linux-kernel - Re: [PATCH 2/8] lib: test_bitmap: add more start-end:offset/len tests

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 26 Jan 2021 19:03:49 -0800
From:   Yury Norov <yury.norov@...il.com>
To:     Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        lizefan@...wei.com, Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>, josh@...htriplett.org,
        Peter Zijlstra <peterz@...radead.org>,
        "Paul E. McKenney" <paulmck@...nel.org>, fweisbec@...il.com,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH 2/8] lib: test_bitmap: add more start-end:offset/len tests

On Tue, Jan 26, 2021 at 9:12 AM Paul Gortmaker
<paul.gortmaker@...driver.com> wrote:
>
> There are inputs to bitmap_parselist() that would probably never
> be entered manually by a person, but might result from some kind of
> automated input generator.  Things like ranges of length 1, or group
> lengths longer than nbits, overlaps, or offsets of zero.
>
> Adding these tests serve two purposes:
>
> 1) document what might seem odd but nonetheless valid input.
>
> 2) don't regress from what we currently accept as valid.
>
> Cc: Yury Norov <yury.norov@...il.com>
> Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
> ---
>  lib/test_bitmap.c | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
>
> diff --git a/lib/test_bitmap.c b/lib/test_bitmap.c
> index 3d2cd3b1de84..807d1e8dd59c 100644
> --- a/lib/test_bitmap.c
> +++ b/lib/test_bitmap.c
> @@ -35,6 +35,8 @@ static const unsigned long exp1[] __initconst = {
>         BITMAP_FROM_U64(0x3333333311111111ULL),
>         BITMAP_FROM_U64(0xffffffff77777777ULL),
>         BITMAP_FROM_U64(0),
> +       BITMAP_FROM_U64(0x00008000),
> +       BITMAP_FROM_U64(0x80000000),
>  };
>
>  static const unsigned long exp2[] __initconst = {
> @@ -335,6 +337,26 @@ static const struct test_bitmap_parselist parselist_tests[] __initconst = {
>         {0, " ,  ,,  , ,   ",           &exp1[12 * step], 8, 0},
>         {0, " ,  ,,  , ,   \n",         &exp1[12 * step], 8, 0},
>
> +       {0, "0-0",                      &exp1[0], 32, 0},
> +       {0, "1-1",                      &exp1[1 * step], 32, 0},
> +       {0, "15-15",                    &exp1[13 * step], 32, 0},
> +       {0, "31-31",                    &exp1[14 * step], 32, 0},
> +
> +       {0, "0-0:0/1",                  &exp1[12 * step], 32, 0},
> +       {0, "0-0:1/1",                  &exp1[0], 32, 0},
> +       {0, "0-0:1/31",                 &exp1[0], 32, 0},
> +       {0, "0-0:31/31",                &exp1[0], 32, 0},
> +       {0, "1-1:1/1",                  &exp1[1 * step], 32, 0},
> +       {0, "0-15:16/31",               &exp1[2 * step], 32, 0},
> +       {0, "15-15:1/2",                &exp1[13 * step], 32, 0},
> +       {0, "15-15:31/31",              &exp1[13 * step], 32, 0},
> +       {0, "15-31:1/31",               &exp1[13 * step], 32, 0},
> +       {0, "16-31:16/31",              &exp1[3 * step], 32, 0},
> +       {0, "31-31:31/31",              &exp1[14 * step], 32, 0},
> +
> +       {0, "0-31:1/3,1-31:1/3,2-31:1/3",       &exp1[8 * step], 32, 0},
> +       {0, "1-10:8/12,8-31:24/29,0-31:0/3",    &exp1[9 * step], 32, 0},
> +
>         {-EINVAL, "-1", NULL, 8, 0},
>         {-EINVAL, "-0", NULL, 8, 0},
>         {-EINVAL, "10-1", NULL, 8, 0},  /* (start > end) ; also ERANGE */
> --
> 2.17.1

Acked-by: Yury Norov <yury.norov@...il.com>