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From: Florian Weimer <fweimer@redhat.com>
To: Cary Coutant <ccoutant@gmail.com>
Cc: Nick Clifton <nickc@redhat.com>,
	gnu-gabi@sourceware.org, "H.J. Lu" <hjl.tools@gmail.com>
Subject: Re: RFA: Add a new gynamic tag: DT_GNU_GOT_PLT_END
Date: Mon, 01 Jan 2018 00:00:00 -0000	[thread overview]
Message-ID: <f2a6787e-6255-fb40-2865-db646c88575d@redhat.com> (raw)
In-Reply-To: <CAJimCsGiJKYJ37vr3cs9PUDQUp5Yc07T6q=39aMMA7nxinQ_=A@mail.gmail.com>

On 06/26/2018 02:42 AM, Cary Coutant wrote:
>>> OK, so it's a variant of RELRO. I'd prefer using a new program header
>>> type, PT_GNU_PLTGOT, then.
>>
>> Wouldn't this cause the binaries not to run with an older loader?
> 
> Maybe, but new dynamic table entries could do that, too.

I think ld.so ignores unknown DT_* entries.

> Does anyone remember what the experience was when PT_GNU_RELRO was added?

There were binutils crashes.

But I was mistaken: ld.so ignores unknown PT_* entries, too.

I still think a DT_* entry is conceptually the right choice here.  It's 
really specific to the PLT.  It's not something that I expect can be 
used to change other mappings successfully.

Thanks,
Florian

      reply	other threads:[~2018-07-04 13:34 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <87sh5hadd6.fsf@redhat.com>
     [not found] ` <CAMe9rOrFiHvUj4EeviT8UdA2b8b_FpiPofeNqRyWzNA9286ZNQ@mail.gmail.com>
2018-01-01  0:00   ` Nick Clifton
2018-01-01  0:00     ` Cary Coutant
2018-01-01  0:00       ` Cary Coutant
2018-01-01  0:00       ` Florian Weimer
2018-01-01  0:00         ` Cary Coutant
2018-01-01  0:00           ` Florian Weimer
2018-01-01  0:00             ` Cary Coutant
2018-01-01  0:00               ` Florian Weimer
2018-01-01  0:00                 ` Cary Coutant
2018-01-01  0:00                   ` Florian Weimer [this message]

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