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Message-ID: <20130331213759.GJ30576@port70.net>
Date: Sun, 31 Mar 2013 23:37:59 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: pthread_getattr_np
* Rich Felker <dalias@...ifal.cx> [2013-03-31 17:00:05 -0400]:
> > to get a 'precize' lowend one can:
> > 1) parse /proc/self/maps which gives the current [low,high] mapping
> > and 'prev' the high end of the last mapping below the stack
> > 2) if we are the main thread check if low <= sp <= high
> > 3) check rlimit
>
> Parsing /proc/self/maps is utterly useless for non-main-thread. Unless
> the thread has a guard page, its stack mapping can be adjacent to
> another thread's stack mapping, and thus they can get merged into a
> single mapping.
i was only talking about the main thread case,
because you said the other case is simple
what i meant in 2) is if another thread tries
to query the stack of the main thread
the /proc/self/maps works for that too, but
then you cannot check if sp is really in the
given intervall
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