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Diffstat (limited to 'tools/testing/selftests/memfd/memfd_test.c')
-rw-r--r--tools/testing/selftests/memfd/memfd_test.c372
1 files changed, 287 insertions, 85 deletions
diff --git a/tools/testing/selftests/memfd/memfd_test.c b/tools/testing/selftests/memfd/memfd_test.c
index 26546892cd54..f94c6d1fb46f 100644
--- a/tools/testing/selftests/memfd/memfd_test.c
+++ b/tools/testing/selftests/memfd/memfd_test.c
@@ -18,12 +18,48 @@
#include <sys/wait.h>
#include <unistd.h>
+#define MEMFD_STR "memfd:"
+#define SHARED_FT_STR "(shared file-table)"
+
#define MFD_DEF_SIZE 8192
#define STACK_SIZE 65536
+/*
+ * Default is not to test hugetlbfs
+ */
+static int hugetlbfs_test;
+static size_t mfd_def_size = MFD_DEF_SIZE;
+
+/*
+ * Copied from mlock2-tests.c
+ */
+static unsigned long default_huge_page_size(void)
+{
+ unsigned long hps = 0;
+ char *line = NULL;
+ size_t linelen = 0;
+ FILE *f = fopen("/proc/meminfo", "r");
+
+ if (!f)
+ return 0;
+ while (getline(&line, &linelen, f) > 0) {
+ if (sscanf(line, "Hugepagesize: %lu kB", &hps) == 1) {
+ hps <<= 10;
+ break;
+ }
+ }
+
+ free(line);
+ fclose(f);
+ return hps;
+}
+
static int sys_memfd_create(const char *name,
unsigned int flags)
{
+ if (hugetlbfs_test)
+ flags |= MFD_HUGETLB;
+
return syscall(__NR_memfd_create, name, flags);
}
@@ -150,7 +186,7 @@ static void *mfd_assert_mmap_shared(int fd)
void *p;
p = mmap(NULL,
- MFD_DEF_SIZE,
+ mfd_def_size,
PROT_READ | PROT_WRITE,
MAP_SHARED,
fd,
@@ -168,7 +204,7 @@ static void *mfd_assert_mmap_private(int fd)
void *p;
p = mmap(NULL,
- MFD_DEF_SIZE,
+ mfd_def_size,
PROT_READ,
MAP_PRIVATE,
fd,
@@ -223,7 +259,7 @@ static void mfd_assert_read(int fd)
/* verify PROT_READ *is* allowed */
p = mmap(NULL,
- MFD_DEF_SIZE,
+ mfd_def_size,
PROT_READ,
MAP_PRIVATE,
fd,
@@ -232,11 +268,11 @@ static void mfd_assert_read(int fd)
printf("mmap() failed: %m\n");
abort();
}
- munmap(p, MFD_DEF_SIZE);
+ munmap(p, mfd_def_size);
/* verify MAP_PRIVATE is *always* allowed (even writable) */
p = mmap(NULL,
- MFD_DEF_SIZE,
+ mfd_def_size,
PROT_READ | PROT_WRITE,
MAP_PRIVATE,
fd,
@@ -245,7 +281,7 @@ static void mfd_assert_read(int fd)
printf("mmap() failed: %m\n");
abort();
}
- munmap(p, MFD_DEF_SIZE);
+ munmap(p, mfd_def_size);
}
static void mfd_assert_write(int fd)
@@ -254,16 +290,22 @@ static void mfd_assert_write(int fd)
void *p;
int r;
- /* verify write() succeeds */
- l = write(fd, "\0\0\0\0", 4);
- if (l != 4) {
- printf("write() failed: %m\n");
- abort();
+ /*
+ * 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,
+ mfd_def_size,
PROT_READ | PROT_WRITE,
MAP_SHARED,
fd,
@@ -273,11 +315,11 @@ static void mfd_assert_write(int fd)
abort();
}
*(char *)p = 0;
- munmap(p, MFD_DEF_SIZE);
+ munmap(p, mfd_def_size);
/* verify PROT_WRITE is allowed */
p = mmap(NULL,
- MFD_DEF_SIZE,
+ mfd_def_size,
PROT_WRITE,
MAP_SHARED,
fd,
@@ -287,12 +329,12 @@ static void mfd_assert_write(int fd)
abort();
}
*(char *)p = 0;
- munmap(p, MFD_DEF_SIZE);
+ 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,
+ mfd_def_size,
PROT_READ,
MAP_SHARED,
fd,
@@ -302,20 +344,20 @@ static void mfd_assert_write(int fd)
abort();
}
- r = mprotect(p, MFD_DEF_SIZE, PROT_READ | PROT_WRITE);
+ 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);
+ munmap(p, mfd_def_size);
/* verify PUNCH_HOLE works */
r = fallocate(fd,
FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
0,
- MFD_DEF_SIZE);
+ mfd_def_size);
if (r < 0) {
printf("fallocate(PUNCH_HOLE) failed: %m\n");
abort();
@@ -337,7 +379,7 @@ static void mfd_fail_write(int fd)
/* verify PROT_READ | PROT_WRITE is not allowed */
p = mmap(NULL,
- MFD_DEF_SIZE,
+ mfd_def_size,
PROT_READ | PROT_WRITE,
MAP_SHARED,
fd,
@@ -349,7 +391,7 @@ static void mfd_fail_write(int fd)
/* verify PROT_WRITE is not allowed */
p = mmap(NULL,
- MFD_DEF_SIZE,
+ mfd_def_size,
PROT_WRITE,
MAP_SHARED,
fd,
@@ -362,13 +404,13 @@ static void mfd_fail_write(int fd)
/* 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,
+ mfd_def_size,
PROT_READ,
MAP_SHARED,
fd,
0);
if (p != MAP_FAILED) {
- r = mprotect(p, MFD_DEF_SIZE, PROT_READ | PROT_WRITE);
+ r = mprotect(p, mfd_def_size, PROT_READ | PROT_WRITE);
if (r >= 0) {
printf("mmap()+mprotect() didn't fail as expected\n");
abort();
@@ -379,7 +421,7 @@ static void mfd_fail_write(int fd)
r = fallocate(fd,
FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
0,
- MFD_DEF_SIZE);
+ mfd_def_size);
if (r >= 0) {
printf("fallocate(PUNCH_HOLE) didn't fail as expected\n");
abort();
@@ -390,13 +432,13 @@ static void mfd_assert_shrink(int fd)
{
int r, fd2;
- r = ftruncate(fd, MFD_DEF_SIZE / 2);
+ 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);
+ mfd_assert_size(fd, mfd_def_size / 2);
fd2 = mfd_assert_open(fd,
O_RDWR | O_CREAT | O_TRUNC,
@@ -410,7 +452,7 @@ static void mfd_fail_shrink(int fd)
{
int r;
- r = ftruncate(fd, MFD_DEF_SIZE / 2);
+ r = ftruncate(fd, mfd_def_size / 2);
if (r >= 0) {
printf("ftruncate(SHRINK) didn't fail as expected\n");
abort();
@@ -425,31 +467,31 @@ static void mfd_assert_grow(int fd)
{
int r;
- r = ftruncate(fd, MFD_DEF_SIZE * 2);
+ 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);
+ mfd_assert_size(fd, mfd_def_size * 2);
r = fallocate(fd,
0,
0,
- MFD_DEF_SIZE * 4);
+ mfd_def_size * 4);
if (r < 0) {
printf("fallocate(ALLOC) failed: %m\n");
abort();
}
- mfd_assert_size(fd, MFD_DEF_SIZE * 4);
+ mfd_assert_size(fd, mfd_def_size * 4);
}
static void mfd_fail_grow(int fd)
{
int r;
- r = ftruncate(fd, MFD_DEF_SIZE * 2);
+ r = ftruncate(fd, mfd_def_size * 2);
if (r >= 0) {
printf("ftruncate(GROW) didn't fail as expected\n");
abort();
@@ -458,7 +500,7 @@ static void mfd_fail_grow(int fd)
r = fallocate(fd,
0,
0,
- MFD_DEF_SIZE * 4);
+ mfd_def_size * 4);
if (r >= 0) {
printf("fallocate(ALLOC) didn't fail as expected\n");
abort();
@@ -467,25 +509,37 @@ static void mfd_fail_grow(int fd)
static void mfd_assert_grow_write(int fd)
{
- static char buf[MFD_DEF_SIZE * 8];
+ static char *buf;
ssize_t l;
- l = pwrite(fd, buf, sizeof(buf), 0);
- if (l != sizeof(buf)) {
+ buf = malloc(mfd_def_size * 8);
+ if (!buf) {
+ printf("malloc(%d) 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);
+ mfd_assert_size(fd, mfd_def_size * 8);
}
static void mfd_fail_grow_write(int fd)
{
- static char buf[MFD_DEF_SIZE * 8];
+ static char *buf;
ssize_t l;
- l = pwrite(fd, buf, sizeof(buf), 0);
- if (l == sizeof(buf)) {
+ buf = malloc(mfd_def_size * 8);
+ if (!buf) {
+ printf("malloc(%d) 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();
}
@@ -543,6 +597,8 @@ static void test_create(void)
char buf[2048];
int fd;
+ printf("%s CREATE\n", MEMFD_STR);
+
/* test NULL name */
mfd_fail_new(NULL, 0);
@@ -570,13 +626,18 @@ static void test_create(void)
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);
+ if (!hugetlbfs_test) {
+ /* 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);
+ } else {
+ /* sealing is not supported on hugetlbfs */
+ mfd_fail_new("", MFD_ALLOW_SEALING);
+ }
}
/*
@@ -587,8 +648,14 @@ static void test_basic(void)
{
int fd;
+ /* hugetlbfs does not contain sealing support */
+ if (hugetlbfs_test)
+ return;
+
+ printf("%s BASIC\n", MEMFD_STR);
+
fd = mfd_assert_new("kern_memfd_basic",
- MFD_DEF_SIZE,
+ mfd_def_size,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
/* add basic seals */
@@ -619,7 +686,7 @@ static void test_basic(void)
/* verify sealing does not work without MFD_ALLOW_SEALING */
fd = mfd_assert_new("kern_memfd_basic",
- MFD_DEF_SIZE,
+ mfd_def_size,
MFD_CLOEXEC);
mfd_assert_has_seals(fd, F_SEAL_SEAL);
mfd_fail_add_seals(fd, F_SEAL_SHRINK |
@@ -630,6 +697,28 @@ static void test_basic(void)
}
/*
+ * hugetlbfs doesn't support seals or write, so just verify grow and shrink
+ * on a hugetlbfs file created via memfd_create.
+ */
+static void test_hugetlbfs_grow_shrink(void)
+{
+ int fd;
+
+ printf("%s HUGETLBFS-GROW-SHRINK\n", MEMFD_STR);
+
+ fd = mfd_assert_new("kern_memfd_seal_write",
+ mfd_def_size,
+ MFD_CLOEXEC);
+
+ mfd_assert_read(fd);
+ mfd_assert_write(fd);
+ mfd_assert_shrink(fd);
+ mfd_assert_grow(fd);
+
+ close(fd);
+}
+
+/*
* Test SEAL_WRITE
* Test whether SEAL_WRITE actually prevents modifications.
*/
@@ -637,8 +726,17 @@ static void test_seal_write(void)
{
int fd;
+ /*
+ * hugetlbfs does not contain sealing or write support. Just test
+ * basic grow and shrink via test_hugetlbfs_grow_shrink.
+ */
+ if (hugetlbfs_test)
+ return test_hugetlbfs_grow_shrink();
+
+ printf("%s SEAL-WRITE\n", MEMFD_STR);
+
fd = mfd_assert_new("kern_memfd_seal_write",
- MFD_DEF_SIZE,
+ mfd_def_size,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
mfd_assert_has_seals(fd, 0);
mfd_assert_add_seals(fd, F_SEAL_WRITE);
@@ -661,8 +759,14 @@ static void test_seal_shrink(void)
{
int fd;
+ /* hugetlbfs does not contain sealing support */
+ if (hugetlbfs_test)
+ return;
+
+ printf("%s SEAL-SHRINK\n", MEMFD_STR);
+
fd = mfd_assert_new("kern_memfd_seal_shrink",
- MFD_DEF_SIZE,
+ mfd_def_size,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
mfd_assert_has_seals(fd, 0);
mfd_assert_add_seals(fd, F_SEAL_SHRINK);
@@ -685,8 +789,14 @@ static void test_seal_grow(void)
{
int fd;
+ /* hugetlbfs does not contain sealing support */
+ if (hugetlbfs_test)
+ return;
+
+ printf("%s SEAL-GROW\n", MEMFD_STR);
+
fd = mfd_assert_new("kern_memfd_seal_grow",
- MFD_DEF_SIZE,
+ mfd_def_size,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
mfd_assert_has_seals(fd, 0);
mfd_assert_add_seals(fd, F_SEAL_GROW);
@@ -709,8 +819,14 @@ static void test_seal_resize(void)
{
int fd;
+ /* hugetlbfs does not contain sealing support */
+ if (hugetlbfs_test)
+ return;
+
+ printf("%s SEAL-RESIZE\n", MEMFD_STR);
+
fd = mfd_assert_new("kern_memfd_seal_resize",
- MFD_DEF_SIZE,
+ 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);
@@ -726,15 +842,52 @@ static void test_seal_resize(void)
}
/*
+ * hugetlbfs does not support seals. Basic test to dup the memfd created
+ * fd and perform some basic operations on it.
+ */
+static void hugetlbfs_dup(char *b_suffix)
+{
+ int fd, fd2;
+
+ printf("%s HUGETLBFS-DUP %s\n", MEMFD_STR, b_suffix);
+
+ fd = mfd_assert_new("kern_memfd_share_dup",
+ mfd_def_size,
+ MFD_CLOEXEC);
+
+ fd2 = mfd_assert_dup(fd);
+
+ mfd_assert_read(fd);
+ mfd_assert_write(fd);
+
+ mfd_assert_shrink(fd2);
+ mfd_assert_grow(fd2);
+
+ close(fd2);
+ close(fd);
+}
+
+/*
* Test sharing via dup()
* Test that seals are shared between dupped FDs and they're all equal.
*/
-static void test_share_dup(void)
+static void test_share_dup(char *banner, char *b_suffix)
{
int fd, fd2;
+ /*
+ * hugetlbfs does not contain sealing support. Perform some
+ * basic testing on dup'ed fd instead via hugetlbfs_dup.
+ */
+ if (hugetlbfs_test) {
+ hugetlbfs_dup(b_suffix);
+ return;
+ }
+
+ printf("%s %s %s\n", MEMFD_STR, banner, b_suffix);
+
fd = mfd_assert_new("kern_memfd_share_dup",
- MFD_DEF_SIZE,
+ mfd_def_size,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
mfd_assert_has_seals(fd, 0);
@@ -768,13 +921,19 @@ static void test_share_dup(void)
* Test sealing with active mmap()s
* Modifying seals is only allowed if no other mmap() refs exist.
*/
-static void test_share_mmap(void)
+static void test_share_mmap(char *banner, char *b_suffix)
{
int fd;
void *p;
+ /* hugetlbfs does not contain sealing support */
+ if (hugetlbfs_test)
+ return;
+
+ printf("%s %s %s\n", MEMFD_STR, banner, b_suffix);
+
fd = mfd_assert_new("kern_memfd_share_mmap",
- MFD_DEF_SIZE,
+ mfd_def_size,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
mfd_assert_has_seals(fd, 0);
@@ -784,14 +943,40 @@ static void test_share_mmap(void)
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);
+ 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);
+ munmap(p, mfd_def_size);
+
+ close(fd);
+}
+
+/*
+ * Basic test to make sure we can open the hugetlbfs fd via /proc and
+ * perform some simple operations on it.
+ */
+static void hugetlbfs_proc_open(char *b_suffix)
+{
+ int fd, fd2;
+
+ printf("%s HUGETLBFS-PROC-OPEN %s\n", MEMFD_STR, b_suffix);
+ fd = mfd_assert_new("kern_memfd_share_open",
+ mfd_def_size,
+ MFD_CLOEXEC);
+
+ fd2 = mfd_assert_open(fd, O_RDWR, 0);
+
+ mfd_assert_read(fd);
+ mfd_assert_write(fd);
+
+ mfd_assert_shrink(fd2);
+ mfd_assert_grow(fd2);
+
+ close(fd2);
close(fd);
}
@@ -801,12 +986,23 @@ static void test_share_mmap(void)
* 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(void)
+static void test_share_open(char *banner, char *b_suffix)
{
int fd, fd2;
+ /*
+ * hugetlbfs does not contain sealing support. So test basic
+ * functionality of using /proc fd via hugetlbfs_proc_open
+ */
+ if (hugetlbfs_test) {
+ hugetlbfs_proc_open(b_suffix);
+ return;
+ }
+
+ printf("%s %s %s\n", MEMFD_STR, banner, b_suffix);
+
fd = mfd_assert_new("kern_memfd_share_open",
- MFD_DEF_SIZE,
+ mfd_def_size,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
mfd_assert_has_seals(fd, 0);
@@ -841,13 +1037,19 @@ static void test_share_open(void)
* Test sharing via fork()
* Test whether seal-modifications work as expected with forked childs.
*/
-static void test_share_fork(void)
+static void test_share_fork(char *banner, char *b_suffix)
{
int fd;
pid_t pid;
+ /* hugetlbfs does not contain sealing support */
+ if (hugetlbfs_test)
+ return;
+
+ printf("%s %s %s\n", MEMFD_STR, banner, b_suffix);
+
fd = mfd_assert_new("kern_memfd_share_fork",
- MFD_DEF_SIZE,
+ mfd_def_size,
MFD_CLOEXEC | MFD_ALLOW_SEALING);
mfd_assert_has_seals(fd, 0);
@@ -870,40 +1072,40 @@ int main(int argc, char **argv)
{
pid_t pid;
- printf("memfd: CREATE\n");
+ 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;
+ mfd_def_size = hpage_size * 2;
+ }
+ }
+
test_create();
- printf("memfd: BASIC\n");
test_basic();
- printf("memfd: SEAL-WRITE\n");
test_seal_write();
- printf("memfd: SEAL-SHRINK\n");
test_seal_shrink();
- printf("memfd: SEAL-GROW\n");
test_seal_grow();
- printf("memfd: SEAL-RESIZE\n");
test_seal_resize();
- printf("memfd: SHARE-DUP\n");
- test_share_dup();
- printf("memfd: SHARE-MMAP\n");
- test_share_mmap();
- printf("memfd: SHARE-OPEN\n");
- test_share_open();
- printf("memfd: SHARE-FORK\n");
- test_share_fork();
+ 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);
- printf("memfd: SHARE-DUP (shared file-table)\n");
- test_share_dup();
- printf("memfd: SHARE-MMAP (shared file-table)\n");
- test_share_mmap();
- printf("memfd: SHARE-OPEN (shared file-table)\n");
- test_share_open();
- printf("memfd: SHARE-FORK (shared file-table)\n");
- test_share_fork();
+ 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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 19:07:24 +0000