From: Daniel Jacobowitz <dan@debian.org>
To: Andrew Morton <akpm@osdl.org>
Cc: Stephen Hemminger <shemminger@osdl.org>,
linux-kernel@vger.kernel.org, Pavel Machek <pavel@ucw.cz>
Subject: Re: 2.6.11-rc3: Kylix application no longer works?
Date: Wed, 9 Feb 2005 10:34:41 -0500 [thread overview]
Message-ID: <20050209153441.GA8809@nevyn.them.org> (raw)
In-Reply-To: <20050208181018.5592beab.akpm@osdl.org>
On Tue, Feb 08, 2005 at 06:10:18PM -0800, Andrew Morton wrote:
> We could just remove the printk and stick a comment over it. If the
> application later tries to access the not-there pages then it'll just
> fault.
>
> However I worry if there is some way in which we can leave unzeroed memory
> accessible to the application, although it's hard to see how that could
> happen.
>
> Daniel, Pavel cruelly chopped you off the Cc when replying. What's your
> diagnosis on the below?
It's asking for a lot of unwritable zeroed space. See this:
> LOAD 0x000000 0x08048000 0x08048000 0xb7354 0x1b7354 R E 0x1000
> LOAD 0x0b7354 0x08200354 0x08200354 0x1e3e4 0x1f648 RW 0x1000
The 0xb7354 is size to map from the file, the 0x1b7354 is size to map
in memory. We're supposed to zero-fill the rest. Now that I think
about it I can see why this is a problem - the kernel probably assumes
that any segment with MemSiz > FileSiz will be writable. Certainly
it's a bit weird for the app to request unwritable zeroed pages.
clear_user's probably not the right way to provide the extra zeroing.
--
Daniel Jacobowitz
CodeSourcery, LLC
next prev parent reply other threads:[~2005-02-09 15:34 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-07 22:11 2.6.11-rc3: Kylix application no longer works? Pavel Machek
2005-02-07 22:51 ` Andrew Morton
2005-02-08 0:03 ` Daniel Drake
2005-02-08 0:18 ` Andrew Morton
2005-02-08 0:56 ` Grzegorz Kulewski
2005-02-08 4:06 ` Andrew Morton
2005-02-08 17:13 ` Pavel Machek
2005-02-08 8:15 ` Daniel Drake
2005-02-08 17:27 ` Pavel Machek
2005-02-08 17:51 ` Pavel Machek
2005-02-08 19:16 ` Stephen Hemminger
2005-02-09 2:10 ` Andrew Morton
2005-02-09 11:11 ` Pavel Machek
2005-02-09 15:34 ` Daniel Jacobowitz [this message]
2005-02-09 20:13 ` Rik van Riel
2005-02-12 0:39 ` Ingo Oeser
2005-02-08 20:43 ` Daniel Jacobowitz
2005-02-08 22:27 ` Pavel Machek
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