Re: [PATCH 6/6] memfd-tests: test hugetlbfs sealing

From: Mike Kravetz
Date: Fri Nov 03 2017 - 19:59:46 EST

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On 10/31/2017 11:40 AM, Marc-AndrÃ Lureau wrote:
> Remove most of the special-casing of hugetlbfs now that sealing
> is supported.

The changes below look fine. Just a couple issues.

While discussing patch 4 with David, I realized that we should modify/expand
the fuse seals test to also verify proper functionality with hugetlbfs. I
think this is a requirement.

The output of run_tests.sh looks something like:
opening: ./mnt/memfd
fuse: DONE
memfd: CREATE
memfd: BASIC
memfd: SEAL-WRITE
memfd: SEAL-SHRINK
memfd: SEAL-GROW
memfd: SEAL-RESIZE
memfd: SHARE-DUP
memfd: SHARE-MMAP
memfd: SHARE-OPEN
memfd: SHARE-FORK
memfd: SHARE-DUP (shared file-table)
memfd: SHARE-MMAP (shared file-table)
memfd: SHARE-OPEN (shared file-table)
memfd: SHARE-FORK (shared file-table)
memfd: DONE
memfd: CREATE
memfd: BASIC
memfd: SEAL-WRITE
memfd: SEAL-SHRINK
memfd: SEAL-GROW
memfd: SEAL-RESIZE
memfd: SHARE-DUP
memfd: SHARE-MMAP
memfd: SHARE-OPEN
memfd: SHARE-FORK
memfd: SHARE-DUP (shared file-table)
memfd: SHARE-MMAP (shared file-table)
memfd: SHARE-OPEN (shared file-table)
memfd: SHARE-FORK (shared file-table)
memfd: DONE

It might be nice to distinguish testing of tmpfs and hugetlbfs. The
string '#define MEMFD_STR "memfd:"' is prepended to the output lines.
Perhaps we could do something like:
#define MEMFD_STR "memfd:"
#define MEMFD_HUGE_STR "memfd-hugetlb"
char *memfd_str;

and then in main,
if (hugetlbfs_test)
memfd_str = MEMFD_HUGE_STR;
else
memfd_str = MEMFD_STR;

then prepend output strings with memfd_str.

This is just a suggestion and optional.

--
Mike Kravetz

>
> Signed-off-by: Marc-AndrÃ Lureau <marcandre.lureau@xxxxxxxxxx>
> ---
> tools/testing/selftests/memfd/memfd_test.c | 150 +++--------------------------
> 1 file changed, 15 insertions(+), 135 deletions(-)
>
> diff --git a/tools/testing/selftests/memfd/memfd_test.c b/tools/testing/selftests/memfd/memfd_test.c
> index f94c6d1fb46f..f5028f800107 100644
> --- a/tools/testing/selftests/memfd/memfd_test.c
> +++ b/tools/testing/selftests/memfd/memfd_test.c
> @@ -512,6 +512,10 @@ 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(%d) failed: %m\n", mfd_def_size * 8);
> @@ -532,6 +536,10 @@ 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(%d) failed: %m\n", mfd_def_size * 8);
> @@ -626,18 +634,13 @@ static void test_create(void)
> fd = mfd_assert_new("", 0, 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);
> - }
> + /* 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);
> }
>
> /*
> @@ -648,10 +651,6 @@ 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",
> @@ -696,28 +695,6 @@ static void test_basic(void)
> close(fd);
> }
>
> -/*
> - * 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.
> @@ -726,13 +703,6 @@ 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",
> @@ -759,10 +729,6 @@ 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",
> @@ -789,10 +755,6 @@ 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",
> @@ -819,10 +781,6 @@ 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",
> @@ -841,32 +799,6 @@ static void test_seal_resize(void)
> close(fd);
> }
>
> -/*
> - * 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.
> @@ -875,15 +807,6 @@ 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",
> @@ -926,10 +849,6 @@ 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",
> @@ -954,32 +873,6 @@ static void test_share_mmap(char *banner, char *b_suffix)
> 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);
> -}
> -
> /*
> * Test sealing with open(/proc/self/fd/%d)
> * Via /proc we can get access to a separate file-context for the same memfd.
> @@ -990,15 +883,6 @@ 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",
> @@ -1042,10 +926,6 @@ 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",
>

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