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Re: Gold Linker Patch: Introduce the "retpoline" x86 mitigation technique for variant #2 of the speculative execution vulnerabilities disclosed today, specifically identified by CVE-2017-5715 and in some places called "spectre".

From: Florian Weimer <fweimer at redhat dot com>
To: Rui Ueyama <ruiu at google dot com>, Sriraman Tallam <tmsriram at google dot com>
Cc: Cary Coutant <ccoutant at gmail dot com>, Chandler Carruth <chandlerc at google dot com>, binutils <binutils at sourceware dot org>, Reid Kleckner <rnk at google dot com>, Eric Christopher <echristo at google dot com>, Brooks Moses <bmoses at google dot com>, Sidney Hummert <shummert at google dot com>, Xinliang David Li <davidxl at google dot com>, Rahul Chaudhry <rahulchaudhry at google dot com>
Date: Mon, 8 Jan 2018 20:01:16 +0100
Subject: Re: Gold Linker Patch: Introduce the "retpoline" x86 mitigation technique for variant #2 of the speculative execution vulnerabilities disclosed today, specifically identified by CVE-2017-5715 and in some places called "spectre".
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References: <CAAs8HmzJkLiGaUWf9czpNfEejM=uCP=zFvudADEuxsA2wHk+fQ@mail.gmail.com> <CAJimCsGGcXCxQUWD9XGmEHdJ+w01Tr0u29yowA9b16YGHHxMkA@mail.gmail.com> <17cb3295-626f-ba0f-7458-c13eaea24d2b@redhat.com> <CAJimCsE6bZ9VwKTfh9dFvT1HmNb==0Kxh6EJQQWXGoH-U=Epsg@mail.gmail.com> <CAGCO0KhMmBJXuWbb89ZG6tgpVHgmxkE5-xEmMikBjPkVQBDmPA@mail.gmail.com> <CAJimCsFh4c+JgR27i6kVEqexvbfkJJERZ7v7bp6b4JYbR2nUqg@mail.gmail.com> <CAAs8HmyztZxr64OF1q8Vuj=mBeAJXfRS7qssdADDiS5QA3sFpg@mail.gmail.com> <e7ca7f34-08bf-5024-568a-5f47e31a998a@redhat.com> <CAAs8HmxT_3nBxBhTGLARV8NX+G3K8SbH8_J9eGX8prmnibPm7Q@mail.gmail.com> <277ce2e7-88bf-b1ab-11e8-a9c53b6a9100@redhat.com> <CAAs8Hmzja3v9EZnLQSvS8P8NOQn3VHhYuOHAnFP-budxz+xghw@mail.gmail.com> <CAJENXguR9=L8zbGbttnLc_Up_ONh-diX1ULJvn7P5A9=9ebhOQ@mail.gmail.com>

On 01/08/2018 07:51 PM, Rui Ueyama wrote:

A drawback of using BIND_NOW is that an application that has a PLT entry
that cannot be resolved but not used fails to start with that option.

That can be a good or bad thing, depending on your perspective. Withmore and more use of symbol versioning, the point is increasingly mootbecause the set of symbol versions is not checked lazily.


Thanks,
Florian

Follow-Ups:
- Re: Gold Linker Patch: Introduce the "retpoline" x86 mitigation technique for variant #2 of the speculative execution vulnerabilities disclosed today, specifically identified by CVE-2017-5715 and in some places called "spectre".
  - From: Sriraman Tallam via binutils

References:

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