17  * Fork and exec tiny 1 page executable which precisely controls its VM.
56 	if (unshare(CLONE_NEWNS) == -1) {  in make_private_tmp()
60 		exit(1);  in make_private_tmp()
62 	if (mount(NULL, "/", NULL, MS_PRIVATE|MS_REC, NULL) == -1) {  in make_private_tmp()
63 		exit(1);  in make_private_tmp()
65 	if (mount(NULL, "/tmp", "tmpfs", 0, NULL) == -1) {  in make_private_tmp()
66 		exit(1);  in make_private_tmp()
70 static pid_t pid = -1;
108 #define VADDR (1UL << 32)
129 	mov_rsi((1ULL << 47) - 4096 - VADDR - 4096),
134 	/* write(0, &c, 1); */
137 	0xba, 0x01, 0x00, 0x00, 0x00,			/* mov edx, 1 */
138 	mov_eax(1),
141 	/* 1: pause(); */
145 	0xeb, 0xf7,	/* jmp 1b */
163 	h.e_ident[1] = 'E';  in make_exe()
167 	h.e_ident[5] = 1;  in make_exe()
168 	h.e_ident[6] = 1;  in make_exe()
172 	h.e_version = 1;  in make_exe()
179 	h.e_phnum = 1;  in make_exe()
185 	ph.p_type = 1;  in make_exe()
186 	ph.p_flags = (1<<2)|1;  in make_exe()
195 	if (fd == -1) {  in make_exe()
196 		exit(1);  in make_exe()
200 		exit(1);  in make_exe()
220 	_exit(1);  in sigaction_SIGSEGV()
234 		exit(1);  in vsyscall()
267 	/* Reserve fd 0 for 1-byte pipe ping from child. */  in main()
270 		return 1;  in main()
275 	if (pipe(pipefd) == -1) {  in main()
276 		return 1;  in main()
278 	if (dup2(pipefd[1], 0) != 0) {  in main()
279 		return 1;  in main()
283 	if (pid == -1) {  in main()
284 		return 1;  in main()
288 		return 1;  in main()
292 	if (read(pipefd[0], &_, 1) != 1) {  in main()
293 		return 1;  in main()
297 	if (fstat(exec_fd, &st) == -1) {  in main()
298 		return 1;  in main()
322 		if (fd == -1) {  in main()
323 			return 1;  in main()
341 		if (fd == -1) {  in main()
342 			return 1;  in main()
350 #define RSS1 "Rss:                   4 kB\n"  in main()
351 #define RSS2 "Rss:                   0 kB\n"  in main()
352 #define PSS1 "Pss:                   4 kB\n"  in main()
353 #define PSS2 "Pss:                   0 kB\n"  in main()
360 			"Size:                  4 kB\n",  in main()
361 			"KernelPageSize:        4 kB\n",  in main()
362 			"MMUPageSize:           4 kB\n",  in main()
363 			"Anonymous:             0 kB\n",  in main()
364 			"AnonHugePages:         0 kB\n",  in main()
365 			"Shared_Hugetlb:        0 kB\n",  in main()
366 			"Private_Hugetlb:       0 kB\n",  in main()
367 			"Locked:                0 kB\n",  in main()
397 		if (fd == -1) {  in main()
398 			return 1;  in main()
412 			"Anonymous:             0 kB\n",  in main()
413 			"AnonHugePages:         0 kB\n",  in main()
414 			"Shared_Hugetlb:        0 kB\n",  in main()
415 			"Private_Hugetlb:       0 kB\n",  in main()
416 			"Locked:                0 kB\n",  in main()
433 		if (fd == -1) {  in main()
434 			return 1;  in main()
439 		assert(buf[0] == '1');	/* ->total_vm */  in main()
440 		assert(buf[1] == ' ');  in main()
441 		assert(buf[2] == '0' || buf[2] == '1');	/* rss */  in main()
443 		assert(buf[4] == '0' || buf[2] == '1');	/* file rss */  in main()
445 		assert(buf[6] == '1');	/* ELF executable segments */  in main()