Re: [Question] LinuxThreads, setuid - Is there user mode hook?

[Lee Revell]

On Fri, 2005-12-23 at 11:51 +0200, Alon Bar-Lev wrote:
> David Wagner wrote:
> > In article <43AACA82.5050305@xxxxxxxxx> 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?

Why on earth would you use LinuxThreads rather than NPTL?  LinuxThreads
is obsolete and was never remotely POSIX compliant.

Lee

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