From: Pavel Machek <pavel@ucw.cz>
To: David Howells <dhowells@redhat.com>
Cc: vapier.adi@gmail.com, rgetz@blackfin.uclinux.org,
lethal@linux-sh.org, gerg@uclinux.org,
uclinux-dist-devel@blackfin.uclinux.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] FDPIC: Ignore the loader's PT_GNU_STACK when calculating the stack size
Date: Sat, 4 Jul 2009 04:46:07 +0200 [thread overview]
Message-ID: <20090704024606.GE1345@ucw.cz> (raw)
In-Reply-To: <20090701120814.30741.10146.stgit@warthog.procyon.org.uk>
On Wed 2009-07-01 13:08:14, David Howells wrote:
> Ignore the loader's PT_GNU_STACK when calculating the stack size, and only
> consider the executable's PT_GNU_STACK, assuming the executable has one.
>
> Currently the behaviour is to take the largest stack size and use that, but
> that means you can't reduce the stack size in the executable. The loader's
> stack size should probably only be used when executing the loader directly.
>
> WARNING: This patch is slightly dangerous - it may render a system inoperable
> if the loader's stack size is larger than that of important executables, and
> the system relies unknowingly on this increasing the size of the stack.
The patch seems wrong to me; loader needs the stack, too, right?
What about making sure that the loader specifies reasonable stack
size, instead?
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2009-07-08 10:36 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-01 12:08 David Howells
2009-07-01 16:02 ` Mike Frysinger
2009-07-01 16:48 ` [PATCH] FDPIC: Ignore the loader's PT_GNU_STACK when calculating the stack size [ver #2] David Howells
2009-07-01 16:49 ` [PATCH] FDPIC: Ignore the loader's PT_GNU_STACK when calculating the stack size David Howells
2009-07-01 16:49 ` [PATCH] FDPIC: Ignore the loader's PT_GNU_STACK when calculating the stack size [ver #2] David Howells
2009-07-02 17:21 ` [PATCH] FDPIC: Ignore the loader's PT_GNU_STACK when calculating the stack size Paul Mundt
2009-07-04 2:46 ` Pavel Machek [this message]
2009-07-08 11:01 ` David Howells
2009-07-04 3:34 ` Pavel Machek
2009-07-08 18:48 ` Mike Frysinger
2009-07-09 10:19 ` Pavel Machek
2009-07-09 10:59 ` David Howells
2009-07-11 21:30 ` Pavel Machek
2009-07-14 12:15 ` Mike Frysinger
2009-07-18 10:39 ` Pavel Machek
2009-07-18 19:11 ` Mike Frysinger
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