[LTP] [PATCH] syscalls/mallinfo201: Add a basic test for mallinfo2 when setting 2G size

[Petr Vorel]

Hi Xu,

> Since these members of mallinfo struct use int data type, it will overflow
> when allocating 2G size. mallinfo() is deprecated and we should use mallinfo2()
> in the future. So we test mallinfo2 whether works well.

> Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com>
> ---
>  configure.ac                                  |  1 +
>  runtest/syscalls                              |  2 +
>  .../syscalls/mallinfo/mallinfo_common.h       | 18 +++++++
>  .../kernel/syscalls/mallinfo2/.gitignore      |  1 +
>  testcases/kernel/syscalls/mallinfo2/Makefile  |  8 ++++
>  .../kernel/syscalls/mallinfo2/mallinfo201.c   | 47 +++++++++++++++++++
nit: Maybe rename test: mallinfo201.c => mallinfo2_01.c ?
Now it looks like mallinfo() 201st test.

>  6 files changed, 77 insertions(+)
>  create mode 100644 testcases/kernel/syscalls/mallinfo2/.gitignore
>  create mode 100644 testcases/kernel/syscalls/mallinfo2/Makefile
>  create mode 100644 testcases/kernel/syscalls/mallinfo2/mallinfo201.c

...
> diff --git a/testcases/kernel/syscalls/mallinfo/mallinfo_common.h b/testcases/kernel/syscalls/mallinfo/mallinfo_common.h
> index a00cc7a64..e7737b270 100644
> --- a/testcases/kernel/syscalls/mallinfo/mallinfo_common.h
> +++ b/testcases/kernel/syscalls/mallinfo/mallinfo_common.h
> @@ -28,4 +28,22 @@ static inline void print_mallinfo(const char *msg, struct mallinfo *m)
>  }
>  #endif

> +#ifdef HAVE_MALLINFO2
> +static inline void print_mallinfo2(const char *msg, struct mallinfo2 *m)
> +{
> +	tst_res(TINFO, "%s...", msg);
> +#define P2(f) tst_res(TINFO, "%s: %ld", #f, m->f)
> +	P2(arena);
> +	P2(ordblks);
> +	P2(smblks);
> +	P2(hblks);
> +	P2(hblkhd);
> +	P2(usmblks);
> +	P2(fsmblks);
> +	P2(uordblks);
> +	P2(fordblks);
> +	P2(keepcost);
> +}
> +#endif

BTW did you copy this from glibc? (and previously in 7eb7a97a1)?
Code is similar as that one in malloc/tst-mallinfo2.c in glibc,
which you modified.

I guess we should also add glibc copyright to mallinfo_common.h
Copyright (C) 2020 Free Software Foundation, Inc.
(+ probably keep our)

...
> diff --git a/testcases/kernel/syscalls/mallinfo2/Makefile b/testcases/kernel/syscalls/mallinfo2/Makefile
> new file mode 100644
> index 000000000..044619fb8
> --- /dev/null
> +++ b/testcases/kernel/syscalls/mallinfo2/Makefile
> @@ -0,0 +1,8 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later
> +# Copyright (c) International Business Machines  Corp., 2001
Here should be your or LTP copyright with 2021.

> +
> +top_srcdir		?= ../../../..
> +
> +include $(top_srcdir)/include/mk/testcases.mk
CFLAGS += -I../mallinfo
(see description below)

> +
> +include $(top_srcdir)/include/mk/generic_leaf_target.mk
...
> --- /dev/null
> +++ b/testcases/kernel/syscalls/mallinfo2/mallinfo201.c
> @@ -0,0 +1,47 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (c) 2021 FUJITSU LIMITED. All rights reserved.
> + * Author: Yang Xu <xuyang2018.jy@fujitsu.com>
> + */
> +
> +/*\
> + * [DESCRIPTION]
> + *
> + * Basic mallinfo2() test. Test the member of struct mallinfo2
> + * whether overflow when setting 2G size. mallinfo() is deprecated
> + * since the type used for the fields is too small. We should use
> + * mallinfo2() and it was added since glibc 2.33.
> + */

I'd format it a bit and remove info which is not related to the test and people
can find in man page.

/*\
 * [DESCRIPTION]
 *
 * Basic mallinfo2() test.
 *
 * Test members of struct mallinfo2() whether overflow when setting 2G size.
 */

> +#include "../mallinfo/mallinfo_common.h"
Please use
#include "mallinfo_common.h"

and add include path to to Makefile
CFLAGS += -I../mallinfo

> +#include "tst_safe_macros.h"
> +
> +#ifdef HAVE_MALLINFO2
> +
> +void test_mallinfo2(void)
> +{
> +	struct mallinfo2 info;
> +	char *buf;
> +	size_t size = 2UL * 1024UL * 1024UL * 1024UL;
> +
> +	buf = malloc(size);
> +	if (!buf) {
> +		tst_res(TCONF, "Current system can not malloc 2G space, skip it");
> +		return;
> +	}
BTW sometimes I wonder if we should have something like SAFE_*() functions which
would result with TCONF, not with TBROK.

> +	info = mallinfo2();
> +	if (info.hblkhd < size) {
> +		print_mallinfo2("Test malloc 2G", &info);
> +		tst_brk(TFAIL, "The member of struct mallinfo2 overflow?");
> +	}
> +	tst_res(TPASS, "The member of struct mallinfo2 doesn't overflow");
> +	free(buf);
> +}
> +
> +static struct tst_test test = {
> +	.test_all = test_mallinfo2,
> +};
> +
> +#else
> +TST_TEST_TCONF("system doesn't implement non-POSIX mallinfo2()");
> +#endif

The rest LGTM.

Kind regards,
Petr