Release 4.18 tools/testing/selftests/memfd/memfd_test.c
// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#define __EXPORTED_HEADERS__
#include <errno.h>
#include <inttypes.h>
#include <limits.h>
#include <linux/falloc.h>
#include <linux/fcntl.h>
#include <linux/memfd.h>
#include <sched.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/wait.h>
#include <unistd.h>
#include "common.h"
#define MEMFD_STR "memfd:"
#define MEMFD_HUGE_STR "memfd-hugetlb:"
#define SHARED_FT_STR "(shared file-table)"
#define MFD_DEF_SIZE 8192
#define STACK_SIZE 65536
/*
* Default is not to test hugetlbfs
*/
static size_t mfd_def_size = MFD_DEF_SIZE;
static const char *memfd_str = MEMFD_STR;
static int mfd_assert_new(const char *name, loff_t sz, unsigned int flags)
{
int r, fd;
fd = sys_memfd_create(name, flags);
if (fd < 0) {
printf("memfd_create(\"%s\", %u) failed: %m\n",
name, flags);
abort();
}
r = ftruncate(fd, sz);
if (r < 0) {
printf("ftruncate(%llu) failed: %m\n", (unsigned long long)sz);
abort();
}
return fd;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 87 | 100.00% | 1 | 100.00% |
| Total | 87 | 100.00% | 1 | 100.00% |
static void mfd_fail_new(const char *name, unsigned int flags)
{
int r;
r = sys_memfd_create(name, flags);
if (r >= 0) {
printf("memfd_create(\"%s\", %u) succeeded, but failure expected\n",
name, flags);
close(r);
abort();
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 52 | 100.00% | 1 | 100.00% |
| Total | 52 | 100.00% | 1 | 100.00% |
static unsigned int mfd_assert_get_seals(int fd)
{
int r;
r = fcntl(fd, F_GET_SEALS);
if (r < 0) {
printf("GET_SEALS(%d) failed: %m\n", fd);
abort();
}
return (unsigned int)r;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 40 | 85.11% | 1 | 50.00% |
| Pranith Kumar | 7 | 14.89% | 1 | 50.00% |
| Total | 47 | 100.00% | 2 | 100.00% |
static void mfd_assert_has_seals(int fd, unsigned int seals)
{
unsigned int s;
s = mfd_assert_get_seals(fd);
if (s != seals) {
printf("%u != %u = GET_SEALS(%d)\n", seals, s, fd);
abort();
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 41 | 89.13% | 1 | 50.00% |
| Pranith Kumar | 5 | 10.87% | 1 | 50.00% |
| Total | 46 | 100.00% | 2 | 100.00% |
static void mfd_assert_add_seals(int fd, unsigned int seals)
{
int r;
unsigned int s;
s = mfd_assert_get_seals(fd);
r = fcntl(fd, F_ADD_SEALS, seals);
if (r < 0) {
printf("ADD_SEALS(%d, %u -> %u) failed: %m\n", fd, s, seals);
abort();
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 54 | 90.00% | 1 | 50.00% |
| Pranith Kumar | 6 | 10.00% | 1 | 50.00% |
| Total | 60 | 100.00% | 2 | 100.00% |
static void mfd_fail_add_seals(int fd, unsigned int seals)
{
int r;
unsigned int s;
r = fcntl(fd, F_GET_SEALS);
if (r < 0)
s = 0;
else
s = (unsigned int)r;
r = fcntl(fd, F_ADD_SEALS, seals);
if (r >= 0) {
printf("ADD_SEALS(%d, %u -> %u) didn't fail as expected\n",
fd, s, seals);
abort();
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 71 | 87.65% | 1 | 50.00% |
| Pranith Kumar | 10 | 12.35% | 1 | 50.00% |
| Total | 81 | 100.00% | 2 | 100.00% |
static void mfd_assert_size(int fd, size_t size)
{
struct stat st;
int r;
r = fstat(fd, &st);
if (r < 0) {
printf("fstat(%d) failed: %m\n", fd);
abort();
} else if (st.st_size != size) {
printf("wrong file size %lld, but expected %lld\n",
(long long)st.st_size, (long long)size);
abort();
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 80 | 100.00% | 1 | 100.00% |
| Total | 80 | 100.00% | 1 | 100.00% |
static int mfd_assert_dup(int fd)
{
int r;
r = dup(fd);
if (r < 0) {
printf("dup(%d) failed: %m\n", fd);
abort();
}
return r;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 40 | 100.00% | 1 | 100.00% |
| Total | 40 | 100.00% | 1 | 100.00% |
static void *mfd_assert_mmap_shared(int fd)
{
void *p;
p = mmap(NULL,
mfd_def_size,
PROT_READ | PROT_WRITE,
MAP_SHARED,
fd,
0);
if (p == MAP_FAILED) {
printf("mmap() failed: %m\n");
abort();
}
return p;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 51 | 98.08% | 1 | 50.00% |
| Mike Kravetz | 1 | 1.92% | 1 | 50.00% |
| Total | 52 | 100.00% | 2 | 100.00% |
static void *mfd_assert_mmap_private(int fd)
{
void *p;
p = mmap(NULL,
mfd_def_size,
PROT_READ,
MAP_PRIVATE,
fd,
0);
if (p == MAP_FAILED) {
printf("mmap() failed: %m\n");
abort();
}
return p;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 49 | 98.00% | 1 | 50.00% |
| Mike Kravetz | 1 | 2.00% | 1 | 50.00% |
| Total | 50 | 100.00% | 2 | 100.00% |
static int mfd_assert_open(int fd, int flags, mode_t mode)
{
char buf[512];
int r;
sprintf(buf, "/proc/self/fd/%d", fd);
r = open(buf, flags, mode);
if (r < 0) {
printf("open(%s) failed: %m\n", buf);
abort();
}
return r;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 65 | 100.00% | 1 | 100.00% |
| Total | 65 | 100.00% | 1 | 100.00% |
static void mfd_fail_open(int fd, int flags, mode_t mode)
{
char buf[512];
int r;
sprintf(buf, "/proc/self/fd/%d", fd);
r = open(buf, flags, mode);
if (r >= 0) {
printf("open(%s) didn't fail as expected\n", buf);
abort();
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 60 | 96.77% | 1 | 50.00% |
| Pranith Kumar | 2 | 3.23% | 1 | 50.00% |
| Total | 62 | 100.00% | 2 | 100.00% |
static void mfd_assert_read(int fd)
{
char buf[16];
void *p;
ssize_t l;
l = read(fd, buf, sizeof(buf));
if (l != sizeof(buf)) {
printf("read() failed: %m\n");
abort();
}
/* verify PROT_READ *is* allowed */
p = mmap(NULL,
mfd_def_size,
PROT_READ,
MAP_PRIVATE,
fd,
0);
if (p == MAP_FAILED) {
printf("mmap() failed: %m\n");
abort();
}
munmap(p, mfd_def_size);
/* verify MAP_PRIVATE is *always* allowed (even writable) */
p = mmap(NULL,
mfd_def_size,
PROT_READ | PROT_WRITE,
MAP_PRIVATE,
fd,
0);
if (p == MAP_FAILED) {
printf("mmap() failed: %m\n");
abort();
}
munmap(p, mfd_def_size);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 135 | 97.12% | 1 | 50.00% |
| Mike Kravetz | 4 | 2.88% | 1 | 50.00% |
| Total | 139 | 100.00% | 2 | 100.00% |
static void mfd_assert_write(int fd)
{
ssize_t l;
void *p;
int r;
/*
* huegtlbfs does not support write, but we want to
* verify everything else here.
*/
if (!hugetlbfs_test) {
/* verify write() succeeds */
l = write(fd, "\0\0\0\0", 4);
if (l != 4) {
printf("write() failed: %m\n");
abort();
}
}
/* verify PROT_READ | PROT_WRITE is allowed */
p = mmap(NULL,
mfd_def_size,
PROT_READ | PROT_WRITE,
MAP_SHARED,
fd,
0);
if (p == MAP_FAILED) {
printf("mmap() failed: %m\n");
abort();
}
*(char *)p = 0;
munmap(p, mfd_def_size);
/* verify PROT_WRITE is allowed */
p = mmap(NULL,
mfd_def_size,
PROT_WRITE,
MAP_SHARED,
fd,
0);
if (p == MAP_FAILED) {
printf("mmap() failed: %m\n");
abort();
}
*(char *)p = 0;
munmap(p, mfd_def_size);
/* verify PROT_READ with MAP_SHARED is allowed and a following
* mprotect(PROT_WRITE) allows writing */
p = mmap(NULL,
mfd_def_size,
PROT_READ,
MAP_SHARED,
fd,
0);
if (p == MAP_FAILED) {
printf("mmap() failed: %m\n");
abort();
}
r = mprotect(p, mfd_def_size, PROT_READ | PROT_WRITE);
if (r < 0) {
printf("mprotect() failed: %m\n");
abort();
}
*(char *)p = 0;
munmap(p, mfd_def_size);
/* verify PUNCH_HOLE works */
r = fallocate(fd,
FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
0,
mfd_def_size);
if (r < 0) {
printf("fallocate(PUNCH_HOLE) failed: %m\n");
abort();
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 252 | 94.03% | 1 | 50.00% |
| Mike Kravetz | 16 | 5.97% | 1 | 50.00% |
| Total | 268 | 100.00% | 2 | 100.00% |
static void mfd_fail_write(int fd)
{
ssize_t l;
void *p;
int r;
/* verify write() fails */
l = write(fd, "data", 4);
if (l != -EPERM) {
printf("expected EPERM on write(), but got %d: %m\n", (int)l);
abort();
}
/* verify PROT_READ | PROT_WRITE is not allowed */
p = mmap(NULL,
mfd_def_size,
PROT_READ | PROT_WRITE,
MAP_SHARED,
fd,
0);
if (p != MAP_FAILED) {
printf("mmap() didn't fail as expected\n");
abort();
}
/* verify PROT_WRITE is not allowed */
p = mmap(NULL,
mfd_def_size,
PROT_WRITE,
MAP_SHARED,
fd,
0);
if (p != MAP_FAILED) {
printf("mmap() didn't fail as expected\n");
abort();
}
/* Verify PROT_READ with MAP_SHARED with a following mprotect is not
* allowed. Note that for r/w the kernel already prevents the mmap. */
p = mmap(NULL,
mfd_def_size,
PROT_READ,
MAP_SHARED,
fd,
0);
if (p != MAP_FAILED) {
r = mprotect(p, mfd_def_size, PROT_READ | PROT_WRITE);
if (r >= 0) {
printf("mmap()+mprotect() didn't fail as expected\n");
abort();
}
}
/* verify PUNCH_HOLE fails */
r = fallocate(fd,
FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
0,
mfd_def_size);
if (r >= 0) {
printf("fallocate(PUNCH_HOLE) didn't fail as expected\n");
abort();
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 205 | 97.62% | 1 | 50.00% |
| Mike Kravetz | 5 | 2.38% | 1 | 50.00% |
| Total | 210 | 100.00% | 2 | 100.00% |
static void mfd_assert_shrink(int fd)
{
int r, fd2;
r = ftruncate(fd, mfd_def_size / 2);
if (r < 0) {
printf("ftruncate(SHRINK) failed: %m\n");
abort();
}
mfd_assert_size(fd, mfd_def_size / 2);
fd2 = mfd_assert_open(fd,
O_RDWR | O_CREAT | O_TRUNC,
S_IRUSR | S_IWUSR);
close(fd2);
mfd_assert_size(fd, 0);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 77 | 97.47% | 1 | 50.00% |
| Mike Kravetz | 2 | 2.53% | 1 | 50.00% |
| Total | 79 | 100.00% | 2 | 100.00% |
static void mfd_fail_shrink(int fd)
{
int r;
r = ftruncate(fd, mfd_def_size / 2);
if (r >= 0) {
printf("ftruncate(SHRINK) didn't fail as expected\n");
abort();
}
mfd_fail_open(fd,
O_RDWR | O_CREAT | O_TRUNC,
S_IRUSR | S_IWUSR);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 53 | 98.15% | 1 | 50.00% |
| Mike Kravetz | 1 | 1.85% | 1 | 50.00% |
| Total | 54 | 100.00% | 2 | 100.00% |
static void mfd_assert_grow(int fd)
{
int r;
r = ftruncate(fd, mfd_def_size * 2);
if (r < 0) {
printf("ftruncate(GROW) failed: %m\n");
abort();
}
mfd_assert_size(fd, mfd_def_size * 2);
r = fallocate(fd,
0,
0,
mfd_def_size * 4);
if (r < 0) {
printf("fallocate(ALLOC) failed: %m\n");
abort();
}
mfd_assert_size(fd, mfd_def_size * 4);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 84 | 95.45% | 1 | 50.00% |
| Mike Kravetz | 4 | 4.55% | 1 | 50.00% |
| Total | 88 | 100.00% | 2 | 100.00% |
static void mfd_fail_grow(int fd)
{
int r;
r = ftruncate(fd, mfd_def_size * 2);
if (r >= 0) {
printf("ftruncate(GROW) didn't fail as expected\n");
abort();
}
r = fallocate(fd,
0,
0,
mfd_def_size * 4);
if (r >= 0) {
printf("fallocate(ALLOC) didn't fail as expected\n");
abort();
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 68 | 97.14% | 1 | 50.00% |
| Mike Kravetz | 2 | 2.86% | 1 | 50.00% |
| Total | 70 | 100.00% | 2 | 100.00% |
static void mfd_assert_grow_write(int fd)
{
static char *buf;
ssize_t l;
/* hugetlbfs does not support write */
if (hugetlbfs_test)
return;
buf = malloc(mfd_def_size * 8);
if (!buf) {
printf("malloc(%zu) failed: %m\n", mfd_def_size * 8);
abort();
}
l = pwrite(fd, buf, mfd_def_size * 8, 0);
if (l != (mfd_def_size * 8)) {
printf("pwrite() failed: %m\n");
abort();
}
mfd_assert_size(fd, mfd_def_size * 8);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 51 | 53.68% | 1 | 25.00% |
| Mike Kravetz | 37 | 38.95% | 1 | 25.00% |
| Marc-André Lureau | 6 | 6.32% | 1 | 25.00% |
| Lei Yang | 1 | 1.05% | 1 | 25.00% |
| Total | 95 | 100.00% | 4 | 100.00% |
static void mfd_fail_grow_write(int fd)
{
static char *buf;
ssize_t l;
/* hugetlbfs does not support write */
if (hugetlbfs_test)
return;
buf = malloc(mfd_def_size * 8);
if (!buf) {
printf("malloc(%zu) failed: %m\n", mfd_def_size * 8);
abort();
}
l = pwrite(fd, buf, mfd_def_size * 8, 0);
if (l == (mfd_def_size * 8)) {
printf("pwrite() didn't fail as expected\n");
abort();
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 43 | 50.00% | 1 | 25.00% |
| Mike Kravetz | 36 | 41.86% | 1 | 25.00% |
| Marc-André Lureau | 6 | 6.98% | 1 | 25.00% |
| Lei Yang | 1 | 1.16% | 1 | 25.00% |
| Total | 86 | 100.00% | 4 | 100.00% |
static int idle_thread_fn(void *arg)
{
sigset_t set;
int sig;
/* dummy waiter; SIGTERM terminates us anyway */
sigemptyset(&set);
sigaddset(&set, SIGTERM);
sigwait(&set, &sig);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 43 | 100.00% | 1 | 100.00% |
| Total | 43 | 100.00% | 1 | 100.00% |
static pid_t spawn_idle_thread(unsigned int flags)
{
uint8_t *stack;
pid_t pid;
stack = malloc(STACK_SIZE);
if (!stack) {
printf("malloc(STACK_SIZE) failed: %m\n");
abort();
}
pid = clone(idle_thread_fn,
stack + STACK_SIZE,
SIGCHLD | flags,
NULL);
if (pid < 0) {
printf("clone() failed: %m\n");
abort();
}
return pid;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 75 | 100.00% | 1 | 100.00% |
| Total | 75 | 100.00% | 1 | 100.00% |
static void join_idle_thread(pid_t pid)
{
kill(pid, SIGTERM);
waitpid(pid, NULL, 0);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 25 | 100.00% | 1 | 100.00% |
| Total | 25 | 100.00% | 1 | 100.00% |
/*
* Test memfd_create() syscall
* Verify syscall-argument validation, including name checks, flag validation
* and more.
*/
static void test_create(void)
{
char buf[2048];
int fd;
printf("%s CREATE\n", memfd_str);
/* test NULL name */
mfd_fail_new(NULL, 0);
/* test over-long name (not zero-terminated) */
memset(buf, 0xff, sizeof(buf));
mfd_fail_new(buf, 0);
/* test over-long zero-terminated name */
memset(buf, 0xff, sizeof(buf));
buf[sizeof(buf) - 1] = 0;
mfd_fail_new(buf, 0);
/* verify "" is a valid name */
fd = mfd_assert_new("", 0, 0);
close(fd);
/* verify invalid O_* open flags */
mfd_fail_new("", 0x0100);
mfd_fail_new("", ~MFD_CLOEXEC);
mfd_fail_new("", ~MFD_ALLOW_SEALING);
mfd_fail_new("", ~0);
mfd_fail_new("", 0x80000000U);
/* verify MFD_CLOEXEC is allowed */
fd = mfd_assert_new("", 0, MFD_CLOEXEC);
close(fd);
/* verify MFD_ALLOW_SEALING is allowed */
fd = mfd_assert_new("", 0, MFD_ALLOW_SEALING);
close(fd);
/* verify MFD_ALLOW_SEALING | MFD_CLOEXEC is allowed */
fd = mfd_assert_new("", 0, MFD_ALLOW_SEALING | MFD_CLOEXEC);
close(fd);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 186 | 96.37% | 1 | 33.33% |
| Mike Kravetz | 6 | 3.11% | 1 | 33.33% |
| Marc-André Lureau | 1 | 0.52% | 1 | 33.33% |
| Total | 193 | 100.00% | 3 | 100.00% |
/*
* Test basic sealing
* A very basic sealing test to see whether setting/retrieving seals works.
*/
static void test_basic(void)
{
int fd;
printf("%s BASIC\n", memfd_str);
fd = mfd_assert_new("kern_memfd_basic",
mfd_def_size,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
/* add basic seals */
mfd_assert_has_seals(fd, 0);
mfd_assert_add_seals(fd, F_SEAL_SHRINK |
F_SEAL_WRITE);
mfd_assert_has_seals(fd, F_SEAL_SHRINK |
F_SEAL_WRITE);
/* add them again */
mfd_assert_add_seals(fd, F_SEAL_SHRINK |
F_SEAL_WRITE);
mfd_assert_has_seals(fd, F_SEAL_SHRINK |
F_SEAL_WRITE);
/* add more seals and seal against sealing */
mfd_assert_add_seals(fd, F_SEAL_GROW | F_SEAL_SEAL);
mfd_assert_has_seals(fd, F_SEAL_SHRINK |
F_SEAL_GROW |
F_SEAL_WRITE |
F_SEAL_SEAL);
/* verify that sealing no longer works */
mfd_fail_add_seals(fd, F_SEAL_GROW);
mfd_fail_add_seals(fd, 0);
close(fd);
/* verify sealing does not work without MFD_ALLOW_SEALING */
fd = mfd_assert_new("kern_memfd_basic",
mfd_def_size,
MFD_CLOEXEC);
mfd_assert_has_seals(fd, F_SEAL_SEAL);
mfd_fail_add_seals(fd, F_SEAL_SHRINK |
F_SEAL_GROW |
F_SEAL_WRITE);
mfd_assert_has_seals(fd, F_SEAL_SEAL);
close(fd);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 152 | 94.41% | 1 | 33.33% |
| Mike Kravetz | 8 | 4.97% | 1 | 33.33% |
| Marc-André Lureau | 1 | 0.62% | 1 | 33.33% |
| Total | 161 | 100.00% | 3 | 100.00% |
/*
* Test SEAL_WRITE
* Test whether SEAL_WRITE actually prevents modifications.
*/
static void test_seal_write(void)
{
int fd;
printf("%s SEAL-WRITE\n", memfd_str);
fd = mfd_assert_new("kern_memfd_seal_write",
mfd_def_size,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
mfd_assert_has_seals(fd, 0);
mfd_assert_add_seals(fd, F_SEAL_WRITE);
mfd_assert_has_seals(fd, F_SEAL_WRITE);
mfd_assert_read(fd);
mfd_fail_write(fd);
mfd_assert_shrink(fd);
mfd_assert_grow(fd);
mfd_fail_grow_write(fd);
close(fd);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 58 | 70.73% | 1 | 33.33% |
| Mike Kravetz | 23 | 28.05% | 1 | 33.33% |
| Marc-André Lureau | 1 | 1.22% | 1 | 33.33% |
| Total | 82 | 100.00% | 3 | 100.00% |
/*
* Test SEAL_SHRINK
* Test whether SEAL_SHRINK actually prevents shrinking
*/
static void test_seal_shrink(void)
{
int fd;
printf("%s SEAL-SHRINK\n", memfd_str);
fd = mfd_assert_new("kern_memfd_seal_shrink",
mfd_def_size,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
mfd_assert_has_seals(fd, 0);
mfd_assert_add_seals(fd, F_SEAL_SHRINK);
mfd_assert_has_seals(fd, F_SEAL_SHRINK);
mfd_assert_read(fd);
mfd_assert_write(fd);
mfd_fail_shrink(fd);
mfd_assert_grow(fd);
mfd_assert_grow_write(fd);
close(fd);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 74 | 90.24% | 1 | 33.33% |
| Mike Kravetz | 7 | 8.54% | 1 | 33.33% |
| Marc-André Lureau | 1 | 1.22% | 1 | 33.33% |
| Total | 82 | 100.00% | 3 | 100.00% |
/*
* Test SEAL_GROW
* Test whether SEAL_GROW actually prevents growing
*/
static void test_seal_grow(void)
{
int fd;
printf("%s SEAL-GROW\n", memfd_str);
fd = mfd_assert_new("kern_memfd_seal_grow",
mfd_def_size,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
mfd_assert_has_seals(fd, 0);
mfd_assert_add_seals(fd, F_SEAL_GROW);
mfd_assert_has_seals(fd, F_SEAL_GROW);
mfd_assert_read(fd);
mfd_assert_write(fd);
mfd_assert_shrink(fd);
mfd_fail_grow(fd);
mfd_fail_grow_write(fd);
close(fd);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 74 | 90.24% | 1 | 33.33% |
| Mike Kravetz | 7 | 8.54% | 1 | 33.33% |
| Marc-André Lureau | 1 | 1.22% | 1 | 33.33% |
| Total | 82 | 100.00% | 3 | 100.00% |
/*
* Test SEAL_SHRINK | SEAL_GROW
* Test whether SEAL_SHRINK | SEAL_GROW actually prevents resizing
*/
static void test_seal_resize(void)
{
int fd;
printf("%s SEAL-RESIZE\n", memfd_str);
fd = mfd_assert_new("kern_memfd_seal_resize",
mfd_def_size,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
mfd_assert_has_seals(fd, 0);
mfd_assert_add_seals(fd, F_SEAL_SHRINK | F_SEAL_GROW);
mfd_assert_has_seals(fd, F_SEAL_SHRINK | F_SEAL_GROW);
mfd_assert_read(fd);
mfd_assert_write(fd);
mfd_fail_shrink(fd);
mfd_fail_grow(fd);
mfd_fail_grow_write(fd);
close(fd);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 78 | 90.70% | 1 | 33.33% |
| Mike Kravetz | 7 | 8.14% | 1 | 33.33% |
| Marc-André Lureau | 1 | 1.16% | 1 | 33.33% |
| Total | 86 | 100.00% | 3 | 100.00% |
/*
* Test sharing via dup()
* Test that seals are shared between dupped FDs and they're all equal.
*/
static void test_share_dup(char *banner, char *b_suffix)
{
int fd, fd2;
printf("%s %s %s\n", memfd_str, banner, b_suffix);
fd = mfd_assert_new("kern_memfd_share_dup",
mfd_def_size,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
mfd_assert_has_seals(fd, 0);
fd2 = mfd_assert_dup(fd);
mfd_assert_has_seals(fd2, 0);
mfd_assert_add_seals(fd, F_SEAL_WRITE);
mfd_assert_has_seals(fd, F_SEAL_WRITE);
mfd_assert_has_seals(fd2, F_SEAL_WRITE);
mfd_assert_add_seals(fd2, F_SEAL_SHRINK);
mfd_assert_has_seals(fd, F_SEAL_WRITE | F_SEAL_SHRINK);
mfd_assert_has_seals(fd2, F_SEAL_WRITE | F_SEAL_SHRINK);
mfd_assert_add_seals(fd, F_SEAL_SEAL);
mfd_assert_has_seals(fd, F_SEAL_WRITE | F_SEAL_SHRINK | F_SEAL_SEAL);
mfd_assert_has_seals(fd2, F_SEAL_WRITE | F_SEAL_SHRINK | F_SEAL_SEAL);
mfd_fail_add_seals(fd, F_SEAL_GROW);
mfd_fail_add_seals(fd2, F_SEAL_GROW);
mfd_fail_add_seals(fd, F_SEAL_SEAL);
mfd_fail_add_seals(fd2, F_SEAL_SEAL);
close(fd2);
mfd_fail_add_seals(fd, F_SEAL_GROW);
close(fd);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 165 | 89.67% | 1 | 33.33% |
| Mike Kravetz | 18 | 9.78% | 1 | 33.33% |
| Marc-André Lureau | 1 | 0.54% | 1 | 33.33% |
| Total | 184 | 100.00% | 3 | 100.00% |
/*
* Test sealing with active mmap()s
* Modifying seals is only allowed if no other mmap() refs exist.
*/
static void test_share_mmap(char *banner, char *b_suffix)
{
int fd;
void *p;
printf("%s %s %s\n", memfd_str, banner, b_suffix);
fd = mfd_assert_new("kern_memfd_share_mmap",
mfd_def_size,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
mfd_assert_has_seals(fd, 0);
/* shared/writable ref prevents sealing WRITE, but allows others */
p = mfd_assert_mmap_shared(fd);
mfd_fail_add_seals(fd, F_SEAL_WRITE);
mfd_assert_has_seals(fd, 0);
mfd_assert_add_seals(fd, F_SEAL_SHRINK);
mfd_assert_has_seals(fd, F_SEAL_SHRINK);
munmap(p, mfd_def_size);
/* readable ref allows sealing */
p = mfd_assert_mmap_private(fd);
mfd_assert_add_seals(fd, F_SEAL_WRITE);
mfd_assert_has_seals(fd, F_SEAL_WRITE | F_SEAL_SHRINK);
munmap(p, mfd_def_size);
close(fd);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 102 | 77.86% | 1 | 33.33% |
| Mike Kravetz | 28 | 21.37% | 1 | 33.33% |
| Marc-André Lureau | 1 | 0.76% | 1 | 33.33% |
| Total | 131 | 100.00% | 3 | 100.00% |
/*
* Test sealing with open(/proc/self/fd/%d)
* Via /proc we can get access to a separate file-context for the same memfd.
* This is *not* like dup(), but like a real separate open(). Make sure the
* semantics are as expected and we correctly check for RDONLY / WRONLY / RDWR.
*/
static void test_share_open(char *banner, char *b_suffix)
{
int fd, fd2;
printf("%s %s %s\n", memfd_str, banner, b_suffix);
fd = mfd_assert_new("kern_memfd_share_open",
mfd_def_size,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
mfd_assert_has_seals(fd, 0);
fd2 = mfd_assert_open(fd, O_RDWR, 0);
mfd_assert_add_seals(fd, F_SEAL_WRITE);
mfd_assert_has_seals(fd, F_SEAL_WRITE);
mfd_assert_has_seals(fd2, F_SEAL_WRITE);
mfd_assert_add_seals(fd2, F_SEAL_SHRINK);
mfd_assert_has_seals(fd, F_SEAL_WRITE | F_SEAL_SHRINK);
mfd_assert_has_seals(fd2, F_SEAL_WRITE | F_SEAL_SHRINK);
close(fd);
fd = mfd_assert_open(fd2, O_RDONLY, 0);
mfd_fail_add_seals(fd, F_SEAL_SEAL);
mfd_assert_has_seals(fd, F_SEAL_WRITE | F_SEAL_SHRINK);
mfd_assert_has_seals(fd2, F_SEAL_WRITE | F_SEAL_SHRINK);
close(fd2);
fd2 = mfd_assert_open(fd, O_RDWR, 0);
mfd_assert_add_seals(fd2, F_SEAL_SEAL);
mfd_assert_has_seals(fd, F_SEAL_WRITE | F_SEAL_SHRINK | F_SEAL_SEAL);
mfd_assert_has_seals(fd2, F_SEAL_WRITE | F_SEAL_SHRINK | F_SEAL_SEAL);
close(fd2);
close(fd);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 184 | 90.64% | 1 | 33.33% |
| Mike Kravetz | 18 | 8.87% | 1 | 33.33% |
| Marc-André Lureau | 1 | 0.49% | 1 | 33.33% |
| Total | 203 | 100.00% | 3 | 100.00% |
/*
* Test sharing via fork()
* Test whether seal-modifications work as expected with forked childs.
*/
static void test_share_fork(char *banner, char *b_suffix)
{
int fd;
pid_t pid;
printf("%s %s %s\n", memfd_str, banner, b_suffix);
fd = mfd_assert_new("kern_memfd_share_fork",
mfd_def_size,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
mfd_assert_has_seals(fd, 0);
pid = spawn_idle_thread(0);
mfd_assert_add_seals(fd, F_SEAL_SEAL);
mfd_assert_has_seals(fd, F_SEAL_SEAL);
mfd_fail_add_seals(fd, F_SEAL_WRITE);
mfd_assert_has_seals(fd, F_SEAL_SEAL);
join_idle_thread(pid);
mfd_fail_add_seals(fd, F_SEAL_WRITE);
mfd_assert_has_seals(fd, F_SEAL_SEAL);
close(fd);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 91 | 82.73% | 1 | 33.33% |
| Mike Kravetz | 18 | 16.36% | 1 | 33.33% |
| Marc-André Lureau | 1 | 0.91% | 1 | 33.33% |
| Total | 110 | 100.00% | 3 | 100.00% |
int main(int argc, char **argv)
{
pid_t pid;
if (argc == 2) {
if (!strcmp(argv[1], "hugetlbfs")) {
unsigned long hpage_size = default_huge_page_size();
if (!hpage_size) {
printf("Unable to determine huge page size\n");
abort();
}
hugetlbfs_test = 1;
memfd_str = MEMFD_HUGE_STR;
mfd_def_size = hpage_size * 2;
} else {
printf("Unknown option: %s\n", argv[1]);
abort();
}
}
test_create();
test_basic();
test_seal_write();
test_seal_shrink();
test_seal_grow();
test_seal_resize();
test_share_dup("SHARE-DUP", "");
test_share_mmap("SHARE-MMAP", "");
test_share_open("SHARE-OPEN", "");
test_share_fork("SHARE-FORK", "");
/* Run test-suite in a multi-threaded environment with a shared
* file-table. */
pid = spawn_idle_thread(CLONE_FILES | CLONE_FS | CLONE_VM);
test_share_dup("SHARE-DUP", SHARED_FT_STR);
test_share_mmap("SHARE-MMAP", SHARED_FT_STR);
test_share_open("SHARE-OPEN", SHARED_FT_STR);
test_share_fork("SHARE-FORK", SHARED_FT_STR);
join_idle_thread(pid);
printf("memfd: DONE\n");
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 91 | 47.89% | 1 | 33.33% |
| Mike Kravetz | 79 | 41.58% | 1 | 33.33% |
| Marc-André Lureau | 20 | 10.53% | 1 | 33.33% |
| Total | 190 | 100.00% | 3 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Herrmann | 3123 | 87.70% | 1 | 9.09% |
| Mike Kravetz | 344 | 9.66% | 1 | 9.09% |
| Marc-André Lureau | 57 | 1.60% | 3 | 27.27% |
| Pranith Kumar | 30 | 0.84% | 2 | 18.18% |
| Ben Hutchings | 3 | 0.08% | 1 | 9.09% |
| Lei Yang | 2 | 0.06% | 1 | 9.09% |
| Greg Kroah-Hartman | 1 | 0.03% | 1 | 9.09% |
| Chunyan Zhang | 1 | 0.03% | 1 | 9.09% |
| Total | 3561 | 100.00% | 11 | 100.00% |
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