Re: [PATCH] FDPIC: Ignore the loader's PT_GNU_STACK when calculating the stack size

[Mike Frysinger]

On Fri, Jul 3, 2009 at 23:34, Pavel Machek wrote:
> On Wed 2009-07-08 12:01:40, David Howells wrote:
>> Pavel Machek <pavel@xxxxxx> wrote:
>>
>> > The patch seems wrong to me; loader needs the stack, too, right?
>> >
>> > What about making sure that the loader specifies reasonable stack
>> > size, instead?
>>
>> The loader doesn't need its own stack, unless it _is_ the executable. ÂIt uses
>> the executable's stack. ÂThe problem is that the executable and the loader can
>> both specify the stack size for NOMMU, but which one do we pick, or do we
>> consider both.
>
> Imageine loader needs 64K, while executable only needs 4K. You surely
> want to execute it with 64K stack, because it will not fit into 4K?

i really dont think this is realistic.  there is exactly one ldso that
everyone uses under FDPIC ELF, and it needs a very minuscule stack.
-mike
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