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elf2nso/elf2nro: Parse Build ID into header.

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This commit is contained in:
Michael Scire 2018-07-29 12:04:23 -07:00
parent 422537612f
commit 428a51c3b7
3 changed files with 39 additions and 0 deletions
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19
src/elf2nro.c
View File

@ -185,6 +185,25 @@ int main(int argc, char* argv[]) {
file_off = (file_off + 0xFFF) & ~0xFFF;
}
/* Iterate over sections to find build id. */
size_t cur_sect_hdr_ofs = hdr->e_shoff;
for (unsigned int i = 0; i < hdr->e_shnum; i++) {
Elf64_Shdr *cur_shdr = (Elf64_Shdr *)(elf + cur_sect_hdr_ofs);
if (cur_shdr->sh_type == SHT_NOTE) {
Elf64_Nhdr *note_hdr = (Elf64_Nhdr *)(elf + cur_shdr->sh_offset);
u8 *note_name = (u8 *)((uintptr_t)note_hdr + sizeof(Elf64_Nhdr));
u8 *note_desc = note_name + note_hdr->n_namesz;
if (note_hdr->n_type == NT_GNU_BUILD_ID && note_hdr->n_namesz == 4 && memcmp(note_name, "GNU\x00", 4) == 0) {
size_t build_id_size = note_hdr->n_descsz;
if (build_id_size > 0x20) {
build_id_size = 0x20;
}
memcpy(nro_hdr.BuildId, note_desc, build_id_size);
}
}
cur_sect_hdr_ofs += hdr->e_shentsize;
}
FILE* out = fopen(argv[2], "wb");
if (out == NULL) {

19
src/elf2nso.c
View File

@ -158,6 +158,25 @@ int main(int argc, char* argv[]) {
file_off += comp_sz[i];
}
/* Iterate over sections to find build id. */
size_t cur_sect_hdr_ofs = hdr->e_shoff;
for (unsigned int i = 0; i < hdr->e_shnum; i++) {
Elf64_Shdr *cur_shdr = (Elf64_Shdr *)(elf + cur_sect_hdr_ofs);
if (cur_shdr->sh_type == SHT_NOTE) {
Elf64_Nhdr *note_hdr = (Elf64_Nhdr *)(elf + cur_shdr->sh_offset);
u8 *note_name = (u8 *)((uintptr_t)note_hdr + sizeof(Elf64_Nhdr));
u8 *note_desc = note_name + note_hdr->n_namesz;
if (note_hdr->n_type == NT_GNU_BUILD_ID && note_hdr->n_namesz == 4 && memcmp(note_name, "GNU\x00", 4) == 0) {
size_t build_id_size = note_hdr->n_descsz;
if (build_id_size > 0x20) {
build_id_size = 0x20;
}
memcpy(nso_hdr.BuildId, note_desc, build_id_size);
}
}
cur_sect_hdr_ofs += hdr->e_shentsize;
}
FILE* out = fopen(argv[2], "wb");
if (out == NULL) {

1
src/elf_common.h
View File

@ -995,5 +995,6 @@ typedef struct {
#define R_X86_64_TPOFF32 23 /* Offset in static TLS block */
#define R_X86_64_IRELATIVE 37
#define NT_GNU_BUILD_ID 3 /* Note type for .note.gnu.build-id */
#endif /* !_SYS_ELF_COMMON_H_ */