521 lines
10 KiB
C
521 lines
10 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
#define _GNU_SOURCE
|
||
|
|
#include <sys/mman.h>
|
||
|
|
#include <stdint.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <sys/time.h>
|
||
|
|
#include <sys/resource.h>
|
||
|
|
#include <stdbool.h>
|
||
|
|
#include "mlock2.h"
|
||
|
|
|
||
|
|
#include "../kselftest.h"
|
||
|
|
|
||
|
|
struct vm_boundaries {
|
||
|
|
unsigned long start;
|
||
|
|
unsigned long end;
|
||
|
|
};
|
||
|
|
|
||
|
|
static int get_vm_area(unsigned long addr, struct vm_boundaries *area)
|
||
|
|
{
|
||
|
|
FILE *file;
|
||
|
|
int ret = 1;
|
||
|
|
char line[1024] = {0};
|
||
|
|
char *end_addr;
|
||
|
|
char *stop;
|
||
|
|
unsigned long start;
|
||
|
|
unsigned long end;
|
||
|
|
|
||
|
|
if (!area)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
file = fopen("/proc/self/maps", "r");
|
||
|
|
if (!file) {
|
||
|
|
perror("fopen");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
memset(area, 0, sizeof(struct vm_boundaries));
|
||
|
|
|
||
|
|
while(fgets(line, 1024, file)) {
|
||
|
|
end_addr = strchr(line, '-');
|
||
|
|
if (!end_addr) {
|
||
|
|
printf("cannot parse /proc/self/maps\n");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
*end_addr = '\0';
|
||
|
|
end_addr++;
|
||
|
|
stop = strchr(end_addr, ' ');
|
||
|
|
if (!stop) {
|
||
|
|
printf("cannot parse /proc/self/maps\n");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
stop = '\0';
|
||
|
|
|
||
|
|
sscanf(line, "%lx", &start);
|
||
|
|
sscanf(end_addr, "%lx", &end);
|
||
|
|
|
||
|
|
if (start <= addr && end > addr) {
|
||
|
|
area->start = start;
|
||
|
|
area->end = end;
|
||
|
|
ret = 0;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
out:
|
||
|
|
fclose(file);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define VMFLAGS "VmFlags:"
|
||
|
|
|
||
|
|
static bool is_vmflag_set(unsigned long addr, const char *vmflag)
|
||
|
|
{
|
||
|
|
char *line = NULL;
|
||
|
|
char *flags;
|
||
|
|
size_t size = 0;
|
||
|
|
bool ret = false;
|
||
|
|
FILE *smaps;
|
||
|
|
|
||
|
|
smaps = seek_to_smaps_entry(addr);
|
||
|
|
if (!smaps) {
|
||
|
|
printf("Unable to parse /proc/self/smaps\n");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
while (getline(&line, &size, smaps) > 0) {
|
||
|
|
if (!strstr(line, VMFLAGS)) {
|
||
|
|
free(line);
|
||
|
|
line = NULL;
|
||
|
|
size = 0;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
flags = line + strlen(VMFLAGS);
|
||
|
|
ret = (strstr(flags, vmflag) != NULL);
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
out:
|
||
|
|
free(line);
|
||
|
|
fclose(smaps);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define SIZE "Size:"
|
||
|
|
#define RSS "Rss:"
|
||
|
|
#define LOCKED "lo"
|
||
|
|
|
||
|
|
static unsigned long get_value_for_name(unsigned long addr, const char *name)
|
||
|
|
{
|
||
|
|
char *line = NULL;
|
||
|
|
size_t size = 0;
|
||
|
|
char *value_ptr;
|
||
|
|
FILE *smaps = NULL;
|
||
|
|
unsigned long value = -1UL;
|
||
|
|
|
||
|
|
smaps = seek_to_smaps_entry(addr);
|
||
|
|
if (!smaps) {
|
||
|
|
printf("Unable to parse /proc/self/smaps\n");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
while (getline(&line, &size, smaps) > 0) {
|
||
|
|
if (!strstr(line, name)) {
|
||
|
|
free(line);
|
||
|
|
line = NULL;
|
||
|
|
size = 0;
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
|
||
|
|
value_ptr = line + strlen(name);
|
||
|
|
if (sscanf(value_ptr, "%lu kB", &value) < 1) {
|
||
|
|
printf("Unable to parse smaps entry for Size\n");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
out:
|
||
|
|
if (smaps)
|
||
|
|
fclose(smaps);
|
||
|
|
free(line);
|
||
|
|
return value;
|
||
|
|
}
|
||
|
|
|
||
|
|
static bool is_vma_lock_on_fault(unsigned long addr)
|
||
|
|
{
|
||
|
|
bool locked;
|
||
|
|
unsigned long vma_size, vma_rss;
|
||
|
|
|
||
|
|
locked = is_vmflag_set(addr, LOCKED);
|
||
|
|
if (!locked)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
vma_size = get_value_for_name(addr, SIZE);
|
||
|
|
vma_rss = get_value_for_name(addr, RSS);
|
||
|
|
|
||
|
|
/* only one page is faulted in */
|
||
|
|
return (vma_rss < vma_size);
|
||
|
|
}
|
||
|
|
|
||
|
|
#define PRESENT_BIT 0x8000000000000000ULL
|
||
|
|
#define PFN_MASK 0x007FFFFFFFFFFFFFULL
|
||
|
|
#define UNEVICTABLE_BIT (1UL << 18)
|
||
|
|
|
||
|
|
static int lock_check(unsigned long addr)
|
||
|
|
{
|
||
|
|
bool locked;
|
||
|
|
unsigned long vma_size, vma_rss;
|
||
|
|
|
||
|
|
locked = is_vmflag_set(addr, LOCKED);
|
||
|
|
if (!locked)
|
||
|
|
return false;
|
||
|
|
|
||
|
|
vma_size = get_value_for_name(addr, SIZE);
|
||
|
|
vma_rss = get_value_for_name(addr, RSS);
|
||
|
|
|
||
|
|
return (vma_rss == vma_size);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int unlock_lock_check(char *map)
|
||
|
|
{
|
||
|
|
if (is_vmflag_set((unsigned long)map, LOCKED)) {
|
||
|
|
printf("VMA flag %s is present on page 1 after unlock\n", LOCKED);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int test_mlock_lock()
|
||
|
|
{
|
||
|
|
char *map;
|
||
|
|
int ret = 1;
|
||
|
|
unsigned long page_size = getpagesize();
|
||
|
|
|
||
|
|
map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE,
|
||
|
|
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
|
||
|
|
if (map == MAP_FAILED) {
|
||
|
|
perror("test_mlock_locked mmap");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (mlock2_(map, 2 * page_size, 0)) {
|
||
|
|
if (errno == ENOSYS) {
|
||
|
|
printf("Cannot call new mlock family, skipping test\n");
|
||
|
|
_exit(KSFT_SKIP);
|
||
|
|
}
|
||
|
|
perror("mlock2(0)");
|
||
|
|
goto unmap;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!lock_check((unsigned long)map))
|
||
|
|
goto unmap;
|
||
|
|
|
||
|
|
/* Now unlock and recheck attributes */
|
||
|
|
if (munlock(map, 2 * page_size)) {
|
||
|
|
perror("munlock()");
|
||
|
|
goto unmap;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = unlock_lock_check(map);
|
||
|
|
|
||
|
|
unmap:
|
||
|
|
munmap(map, 2 * page_size);
|
||
|
|
out:
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int onfault_check(char *map)
|
||
|
|
{
|
||
|
|
*map = 'a';
|
||
|
|
if (!is_vma_lock_on_fault((unsigned long)map)) {
|
||
|
|
printf("VMA is not marked for lock on fault\n");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int unlock_onfault_check(char *map)
|
||
|
|
{
|
||
|
|
unsigned long page_size = getpagesize();
|
||
|
|
|
||
|
|
if (is_vma_lock_on_fault((unsigned long)map) ||
|
||
|
|
is_vma_lock_on_fault((unsigned long)map + page_size)) {
|
||
|
|
printf("VMA is still lock on fault after unlock\n");
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int test_mlock_onfault()
|
||
|
|
{
|
||
|
|
char *map;
|
||
|
|
int ret = 1;
|
||
|
|
unsigned long page_size = getpagesize();
|
||
|
|
|
||
|
|
map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE,
|
||
|
|
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
|
||
|
|
if (map == MAP_FAILED) {
|
||
|
|
perror("test_mlock_locked mmap");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (mlock2_(map, 2 * page_size, MLOCK_ONFAULT)) {
|
||
|
|
if (errno == ENOSYS) {
|
||
|
|
printf("Cannot call new mlock family, skipping test\n");
|
||
|
|
_exit(KSFT_SKIP);
|
||
|
|
}
|
||
|
|
perror("mlock2(MLOCK_ONFAULT)");
|
||
|
|
goto unmap;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (onfault_check(map))
|
||
|
|
goto unmap;
|
||
|
|
|
||
|
|
/* Now unlock and recheck attributes */
|
||
|
|
if (munlock(map, 2 * page_size)) {
|
||
|
|
if (errno == ENOSYS) {
|
||
|
|
printf("Cannot call new mlock family, skipping test\n");
|
||
|
|
_exit(KSFT_SKIP);
|
||
|
|
}
|
||
|
|
perror("munlock()");
|
||
|
|
goto unmap;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = unlock_onfault_check(map);
|
||
|
|
unmap:
|
||
|
|
munmap(map, 2 * page_size);
|
||
|
|
out:
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int test_lock_onfault_of_present()
|
||
|
|
{
|
||
|
|
char *map;
|
||
|
|
int ret = 1;
|
||
|
|
unsigned long page_size = getpagesize();
|
||
|
|
|
||
|
|
map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE,
|
||
|
|
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
|
||
|
|
if (map == MAP_FAILED) {
|
||
|
|
perror("test_mlock_locked mmap");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
*map = 'a';
|
||
|
|
|
||
|
|
if (mlock2_(map, 2 * page_size, MLOCK_ONFAULT)) {
|
||
|
|
if (errno == ENOSYS) {
|
||
|
|
printf("Cannot call new mlock family, skipping test\n");
|
||
|
|
_exit(KSFT_SKIP);
|
||
|
|
}
|
||
|
|
perror("mlock2(MLOCK_ONFAULT)");
|
||
|
|
goto unmap;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!is_vma_lock_on_fault((unsigned long)map) ||
|
||
|
|
!is_vma_lock_on_fault((unsigned long)map + page_size)) {
|
||
|
|
printf("VMA with present pages is not marked lock on fault\n");
|
||
|
|
goto unmap;
|
||
|
|
}
|
||
|
|
ret = 0;
|
||
|
|
unmap:
|
||
|
|
munmap(map, 2 * page_size);
|
||
|
|
out:
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int test_munlockall()
|
||
|
|
{
|
||
|
|
char *map;
|
||
|
|
int ret = 1;
|
||
|
|
unsigned long page_size = getpagesize();
|
||
|
|
|
||
|
|
map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE,
|
||
|
|
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
|
||
|
|
|
||
|
|
if (map == MAP_FAILED) {
|
||
|
|
perror("test_munlockall mmap");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (mlockall(MCL_CURRENT)) {
|
||
|
|
perror("mlockall(MCL_CURRENT)");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!lock_check((unsigned long)map))
|
||
|
|
goto unmap;
|
||
|
|
|
||
|
|
if (munlockall()) {
|
||
|
|
perror("munlockall()");
|
||
|
|
goto unmap;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (unlock_lock_check(map))
|
||
|
|
goto unmap;
|
||
|
|
|
||
|
|
munmap(map, 2 * page_size);
|
||
|
|
|
||
|
|
map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE,
|
||
|
|
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
|
||
|
|
|
||
|
|
if (map == MAP_FAILED) {
|
||
|
|
perror("test_munlockall second mmap");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (mlockall(MCL_CURRENT | MCL_ONFAULT)) {
|
||
|
|
perror("mlockall(MCL_CURRENT | MCL_ONFAULT)");
|
||
|
|
goto unmap;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (onfault_check(map))
|
||
|
|
goto unmap;
|
||
|
|
|
||
|
|
if (munlockall()) {
|
||
|
|
perror("munlockall()");
|
||
|
|
goto unmap;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (unlock_onfault_check(map))
|
||
|
|
goto unmap;
|
||
|
|
|
||
|
|
if (mlockall(MCL_CURRENT | MCL_FUTURE)) {
|
||
|
|
perror("mlockall(MCL_CURRENT | MCL_FUTURE)");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!lock_check((unsigned long)map))
|
||
|
|
goto unmap;
|
||
|
|
|
||
|
|
if (munlockall()) {
|
||
|
|
perror("munlockall()");
|
||
|
|
goto unmap;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = unlock_lock_check(map);
|
||
|
|
|
||
|
|
unmap:
|
||
|
|
munmap(map, 2 * page_size);
|
||
|
|
out:
|
||
|
|
munlockall();
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int test_vma_management(bool call_mlock)
|
||
|
|
{
|
||
|
|
int ret = 1;
|
||
|
|
void *map;
|
||
|
|
unsigned long page_size = getpagesize();
|
||
|
|
struct vm_boundaries page1;
|
||
|
|
struct vm_boundaries page2;
|
||
|
|
struct vm_boundaries page3;
|
||
|
|
|
||
|
|
map = mmap(NULL, 3 * page_size, PROT_READ | PROT_WRITE,
|
||
|
|
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
|
||
|
|
if (map == MAP_FAILED) {
|
||
|
|
perror("mmap()");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (call_mlock && mlock2_(map, 3 * page_size, MLOCK_ONFAULT)) {
|
||
|
|
if (errno == ENOSYS) {
|
||
|
|
printf("Cannot call new mlock family, skipping test\n");
|
||
|
|
_exit(KSFT_SKIP);
|
||
|
|
}
|
||
|
|
perror("mlock(ONFAULT)\n");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (get_vm_area((unsigned long)map, &page1) ||
|
||
|
|
get_vm_area((unsigned long)map + page_size, &page2) ||
|
||
|
|
get_vm_area((unsigned long)map + page_size * 2, &page3)) {
|
||
|
|
printf("couldn't find mapping in /proc/self/maps\n");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Before we unlock a portion, we need to that all three pages are in
|
||
|
|
* the same VMA. If they are not we abort this test (Note that this is
|
||
|
|
* not a failure)
|
||
|
|
*/
|
||
|
|
if (page1.start != page2.start || page2.start != page3.start) {
|
||
|
|
printf("VMAs are not merged to start, aborting test\n");
|
||
|
|
ret = 0;
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (munlock(map + page_size, page_size)) {
|
||
|
|
perror("munlock()");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (get_vm_area((unsigned long)map, &page1) ||
|
||
|
|
get_vm_area((unsigned long)map + page_size, &page2) ||
|
||
|
|
get_vm_area((unsigned long)map + page_size * 2, &page3)) {
|
||
|
|
printf("couldn't find mapping in /proc/self/maps\n");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* All three VMAs should be different */
|
||
|
|
if (page1.start == page2.start || page2.start == page3.start) {
|
||
|
|
printf("failed to split VMA for munlock\n");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Now unlock the first and third page and check the VMAs again */
|
||
|
|
if (munlock(map, page_size * 3)) {
|
||
|
|
perror("munlock()");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (get_vm_area((unsigned long)map, &page1) ||
|
||
|
|
get_vm_area((unsigned long)map + page_size, &page2) ||
|
||
|
|
get_vm_area((unsigned long)map + page_size * 2, &page3)) {
|
||
|
|
printf("couldn't find mapping in /proc/self/maps\n");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Now all three VMAs should be the same */
|
||
|
|
if (page1.start != page2.start || page2.start != page3.start) {
|
||
|
|
printf("failed to merge VMAs after munlock\n");
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = 0;
|
||
|
|
out:
|
||
|
|
munmap(map, 3 * page_size);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int test_mlockall(int (test_function)(bool call_mlock))
|
||
|
|
{
|
||
|
|
int ret = 1;
|
||
|
|
|
||
|
|
if (mlockall(MCL_CURRENT | MCL_ONFAULT | MCL_FUTURE)) {
|
||
|
|
perror("mlockall");
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = test_function(false);
|
||
|
|
munlockall();
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
int main(int argc, char **argv)
|
||
|
|
{
|
||
|
|
int ret = 0;
|
||
|
|
ret += test_mlock_lock();
|
||
|
|
ret += test_mlock_onfault();
|
||
|
|
ret += test_munlockall();
|
||
|
|
ret += test_lock_onfault_of_present();
|
||
|
|
ret += test_vma_management(true);
|
||
|
|
ret += test_mlockall(test_vma_management);
|
||
|
|
return ret;
|
||
|
|
}
|