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authorLinus Torvalds <torvalds@linux-foundation.org>2017-09-06 20:49:49 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-06 20:49:49 -0700
commitd34fc1adf01ff87026da85fb972dc259dc347540 (patch)
tree27356073d423187157b7cdb69da32b53102fb9e7 /tools
parent1c9fe4409ce3e9c78b1ed96ee8ed699d4f03bf33 (diff)
parentd2cd9ede6e193dd7d88b6d27399e96229a551b19 (diff)
downloadlinux-d34fc1adf01ff87026da85fb972dc259dc347540.tar.bz2
Merge branch 'akpm' (patches from Andrew)
Merge updates from Andrew Morton: - various misc bits - DAX updates - OCFS2 - most of MM * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (119 commits) mm,fork: introduce MADV_WIPEONFORK x86,mpx: make mpx depend on x86-64 to free up VMA flag mm: add /proc/pid/smaps_rollup mm: hugetlb: clear target sub-page last when clearing huge page mm: oom: let oom_reap_task and exit_mmap run concurrently swap: choose swap device according to numa node mm: replace TIF_MEMDIE checks by tsk_is_oom_victim mm, oom: do not rely on TIF_MEMDIE for memory reserves access z3fold: use per-cpu unbuddied lists mm, swap: don't use VMA based swap readahead if HDD is used as swap mm, swap: add sysfs interface for VMA based swap readahead mm, swap: VMA based swap readahead mm, swap: fix swap readahead marking mm, swap: add swap readahead hit statistics mm/vmalloc.c: don't reinvent the wheel but use existing llist API mm/vmstat.c: fix wrong comment selftests/memfd: add memfd_create hugetlbfs selftest mm/shmem: add hugetlbfs support to memfd_create() mm, devm_memremap_pages: use multi-order radix for ZONE_DEVICE lookups mm/vmalloc.c: halve the number of comparisons performed in pcpu_get_vm_areas() ...
Diffstat (limited to 'tools')
-rw-r--r--tools/testing/selftests/memfd/Makefile2
-rw-r--r--tools/testing/selftests/memfd/memfd_test.c372
-rw-r--r--tools/testing/selftests/memfd/run_tests.sh69
-rw-r--r--tools/testing/selftests/vm/userfaultfd.c279
4 files changed, 624 insertions, 98 deletions
diff --git a/tools/testing/selftests/memfd/Makefile b/tools/testing/selftests/memfd/Makefile
index ad8a0897e47f..bc9d02d615da 100644
--- a/tools/testing/selftests/memfd/Makefile
+++ b/tools/testing/selftests/memfd/Makefile
@@ -3,7 +3,7 @@ CFLAGS += -I../../../../include/uapi/
CFLAGS += -I../../../../include/
CFLAGS += -I../../../../usr/include/
-TEST_PROGS := run_fuse_test.sh
+TEST_PROGS := run_tests.sh
TEST_GEN_FILES := memfd_test fuse_mnt fuse_test
fuse_mnt.o: CFLAGS += $(shell pkg-config fuse --cflags)
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");
diff --git a/tools/testing/selftests/memfd/run_tests.sh b/tools/testing/selftests/memfd/run_tests.sh
new file mode 100644
index 000000000000..daabb350697c
--- /dev/null
+++ b/tools/testing/selftests/memfd/run_tests.sh
@@ -0,0 +1,69 @@
+#!/bin/bash
+# please run as root
+
+#
+# Normal tests requiring no special resources
+#
+./run_fuse_test.sh
+./memfd_test
+
+#
+# To test memfd_create with hugetlbfs, there needs to be hpages_test
+# huge pages free. Attempt to allocate enough pages to test.
+#
+hpages_test=8
+
+#
+# Get count of free huge pages from /proc/meminfo
+#
+while read name size unit; do
+ if [ "$name" = "HugePages_Free:" ]; then
+ freepgs=$size
+ fi
+done < /proc/meminfo
+
+#
+# If not enough free huge pages for test, attempt to increase
+#
+if [ -n "$freepgs" ] && [ $freepgs -lt $hpages_test ]; then
+ nr_hugepgs=`cat /proc/sys/vm/nr_hugepages`
+ hpages_needed=`expr $hpages_test - $freepgs`
+
+ echo 3 > /proc/sys/vm/drop_caches
+ echo $(( $hpages_needed + $nr_hugepgs )) > /proc/sys/vm/nr_hugepages
+ if [ $? -ne 0 ]; then
+ echo "Please run this test as root"
+ exit 1
+ fi
+ while read name size unit; do
+ if [ "$name" = "HugePages_Free:" ]; then
+ freepgs=$size
+ fi
+ done < /proc/meminfo
+fi
+
+#
+# If still not enough huge pages available, exit. But, give back any huge
+# pages potentially allocated above.
+#
+if [ $freepgs -lt $hpages_test ]; then
+ # nr_hugepgs non-zero only if we attempted to increase
+ if [ -n "$nr_hugepgs" ]; then
+ echo $nr_hugepgs > /proc/sys/vm/nr_hugepages
+ fi
+ printf "Not enough huge pages available (%d < %d)\n" \
+ $freepgs $needpgs
+ exit 1
+fi
+
+#
+# Run the hugetlbfs test
+#
+./memfd_test hugetlbfs
+
+#
+# Give back any huge pages allocated for the test
+#
+if [ -n "$nr_hugepgs" ]; then
+ echo $nr_hugepgs > /proc/sys/vm/nr_hugepages
+fi
diff --git a/tools/testing/selftests/vm/userfaultfd.c b/tools/testing/selftests/vm/userfaultfd.c
index 1eae79ae5b4e..a2c53a3d223d 100644
--- a/tools/testing/selftests/vm/userfaultfd.c
+++ b/tools/testing/selftests/vm/userfaultfd.c
@@ -66,6 +66,8 @@
#include <sys/wait.h>
#include <pthread.h>
#include <linux/userfaultfd.h>
+#include <setjmp.h>
+#include <stdbool.h>
#ifdef __NR_userfaultfd
@@ -82,11 +84,17 @@ static int bounces;
#define TEST_SHMEM 3
static int test_type;
+/* exercise the test_uffdio_*_eexist every ALARM_INTERVAL_SECS */
+#define ALARM_INTERVAL_SECS 10
+static volatile bool test_uffdio_copy_eexist = true;
+static volatile bool test_uffdio_zeropage_eexist = true;
+
+static bool map_shared;
static int huge_fd;
static char *huge_fd_off0;
static unsigned long long *count_verify;
static int uffd, uffd_flags, finished, *pipefd;
-static char *area_src, *area_dst;
+static char *area_src, *area_src_alias, *area_dst, *area_dst_alias;
static char *zeropage;
pthread_attr_t attr;
@@ -125,6 +133,9 @@ static void anon_allocate_area(void **alloc_area)
}
}
+static void noop_alias_mapping(__u64 *start, size_t len, unsigned long offset)
+{
+}
/* HugeTLB memory */
static int hugetlb_release_pages(char *rel_area)
@@ -145,17 +156,51 @@ static int hugetlb_release_pages(char *rel_area)
static void hugetlb_allocate_area(void **alloc_area)
{
+ void *area_alias = NULL;
+ char **alloc_area_alias;
*alloc_area = mmap(NULL, nr_pages * page_size, PROT_READ | PROT_WRITE,
- MAP_PRIVATE | MAP_HUGETLB, huge_fd,
- *alloc_area == area_src ? 0 :
- nr_pages * page_size);
+ (map_shared ? MAP_SHARED : MAP_PRIVATE) |
+ MAP_HUGETLB,
+ huge_fd, *alloc_area == area_src ? 0 :
+ nr_pages * page_size);
if (*alloc_area == MAP_FAILED) {
fprintf(stderr, "mmap of hugetlbfs file failed\n");
*alloc_area = NULL;
}
- if (*alloc_area == area_src)
+ if (map_shared) {
+ area_alias = mmap(NULL, nr_pages * page_size, PROT_READ | PROT_WRITE,
+ MAP_SHARED | MAP_HUGETLB,
+ huge_fd, *alloc_area == area_src ? 0 :
+ nr_pages * page_size);
+ if (area_alias == MAP_FAILED) {
+ if (munmap(*alloc_area, nr_pages * page_size) < 0)
+ perror("hugetlb munmap"), exit(1);
+ *alloc_area = NULL;
+ return;
+ }
+ }
+ if (*alloc_area == area_src) {
huge_fd_off0 = *alloc_area;
+ alloc_area_alias = &area_src_alias;
+ } else {
+ alloc_area_alias = &area_dst_alias;
+ }
+ if (area_alias)
+ *alloc_area_alias = area_alias;
+}
+
+static void hugetlb_alias_mapping(__u64 *start, size_t len, unsigned long offset)
+{
+ if (!map_shared)
+ return;
+ /*
+ * We can't zap just the pagetable with hugetlbfs because
+ * MADV_DONTEED won't work. So exercise -EEXIST on a alias
+ * mapping where the pagetables are not established initially,
+ * this way we'll exercise the -EEXEC at the fs level.
+ */
+ *start = (unsigned long) area_dst_alias + offset;
}
/* Shared memory */
@@ -185,6 +230,7 @@ struct uffd_test_ops {
unsigned long expected_ioctls;
void (*allocate_area)(void **alloc_area);
int (*release_pages)(char *rel_area);
+ void (*alias_mapping)(__u64 *start, size_t len, unsigned long offset);
};
#define ANON_EXPECTED_IOCTLS ((1 << _UFFDIO_WAKE) | \
@@ -195,18 +241,21 @@ static struct uffd_test_ops anon_uffd_test_ops = {
.expected_ioctls = ANON_EXPECTED_IOCTLS,
.allocate_area = anon_allocate_area,
.release_pages = anon_release_pages,
+ .alias_mapping = noop_alias_mapping,
};
static struct uffd_test_ops shmem_uffd_test_ops = {
- .expected_ioctls = UFFD_API_RANGE_IOCTLS_BASIC,
+ .expected_ioctls = ANON_EXPECTED_IOCTLS,
.allocate_area = shmem_allocate_area,
.release_pages = shmem_release_pages,
+ .alias_mapping = noop_alias_mapping,
};
static struct uffd_test_ops hugetlb_uffd_test_ops = {
.expected_ioctls = UFFD_API_RANGE_IOCTLS_BASIC,
.allocate_area = hugetlb_allocate_area,
.release_pages = hugetlb_release_pages,
+ .alias_mapping = hugetlb_alias_mapping,
};
static struct uffd_test_ops *uffd_test_ops;
@@ -331,6 +380,23 @@ static void *locking_thread(void *arg)
return NULL;
}
+static void retry_copy_page(int ufd, struct uffdio_copy *uffdio_copy,
+ unsigned long offset)
+{
+ uffd_test_ops->alias_mapping(&uffdio_copy->dst,
+ uffdio_copy->len,
+ offset);
+ if (ioctl(ufd, UFFDIO_COPY, uffdio_copy)) {
+ /* real retval in ufdio_copy.copy */
+ if (uffdio_copy->copy != -EEXIST)
+ fprintf(stderr, "UFFDIO_COPY retry error %Ld\n",
+ uffdio_copy->copy), exit(1);
+ } else {
+ fprintf(stderr, "UFFDIO_COPY retry unexpected %Ld\n",
+ uffdio_copy->copy), exit(1);
+ }
+}
+
static int copy_page(int ufd, unsigned long offset)
{
struct uffdio_copy uffdio_copy;
@@ -351,8 +417,13 @@ static int copy_page(int ufd, unsigned long offset)
} else if (uffdio_copy.copy != page_size) {
fprintf(stderr, "UFFDIO_COPY unexpected copy %Ld\n",
uffdio_copy.copy), exit(1);
- } else
+ } else {
+ if (test_uffdio_copy_eexist) {
+ test_uffdio_copy_eexist = false;
+ retry_copy_page(ufd, &uffdio_copy, offset);
+ }
return 1;
+ }
return 0;
}
@@ -408,6 +479,7 @@ static void *uffd_poll_thread(void *arg)
userfaults++;
break;
case UFFD_EVENT_FORK:
+ close(uffd);
uffd = msg.arg.fork.ufd;
pollfd[0].fd = uffd;
break;
@@ -572,6 +644,17 @@ static int userfaultfd_open(int features)
return 0;
}
+sigjmp_buf jbuf, *sigbuf;
+
+static void sighndl(int sig, siginfo_t *siginfo, void *ptr)
+{
+ if (sig == SIGBUS) {
+ if (sigbuf)
+ siglongjmp(*sigbuf, 1);
+ abort();
+ }
+}
+
/*
* For non-cooperative userfaultfd test we fork() a process that will
* generate pagefaults, will mremap the area monitored by the
@@ -585,19 +668,59 @@ static int userfaultfd_open(int features)
* The release of the pages currently generates event for shmem and
* anonymous memory (UFFD_EVENT_REMOVE), hence it is not checked
* for hugetlb.
+ * For signal test(UFFD_FEATURE_SIGBUS), signal_test = 1, we register
+ * monitored area, generate pagefaults and test that signal is delivered.
+ * Use UFFDIO_COPY to allocate missing page and retry. For signal_test = 2
+ * test robustness use case - we release monitored area, fork a process
+ * that will generate pagefaults and verify signal is generated.
+ * This also tests UFFD_FEATURE_EVENT_FORK event along with the signal
+ * feature. Using monitor thread, verify no userfault events are generated.
*/
-static int faulting_process(void)
+static int faulting_process(int signal_test)
{
unsigned long nr;
unsigned long long count;
unsigned long split_nr_pages;
+ unsigned long lastnr;
+ struct sigaction act;
+ unsigned long signalled = 0;
if (test_type != TEST_HUGETLB)
split_nr_pages = (nr_pages + 1) / 2;
else
split_nr_pages = nr_pages;
+ if (signal_test) {
+ sigbuf = &jbuf;
+ memset(&act, 0, sizeof(act));
+ act.sa_sigaction = sighndl;
+ act.sa_flags = SA_SIGINFO;
+ if (sigaction(SIGBUS, &act, 0)) {
+ perror("sigaction");
+ return 1;
+ }
+ lastnr = (unsigned long)-1;
+ }
+
for (nr = 0; nr < split_nr_pages; nr++) {
+ if (signal_test) {
+ if (sigsetjmp(*sigbuf, 1) != 0) {
+ if (nr == lastnr) {
+ fprintf(stderr, "Signal repeated\n");
+ return 1;
+ }
+
+ lastnr = nr;
+ if (signal_test == 1) {
+ if (copy_page(uffd, nr * page_size))
+ signalled++;
+ } else {
+ signalled++;
+ continue;
+ }
+ }
+ }
+
count = *area_count(area_dst, nr);
if (count != count_verify[nr]) {
fprintf(stderr,
@@ -607,6 +730,9 @@ static int faulting_process(void)
}
}
+ if (signal_test)
+ return signalled != split_nr_pages;
+
if (test_type == TEST_HUGETLB)
return 0;
@@ -636,6 +762,23 @@ static int faulting_process(void)
return 0;
}
+static void retry_uffdio_zeropage(int ufd,
+ struct uffdio_zeropage *uffdio_zeropage,
+ unsigned long offset)
+{
+ uffd_test_ops->alias_mapping(&uffdio_zeropage->range.start,
+ uffdio_zeropage->range.len,
+ offset);
+ if (ioctl(ufd, UFFDIO_ZEROPAGE, uffdio_zeropage)) {
+ if (uffdio_zeropage->zeropage != -EEXIST)
+ fprintf(stderr, "UFFDIO_ZEROPAGE retry error %Ld\n",
+ uffdio_zeropage->zeropage), exit(1);
+ } else {
+ fprintf(stderr, "UFFDIO_ZEROPAGE retry unexpected %Ld\n",
+ uffdio_zeropage->zeropage), exit(1);
+ }
+}
+
static int uffdio_zeropage(int ufd, unsigned long offset)
{
struct uffdio_zeropage uffdio_zeropage;
@@ -670,8 +813,14 @@ static int uffdio_zeropage(int ufd, unsigned long offset)
if (uffdio_zeropage.zeropage != page_size) {
fprintf(stderr, "UFFDIO_ZEROPAGE unexpected %Ld\n",
uffdio_zeropage.zeropage), exit(1);
- } else
+ } else {
+ if (test_uffdio_zeropage_eexist) {
+ test_uffdio_zeropage_eexist = false;
+ retry_uffdio_zeropage(ufd, &uffdio_zeropage,
+ offset);
+ }
return 1;
+ }
} else {
fprintf(stderr,
"UFFDIO_ZEROPAGE succeeded %Ld\n",
@@ -761,7 +910,7 @@ static int userfaultfd_events_test(void)
perror("fork"), exit(1);
if (!pid)
- return faulting_process();
+ return faulting_process(0);
waitpid(pid, &err, 0);
if (err)
@@ -778,6 +927,72 @@ static int userfaultfd_events_test(void)
return userfaults != nr_pages;
}
+static int userfaultfd_sig_test(void)
+{
+ struct uffdio_register uffdio_register;
+ unsigned long expected_ioctls;
+ unsigned long userfaults;
+ pthread_t uffd_mon;
+ int err, features;
+ pid_t pid;
+ char c;
+
+ printf("testing signal delivery: ");
+ fflush(stdout);
+
+ if (uffd_test_ops->release_pages(area_dst))
+ return 1;
+
+ features = UFFD_FEATURE_EVENT_FORK|UFFD_FEATURE_SIGBUS;
+ if (userfaultfd_open(features) < 0)
+ return 1;
+ fcntl(uffd, F_SETFL, uffd_flags | O_NONBLOCK);
+
+ uffdio_register.range.start = (unsigned long) area_dst;
+ uffdio_register.range.len = nr_pages * page_size;
+ uffdio_register.mode = UFFDIO_REGISTER_MODE_MISSING;
+ if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register))
+ fprintf(stderr, "register failure\n"), exit(1);
+
+ expected_ioctls = uffd_test_ops->expected_ioctls;
+ if ((uffdio_register.ioctls & expected_ioctls) !=
+ expected_ioctls)
+ fprintf(stderr,
+ "unexpected missing ioctl for anon memory\n"),
+ exit(1);
+
+ if (faulting_process(1))
+ fprintf(stderr, "faulting process failed\n"), exit(1);
+
+ if (uffd_test_ops->release_pages(area_dst))
+ return 1;
+
+ if (pthread_create(&uffd_mon, &attr, uffd_poll_thread, NULL))
+ perror("uffd_poll_thread create"), exit(1);
+
+ pid = fork();
+ if (pid < 0)
+ perror("fork"), exit(1);
+
+ if (!pid)
+ exit(faulting_process(2));
+
+ waitpid(pid, &err, 0);
+ if (err)
+ fprintf(stderr, "faulting process failed\n"), exit(1);
+
+ if (write(pipefd[1], &c, sizeof(c)) != sizeof(c))
+ perror("pipe write"), exit(1);
+ if (pthread_join(uffd_mon, (void **)&userfaults))
+ return 1;
+
+ printf("done.\n");
+ if (userfaults)
+ fprintf(stderr, "Signal test failed, userfaults: %ld\n",
+ userfaults);
+ close(uffd);
+ return userfaults != 0;
+}
static int userfaultfd_stress(void)
{
void *area;
@@ -879,6 +1094,15 @@ static int userfaultfd_stress(void)
return 1;
}
+ if (area_dst_alias) {
+ uffdio_register.range.start = (unsigned long)
+ area_dst_alias;
+ if (ioctl(uffd, UFFDIO_REGISTER, &uffdio_register)) {
+ fprintf(stderr, "register failure alias\n");
+ return 1;
+ }
+ }
+
/*
* The madvise done previously isn't enough: some
* uffd_thread could have read userfaults (one of
@@ -912,9 +1136,17 @@ static int userfaultfd_stress(void)
/* unregister */
if (ioctl(uffd, UFFDIO_UNREGISTER, &uffdio_register.range)) {
- fprintf(stderr, "register failure\n");
+ fprintf(stderr, "unregister failure\n");
return 1;
}
+ if (area_dst_alias) {
+ uffdio_register.range.start = (unsigned long) area_dst;
+ if (ioctl(uffd, UFFDIO_UNREGISTER,
+ &uffdio_register.range)) {
+ fprintf(stderr, "unregister failure alias\n");
+ return 1;
+ }
+ }
/* verification */
if (bounces & BOUNCE_VERIFY) {
@@ -936,6 +1168,10 @@ static int userfaultfd_stress(void)
area_src = area_dst;
area_dst = tmp_area;
+ tmp_area = area_src_alias;
+ area_src_alias = area_dst_alias;
+ area_dst_alias = tmp_area;
+
printf("userfaults:");
for (cpu = 0; cpu < nr_cpus; cpu++)
printf(" %lu", userfaults[cpu]);
@@ -946,7 +1182,8 @@ static int userfaultfd_stress(void)
return err;
close(uffd);
- return userfaultfd_zeropage_test() || userfaultfd_events_test();
+ return userfaultfd_zeropage_test() || userfaultfd_sig_test()
+ || userfaultfd_events_test();
}
/*
@@ -981,7 +1218,12 @@ static void set_test_type(const char *type)
} else if (!strcmp(type, "hugetlb")) {
test_type = TEST_HUGETLB;
uffd_test_ops = &hugetlb_uffd_test_ops;
+ } else if (!strcmp(type, "hugetlb_shared")) {
+ map_shared = true;
+ test_type = TEST_HUGETLB;
+ uffd_test_ops = &hugetlb_uffd_test_ops;
} else if (!strcmp(type, "shmem")) {
+ map_shared = true;
test_type = TEST_SHMEM;
uffd_test_ops = &shmem_uffd_test_ops;
} else {
@@ -1001,12 +1243,25 @@ static void set_test_type(const char *type)
fprintf(stderr, "Impossible to run this test\n"), exit(2);
}
+static void sigalrm(int sig)
+{
+ if (sig != SIGALRM)
+ abort();
+ test_uffdio_copy_eexist = true;
+ test_uffdio_zeropage_eexist = true;
+ alarm(ALARM_INTERVAL_SECS);
+}
+
int main(int argc, char **argv)
{
if (argc < 4)
fprintf(stderr, "Usage: <test type> <MiB> <bounces> [hugetlbfs_file]\n"),
exit(1);
+ if (signal(SIGALRM, sigalrm) == SIG_ERR)
+ fprintf(stderr, "failed to arm SIGALRM"), exit(1);
+ alarm(ALARM_INTERVAL_SECS);
+
set_test_type(argv[1]);
nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);