80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
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#include "../includes/woody.h"
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int get_load_segment32(t_elf_content *woody, int start, bool executable)
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{
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t_elf32 *elf = woody->elf32;
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for (int i = start; i < elf->Ehdr->e_phnum; i++)
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{
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if (elf->Phdr[i].p_type == PT_LOAD)
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{
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if (executable)
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{
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if (elf->Phdr[i].p_flags & PF_X)
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return i;
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}
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else
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return i;
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}
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}
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return -1;
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}
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int inject32(t_elf_content *woody)
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{
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t_elf32 *elf = woody->elf32;
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t_payload *payload = get_payload();
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if (!payload)
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return EXIT_FAILURE;
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int i = get_load_segment32(woody, 0, true);
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int j = get_load_segment32(woody, i + 1, false);
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if (i == -1 || j != i + 1)
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{
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free(payload->payload);
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free(payload);
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return ft_put_error("PT_LOAD segment missing");
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}
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size_t code_cave_size = elf->Phdr[j].p_offset - (elf->Phdr[i].p_offset + elf->Phdr[i].p_filesz);
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size_t payload_position = elf->Phdr[i].p_offset + elf->Phdr[i].p_filesz;
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if (code_cave_size < (size_t)payload->len)
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{
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free(payload->payload);
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free(payload);
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return ft_put_error("Unable to insert payload, not enough space for code cave");
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}
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elf->Phdr[i].p_filesz += payload->len;
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elf->Phdr[i].p_memsz += payload->len;
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if (insert_payload(woody, payload, payload_position, elf->Ehdr->e_entry, elf->Phdr[i].p_offset, elf->Phdr[i].p_memsz))
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{
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free(payload->payload);
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free(payload);
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return ft_put_error("Unable to insert payload, please regenerate it");
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}
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elf->Ehdr->e_entry = payload_position;
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elf->Phdr[i].p_flags = PF_X | PF_W | PF_R;
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free(payload->payload);
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free(payload);
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return EXIT_SUCCESS;
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}
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int get_elf_sections32(t_elf_content *woody)
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{
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woody->elf32->Ehdr = (Elf32_Ehdr *)fetch(woody->file, woody->file_size, 0, sizeof(Elf32_Ehdr));
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if (!woody->elf32->Ehdr)
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return EXIT_FAILURE;
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woody->elf32->Phdr = (Elf32_Phdr *)fetch(woody->file, woody->file_size, woody->elf32->Ehdr->e_phoff, sizeof(Elf32_Phdr));
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if (!woody->elf32->Phdr)
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return EXIT_FAILURE;
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woody->elf32->Shdr = (Elf32_Shdr *)fetch(woody->file, woody->file_size, woody->elf32->Ehdr->e_shoff, sizeof(Elf32_Shdr));
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if (!woody->elf32->Shdr || !fetch(woody->file, woody->file_size, woody->elf32->Ehdr->e_shoff, woody->elf32->Ehdr->e_shnum * sizeof(Elf32_Shdr)))
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return EXIT_FAILURE;
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return EXIT_SUCCESS;
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}
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