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/*****************************************************************************/
/* pemagination: a (virtual) tour into portable bits and executable bytes */
/* Copyright (C) 2013--2017 Z. Gilboa */
/* Released under GPLv2 and GPLv3; see COPYING.PEMAGINE. */
/*****************************************************************************/
#include <psxtypes/psxtypes.h>
#include <pemagine/pemagine.h>
#include "pe_os.h"
static int32_t pe_get_device_dos_drive_letter(
void * hntdll,
os_zw_query_object * zw_query_object,
uintptr_t * dbuffer,
uint32_t dbufsize,
wchar16_t * devname,
size_t devnamelen,
wchar16_t * letter)
{
int32_t status;
void * hdevice;
int sigh;
size_t idx;
size_t cap;
uint32_t len;
struct os_oa oa;
struct os_iosb iosb;
wchar16_t * src;
wchar16_t * dst;
struct pe_unicode_str path;
struct pe_unicode_str * dpath;
os_zw_open_file * zw_open_file;
os_zw_close * zw_close;
wchar16_t namebuf[8] = {
'\\','?','?','\\',
'X',':','\\',0};
unsigned char letters[26] = {
'C','Z','Y','X','W','V',
'E','H','F','G','D','I',
'P','Q','R','S','T','U',
'J','K','L','M','N','O',
'A','B'};
/* init */
if (!(zw_open_file = (os_zw_open_file *)pe_get_procedure_address(
hntdll,"ZwOpenFile")))
return OS_STATUS_INTERNAL_ERROR;
if (!(zw_close = (os_zw_close *)pe_get_procedure_address(
hntdll,"ZwClose")))
return OS_STATUS_INTERNAL_ERROR;
/* path */
path.buffer = namebuf;
path.strlen = 7 * sizeof(wchar16_t);
path.maxlen = 0;
/* oa */
oa.len = sizeof(struct os_oa);
oa.root_dir = 0;
oa.obj_name = &path;
oa.obj_attr = 0;
oa.sec_desc = 0;
oa.sec_qos = 0;
/* just a few rounds of submissiveness */
for (sigh=0; sigh<26; sigh++) {
namebuf[4] = letters[sigh];
status = zw_open_file(
&hdevice,
OS_SEC_SYNCHRONIZE
| OS_FILE_READ_ATTRIBUTES
| OS_FILE_READ_ACCESS,
&oa,&iosb,
OS_FILE_SHARE_READ
| OS_FILE_SHARE_WRITE
| OS_FILE_SHARE_DELETE,
OS_FILE_DIRECTORY_FILE);
if (status == OS_STATUS_SUCCESS) {
status = zw_query_object(
hdevice,
OS_OBJECT_NAME_INFORMATION,
dbuffer,dbufsize,&len);
if (status == OS_STATUS_SUCCESS) {
dpath = (struct pe_unicode_str *)dbuffer;
src = devname;
dst = dpath->buffer;
idx = 0;
cap = devnamelen / sizeof(wchar16_t);
for (; idx<cap && src[idx]==dst[idx]; )
idx++;
if (idx==cap && dst[idx]=='\\') {
zw_close(hdevice);
*letter = letters[sigh];
return OS_STATUS_SUCCESS;
}
}
zw_close(hdevice);
}
}
return OS_STATUS_NOT_SUPPORTED;
}
int32_t pe_load_framework_loader(
void ** baseaddr,
struct pe_framework_runtime_data * rtdata,
uintptr_t * buffer,
uint32_t bufsize,
uint32_t * flags)
{
int32_t status;
struct pe_unicode_str path;
struct pe_unicode_str * npath;
uintptr_t addr;
uintptr_t * dbuffer;
uint32_t dbufsize;
wchar16_t * ldrdir;
wchar16_t * slash;
wchar16_t * wch;
wchar16_t * cap;
wchar16_t letter;
uint32_t len;
int mup;
void * hntdll;
os_zw_query_object * zw_query_object;
os_ldr_load_dll * ldr_load_dll;
/* init */
if (!(hntdll = pe_get_ntdll_module_handle()))
return OS_STATUS_INTERNAL_ERROR;
if (!(zw_query_object = (os_zw_query_object *)pe_get_procedure_address(
hntdll,"ZwQueryObject")))
return OS_STATUS_INTERNAL_ERROR;
if (!(ldr_load_dll = (os_ldr_load_dll *)pe_get_procedure_address(
hntdll,"LdrLoadDll")))
return OS_STATUS_INTERNAL_ERROR;
/* loader native path */
if ((status = zw_query_object(
rtdata->hloader,
OS_OBJECT_NAME_INFORMATION,
buffer,bufsize,&len)))
return status;
/* integrity */
if (len == sizeof(struct pe_unicode_str))
return OS_STATUS_BAD_FILE_TYPE;
/* first sigh */
npath = (struct pe_unicode_str *)buffer;
wch = npath->buffer;
cap = npath->buffer + (npath->strlen / sizeof(wchar16_t));
if ((cap < &wch[8])
|| (wch[0] != '\\')
|| (wch[1] != 'D')
|| (wch[2] != 'e')
|| (wch[3] != 'v')
|| (wch[4] != 'i')
|| (wch[5] != 'c')
|| (wch[6] != 'e')
|| (wch[7] != '\\'))
return OS_STATUS_NOT_SUPPORTED;
mup = (cap > &wch[11])
&& (wch[8]=='M')
&& (wch[9]=='u')
&& (wch[10]=='p')
&& (wch[11]=='\\');
slash = mup ? &wch[12] : &wch[8];
for (; (*slash != '\\') && (slash < cap); )
slash++;
if (slash == cap)
return OS_STATUS_INTERNAL_ERROR;
if (mup)
for (++slash; (*slash != '\\') && (slash < cap); )
slash++;
if (slash == cap)
return OS_STATUS_INTERNAL_ERROR;
/* second sigh */
addr = (uintptr_t)cap;
addr += sizeof(uintptr_t) - 1;
addr /= sizeof(uintptr_t);
addr *= sizeof(uintptr_t);
dbuffer = (uintptr_t *)addr;
dbufsize = bufsize;
dbufsize -= (dbuffer - buffer) * sizeof(uintptr_t);
if ((status = pe_get_device_dos_drive_letter(
hntdll,
zw_query_object,
dbuffer,dbufsize,
npath->buffer,
(slash - npath->buffer) * sizeof(wchar16_t),
&letter)))
return status;
slash = &slash[-2];
slash[0] = letter;
slash[1] = ':';
path.buffer = slash;
path.strlen = (cap - slash) * sizeof(wchar16_t);
/* third sigh */
for (slash=cap; (slash > path.buffer) && (*slash != '\\'); )
slash--;
if (slash == path.buffer)
return OS_STATUS_INTERNAL_ERROR;
ldrdir = path.buffer;
*slash = 0;
path.strlen -= (++slash - ldrdir) * sizeof(wchar16_t);
path.maxlen = path.strlen;
path.buffer = slash;
/* hoppla */
return ldr_load_dll(
ldrdir,flags,
&path,baseaddr);
}
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