Blame src/process/ntapi_tt_map_image_as_data.c

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/********************************************************/
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/*  ntapi: Native API core library                      */
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/*  Copyright (C) 2013--2016  Z. Gilboa                 */
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/*  Released under GPLv2 and GPLv3; see COPYING.NTAPI.  */
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/********************************************************/
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#include <psxtypes/psxtypes.h>
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#include <pemagine/pemagine.h>
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#include <ntapi/nt_section.h>
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#include <ntapi/nt_process.h>
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#include <ntapi/ntapi.h>
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#include "ntapi_impl.h"
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static nt_sqos const sqos = {
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	sizeof(sqos),
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	NT_SECURITY_IMPERSONATION,
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	NT_SECURITY_TRACKING_DYNAMIC,
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	1};
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static int32_t __tt_exec_unmap_image(nt_executable_image * image, void * base, int32_t status)
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{
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	int32_t ret;
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	if (base)
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		if ((ret = __ntapi->zw_unmap_view_of_section(
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				NT_CURRENT_PROCESS_HANDLE,
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				base)))
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			return ret;
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	if (image->hsection)
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		if ((ret = __ntapi->zw_close(image->hsection)))
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			return ret;
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	return status;
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}
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int32_t	__stdcall __ntapi_tt_exec_unmap_image(nt_executable_image * image)
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{
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	return __tt_exec_unmap_image(image,image->addr,0);
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}
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int32_t __stdcall __ntapi_tt_exec_map_image_as_data(nt_executable_image * image)
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{
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	int32_t				status;
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	uint16_t *			pi16;
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	uint32_t *			pi32;
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	nt_sec_size			sec_size;
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	size_t				view_size;
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	void *				base;
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	void *				hsection;
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	struct pe_image_dos_hdr *	dos;
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	struct pe_coff_file_hdr *	coff;
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	union  pe_opt_hdr *		opt;
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	struct pe_sec_hdr *		sec;
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	nt_oa oa = {sizeof(oa),
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		    0,0,0,0,(nt_sqos *)&sqos};
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	base = 0;
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	sec_size.quad = 0;
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	view_size = image->size;
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	if ((status = __ntapi->zw_create_section(
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			&hsection,
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			NT_SECTION_MAP_READ,
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			&oa,
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			&sec_size,
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			NT_PAGE_READONLY,
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			NT_SEC_RESERVE,image->hfile)))
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		return status;
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	if ((status = __ntapi->zw_map_view_of_section(
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			hsection,
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			NT_CURRENT_PROCESS_HANDLE,
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			&base,
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			0,0,0,
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			&view_size,
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			NT_VIEW_UNMAP,0,
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			NT_PAGE_READONLY)))
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		return __tt_exec_unmap_image(
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			image,base,status);
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	if (!(dos = pe_get_image_dos_hdr_addr(base)))
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		return 0;
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	pi32 = (uint32_t *)dos->dos_lfanew;
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	if ((*pi32 + sizeof(*coff)) > view_size)
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		return __tt_exec_unmap_image(
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			image,base,NT_STATUS_INVALID_IMAGE_FORMAT);
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	if (!(coff = pe_get_image_coff_hdr_addr(base)))
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		return 0;
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	if (!(opt = pe_get_image_opt_hdr_addr(base)))
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		return 0;
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	sec  = pe_get_image_section_tbl_addr(base);
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	pi16 = (uint16_t *)coff->num_of_sections;
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	if (((size_t)sec-(size_t)base + *pi16 * sizeof(*sec)) > view_size)
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		return __tt_exec_unmap_image(
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			image,base,NT_STATUS_INVALID_IMAGE_FORMAT);
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	/* subsystem: same offset (pe32, pe32+) */
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	pi16 = (uint16_t *)opt;
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	image->magic = *pi16;
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	pi16 = (uint16_t *)opt->opt_hdr_32.subsystem;
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	image->subsystem = *pi16;
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	pi16 = (uint16_t *)coff->characteristics;
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	image->characteristics = *pi16;
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	image->hsection = hsection;
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	image->addr = base;
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	image->size = view_size;
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	return status;
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}