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/****************************************************************/
/* mdso: midipix dso scavenger */
/* Copyright (C) 2015--2021 SysDeer Technologies, LLC */
/* Released under GPLv2 and GPLv3; see COPYING.MDSO. */
/****************************************************************/
#include <stdio.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <mdso/mdso.h>
#include <mdso/mdso_specs.h>
#include "mdso_object_impl.h"
#include "mdso_errinfo_impl.h"
#include "perk_consts.h"
#include "perk_structs.h"
struct mdso_unified_record {
unsigned char data[80];
};
struct mdso_dsometa_object {
struct pe_raw_coff_object_hdr hdr;
struct pe_raw_sec_hdr sec[2];
struct mdso_unified_record rec[1];
struct pe_raw_coff_reloc rel[1];
struct pe_raw_coff_symbol sym[8];
struct pe_raw_coff_strtbl cst;
};
int mdso_objgen_dsometa(
const struct mdso_driver_ctx * dctx,
struct mdso_object * vobj)
{
struct mdso_dsometa_object * dsometa;
struct pe_raw_coff_symbol * symrec;
void * addr;
unsigned char * mark;
struct pe_raw_aux_rec_section * aux;
size_t buflen;
uint32_t liblen;
uint32_t cstlen;
uint32_t objlen;
uint32_t aattr;
uint32_t sattr;
uint32_t rattr;
uint16_t oattr;
uint16_t machine;
uint16_t reltype;
uint32_t relrva;
uint32_t reclen;
uint32_t recoff;
uint32_t reloff;
uint32_t symoff;
uint32_t cstoff;
uint32_t datoff;
uint32_t stroff;
if ((buflen = strlen(dctx->cctx->libname)) > 1024*1024)
return MDSO_CUSTOM_ERROR(dctx,MDSO_ERR_INVALID_DATA);
liblen = (uint32_t)buflen;
cstlen = (3 * liblen) + 48;
objlen = sizeof(*dsometa) + cstlen;
if (vobj->addr && (vobj->size < objlen))
return MDSO_BUFFER_ERROR(dctx);
if ((addr = vobj->addr)) {
(void)0;
} else {
vobj->size = objlen;
vobj->mapstrsnum = 1;
vobj->mapstrslen = 10 + liblen;
if (!vobj->name)
return 0;
else if (mdso_create_object(dctx,vobj) < 0)
return MDSO_NESTED_ERROR(dctx);
}
dsometa = (struct mdso_dsometa_object *)vobj->addr;
if (dctx->cctx->drvflags & MDSO_DRIVER_QUAD_PTR) {
reclen = sizeof(struct mdso_meta_record_m64);
aattr = PE_IMAGE_SCN_ALIGN_16BYTES;
machine = PE_IMAGE_FILE_MACHINE_AMD64;
reltype = PE_IMAGE_REL_AMD64_ADDR64;
relrva = 8;
} else {
reclen = sizeof(struct mdso_meta_record_m32);
aattr = PE_IMAGE_SCN_ALIGN_8BYTES;
machine = PE_IMAGE_FILE_MACHINE_I386;
reltype = PE_IMAGE_REL_I386_DIR32;
relrva = 4;
}
sattr = PE_IMAGE_SCN_ALIGN_1BYTES;
sattr |= PE_IMAGE_SCN_MEM_READ;
sattr |= PE_IMAGE_SCN_CNT_INITIALIZED_DATA;
rattr = aattr;
rattr |= PE_IMAGE_SCN_MEM_READ;
rattr |= PE_IMAGE_SCN_CNT_INITIALIZED_DATA;
oattr = PE_IMAGE_FILE_LINE_NUMS_STRIPPED;
recoff = offsetof(struct mdso_dsometa_object,rec);
reloff = offsetof(struct mdso_dsometa_object,rel);
symoff = offsetof(struct mdso_dsometa_object,sym);
cstoff = offsetof(struct pe_raw_coff_strtbl,cst_data);
datoff = 0;
stroff = objlen - liblen - 16;
stroff += 0xf;
stroff |= 0xf;
stroff ^= 0xf;
/* coff object header */
mdso_obj_write_short(dsometa->hdr.cfh_machine,machine);
mdso_obj_write_short(dsometa->hdr.cfh_num_of_sections,2);
mdso_obj_write_long(dsometa->hdr.cfh_ptr_to_sym_tbl,symoff);
mdso_obj_write_long(dsometa->hdr.cfh_num_of_syms,8);
mdso_obj_write_short(dsometa->hdr.cfh_characteristics,oattr);
/* .dsostrs section header */
memcpy(dsometa->sec[0].sh_name,".dsostrs",8);
mdso_obj_write_long(dsometa->sec[0].sh_size_of_raw_data,liblen+1);
mdso_obj_write_long(dsometa->sec[0].sh_ptr_to_raw_data,stroff);
mdso_obj_write_long(dsometa->sec[0].sh_characteristics,sattr);
/* .dsometa section header */
memcpy(dsometa->sec[1].sh_name,".dsometa",8);
mdso_obj_write_long(dsometa->sec[1].sh_size_of_raw_data,reclen);
mdso_obj_write_long(dsometa->sec[1].sh_ptr_to_raw_data,recoff);
mdso_obj_write_long(dsometa->sec[1].sh_ptr_to_relocs,reloff);
mdso_obj_write_short(dsometa->sec[1].sh_num_of_relocs,1);
mdso_obj_write_long(dsometa->sec[1].sh_characteristics,rattr);
/* .dsometa section data: flags */
mark = dsometa->rec[0].data;
mdso_obj_write_long(&mark[2*relrva],dctx->cctx->dsoflags);
/* .dsometa relocation record: .name */
mdso_obj_write_long(dsometa->rel[0].rel_sym,6);
mdso_obj_write_long(dsometa->rel[0].rel_rva,relrva);
mdso_obj_write_short(dsometa->rel[0].rel_type,reltype);
/* coff string table */
mdso_obj_write_long(dsometa->cst.cst_size,cstlen);
/* coff symbol table */
symrec = dsometa->sym;
mark = dsometa->cst.cst_data;
/* coff symbol: .file */
symrec[0].cs_storage_class[0] = PE_IMAGE_SYM_CLASS_FILE;
symrec[0].cs_num_of_aux_symbols[0] = 1;
mdso_obj_write_short(&symrec[0].cs_section_number[0],PE_IMAGE_SYM_DEBUG);
mdso_obj_write_long(&symrec[1].cs_name[4],cstoff+datoff);
memcpy(symrec[0].cs_name,".file",5);
memcpy(&mark[0],".dsometa_",9);
memcpy(&mark[9],dctx->cctx->libname,liblen);
memcpy(&mark[9+liblen],".s",2);
datoff += 12 + liblen;
mark += 12 + liblen;
symrec += 2;
/* coff symbol: .dsostrs */
symrec[0].cs_storage_class[0] = PE_IMAGE_SYM_CLASS_STATIC;
symrec[0].cs_num_of_aux_symbols[0] = 1;
mdso_obj_write_short(symrec[0].cs_section_number,1);
memcpy(symrec[0].cs_name,".dsostrs",8);
aux = (struct pe_raw_aux_rec_section *)&symrec[1];
mdso_obj_write_long(aux->aux_size,liblen+1);
mdso_obj_write_short(aux->aux_num_of_relocs,0);
datoff += 0;
mark += 0;
symrec += 2;
/* coff symbol: .dsometa */
symrec[0].cs_storage_class[0] = PE_IMAGE_SYM_CLASS_STATIC;
symrec[0].cs_num_of_aux_symbols[0] = 1;
mdso_obj_write_short(symrec[0].cs_section_number,2);
memcpy(symrec[0].cs_name,".dsometa",8);
aux = (struct pe_raw_aux_rec_section *)&symrec[1];
mdso_obj_write_long(aux->aux_size,reclen);
mdso_obj_write_short(aux->aux_num_of_relocs,1);
datoff += 0;
mark += 0;
symrec += 2;
/* coff symbol: .libname */
symrec[0].cs_storage_class[0] = PE_IMAGE_SYM_CLASS_STATIC;
symrec[0].cs_num_of_aux_symbols[0] = 0;
mdso_obj_write_short(symrec[0].cs_section_number,1);
memcpy(symrec[0].cs_name,".libname",8);
datoff += 0;
mark += 0;
symrec += 1;
/* coff symbol: .dsometa_libname */
symrec[0].cs_storage_class[0] = PE_IMAGE_SYM_CLASS_EXTERNAL;
symrec[0].cs_num_of_aux_symbols[0] = 0;
mdso_obj_write_short(symrec[0].cs_section_number,2);
mdso_obj_write_long(&symrec[0].cs_name[4],cstoff+datoff);
memcpy(&mark[0],".dsometa_",9);
memcpy(&mark[9],dctx->cctx->libname,liblen);
/* archive symbol map */
if (vobj->mapstrs)
memcpy(vobj->mapstrs,mark,9+liblen);
/* .libname */
mark = dsometa->hdr.cfh_machine;
memcpy(&mark[stroff],dctx->cctx->libname,liblen);
/* fs object unmap */
if (!addr)
munmap(vobj->addr,vobj->size);
/* tada */
return 0;
}
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