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Date:   Thu, 07 Mar 2019 09:10:38 -0800
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Subject: Re: [PATCH 18/20] objtool: Add UACCESS validation
To:     Linus Torvalds <torvalds@linux-foundation.org>,
        Peter Zijlstra <peterz@infradead.org>
CC:     Thomas Gleixner <tglx@linutronix.de>,
        Julien Thierry <julien.thierry@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Andy Lutomirski <luto@amacapital.net>,
        Ingo Molnar <mingo@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        James Morse <james.morse@arm.com>, valentin.schneider@arm.com,
        Brian Gerst <brgerst@gmail.com>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Andrew Lutomirski <luto@kernel.org>,
        Borislav Petkov <bp@alien8.de>,
        Denys Vlasenko <dvlasenk@redhat.com>,
        Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
        Dmitry Vyukov <dvyukov@google.com>,
        Steven Rostedt <rostedt@goodmis.org>
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On March 7, 2019 8:33:26 AM PST, Linus Torvalds <torvalds@linux-foundation.org> wrote:
>On Thu, Mar 7, 2019 at 3:52 AM Peter Zijlstra <peterz@infradead.org>
>wrote:
>>
>> XXX: are we sure we want __memset marked AC-safe?
>
>It's certainly one of the safer functions to call with AC set, but it
>sounds wrong anyway. It's not like it's likely to leak kernel data
>(most memset's are with 0, and even the non-zero ones I can't imagine
>are sensitive - more like poison values etc).
>
>What's the call site that made you go "just add __memset() to the
>list"?
>
>            Linus

Agreed... it seems fishy at least.

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