Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Wed, 17 Oct 2012 03:03:39 +0200
From: boris brezillon <>
Subject: Re: TLS (thread-local storage) support

2012/10/17 Rich Felker <>:
> On Wed, Oct 17, 2012 at 02:08:11AM +0200, boris brezillon wrote:
>> >> I agree. This should be made optional. But if we don't compile libc
>> >> with fsplit-stack (-fnosplit-stack).
>> >> Each call to a libc func from an external func compiled with split
>> >> stack may lead to a 64K stack chunk alloc.
>> >
>> > Where does this allocation take place from? There should simply be a
>> > way to inhibit it.
>> In the linker (gold linker).
> Well gold isn't running at runtime. I assume you mean it _arranges_
> for this allocation to take place somehow, and that's what I'm
> wondering about whether there's a way to avoid.
this is done in __morestack_non_split (libgcc/config/i386/morestack.S).
the linker replaces the __morestack call in the no_split_stack
function's caller by __morestack_non_split.

> Rich

Powered by blists - more mailing lists

Your e-mail address:

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.