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Re: Read-only data in ELF libraries may be remapped writable at runtime (upcoming NDSS'17 paper)

From: Xinyang Ge <xxg113 at cse dot psu dot edu>
To: Cary Coutant <ccoutant at gmail dot com>
Cc: Alan Modra <amodra at gmail dot com>, Mathias Payer <mathias dot payer at nebelwelt dot net>, Florian Weimer <fweimer at redhat dot com>, Binutils <binutils at sourceware dot org>, libc-alpha at sourceware dot org, Trent Jaeger <tjaeger at cse dot psu dot edu>
Date: Tue, 27 Dec 2016 22:51:45 -0800
Subject: Re: Read-only data in ELF libraries may be remapped writable at runtime (upcoming NDSS'17 paper)
Authentication-results: sourceware.org; auth=none
References: <ec97c532-6576-8eec-05b0-1c206293b1b0@nebelwelt.net> <5bb116b9-2633-bb9d-bd93-edece2fc56ec@redhat.com> <20161223143554.GG2896@bubble.grove.modra.org> <b4ef9e7d-0c69-e08c-cd08-b4033835b999@nebelwelt.net> <b0462cbd-5322-c7ab-66bb-d9f46a0991b2@redhat.com> <A492920E-0B50-400F-B3FA-0A142364018F@nebelwelt.net> <1f4b9a13-3d00-9782-1190-23dc6eb0d804@redhat.com> <b0b8ef76-28d8-5b2d-d3e8-ac28b22c075d@nebelwelt.net> <20161226082913.GD340@bubble.grove.modra.org> <CAJimCsGb732rAhMuqyFZ+ieK-KouG26yj+1LhVcEQ2o-bBevsw@mail.gmail.com>

On Tue, Dec 27, 2016 at 9:48 PM, Cary Coutant <ccoutant@gmail.com> wrote:
>
> ... then migrated over the the gcc list ...
>
>    https://gcc.gnu.org/ml/gcc/2016-04/msg00110.html

Cary,

Thanks for the pointer to the email thread.  From the conversation, it
seemed possible that the DSO and the executable can have two different
views of certain variables (presumably due to variable duplication/copy
relocation).  We have considered this possibility before but found
that as long as the DSO uses the GOT to access its exported variables,
the situation will not occur.

Do you have more details on how this situation occurred in practice?

Xinyang

Follow-Ups:
- Re: Read-only data in ELF libraries may be remapped writable at runtime (upcoming NDSS'17 paper)
  - From: Cary Coutant

References:
- Read-only data in ELF libraries may be remapped writable at runtime (upcoming NDSS'17 paper)
  - From: Mathias Payer
- Re: Read-only data in ELF libraries may be remapped writable at runtime (upcoming NDSS'17 paper)
  - From: Florian Weimer
- Re: Read-only data in ELF libraries may be remapped writable at runtime (upcoming NDSS'17 paper)
  - From: Alan Modra
- Re: Read-only data in ELF libraries may be remapped writable at runtime (upcoming NDSS'17 paper)
  - From: Mathias Payer
- Re: Read-only data in ELF libraries may be remapped writable at runtime (upcoming NDSS'17 paper)
  - From: Florian Weimer
- Re: Read-only data in ELF libraries may be remapped writable at runtime (upcoming NDSS'17 paper)
  - From: Mathias Payer
- Re: Read-only data in ELF libraries may be remapped writable at runtime (upcoming NDSS'17 paper)
  - From: Florian Weimer
- Re: Read-only data in ELF libraries may be remapped writable at runtime (upcoming NDSS'17 paper)
  - From: Mathias Payer
- Re: Read-only data in ELF libraries may be remapped writable at runtime (upcoming NDSS'17 paper)
  - From: Alan Modra
- Re: Read-only data in ELF libraries may be remapped writable at runtime (upcoming NDSS'17 paper)
  - From: Cary Coutant

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