linux-kernel - Re: [PATCH 0/1][BUG][IMPORTANT] KEYRINGS: find_keyring_by

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Date:	Fri, 23 Apr 2010 09:39:04 +0100
From:	David Howells <dhowells@...hat.com>
To:	Toshiyuki Okajima <toshi.okajima@...fujitsu.com>
Cc:	dhowells@...hat.com, keyrings@...ux-nfs.org, security@...nel.org,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/1][BUG][IMPORTANT] KEYRINGS: find_keyring_by_name() can gain the freed keyring

Toshiyuki Okajima <toshi.okajima@...fujitsu.com> wrote:

> #!/bin/sh
> 
> LOOP=100000
> USER=dummy_user
> # add
> /bin/su -c "exit;" $USER || { /usr/sbin/adduser -m $USER; add=1; }
> 
> for ((i=0; i<LOOP; i++))
> do
>         /bin/su -c "echo '$i' > /dev/null" $USER
> done
> 
> # del
> (( add == 1 )) && /usr/sbin/userdel -r $USER
> exit

Doing:

	for ((i=0; i<100000; i++)); do keyctl session wibble /bin/true || break; done

ought to work too.

David
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