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woody-woodpacker
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fix: "clean" jump, can modify payload

This commit is contained in:
gbrochar 2024-04-17 06:53:47 +02:00
parent 621a1ec641
commit c04078e5a2
1 changed files with 1 additions and 3 deletions
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4
srcs/woody.c
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@ -1,6 +1,5 @@
#include "../includes/woody.h"
int elf_magic_numbers(char *str)
{
return (!ft_strncmp(str, ELFMAG, SELFMAG));
@ -99,8 +98,7 @@ int insert_payload(t_elf_content *woody, t_payload *payload, size_t payload_posi
if (ptr)
{
int32_t jmp_index = ptr - payload->payload;
int32_t jump_value = ((payload_position + payload->len) - woody->Ehdr->e_entry) * -1;
jump_value += 14;
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));
ft_memcpy(woody->file + payload_position, payload->payload, payload->len);