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/********************************************************/
/* ntapi: Native API core library */
/* Copyright (C) 2013--2021 SysDeer Technologies, LLC */
/* Released under GPLv2 and GPLv3; see COPYING.NTAPI. */
/********************************************************/
#include <psxtypes/psxtypes.h>
#include <pemagine/pemagine.h>
#include <dalist/dalist.h>
#include <ntapi/ntapi.h>
#include "ntapi_impl.h"
struct callback_ctx {
struct dalist_ex * ldr_state_snapshot;
struct pe_ldr_tbl_entry * ldr_tbl_entry;
void * image_base;
uint32_t load_count;
int32_t status;
};
static int __cdecl __find_next_module_to_unload(
struct pe_ldr_tbl_entry * ldr_tbl_entry,
enum pe_callback_reason int_callback_reason,
void * context)
{
struct dalist_node * node;
struct callback_ctx * ctx;
ctx = (struct callback_ctx *)context;
if (int_callback_reason == PE_CALLBACK_REASON_ERROR) {
ctx->status = NT_STATUS_UNSUCCESSFUL;
return ctx->status;
} else if (int_callback_reason != PE_CALLBACK_REASON_ITEM) {
ctx->status = NT_STATUS_SUCCESS;
return 1;
} else if (!ldr_tbl_entry->dll_base) {
ctx->status = NT_STATUS_SUCCESS;
return 1;
}
ctx->status = dalist_get_node_by_key(
ctx->ldr_state_snapshot,
(struct dalist_node_ex **)&node,
(uintptr_t)ldr_tbl_entry->dll_base,
DALIST_NODE_TYPE_EXISTING,
0);
if (ctx->status != DALIST_OK)
return -1;
else if (node)
return 1;
else if (!ctx->image_base || (ldr_tbl_entry->load_count < ctx->load_count)) {
ctx->image_base = ldr_tbl_entry->dll_base;
ctx->load_count = ldr_tbl_entry->load_count;
ctx->ldr_tbl_entry = ldr_tbl_entry;
}
return 1;
}
int __cdecl __ntapi_ldr_revert_state_to_snapshot(
__in struct dalist_ex * ldr_state_snapshot)
{
struct callback_ctx ctx;
uint32_t i;
if (!ldr_state_snapshot->free && !ldr_state_snapshot->memfn_ptr)
return NT_STATUS_BUFFER_TOO_SMALL;
ctx.ldr_state_snapshot = ldr_state_snapshot;
ctx.image_base = (void *)0;
ctx.load_count = 0;
pe_enum_modules_in_load_order(
__find_next_module_to_unload,
&ctx);
while ((ctx.image_base) && (ctx.status == NT_STATUS_SUCCESS)) {
if (ctx.load_count == 0xffff) {
ctx.load_count = 1;
ctx.ldr_tbl_entry->load_count = 1;
ctx.ldr_tbl_entry->entry_point = (void *)0;
ctx.ldr_tbl_entry->flags = 0;
}
for (i=0; i<ctx.load_count; i++)
__ntapi->ldr_unload_dll(ctx.image_base);
__ntapi->zw_unmap_view_of_section(
NT_CURRENT_PROCESS_HANDLE,
ctx.image_base);
ctx.image_base = (void *)0;
ctx.load_count = 0;
pe_enum_modules_in_load_order(
__find_next_module_to_unload,
&ctx);
}
return ctx.status;
}
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