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kselftest/arm64: Check that unsupported regsets fail in sve-ptrace

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Add a test which verifies that NT_ARM_SVE and NT_ARM_SSVE reads and writes
are rejected as expected when the relevant architecture feature is not
supported.

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 19:29:04 +01:00
committed by Will Deacon
parent dd68f51feb
commit 09b5febf84
1 changed files with 46 additions and 0 deletions
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46
tools/testing/selftests/arm64/fp/sve-ptrace.c
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@@ -174,6 +174,38 @@ static int set_sve(pid_t pid, const struct vec_type *type,
return ret;
}
/* A read operation fails */
static void read_fails(pid_t child, const struct vec_type *type)
{
struct user_sve_header *new_sve = NULL;
size_t new_sve_size = 0;
void *ret;
ret = get_sve(child, type, (void **)&new_sve, &new_sve_size);
ksft_test_result(ret == NULL, "%s unsupported read fails\n",
type->name);
free(new_sve);
}
/* A write operation fails */
static void write_fails(pid_t child, const struct vec_type *type)
{
struct user_sve_header sve;
int ret;
/* Just the header, no data */
memset(&sve, 0, sizeof(sve));
sve.size = sizeof(sve);
sve.flags = SVE_PT_REGS_SVE;
sve.vl = SVE_VL_MIN;
ret = set_sve(child, type, &sve);
ksft_test_result(ret != 0, "%s unsupported write fails\n",
type->name);
}
/* Validate setting and getting the inherit flag */
static void ptrace_set_get_inherit(pid_t child, const struct vec_type *type)
{
@@ -718,6 +750,20 @@ static int do_parent(pid_t child)
}
for (i = 0; i < ARRAY_SIZE(vec_types); i++) {
/*
* If the vector type isn't supported reads and writes
* should fail.
*/
if (!(getauxval(vec_types[i].hwcap_type) & vec_types[i].hwcap)) {
read_fails(child, &vec_types[i]);
write_fails(child, &vec_types[i]);
} else {
ksft_test_result_skip("%s unsupported read fails\n",
vec_types[i].name);
ksft_test_result_skip("%s unsupported write fails\n",
vec_types[i].name);
}
/* FPSIMD via SVE regset */
if (getauxval(vec_types[i].hwcap_type) & vec_types[i].hwcap) {
ptrace_sve_fpsimd(child, &vec_types[i]);