On Thu, May 23, 2024 at 12:38:02PM +0100, Colin Ian King wrote:
> Currrentl a 32 bit 1u value is being shifted more than 32 bits causing
> overflow and incorrect checking of bits 32-63. Fix this by using the
> BIT_ULL macro for shifting bits.
>
> Detected by cppcheck:
> sev_init2_tests.c:108:34: error: Shifting 32-bit value by 63 bits is
> undefined behaviour [shiftTooManyBits]
>
> Fixes: dfc083a181ba ("selftests: kvm: add tests for KVM_SEV_INIT2")
> Signed-off-by: Colin Ian King <colin.i.king@xxxxxxxxx>
> ---
> tools/testing/selftests/kvm/x86_64/sev_init2_tests.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/testing/selftests/kvm/x86_64/sev_init2_tests.c b/tools/testing/selftests/kvm/x86_64/sev_init2_tests.c
> index 7a4a61be119b..ea09f7a06aa4 100644
> --- a/tools/testing/selftests/kvm/x86_64/sev_init2_tests.c
> +++ b/tools/testing/selftests/kvm/x86_64/sev_init2_tests.c
> @@ -105,11 +105,11 @@ void test_features(uint32_t vm_type, uint64_t supported_features)
> int i;
>
> for (i = 0; i < 64; i++) {
> - if (!(supported_features & (1u << i)))
> + if (!(supported_features & BIT_ULL(i)))
> test_init2_invalid(vm_type,
> &(struct kvm_sev_init){ .vmsa_features = BIT_ULL(i) },
> "unknown feature");
> - else if (KNOWN_FEATURES & (1u << i))
> + else if (KNOWN_FEATURES & BIT_ULL(u))
^
Should be i. How does this build? :P
regards,
dan carpenter
