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windows/svc: do not pass theService to windows.RegisterServiceCtrlHandlerEx

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windows.RegisterServiceCtrlHandlerEx context parameter is uintptr, so it
is unsafe to pass pointers in that parameter. Use theService global
variable in ctlHandler function instead.

Fixes golang/go#67437

Change-Id: I84c910eaa354603c2a5114421cd61788cb40b86f
Reviewed-on: https://go-review.googlesource.com/c/sys/+/591475
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Quim Muntal <quimmuntal@gmail.com>
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Alex Brainman
2024-06-08 17:11:21 +10:00
parent 673e0f94c1
commit 348425aa18
1 changed files with 2 additions and 3 deletions
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5
windows/svc/service.go
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@@ -199,9 +199,8 @@ var (
)
func ctlHandler(ctl, evtype, evdata, context uintptr) uintptr {
s := (*service)(unsafe.Pointer(context))
e := ctlEvent{cmd: Cmd(ctl), eventType: uint32(evtype), eventData: evdata, context: 123456} // Set context to 123456 to test issue #25660.
s.c <- e
theService.c <- e
return 0
}
@@ -210,7 +209,7 @@ var theService service // This is, unfortunately, a global, which means only one
// serviceMain is the entry point called by the service manager, registered earlier by
// the call to StartServiceCtrlDispatcher.
func serviceMain(argc uint32, argv **uint16) uintptr {
handle, err := windows.RegisterServiceCtrlHandlerEx(windows.StringToUTF16Ptr(theService.name), ctlHandlerCallback, uintptr(unsafe.Pointer(&theService)))
handle, err := windows.RegisterServiceCtrlHandlerEx(windows.StringToUTF16Ptr(theService.name), ctlHandlerCallback, 0)
if sysErr, ok := err.(windows.Errno); ok {
return uintptr(sysErr)
} else if err != nil {