44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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#include <elf.h>
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#if CRIMES_ELF_BITS == 32
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#define Elf_Ehdr Elf32_Ehdr
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#define Elf_Phdr Elf32_Phdr
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#define CRIMES_PATCH_FUNC crimes_32
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#else
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#define Elf_Ehdr Elf64_Ehdr
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#define Elf_Phdr Elf64_Phdr
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#define CRIMES_PATCH_FUNC crimes_64
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#endif
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#define crimes_str(x) #x
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void CRIMES_PATCH_FUNC(Elf_Ehdr* elf) {
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uint8_t* phdrs = ((uint8_t*) elf) + elf->e_phoff;
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ssize_t src = -1;
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ssize_t dst = -1;
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for (size_t i = 0; i < elf->e_phnum; i++) {
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Elf_Phdr* phdr = (Elf_Phdr*) (phdrs + elf->e_phentsize * i);
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if (phdr->p_type == PT_INTERP) {
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src = i + 1;
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dst = i;
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}
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}
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if (src < 0) {
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printf("[%s] couldn't find PT_INTERP - skipping\n", crimes_str(CRIMES_PATCH_FUNC));
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return;
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}
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memmove(phdrs + dst * elf->e_phentsize, phdrs + src * elf->e_phentsize,
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(elf->e_phnum - dst) * elf->e_phentsize);
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elf->e_phnum -= 1;
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printf("[%s] patch complete\n", crimes_str(CRIMES_PATCH_FUNC));
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}
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#undef Elf_Ehdr
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#undef Elf_Phdr
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#undef CRIMES_PATCH_FUNC
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