linux-kernel - Re: [FYI] tux3: Core changes

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Date:	Wed, 27 May 2015 11:09:25 -0700
From:	Daniel Phillips <daniel@...nq.net>
To:	Pavel Machek <pavel@....cz>
Cc:	Rik van Riel <riel@...hat.com>, <linux-kernel@...r.kernel.org>,
	<linux-fsdevel@...r.kernel.org>, <tux3@...3.org>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	<mgorman@...e.de>, Andrea Arcangeli <aarcange@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [FYI] tux3: Core changes

On Wednesday, May 27, 2015 12:41:37 AM PDT, Pavel Machek wrote:
> On Fri 2015-05-15 02:38:33, Daniel Phillips wrote:
>> On 05/14/2015 08:06 PM, Rik van Riel wrote: ...
>
> Umm. Why do you think it is only issue for executable files?

I meant: files with code in them, that will be executed. Please excuse
me for colliding with the chmod sense. I will say "code files" to avoid
ambiguity.

> I'm free to mmap() any file, and then execute from it.
>
> /lib/ld-linux.so /path/to/binary
>
> is known way to exec programs that do not have x bit set.

So... why would I write to a code file at the same time as stepping
through it with ptrace? Should I expect ptrace to work perfectly if
I do that? What would "work perfectly" mean, if the code is changing
at the same time as being traced?

Regards,

Daniel
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