linux-kernel - Re: [PATCH v5 02/12] array_idx: sanitize speculative array de-references

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Message-ID: <CAPcyv4jTbH6As_SC2Po8j5mB6jKLcwMr3Yn=19aTN2yMgBR=iw@mail.gmail.com>
Date:   Tue, 30 Jan 2018 12:13:18 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Cyril Novikov <cnovikov@...x.com>,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        X86 ML <x86@...nel.org>, Will Deacon <will.deacon@....com>,
        Russell King <linux@...linux.org.uk>,
        Ingo Molnar <mingo@...hat.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        "H. Peter Anvin" <hpa@...or.com>, Alan Cox <alan@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>
Subject: Re: [PATCH v5 02/12] array_idx: sanitize speculative array de-references

[ adding Arjan ]

On Tue, Jan 30, 2018 at 11:38 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
[..]
> Anyway, I do think the patches I've seen so far are ok, and the real
> reason I'm writing this email is actually more about future patches:
> do we have a good handle on where these array index sanitations will
> be needed?
>
> Also, while array limit checking was obviously the official
> "spectre-v1" issue, I do wonder if there are possible other issues
> where mispredicted conditional branches can end up leaking
> information?
>
> IOW, is there some work on tooling/analysis/similar? Not asking for
> near-term, but more of a "big picture" question..
>
>             Linus