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Re: Removal of unexec support from glibc malloc


On 01/18/2016 11:27 PM, Joseph Myers wrote:
> On Mon, 18 Jan 2016, Daniel Colascione wrote:
> 
>> On 01/18/2016 11:54 AM, Zack Weinberg wrote:
>>> On Mon, Jan 18, 2016 at 2:47 PM, Daniel Colascione <dancol@dancol.org> wrote:
>>>>
>>>> As long as the ABI support is there, we can keep using the "separate
>>>> malloc implementation" even if glibc doesn't cooperate by providing
>>>> convenient headers to access it.
>>>
>>> Clarification: it will not be possible to link new executables against
>>> the symbols in question. (This is what a "compat symbol" in glibc is -
>>> available only to existing binaries, not to new invocations of ld.)
>>
>> Oh, with a linker script or other hackery, I'm sure I could make it
>> available to new invocations of ld. It's just bytes.
> 
> Being a compat symbol also means that future architecture ports and ABIs 
> don't include the functionality at all.

And even if the symbol is still there, the the version you need to
supply will be architecture-specific.  Don't do this. :)

Florian


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