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Tue, 13 May 2025 09:35:15 -0700 (PDT) Date: Tue, 13 May 2025 17:34:38 +0100 In-Reply-To: <20250513163438.3942405-1-tabba@google.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250513163438.3942405-1-tabba@google.com> X-Mailer: git-send-email 2.49.0.1045.g170613ef41-goog Message-ID: <20250513163438.3942405-18-tabba@google.com> Subject: [PATCH v9 17/17] KVM: selftests: Test guest_memfd same-range validation From: Fuad Tabba To: kvm@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mm@kvack.org Cc: pbonzini@redhat.com, chenhuacai@kernel.org, mpe@ellerman.id.au, anup@brainfault.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, seanjc@google.com, viro@zeniv.linux.org.uk, brauner@kernel.org, willy@infradead.org, akpm@linux-foundation.org, xiaoyao.li@intel.com, yilun.xu@intel.com, chao.p.peng@linux.intel.com, jarkko@kernel.org, amoorthy@google.com, dmatlack@google.com, isaku.yamahata@intel.com, mic@digikod.net, vbabka@suse.cz, vannapurve@google.com, ackerleytng@google.com, mail@maciej.szmigiero.name, david@redhat.com, michael.roth@amd.com, wei.w.wang@intel.com, liam.merwick@oracle.com, isaku.yamahata@gmail.com, kirill.shutemov@linux.intel.com, suzuki.poulose@arm.com, steven.price@arm.com, quic_eberman@quicinc.com, quic_mnalajal@quicinc.com, quic_tsoni@quicinc.com, quic_svaddagi@quicinc.com, quic_cvanscha@quicinc.com, quic_pderrin@quicinc.com, quic_pheragu@quicinc.com, catalin.marinas@arm.com, james.morse@arm.com, yuzenghui@huawei.com, oliver.upton@linux.dev, maz@kernel.org, will@kernel.org, qperret@google.com, keirf@google.com, roypat@amazon.co.uk, shuah@kernel.org, hch@infradead.org, jgg@nvidia.com, rientjes@google.com, jhubbard@nvidia.com, fvdl@google.com, hughd@google.com, jthoughton@google.com, peterx@redhat.com, pankaj.gupta@amd.com, ira.weiny@intel.com, tabba@google.com Content-Type: text/plain; charset="UTF-8" From: Ackerley Tng Add some selftests for guest_memfd same-range validation, which check that the slot userspace_addr covers the same range as the memory in guest_memfd: + When slot->userspace_addr is set to 0, there should be no range match validation on guest_memfd binding. + guest_memfd binding should fail if + slot->userspace_addr is not from guest_memfd + slot->userspace_addr is mmap()ed from some other file + slot->userspace_addr is mmap()ed from some other guest_memfd + slot->userspace_addr is mmap()ed from a different range in the same guest_memfd + guest_memfd binding should succeed if slot->userspace_addr is mmap()ed from the same range in the same guest_memfd provided in slot->guest_memfd Signed-off-by: Ackerley Tng Signed-off-by: Fuad Tabba --- .../testing/selftests/kvm/guest_memfd_test.c | 168 ++++++++++++++++++ 1 file changed, 168 insertions(+) diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing/selftests/kvm/guest_memfd_test.c index 443c49185543..60aaba5808a5 100644 --- a/tools/testing/selftests/kvm/guest_memfd_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_test.c @@ -197,6 +197,173 @@ static void test_create_guest_memfd_multiple(struct kvm_vm *vm) close(fd1); } +#define GUEST_MEMFD_TEST_SLOT 10 +#define GUEST_MEMFD_TEST_GPA 0x100000000 + +static void +test_bind_guest_memfd_disabling_range_match_validation(struct kvm_vm *vm, + int fd) +{ + size_t page_size = getpagesize(); + int ret; + + ret = __vm_set_user_memory_region2(vm, GUEST_MEMFD_TEST_SLOT, + KVM_MEM_GUEST_MEMFD, + GUEST_MEMFD_TEST_GPA, page_size, 0, + fd, 0); + TEST_ASSERT(!ret, + "setting slot->userspace_addr to 0 should disable validation"); + ret = __vm_set_user_memory_region2(vm, GUEST_MEMFD_TEST_SLOT, + KVM_MEM_GUEST_MEMFD, + GUEST_MEMFD_TEST_GPA, 0, 0, + fd, 0); + TEST_ASSERT(!ret, "Deleting memslot should work"); +} + +static void +test_bind_guest_memfd_anon_memory_in_userspace_addr(struct kvm_vm *vm, int fd) +{ + size_t page_size = getpagesize(); + void *userspace_addr; + int ret; + + userspace_addr = mmap(NULL, page_size, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + + ret = __vm_set_user_memory_region2(vm, GUEST_MEMFD_TEST_SLOT, + KVM_MEM_GUEST_MEMFD, + GUEST_MEMFD_TEST_GPA, page_size, + userspace_addr, fd, 0); + TEST_ASSERT(ret == -1, + "slot->userspace_addr is not from the guest_memfd and should fail"); +} + +static void test_bind_guest_memfd_shared_memory_other_file_in_userspace_addr( + struct kvm_vm *vm, int fd) +{ + size_t page_size = getpagesize(); + void *userspace_addr; + int other_fd; + int ret; + + other_fd = memfd_create("shared_memory_other_file", 0); + TEST_ASSERT(other_fd > 0, "Creating other file should succeed"); + + userspace_addr = mmap(NULL, page_size, PROT_READ | PROT_WRITE, + MAP_SHARED, other_fd, 0); + + ret = __vm_set_user_memory_region2(vm, GUEST_MEMFD_TEST_SLOT, + KVM_MEM_GUEST_MEMFD, + GUEST_MEMFD_TEST_GPA, page_size, + userspace_addr, fd, 0); + TEST_ASSERT(ret == -1, + "slot->userspace_addr is not from the guest_memfd and should fail"); + + TEST_ASSERT(!munmap(userspace_addr, page_size), + "munmap() to cleanup should succeed"); + + close(other_fd); +} + +static void +test_bind_guest_memfd_other_guest_memfd_in_userspace_addr(struct kvm_vm *vm, + int fd) +{ + size_t page_size = getpagesize(); + void *userspace_addr; + int other_fd; + int ret; + + other_fd = vm_create_guest_memfd(vm, page_size * 2, + GUEST_MEMFD_FLAG_SUPPORT_SHARED); + TEST_ASSERT(other_fd > 0, "Creating other file should succeed"); + + userspace_addr = mmap(NULL, page_size, PROT_READ | PROT_WRITE, + MAP_SHARED, other_fd, 0); + + ret = __vm_set_user_memory_region2(vm, GUEST_MEMFD_TEST_SLOT, + KVM_MEM_GUEST_MEMFD, + GUEST_MEMFD_TEST_GPA, page_size, + userspace_addr, fd, 0); + TEST_ASSERT(ret == -1, + "slot->userspace_addr is not from the guest_memfd and should fail"); + + TEST_ASSERT(!munmap(userspace_addr, page_size), + "munmap() to cleanup should succeed"); + + close(other_fd); +} + +static void +test_bind_guest_memfd_other_range_in_userspace_addr(struct kvm_vm *vm, int fd) +{ + size_t page_size = getpagesize(); + void *userspace_addr; + int ret; + + userspace_addr = mmap(NULL, page_size, PROT_READ | PROT_WRITE, + MAP_SHARED, fd, page_size); + + ret = __vm_set_user_memory_region2(vm, GUEST_MEMFD_TEST_SLOT, + KVM_MEM_GUEST_MEMFD, + GUEST_MEMFD_TEST_GPA, page_size, + userspace_addr, fd, 0); + TEST_ASSERT(ret == -1, + "slot->userspace_addr is not from the same range and should fail"); + + TEST_ASSERT(!munmap(userspace_addr, page_size), + "munmap() to cleanup should succeed"); +} + +static void +test_bind_guest_memfd_same_range_in_userspace_addr(struct kvm_vm *vm, int fd) +{ + size_t page_size = getpagesize(); + void *userspace_addr; + int ret; + + userspace_addr = mmap(NULL, page_size, PROT_READ | PROT_WRITE, + MAP_SHARED, fd, page_size); + + ret = __vm_set_user_memory_region2(vm, GUEST_MEMFD_TEST_SLOT, + KVM_MEM_GUEST_MEMFD, + GUEST_MEMFD_TEST_GPA, page_size, + userspace_addr, fd, page_size); + TEST_ASSERT(!ret, + "slot->userspace_addr is the same range and should succeed"); + + TEST_ASSERT(!munmap(userspace_addr, page_size), + "munmap() to cleanup should succeed"); + + ret = __vm_set_user_memory_region2(vm, GUEST_MEMFD_TEST_SLOT, + KVM_MEM_GUEST_MEMFD, + GUEST_MEMFD_TEST_GPA, 0, 0, + fd, 0); + TEST_ASSERT(!ret, "Deleting memslot should work"); +} + +static void test_bind_guest_memfd_wrt_userspace_addr(struct kvm_vm *vm) +{ + size_t page_size = getpagesize(); + int fd; + + if (!vm_check_cap(vm, KVM_CAP_GUEST_MEMFD) || + !vm_check_cap(vm, KVM_CAP_GMEM_SHARED_MEM)) + return; + + fd = vm_create_guest_memfd(vm, page_size * 2, + GUEST_MEMFD_FLAG_SUPPORT_SHARED); + + test_bind_guest_memfd_disabling_range_match_validation(vm, fd); + test_bind_guest_memfd_anon_memory_in_userspace_addr(vm, fd); + test_bind_guest_memfd_shared_memory_other_file_in_userspace_addr(vm, fd); + test_bind_guest_memfd_other_guest_memfd_in_userspace_addr(vm, fd); + test_bind_guest_memfd_other_range_in_userspace_addr(vm, fd); + test_bind_guest_memfd_same_range_in_userspace_addr(vm, fd); + + close(fd); +} + static void test_with_type(unsigned long vm_type, uint64_t guest_memfd_flags, bool expect_mmap_allowed) { @@ -214,6 +381,7 @@ static void test_with_type(unsigned long vm_type, uint64_t guest_memfd_flags, vm = vm_create_barebones_type(vm_type); test_create_guest_memfd_multiple(vm); + test_bind_guest_memfd_wrt_userspace_addr(vm); test_create_guest_memfd_invalid_sizes(vm, guest_memfd_flags, page_size); fd = vm_create_guest_memfd(vm, total_size, guest_memfd_flags); -- 2.49.0.1045.g170613ef41-goog