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Re: Quick access to stack bounds

From: Roland McGrath <roland at redhat dot com>
To: Richard Henderson <rth at twiddle dot net>
Cc: Ulrich Drepper <drepper at redhat dot com>, libc-alpha at sourceware dot org
Date: Wed, 9 Dec 2009 10:58:22 -0800 (PST)
Subject: Re: Quick access to stack bounds
References: <20091206015047.GA27264@twiddle.net><4B1EF5D4.70600@redhat.com><4B1FDA8E.8030700@twiddle.net>

> The PROT_GROWS_DOWN implementation extends the vma?  I had thought the 
> reserved address space was fixed and the flag was merely a hint for how 
> to allocate pages within that vma.  That does add a wrinkle...

Nope.  There is no reservation of the space.  i.e., any another mapping
made down there means that the stack vma can no longer extend farther down,
but instead the sp will just run into that other mapping.

References:
- Quick access to stack bounds
  - From: Richard Henderson
- Re: Quick access to stack bounds
  - From: Ulrich Drepper
- Re: Quick access to stack bounds
  - From: Richard Henderson

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