diff options
Diffstat (limited to 'tools/testing/selftests/sgx/main.c')
| -rw-r--r-- | tools/testing/selftests/sgx/main.c | 356 |
1 files changed, 310 insertions, 46 deletions
diff --git a/tools/testing/selftests/sgx/main.c b/tools/testing/selftests/sgx/main.c index e252015e0c15..370c4995f7c4 100644 --- a/tools/testing/selftests/sgx/main.c +++ b/tools/testing/selftests/sgx/main.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 /* Copyright(c) 2016-20 Intel Corporation. */ +#include <cpuid.h> #include <elf.h> #include <errno.h> #include <fcntl.h> @@ -21,6 +22,7 @@ #include "main.h" static const uint64_t MAGIC = 0x1122334455667788ULL; +static const uint64_t MAGIC2 = 0x8877665544332211ULL; vdso_sgx_enter_enclave_t vdso_sgx_enter_enclave; struct vdso_symtab { @@ -107,12 +109,32 @@ static Elf64_Sym *vdso_symtab_get(struct vdso_symtab *symtab, const char *name) return NULL; } +/* + * Return the offset in the enclave where the data segment can be found. + * The first RW segment loaded is the TCS, skip that to get info on the + * data segment. + */ +static off_t encl_get_data_offset(struct encl *encl) +{ + int i; + + for (i = 1; i < encl->nr_segments; i++) { + struct encl_segment *seg = &encl->segment_tbl[i]; + + if (seg->prot == (PROT_READ | PROT_WRITE)) + return seg->offset; + } + + return -1; +} + FIXTURE(enclave) { struct encl encl; struct sgx_enclave_run run; }; -FIXTURE_SETUP(enclave) +static bool setup_test_encl(unsigned long heap_size, struct encl *encl, + struct __test_metadata *_metadata) { Elf64_Sym *sgx_enter_enclave_sym = NULL; struct vdso_symtab symtab; @@ -122,31 +144,25 @@ FIXTURE_SETUP(enclave) unsigned int i; void *addr; - if (!encl_load("test_encl.elf", &self->encl)) { - encl_delete(&self->encl); - ksft_exit_skip("cannot load enclaves\n"); + if (!encl_load("test_encl.elf", encl, heap_size)) { + encl_delete(encl); + TH_LOG("Failed to load the test enclave.\n"); } - for (i = 0; i < self->encl.nr_segments; i++) { - seg = &self->encl.segment_tbl[i]; - - TH_LOG("0x%016lx 0x%016lx 0x%02x", seg->offset, seg->size, seg->prot); - } - - if (!encl_measure(&self->encl)) + if (!encl_measure(encl)) goto err; - if (!encl_build(&self->encl)) + if (!encl_build(encl)) goto err; /* * An enclave consumer only must do this. */ - for (i = 0; i < self->encl.nr_segments; i++) { - struct encl_segment *seg = &self->encl.segment_tbl[i]; + for (i = 0; i < encl->nr_segments; i++) { + struct encl_segment *seg = &encl->segment_tbl[i]; - addr = mmap((void *)self->encl.encl_base + seg->offset, seg->size, - seg->prot, MAP_SHARED | MAP_FIXED, self->encl.fd, 0); + addr = mmap((void *)encl->encl_base + seg->offset, seg->size, + seg->prot, MAP_SHARED | MAP_FIXED, encl->fd, 0); EXPECT_NE(addr, MAP_FAILED); if (addr == MAP_FAILED) goto err; @@ -166,8 +182,16 @@ FIXTURE_SETUP(enclave) vdso_sgx_enter_enclave = addr + sgx_enter_enclave_sym->st_value; - memset(&self->run, 0, sizeof(self->run)); - self->run.tcs = self->encl.encl_base; + return true; + +err: + encl_delete(encl); + + for (i = 0; i < encl->nr_segments; i++) { + seg = &encl->segment_tbl[i]; + + TH_LOG("0x%016lx 0x%016lx 0x%02x", seg->offset, seg->size, seg->prot); + } maps_file = fopen("/proc/self/maps", "r"); if (maps_file != NULL) { @@ -181,11 +205,13 @@ FIXTURE_SETUP(enclave) fclose(maps_file); } -err: - if (!sgx_enter_enclave_sym) - encl_delete(&self->encl); + TH_LOG("Failed to initialize the test enclave.\n"); + + return false; +} - ASSERT_NE(sgx_enter_enclave_sym, NULL); +FIXTURE_SETUP(enclave) +{ } FIXTURE_TEARDOWN(enclave) @@ -215,44 +241,130 @@ FIXTURE_TEARDOWN(enclave) TEST_F(enclave, unclobbered_vdso) { - struct encl_op op; + struct encl_op_get_from_buf get_op; + struct encl_op_put_to_buf put_op; + + ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)); + + memset(&self->run, 0, sizeof(self->run)); + self->run.tcs = self->encl.encl_base; + + put_op.header.type = ENCL_OP_PUT_TO_BUFFER; + put_op.value = MAGIC; + + EXPECT_EQ(ENCL_CALL(&put_op, &self->run, false), 0); + + EXPECT_EEXIT(&self->run); + EXPECT_EQ(self->run.user_data, 0); + + get_op.header.type = ENCL_OP_GET_FROM_BUFFER; + get_op.value = 0; + + EXPECT_EQ(ENCL_CALL(&get_op, &self->run, false), 0); + + EXPECT_EQ(get_op.value, MAGIC); + EXPECT_EEXIT(&self->run); + EXPECT_EQ(self->run.user_data, 0); +} + +/* + * A section metric is concatenated in a way that @low bits 12-31 define the + * bits 12-31 of the metric and @high bits 0-19 define the bits 32-51 of the + * metric. + */ +static unsigned long sgx_calc_section_metric(unsigned int low, + unsigned int high) +{ + return (low & GENMASK_ULL(31, 12)) + + ((high & GENMASK_ULL(19, 0)) << 32); +} + +/* + * Sum total available physical SGX memory across all EPC sections + * + * Return: total available physical SGX memory available on system + */ +static unsigned long get_total_epc_mem(void) +{ + unsigned int eax, ebx, ecx, edx; + unsigned long total_size = 0; + unsigned int type; + int section = 0; + + while (true) { + __cpuid_count(SGX_CPUID, section + SGX_CPUID_EPC, eax, ebx, ecx, edx); + + type = eax & SGX_CPUID_EPC_MASK; + if (type == SGX_CPUID_EPC_INVALID) + break; - op.type = ENCL_OP_PUT; - op.buffer = MAGIC; + if (type != SGX_CPUID_EPC_SECTION) + break; - EXPECT_EQ(ENCL_CALL(&op, &self->run, false), 0); + total_size += sgx_calc_section_metric(ecx, edx); + + section++; + } + + return total_size; +} + +TEST_F(enclave, unclobbered_vdso_oversubscribed) +{ + struct encl_op_get_from_buf get_op; + struct encl_op_put_to_buf put_op; + unsigned long total_mem; + + total_mem = get_total_epc_mem(); + ASSERT_NE(total_mem, 0); + ASSERT_TRUE(setup_test_encl(total_mem, &self->encl, _metadata)); + + memset(&self->run, 0, sizeof(self->run)); + self->run.tcs = self->encl.encl_base; + + put_op.header.type = ENCL_OP_PUT_TO_BUFFER; + put_op.value = MAGIC; + + EXPECT_EQ(ENCL_CALL(&put_op, &self->run, false), 0); EXPECT_EEXIT(&self->run); EXPECT_EQ(self->run.user_data, 0); - op.type = ENCL_OP_GET; - op.buffer = 0; + get_op.header.type = ENCL_OP_GET_FROM_BUFFER; + get_op.value = 0; - EXPECT_EQ(ENCL_CALL(&op, &self->run, false), 0); + EXPECT_EQ(ENCL_CALL(&get_op, &self->run, false), 0); - EXPECT_EQ(op.buffer, MAGIC); + EXPECT_EQ(get_op.value, MAGIC); EXPECT_EEXIT(&self->run); EXPECT_EQ(self->run.user_data, 0); + } TEST_F(enclave, clobbered_vdso) { - struct encl_op op; + struct encl_op_get_from_buf get_op; + struct encl_op_put_to_buf put_op; - op.type = ENCL_OP_PUT; - op.buffer = MAGIC; + ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)); - EXPECT_EQ(ENCL_CALL(&op, &self->run, true), 0); + memset(&self->run, 0, sizeof(self->run)); + self->run.tcs = self->encl.encl_base; + + put_op.header.type = ENCL_OP_PUT_TO_BUFFER; + put_op.value = MAGIC; + + EXPECT_EQ(ENCL_CALL(&put_op, &self->run, true), 0); EXPECT_EEXIT(&self->run); EXPECT_EQ(self->run.user_data, 0); - op.type = ENCL_OP_GET; - op.buffer = 0; + get_op.header.type = ENCL_OP_GET_FROM_BUFFER; + get_op.value = 0; - EXPECT_EQ(ENCL_CALL(&op, &self->run, true), 0); + EXPECT_EQ(ENCL_CALL(&get_op, &self->run, true), 0); - EXPECT_EQ(op.buffer, MAGIC); + EXPECT_EQ(get_op.value, MAGIC); EXPECT_EEXIT(&self->run); EXPECT_EQ(self->run.user_data, 0); } @@ -267,27 +379,179 @@ static int test_handler(long rdi, long rsi, long rdx, long ursp, long r8, long r TEST_F(enclave, clobbered_vdso_and_user_function) { - struct encl_op op; + struct encl_op_get_from_buf get_op; + struct encl_op_put_to_buf put_op; + + ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)); + + memset(&self->run, 0, sizeof(self->run)); + self->run.tcs = self->encl.encl_base; self->run.user_handler = (__u64)test_handler; self->run.user_data = 0xdeadbeef; - op.type = ENCL_OP_PUT; - op.buffer = MAGIC; + put_op.header.type = ENCL_OP_PUT_TO_BUFFER; + put_op.value = MAGIC; - EXPECT_EQ(ENCL_CALL(&op, &self->run, true), 0); + EXPECT_EQ(ENCL_CALL(&put_op, &self->run, true), 0); EXPECT_EEXIT(&self->run); EXPECT_EQ(self->run.user_data, 0); - op.type = ENCL_OP_GET; - op.buffer = 0; + get_op.header.type = ENCL_OP_GET_FROM_BUFFER; + get_op.value = 0; - EXPECT_EQ(ENCL_CALL(&op, &self->run, true), 0); + EXPECT_EQ(ENCL_CALL(&get_op, &self->run, true), 0); - EXPECT_EQ(op.buffer, MAGIC); + EXPECT_EQ(get_op.value, MAGIC); EXPECT_EEXIT(&self->run); EXPECT_EQ(self->run.user_data, 0); } +/* + * Sanity check that it is possible to enter either of the two hardcoded TCS + */ +TEST_F(enclave, tcs_entry) +{ + struct encl_op_header op; + + ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)); + + memset(&self->run, 0, sizeof(self->run)); + self->run.tcs = self->encl.encl_base; + + op.type = ENCL_OP_NOP; + + EXPECT_EQ(ENCL_CALL(&op, &self->run, true), 0); + + EXPECT_EEXIT(&self->run); + EXPECT_EQ(self->run.exception_vector, 0); + EXPECT_EQ(self->run.exception_error_code, 0); + EXPECT_EQ(self->run.exception_addr, 0); + + /* Move to the next TCS. */ + self->run.tcs = self->encl.encl_base + PAGE_SIZE; + + EXPECT_EQ(ENCL_CALL(&op, &self->run, true), 0); + + EXPECT_EEXIT(&self->run); + EXPECT_EQ(self->run.exception_vector, 0); + EXPECT_EQ(self->run.exception_error_code, 0); + EXPECT_EQ(self->run.exception_addr, 0); +} + +/* + * Second page of .data segment is used to test changing PTE permissions. + * This spans the local encl_buffer within the test enclave. + * + * 1) Start with a sanity check: a value is written to the target page within + * the enclave and read back to ensure target page can be written to. + * 2) Change PTE permissions (RW -> RO) of target page within enclave. + * 3) Repeat (1) - this time expecting a regular #PF communicated via the + * vDSO. + * 4) Change PTE permissions of target page within enclave back to be RW. + * 5) Repeat (1) by resuming enclave, now expected to be possible to write to + * and read from target page within enclave. + */ +TEST_F(enclave, pte_permissions) +{ + struct encl_op_get_from_addr get_addr_op; + struct encl_op_put_to_addr put_addr_op; + unsigned long data_start; + int ret; + + ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)); + + memset(&self->run, 0, sizeof(self->run)); + self->run.tcs = self->encl.encl_base; + + data_start = self->encl.encl_base + + encl_get_data_offset(&self->encl) + + PAGE_SIZE; + + /* + * Sanity check to ensure it is possible to write to page that will + * have its permissions manipulated. + */ + + /* Write MAGIC to page */ + put_addr_op.value = MAGIC; + put_addr_op.addr = data_start; + put_addr_op.header.type = ENCL_OP_PUT_TO_ADDRESS; + + EXPECT_EQ(ENCL_CALL(&put_addr_op, &self->run, true), 0); + + EXPECT_EEXIT(&self->run); + EXPECT_EQ(self->run.exception_vector, 0); + EXPECT_EQ(self->run.exception_error_code, 0); + EXPECT_EQ(self->run.exception_addr, 0); + + /* + * Read memory that was just written to, confirming that it is the + * value previously written (MAGIC). + */ + get_addr_op.value = 0; + get_addr_op.addr = data_start; + get_addr_op.header.type = ENCL_OP_GET_FROM_ADDRESS; + + EXPECT_EQ(ENCL_CALL(&get_addr_op, &self->run, true), 0); + + EXPECT_EQ(get_addr_op.value, MAGIC); + EXPECT_EEXIT(&self->run); + EXPECT_EQ(self->run.exception_vector, 0); + EXPECT_EQ(self->run.exception_error_code, 0); + EXPECT_EQ(self->run.exception_addr, 0); + + /* Change PTE permissions of target page within the enclave */ + ret = mprotect((void *)data_start, PAGE_SIZE, PROT_READ); + if (ret) + perror("mprotect"); + + /* + * PTE permissions of target page changed to read-only, EPCM + * permissions unchanged (EPCM permissions are RW), attempt to + * write to the page, expecting a regular #PF. + */ + + put_addr_op.value = MAGIC2; + + EXPECT_EQ(ENCL_CALL(&put_addr_op, &self->run, true), 0); + + EXPECT_EQ(self->run.exception_vector, 14); + EXPECT_EQ(self->run.exception_error_code, 0x7); + EXPECT_EQ(self->run.exception_addr, data_start); + + self->run.exception_vector = 0; + self->run.exception_error_code = 0; + self->run.exception_addr = 0; + + /* + * Change PTE permissions back to enable enclave to write to the + * target page and resume enclave - do not expect any exceptions this + * time. + */ + ret = mprotect((void *)data_start, PAGE_SIZE, PROT_READ | PROT_WRITE); + if (ret) + perror("mprotect"); + + EXPECT_EQ(vdso_sgx_enter_enclave((unsigned long)&put_addr_op, 0, + 0, ERESUME, 0, 0, &self->run), + 0); + + EXPECT_EEXIT(&self->run); + EXPECT_EQ(self->run.exception_vector, 0); + EXPECT_EQ(self->run.exception_error_code, 0); + EXPECT_EQ(self->run.exception_addr, 0); + + get_addr_op.value = 0; + + EXPECT_EQ(ENCL_CALL(&get_addr_op, &self->run, true), 0); + + EXPECT_EQ(get_addr_op.value, MAGIC2); + EXPECT_EEXIT(&self->run); + EXPECT_EQ(self->run.exception_vector, 0); + EXPECT_EQ(self->run.exception_error_code, 0); + EXPECT_EQ(self->run.exception_addr, 0); +} + TEST_HARNESS_MAIN |