Re: [PATCH] [SECURITY] suid procs exec'd with bad 0,1,2 fds

Perry Harrington (pedward@sun4.apsoft.com)
Tue, 4 Aug 1998 13:42:56 -0700 (PDT)

>
> From: Perry Harrington <pedward@sun4.apsoft.com>
> Date: Tue, 4 Aug 1998 13:32:08 -0700 (PDT)
>
> But what uses exec stacks, other than exploits?
>
> Interpreter implementations for certain languages. Compiled languages
> use the stack for trampoline code snippets. Linus mentioned this
> already.

The trampoline thing has already been discussed. The other use, interpreters,
is odd. You're telling me that people have written interpreters that place code
to actually execute on the stack? I've read a bit about stack machines, and
wrote one, the implementations I've seen would never do such a machine dependent
and unorthodox thing. Although you do have to worry about machine dependent things
such as alignment, but I could only forsee the stack being used to hold an exec list
of functions in native code to call.

>
> Later,
> David S. Miller
> davem@dm.cobaltmicro.com
> 

-- 
Perry Harrington       Linux rules all OSes.    APSoft      ()
email: perry@apsoft.com 			Think Blue. /\


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