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§-Death_Reaver-§

Joined: 03 Aug 2006
Posts: 10
Location: Italy

§-Death_Reaver-§ 07 Mar 2008, 14:46

Yesterday i tried to write a simple program in linux using some gl and glut function, but when i execute it, it shows the "Segmentation Error"

i used theese for assembling and linking:
fasm ./OGL.asm
ld -s -o GL ./OGL.o /lib/ld-linux.so.2

Can someone help me understand what's wrong?
(sorry for my english Smile

)

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§-Death_Reaver-§

[my site: deathreaver.altervista.org]
[UIC site: quequero.org]

07 Mar 2008, 14:46

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20430
Location: In your JS exploiting you and your system

revolution 07 Mar 2008, 15:23

Maybe here:

Code:

keyboard: ;(tasto,x,y)
 mov eax,dword [ebp+8]
       cmp al,'q'
        je _exit
    ret ;<--- do you need a ret 12?

And perhaps also for the disegna/ret function.

07 Mar 2008, 15:23

§-Death_Reaver-§

Joined: 03 Aug 2006
Posts: 10
Location: Italy

§-Death_Reaver-§ 07 Mar 2008, 16:11

@revolution: thanks, but the problem still remain Sad

I used IDA and i discovered that the segmentation error happen inside the first function call (glutInit). mmmmm

ps. Are the ld's parameters right?

07 Mar 2008, 16:11

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20430
Location: In your JS exploiting you and your system

revolution 07 Mar 2008, 16:59

You need to pass a proper command line string to glutInit.

The first few lines of glutInit show that it does not allow null parameters:

Code:

void glutInit(int *argcp, char **argv) {
  char *str, *geometry = NULL;
  int i;

  if (gState.display) {
    __glutWarning("glutInit being called a second time.");
    return;
  }
  /* Determine temporary program name. */
  str = strrchr(argv[0], '/');         <--- here cannot be null!
  if (str == NULL) {
    gState.programName = argv[0];
  } else {
    gState.programName = str + 1;
  }
...

07 Mar 2008, 16:59

§-Death_Reaver-§

Joined: 03 Aug 2006
Posts: 10
Location: Italy

§-Death_Reaver-§ 07 Mar 2008, 17:33

thanks!

2° problem: Is there some methods in linux to get the current command line quickly (like GetCommandLine in windows)?

07 Mar 2008, 17:33

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20430
Location: In your JS exploiting you and your system

revolution 07 Mar 2008, 17:39

The entry point to your program will have the command line passed to you from the loader. As for getting it after that I am not sure, so to make your task easier just save the values upon entry.

07 Mar 2008, 17:39

dap

Joined: 01 Dec 2007
Posts: 61
Location: Belgium

dap 07 Mar 2008, 20:37

§-Death_Reaver-§ wrote:

thanks!
2° problem: Is there some methods in linux to get the current command line quickly (like GetCommandLine in windows)?

You may simply get them on the stack, like in C. The first parameter of the entry-point function is the number of words in the the command-line, and the second is a pointer to an array of pointers to the words.

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07 Mar 2008, 20:37

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