Snippet to freeze 2.1.125

Ragnar Hojland Espinosa (ragnar@lightside.ddns.org)
Mon, 19 Oct 1998 09:31:16 +0100 (MET)

Could anyone please try to run this and tell me if it freezes their kernel
or not? Compile with gcc 2.7.2.3 and no optimizations

-- 
____/|  Ragnar Hojland  (ragnar@lightside.ddns.org)      Fingerprint  94C4B
\ o.O|                                                   2F0D27DE025BE2302C
 =(_)=  "Thou shalt not follow the NULL pointer for      104B78C56 B72F0822
   U     chaos and madness await thee at its end."       hkp://keys.pgp.com


#include <signal.h>


unsigned char the_data[] = {62, 152, 13, 32, 224, 235, 230, 126, 247 };
void handler (int sig)  { }


void (*badboy)();
int main (int argc, char **argv)
{
   badboy = (void(*)())(the_data);
   signal (SIGSEGV, handler);
//   asm ("call the_data");        // gcc generates this with -O0 (ok)
   asm ("movl badboy,%eax");       // and these two with -O1+ (frozen,
   asm ("call *%eax");             // if you use signal above)
	
   return 0;
}


/*
0x804952c <the_data>:   cwtl
0x804952e <the_data+2>: orl    $0xe6ebe020,%eax
0x8049533 <the_data+7>: jle    0x804952c <the_data>


0x8049535 <the_data+9>: addb   %al,(%eax)
0x8049537 <the_data+11>:        addb   %bh,%bh
*/




-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/