Bastian Blank <[email protected]> writes:
> On Thu, Oct 12, 2006 at 04:02:24PM +0200, Bastian Blank wrote:
>> The commit 778c1144771f0064b6f51bee865cceb0d996f2f9 replaced the old
>> root-based security checks in procfs with processed based ones.
>
> The new behaviour even allows a user to escape from the chroot by using
> chdir to /proc/$pid/cwd or /proc/$pid/root of a process he owns and
> lives outside of the chroot.
Yep. It makes it obvious that you can do that.
If you were in a chroot you could always ptrace a process you own
that was outside of the chroot, and cause it to do things, such as
open a unix domain socket and pass you it's current root directory.
chroot by itself has never been much of a jail.
Eric
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