Re: [PATCH v4 07/10] x86: narrow out of bounds syscalls to sys_read under speculation

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To: Dan Williams <dan.j.williams@xxxxxxxxx>
Subject: Re: [PATCH v4 07/10] x86: narrow out of bounds syscalls to sys_read under speculation
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Tue, 6 Feb 2018 12:43:19 -0800
Cc: Luis Henriques <lhenriques@xxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, linux-arch <linux-arch@xxxxxxxxxxxxxxx>, Kernel Hardening <kernel-hardening@xxxxxxxxxxxxxxxxxx>, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>, X86 ML <x86@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Alan Cox <alan@xxxxxxxxxxxxxxx>
In-reply-to: <CA+55aFzZVL=WVuhJAQDazj59jwnmhUrRRwNgzXS+c-q5yva0iw@mail.gmail.com>
References: <151632009605.21271.11304291057104672116.stgit@dwillia2-desk3.amr.corp.intel.com> <151632014097.21271.16980532033566583357.stgit@dwillia2-desk3.amr.corp.intel.com> <20180206192925.qkmghwsbaysr4iv2@hermes.olymp> <CAPcyv4ihN6fy5-vBtfA0PuwXvCAj8-rMhtQmevh5sdYxbH3Yfw@mail.gmail.com> <CA+55aFxYHX3=HN4P5M0ziSJ08WfjccyhE2T7epS-EC6ZJ6LyjQ@mail.gmail.com> <CAPcyv4i5oORdk-Fzypxw_+gCLUa8f=w1e_n0=47P7uHR-jT6GQ@mail.gmail.com> <CA+55aFzZVL=WVuhJAQDazj59jwnmhUrRRwNgzXS+c-q5yva0iw@mail.gmail.com>

On Tue, Feb 6, 2018 at 12:42 PM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> Sadly, that is *very* easy to miscompile.

Side note: don't read email, go watch the falcon heavy takeoff.

              Linus

References:
- [PATCH v4 00/10] prevent bounds-check bypass via speculative execution
  - From: Dan Williams
- [PATCH v4 07/10] x86: narrow out of bounds syscalls to sys_read under speculation
  - From: Dan Williams
- Re: [PATCH v4 07/10] x86: narrow out of bounds syscalls to sys_read under speculation
  - From: Luis Henriques
- Re: [PATCH v4 07/10] x86: narrow out of bounds syscalls to sys_read under speculation
  - From: Dan Williams
- Re: [PATCH v4 07/10] x86: narrow out of bounds syscalls to sys_read under speculation
  - From: Linus Torvalds
- Re: [PATCH v4 07/10] x86: narrow out of bounds syscalls to sys_read under speculation
  - From: Dan Williams
- Re: [PATCH v4 07/10] x86: narrow out of bounds syscalls to sys_read under speculation
  - From: Linus Torvalds

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