includes/woody.h

@@ -14,9 +14,7 @@
 #include <elf.h>
 #include <stdint.h>
 
-
 #define JUMP "\xe9"
-#define WOODY "..WOODY.."
 #define TEXT_OFFSET "\xba\xba\xba\xba\xba\xba\xba\xba"
 #define SECTION_SIZE "\xca\xca\xca\xca\xca\xca\xca\xca"
 

print.s

@@ -9,29 +9,15 @@ _start:
 
 		mov rdi, 1
 		lea     rsi, [rel msg]
-		mov rax, rsi
+		mov rdx, 14
-		sub rax, qword [rel text_section] ;text_section address
-		mov r8, qword [rel section_sisze] ;text_section size
-		mov r9, 0 ;increment register
-		xor r10, r10
-	; encrypt:
-	; 	cmp r8, r9
-	; 	je end_encrypt
-	; 	mov r10b, byte[rax + r9]
-	; 	inc r10b ;rot + 1
-	; 	mov byte[rax + r9], r10b
-	; 	inc r9
-	; 	jmp encrypt
-	; end_encrypt:
-		mov rdx, 10
 		mov rax, 1
 		syscall
 	    pop rdx
         pop rsi
         pop rdi
         pop rax
+        jmp 0x00000000
 
-        jmp 0x00000000 ;for now it needs to be the first jmp
+		msg     db "....WOODY....",10
-		msg     db "..WOODY..",10
 		text_section      dq 0xbabababababababa
 		section_sisze     dq 0xcacacacacacacaca

srcs/encrypt.c

@@ -5,7 +5,7 @@ void	encrypt(char *file, unsigned long int offset, unsigned long int size)
 	size_t i = 0;
 	while (i < size)
 	{
-		file[offset + i] = file[offset + i] - 1;
+		file[offset + i] = file[offset + i] + 1;
 		++i;
 	}
 }

srcs/woody.c

@@ -100,31 +100,29 @@ t_payload *get_payload()
 int	insert_payload(t_elf_content *woody, t_payload *payload, size_t payload_position)
 {
 	char *ptr_jmp = ft_strnstr_nullterminated(payload->payload, JUMP, payload->len);
-	char *ptr_woody = ft_strnstr_nullterminated(payload->payload, WOODY, payload->len);
 	char *ptr_text_section = ft_strnstr_nullterminated(payload->payload, TEXT_OFFSET, payload->len);
 	char *ptr_section_size = ft_strnstr_nullterminated(payload->payload, SECTION_SIZE, payload->len);
-	if (ptr_jmp && ptr_woody && ptr_text_section && ptr_section_size)
+	if (ptr_jmp && ptr_text_section && ptr_section_size)
 	{
-		int32_t woody_index = ptr_woody - payload->payload;
+		printf("test a jumo = %ld\n", ptr_jmp - payload->payload);
+		printf("test a jumo = %ld\n", ptr_jmp - payload->payload + sizeof(JUMP));
+		printf("jump base = %ld\n", payload->len);
+		printf("the jump = %ld\n", payload->len - 16);
 
 		int32_t jmp_index = ptr_jmp - payload->payload;
 		int32_t jump_value = ((payload_position + jmp_index + 5) - woody->Ehdr->e_entry) * -1; // 5 = JUMP SIZE (OPCODE + 4 bytes operand)
 		ft_memcpy(&payload->payload[jmp_index + 1], &jump_value, sizeof(jump_value));
 
 		int64_t text_index = ptr_text_section - payload->payload;
-		int64_t text_value = payload_position - woody->Ehdr->e_entry + woody_index;
+		int64_t text_value = (payload_position - woody->text_section->sh_offset + text_index - 1) * -1;
+		text_value = 0;
 		ft_memcpy(&payload->payload[text_index], &text_value, sizeof(text_value));
 
 		int64_t section_index = ptr_section_size - payload->payload;
-		int64_t section_value = woody->text_section->sh_size;
+		int64_t section_value = (payload_position - woody->text_section->sh_size + section_index - 1) * -1;
 		ft_memcpy(&payload->payload[section_index], &section_value, sizeof(section_value));
 
 		ft_memcpy(woody->file + payload_position, payload->payload, payload->len);
-		
-		printf("jmp_index : %d (%x)\n", jmp_index, jmp_index);
-		printf("woody index :%d (%x)\n", woody_index, woody_index);
-		printf("jmp_index++ : %ld (%lx)\n", jmp_index + sizeof(JUMP) + sizeof(jump_value), jmp_index + sizeof(JUMP) + sizeof(jump_value) - 1);
-		printf("text_value : %ld (%lx)\n", text_value, text_value);
 		printf("Old entry : %ld (%lx)\n", woody->Ehdr->e_entry, woody->Ehdr->e_entry);
 		printf("Code cave start = %ld (%lx)\n", payload_position, payload_position);
 		printf("Payload size = %ld (%lx)\n", payload->len, payload->len);