linux-kernel - Re: [PATCH 2/2] Yama: add PTRACE exception tracking

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Message-ID: <AANLkTim_RShqD7CKwjyeeGf3-1NZaVE4K2XUlrsoS1xx@mail.gmail.com>
Date:	Wed, 30 Jun 2010 11:41:26 -0400
From:	Eric Paris <eparis@...isplace.org>
To:	Kees Cook <kees.cook@...onical.com>
Cc:	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] Yama: add PTRACE exception tracking

On Tue, Jun 29, 2010 at 8:40 PM, Kees Cook <kees.cook@...onical.com> wrote:
> Some application suites have external crash handlers that depend on
> being able to use PTRACE to generate crash reports (KDE, Chromium, etc).
> Since the inferior process generally knows the PID of the debugger,
> it can use PR_SET_PTRACER to allow a specific PID and its descendants
> to perform the PTRACE instead of only a direct ancestor.
>
> Signed-off-by: Kees Cook <kees.cook@...onical.com>

any normal unpriv application:

while(1) {
        prctl(PR_SET_PTRACER, 1, 0, 0, 0);
}

watch kernel run out of memory and bring down the box.  Seems like
quite the DoS.....

-Eric
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