1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* Copyright(c) 2016-20 Intel Corporation. */ |
3 | |
4 | #include <cpuid.h> |
5 | #include <elf.h> |
6 | #include <errno.h> |
7 | #include <fcntl.h> |
8 | #include <stdbool.h> |
9 | #include <stdio.h> |
10 | #include <stdint.h> |
11 | #include <stdlib.h> |
12 | #include <string.h> |
13 | #include <unistd.h> |
14 | #include <sys/ioctl.h> |
15 | #include <sys/mman.h> |
16 | #include <sys/stat.h> |
17 | #include <sys/time.h> |
18 | #include <sys/types.h> |
19 | #include <sys/auxv.h> |
20 | #include "defines.h" |
21 | #include "../kselftest_harness.h" |
22 | #include "main.h" |
23 | |
24 | static const uint64_t MAGIC = 0x1122334455667788ULL; |
25 | static const uint64_t MAGIC2 = 0x8877665544332211ULL; |
26 | vdso_sgx_enter_enclave_t vdso_sgx_enter_enclave; |
27 | |
28 | /* |
29 | * Security Information (SECINFO) data structure needed by a few SGX |
30 | * instructions (eg. ENCLU[EACCEPT] and ENCLU[EMODPE]) holds meta-data |
31 | * about an enclave page. &enum sgx_secinfo_page_state specifies the |
32 | * secinfo flags used for page state. |
33 | */ |
34 | enum sgx_secinfo_page_state { |
35 | SGX_SECINFO_PENDING = (1 << 3), |
36 | SGX_SECINFO_MODIFIED = (1 << 4), |
37 | SGX_SECINFO_PR = (1 << 5), |
38 | }; |
39 | |
40 | struct vdso_symtab { |
41 | Elf64_Sym *elf_symtab; |
42 | const char *elf_symstrtab; |
43 | Elf64_Word *elf_hashtab; |
44 | }; |
45 | |
46 | static Elf64_Dyn *vdso_get_dyntab(void *addr) |
47 | { |
48 | Elf64_Ehdr *ehdr = addr; |
49 | Elf64_Phdr *phdrtab = addr + ehdr->e_phoff; |
50 | int i; |
51 | |
52 | for (i = 0; i < ehdr->e_phnum; i++) |
53 | if (phdrtab[i].p_type == PT_DYNAMIC) |
54 | return addr + phdrtab[i].p_offset; |
55 | |
56 | return NULL; |
57 | } |
58 | |
59 | static void *vdso_get_dyn(void *addr, Elf64_Dyn *dyntab, Elf64_Sxword tag) |
60 | { |
61 | int i; |
62 | |
63 | for (i = 0; dyntab[i].d_tag != DT_NULL; i++) |
64 | if (dyntab[i].d_tag == tag) |
65 | return addr + dyntab[i].d_un.d_ptr; |
66 | |
67 | return NULL; |
68 | } |
69 | |
70 | static bool vdso_get_symtab(void *addr, struct vdso_symtab *symtab) |
71 | { |
72 | Elf64_Dyn *dyntab = vdso_get_dyntab(addr); |
73 | |
74 | symtab->elf_symtab = vdso_get_dyn(addr, dyntab, DT_SYMTAB); |
75 | if (!symtab->elf_symtab) |
76 | return false; |
77 | |
78 | symtab->elf_symstrtab = vdso_get_dyn(addr, dyntab, DT_STRTAB); |
79 | if (!symtab->elf_symstrtab) |
80 | return false; |
81 | |
82 | symtab->elf_hashtab = vdso_get_dyn(addr, dyntab, DT_HASH); |
83 | if (!symtab->elf_hashtab) |
84 | return false; |
85 | |
86 | return true; |
87 | } |
88 | |
89 | static inline int sgx2_supported(void) |
90 | { |
91 | unsigned int eax, ebx, ecx, edx; |
92 | |
93 | __cpuid_count(SGX_CPUID, 0x0, eax, ebx, ecx, edx); |
94 | |
95 | return eax & 0x2; |
96 | } |
97 | |
98 | static unsigned long elf_sym_hash(const char *name) |
99 | { |
100 | unsigned long h = 0, high; |
101 | |
102 | while (*name) { |
103 | h = (h << 4) + *name++; |
104 | high = h & 0xf0000000; |
105 | |
106 | if (high) |
107 | h ^= high >> 24; |
108 | |
109 | h &= ~high; |
110 | } |
111 | |
112 | return h; |
113 | } |
114 | |
115 | static Elf64_Sym *vdso_symtab_get(struct vdso_symtab *symtab, const char *name) |
116 | { |
117 | Elf64_Word bucketnum = symtab->elf_hashtab[0]; |
118 | Elf64_Word *buckettab = &symtab->elf_hashtab[2]; |
119 | Elf64_Word *chaintab = &symtab->elf_hashtab[2 + bucketnum]; |
120 | Elf64_Sym *sym; |
121 | Elf64_Word i; |
122 | |
123 | for (i = buckettab[elf_sym_hash(name) % bucketnum]; i != STN_UNDEF; |
124 | i = chaintab[i]) { |
125 | sym = &symtab->elf_symtab[i]; |
126 | if (!strcmp(name, &symtab->elf_symstrtab[sym->st_name])) |
127 | return sym; |
128 | } |
129 | |
130 | return NULL; |
131 | } |
132 | |
133 | /* |
134 | * Return the offset in the enclave where the TCS segment can be found. |
135 | * The first RW segment loaded is the TCS. |
136 | */ |
137 | static off_t encl_get_tcs_offset(struct encl *encl) |
138 | { |
139 | int i; |
140 | |
141 | for (i = 0; i < encl->nr_segments; i++) { |
142 | struct encl_segment *seg = &encl->segment_tbl[i]; |
143 | |
144 | if (i == 0 && seg->prot == (PROT_READ | PROT_WRITE)) |
145 | return seg->offset; |
146 | } |
147 | |
148 | return -1; |
149 | } |
150 | |
151 | /* |
152 | * Return the offset in the enclave where the data segment can be found. |
153 | * The first RW segment loaded is the TCS, skip that to get info on the |
154 | * data segment. |
155 | */ |
156 | static off_t encl_get_data_offset(struct encl *encl) |
157 | { |
158 | int i; |
159 | |
160 | for (i = 1; i < encl->nr_segments; i++) { |
161 | struct encl_segment *seg = &encl->segment_tbl[i]; |
162 | |
163 | if (seg->prot == (PROT_READ | PROT_WRITE)) |
164 | return seg->offset; |
165 | } |
166 | |
167 | return -1; |
168 | } |
169 | |
170 | FIXTURE(enclave) { |
171 | struct encl encl; |
172 | struct sgx_enclave_run run; |
173 | }; |
174 | |
175 | static bool setup_test_encl(unsigned long heap_size, struct encl *encl, |
176 | struct __test_metadata *_metadata) |
177 | { |
178 | Elf64_Sym *sgx_enter_enclave_sym = NULL; |
179 | struct vdso_symtab symtab; |
180 | struct encl_segment *seg; |
181 | char maps_line[256]; |
182 | FILE *maps_file; |
183 | unsigned int i; |
184 | void *addr; |
185 | |
186 | if (!encl_load(path: "test_encl.elf" , encl, heap_size)) { |
187 | encl_delete(ctx: encl); |
188 | TH_LOG("Failed to load the test enclave." ); |
189 | return false; |
190 | } |
191 | |
192 | if (!encl_measure(encl)) |
193 | goto err; |
194 | |
195 | if (!encl_build(encl)) |
196 | goto err; |
197 | |
198 | /* |
199 | * An enclave consumer only must do this. |
200 | */ |
201 | for (i = 0; i < encl->nr_segments; i++) { |
202 | struct encl_segment *seg = &encl->segment_tbl[i]; |
203 | |
204 | addr = mmap((void *)encl->encl_base + seg->offset, seg->size, |
205 | seg->prot, MAP_SHARED | MAP_FIXED, encl->fd, 0); |
206 | EXPECT_NE(addr, MAP_FAILED); |
207 | if (addr == MAP_FAILED) |
208 | goto err; |
209 | } |
210 | |
211 | /* Get vDSO base address */ |
212 | addr = (void *)getauxval(AT_SYSINFO_EHDR); |
213 | if (!addr) |
214 | goto err; |
215 | |
216 | if (!vdso_get_symtab(addr, symtab: &symtab)) |
217 | goto err; |
218 | |
219 | sgx_enter_enclave_sym = vdso_symtab_get(&symtab, "__vdso_sgx_enter_enclave" ); |
220 | if (!sgx_enter_enclave_sym) |
221 | goto err; |
222 | |
223 | vdso_sgx_enter_enclave = addr + sgx_enter_enclave_sym->st_value; |
224 | |
225 | return true; |
226 | |
227 | err: |
228 | for (i = 0; i < encl->nr_segments; i++) { |
229 | seg = &encl->segment_tbl[i]; |
230 | |
231 | TH_LOG("0x%016lx 0x%016lx 0x%02x" , seg->offset, seg->size, seg->prot); |
232 | } |
233 | |
234 | maps_file = fopen("/proc/self/maps" , "r" ); |
235 | if (maps_file != NULL) { |
236 | while (fgets(maps_line, sizeof(maps_line), maps_file) != NULL) { |
237 | maps_line[strlen(maps_line) - 1] = '\0'; |
238 | |
239 | if (strstr(maps_line, "/dev/sgx_enclave" )) |
240 | TH_LOG("%s" , maps_line); |
241 | } |
242 | |
243 | fclose(maps_file); |
244 | } |
245 | |
246 | TH_LOG("Failed to initialize the test enclave." ); |
247 | |
248 | encl_delete(ctx: encl); |
249 | |
250 | return false; |
251 | } |
252 | |
253 | FIXTURE_SETUP(enclave) |
254 | { |
255 | } |
256 | |
257 | FIXTURE_TEARDOWN(enclave) |
258 | { |
259 | encl_delete(ctx: &self->encl); |
260 | } |
261 | |
262 | #define ENCL_CALL(op, run, clobbered) \ |
263 | ({ \ |
264 | int ret; \ |
265 | if ((clobbered)) \ |
266 | ret = vdso_sgx_enter_enclave((unsigned long)(op), 0, 0, \ |
267 | EENTER, 0, 0, (run)); \ |
268 | else \ |
269 | ret = sgx_enter_enclave((void *)(op), NULL, 0, EENTER, NULL, NULL, \ |
270 | (run)); \ |
271 | ret; \ |
272 | }) |
273 | |
274 | #define EXPECT_EEXIT(run) \ |
275 | do { \ |
276 | EXPECT_EQ((run)->function, EEXIT); \ |
277 | if ((run)->function != EEXIT) \ |
278 | TH_LOG("0x%02x 0x%02x 0x%016llx", (run)->exception_vector, \ |
279 | (run)->exception_error_code, (run)->exception_addr); \ |
280 | } while (0) |
281 | |
282 | TEST_F(enclave, unclobbered_vdso) |
283 | { |
284 | struct encl_op_get_from_buf get_op; |
285 | struct encl_op_put_to_buf put_op; |
286 | |
287 | ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)); |
288 | |
289 | memset(&self->run, 0, sizeof(self->run)); |
290 | self->run.tcs = self->encl.encl_base; |
291 | |
292 | put_op.header.type = ENCL_OP_PUT_TO_BUFFER; |
293 | put_op.value = MAGIC; |
294 | |
295 | EXPECT_EQ(ENCL_CALL(&put_op, &self->run, false), 0); |
296 | |
297 | EXPECT_EEXIT(&self->run); |
298 | EXPECT_EQ(self->run.user_data, 0); |
299 | |
300 | get_op.header.type = ENCL_OP_GET_FROM_BUFFER; |
301 | get_op.value = 0; |
302 | |
303 | EXPECT_EQ(ENCL_CALL(&get_op, &self->run, false), 0); |
304 | |
305 | EXPECT_EQ(get_op.value, MAGIC); |
306 | EXPECT_EEXIT(&self->run); |
307 | EXPECT_EQ(self->run.user_data, 0); |
308 | } |
309 | |
310 | /* |
311 | * A section metric is concatenated in a way that @low bits 12-31 define the |
312 | * bits 12-31 of the metric and @high bits 0-19 define the bits 32-51 of the |
313 | * metric. |
314 | */ |
315 | static unsigned long sgx_calc_section_metric(unsigned int low, |
316 | unsigned int high) |
317 | { |
318 | return (low & GENMASK_ULL(31, 12)) + |
319 | ((high & GENMASK_ULL(19, 0)) << 32); |
320 | } |
321 | |
322 | /* |
323 | * Sum total available physical SGX memory across all EPC sections |
324 | * |
325 | * Return: total available physical SGX memory available on system |
326 | */ |
327 | static unsigned long get_total_epc_mem(void) |
328 | { |
329 | unsigned int eax, ebx, ecx, edx; |
330 | unsigned long total_size = 0; |
331 | unsigned int type; |
332 | int section = 0; |
333 | |
334 | while (true) { |
335 | __cpuid_count(SGX_CPUID, section + SGX_CPUID_EPC, eax, ebx, ecx, edx); |
336 | |
337 | type = eax & SGX_CPUID_EPC_MASK; |
338 | if (type == SGX_CPUID_EPC_INVALID) |
339 | break; |
340 | |
341 | if (type != SGX_CPUID_EPC_SECTION) |
342 | break; |
343 | |
344 | total_size += sgx_calc_section_metric(low: ecx, high: edx); |
345 | |
346 | section++; |
347 | } |
348 | |
349 | return total_size; |
350 | } |
351 | |
352 | TEST_F(enclave, unclobbered_vdso_oversubscribed) |
353 | { |
354 | struct encl_op_get_from_buf get_op; |
355 | struct encl_op_put_to_buf put_op; |
356 | unsigned long total_mem; |
357 | |
358 | total_mem = get_total_epc_mem(); |
359 | ASSERT_NE(total_mem, 0); |
360 | ASSERT_TRUE(setup_test_encl(total_mem, &self->encl, _metadata)); |
361 | |
362 | memset(&self->run, 0, sizeof(self->run)); |
363 | self->run.tcs = self->encl.encl_base; |
364 | |
365 | put_op.header.type = ENCL_OP_PUT_TO_BUFFER; |
366 | put_op.value = MAGIC; |
367 | |
368 | EXPECT_EQ(ENCL_CALL(&put_op, &self->run, false), 0); |
369 | |
370 | EXPECT_EEXIT(&self->run); |
371 | EXPECT_EQ(self->run.user_data, 0); |
372 | |
373 | get_op.header.type = ENCL_OP_GET_FROM_BUFFER; |
374 | get_op.value = 0; |
375 | |
376 | EXPECT_EQ(ENCL_CALL(&get_op, &self->run, false), 0); |
377 | |
378 | EXPECT_EQ(get_op.value, MAGIC); |
379 | EXPECT_EEXIT(&self->run); |
380 | EXPECT_EQ(self->run.user_data, 0); |
381 | } |
382 | |
383 | TEST_F_TIMEOUT(enclave, unclobbered_vdso_oversubscribed_remove, 900) |
384 | { |
385 | struct sgx_enclave_remove_pages remove_ioc; |
386 | struct sgx_enclave_modify_types modt_ioc; |
387 | struct encl_op_get_from_buf get_op; |
388 | struct encl_op_eaccept eaccept_op; |
389 | struct encl_op_put_to_buf put_op; |
390 | struct encl_segment *heap; |
391 | unsigned long total_mem; |
392 | int ret, errno_save; |
393 | unsigned long addr; |
394 | unsigned long i; |
395 | |
396 | /* |
397 | * Create enclave with additional heap that is as big as all |
398 | * available physical SGX memory. |
399 | */ |
400 | total_mem = get_total_epc_mem(); |
401 | ASSERT_NE(total_mem, 0); |
402 | TH_LOG("Creating an enclave with %lu bytes heap may take a while ..." , |
403 | total_mem); |
404 | ASSERT_TRUE(setup_test_encl(total_mem, &self->encl, _metadata)); |
405 | |
406 | /* |
407 | * Hardware (SGX2) and kernel support is needed for this test. Start |
408 | * with check that test has a chance of succeeding. |
409 | */ |
410 | memset(&modt_ioc, 0, sizeof(modt_ioc)); |
411 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_MODIFY_TYPES, &modt_ioc); |
412 | |
413 | if (ret == -1) { |
414 | if (errno == ENOTTY) |
415 | SKIP(return, |
416 | "Kernel does not support SGX_IOC_ENCLAVE_MODIFY_TYPES ioctl()" ); |
417 | else if (errno == ENODEV) |
418 | SKIP(return, "System does not support SGX2" ); |
419 | } |
420 | |
421 | /* |
422 | * Invalid parameters were provided during sanity check, |
423 | * expect command to fail. |
424 | */ |
425 | EXPECT_EQ(ret, -1); |
426 | |
427 | /* SGX2 is supported by kernel and hardware, test can proceed. */ |
428 | memset(&self->run, 0, sizeof(self->run)); |
429 | self->run.tcs = self->encl.encl_base; |
430 | |
431 | heap = &self->encl.segment_tbl[self->encl.nr_segments - 1]; |
432 | |
433 | put_op.header.type = ENCL_OP_PUT_TO_BUFFER; |
434 | put_op.value = MAGIC; |
435 | |
436 | EXPECT_EQ(ENCL_CALL(&put_op, &self->run, false), 0); |
437 | |
438 | EXPECT_EEXIT(&self->run); |
439 | EXPECT_EQ(self->run.user_data, 0); |
440 | |
441 | get_op.header.type = ENCL_OP_GET_FROM_BUFFER; |
442 | get_op.value = 0; |
443 | |
444 | EXPECT_EQ(ENCL_CALL(&get_op, &self->run, false), 0); |
445 | |
446 | EXPECT_EQ(get_op.value, MAGIC); |
447 | EXPECT_EEXIT(&self->run); |
448 | EXPECT_EQ(self->run.user_data, 0); |
449 | |
450 | /* Trim entire heap. */ |
451 | memset(&modt_ioc, 0, sizeof(modt_ioc)); |
452 | |
453 | modt_ioc.offset = heap->offset; |
454 | modt_ioc.length = heap->size; |
455 | modt_ioc.page_type = SGX_PAGE_TYPE_TRIM; |
456 | |
457 | TH_LOG("Changing type of %zd bytes to trimmed may take a while ..." , |
458 | heap->size); |
459 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_MODIFY_TYPES, &modt_ioc); |
460 | errno_save = ret == -1 ? errno : 0; |
461 | |
462 | EXPECT_EQ(ret, 0); |
463 | EXPECT_EQ(errno_save, 0); |
464 | EXPECT_EQ(modt_ioc.result, 0); |
465 | EXPECT_EQ(modt_ioc.count, heap->size); |
466 | |
467 | /* EACCEPT all removed pages. */ |
468 | addr = self->encl.encl_base + heap->offset; |
469 | |
470 | eaccept_op.flags = SGX_SECINFO_TRIM | SGX_SECINFO_MODIFIED; |
471 | eaccept_op.header.type = ENCL_OP_EACCEPT; |
472 | |
473 | TH_LOG("Entering enclave to run EACCEPT for each page of %zd bytes may take a while ..." , |
474 | heap->size); |
475 | for (i = 0; i < heap->size; i += 4096) { |
476 | eaccept_op.epc_addr = addr + i; |
477 | eaccept_op.ret = 0; |
478 | |
479 | EXPECT_EQ(ENCL_CALL(&eaccept_op, &self->run, true), 0); |
480 | |
481 | EXPECT_EQ(self->run.exception_vector, 0); |
482 | EXPECT_EQ(self->run.exception_error_code, 0); |
483 | EXPECT_EQ(self->run.exception_addr, 0); |
484 | ASSERT_EQ(eaccept_op.ret, 0); |
485 | ASSERT_EQ(self->run.function, EEXIT); |
486 | } |
487 | |
488 | /* Complete page removal. */ |
489 | memset(&remove_ioc, 0, sizeof(remove_ioc)); |
490 | |
491 | remove_ioc.offset = heap->offset; |
492 | remove_ioc.length = heap->size; |
493 | |
494 | TH_LOG("Removing %zd bytes from enclave may take a while ..." , |
495 | heap->size); |
496 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_REMOVE_PAGES, &remove_ioc); |
497 | errno_save = ret == -1 ? errno : 0; |
498 | |
499 | EXPECT_EQ(ret, 0); |
500 | EXPECT_EQ(errno_save, 0); |
501 | EXPECT_EQ(remove_ioc.count, heap->size); |
502 | } |
503 | |
504 | TEST_F(enclave, clobbered_vdso) |
505 | { |
506 | struct encl_op_get_from_buf get_op; |
507 | struct encl_op_put_to_buf put_op; |
508 | |
509 | ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)); |
510 | |
511 | memset(&self->run, 0, sizeof(self->run)); |
512 | self->run.tcs = self->encl.encl_base; |
513 | |
514 | put_op.header.type = ENCL_OP_PUT_TO_BUFFER; |
515 | put_op.value = MAGIC; |
516 | |
517 | EXPECT_EQ(ENCL_CALL(&put_op, &self->run, true), 0); |
518 | |
519 | EXPECT_EEXIT(&self->run); |
520 | EXPECT_EQ(self->run.user_data, 0); |
521 | |
522 | get_op.header.type = ENCL_OP_GET_FROM_BUFFER; |
523 | get_op.value = 0; |
524 | |
525 | EXPECT_EQ(ENCL_CALL(&get_op, &self->run, true), 0); |
526 | |
527 | EXPECT_EQ(get_op.value, MAGIC); |
528 | EXPECT_EEXIT(&self->run); |
529 | EXPECT_EQ(self->run.user_data, 0); |
530 | } |
531 | |
532 | static int test_handler(long rdi, long rsi, long rdx, long ursp, long r8, long r9, |
533 | struct sgx_enclave_run *run) |
534 | { |
535 | run->user_data = 0; |
536 | |
537 | return 0; |
538 | } |
539 | |
540 | TEST_F(enclave, clobbered_vdso_and_user_function) |
541 | { |
542 | struct encl_op_get_from_buf get_op; |
543 | struct encl_op_put_to_buf put_op; |
544 | |
545 | ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)); |
546 | |
547 | memset(&self->run, 0, sizeof(self->run)); |
548 | self->run.tcs = self->encl.encl_base; |
549 | |
550 | self->run.user_handler = (__u64)test_handler; |
551 | self->run.user_data = 0xdeadbeef; |
552 | |
553 | put_op.header.type = ENCL_OP_PUT_TO_BUFFER; |
554 | put_op.value = MAGIC; |
555 | |
556 | EXPECT_EQ(ENCL_CALL(&put_op, &self->run, true), 0); |
557 | |
558 | EXPECT_EEXIT(&self->run); |
559 | EXPECT_EQ(self->run.user_data, 0); |
560 | |
561 | get_op.header.type = ENCL_OP_GET_FROM_BUFFER; |
562 | get_op.value = 0; |
563 | |
564 | EXPECT_EQ(ENCL_CALL(&get_op, &self->run, true), 0); |
565 | |
566 | EXPECT_EQ(get_op.value, MAGIC); |
567 | EXPECT_EEXIT(&self->run); |
568 | EXPECT_EQ(self->run.user_data, 0); |
569 | } |
570 | |
571 | /* |
572 | * Sanity check that it is possible to enter either of the two hardcoded TCS |
573 | */ |
574 | TEST_F(enclave, tcs_entry) |
575 | { |
576 | struct encl_op_header op; |
577 | |
578 | ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)); |
579 | |
580 | memset(&self->run, 0, sizeof(self->run)); |
581 | self->run.tcs = self->encl.encl_base; |
582 | |
583 | op.type = ENCL_OP_NOP; |
584 | |
585 | EXPECT_EQ(ENCL_CALL(&op, &self->run, true), 0); |
586 | |
587 | EXPECT_EEXIT(&self->run); |
588 | EXPECT_EQ(self->run.exception_vector, 0); |
589 | EXPECT_EQ(self->run.exception_error_code, 0); |
590 | EXPECT_EQ(self->run.exception_addr, 0); |
591 | |
592 | /* Move to the next TCS. */ |
593 | self->run.tcs = self->encl.encl_base + PAGE_SIZE; |
594 | |
595 | EXPECT_EQ(ENCL_CALL(&op, &self->run, true), 0); |
596 | |
597 | EXPECT_EEXIT(&self->run); |
598 | EXPECT_EQ(self->run.exception_vector, 0); |
599 | EXPECT_EQ(self->run.exception_error_code, 0); |
600 | EXPECT_EQ(self->run.exception_addr, 0); |
601 | } |
602 | |
603 | /* |
604 | * Second page of .data segment is used to test changing PTE permissions. |
605 | * This spans the local encl_buffer within the test enclave. |
606 | * |
607 | * 1) Start with a sanity check: a value is written to the target page within |
608 | * the enclave and read back to ensure target page can be written to. |
609 | * 2) Change PTE permissions (RW -> RO) of target page within enclave. |
610 | * 3) Repeat (1) - this time expecting a regular #PF communicated via the |
611 | * vDSO. |
612 | * 4) Change PTE permissions of target page within enclave back to be RW. |
613 | * 5) Repeat (1) by resuming enclave, now expected to be possible to write to |
614 | * and read from target page within enclave. |
615 | */ |
616 | TEST_F(enclave, pte_permissions) |
617 | { |
618 | struct encl_op_get_from_addr get_addr_op; |
619 | struct encl_op_put_to_addr put_addr_op; |
620 | unsigned long data_start; |
621 | int ret; |
622 | |
623 | ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)); |
624 | |
625 | memset(&self->run, 0, sizeof(self->run)); |
626 | self->run.tcs = self->encl.encl_base; |
627 | |
628 | data_start = self->encl.encl_base + |
629 | encl_get_data_offset(encl: &self->encl) + |
630 | PAGE_SIZE; |
631 | |
632 | /* |
633 | * Sanity check to ensure it is possible to write to page that will |
634 | * have its permissions manipulated. |
635 | */ |
636 | |
637 | /* Write MAGIC to page */ |
638 | put_addr_op.value = MAGIC; |
639 | put_addr_op.addr = data_start; |
640 | put_addr_op.header.type = ENCL_OP_PUT_TO_ADDRESS; |
641 | |
642 | EXPECT_EQ(ENCL_CALL(&put_addr_op, &self->run, true), 0); |
643 | |
644 | EXPECT_EEXIT(&self->run); |
645 | EXPECT_EQ(self->run.exception_vector, 0); |
646 | EXPECT_EQ(self->run.exception_error_code, 0); |
647 | EXPECT_EQ(self->run.exception_addr, 0); |
648 | |
649 | /* |
650 | * Read memory that was just written to, confirming that it is the |
651 | * value previously written (MAGIC). |
652 | */ |
653 | get_addr_op.value = 0; |
654 | get_addr_op.addr = data_start; |
655 | get_addr_op.header.type = ENCL_OP_GET_FROM_ADDRESS; |
656 | |
657 | EXPECT_EQ(ENCL_CALL(&get_addr_op, &self->run, true), 0); |
658 | |
659 | EXPECT_EQ(get_addr_op.value, MAGIC); |
660 | EXPECT_EEXIT(&self->run); |
661 | EXPECT_EQ(self->run.exception_vector, 0); |
662 | EXPECT_EQ(self->run.exception_error_code, 0); |
663 | EXPECT_EQ(self->run.exception_addr, 0); |
664 | |
665 | /* Change PTE permissions of target page within the enclave */ |
666 | ret = mprotect((void *)data_start, PAGE_SIZE, PROT_READ); |
667 | if (ret) |
668 | perror("mprotect" ); |
669 | |
670 | /* |
671 | * PTE permissions of target page changed to read-only, EPCM |
672 | * permissions unchanged (EPCM permissions are RW), attempt to |
673 | * write to the page, expecting a regular #PF. |
674 | */ |
675 | |
676 | put_addr_op.value = MAGIC2; |
677 | |
678 | EXPECT_EQ(ENCL_CALL(&put_addr_op, &self->run, true), 0); |
679 | |
680 | EXPECT_EQ(self->run.exception_vector, 14); |
681 | EXPECT_EQ(self->run.exception_error_code, 0x7); |
682 | EXPECT_EQ(self->run.exception_addr, data_start); |
683 | |
684 | self->run.exception_vector = 0; |
685 | self->run.exception_error_code = 0; |
686 | self->run.exception_addr = 0; |
687 | |
688 | /* |
689 | * Change PTE permissions back to enable enclave to write to the |
690 | * target page and resume enclave - do not expect any exceptions this |
691 | * time. |
692 | */ |
693 | ret = mprotect((void *)data_start, PAGE_SIZE, PROT_READ | PROT_WRITE); |
694 | if (ret) |
695 | perror("mprotect" ); |
696 | |
697 | EXPECT_EQ(vdso_sgx_enter_enclave((unsigned long)&put_addr_op, 0, |
698 | 0, ERESUME, 0, 0, &self->run), |
699 | 0); |
700 | |
701 | EXPECT_EEXIT(&self->run); |
702 | EXPECT_EQ(self->run.exception_vector, 0); |
703 | EXPECT_EQ(self->run.exception_error_code, 0); |
704 | EXPECT_EQ(self->run.exception_addr, 0); |
705 | |
706 | get_addr_op.value = 0; |
707 | |
708 | EXPECT_EQ(ENCL_CALL(&get_addr_op, &self->run, true), 0); |
709 | |
710 | EXPECT_EQ(get_addr_op.value, MAGIC2); |
711 | EXPECT_EEXIT(&self->run); |
712 | EXPECT_EQ(self->run.exception_vector, 0); |
713 | EXPECT_EQ(self->run.exception_error_code, 0); |
714 | EXPECT_EQ(self->run.exception_addr, 0); |
715 | } |
716 | |
717 | /* |
718 | * Modifying permissions of TCS page should not be possible. |
719 | */ |
720 | TEST_F(enclave, tcs_permissions) |
721 | { |
722 | struct sgx_enclave_restrict_permissions ioc; |
723 | int ret, errno_save; |
724 | |
725 | ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)); |
726 | |
727 | memset(&self->run, 0, sizeof(self->run)); |
728 | self->run.tcs = self->encl.encl_base; |
729 | |
730 | memset(&ioc, 0, sizeof(ioc)); |
731 | |
732 | /* |
733 | * Ensure kernel supports needed ioctl() and system supports needed |
734 | * commands. |
735 | */ |
736 | |
737 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_RESTRICT_PERMISSIONS, &ioc); |
738 | errno_save = ret == -1 ? errno : 0; |
739 | |
740 | /* |
741 | * Invalid parameters were provided during sanity check, |
742 | * expect command to fail. |
743 | */ |
744 | ASSERT_EQ(ret, -1); |
745 | |
746 | /* ret == -1 */ |
747 | if (errno_save == ENOTTY) |
748 | SKIP(return, |
749 | "Kernel does not support SGX_IOC_ENCLAVE_RESTRICT_PERMISSIONS ioctl()" ); |
750 | else if (errno_save == ENODEV) |
751 | SKIP(return, "System does not support SGX2" ); |
752 | |
753 | /* |
754 | * Attempt to make TCS page read-only. This is not allowed and |
755 | * should be prevented by the kernel. |
756 | */ |
757 | ioc.offset = encl_get_tcs_offset(encl: &self->encl); |
758 | ioc.length = PAGE_SIZE; |
759 | ioc.permissions = SGX_SECINFO_R; |
760 | |
761 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_RESTRICT_PERMISSIONS, &ioc); |
762 | errno_save = ret == -1 ? errno : 0; |
763 | |
764 | EXPECT_EQ(ret, -1); |
765 | EXPECT_EQ(errno_save, EINVAL); |
766 | EXPECT_EQ(ioc.result, 0); |
767 | EXPECT_EQ(ioc.count, 0); |
768 | } |
769 | |
770 | /* |
771 | * Enclave page permission test. |
772 | * |
773 | * Modify and restore enclave page's EPCM (enclave) permissions from |
774 | * outside enclave (ENCLS[EMODPR] via kernel) as well as from within |
775 | * enclave (via ENCLU[EMODPE]). Check for page fault if |
776 | * VMA allows access but EPCM permissions do not. |
777 | */ |
778 | TEST_F(enclave, epcm_permissions) |
779 | { |
780 | struct sgx_enclave_restrict_permissions restrict_ioc; |
781 | struct encl_op_get_from_addr get_addr_op; |
782 | struct encl_op_put_to_addr put_addr_op; |
783 | struct encl_op_eaccept eaccept_op; |
784 | struct encl_op_emodpe emodpe_op; |
785 | unsigned long data_start; |
786 | int ret, errno_save; |
787 | |
788 | ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)); |
789 | |
790 | memset(&self->run, 0, sizeof(self->run)); |
791 | self->run.tcs = self->encl.encl_base; |
792 | |
793 | /* |
794 | * Ensure kernel supports needed ioctl() and system supports needed |
795 | * commands. |
796 | */ |
797 | memset(&restrict_ioc, 0, sizeof(restrict_ioc)); |
798 | |
799 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_RESTRICT_PERMISSIONS, |
800 | &restrict_ioc); |
801 | errno_save = ret == -1 ? errno : 0; |
802 | |
803 | /* |
804 | * Invalid parameters were provided during sanity check, |
805 | * expect command to fail. |
806 | */ |
807 | ASSERT_EQ(ret, -1); |
808 | |
809 | /* ret == -1 */ |
810 | if (errno_save == ENOTTY) |
811 | SKIP(return, |
812 | "Kernel does not support SGX_IOC_ENCLAVE_RESTRICT_PERMISSIONS ioctl()" ); |
813 | else if (errno_save == ENODEV) |
814 | SKIP(return, "System does not support SGX2" ); |
815 | |
816 | /* |
817 | * Page that will have its permissions changed is the second data |
818 | * page in the .data segment. This forms part of the local encl_buffer |
819 | * within the enclave. |
820 | * |
821 | * At start of test @data_start should have EPCM as well as PTE and |
822 | * VMA permissions of RW. |
823 | */ |
824 | |
825 | data_start = self->encl.encl_base + |
826 | encl_get_data_offset(encl: &self->encl) + PAGE_SIZE; |
827 | |
828 | /* |
829 | * Sanity check that page at @data_start is writable before making |
830 | * any changes to page permissions. |
831 | * |
832 | * Start by writing MAGIC to test page. |
833 | */ |
834 | put_addr_op.value = MAGIC; |
835 | put_addr_op.addr = data_start; |
836 | put_addr_op.header.type = ENCL_OP_PUT_TO_ADDRESS; |
837 | |
838 | EXPECT_EQ(ENCL_CALL(&put_addr_op, &self->run, true), 0); |
839 | |
840 | EXPECT_EEXIT(&self->run); |
841 | EXPECT_EQ(self->run.exception_vector, 0); |
842 | EXPECT_EQ(self->run.exception_error_code, 0); |
843 | EXPECT_EQ(self->run.exception_addr, 0); |
844 | |
845 | /* |
846 | * Read memory that was just written to, confirming that |
847 | * page is writable. |
848 | */ |
849 | get_addr_op.value = 0; |
850 | get_addr_op.addr = data_start; |
851 | get_addr_op.header.type = ENCL_OP_GET_FROM_ADDRESS; |
852 | |
853 | EXPECT_EQ(ENCL_CALL(&get_addr_op, &self->run, true), 0); |
854 | |
855 | EXPECT_EQ(get_addr_op.value, MAGIC); |
856 | EXPECT_EEXIT(&self->run); |
857 | EXPECT_EQ(self->run.exception_vector, 0); |
858 | EXPECT_EQ(self->run.exception_error_code, 0); |
859 | EXPECT_EQ(self->run.exception_addr, 0); |
860 | |
861 | /* |
862 | * Change EPCM permissions to read-only. Kernel still considers |
863 | * the page writable. |
864 | */ |
865 | memset(&restrict_ioc, 0, sizeof(restrict_ioc)); |
866 | |
867 | restrict_ioc.offset = encl_get_data_offset(encl: &self->encl) + PAGE_SIZE; |
868 | restrict_ioc.length = PAGE_SIZE; |
869 | restrict_ioc.permissions = SGX_SECINFO_R; |
870 | |
871 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_RESTRICT_PERMISSIONS, |
872 | &restrict_ioc); |
873 | errno_save = ret == -1 ? errno : 0; |
874 | |
875 | EXPECT_EQ(ret, 0); |
876 | EXPECT_EQ(errno_save, 0); |
877 | EXPECT_EQ(restrict_ioc.result, 0); |
878 | EXPECT_EQ(restrict_ioc.count, 4096); |
879 | |
880 | /* |
881 | * EPCM permissions changed from kernel, need to EACCEPT from enclave. |
882 | */ |
883 | eaccept_op.epc_addr = data_start; |
884 | eaccept_op.flags = SGX_SECINFO_R | SGX_SECINFO_REG | SGX_SECINFO_PR; |
885 | eaccept_op.ret = 0; |
886 | eaccept_op.header.type = ENCL_OP_EACCEPT; |
887 | |
888 | EXPECT_EQ(ENCL_CALL(&eaccept_op, &self->run, true), 0); |
889 | |
890 | EXPECT_EEXIT(&self->run); |
891 | EXPECT_EQ(self->run.exception_vector, 0); |
892 | EXPECT_EQ(self->run.exception_error_code, 0); |
893 | EXPECT_EQ(self->run.exception_addr, 0); |
894 | EXPECT_EQ(eaccept_op.ret, 0); |
895 | |
896 | /* |
897 | * EPCM permissions of page is now read-only, expect #PF |
898 | * on EPCM when attempting to write to page from within enclave. |
899 | */ |
900 | put_addr_op.value = MAGIC2; |
901 | |
902 | EXPECT_EQ(ENCL_CALL(&put_addr_op, &self->run, true), 0); |
903 | |
904 | EXPECT_EQ(self->run.function, ERESUME); |
905 | EXPECT_EQ(self->run.exception_vector, 14); |
906 | EXPECT_EQ(self->run.exception_error_code, 0x8007); |
907 | EXPECT_EQ(self->run.exception_addr, data_start); |
908 | |
909 | self->run.exception_vector = 0; |
910 | self->run.exception_error_code = 0; |
911 | self->run.exception_addr = 0; |
912 | |
913 | /* |
914 | * Received AEX but cannot return to enclave at same entrypoint, |
915 | * need different TCS from where EPCM permission can be made writable |
916 | * again. |
917 | */ |
918 | self->run.tcs = self->encl.encl_base + PAGE_SIZE; |
919 | |
920 | /* |
921 | * Enter enclave at new TCS to change EPCM permissions to be |
922 | * writable again and thus fix the page fault that triggered the |
923 | * AEX. |
924 | */ |
925 | |
926 | emodpe_op.epc_addr = data_start; |
927 | emodpe_op.flags = SGX_SECINFO_R | SGX_SECINFO_W; |
928 | emodpe_op.header.type = ENCL_OP_EMODPE; |
929 | |
930 | EXPECT_EQ(ENCL_CALL(&emodpe_op, &self->run, true), 0); |
931 | |
932 | EXPECT_EEXIT(&self->run); |
933 | EXPECT_EQ(self->run.exception_vector, 0); |
934 | EXPECT_EQ(self->run.exception_error_code, 0); |
935 | EXPECT_EQ(self->run.exception_addr, 0); |
936 | |
937 | /* |
938 | * Attempt to return to main TCS to resume execution at faulting |
939 | * instruction, PTE should continue to allow writing to the page. |
940 | */ |
941 | self->run.tcs = self->encl.encl_base; |
942 | |
943 | /* |
944 | * Wrong page permissions that caused original fault has |
945 | * now been fixed via EPCM permissions. |
946 | * Resume execution in main TCS to re-attempt the memory access. |
947 | */ |
948 | self->run.tcs = self->encl.encl_base; |
949 | |
950 | EXPECT_EQ(vdso_sgx_enter_enclave((unsigned long)&put_addr_op, 0, 0, |
951 | ERESUME, 0, 0, |
952 | &self->run), |
953 | 0); |
954 | |
955 | EXPECT_EEXIT(&self->run); |
956 | EXPECT_EQ(self->run.exception_vector, 0); |
957 | EXPECT_EQ(self->run.exception_error_code, 0); |
958 | EXPECT_EQ(self->run.exception_addr, 0); |
959 | |
960 | get_addr_op.value = 0; |
961 | |
962 | EXPECT_EQ(ENCL_CALL(&get_addr_op, &self->run, true), 0); |
963 | |
964 | EXPECT_EQ(get_addr_op.value, MAGIC2); |
965 | EXPECT_EEXIT(&self->run); |
966 | EXPECT_EQ(self->run.user_data, 0); |
967 | EXPECT_EQ(self->run.exception_vector, 0); |
968 | EXPECT_EQ(self->run.exception_error_code, 0); |
969 | EXPECT_EQ(self->run.exception_addr, 0); |
970 | } |
971 | |
972 | /* |
973 | * Test the addition of pages to an initialized enclave via writing to |
974 | * a page belonging to the enclave's address space but was not added |
975 | * during enclave creation. |
976 | */ |
977 | TEST_F(enclave, augment) |
978 | { |
979 | struct encl_op_get_from_addr get_addr_op; |
980 | struct encl_op_put_to_addr put_addr_op; |
981 | struct encl_op_eaccept eaccept_op; |
982 | size_t total_size = 0; |
983 | void *addr; |
984 | int i; |
985 | |
986 | if (!sgx2_supported()) |
987 | SKIP(return, "SGX2 not supported" ); |
988 | |
989 | ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)); |
990 | |
991 | memset(&self->run, 0, sizeof(self->run)); |
992 | self->run.tcs = self->encl.encl_base; |
993 | |
994 | for (i = 0; i < self->encl.nr_segments; i++) { |
995 | struct encl_segment *seg = &self->encl.segment_tbl[i]; |
996 | |
997 | total_size += seg->size; |
998 | } |
999 | |
1000 | /* |
1001 | * Actual enclave size is expected to be larger than the loaded |
1002 | * test enclave since enclave size must be a power of 2 in bytes |
1003 | * and test_encl does not consume it all. |
1004 | */ |
1005 | EXPECT_LT(total_size + PAGE_SIZE, self->encl.encl_size); |
1006 | |
1007 | /* |
1008 | * Create memory mapping for the page that will be added. New |
1009 | * memory mapping is for one page right after all existing |
1010 | * mappings. |
1011 | * Kernel will allow new mapping using any permissions if it |
1012 | * falls into the enclave's address range but not backed |
1013 | * by existing enclave pages. |
1014 | */ |
1015 | addr = mmap((void *)self->encl.encl_base + total_size, PAGE_SIZE, |
1016 | PROT_READ | PROT_WRITE | PROT_EXEC, |
1017 | MAP_SHARED | MAP_FIXED, self->encl.fd, 0); |
1018 | EXPECT_NE(addr, MAP_FAILED); |
1019 | |
1020 | self->run.exception_vector = 0; |
1021 | self->run.exception_error_code = 0; |
1022 | self->run.exception_addr = 0; |
1023 | |
1024 | /* |
1025 | * Attempt to write to the new page from within enclave. |
1026 | * Expected to fail since page is not (yet) part of the enclave. |
1027 | * The first #PF will trigger the addition of the page to the |
1028 | * enclave, but since the new page needs an EACCEPT from within the |
1029 | * enclave before it can be used it would not be possible |
1030 | * to successfully return to the failing instruction. This is the |
1031 | * cause of the second #PF captured here having the SGX bit set, |
1032 | * it is from hardware preventing the page from being used. |
1033 | */ |
1034 | put_addr_op.value = MAGIC; |
1035 | put_addr_op.addr = (unsigned long)addr; |
1036 | put_addr_op.header.type = ENCL_OP_PUT_TO_ADDRESS; |
1037 | |
1038 | EXPECT_EQ(ENCL_CALL(&put_addr_op, &self->run, true), 0); |
1039 | |
1040 | EXPECT_EQ(self->run.function, ERESUME); |
1041 | EXPECT_EQ(self->run.exception_vector, 14); |
1042 | EXPECT_EQ(self->run.exception_addr, (unsigned long)addr); |
1043 | |
1044 | if (self->run.exception_error_code == 0x6) { |
1045 | munmap(addr, PAGE_SIZE); |
1046 | SKIP(return, "Kernel does not support adding pages to initialized enclave" ); |
1047 | } |
1048 | |
1049 | EXPECT_EQ(self->run.exception_error_code, 0x8007); |
1050 | |
1051 | self->run.exception_vector = 0; |
1052 | self->run.exception_error_code = 0; |
1053 | self->run.exception_addr = 0; |
1054 | |
1055 | /* Handle AEX by running EACCEPT from new entry point. */ |
1056 | self->run.tcs = self->encl.encl_base + PAGE_SIZE; |
1057 | |
1058 | eaccept_op.epc_addr = self->encl.encl_base + total_size; |
1059 | eaccept_op.flags = SGX_SECINFO_R | SGX_SECINFO_W | SGX_SECINFO_REG | SGX_SECINFO_PENDING; |
1060 | eaccept_op.ret = 0; |
1061 | eaccept_op.header.type = ENCL_OP_EACCEPT; |
1062 | |
1063 | EXPECT_EQ(ENCL_CALL(&eaccept_op, &self->run, true), 0); |
1064 | |
1065 | EXPECT_EEXIT(&self->run); |
1066 | EXPECT_EQ(self->run.exception_vector, 0); |
1067 | EXPECT_EQ(self->run.exception_error_code, 0); |
1068 | EXPECT_EQ(self->run.exception_addr, 0); |
1069 | EXPECT_EQ(eaccept_op.ret, 0); |
1070 | |
1071 | /* Can now return to main TCS to resume execution. */ |
1072 | self->run.tcs = self->encl.encl_base; |
1073 | |
1074 | EXPECT_EQ(vdso_sgx_enter_enclave((unsigned long)&put_addr_op, 0, 0, |
1075 | ERESUME, 0, 0, |
1076 | &self->run), |
1077 | 0); |
1078 | |
1079 | EXPECT_EEXIT(&self->run); |
1080 | EXPECT_EQ(self->run.exception_vector, 0); |
1081 | EXPECT_EQ(self->run.exception_error_code, 0); |
1082 | EXPECT_EQ(self->run.exception_addr, 0); |
1083 | |
1084 | /* |
1085 | * Read memory from newly added page that was just written to, |
1086 | * confirming that data previously written (MAGIC) is present. |
1087 | */ |
1088 | get_addr_op.value = 0; |
1089 | get_addr_op.addr = (unsigned long)addr; |
1090 | get_addr_op.header.type = ENCL_OP_GET_FROM_ADDRESS; |
1091 | |
1092 | EXPECT_EQ(ENCL_CALL(&get_addr_op, &self->run, true), 0); |
1093 | |
1094 | EXPECT_EQ(get_addr_op.value, MAGIC); |
1095 | EXPECT_EEXIT(&self->run); |
1096 | EXPECT_EQ(self->run.exception_vector, 0); |
1097 | EXPECT_EQ(self->run.exception_error_code, 0); |
1098 | EXPECT_EQ(self->run.exception_addr, 0); |
1099 | |
1100 | munmap(addr, PAGE_SIZE); |
1101 | } |
1102 | |
1103 | /* |
1104 | * Test for the addition of pages to an initialized enclave via a |
1105 | * pre-emptive run of EACCEPT on page to be added. |
1106 | */ |
1107 | TEST_F(enclave, augment_via_eaccept) |
1108 | { |
1109 | struct encl_op_get_from_addr get_addr_op; |
1110 | struct encl_op_put_to_addr put_addr_op; |
1111 | struct encl_op_eaccept eaccept_op; |
1112 | size_t total_size = 0; |
1113 | void *addr; |
1114 | int i; |
1115 | |
1116 | if (!sgx2_supported()) |
1117 | SKIP(return, "SGX2 not supported" ); |
1118 | |
1119 | ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)); |
1120 | |
1121 | memset(&self->run, 0, sizeof(self->run)); |
1122 | self->run.tcs = self->encl.encl_base; |
1123 | |
1124 | for (i = 0; i < self->encl.nr_segments; i++) { |
1125 | struct encl_segment *seg = &self->encl.segment_tbl[i]; |
1126 | |
1127 | total_size += seg->size; |
1128 | } |
1129 | |
1130 | /* |
1131 | * Actual enclave size is expected to be larger than the loaded |
1132 | * test enclave since enclave size must be a power of 2 in bytes while |
1133 | * test_encl does not consume it all. |
1134 | */ |
1135 | EXPECT_LT(total_size + PAGE_SIZE, self->encl.encl_size); |
1136 | |
1137 | /* |
1138 | * mmap() a page at end of existing enclave to be used for dynamic |
1139 | * EPC page. |
1140 | * |
1141 | * Kernel will allow new mapping using any permissions if it |
1142 | * falls into the enclave's address range but not backed |
1143 | * by existing enclave pages. |
1144 | */ |
1145 | |
1146 | addr = mmap((void *)self->encl.encl_base + total_size, PAGE_SIZE, |
1147 | PROT_READ | PROT_WRITE | PROT_EXEC, MAP_SHARED | MAP_FIXED, |
1148 | self->encl.fd, 0); |
1149 | EXPECT_NE(addr, MAP_FAILED); |
1150 | |
1151 | self->run.exception_vector = 0; |
1152 | self->run.exception_error_code = 0; |
1153 | self->run.exception_addr = 0; |
1154 | |
1155 | /* |
1156 | * Run EACCEPT on new page to trigger the #PF->EAUG->EACCEPT(again |
1157 | * without a #PF). All should be transparent to userspace. |
1158 | */ |
1159 | eaccept_op.epc_addr = self->encl.encl_base + total_size; |
1160 | eaccept_op.flags = SGX_SECINFO_R | SGX_SECINFO_W | SGX_SECINFO_REG | SGX_SECINFO_PENDING; |
1161 | eaccept_op.ret = 0; |
1162 | eaccept_op.header.type = ENCL_OP_EACCEPT; |
1163 | |
1164 | EXPECT_EQ(ENCL_CALL(&eaccept_op, &self->run, true), 0); |
1165 | |
1166 | if (self->run.exception_vector == 14 && |
1167 | self->run.exception_error_code == 4 && |
1168 | self->run.exception_addr == self->encl.encl_base + total_size) { |
1169 | munmap(addr, PAGE_SIZE); |
1170 | SKIP(return, "Kernel does not support adding pages to initialized enclave" ); |
1171 | } |
1172 | |
1173 | EXPECT_EEXIT(&self->run); |
1174 | EXPECT_EQ(self->run.exception_vector, 0); |
1175 | EXPECT_EQ(self->run.exception_error_code, 0); |
1176 | EXPECT_EQ(self->run.exception_addr, 0); |
1177 | EXPECT_EQ(eaccept_op.ret, 0); |
1178 | |
1179 | /* |
1180 | * New page should be accessible from within enclave - attempt to |
1181 | * write to it. |
1182 | */ |
1183 | put_addr_op.value = MAGIC; |
1184 | put_addr_op.addr = (unsigned long)addr; |
1185 | put_addr_op.header.type = ENCL_OP_PUT_TO_ADDRESS; |
1186 | |
1187 | EXPECT_EQ(ENCL_CALL(&put_addr_op, &self->run, true), 0); |
1188 | |
1189 | EXPECT_EEXIT(&self->run); |
1190 | EXPECT_EQ(self->run.exception_vector, 0); |
1191 | EXPECT_EQ(self->run.exception_error_code, 0); |
1192 | EXPECT_EQ(self->run.exception_addr, 0); |
1193 | |
1194 | /* |
1195 | * Read memory from newly added page that was just written to, |
1196 | * confirming that data previously written (MAGIC) is present. |
1197 | */ |
1198 | get_addr_op.value = 0; |
1199 | get_addr_op.addr = (unsigned long)addr; |
1200 | get_addr_op.header.type = ENCL_OP_GET_FROM_ADDRESS; |
1201 | |
1202 | EXPECT_EQ(ENCL_CALL(&get_addr_op, &self->run, true), 0); |
1203 | |
1204 | EXPECT_EQ(get_addr_op.value, MAGIC); |
1205 | EXPECT_EEXIT(&self->run); |
1206 | EXPECT_EQ(self->run.exception_vector, 0); |
1207 | EXPECT_EQ(self->run.exception_error_code, 0); |
1208 | EXPECT_EQ(self->run.exception_addr, 0); |
1209 | |
1210 | munmap(addr, PAGE_SIZE); |
1211 | } |
1212 | |
1213 | /* |
1214 | * SGX2 page type modification test in two phases: |
1215 | * Phase 1: |
1216 | * Create a new TCS, consisting out of three new pages (stack page with regular |
1217 | * page type, SSA page with regular page type, and TCS page with TCS page |
1218 | * type) in an initialized enclave and run a simple workload within it. |
1219 | * Phase 2: |
1220 | * Remove the three pages added in phase 1, add a new regular page at the |
1221 | * same address that previously hosted the TCS page and verify that it can |
1222 | * be modified. |
1223 | */ |
1224 | TEST_F(enclave, tcs_create) |
1225 | { |
1226 | struct encl_op_init_tcs_page init_tcs_page_op; |
1227 | struct sgx_enclave_remove_pages remove_ioc; |
1228 | struct encl_op_get_from_addr get_addr_op; |
1229 | struct sgx_enclave_modify_types modt_ioc; |
1230 | struct encl_op_put_to_addr put_addr_op; |
1231 | struct encl_op_get_from_buf get_buf_op; |
1232 | struct encl_op_put_to_buf put_buf_op; |
1233 | void *addr, *tcs, *stack_end, *ssa; |
1234 | struct encl_op_eaccept eaccept_op; |
1235 | size_t total_size = 0; |
1236 | uint64_t val_64; |
1237 | int errno_save; |
1238 | int ret, i; |
1239 | |
1240 | ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, |
1241 | _metadata)); |
1242 | |
1243 | memset(&self->run, 0, sizeof(self->run)); |
1244 | self->run.tcs = self->encl.encl_base; |
1245 | |
1246 | /* |
1247 | * Hardware (SGX2) and kernel support is needed for this test. Start |
1248 | * with check that test has a chance of succeeding. |
1249 | */ |
1250 | memset(&modt_ioc, 0, sizeof(modt_ioc)); |
1251 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_MODIFY_TYPES, &modt_ioc); |
1252 | |
1253 | if (ret == -1) { |
1254 | if (errno == ENOTTY) |
1255 | SKIP(return, |
1256 | "Kernel does not support SGX_IOC_ENCLAVE_MODIFY_TYPES ioctl()" ); |
1257 | else if (errno == ENODEV) |
1258 | SKIP(return, "System does not support SGX2" ); |
1259 | } |
1260 | |
1261 | /* |
1262 | * Invalid parameters were provided during sanity check, |
1263 | * expect command to fail. |
1264 | */ |
1265 | EXPECT_EQ(ret, -1); |
1266 | |
1267 | /* |
1268 | * Add three regular pages via EAUG: one will be the TCS stack, one |
1269 | * will be the TCS SSA, and one will be the new TCS. The stack and |
1270 | * SSA will remain as regular pages, the TCS page will need its |
1271 | * type changed after populated with needed data. |
1272 | */ |
1273 | for (i = 0; i < self->encl.nr_segments; i++) { |
1274 | struct encl_segment *seg = &self->encl.segment_tbl[i]; |
1275 | |
1276 | total_size += seg->size; |
1277 | } |
1278 | |
1279 | /* |
1280 | * Actual enclave size is expected to be larger than the loaded |
1281 | * test enclave since enclave size must be a power of 2 in bytes while |
1282 | * test_encl does not consume it all. |
1283 | */ |
1284 | EXPECT_LT(total_size + 3 * PAGE_SIZE, self->encl.encl_size); |
1285 | |
1286 | /* |
1287 | * mmap() three pages at end of existing enclave to be used for the |
1288 | * three new pages. |
1289 | */ |
1290 | addr = mmap((void *)self->encl.encl_base + total_size, 3 * PAGE_SIZE, |
1291 | PROT_READ | PROT_WRITE, MAP_SHARED | MAP_FIXED, |
1292 | self->encl.fd, 0); |
1293 | EXPECT_NE(addr, MAP_FAILED); |
1294 | |
1295 | self->run.exception_vector = 0; |
1296 | self->run.exception_error_code = 0; |
1297 | self->run.exception_addr = 0; |
1298 | |
1299 | stack_end = (void *)self->encl.encl_base + total_size; |
1300 | tcs = (void *)self->encl.encl_base + total_size + PAGE_SIZE; |
1301 | ssa = (void *)self->encl.encl_base + total_size + 2 * PAGE_SIZE; |
1302 | |
1303 | /* |
1304 | * Run EACCEPT on each new page to trigger the |
1305 | * EACCEPT->(#PF)->EAUG->EACCEPT(again without a #PF) flow. |
1306 | */ |
1307 | |
1308 | eaccept_op.epc_addr = (unsigned long)stack_end; |
1309 | eaccept_op.flags = SGX_SECINFO_R | SGX_SECINFO_W | SGX_SECINFO_REG | SGX_SECINFO_PENDING; |
1310 | eaccept_op.ret = 0; |
1311 | eaccept_op.header.type = ENCL_OP_EACCEPT; |
1312 | |
1313 | EXPECT_EQ(ENCL_CALL(&eaccept_op, &self->run, true), 0); |
1314 | |
1315 | if (self->run.exception_vector == 14 && |
1316 | self->run.exception_error_code == 4 && |
1317 | self->run.exception_addr == (unsigned long)stack_end) { |
1318 | munmap(addr, 3 * PAGE_SIZE); |
1319 | SKIP(return, "Kernel does not support adding pages to initialized enclave" ); |
1320 | } |
1321 | |
1322 | EXPECT_EEXIT(&self->run); |
1323 | EXPECT_EQ(self->run.exception_vector, 0); |
1324 | EXPECT_EQ(self->run.exception_error_code, 0); |
1325 | EXPECT_EQ(self->run.exception_addr, 0); |
1326 | EXPECT_EQ(eaccept_op.ret, 0); |
1327 | |
1328 | eaccept_op.epc_addr = (unsigned long)ssa; |
1329 | |
1330 | EXPECT_EQ(ENCL_CALL(&eaccept_op, &self->run, true), 0); |
1331 | |
1332 | EXPECT_EEXIT(&self->run); |
1333 | EXPECT_EQ(self->run.exception_vector, 0); |
1334 | EXPECT_EQ(self->run.exception_error_code, 0); |
1335 | EXPECT_EQ(self->run.exception_addr, 0); |
1336 | EXPECT_EQ(eaccept_op.ret, 0); |
1337 | |
1338 | eaccept_op.epc_addr = (unsigned long)tcs; |
1339 | |
1340 | EXPECT_EQ(ENCL_CALL(&eaccept_op, &self->run, true), 0); |
1341 | |
1342 | EXPECT_EEXIT(&self->run); |
1343 | EXPECT_EQ(self->run.exception_vector, 0); |
1344 | EXPECT_EQ(self->run.exception_error_code, 0); |
1345 | EXPECT_EQ(self->run.exception_addr, 0); |
1346 | EXPECT_EQ(eaccept_op.ret, 0); |
1347 | |
1348 | /* |
1349 | * Three new pages added to enclave. Now populate the TCS page with |
1350 | * needed data. This should be done from within enclave. Provide |
1351 | * the function that will do the actual data population with needed |
1352 | * data. |
1353 | */ |
1354 | |
1355 | /* |
1356 | * New TCS will use the "encl_dyn_entry" entrypoint that expects |
1357 | * stack to begin in page before TCS page. |
1358 | */ |
1359 | val_64 = encl_get_entry(encl: &self->encl, symbol: "encl_dyn_entry" ); |
1360 | EXPECT_NE(val_64, 0); |
1361 | |
1362 | init_tcs_page_op.tcs_page = (unsigned long)tcs; |
1363 | init_tcs_page_op.ssa = (unsigned long)total_size + 2 * PAGE_SIZE; |
1364 | init_tcs_page_op.entry = val_64; |
1365 | init_tcs_page_op.header.type = ENCL_OP_INIT_TCS_PAGE; |
1366 | |
1367 | EXPECT_EQ(ENCL_CALL(&init_tcs_page_op, &self->run, true), 0); |
1368 | |
1369 | EXPECT_EEXIT(&self->run); |
1370 | EXPECT_EQ(self->run.exception_vector, 0); |
1371 | EXPECT_EQ(self->run.exception_error_code, 0); |
1372 | EXPECT_EQ(self->run.exception_addr, 0); |
1373 | |
1374 | /* Change TCS page type to TCS. */ |
1375 | memset(&modt_ioc, 0, sizeof(modt_ioc)); |
1376 | |
1377 | modt_ioc.offset = total_size + PAGE_SIZE; |
1378 | modt_ioc.length = PAGE_SIZE; |
1379 | modt_ioc.page_type = SGX_PAGE_TYPE_TCS; |
1380 | |
1381 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_MODIFY_TYPES, &modt_ioc); |
1382 | errno_save = ret == -1 ? errno : 0; |
1383 | |
1384 | EXPECT_EQ(ret, 0); |
1385 | EXPECT_EQ(errno_save, 0); |
1386 | EXPECT_EQ(modt_ioc.result, 0); |
1387 | EXPECT_EQ(modt_ioc.count, 4096); |
1388 | |
1389 | /* EACCEPT new TCS page from enclave. */ |
1390 | eaccept_op.epc_addr = (unsigned long)tcs; |
1391 | eaccept_op.flags = SGX_SECINFO_TCS | SGX_SECINFO_MODIFIED; |
1392 | eaccept_op.ret = 0; |
1393 | eaccept_op.header.type = ENCL_OP_EACCEPT; |
1394 | |
1395 | EXPECT_EQ(ENCL_CALL(&eaccept_op, &self->run, true), 0); |
1396 | |
1397 | EXPECT_EEXIT(&self->run); |
1398 | EXPECT_EQ(self->run.exception_vector, 0); |
1399 | EXPECT_EQ(self->run.exception_error_code, 0); |
1400 | EXPECT_EQ(self->run.exception_addr, 0); |
1401 | EXPECT_EQ(eaccept_op.ret, 0); |
1402 | |
1403 | /* Run workload from new TCS. */ |
1404 | self->run.tcs = (unsigned long)tcs; |
1405 | |
1406 | /* |
1407 | * Simple workload to write to data buffer and read value back. |
1408 | */ |
1409 | put_buf_op.header.type = ENCL_OP_PUT_TO_BUFFER; |
1410 | put_buf_op.value = MAGIC; |
1411 | |
1412 | EXPECT_EQ(ENCL_CALL(&put_buf_op, &self->run, true), 0); |
1413 | |
1414 | EXPECT_EEXIT(&self->run); |
1415 | EXPECT_EQ(self->run.exception_vector, 0); |
1416 | EXPECT_EQ(self->run.exception_error_code, 0); |
1417 | EXPECT_EQ(self->run.exception_addr, 0); |
1418 | |
1419 | get_buf_op.header.type = ENCL_OP_GET_FROM_BUFFER; |
1420 | get_buf_op.value = 0; |
1421 | |
1422 | EXPECT_EQ(ENCL_CALL(&get_buf_op, &self->run, true), 0); |
1423 | |
1424 | EXPECT_EQ(get_buf_op.value, MAGIC); |
1425 | EXPECT_EEXIT(&self->run); |
1426 | EXPECT_EQ(self->run.exception_vector, 0); |
1427 | EXPECT_EQ(self->run.exception_error_code, 0); |
1428 | EXPECT_EQ(self->run.exception_addr, 0); |
1429 | |
1430 | /* |
1431 | * Phase 2 of test: |
1432 | * Remove pages associated with new TCS, create a regular page |
1433 | * where TCS page used to be and verify it can be used as a regular |
1434 | * page. |
1435 | */ |
1436 | |
1437 | /* Start page removal by requesting change of page type to PT_TRIM. */ |
1438 | memset(&modt_ioc, 0, sizeof(modt_ioc)); |
1439 | |
1440 | modt_ioc.offset = total_size; |
1441 | modt_ioc.length = 3 * PAGE_SIZE; |
1442 | modt_ioc.page_type = SGX_PAGE_TYPE_TRIM; |
1443 | |
1444 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_MODIFY_TYPES, &modt_ioc); |
1445 | errno_save = ret == -1 ? errno : 0; |
1446 | |
1447 | EXPECT_EQ(ret, 0); |
1448 | EXPECT_EQ(errno_save, 0); |
1449 | EXPECT_EQ(modt_ioc.result, 0); |
1450 | EXPECT_EQ(modt_ioc.count, 3 * PAGE_SIZE); |
1451 | |
1452 | /* |
1453 | * Enter enclave via TCS #1 and approve page removal by sending |
1454 | * EACCEPT for each of three removed pages. |
1455 | */ |
1456 | self->run.tcs = self->encl.encl_base; |
1457 | |
1458 | eaccept_op.epc_addr = (unsigned long)stack_end; |
1459 | eaccept_op.flags = SGX_SECINFO_TRIM | SGX_SECINFO_MODIFIED; |
1460 | eaccept_op.ret = 0; |
1461 | eaccept_op.header.type = ENCL_OP_EACCEPT; |
1462 | |
1463 | EXPECT_EQ(ENCL_CALL(&eaccept_op, &self->run, true), 0); |
1464 | |
1465 | EXPECT_EEXIT(&self->run); |
1466 | EXPECT_EQ(self->run.exception_vector, 0); |
1467 | EXPECT_EQ(self->run.exception_error_code, 0); |
1468 | EXPECT_EQ(self->run.exception_addr, 0); |
1469 | EXPECT_EQ(eaccept_op.ret, 0); |
1470 | |
1471 | eaccept_op.epc_addr = (unsigned long)tcs; |
1472 | eaccept_op.ret = 0; |
1473 | |
1474 | EXPECT_EQ(ENCL_CALL(&eaccept_op, &self->run, true), 0); |
1475 | |
1476 | EXPECT_EEXIT(&self->run); |
1477 | EXPECT_EQ(self->run.exception_vector, 0); |
1478 | EXPECT_EQ(self->run.exception_error_code, 0); |
1479 | EXPECT_EQ(self->run.exception_addr, 0); |
1480 | EXPECT_EQ(eaccept_op.ret, 0); |
1481 | |
1482 | eaccept_op.epc_addr = (unsigned long)ssa; |
1483 | eaccept_op.ret = 0; |
1484 | |
1485 | EXPECT_EQ(ENCL_CALL(&eaccept_op, &self->run, true), 0); |
1486 | |
1487 | EXPECT_EEXIT(&self->run); |
1488 | EXPECT_EQ(self->run.exception_vector, 0); |
1489 | EXPECT_EQ(self->run.exception_error_code, 0); |
1490 | EXPECT_EQ(self->run.exception_addr, 0); |
1491 | EXPECT_EQ(eaccept_op.ret, 0); |
1492 | |
1493 | /* Send final ioctl() to complete page removal. */ |
1494 | memset(&remove_ioc, 0, sizeof(remove_ioc)); |
1495 | |
1496 | remove_ioc.offset = total_size; |
1497 | remove_ioc.length = 3 * PAGE_SIZE; |
1498 | |
1499 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_REMOVE_PAGES, &remove_ioc); |
1500 | errno_save = ret == -1 ? errno : 0; |
1501 | |
1502 | EXPECT_EQ(ret, 0); |
1503 | EXPECT_EQ(errno_save, 0); |
1504 | EXPECT_EQ(remove_ioc.count, 3 * PAGE_SIZE); |
1505 | |
1506 | /* |
1507 | * Enter enclave via TCS #1 and access location where TCS #3 was to |
1508 | * trigger dynamic add of regular page at that location. |
1509 | */ |
1510 | eaccept_op.epc_addr = (unsigned long)tcs; |
1511 | eaccept_op.flags = SGX_SECINFO_R | SGX_SECINFO_W | SGX_SECINFO_REG | SGX_SECINFO_PENDING; |
1512 | eaccept_op.ret = 0; |
1513 | eaccept_op.header.type = ENCL_OP_EACCEPT; |
1514 | |
1515 | EXPECT_EQ(ENCL_CALL(&eaccept_op, &self->run, true), 0); |
1516 | |
1517 | EXPECT_EEXIT(&self->run); |
1518 | EXPECT_EQ(self->run.exception_vector, 0); |
1519 | EXPECT_EQ(self->run.exception_error_code, 0); |
1520 | EXPECT_EQ(self->run.exception_addr, 0); |
1521 | EXPECT_EQ(eaccept_op.ret, 0); |
1522 | |
1523 | /* |
1524 | * New page should be accessible from within enclave - write to it. |
1525 | */ |
1526 | put_addr_op.value = MAGIC; |
1527 | put_addr_op.addr = (unsigned long)tcs; |
1528 | put_addr_op.header.type = ENCL_OP_PUT_TO_ADDRESS; |
1529 | |
1530 | EXPECT_EQ(ENCL_CALL(&put_addr_op, &self->run, true), 0); |
1531 | |
1532 | EXPECT_EEXIT(&self->run); |
1533 | EXPECT_EQ(self->run.exception_vector, 0); |
1534 | EXPECT_EQ(self->run.exception_error_code, 0); |
1535 | EXPECT_EQ(self->run.exception_addr, 0); |
1536 | |
1537 | /* |
1538 | * Read memory from newly added page that was just written to, |
1539 | * confirming that data previously written (MAGIC) is present. |
1540 | */ |
1541 | get_addr_op.value = 0; |
1542 | get_addr_op.addr = (unsigned long)tcs; |
1543 | get_addr_op.header.type = ENCL_OP_GET_FROM_ADDRESS; |
1544 | |
1545 | EXPECT_EQ(ENCL_CALL(&get_addr_op, &self->run, true), 0); |
1546 | |
1547 | EXPECT_EQ(get_addr_op.value, MAGIC); |
1548 | EXPECT_EEXIT(&self->run); |
1549 | EXPECT_EQ(self->run.exception_vector, 0); |
1550 | EXPECT_EQ(self->run.exception_error_code, 0); |
1551 | EXPECT_EQ(self->run.exception_addr, 0); |
1552 | |
1553 | munmap(addr, 3 * PAGE_SIZE); |
1554 | } |
1555 | |
1556 | /* |
1557 | * Ensure sane behavior if user requests page removal, does not run |
1558 | * EACCEPT from within enclave but still attempts to finalize page removal |
1559 | * with the SGX_IOC_ENCLAVE_REMOVE_PAGES ioctl(). The latter should fail |
1560 | * because the removal was not EACCEPTed from within the enclave. |
1561 | */ |
1562 | TEST_F(enclave, remove_added_page_no_eaccept) |
1563 | { |
1564 | struct sgx_enclave_remove_pages remove_ioc; |
1565 | struct encl_op_get_from_addr get_addr_op; |
1566 | struct sgx_enclave_modify_types modt_ioc; |
1567 | struct encl_op_put_to_addr put_addr_op; |
1568 | unsigned long data_start; |
1569 | int ret, errno_save; |
1570 | |
1571 | ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)); |
1572 | |
1573 | memset(&self->run, 0, sizeof(self->run)); |
1574 | self->run.tcs = self->encl.encl_base; |
1575 | |
1576 | /* |
1577 | * Hardware (SGX2) and kernel support is needed for this test. Start |
1578 | * with check that test has a chance of succeeding. |
1579 | */ |
1580 | memset(&modt_ioc, 0, sizeof(modt_ioc)); |
1581 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_MODIFY_TYPES, &modt_ioc); |
1582 | |
1583 | if (ret == -1) { |
1584 | if (errno == ENOTTY) |
1585 | SKIP(return, |
1586 | "Kernel does not support SGX_IOC_ENCLAVE_MODIFY_TYPES ioctl()" ); |
1587 | else if (errno == ENODEV) |
1588 | SKIP(return, "System does not support SGX2" ); |
1589 | } |
1590 | |
1591 | /* |
1592 | * Invalid parameters were provided during sanity check, |
1593 | * expect command to fail. |
1594 | */ |
1595 | EXPECT_EQ(ret, -1); |
1596 | |
1597 | /* |
1598 | * Page that will be removed is the second data page in the .data |
1599 | * segment. This forms part of the local encl_buffer within the |
1600 | * enclave. |
1601 | */ |
1602 | data_start = self->encl.encl_base + |
1603 | encl_get_data_offset(encl: &self->encl) + PAGE_SIZE; |
1604 | |
1605 | /* |
1606 | * Sanity check that page at @data_start is writable before |
1607 | * removing it. |
1608 | * |
1609 | * Start by writing MAGIC to test page. |
1610 | */ |
1611 | put_addr_op.value = MAGIC; |
1612 | put_addr_op.addr = data_start; |
1613 | put_addr_op.header.type = ENCL_OP_PUT_TO_ADDRESS; |
1614 | |
1615 | EXPECT_EQ(ENCL_CALL(&put_addr_op, &self->run, true), 0); |
1616 | |
1617 | EXPECT_EEXIT(&self->run); |
1618 | EXPECT_EQ(self->run.exception_vector, 0); |
1619 | EXPECT_EQ(self->run.exception_error_code, 0); |
1620 | EXPECT_EQ(self->run.exception_addr, 0); |
1621 | |
1622 | /* |
1623 | * Read memory that was just written to, confirming that data |
1624 | * previously written (MAGIC) is present. |
1625 | */ |
1626 | get_addr_op.value = 0; |
1627 | get_addr_op.addr = data_start; |
1628 | get_addr_op.header.type = ENCL_OP_GET_FROM_ADDRESS; |
1629 | |
1630 | EXPECT_EQ(ENCL_CALL(&get_addr_op, &self->run, true), 0); |
1631 | |
1632 | EXPECT_EQ(get_addr_op.value, MAGIC); |
1633 | EXPECT_EEXIT(&self->run); |
1634 | EXPECT_EQ(self->run.exception_vector, 0); |
1635 | EXPECT_EQ(self->run.exception_error_code, 0); |
1636 | EXPECT_EQ(self->run.exception_addr, 0); |
1637 | |
1638 | /* Start page removal by requesting change of page type to PT_TRIM */ |
1639 | memset(&modt_ioc, 0, sizeof(modt_ioc)); |
1640 | |
1641 | modt_ioc.offset = encl_get_data_offset(encl: &self->encl) + PAGE_SIZE; |
1642 | modt_ioc.length = PAGE_SIZE; |
1643 | modt_ioc.page_type = SGX_PAGE_TYPE_TRIM; |
1644 | |
1645 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_MODIFY_TYPES, &modt_ioc); |
1646 | errno_save = ret == -1 ? errno : 0; |
1647 | |
1648 | EXPECT_EQ(ret, 0); |
1649 | EXPECT_EQ(errno_save, 0); |
1650 | EXPECT_EQ(modt_ioc.result, 0); |
1651 | EXPECT_EQ(modt_ioc.count, 4096); |
1652 | |
1653 | /* Skip EACCEPT */ |
1654 | |
1655 | /* Send final ioctl() to complete page removal */ |
1656 | memset(&remove_ioc, 0, sizeof(remove_ioc)); |
1657 | |
1658 | remove_ioc.offset = encl_get_data_offset(encl: &self->encl) + PAGE_SIZE; |
1659 | remove_ioc.length = PAGE_SIZE; |
1660 | |
1661 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_REMOVE_PAGES, &remove_ioc); |
1662 | errno_save = ret == -1 ? errno : 0; |
1663 | |
1664 | /* Operation not permitted since EACCEPT was omitted. */ |
1665 | EXPECT_EQ(ret, -1); |
1666 | EXPECT_EQ(errno_save, EPERM); |
1667 | EXPECT_EQ(remove_ioc.count, 0); |
1668 | } |
1669 | |
1670 | /* |
1671 | * Request enclave page removal but instead of correctly following with |
1672 | * EACCEPT a read attempt to page is made from within the enclave. |
1673 | */ |
1674 | TEST_F(enclave, remove_added_page_invalid_access) |
1675 | { |
1676 | struct encl_op_get_from_addr get_addr_op; |
1677 | struct encl_op_put_to_addr put_addr_op; |
1678 | struct sgx_enclave_modify_types ioc; |
1679 | unsigned long data_start; |
1680 | int ret, errno_save; |
1681 | |
1682 | ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)); |
1683 | |
1684 | memset(&self->run, 0, sizeof(self->run)); |
1685 | self->run.tcs = self->encl.encl_base; |
1686 | |
1687 | /* |
1688 | * Hardware (SGX2) and kernel support is needed for this test. Start |
1689 | * with check that test has a chance of succeeding. |
1690 | */ |
1691 | memset(&ioc, 0, sizeof(ioc)); |
1692 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_MODIFY_TYPES, &ioc); |
1693 | |
1694 | if (ret == -1) { |
1695 | if (errno == ENOTTY) |
1696 | SKIP(return, |
1697 | "Kernel does not support SGX_IOC_ENCLAVE_MODIFY_TYPES ioctl()" ); |
1698 | else if (errno == ENODEV) |
1699 | SKIP(return, "System does not support SGX2" ); |
1700 | } |
1701 | |
1702 | /* |
1703 | * Invalid parameters were provided during sanity check, |
1704 | * expect command to fail. |
1705 | */ |
1706 | EXPECT_EQ(ret, -1); |
1707 | |
1708 | /* |
1709 | * Page that will be removed is the second data page in the .data |
1710 | * segment. This forms part of the local encl_buffer within the |
1711 | * enclave. |
1712 | */ |
1713 | data_start = self->encl.encl_base + |
1714 | encl_get_data_offset(encl: &self->encl) + PAGE_SIZE; |
1715 | |
1716 | /* |
1717 | * Sanity check that page at @data_start is writable before |
1718 | * removing it. |
1719 | * |
1720 | * Start by writing MAGIC to test page. |
1721 | */ |
1722 | put_addr_op.value = MAGIC; |
1723 | put_addr_op.addr = data_start; |
1724 | put_addr_op.header.type = ENCL_OP_PUT_TO_ADDRESS; |
1725 | |
1726 | EXPECT_EQ(ENCL_CALL(&put_addr_op, &self->run, true), 0); |
1727 | |
1728 | EXPECT_EEXIT(&self->run); |
1729 | EXPECT_EQ(self->run.exception_vector, 0); |
1730 | EXPECT_EQ(self->run.exception_error_code, 0); |
1731 | EXPECT_EQ(self->run.exception_addr, 0); |
1732 | |
1733 | /* |
1734 | * Read memory that was just written to, confirming that data |
1735 | * previously written (MAGIC) is present. |
1736 | */ |
1737 | get_addr_op.value = 0; |
1738 | get_addr_op.addr = data_start; |
1739 | get_addr_op.header.type = ENCL_OP_GET_FROM_ADDRESS; |
1740 | |
1741 | EXPECT_EQ(ENCL_CALL(&get_addr_op, &self->run, true), 0); |
1742 | |
1743 | EXPECT_EQ(get_addr_op.value, MAGIC); |
1744 | EXPECT_EEXIT(&self->run); |
1745 | EXPECT_EQ(self->run.exception_vector, 0); |
1746 | EXPECT_EQ(self->run.exception_error_code, 0); |
1747 | EXPECT_EQ(self->run.exception_addr, 0); |
1748 | |
1749 | /* Start page removal by requesting change of page type to PT_TRIM. */ |
1750 | memset(&ioc, 0, sizeof(ioc)); |
1751 | |
1752 | ioc.offset = encl_get_data_offset(encl: &self->encl) + PAGE_SIZE; |
1753 | ioc.length = PAGE_SIZE; |
1754 | ioc.page_type = SGX_PAGE_TYPE_TRIM; |
1755 | |
1756 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_MODIFY_TYPES, &ioc); |
1757 | errno_save = ret == -1 ? errno : 0; |
1758 | |
1759 | EXPECT_EQ(ret, 0); |
1760 | EXPECT_EQ(errno_save, 0); |
1761 | EXPECT_EQ(ioc.result, 0); |
1762 | EXPECT_EQ(ioc.count, 4096); |
1763 | |
1764 | /* |
1765 | * Read from page that was just removed. |
1766 | */ |
1767 | get_addr_op.value = 0; |
1768 | |
1769 | EXPECT_EQ(ENCL_CALL(&get_addr_op, &self->run, true), 0); |
1770 | |
1771 | /* |
1772 | * From kernel perspective the page is present but according to SGX the |
1773 | * page should not be accessible so a #PF with SGX bit set is |
1774 | * expected. |
1775 | */ |
1776 | |
1777 | EXPECT_EQ(self->run.function, ERESUME); |
1778 | EXPECT_EQ(self->run.exception_vector, 14); |
1779 | EXPECT_EQ(self->run.exception_error_code, 0x8005); |
1780 | EXPECT_EQ(self->run.exception_addr, data_start); |
1781 | } |
1782 | |
1783 | /* |
1784 | * Request enclave page removal and correctly follow with |
1785 | * EACCEPT but do not follow with removal ioctl() but instead a read attempt |
1786 | * to removed page is made from within the enclave. |
1787 | */ |
1788 | TEST_F(enclave, remove_added_page_invalid_access_after_eaccept) |
1789 | { |
1790 | struct encl_op_get_from_addr get_addr_op; |
1791 | struct encl_op_put_to_addr put_addr_op; |
1792 | struct sgx_enclave_modify_types ioc; |
1793 | struct encl_op_eaccept eaccept_op; |
1794 | unsigned long data_start; |
1795 | int ret, errno_save; |
1796 | |
1797 | ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)); |
1798 | |
1799 | memset(&self->run, 0, sizeof(self->run)); |
1800 | self->run.tcs = self->encl.encl_base; |
1801 | |
1802 | /* |
1803 | * Hardware (SGX2) and kernel support is needed for this test. Start |
1804 | * with check that test has a chance of succeeding. |
1805 | */ |
1806 | memset(&ioc, 0, sizeof(ioc)); |
1807 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_MODIFY_TYPES, &ioc); |
1808 | |
1809 | if (ret == -1) { |
1810 | if (errno == ENOTTY) |
1811 | SKIP(return, |
1812 | "Kernel does not support SGX_IOC_ENCLAVE_MODIFY_TYPES ioctl()" ); |
1813 | else if (errno == ENODEV) |
1814 | SKIP(return, "System does not support SGX2" ); |
1815 | } |
1816 | |
1817 | /* |
1818 | * Invalid parameters were provided during sanity check, |
1819 | * expect command to fail. |
1820 | */ |
1821 | EXPECT_EQ(ret, -1); |
1822 | |
1823 | /* |
1824 | * Page that will be removed is the second data page in the .data |
1825 | * segment. This forms part of the local encl_buffer within the |
1826 | * enclave. |
1827 | */ |
1828 | data_start = self->encl.encl_base + |
1829 | encl_get_data_offset(encl: &self->encl) + PAGE_SIZE; |
1830 | |
1831 | /* |
1832 | * Sanity check that page at @data_start is writable before |
1833 | * removing it. |
1834 | * |
1835 | * Start by writing MAGIC to test page. |
1836 | */ |
1837 | put_addr_op.value = MAGIC; |
1838 | put_addr_op.addr = data_start; |
1839 | put_addr_op.header.type = ENCL_OP_PUT_TO_ADDRESS; |
1840 | |
1841 | EXPECT_EQ(ENCL_CALL(&put_addr_op, &self->run, true), 0); |
1842 | |
1843 | EXPECT_EEXIT(&self->run); |
1844 | EXPECT_EQ(self->run.exception_vector, 0); |
1845 | EXPECT_EQ(self->run.exception_error_code, 0); |
1846 | EXPECT_EQ(self->run.exception_addr, 0); |
1847 | |
1848 | /* |
1849 | * Read memory that was just written to, confirming that data |
1850 | * previously written (MAGIC) is present. |
1851 | */ |
1852 | get_addr_op.value = 0; |
1853 | get_addr_op.addr = data_start; |
1854 | get_addr_op.header.type = ENCL_OP_GET_FROM_ADDRESS; |
1855 | |
1856 | EXPECT_EQ(ENCL_CALL(&get_addr_op, &self->run, true), 0); |
1857 | |
1858 | EXPECT_EQ(get_addr_op.value, MAGIC); |
1859 | EXPECT_EEXIT(&self->run); |
1860 | EXPECT_EQ(self->run.exception_vector, 0); |
1861 | EXPECT_EQ(self->run.exception_error_code, 0); |
1862 | EXPECT_EQ(self->run.exception_addr, 0); |
1863 | |
1864 | /* Start page removal by requesting change of page type to PT_TRIM. */ |
1865 | memset(&ioc, 0, sizeof(ioc)); |
1866 | |
1867 | ioc.offset = encl_get_data_offset(encl: &self->encl) + PAGE_SIZE; |
1868 | ioc.length = PAGE_SIZE; |
1869 | ioc.page_type = SGX_PAGE_TYPE_TRIM; |
1870 | |
1871 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_MODIFY_TYPES, &ioc); |
1872 | errno_save = ret == -1 ? errno : 0; |
1873 | |
1874 | EXPECT_EQ(ret, 0); |
1875 | EXPECT_EQ(errno_save, 0); |
1876 | EXPECT_EQ(ioc.result, 0); |
1877 | EXPECT_EQ(ioc.count, 4096); |
1878 | |
1879 | eaccept_op.epc_addr = (unsigned long)data_start; |
1880 | eaccept_op.ret = 0; |
1881 | eaccept_op.flags = SGX_SECINFO_TRIM | SGX_SECINFO_MODIFIED; |
1882 | eaccept_op.header.type = ENCL_OP_EACCEPT; |
1883 | |
1884 | EXPECT_EQ(ENCL_CALL(&eaccept_op, &self->run, true), 0); |
1885 | |
1886 | EXPECT_EEXIT(&self->run); |
1887 | EXPECT_EQ(self->run.exception_vector, 0); |
1888 | EXPECT_EQ(self->run.exception_error_code, 0); |
1889 | EXPECT_EQ(self->run.exception_addr, 0); |
1890 | EXPECT_EQ(eaccept_op.ret, 0); |
1891 | |
1892 | /* Skip ioctl() to remove page. */ |
1893 | |
1894 | /* |
1895 | * Read from page that was just removed. |
1896 | */ |
1897 | get_addr_op.value = 0; |
1898 | |
1899 | EXPECT_EQ(ENCL_CALL(&get_addr_op, &self->run, true), 0); |
1900 | |
1901 | /* |
1902 | * From kernel perspective the page is present but according to SGX the |
1903 | * page should not be accessible so a #PF with SGX bit set is |
1904 | * expected. |
1905 | */ |
1906 | |
1907 | EXPECT_EQ(self->run.function, ERESUME); |
1908 | EXPECT_EQ(self->run.exception_vector, 14); |
1909 | EXPECT_EQ(self->run.exception_error_code, 0x8005); |
1910 | EXPECT_EQ(self->run.exception_addr, data_start); |
1911 | } |
1912 | |
1913 | TEST_F(enclave, remove_untouched_page) |
1914 | { |
1915 | struct sgx_enclave_remove_pages remove_ioc; |
1916 | struct sgx_enclave_modify_types modt_ioc; |
1917 | struct encl_op_eaccept eaccept_op; |
1918 | unsigned long data_start; |
1919 | int ret, errno_save; |
1920 | |
1921 | ASSERT_TRUE(setup_test_encl(ENCL_HEAP_SIZE_DEFAULT, &self->encl, _metadata)); |
1922 | |
1923 | /* |
1924 | * Hardware (SGX2) and kernel support is needed for this test. Start |
1925 | * with check that test has a chance of succeeding. |
1926 | */ |
1927 | memset(&modt_ioc, 0, sizeof(modt_ioc)); |
1928 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_MODIFY_TYPES, &modt_ioc); |
1929 | |
1930 | if (ret == -1) { |
1931 | if (errno == ENOTTY) |
1932 | SKIP(return, |
1933 | "Kernel does not support SGX_IOC_ENCLAVE_MODIFY_TYPES ioctl()" ); |
1934 | else if (errno == ENODEV) |
1935 | SKIP(return, "System does not support SGX2" ); |
1936 | } |
1937 | |
1938 | /* |
1939 | * Invalid parameters were provided during sanity check, |
1940 | * expect command to fail. |
1941 | */ |
1942 | EXPECT_EQ(ret, -1); |
1943 | |
1944 | /* SGX2 is supported by kernel and hardware, test can proceed. */ |
1945 | memset(&self->run, 0, sizeof(self->run)); |
1946 | self->run.tcs = self->encl.encl_base; |
1947 | |
1948 | data_start = self->encl.encl_base + |
1949 | encl_get_data_offset(encl: &self->encl) + PAGE_SIZE; |
1950 | |
1951 | memset(&modt_ioc, 0, sizeof(modt_ioc)); |
1952 | |
1953 | modt_ioc.offset = encl_get_data_offset(encl: &self->encl) + PAGE_SIZE; |
1954 | modt_ioc.length = PAGE_SIZE; |
1955 | modt_ioc.page_type = SGX_PAGE_TYPE_TRIM; |
1956 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_MODIFY_TYPES, &modt_ioc); |
1957 | errno_save = ret == -1 ? errno : 0; |
1958 | |
1959 | EXPECT_EQ(ret, 0); |
1960 | EXPECT_EQ(errno_save, 0); |
1961 | EXPECT_EQ(modt_ioc.result, 0); |
1962 | EXPECT_EQ(modt_ioc.count, 4096); |
1963 | |
1964 | /* |
1965 | * Enter enclave via TCS #1 and approve page removal by sending |
1966 | * EACCEPT for removed page. |
1967 | */ |
1968 | |
1969 | eaccept_op.epc_addr = data_start; |
1970 | eaccept_op.flags = SGX_SECINFO_TRIM | SGX_SECINFO_MODIFIED; |
1971 | eaccept_op.ret = 0; |
1972 | eaccept_op.header.type = ENCL_OP_EACCEPT; |
1973 | |
1974 | EXPECT_EQ(ENCL_CALL(&eaccept_op, &self->run, true), 0); |
1975 | EXPECT_EEXIT(&self->run); |
1976 | EXPECT_EQ(self->run.exception_vector, 0); |
1977 | EXPECT_EQ(self->run.exception_error_code, 0); |
1978 | EXPECT_EQ(self->run.exception_addr, 0); |
1979 | EXPECT_EQ(eaccept_op.ret, 0); |
1980 | |
1981 | memset(&remove_ioc, 0, sizeof(remove_ioc)); |
1982 | |
1983 | remove_ioc.offset = encl_get_data_offset(encl: &self->encl) + PAGE_SIZE; |
1984 | remove_ioc.length = PAGE_SIZE; |
1985 | ret = ioctl(self->encl.fd, SGX_IOC_ENCLAVE_REMOVE_PAGES, &remove_ioc); |
1986 | errno_save = ret == -1 ? errno : 0; |
1987 | |
1988 | EXPECT_EQ(ret, 0); |
1989 | EXPECT_EQ(errno_save, 0); |
1990 | EXPECT_EQ(remove_ioc.count, 4096); |
1991 | } |
1992 | |
1993 | TEST_HARNESS_MAIN |
1994 | |