diff options
| author | toni <toni@devlap.local> | 2015-10-27 10:45:36 +0100 |
|---|---|---|
| committer | toni <toni@devlap.local> | 2015-10-27 10:45:36 +0100 |
| commit | 5776888c1bf385138f8e87dd62688018ddca4f57 (patch) | |
| tree | 39e96e5aba46801c5c078c3c4b860bc306912886 | |
| parent | 0dcafee7a035b72d0dacfe270e5937ec98b860e7 (diff) | |
function jumping tests
| -rw-r--r-- | .gitignore | 1 | ||||
| -rw-r--r-- | Makefile | 2 | ||||
| -rw-r--r-- | funcjmp_ext.c | 40 | ||||
| -rw-r--r-- | funcjmp_simple.c | 1 |
4 files changed, 17 insertions, 27 deletions
@@ -8,3 +8,4 @@ sc-test sc-test_x64 funcjmp_simple funcjmp_ext +format @@ -5,7 +5,7 @@ CC := gcc STRIP := strip LBITS := $(shell getconf LONG_BIT) CFLAGS += -Wall -OCFLAGS += -z execstack -fno-stack-protector +OCFLAGS += -zexecstack -znorelro -fno-stack-protector -fno-pie -ggdb -static X86_FLAGS = -m32 -mpreferred-stack-boundary=2 X64_FLAGS = -m64 -mpreferred-stack-boundary=4 SOURCES = $(wildcard *.c) diff --git a/funcjmp_ext.c b/funcjmp_ext.c index 6174bec..9bf20f4 100644 --- a/funcjmp_ext.c +++ b/funcjmp_ext.c @@ -5,48 +5,36 @@ #define INTEL_ASM(_asm_str) asm volatile(".intel_syntax noprefix"); \ asm volatile(_asm_str); \ asm volatile(".att_syntax prefix"); -#define JUMPABLE_FUNC(fname) __attribute__ ((__cdecl__)) int fname(void) -#define JMP_FUNC_DECL(func) void *fptr = (void *)( &func ); -#define JMP_TO_FUNC \ - INTEL_ASM(" \ - call getip; \ - jmp short donext; \ - cfunc: \ - mov eax,[fptr]; \ - add eax,0x0; \ - jmp eax; \ - ret; \ - getip: \ - nop; \ - jmp short cfunc; \ - donext: \ - "); - -#define PRE_JUMP(arg) - int hookable(char *arg0, int arg1, int arg2) { asm("label:"); - INTEL_ASM("nop; nop; nop; pop eax; pop eax"); + INTEL_ASM("nop; nop; nop"); + printf("hookable ..\n"); + asm("nop; nop; nop; pop %ebx; pop %eax; call *%eax; call *%ebx"); asm("jmp end"); return 0; } -int testfkt(void *param) +int testfkt(void) { printf("Subroutine ..\n"); + return 0; +} + +void testfkt2(void) +{ + printf("another Subroutine ..\n"); } int main(int argc, char **argv) { - asm("push %0" : : "m" (hookable)); - asm("push %0" : : "g" (hookable)); + printf("main(...)\n"); + asm("push %0" : : "g" (testfkt)); + asm("push %0" : : "g" (testfkt2)); asm("jmp label; \ end:"); - //hookable(NULL, 0x8, 0x9); - printf("Hello World!\n"); - testfkt(NULL); + printf("EOF!\n"); return 66; } diff --git a/funcjmp_simple.c b/funcjmp_simple.c index 9e756cf..63946c8 100644 --- a/funcjmp_simple.c +++ b/funcjmp_simple.c @@ -29,6 +29,7 @@ JUMPABLE_FUNC(testfkt) { int var0 = 0x1, var1 = 0x2, var2 = 0x3; var0 += var1 + var2; + printf("Subroutine: %d = %d + %d\n", var0, var1, var2); return 0; } |