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* init.cc (respawn_wow64_process): Make inline function. Remove

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"noreturn" attribute.  Add additional check if parent process is
	actually a 64 bit process.
	(dll_entry): Only test WOW64 processes with a stack in the usual
	"dangerous" process space area.
This commit is contained in:
Corinna Vinschen
2005-08-14 19:48:07 +00:00
parent 50f196b57f
commit 447419497d
2 changed files with 60 additions and 20 deletions
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8
winsup/cygwin/ChangeLog
View File

@@ -1,3 +1,11 @@
2005-08-14 Corinna Vinschen <corinna@vinschen.de>
* init.cc (respawn_wow64_process): Make inline function. Remove
"noreturn" attribute. Add additional check if parent process is
actually a 64 bit process.
(dll_entry): Only test WOW64 processes with a stack in the usual
"dangerous" process space area.
2005-08-11 Troy Curtiss <trcurtiss@gmail.com> 2005-08-11 Troy Curtiss <trcurtiss@gmail.com>
* fhandler_serial.cc (fhandler_serial::tcgetattr): Return current baud * fhandler_serial.cc (fhandler_serial::tcgetattr): Return current baud

72
winsup/cygwin/init.cc
View File

@@ -15,6 +15,8 @@ details. */
#include "perprocess.h" #include "perprocess.h"
#include "cygtls.h" #include "cygtls.h"
#include "pinfo.h" #include "pinfo.h"
#include <ntdef.h>
#include "ntdll.h"
int NO_COPY dynamically_loaded; int NO_COPY dynamically_loaded;
static char *search_for = (char *) cygthread::stub; static char *search_for = (char *) cygthread::stub;
@@ -88,22 +90,47 @@ munge_threadfunc ()
} }
} }
static void __attribute__ ((noreturn)) inline static void
respawn_wow64_process () respawn_wow64_process ()
{ {
PROCESS_INFORMATION pi; NTSTATUS ret;
STARTUPINFO si; PROCESS_BASIC_INFORMATION pbi;
GetStartupInfo (&si); HANDLE parent;
if (!CreateProcessA (NULL, GetCommandLineA (), NULL, NULL, TRUE,
CREATE_DEFAULT_ERROR_MODE BOOL is_wow64_proc = TRUE; /* Opt on the safe side. */
| GetPriorityClass (GetCurrentProcess ()),
NULL, NULL, &si, &pi)) /* Unfortunately there's no simpler way to retrieve the
api_fatal ("Failed to create process <%s>, %E", GetCommandLineA ()); parent process in NT, as far as I know. Hints welcome. */
CloseHandle (pi.hThread); ret = NtQueryInformationProcess (GetCurrentProcess (),
if (WaitForSingleObject (pi.hProcess, INFINITE) == WAIT_FAILED) ProcessBasicInformation,
api_fatal ("Waiting for process %d failed, %E", pi.dwProcessId); (PVOID) &pbi,
CloseHandle (pi.hProcess); sizeof pbi, NULL);
ExitProcess (0); if (ret == STATUS_SUCCESS
&& (parent = OpenProcess (PROCESS_QUERY_INFORMATION,
FALSE,
pbi.InheritedFromUniqueProcessId)))
{
IsWow64Process (parent, &is_wow64_proc);
CloseHandle (parent);
}
/* The parent is a real 64 bit process? Respawn! */
if (!is_wow64_proc)
{
PROCESS_INFORMATION pi;
STARTUPINFO si;
GetStartupInfo (&si);
if (!CreateProcessA (NULL, GetCommandLineA (), NULL, NULL, TRUE,
CREATE_DEFAULT_ERROR_MODE
| GetPriorityClass (GetCurrentProcess ()),
NULL, NULL, &si, &pi))
api_fatal ("Failed to create process <%s>, %E", GetCommandLineA ());
CloseHandle (pi.hThread);
if (WaitForSingleObject (pi.hProcess, INFINITE) == WAIT_FAILED)
api_fatal ("Waiting for process %d failed, %E", pi.dwProcessId);
CloseHandle (pi.hProcess);
ExitProcess (0);
}
} }
extern void __stdcall dll_crt0_0 (); extern void __stdcall dll_crt0_0 ();
@@ -113,18 +140,23 @@ HMODULE NO_COPY cygwin_hmodule;
extern "C" int WINAPI extern "C" int WINAPI
dll_entry (HANDLE h, DWORD reason, void *static_load) dll_entry (HANDLE h, DWORD reason, void *static_load)
{ {
BOOL is_64bit_machine = FALSE; BOOL is_wow64_proc = FALSE;
switch (reason) switch (reason)
{ {
case DLL_PROCESS_ATTACH: case DLL_PROCESS_ATTACH:
cygwin_hmodule = (HMODULE) h; cygwin_hmodule = (HMODULE) h;
dynamically_loaded = (static_load == NULL); dynamically_loaded = (static_load == NULL);
/* Is the stack at an unusual high address? Check if we're running on
a 64 bit machine. If so, respawn. */ /* Is the stack at an unusual address? This is, an address which
if (&is_64bit_machine >= (PBOOL) 0x400000 is in the usual space occupied by the process image, but below
&& IsWow64Process (hMainProc, &is_64bit_machine) the auto load address of DLLs?
&& is_64bit_machine) Check if we're running in WOW64 on a 64 bit machine *and* are
spawned by a genuine 64 bit process. If so, respawn. */
if (&is_wow64_proc >= (PBOOL) 0x400000
&& &is_wow64_proc <= (PBOOL) 0x10000000
&& IsWow64Process (hMainProc, &is_wow64_proc)
&& is_wow64_proc)
respawn_wow64_process (); respawn_wow64_process ();
prime_threads (); prime_threads ();