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SubjectRe: [PATCH kselftest/test] kunit: Always print actual pointer values in asserts
On 3/25/20 10:33 AM, Brendan Higgins wrote:
> On Tue, Mar 24, 2020 at 8:33 PM David Gow <> wrote:
>> On Tue, Dec 3, 2019 at 3:44 PM Brendan Higgins
>> <> wrote:
>>> On Thu, Nov 21, 2019 at 3:51 PM David Gow <> wrote:
>>>> KUnit assertions and expectations will print the values being tested. If
>>>> these are pointers (e.g., KUNIT_EXPECT_PTR_EQ(test, a, b)), these
>>>> pointers are currently printed with the %pK format specifier, which -- to
>>>> prevent information leaks which may compromise, e.g., ASLR -- are often
>>>> either hashed or replaced with ____ptrval____ or similar, making debugging
>>>> tests difficult.
>>>> By replacing %pK with %px as Documentation/core-api/printk-formats.rst
>>>> suggests, we disable this security feature for KUnit assertions and
>>>> expectations, allowing the actual pointer values to be printed. Given
>>>> that KUnit is not intended for use in production kernels, and the
>>>> pointers are only printed on failing tests, this seems like a worthwhile
>>>> tradeoff.
>>> I agree. However, I also remember that others in the past yelled at me
>>> for assuming that KUnit would not be built into production kernels.
>>> I feel like +Kees Cook would have a good opinion on this (or will at
>>> least CC the right people).
>> I'm tempted to take the silence as a sign that no-one is upset by
>> this. Otherwise, consider this a gentle reminder to file any
>> objections you may have. :-)
>> Otherwise, I've confirmed that this still applies cleanly to the
>> latest linux-kselftest/kunit branch, so -- assuming there are no
>> last-minute objections -- this ought to be ready to go.
> Shuah, can you pick this up for 5.7?

Yes. I will pick this up.

-- Shuah

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