blob: 3046fbecf2298f97ec6f38f882914325077bd81a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
#include <stdint.h>
#include <stdio.h>
__attribute__ (( noreturn, section ( ".text.null_trap" ) ))
void null_function_trap ( void ) {
void *stack;
/* 128 bytes of NOPs; the idea of this is that if something
* dereferences a NULL pointer and overwrites us, we at least
* have some chance of still getting to execute the printf()
* statement.
*/
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "nop ; nop ; nop ; nop" );
__asm__ __volatile__ ( "movl %%esp, %0" : "=r" ( stack ) );
printf ( "NULL method called from %p (stack %p)\n",
__builtin_return_address ( 0 ), stack );
DBG_HD ( stack, 256 );
while ( 1 ) {}
}
|
