linux-hardening - Re: [PATCH RFC 0/3] powerpc/ps3: refactor strncpy usage

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Date:   Mon, 14 Aug 2023 22:31:10 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Justin Stitt <justinstitt@...gle.com>,
        Geoff Levand <geoff@...radead.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     linux-hardening@...r.kernel.org, Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 0/3] powerpc/ps3: refactor strncpy usage

Justin Stitt <justinstitt@...gle.com> writes:
> On Fri, Aug 11, 2023 at 2:19 PM Justin Stitt <justinstitt@...gle.com> wrote:
>>
>> Within this RFC-series I want to get some comments on two ideas that I
>> have for refactoring the current `strncpy` usage in repository.c.
>>
>> When looking at `make_first_field` we see a u64 is being used to store
>> up to 8 bytes from a literal string. This is slightly suspect to me but
>> it works? In regards to `strncpy` here, it makes the code needlessly
>> complex imo.
>>
>> Please see my two ideas to change this and let me know if any other
>> approaches are more reasonable.
>>
>> Link: https://github.com/KSPP/linux/issues/90
>> Signed-off-by: Justin Stitt <justinstitt@...gle.com>
>> ---
>> Justin Stitt (3):
>>       [RFC] powerpc/ps3: refactor strncpy usage attempt 1
>>       [RFC] powerpc/ps3: refactor strncpy usage attempt 2
>>       [RFC] powerpc/ps3: refactor strncpy usage attempt 2.5
> Errhm, It looks like the diffs after attempt 1 came out poorly and
> probably won't apply cleanly because they were inter-diffed with the
> first patch. Is there a way to let b4 know I wanted each patch diff'd
> against the same SHA and not each other sequentially?

I don't think there is. It always assumes they're a series.

cheers