selftests/x86/ldt_gdt.c

142 	struct user_desc desc = *d;
152 		desc.entry_number = gdt_entry_num;
154 		ret = syscall(SYS_set_thread_area, &desc);
157 			      &desc, sizeof(desc));
169 		uint32_t limit = desc.limit;
170 		if (desc.limit_in_pages)
172 		check_valid_segment(desc.entry_number, ldt, ar, limit, true);
175 		if (desc.seg_32bit) {
189 static bool install_valid(const struct user_desc *desc, uint32_t ar)
191 	bool ret = install_valid_mode(desc, ar, false, true);
193 	if (desc->contents <= 1 && desc->seg_32bit &&
194 	    !desc->seg_not_present) {
196 		install_valid_mode(desc, ar, false, false);
202 static void install_invalid(const struct user_desc *desc, bool oldmode)
205 			  desc, sizeof(*desc));
209 		check_invalid_segment(desc->entry_number, 1);
213 		if (desc->seg_32bit) {
232 static void fail_install(struct user_desc *desc)
234 	if (safe_modify_ldt(0x11, desc, sizeof(*desc)) == 0) {
246 	struct user_desc desc = {
257 	install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE | AR_S | AR_P | AR_DB);
259 	desc.limit_in_pages = 1;
260 	install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE |
265 	desc.entry_number = 2;
266 	install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE |
271 	desc.base_addr = 0xf0000000;
272 	install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE |
275 	desc.useable = 1;
276 	install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE |
279 	desc.seg_not_present = 1;
280 	install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE |
283 	desc.seg_32bit = 0;
284 	install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE |
287 	desc.seg_32bit = 1;
288 	desc.contents = 0;
289 	install_valid(&desc, AR_DPL3 | AR_TYPE_RWDATA |
292 	desc.read_exec_only = 1;
293 	install_valid(&desc, AR_DPL3 | AR_TYPE_RODATA |
296 	desc.contents = 1;
297 	install_valid(&desc, AR_DPL3 | AR_TYPE_RODATA_EXPDOWN |
300 	desc.read_exec_only = 0;
301 	desc.limit_in_pages = 0;
302 	install_valid(&desc, AR_DPL3 | AR_TYPE_RWDATA_EXPDOWN |
305 	desc.contents = 3;
306 	install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE_CONF |
309 	desc.read_exec_only = 1;
310 	install_valid(&desc, AR_DPL3 | AR_TYPE_XOCODE_CONF |
313 	desc.read_exec_only = 0;
314 	desc.contents = 2;
315 	install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE |
318 	desc.read_exec_only = 1;
321 	desc.lm = 1;
322 	install_valid(&desc, AR_DPL3 | AR_TYPE_XOCODE |
324 	desc.lm = 0;
327 	bool entry1_okay = install_valid(&desc, AR_DPL3 | AR_TYPE_XOCODE |
335 			check_valid_segment(desc.entry_number, 1,
337 					    AR_S | AR_DB | AR_AVL, desc.limit,
358 			desc.entry_number = i;
359 			desc.limit = i;
360 			if (safe_modify_ldt(0x11, &desc, sizeof(desc)) != 0) {
376 	desc.entry_number = 8192;
377 	fail_install(&desc);
380 	memset(&desc, 0, sizeof(desc));
381 	install_valid(&desc, AR_DPL3 | AR_TYPE_RWDATA | AR_S | AR_P);
383 	desc.seg_not_present = 1;
384 	install_valid(&desc, AR_DPL3 | AR_TYPE_RWDATA | AR_S);
386 	desc.seg_not_present = 0;
387 	desc.read_exec_only = 1;
388 	install_valid(&desc, AR_DPL3 | AR_TYPE_RODATA | AR_S | AR_P);
390 	desc.read_exec_only = 0;
391 	desc.seg_not_present = 1;
392 	install_valid(&desc, AR_DPL3 | AR_TYPE_RWDATA | AR_S);
394 	desc.read_exec_only = 1;
395 	desc.limit = 1;
396 	install_valid(&desc, AR_DPL3 | AR_TYPE_RODATA | AR_S);
398 	desc.limit = 0;
399 	desc.base_addr = 1;
400 	install_valid(&desc, AR_DPL3 | AR_TYPE_RODATA | AR_S);
402 	desc.base_addr = 0;
403 	install_invalid(&desc, false);
405 	desc.seg_not_present = 0;
406 	desc.seg_32bit = 1;
407 	desc.read_exec_only = 0;
408 	desc.limit = 0xfffff;
410 	install_valid(&desc, AR_DPL3 | AR_TYPE_RWDATA | AR_S | AR_P | AR_DB);
412 	desc.limit_in_pages = 1;
414 	install_valid(&desc, AR_DPL3 | AR_TYPE_RWDATA | AR_S | AR_P | AR_DB | AR_G);
415 	desc.read_exec_only = 1;
416 	install_valid(&desc, AR_DPL3 | AR_TYPE_RODATA | AR_S | AR_P | AR_DB | AR_G);
417 	desc.contents = 1;
418 	desc.read_exec_only = 0;
419 	install_valid(&desc, AR_DPL3 | AR_TYPE_RWDATA_EXPDOWN | AR_S | AR_P | AR_DB | AR_G);
420 	desc.read_exec_only = 1;
421 	install_valid(&desc, AR_DPL3 | AR_TYPE_RODATA_EXPDOWN | AR_S | AR_P | AR_DB | AR_G);
423 	desc.limit = 0;
424 	install_invalid(&desc, true);
451 		const struct user_desc desc = {};
452 		if (syscall(SYS_modify_ldt, 1, &desc, sizeof(desc)) != 0)
572 		struct user_desc desc = {
584 		if (safe_modify_ldt(0x11, &desc, sizeof(desc)) != 0) {
641 	struct user_desc desc = {
652 	install_valid(&desc, AR_DPL3 | AR_TYPE_XRCODE | AR_S | AR_P | AR_DB);