linux-kernel - Re: [PATCH] uprobes: mmap_region() corrupts mm->mm_rb if uprobe

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Message-ID: <20120731132542.GA2854@redhat.com>
Date:	Tue, 31 Jul 2012 15:25:42 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Anton Arapov <anton@...hat.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	William Cohen <wcohen@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] uprobes: mmap_region() corrupts mm->mm_rb if
	uprobe_mmap() fails

On 07/31, Oleg Nesterov wrote:
>
> OK, so what you suggest for now?
>
> Please note that it is very trivial to crash the kernel. Just
> do something like
>
> 	echo "p /bin/true:OFFSET_OF_SYSCALL_INSN" > /sys/kernel/debug/tracing/uprobe_events
> 	/bin/true

Forgot to mention...

And even it it didn't crash, mmap() (and thus exec) should not fail.

Oleg.

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