From: Andrea Arcangeli <andrea@e-mind.com>
To: Neil Booth <NeilB@earthling.net>
Cc: linux-mm@kvack.org
Subject: Re: PATCH - bug in vfree
Date: Thu, 25 Feb 1999 01:47:58 +0100 (CET) [thread overview]
Message-ID: <Pine.LNX.4.05.9902250142030.218-100000@laser.random> (raw)
In-Reply-To: <36CEA095.D5EA37B5@earthling.net>
On Sat, 20 Feb 1999, Neil Booth wrote:
>I posted this bug on the kernel mailing list last year, but it never got
>fixed, probably as I didn't include a patch. I attach a patch this time
I included it one year ago in my tree and infact if you grab my
arca-patches you'll find it again ;).
>against kernel 2.2.1. The bug is rare, but can lead to kernel virtual
>memory corruption.
Hmm, when I checked it one year ago I didn't seen a way the bug could
corrupt memory.
>More deeply:- Close inspection of get_vm_area reveals that
>(intentionally?) it does NOT insist there be a cushion page behind a VMA
>that is placed in front of a previously-allocated VMA, it ONLY
Could you explain me better? I agree that there's no good reason trying to
free the gap-faulting page, but I don't see how there couldn't be a
page-gap between two vmalloced areas.
Andrea Arcangeli
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prev parent reply other threads:[~1999-02-25 1:01 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-02-20 11:46 PATCH - bug in vfree Neil Booth
1999-02-20 12:14 ` Neil Booth
1999-02-27 2:39 ` Neil Booth
1999-02-22 20:31 ` Kanoj Sarcar
1999-02-25 0:47 ` Andrea Arcangeli [this message]
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