#define FLAG_TESTS 4
#define FPSIMD_TESTS 2
#define EXPECTED_TESTS ((VL_TESTS + FLAG_TESTS + FPSIMD_TESTS) * ARRAY_SIZE(vec_types))
@@ -286,6 +286,25 @@ static void check_u32(unsigned int vl, const char *reg,
}
}
/* Set out of range VLs */
static void ptrace_set_vl_ranges(pid_t child, const struct vec_type *type)
{
struct user_sve_header sve;
int ret;
memset(&sve, 0, sizeof(sve));
sve.flags = SVE_PT_REGS_SVE;
sve.size = sizeof(sve);
ret = set_sve(child, type, &sve);
ksft_test_result(ret != 0, "%s Set invalid VL 0\n", type->name);
sve.vl = SVE_VL_MAX + SVE_VQ_BYTES;
ret = set_sve(child, type, &sve);
ksft_test_result(ret != 0, "%s Set invalid VL %d\n", type->name,
SVE_VL_MAX + SVE_VQ_BYTES);
}
/* Access the FPSIMD registers via the SVE regset */
static void ptrace_sve_fpsimd(pid_t child, const struct vec_type *type)
{
@@ -719,6 +738,17 @@ static int do_parent(pid_t child)
vec_types[i].name);
}
/* Setting out of bounds VLs should fail */
if (getauxval(vec_types[i].hwcap_type) & vec_types[i].hwcap) {
ptrace_set_vl_ranges(child, &vec_types[i]);
} else {
ksft_test_result_skip("%s Set invalid VL 0\n",
vec_types[i].name);
ksft_test_result_skip("%s Set invalid VL %d\n",
vec_types[i].name,
SVE_VL_MAX + SVE_VQ_BYTES);
}
/* Step through every possible VQ */
for (vq = SVE_VQ_MIN; vq <= TEST_VQ_MAX; vq++) {
vl = sve_vl_from_vq(vq);