linux-kernel - Re: [PATCH v15 00/17] arm64: untag user pointers passed to the kernel

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Message-ID: <CAAeHK+yAUsZWhp6xPAbWewX5Nbw+-G3svUyPmhXu5MVeEDKYvA@mail.gmail.com>
Date:   Tue, 28 May 2019 16:14:45 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Kees Cook <keescook@...omium.org>
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Subject: Re: [PATCH v15 00/17] arm64: untag user pointers passed to the kernel

Thanks for a lot of valuable input! I've read through all the replies
and got somewhat lost. What are the changes I need to do to this
series?

1. Should I move untagging for memory syscalls back to the generic
code so other arches would make use of it as well, or should I keep
the arm64 specific memory syscalls wrappers and address the comments
on that patch?

2. Should I make untagging opt-in and controlled by a command line argument?

3. Should I "add Documentation/core-api/user-addresses.rst to describe
proper care and handling of user space pointers with untagged_addr(),
with examples based on all the cases seen so far in this series"?
Which examples specifically should it cover?

Is there something else?