Blame src/output/pe_output_mdso_libraries.c

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/***************************************************************/
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/*  perk: PE Resource Kit                                      */
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/*  Copyright (C) 2015--2021  SysDeer Technologies, LLC        */
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/*  Released under GPLv2 and GPLv3; see COPYING.PERK.          */
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/***************************************************************/
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#include <stdint.h>
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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 <errno.h>
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#include <mdso/mdso_specs.h>
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#include <mdso/mdso_structs.h>
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#include <perk/perk.h>
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#include <perk/perk_consts.h>
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#include <perk/perk_output.h>
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#include "perk_reader_impl.h"
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#include "perk_driver_impl.h"
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#include "perk_dprintf_impl.h"
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#include "perk_errinfo_impl.h"
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static int pretty_header(
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	int				fdout,
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	const struct pe_common_ctx *	cctx)
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{
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	return (cctx->fmtflags & PERK_PRETTY_YAML)
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		? pe_dprintf(fdout,"dsolibs:\n")
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		: 0;
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}
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static int pretty_dsolib_header(
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	int				fdout,
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	const struct pe_common_ctx *	cctx,
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	const char *			name)
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{
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	if ((cctx->fmtflags & PERK_PRETTY_YAML) && (cctx->fmtflags & PERK_OUTPUT_MDSO_SYMS))
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		return pe_dprintf(fdout,"  %s:\n",name);
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	else if (cctx->fmtflags & PERK_PRETTY_YAML)
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		return pe_dprintf(fdout,"- %s:\n",name);
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	else if (cctx->fmtflags & PERK_OUTPUT_MDSO_SYMS)
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		return pe_dprintf(fdout,"%s:\n",name);
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	else
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		return pe_dprintf(fdout,"%s\n",name);
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}
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static int pretty_dsolib_item(
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	int				fdout,
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	const struct pe_common_ctx *	cctx,
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	const char *			name)
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{
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	if (cctx->fmtflags & PERK_PRETTY_YAML)
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		return pe_dprintf(fdout,"  - %s\n",name);
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	else
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		return pe_dprintf(fdout,"%s\n",name);
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}
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static unsigned char * dsolib_meta(const struct pe_image_meta * m, int i)
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{
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	struct mdso_raw_meta_record_m32 *	mdso32;
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	struct mdso_raw_meta_record_m64 *	mdso64;
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	if (m->m_opt.oh_std.coh_magic == PE_MAGIC_PE32_PLUS) {
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		mdso64 = (struct mdso_raw_meta_record_m64 *)m->r_dsometa + i;
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		return mdso64->mrec_base;
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	} else {
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		mdso32 = (struct mdso_raw_meta_record_m32 *)m->r_dsometa + i;
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		return mdso32->mrec_base;
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	}
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}
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static char * dsolib_name(const struct pe_image_meta * m, int i)
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{
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	uintptr_t				va;
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	uint64_t				rva;
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	uint32_t				roffset;
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	struct mdso_raw_meta_record_m32 *	mdso32;
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	struct mdso_raw_meta_record_m64 *	mdso64;
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	if (m->m_opt.oh_std.coh_magic == PE_MAGIC_PE32_PLUS) {
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		mdso64  = (struct mdso_raw_meta_record_m64 *)m->r_dsometa + i;
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		va      = pe_read_quad(mdso64->mrec_name);
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		rva     = va - m->m_opt.oh_mem.coh_image_base;
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		if (rva >> 32)
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			return 0;
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	} else {
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		mdso32  = (struct mdso_raw_meta_record_m32 *)m->r_dsometa + i;
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		va      = pe_read_long(mdso32->mrec_name);
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		rva     = va - m->m_opt.oh_mem.coh_image_base;
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	}
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	if (pe_get_roffset_from_rva(m,(uint32_t)rva,&roffset) < 0)
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		return 0;
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	return m->r_image.map_addr + roffset;
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}
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static unsigned char * dsosym_meta(const struct pe_image_meta * m, int j)
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{
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	uint64_t			va;
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	uint32_t			rva;
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	uint32_t			roffset;
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	struct mdso_raw_sym_entry_m32 *	sym32;
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	struct mdso_raw_sym_entry_m64 *	sym64;
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	int				idx;
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	if (m->m_opt.oh_std.coh_magic == PE_MAGIC_PE32_PLUS) {
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		sym64 = (struct mdso_raw_sym_entry_m64 *)m->r_dsosyms + j;
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		va    = pe_read_quad(sym64->msym_meta);
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		rva   = pe_read_long(sym64->msym_meta);
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	} else {
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		sym32 = (struct mdso_raw_sym_entry_m32 *)m->r_dsosyms + j;
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		va    = pe_read_long(sym32->msym_meta);
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		rva   = va;
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	}
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	if ((idx = pe_get_named_section_index(m,MDSO_META_SECTION)) >= 0)
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		if (idx != pe_get_block_section_index(m,&(struct pe_block){rva,0}))
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			return (unsigned char *)(-1);
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	if (va > rva)
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		return 0;
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	if (pe_get_roffset_from_rva(m,rva,&roffset) < 0)
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		return 0;
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	return (unsigned char *)m->r_image.map_addr + roffset;
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}
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static char * dsosym_string(const struct pe_image_meta * m, int j)
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{
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	uint64_t			va;
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	uint32_t			rva;
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	uint32_t			roffset;
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	struct mdso_raw_sym_entry_m32 *	sym32;
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	struct mdso_raw_sym_entry_m64 *	sym64;
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	int				idx;
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	if (m->m_opt.oh_std.coh_magic == PE_MAGIC_PE32_PLUS) {
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		sym64 = (struct mdso_raw_sym_entry_m64 *)m->r_dsosyms + j;
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		va    = pe_read_quad(sym64->msym_string);
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		rva   = pe_read_long(sym64->msym_string);
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	} else {
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		sym32 = (struct mdso_raw_sym_entry_m32 *)m->r_dsosyms + j;
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		va    = pe_read_long(sym32->msym_string);
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		rva   = va;
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	}
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	if ((idx = pe_get_named_section_index(m,MDSO_STRS_SECTION)) >= 0)
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		if (idx != pe_get_block_section_index(m,&(struct pe_block){rva,0}))
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			return (char *)(-2);
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	if (va > rva)
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		return 0;
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	if (pe_get_roffset_from_rva(m,rva,&roffset) < 0)
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		return 0;
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	return m->r_image.map_addr + roffset;
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}
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int pe_output_mdso_libraries(
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	const struct pe_driver_ctx *	dctx,
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	const struct pe_image_meta *	m)
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{
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	int				i,j;
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	int				fdout;
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	char *				name;
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	unsigned char *			symmeta;
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	unsigned char *			dsometa;
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	char *				symstr;
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	const struct pe_common_ctx *	cctx = dctx->cctx;
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	fdout = pe_driver_fdout(dctx);
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	if (!m->m_stats.t_ndsolibs)
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		return 0;
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	if (pe_get_image_abi(m,0) == PE_ABI_UNSUPPORTED)
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		return PERK_CUSTOM_ERROR(
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			dctx,PERK_ERR_UNSUPPORTED_ABI);
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	if ((pretty_header(fdout,cctx)) < 0)
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		return PERK_FILE_ERROR(dctx);
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	for (i=0; i<m->m_stats.t_ndsolibs; i++) {
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		dsometa = dsolib_meta(m,i);
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		if (!(name = dsolib_name(m,i)))
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			return PERK_CUSTOM_ERROR(
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				dctx,PERK_ERR_IMAGE_MALFORMED);
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		if ((pretty_dsolib_header(fdout,cctx,name)) < 0)
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			return PERK_FILE_ERROR(dctx);
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		if (cctx->fmtflags & PERK_OUTPUT_MDSO_SYMS) {
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			for (j=0; j<m->m_stats.t_ndsosyms; j++) {
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				if (!(symmeta = dsosym_meta(m,j)))
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					return PERK_CUSTOM_ERROR(
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						dctx,PERK_ERR_IMAGE_MALFORMED);
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				if (!(symstr = dsosym_string(m,j)))
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					return PERK_CUSTOM_ERROR(
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						dctx,PERK_ERR_IMAGE_MALFORMED);
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				if (symmeta == dsometa)
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					if ((pretty_dsolib_item(fdout,cctx,symstr)) < 0)
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						return PERK_FILE_ERROR(dctx);
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			}
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		}
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	}
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	return 0;
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}