| Message ID | 20240523154102.2236133-1-colin.i.king@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [next,V2] selftests: kvm: fix shift of 32 bit unsigned int more than 32 bits | expand |
On Thu, 23 May 2024 16:41:02 +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] > > [...] Applied to kvm-x86 fixes, thanks! [1/1] selftests: kvm: fix shift of 32 bit unsigned int more than 32 bits https://github.com/kvm-x86/linux/commit/9a68cefe9f05 -- https://github.com/kvm-x86/linux/tree/next
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(i)) test_init2(vm_type, &(struct kvm_sev_init){ .vmsa_features = BIT_ULL(i) }); }
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@gmail.com> --- V2: Fix incorrect variable in 2nd BIT_ULL(), kudos to Dan Carpenter for catching this error. --- tools/testing/selftests/kvm/x86_64/sev_init2_tests.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)