Re: [PATCH v2 6/9] memfd-tests: test hugetlbfs sealing

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On 11/06/2017 06:39 AM, Marc-André Lureau wrote:
> Remove most of the special-casing of hugetlbfs now that sealing
> is supported.
> 
> Signed-off-by: Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>

Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>

-- 
Mike Kravetz

> ---
>  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 845e5f67b6f0..cca957a06525 100644
> --- a/tools/testing/selftests/memfd/memfd_test.c
> +++ b/tools/testing/selftests/memfd/memfd_test.c
> @@ -513,6 +513,10 @@ 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);
> @@ -533,6 +537,10 @@ 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);
> @@ -627,18 +635,13 @@ 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);
>  }
>  
>  /*
> @@ -649,10 +652,6 @@ 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",
> @@ -697,28 +696,6 @@ 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.
> @@ -727,13 +704,6 @@ 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",
> @@ -760,10 +730,6 @@ 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",
> @@ -790,10 +756,6 @@ 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",
> @@ -820,10 +782,6 @@ 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",
> @@ -842,32 +800,6 @@ 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.
> @@ -876,15 +808,6 @@ 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",
> @@ -927,10 +850,6 @@ 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",
> @@ -955,32 +874,6 @@ 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.
> @@ -991,15 +884,6 @@ 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",
> @@ -1043,10 +927,6 @@ 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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