From 80b89c048ce8168a5dd42fd59ec0432d9adf40d9 Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Wed, 17 Jan 2018 21:03:22 +0000
Subject: __ntapi_init(), fork: obtain and keep a handle to the running
 process.

---
 src/internal/ntapi.c        | 19 +++++++++++
 src/internal/ntapi_impl.h   |  1 +
 src/process/ntapi_tt_fork.c | 78 +++++++++++++++++++++++++++------------------
 3 files changed, 67 insertions(+), 31 deletions(-)

(limited to 'src')

diff --git a/src/internal/ntapi.c b/src/internal/ntapi.c
index 06a70fe..1b06bcc 100644
--- a/src/internal/ntapi.c
+++ b/src/internal/ntapi.c
@@ -93,6 +93,8 @@ static int32_t __fastcall __ntapi_init_once(ntapi_vtbl ** pvtbl)
 	int32_t					status;
 	void * 					hntdll;
 	size_t					block_size;
+	nt_oa					oa;
+	nt_cid					cid;
 	ntapi_zw_allocate_virtual_memory *	pfn_zw_allocate_virtual_memory;
 	char					fname_allocate_virtual_memory[] =
 							"ZwAllocateVirtualMemory";
@@ -446,6 +448,23 @@ static int32_t __fastcall __ntapi_init_once(ntapi_vtbl ** pvtbl)
 		(uintptr_t *)&___ntapi,
 		sizeof(ntapi_vtbl));
 
+	/* process handle */
+	oa.len      = sizeof(oa);
+	oa.root_dir = 0;
+	oa.obj_name = 0;
+	oa.obj_attr = 0;
+	oa.sec_desc = 0;
+	oa.sec_qos  = 0;
+
+	cid.process_id = pe_get_current_process_id();
+	cid.thread_id  = pe_get_current_thread_id();
+
+	if ((status = __ntapi->zw_open_process(
+			&internals->hprocess,
+			NT_PROCESS_ALL_ACCESS,
+			&oa,&cid)))
+		return status;
+
 	/* process token */
 	 if ((status = __ntapi->zw_open_process_token(
 			NT_CURRENT_PROCESS_HANDLE,
diff --git a/src/internal/ntapi_impl.h b/src/internal/ntapi_impl.h
index 870e5fd..4c26f55 100644
--- a/src/internal/ntapi_impl.h
+++ b/src/internal/ntapi_impl.h
@@ -82,6 +82,7 @@ typedef struct __attr_ptr_size_aligned__ _ntapi_internals {
 	nt_port_name *					subsystem;
 	nt_security_descriptor				seq_desc;
 	nt_security_quality_of_service			seq_qos;
+	void *						hprocess;
 	void *						htoken;
 	void *						hport_tty_session;
 	void *						hport_tty_daemon;
diff --git a/src/process/ntapi_tt_fork.c b/src/process/ntapi_tt_fork.c
index 485d98b..7b1202d 100644
--- a/src/process/ntapi_tt_fork.c
+++ b/src/process/ntapi_tt_fork.c
@@ -17,13 +17,9 @@
 static intptr_t	__fork_retry_stats  = 0;
 static intptr_t	__fork_resume_stats = 0;
 
-static intptr_t __fastcall __ntapi_tt_fork_finalize(
-	void **		hprocess,
-	void **		hthread)
+static intptr_t __fastcall __ntapi_tt_fork_finalize(void ** hprocess)
 {
 	int32_t			status;
-	nt_oa			oa;
-	nt_cid			cid;
 	int			page;
 	nt_rtdata *		rtdata;
 	ntapi_internals *	__internals;
@@ -31,29 +27,13 @@ static intptr_t __fastcall __ntapi_tt_fork_finalize(
 	__internals = __ntapi_internals();
 	rtdata      = __internals->rtdata;
 
-	*hprocess = 0;
-	*hthread  = 0;
-
-	oa.len		= sizeof(oa);
-	oa.root_dir	= 0;
-	oa.obj_name	= 0;
-	oa.obj_attr	= 0;
-	oa.sec_desc	= &__internals->seq_desc;
-	oa.sec_qos	= &__internals->seq_qos;
-
-	cid.process_id	= pe_get_current_process_id();
-	cid.thread_id	= pe_get_current_thread_id();
-
-	if ((status = __ntapi->zw_open_process(
-			hprocess,
-			NT_PROCESS_ALL_ACCESS,
-			&oa,&cid)))
-		return status;
-
-	if ((status = __ntapi->zw_open_thread(
-			hthread,
-			NT_THREAD_ALL_ACCESS,
-			&oa,&cid)))
+	if ((status = __ntapi->zw_duplicate_object(
+			__internals->hprocess,
+			__internals->hprocess,
+			__internals->hprocess,
+			hprocess,0,0,
+			NT_DUPLICATE_SAME_ATTRIBUTES
+			|NT_DUPLICATE_SAME_ACCESS)))
 		return status;
 
 	if ((status = dalist_init_ex(
@@ -113,13 +93,49 @@ static int32_t __stdcall __fork_thread(void * ctx)
 
 static intptr_t __fastcall __ntapi_tt_fork_child(
 	void *		hresumed,
-	void *		hready)
+	void *		hready,
+	void **		hthread)
 {
 	int32_t			status;
 	nt_thread_params	tparams;
 	nt_timeout		timeout;
 	nt_timeout		zerowait;
 	intptr_t		state;
+	nt_oa			oa;
+	nt_cid			cid;
+	ntapi_internals *	__internals;
+
+	oa.len		= sizeof(oa);
+	oa.root_dir	= 0;
+	oa.obj_name	= 0;
+	oa.obj_attr	= 0;
+	oa.sec_desc	= &__internals->seq_desc;
+	oa.sec_qos	= &__internals->seq_qos;
+
+	cid.process_id	= pe_get_current_process_id();
+	cid.thread_id	= pe_get_current_thread_id();
+
+	__internals = __ntapi_internals();
+
+	status = __ntapi->zw_open_process(
+		&__internals->hprocess,
+		NT_PROCESS_ALL_ACCESS,
+		&oa,&cid);
+
+	if (status == NT_STATUS_SUCCESS)
+		status = __ntapi->zw_open_thread(
+			hthread,
+			NT_THREAD_ALL_ACCESS,
+			&oa,&cid);
+
+	if (status) {
+		__ntapi->zw_set_event(
+			hresumed,0);
+
+		__ntapi->zw_terminate_process(
+			NT_CURRENT_PROCESS_HANDLE,
+			status);
+	}
 
 	at_store(
 		&state,
@@ -282,10 +298,10 @@ intptr_t __fastcall __ntapi_tt_fork(
 
 		if (pid == 0) {
 			__ntapi_tt_fork_child(
-				hresumed,hready);
+				hresumed,hready,hthread);
 
 			return __ntapi_tt_fork_finalize(
-				hprocess,hthread);
+				hprocess);
 
 		} else if (pid > 0) {
 			if (!(__ntapi_tt_fork_parent(
-- 
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