17  * Fork and exec tiny 1 page executable which precisely controls its VM.
59 	if (unshare(CLONE_NEWNS) == -1) {  in make_private_tmp()
63 		exit(1);  in make_private_tmp()
65 	if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) == -1) {  in make_private_tmp()
66 		exit(1);  in make_private_tmp()
68 	if (mount(NULL, "/tmp", "tmpfs", 0, NULL) == -1) {  in make_private_tmp()
69 		exit(1);  in make_private_tmp()
73 static pid_t pid = -1;
111 #define VADDR (1UL << 32)
132 	mov_rsi((1ULL << 47) - 4096 - VADDR - 4096),
137 	/* write(0, &c, 1); */
140 	0xba, 0x01, 0x00, 0x00, 0x00,			/* mov edx, 1 */
141 	mov_eax(1),
144 	/* 1: pause(); */
148 	0xeb, 0xf7,	/* jmp 1b */
166 	h.e_ident[1] = 'E';  in make_exe()
170 	h.e_ident[5] = 1;  in make_exe()
171 	h.e_ident[6] = 1;  in make_exe()
175 	h.e_version = 1;  in make_exe()
182 	h.e_phnum = 1;  in make_exe()
188 	ph.p_type = 1;  in make_exe()
189 	ph.p_flags = (1<<2)|1;  in make_exe()
198 	if (fd == -1) {  in make_exe()
199 		exit(1);  in make_exe()
203 		exit(1);  in make_exe()
217  * 1: vsyscall VMA is --xp		vsyscall=xonly
246 		exit(1);  in vsyscall()
269 		g_vsyscall = 1;  in vsyscall()
280 		exit(1);  in vsyscall()
294 	case 1:  in main()
308 	/* Reserve fd 0 for 1-byte pipe ping from child. */  in main()
311 		return 1;  in main()
316 	if (pipe(pipefd) == -1) {  in main()
317 		return 1;  in main()
319 	if (dup2(pipefd[1], 0) != 0) {  in main()
320 		return 1;  in main()
324 	if (pid == -1) {  in main()
325 		return 1;  in main()
329 		return 1;  in main()
333 	if (read(pipefd[0], &_, 1) != 1) {  in main()
334 		return 1;  in main()
338 	if (fstat(exec_fd, &st) == -1) {  in main()
339 		return 1;  in main()
363 		if (fd == -1) {  in main()
364 			return 1;  in main()
382 		if (fd == -1) {  in main()
383 			return 1;  in main()
391 #define RSS1 "Rss:                   4 kB\n"  in main()
392 #define RSS2 "Rss:                   0 kB\n"  in main()
393 #define PSS1 "Pss:                   4 kB\n"  in main()
394 #define PSS2 "Pss:                   0 kB\n"  in main()
401 			"Size:                  4 kB\n",  in main()
402 			"KernelPageSize:        4 kB\n",  in main()
403 			"MMUPageSize:           4 kB\n",  in main()
404 			"Anonymous:             0 kB\n",  in main()
405 			"AnonHugePages:         0 kB\n",  in main()
406 			"Shared_Hugetlb:        0 kB\n",  in main()
407 			"Private_Hugetlb:       0 kB\n",  in main()
408 			"Locked:                0 kB\n",  in main()
438 		if (fd == -1) {  in main()
439 			return 1;  in main()
453 			"Anonymous:             0 kB\n",  in main()
454 			"AnonHugePages:         0 kB\n",  in main()
455 			"Shared_Hugetlb:        0 kB\n",  in main()
456 			"Private_Hugetlb:       0 kB\n",  in main()
457 			"Locked:                0 kB\n",  in main()
474 		if (fd == -1) {  in main()
475 			return 1;  in main()
480 		assert(buf[0] == '1');	/* ->total_vm */  in main()
481 		assert(buf[1] == ' ');  in main()
482 		assert(buf[2] == '0' || buf[2] == '1');	/* rss */  in main()
484 		assert(buf[4] == '0' || buf[2] == '1');	/* file rss */  in main()
486 		assert(buf[6] == '1');	/* ELF executable segments */  in main()
504 		if (fd == -1)  in main()
505 			return 1;  in main()
507 		/* CASE 1: exact MATCH at VADDR */  in main()
533 		assert(q.vma_name_size == strlen(exp_path_buf) + 1);  in main()
536 		/* CASE 2: NO MATCH at VADDR-1 */  in main()
539 		q.query_addr = VADDR - 1;  in main()
546 		/* CASE 3: MATCH COVERING_OR_NEXT_VMA at VADDR - 1 */  in main()
549 		q.query_addr = VADDR - 1;  in main()
555 		assert(q.query_addr == VADDR - 1);  in main()