RE: [PATCH] Handle non-readable binfmt misc executables

[Zach, Yoav]

>-----Original Message-----
>From: Albert Cahalan [mailto:albert@xxxxxxxxxxxxxxxxxxxxx] 
>Sent: Sunday, June 20, 2004 15:17
>To: Zach, Yoav
>Cc: linux-kernel mailing list
>Subject: RE: [PATCH] Handle non-readable binfmt misc executables
>


>So the content of /proc/*/cmdline is correct?
>

After the translator fixes it - yes.

>At a minimum, you will have a problem at startup.
>The process might be observed before you fix argv.
>

Right. It might happen once in a (long) while that
'ps -f' doesn't show the correct command line. 

>What about apps that walk off the end of argv to get
>at the environment?
>

Please note that the stack is that of the translator, which
is aware of the fixing of argv.

>It seems cleaner to use some other mechanism.
>Assuming your interpreter is ELF, ELF notes are good.

Using ELF notes means changing the binaries, which is not
suitable for cases where the use of translator for running
the binaries is not 'known' to the binaries. For example,
an administrator might start using a translator to enhance
performance of existing binaries. In such a case, re-building
the binaries will probably be out of the question.

>You might use prctl().
>

Do you mean enhancing sys_prctl to allow for fixing 
the argv ? 

Thanks,
Yoav.
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