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From:   Sam James <sam@gentoo.org>
To:     Mingye Wang <arthur200126@gmail.com>
Cc:     Alejandro Colomar <alx.manpages@gmail.com>,
        linux-man@vger.kernel.org,
        Erik Pilkington <erik.pilkington@gmail.com>
Subject: Re: [PATCH] feature_test_macros.7: document clang fortify support
Date:   Thu, 23 Mar 2023 05:38:24 +0000
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Mingye Wang <arthur200126@gmail.com> writes:

> Hi Alex,
>
> It looks like Sam James has already documented level 3 of the macro.
> The attached (no, git send-email is not happy with my proxy setup)
> patch only adds some language related to clang. Here's to hoping the
> system is happy with multipart mail.
>
> I've CCed Erik Pilington, since he is the author of the LLVM-svn
> 352665, the change that introduced __builtin_dynamic_object_size() in
> 2019.
>

The patch looks OK to me in terms of the content, apart from the libssp
mention. libssp and stack smashing protection overall is distinct from
fortification.

SSP is where stack canaries are emitted and their value is checked
later on to see if they're intact. Fortification is where certain
functions are replaced with variants that check the size of their
arguments e.g. dst & src and ensure they're big enough. They're distinct.

> Regards,
> Mingye Wang
>
> [2. text/x-patch; 0001-feature_test_macros.7-document-clang-fortify-support.patch]...

best,
sam

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