From: Adam Litke <agl@us.ibm.com>
To: David Gibson <david@gibson.dropbear.id.au>
Cc: linuxppc-dev@ozlabs.org, libhugetlbfs-devel@lists.sourceforge.net
Subject: Re: [Libhugetlbfs-devel] libbugetlbfs: Test case for powerpc huge_ptep_set_wrprotect() bug
Date: Mon, 07 Jul 2008 10:27:00 -0500 [thread overview]
Message-ID: <1215444420.14825.70.camel@localhost.localdomain> (raw)
In-Reply-To: <20080707071955.GA27709@yookeroo.seuss>
On Mon, 2008-07-07 at 17:19 +1000, David Gibson wrote:
> Until very recently (in fact, even now in mainline) powerpc kernels
> had a bug in huge_ptep_set_wrprotect() which meant the 'huge' flag was
> not passed down to pte_update() and hpte_need_flush(). This meant the
> hash ptes for hugepages would not be correctly flushed on fork(),
> allowing the parent to pollute the child's mapping after the fork().
>
> This patch adds a testcase to libhugetlbfs for this behaviour, also
> doing some other checking of the COW semantics over a fork().
>
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Good test David, thanks...
Acked-by: Adam Litke <agl@us.ibm.com>
--
Adam Litke - (agl at us.ibm.com)
IBM Linux Technology Center
next prev parent reply other threads:[~2008-07-07 15:26 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-07 7:19 libbugetlbfs: Test case for powerpc huge_ptep_set_wrprotect() bug David Gibson
2008-07-07 15:27 ` Adam Litke [this message]
2008-07-07 18:48 ` [Libhugetlbfs-devel] " Nishanth Aravamudan
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