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windows: do not return invalid error for psuedo-handle functions

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GetCurrentProcess and GetCurrentThread return -1 and -2 respectively. We
could arguably hard code those values, but MSDN cautions not to; I'm
sure this advice is old now, given that the psuedo handles for tokens
(not processes/threads) are now implemented with inline functions in the
headers for Windows 8, but anyway, we'll follow Microsoft's advice.
However, regardless of that, these functions never ever return an error.
MSDN doesn't indicate that they do, reverse engineering the functions
doesn't indicate that they do, and checking against 0 is just plain
wrong, considering 0!=INVALID_HANDLE_VALUE; however
INVALID_HANDLE_VALUE==-1, so that's not correct either. In fact,
checking any value and returning any error does not make sense.
Incidently having to check code for the pseudo handle is more verbose
too.

In order to make this function do the correct thing and meet the spec,
remove the error value from the return.

Change-Id: If03c9dab001be3bf5a04999aef20dbfcf8a4f405
Reviewed-on: https://go-review.googlesource.com/c/sys/+/196798
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
This commit is contained in:
Jason A. Donenfeld
2019-09-21 21:22:07 +02:00
parent 5c00192e8c
commit 2dccfee4fd
4 changed files with 10 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
windows/security_windows.go
View File

@@ -652,17 +652,9 @@ type Token Handle
// associated with current process. It is a real
// token that needs to be closed, unlike
// GetCurrentProcessToken.
func OpenCurrentProcessToken() (Token, error) {
p, e := GetCurrentProcess()
if e != nil {
return 0, e
}
var t Token
e = OpenProcessToken(p, TOKEN_QUERY|TOKEN_DUPLICATE, &t)
if e != nil {
return 0, e
}
return t, nil
func OpenCurrentProcessToken() (token Token, err error) {
err = OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY|TOKEN_DUPLICATE, &token)
return
}
// GetCurrentProcessToken returns the access token associated with

4
windows/syscall_windows.go
View File

@@ -178,8 +178,8 @@ func NewCallbackCDecl(fn interface{}) uintptr {
//sys TerminateProcess(handle Handle, exitcode uint32) (err error)
//sys GetExitCodeProcess(handle Handle, exitcode *uint32) (err error)
//sys GetStartupInfo(startupInfo *StartupInfo) (err error) = GetStartupInfoW
//sys GetCurrentProcess() (pseudoHandle Handle, err error)
//sys GetCurrentThread() (pseudoHandle Handle, err error)
//sys GetCurrentProcess() (pseudoHandle Handle)
//sys GetCurrentThread() (pseudoHandle Handle)
//sys GetProcessTimes(handle Handle, creationTime *Filetime, exitTime *Filetime, kernelTime *Filetime, userTime *Filetime) (err error)
//sys DuplicateHandle(hSourceProcessHandle Handle, hSourceHandle Handle, hTargetProcessHandle Handle, lpTargetHandle *Handle, dwDesiredAccess uint32, bInheritHandle bool, dwOptions uint32) (err error)
//sys WaitForSingleObject(handle Handle, waitMilliseconds uint32) (event uint32, err error) [failretval==0xffffffff]

3
windows/syscall_windows_test.go
View File

@@ -250,8 +250,7 @@ func TestGetNamedSecurityInfo(t *testing.T) {
}
func TestGetSecurityInfo(t *testing.T) {
process, _ := windows.GetCurrentProcess()
sd, err := windows.GetSecurityInfo(process, windows.SE_KERNEL_OBJECT, windows.DACL_SECURITY_INFORMATION)
sd, err := windows.GetSecurityInfo(windows.GetCurrentProcess(), windows.SE_KERNEL_OBJECT, windows.DACL_SECURITY_INFORMATION)
if err != nil {
t.Fatal(err)
}

22
windows/zsyscall_windows.go
View File

@@ -1209,29 +1209,15 @@ func GetStartupInfo(startupInfo *StartupInfo) (err error) {
return
}
func GetCurrentProcess() (pseudoHandle Handle, err error) {
r0, _, e1 := syscall.Syscall(procGetCurrentProcess.Addr(), 0, 0, 0, 0)
func GetCurrentProcess() (pseudoHandle Handle) {
r0, _, _ := syscall.Syscall(procGetCurrentProcess.Addr(), 0, 0, 0, 0)
pseudoHandle = Handle(r0)
if pseudoHandle == 0 {
if e1 != 0 {
err = errnoErr(e1)
} else {
err = syscall.EINVAL
}
}
return
}
func GetCurrentThread() (pseudoHandle Handle, err error) {
r0, _, e1 := syscall.Syscall(procGetCurrentThread.Addr(), 0, 0, 0, 0)
func GetCurrentThread() (pseudoHandle Handle) {
r0, _, _ := syscall.Syscall(procGetCurrentThread.Addr(), 0, 0, 0, 0)
pseudoHandle = Handle(r0)
if pseudoHandle == 0 {
if e1 != 0 {
err = errnoErr(e1)
} else {
err = syscall.EINVAL
}
}
return
}