9 #include <sys/resource.h>
13 struct vm_boundaries {
18 static int get_vm_area(unsigned long addr, struct vm_boundaries *area)
22 char line[1024] = {0};
31 file = fopen("/proc/self/maps", "r");
37 memset(area, 0, sizeof(struct vm_boundaries));
39 while(fgets(line, 1024, file)) {
40 end_addr = strchr(line, '-');
42 printf("cannot parse /proc/self/maps\n");
47 stop = strchr(end_addr, ' ');
49 printf("cannot parse /proc/self/maps\n");
54 sscanf(line, "%lx", &start);
55 sscanf(end_addr, "%lx", &end);
57 if (start <= addr && end > addr) {
69 static uint64_t get_pageflags(unsigned long addr)
75 file = fopen("/proc/self/pagemap", "r");
77 perror("fopen pagemap");
81 offset = addr / getpagesize() * sizeof(pfn);
83 if (fseek(file, offset, SEEK_SET)) {
84 perror("fseek pagemap");
88 if (fread(&pfn, sizeof(pfn), 1, file) != 1) {
89 perror("fread pagemap");
97 static uint64_t get_kpageflags(unsigned long pfn)
102 file = fopen("/proc/kpageflags", "r");
104 perror("fopen kpageflags");
108 if (fseek(file, pfn * sizeof(flags), SEEK_SET)) {
109 perror("fseek kpageflags");
113 if (fread(&flags, sizeof(flags), 1, file) != 1) {
114 perror("fread kpageflags");
122 static FILE *seek_to_smaps_entry(unsigned long addr)
127 unsigned long start, end;
129 unsigned long offset;
134 file = fopen("/proc/self/smaps", "r");
136 perror("fopen smaps");
140 while (getline(&line, &size, file) > 0) {
141 if (sscanf(line, "%lx-%lx %s %lx %s %lu %s\n",
142 &start, &end, perms, &offset, dev, &inode, path) < 6)
145 if (start <= addr && addr < end)
162 #define VMFLAGS "VmFlags:"
164 static bool is_vmflag_set(unsigned long addr, const char *vmflag)
172 smaps = seek_to_smaps_entry(addr);
174 printf("Unable to parse /proc/self/smaps\n");
178 while (getline(&line, &size, smaps) > 0) {
179 if (!strstr(line, VMFLAGS)) {
186 flags = line + strlen(VMFLAGS);
187 ret = (strstr(flags, vmflag) != NULL);
201 static bool is_vma_lock_on_fault(unsigned long addr)
206 unsigned long vma_size, vma_rss;
211 locked = is_vmflag_set(addr, LOCKED);
215 smaps = seek_to_smaps_entry(addr);
217 printf("Unable to parse /proc/self/smaps\n");
221 while (getline(&line, &size, smaps) > 0) {
222 if (!strstr(line, SIZE)) {
229 value = line + strlen(SIZE);
230 if (sscanf(value, "%lu kB", &vma_size) < 1) {
231 printf("Unable to parse smaps entry for Size\n");
237 while (getline(&line, &size, smaps) > 0) {
238 if (!strstr(line, RSS)) {
245 value = line + strlen(RSS);
246 if (sscanf(value, "%lu kB", &vma_rss) < 1) {
247 printf("Unable to parse smaps entry for Rss\n");
253 ret = locked && (vma_rss < vma_size);
261 #define PRESENT_BIT 0x8000000000000000ULL
262 #define PFN_MASK 0x007FFFFFFFFFFFFFULL
263 #define UNEVICTABLE_BIT (1UL << 18)
265 static int lock_check(char *map)
267 unsigned long page_size = getpagesize();
268 uint64_t page1_flags, page2_flags;
270 page1_flags = get_pageflags((unsigned long)map);
271 page2_flags = get_pageflags((unsigned long)map + page_size);
273 /* Both pages should be present */
274 if (((page1_flags & PRESENT_BIT) == 0) ||
275 ((page2_flags & PRESENT_BIT) == 0)) {
276 printf("Failed to make both pages present\n");
280 page1_flags = get_kpageflags(page1_flags & PFN_MASK);
281 page2_flags = get_kpageflags(page2_flags & PFN_MASK);
283 /* Both pages should be unevictable */
284 if (((page1_flags & UNEVICTABLE_BIT) == 0) ||
285 ((page2_flags & UNEVICTABLE_BIT) == 0)) {
286 printf("Failed to make both pages unevictable\n");
290 if (!is_vmflag_set((unsigned long)map, LOCKED)) {
291 printf("VMA flag %s is missing on page 1\n", LOCKED);
295 if (!is_vmflag_set((unsigned long)map + page_size, LOCKED)) {
296 printf("VMA flag %s is missing on page 2\n", LOCKED);
303 static int unlock_lock_check(char *map)
305 unsigned long page_size = getpagesize();
306 uint64_t page1_flags, page2_flags;
308 page1_flags = get_pageflags((unsigned long)map);
309 page2_flags = get_pageflags((unsigned long)map + page_size);
310 page1_flags = get_kpageflags(page1_flags & PFN_MASK);
311 page2_flags = get_kpageflags(page2_flags & PFN_MASK);
313 if ((page1_flags & UNEVICTABLE_BIT) || (page2_flags & UNEVICTABLE_BIT)) {
314 printf("A page is still marked unevictable after unlock\n");
318 if (is_vmflag_set((unsigned long)map, LOCKED)) {
319 printf("VMA flag %s is present on page 1 after unlock\n", LOCKED);
323 if (is_vmflag_set((unsigned long)map + page_size, LOCKED)) {
324 printf("VMA flag %s is present on page 2 after unlock\n", LOCKED);
331 static int test_mlock_lock()
335 unsigned long page_size = getpagesize();
337 map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE,
338 MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
339 if (map == MAP_FAILED) {
340 perror("test_mlock_locked mmap");
344 if (mlock2_(map, 2 * page_size, 0)) {
345 if (errno == ENOSYS) {
346 printf("Cannot call new mlock family, skipping test\n");
356 /* Now unlock and recheck attributes */
357 if (munlock(map, 2 * page_size)) {
362 ret = unlock_lock_check(map);
365 munmap(map, 2 * page_size);
370 static int onfault_check(char *map)
372 unsigned long page_size = getpagesize();
373 uint64_t page1_flags, page2_flags;
375 page1_flags = get_pageflags((unsigned long)map);
376 page2_flags = get_pageflags((unsigned long)map + page_size);
378 /* Neither page should be present */
379 if ((page1_flags & PRESENT_BIT) || (page2_flags & PRESENT_BIT)) {
380 printf("Pages were made present by MLOCK_ONFAULT\n");
385 page1_flags = get_pageflags((unsigned long)map);
386 page2_flags = get_pageflags((unsigned long)map + page_size);
388 /* Only page 1 should be present */
389 if ((page1_flags & PRESENT_BIT) == 0) {
390 printf("Page 1 is not present after fault\n");
392 } else if (page2_flags & PRESENT_BIT) {
393 printf("Page 2 was made present\n");
397 page1_flags = get_kpageflags(page1_flags & PFN_MASK);
399 /* Page 1 should be unevictable */
400 if ((page1_flags & UNEVICTABLE_BIT) == 0) {
401 printf("Failed to make faulted page unevictable\n");
405 if (!is_vma_lock_on_fault((unsigned long)map)) {
406 printf("VMA is not marked for lock on fault\n");
410 if (!is_vma_lock_on_fault((unsigned long)map + page_size)) {
411 printf("VMA is not marked for lock on fault\n");
418 static int unlock_onfault_check(char *map)
420 unsigned long page_size = getpagesize();
421 uint64_t page1_flags;
423 page1_flags = get_pageflags((unsigned long)map);
424 page1_flags = get_kpageflags(page1_flags & PFN_MASK);
426 if (page1_flags & UNEVICTABLE_BIT) {
427 printf("Page 1 is still marked unevictable after unlock\n");
431 if (is_vma_lock_on_fault((unsigned long)map) ||
432 is_vma_lock_on_fault((unsigned long)map + page_size)) {
433 printf("VMA is still lock on fault after unlock\n");
440 static int test_mlock_onfault()
444 unsigned long page_size = getpagesize();
446 map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE,
447 MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
448 if (map == MAP_FAILED) {
449 perror("test_mlock_locked mmap");
453 if (mlock2_(map, 2 * page_size, MLOCK_ONFAULT)) {
454 if (errno == ENOSYS) {
455 printf("Cannot call new mlock family, skipping test\n");
458 perror("mlock2(MLOCK_ONFAULT)");
462 if (onfault_check(map))
465 /* Now unlock and recheck attributes */
466 if (munlock(map, 2 * page_size)) {
467 if (errno == ENOSYS) {
468 printf("Cannot call new mlock family, skipping test\n");
475 ret = unlock_onfault_check(map);
477 munmap(map, 2 * page_size);
482 static int test_lock_onfault_of_present()
486 unsigned long page_size = getpagesize();
487 uint64_t page1_flags, page2_flags;
489 map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE,
490 MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
491 if (map == MAP_FAILED) {
492 perror("test_mlock_locked mmap");
498 if (mlock2_(map, 2 * page_size, MLOCK_ONFAULT)) {
499 if (errno == ENOSYS) {
500 printf("Cannot call new mlock family, skipping test\n");
503 perror("mlock2(MLOCK_ONFAULT)");
507 page1_flags = get_pageflags((unsigned long)map);
508 page2_flags = get_pageflags((unsigned long)map + page_size);
509 page1_flags = get_kpageflags(page1_flags & PFN_MASK);
510 page2_flags = get_kpageflags(page2_flags & PFN_MASK);
512 /* Page 1 should be unevictable */
513 if ((page1_flags & UNEVICTABLE_BIT) == 0) {
514 printf("Failed to make present page unevictable\n");
518 if (!is_vma_lock_on_fault((unsigned long)map) ||
519 !is_vma_lock_on_fault((unsigned long)map + page_size)) {
520 printf("VMA with present pages is not marked lock on fault\n");
525 munmap(map, 2 * page_size);
530 static int test_munlockall()
534 unsigned long page_size = getpagesize();
536 map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE,
537 MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
539 if (map == MAP_FAILED) {
540 perror("test_munlockall mmap");
544 if (mlockall(MCL_CURRENT)) {
545 perror("mlockall(MCL_CURRENT)");
553 perror("munlockall()");
557 if (unlock_lock_check(map))
560 munmap(map, 2 * page_size);
562 map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE,
563 MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
565 if (map == MAP_FAILED) {
566 perror("test_munlockall second mmap");
570 if (mlockall(MCL_CURRENT | MCL_ONFAULT)) {
571 perror("mlockall(MCL_CURRENT | MCL_ONFAULT)");
575 if (onfault_check(map))
579 perror("munlockall()");
583 if (unlock_onfault_check(map))
586 if (mlockall(MCL_CURRENT | MCL_FUTURE)) {
587 perror("mlockall(MCL_CURRENT | MCL_FUTURE)");
595 perror("munlockall()");
599 ret = unlock_lock_check(map);
602 munmap(map, 2 * page_size);
608 static int test_vma_management(bool call_mlock)
612 unsigned long page_size = getpagesize();
613 struct vm_boundaries page1;
614 struct vm_boundaries page2;
615 struct vm_boundaries page3;
617 map = mmap(NULL, 3 * page_size, PROT_READ | PROT_WRITE,
618 MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
619 if (map == MAP_FAILED) {
624 if (call_mlock && mlock2_(map, 3 * page_size, MLOCK_ONFAULT)) {
625 if (errno == ENOSYS) {
626 printf("Cannot call new mlock family, skipping test\n");
629 perror("mlock(ONFAULT)\n");
633 if (get_vm_area((unsigned long)map, &page1) ||
634 get_vm_area((unsigned long)map + page_size, &page2) ||
635 get_vm_area((unsigned long)map + page_size * 2, &page3)) {
636 printf("couldn't find mapping in /proc/self/maps\n");
641 * Before we unlock a portion, we need to that all three pages are in
642 * the same VMA. If they are not we abort this test (Note that this is
645 if (page1.start != page2.start || page2.start != page3.start) {
646 printf("VMAs are not merged to start, aborting test\n");
651 if (munlock(map + page_size, page_size)) {
656 if (get_vm_area((unsigned long)map, &page1) ||
657 get_vm_area((unsigned long)map + page_size, &page2) ||
658 get_vm_area((unsigned long)map + page_size * 2, &page3)) {
659 printf("couldn't find mapping in /proc/self/maps\n");
663 /* All three VMAs should be different */
664 if (page1.start == page2.start || page2.start == page3.start) {
665 printf("failed to split VMA for munlock\n");
669 /* Now unlock the first and third page and check the VMAs again */
670 if (munlock(map, page_size * 3)) {
675 if (get_vm_area((unsigned long)map, &page1) ||
676 get_vm_area((unsigned long)map + page_size, &page2) ||
677 get_vm_area((unsigned long)map + page_size * 2, &page3)) {
678 printf("couldn't find mapping in /proc/self/maps\n");
682 /* Now all three VMAs should be the same */
683 if (page1.start != page2.start || page2.start != page3.start) {
684 printf("failed to merge VMAs after munlock\n");
690 munmap(map, 3 * page_size);
694 static int test_mlockall(int (test_function)(bool call_mlock))
698 if (mlockall(MCL_CURRENT | MCL_ONFAULT | MCL_FUTURE)) {
703 ret = test_function(false);
708 int main(int argc, char **argv)
711 ret += test_mlock_lock();
712 ret += test_mlock_onfault();
713 ret += test_munlockall();
714 ret += test_lock_onfault_of_present();
715 ret += test_vma_management(true);
716 ret += test_mlockall(test_vma_management);