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Allow for ELF files without program headers e.g. unlinked object files.

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This commit is contained in:
Mario Hüttel 2023-01-20 19:39:54 +01:00
parent 7e414f8576
commit faeab33375
1 changed files with 9 additions and 1 deletions
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10
src/elfpatch.c
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@ -290,6 +290,12 @@ static int elf_patch_read_program_headers(elfpatch_handle_t *ep)
return -1; return -1;
} }
if (header_count == 0) {
/* No program headers found. This ELF file is probably not linked */
ep->program_headers_count = 0;
return 0;
}
ep->program_headers = (GElf_Phdr *)malloc(header_count * sizeof(GElf_Phdr)); ep->program_headers = (GElf_Phdr *)malloc(header_count * sizeof(GElf_Phdr));
if (!ep->program_headers) { if (!ep->program_headers) {
/* Mem error. Abort. Program will crash eventually */ /* Mem error. Abort. Program will crash eventually */
@ -335,9 +341,11 @@ static void resolve_section_lmas(elfpatch_handle_t *ep)
if (!sec) if (!sec)
continue; continue;
/* By default each sections LMA is assumed to be its LMA as well */
sec->lma = (uint64_t)sec->section_header.sh_addr;
if (sec->section_header.sh_type == SHT_NOBITS) { if (sec->section_header.sh_type == SHT_NOBITS) {
/* Section does not contain data. It may be allocated but is not loaded. Therefore, LMA=VMA. */ /* Section does not contain data. It may be allocated but is not loaded. Therefore, LMA=VMA. */
sec->lma = (uint64_t)sec->section_header.sh_addr;
continue; continue;
} }