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syscall: introduce SysProcAttr.AdditionalInheritedHandles on Windows

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This allows users to specify handles that they explicitly want to be
inherited by the new process. These handles must already be marked as
inheritable.

Updates #44011.
Updates #21085.

Change-Id: Ib18322e7dc2909e68c4209e80385492804fa15d3
Reviewed-on: https://go-review.googlesource.com/c/go/+/288298
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
This commit is contained in:
Jason A. Donenfeld 2021-01-31 18:07:43 +01:00
parent 2d760816ff
commit 3146166baa
1 changed files with 9 additions and 7 deletions
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2
src/syscall/exec_windows.go
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@ -242,6 +242,7 @@ type SysProcAttr struct {
ProcessAttributes *SecurityAttributes // if set, applies these security attributes as the descriptor for the new process
ThreadAttributes *SecurityAttributes // if set, applies these security attributes as the descriptor for the main thread of the new process
NoInheritHandles bool // if set, each inheritable handle in the calling process is not inherited by the new process
AdditionalInheritedHandles []Handle // a list of additional handles, already marked as inheritable, that will be inherited by the new process
}
var zeroProcAttr ProcAttr
@ -337,6 +338,7 @@ func StartProcess(argv0 string, argv []string, attr *ProcAttr) (pid int, handle
si.StdOutput = fd[1]
si.StdErr = fd[2]
fd = append(fd, sys.AdditionalInheritedHandles...)
// Do not accidentally inherit more than these handles.
err = updateProcThreadAttribute(si.ProcThreadAttributeList, 0, _PROC_THREAD_ATTRIBUTE_HANDLE_LIST, uintptr(unsafe.Pointer(&fd[0])), uintptr(len(fd))*unsafe.Sizeof(fd[0]), 0, nil)
if err != nil {