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SubjectRe: [PATCH v8 2/2] fs: ext4: Modify inode-test.c to use KUnit parameterized testing feature
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On 16/11/20 1:14 am, Marco Elver wrote:
> On Sun, 15 Nov 2020 at 19:59, Arpitha Raghunandan <98.arpi@gmail.com> wrote:
>>
>> Modify fs/ext4/inode-test.c to use the parameterized testing
>> feature of KUnit.
>>
>> Signed-off-by: Arpitha Raghunandan <98.arpi@gmail.com>
>> Signed-off-by: Marco Elver <elver@google.com>
>> ---
>> Changes v7->v8:
>> - Replace strcpy() with strncpy() in timestamp_expectation_to_desc()
>> Changes v6->v7:
>> - Introduce timestamp_expectation_to_desc() to convert param to
>> description.
>> Changes v5->v6:
>> - No change to this patch of the patch series
>> Changes v4->v5:
>> - No change to this patch of the patch series
>> Changes v3->v4:
>> - Modification based on latest implementation of KUnit parameterized testing
>> Changes v2->v3:
>> - Marked hardcoded test data const
>> - Modification based on latest implementation of KUnit parameterized testing
>> Changes v1->v2:
>> - Modification based on latest implementation of KUnit parameterized testing
>>
>> fs/ext4/inode-test.c | 323 ++++++++++++++++++++++---------------------
>> 1 file changed, 167 insertions(+), 156 deletions(-)
>>
>> diff --git a/fs/ext4/inode-test.c b/fs/ext4/inode-test.c
>> index d62d802c9c12..2c0c00c45c6b 100644
>> --- a/fs/ext4/inode-test.c
>> +++ b/fs/ext4/inode-test.c
>> @@ -80,6 +80,148 @@ struct timestamp_expectation {
>> bool lower_bound;
>> };
>>
>> +static const struct timestamp_expectation test_data[] = {
>> + {
>> + .test_case_name = LOWER_BOUND_NEG_NO_EXTRA_BITS_CASE,
>> + .msb_set = true,
>> + .lower_bound = true,
>> + .extra_bits = 0,
>> + .expected = {.tv_sec = -0x80000000LL, .tv_nsec = 0L},
>> + },
>> +
>> + {
>> + .test_case_name = UPPER_BOUND_NEG_NO_EXTRA_BITS_CASE,
>> + .msb_set = true,
>> + .lower_bound = false,
>> + .extra_bits = 0,
>> + .expected = {.tv_sec = -1LL, .tv_nsec = 0L},
>> + },
>> +
>> + {
>> + .test_case_name = LOWER_BOUND_NONNEG_NO_EXTRA_BITS_CASE,
>> + .msb_set = false,
>> + .lower_bound = true,
>> + .extra_bits = 0,
>> + .expected = {0LL, 0L},
>> + },
>> +
>> + {
>> + .test_case_name = UPPER_BOUND_NONNEG_NO_EXTRA_BITS_CASE,
>> + .msb_set = false,
>> + .lower_bound = false,
>> + .extra_bits = 0,
>> + .expected = {.tv_sec = 0x7fffffffLL, .tv_nsec = 0L},
>> + },
>> +
>> + {
>> + .test_case_name = LOWER_BOUND_NEG_LO_1_CASE,
>> + .msb_set = true,
>> + .lower_bound = true,
>> + .extra_bits = 1,
>> + .expected = {.tv_sec = 0x80000000LL, .tv_nsec = 0L},
>> + },
>> +
>> + {
>> + .test_case_name = UPPER_BOUND_NEG_LO_1_CASE,
>> + .msb_set = true,
>> + .lower_bound = false,
>> + .extra_bits = 1,
>> + .expected = {.tv_sec = 0xffffffffLL, .tv_nsec = 0L},
>> + },
>> +
>> + {
>> + .test_case_name = LOWER_BOUND_NONNEG_LO_1_CASE,
>> + .msb_set = false,
>> + .lower_bound = true,
>> + .extra_bits = 1,
>> + .expected = {.tv_sec = 0x100000000LL, .tv_nsec = 0L},
>> + },
>> +
>> + {
>> + .test_case_name = UPPER_BOUND_NONNEG_LO_1_CASE,
>> + .msb_set = false,
>> + .lower_bound = false,
>> + .extra_bits = 1,
>> + .expected = {.tv_sec = 0x17fffffffLL, .tv_nsec = 0L},
>> + },
>> +
>> + {
>> + .test_case_name = LOWER_BOUND_NEG_HI_1_CASE,
>> + .msb_set = true,
>> + .lower_bound = true,
>> + .extra_bits = 2,
>> + .expected = {.tv_sec = 0x180000000LL, .tv_nsec = 0L},
>> + },
>> +
>> + {
>> + .test_case_name = UPPER_BOUND_NEG_HI_1_CASE,
>> + .msb_set = true,
>> + .lower_bound = false,
>> + .extra_bits = 2,
>> + .expected = {.tv_sec = 0x1ffffffffLL, .tv_nsec = 0L},
>> + },
>> +
>> + {
>> + .test_case_name = LOWER_BOUND_NONNEG_HI_1_CASE,
>> + .msb_set = false,
>> + .lower_bound = true,
>> + .extra_bits = 2,
>> + .expected = {.tv_sec = 0x200000000LL, .tv_nsec = 0L},
>> + },
>> +
>> + {
>> + .test_case_name = UPPER_BOUND_NONNEG_HI_1_CASE,
>> + .msb_set = false,
>> + .lower_bound = false,
>> + .extra_bits = 2,
>> + .expected = {.tv_sec = 0x27fffffffLL, .tv_nsec = 0L},
>> + },
>> +
>> + {
>> + .test_case_name = UPPER_BOUND_NONNEG_HI_1_NS_1_CASE,
>> + .msb_set = false,
>> + .lower_bound = false,
>> + .extra_bits = 6,
>> + .expected = {.tv_sec = 0x27fffffffLL, .tv_nsec = 1L},
>> + },
>> +
>> + {
>> + .test_case_name = LOWER_BOUND_NONNEG_HI_1_NS_MAX_CASE,
>> + .msb_set = false,
>> + .lower_bound = true,
>> + .extra_bits = 0xFFFFFFFF,
>> + .expected = {.tv_sec = 0x300000000LL,
>> + .tv_nsec = MAX_NANOSECONDS},
>> + },
>> +
>> + {
>> + .test_case_name = LOWER_BOUND_NONNEG_EXTRA_BITS_1_CASE,
>> + .msb_set = false,
>> + .lower_bound = true,
>> + .extra_bits = 3,
>> + .expected = {.tv_sec = 0x300000000LL, .tv_nsec = 0L},
>> + },
>> +
>> + {
>> + .test_case_name = UPPER_BOUND_NONNEG_EXTRA_BITS_1_CASE,
>> + .msb_set = false,
>> + .lower_bound = false,
>> + .extra_bits = 3,
>> + .expected = {.tv_sec = 0x37fffffffLL, .tv_nsec = 0L},
>> + }
>> +};
>> +
>> +static void timestamp_expectation_to_desc(const struct timestamp_expectation *t,
>> + char *desc)
>> +{
>> + int desc_length = strlen(t->test_case_name);
>> +
>> + strncpy(desc, t->test_case_name, desc_length);
>> + desc[desc_length] = '\0';
>> +}
>
> This unfortunately won't prevent out-of-bounds accesses if the
> description is longer than KUNIT_PARAM_DESC_SIZE.
>
> With strncpy() we want to avoid copying more bytes than the
> destination buffer can hold. This can be done by simply a
> strncpy(desc, t->test_case_name, KUNIT_PARAM_DESC_SIZE). But,
> strncpy() is unsafe in certain cases, too, so the kernel introduced
> strscpy() -- see the note about strncpy() in
> Documentation/process/deprecated.rst. Also have a look at the
> documentation about str{n,l,s}cpy() in lib/string.c.
>
> So, finally, what we want here is just 1 line:
>
> strscpy(desc, t->test_case_name, KUNIT_PARAM_DESC_SIZE);
>

Okay, I'll look this up and make this change for v9.

> Patch 1/2 looks fine though, so hopefully v9 will be final. :-)
>
> Thanks,
> -- Marco
>

Thanks!

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