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Message-ID: <43ABC8B2.7020904@gmail.com>
Date: Fri, 23 Dec 2005 11:51:46 +0200
From: Alon Bar-Lev <alon.barlev@gmail.com>
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To: David Wagner <daw@cs.berkeley.edu>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [Question] LinuxThreads, setuid - Is there user mode hook?
References: <200512222312.jBMNCj96018554@taverner.CS.Berkeley.EDU>
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David Wagner wrote:
> In article <43AACA82.5050305@gmail.com> you write:
> 
>>I am writing a provider that uses pthreads. The main program 
>>does not aware that the provider is using threads and it is 
>>not multithreaded.
>>
>>After initialization the program setuid to nobody, the 
>>problem is that my threads remains in root id.
> 
> 
> Mixing threads and setuid programs seems like a really bad idea.
> This is especially true if you have to ask about it -- which means
> that you don't know enough to write such a program safely (please
> don't take offense).
> 

I know that!
And I am aware of the (Linux implementation) implications...

I don't think you read my question in deep...
I offer a provider (Shared library), and I must deal with 
this edge condition where the main program setuid.

In Linux every thread is a process so only the main thread 
is setuided.

I need to catch this even in my shared library and setuid my 
threads as well, since Linux pthreads implementation does 
not take care of this.

Since I am not writing the main program and since I cannot 
force the main programmer to behave any differently, I must 
handle this internally.

Do you know a way to be notified when the process setuid?

Best Regards,
Alon Bar-Lev.
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