Ken Thompson mentioned a self-reproducing program that products an
exact copy of its source code as output in his 1983 Turing paper, http://www.acm.org/classics/sep95/ . Can this be done in C? How can a
program at runtime know its compiling-time source code? 11  4060 
lovecreatesbea. ..@gmail.com <lo************ ***@gmail.comwr ote:
Ken Thompson mentioned a self-reproducing program that products an
exact copy of its source code as output in his 1983 Turing paper,
http://www.acm.org/classics/sep95/ . Can this be done in C? How can a
program at runtime know its compiling-time source code?
Sure.
#include <stdlib.h>
int main( void ) {
system( "links http://www.google.com" ); /* On DS9K, may open "link"
to the Underdark, beware */
return 0;
}
Surely you've posted here often enough to know that you'll get "STFW"
for an answer to this question? Certainly quines have been discussed
many times on this very newsgroup.
--
C. Benson Manica | I *should* know what I'm talking about - if I
cbmanica(at)gma il.com | don't, I need to know. Flames welcome.
On May 10, 11:23 am, "lovecreatesbea ...@gmail.com"
<lovecreatesbea ...@gmail.comwr ote:
Ken Thompson mentioned a self-reproducing program that products an
exact copy of its source code as output in his 1983 Turing paper,http://www.acm.org/classics/sep95/. Can this be done in C?
Gosh, I don't know. Maybe I should do a web search, or check the FAQ
or try to run the
strange looking code that shows up in people's signatures.
How can a
program at runtime know its compiling-time source code?
In general it can't, but most programs are not self-reproducing..
However, given that the runtime is a function of the source code,
maybe it
would be possible to choose the source code so that the runtime
prints out this source code. Maybe I should do a web search, or check
the FAQ or try to run the
strange looking code that shows up in people's signatures.
--
William Hughes
10 LIST
On 10 May, 16:23, "lovecreatesbea ...@gmail.com"
<lovecreatesbea ...@gmail.comwr ote:
Ken Thompson mentioned a self-reproducing program that products an
exact copy of its source code as output in his 1983 Turing paper,http://www.acm.org/classics/sep95/. Can this be done in C? How can a
program at runtime know its compiling-time source code?
http://www.nyx.net/~gthompso/quine.htm
"lovecreatesbea ...@gmail.com" <lo************ ***@gmail.comwr ites:
Ken Thompson mentioned a self-reproducing program that products an
exact copy of its source code as output in his 1983 Turing paper,
http://www.acm.org/classics/sep95/ . Can this be done in C? How can a
program at runtime know its compiling-time source code?
The comp.lang.c FAQ is at <http://www.c-faq.com/>. You've just asked
question 20.34.
--
Keith Thompson (The_Other_Keit h) ks***@mib.org <http://www.ghoti.net/~kst>
San Diego Supercomputer Center <* <http://users.sdsc.edu/~kst>
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"
On May 10, 11:23 am, "lovecreatesbea ...@gmail.com"
<lovecreatesbea ...@gmail.comwr ote:
Ken Thompson mentioned a self-reproducing program that products an
exact copy of its source code as output in his 1983 Turing paper,http://www.acm.org/classics/sep95/. Can this be done in C? How can a
program at runtime know its compiling-time source code?
Others have pointed you at various resources wrt writing C quines.
They have answered your basic question.
But, if that's all you got out of Ken T's paper, then you missed a
lot.
His paper wasn't so much about quines as stand-alone programs, but
with the potential security exposures that quines (when incorporated
into C compilers) could have. He pointed out that a compiler could
imbed a trap-door security breach into anything it compiles, and (if
the compiler was compiled with itself), that trap-door could be
hidden /in the program/ rather than in the source code.
The quine comes from the compiler compiling in the security breach
insertion code into the (2nd generation) compiler - a quine in object
code rather than a quine in source code.
--
Lew
Lew Pitcher <lp******@teksa vvy.comwrote:
But, if that's all you got out of Ken T's paper, then you missed a
lot.
His paper wasn't so much about quines as stand-alone programs, but
with the potential security exposures that quines (when incorporated
into C compilers) could have. He pointed out that a compiler could
imbed a trap-door security breach into anything it compiles, and (if
the compiler was compiled with itself), that trap-door could be
hidden /in the program/ rather than in the source code.
Mind you, that trap-door only works if you assume that the compiler will
only be used to compile itself. It doesn't work if you use it to compile
an unrelated compiler of another language, which is used to compile a
cross-compiler of a language using another paradigm, which is used to
compile - for a different CPU - an interpreter for yet another language,
which is used to interpret a re-cross-compiler of the original language.
Bonus points if any of the architectures involved is completely virtual;
more bonus points if any of the languages was designed specifically for
this purpose.
Richard
"Lew Pitcher" <lp******@teksa vvy.comha scritto nel messaggio
news:11******** **************@ u30g2000hsc.goo glegroups.com.. .
On May 10, 11:23 am, "lovecreatesbea ...@gmail.com"
<lovecreatesbea ...@gmail.comwr ote:
>Ken Thompson mentioned a self-reproducing program that products an
exact copy of its source code as output in his 1983 Turing
paper,http://www.acm.org/classics/sep95/. Can this be done in C? How can
a
program at runtime know its compiling-time source code?
Others have pointed you at various resources wrt writing C quines.
They have answered your basic question.
But, if that's all you got out of Ken T's paper, then you missed a
lot.
His paper wasn't so much about quines as stand-alone programs, but
with the potential security exposures that quines (when incorporated
into C compilers) could have. He pointed out that a compiler could
imbed a trap-door security breach into anything it compiles, and (if
the compiler was compiled with itself), that trap-door could be
hidden /in the program/ rather than in the source code.
The quine comes from the compiler compiling in the security breach
insertion code into the (2nd generation) compiler - a quine in object
code rather than a quine in source code.
Huh?
--
#include <stdlib.h>
int main(int argc, char *argv[])
{
return system(argv[0]);
}
Richard Bos wrote:
>
Mind you, that trap-door only works if you assume that the compiler will
only be used to compile itself.
Only??! It will work in more cases than that.
The seriousness here, is that system programs are typically written in
C, and C compilers are typically written in C.
If you develop a new C compiler, and use the infected compiler when
bootstrapping, the backdoor will be inherited. Also, if you create a C
cross compiler, the backdoor will be passed forward.
The payload, can even be targeted for multiple platforms.
--
Tor
lovecreatesbea. ..@gmail.com wrote:
Ken Thompson mentioned a self-reproducing program that products an
exact copy of its source code as output in his 1983 Turing paper,
http://www.acm.org/classics/sep95/ . Can this be done in C? How can a
program at runtime know its compiling-time source code?
This is a brilliant paper, read it carefully.I have given this puzzle to
student/junior programmers, multiple times.
If you really want to learn something, try hard to solve this puzzle in
C yourself. Seeing a solution, gives you little.
--
Tor <torust [at] online [dot] no> This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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******************************************************************************
This posting is also available in HTML format:
http://cci.lbl.gov/~rwgk/python/adopt_init_args_2005_07_02.html
******************************************************************************
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