Re: Chroot bug

[Jan Engelhardt <jengelh@computergmbh.de>]

On Sep 26 2007 01:11, David Newall wrote:
> Jan Engelhardt wrote:
>> On Sep 26 2007 00:40, David Newall wrote:
>>   
>> > Miloslav Semler pointed out that a root process can chdir("..") out of its
>> > chroot.
>> So what? Just do this: chdir into the root after chroot.
>
> I don't think so.  His exploit just got me all the way out of a chroot within a
> chroot within a chroot, inclusive of lots of chdirs.

Close all fds that point to directories outside the root ;-)

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/