Interpret windows exit codes as a signed integer (#18282)

#17695

The windows exit code is a 32-bit unsigned integer, but the command
interpreter treats it like a signed integer. When a process is killed,
it returns 0xFFFFFFFF (interpreted as -1). We convert the integer to an
signed 32-bit integer to flip it to a -1 to match our expectations, and
fit in our db column.

https://en.wikipedia.org/wiki/Exit_status#Windows

FIxed on both the client and server side.

changes/18282-signed-windows-exit-code

@@ -0,0 +1,2 @@
+* Cast windows exit codes to signed integers to match windows interpreter
+* Fix bug where some scripts got stuck in "upcoming" activity permanently

orbit/changes/18282-signed-windows-exit-code

@@ -0,0 +1 @@
+* Cast windows exit codes to signed integers to match windows interpreter

orbit/pkg/scripts/exec_windows.go

@@ -17,7 +17,14 @@ func execCmd(ctx context.Context, scriptPath string) (output []byte, exitCode in
 	cmd.Dir = filepath.Dir(scriptPath)
 	output, err = cmd.CombinedOutput()
 	if cmd.ProcessState != nil {
-		exitCode = cmd.ProcessState.ExitCode()
+		// The windows exit code is a 32-bit unsigned integer, but the
+		// interpreter treats it like a signed integer. When a process
+		// is killed, it returns 0xFFFFFFFF (interpreted as -1). We
+		// convert the integer to an signed 32-bit integer to flip it
+		// to a -1 to match our expectations, and fit in our db column.
+		//
+		// https://en.wikipedia.org/wiki/Exit_status#Windows
+		exitCode = int(int32(cmd.ProcessState.ExitCode()))
 	}
 	return output, exitCode, err
 }

server/datastore/mysql/scripts.go

@@ -128,7 +128,12 @@ func (ds *Datastore) SetHostScriptExecutionResult(ctx context.Context, result *f
 		res, err := tx.ExecContext(ctx, updStmt,
 			output,
 			result.Runtime,
-			result.ExitCode,
+			// Windows error codes are signed 32-bit integers, but are
+			// returned as unsigned integers by the windows API. The
+			// software that receives them is responsible for casting
+			// it to a 32-bit signed integer.
+			// See /orbit/pkg/scripts/exec_windows.go
+			int32(result.ExitCode),
 			result.HostID,
 			result.ExecutionID,
 		)

server/datastore/mysql/scripts_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	_ "embed"
 	"fmt"
+	"math"
 	"strings"
 	"testing"
 	"time"
@@ -220,6 +221,26 @@ func testHostScriptResult(t *testing.T, ds *Datastore) {
 	pending, err = ds.ListPendingHostScriptExecutions(ctx, 1)
 	require.NoError(t, err)
 	require.Empty(t, pending, 0)
+
+	// check that scripts with large unsigned error codes get
+	// converted to signed error codes
+	createdUnsignedScript, err := ds.NewHostScriptExecutionRequest(ctx, &fleet.HostScriptRequestPayload{
+		HostID:         1,
+		ScriptContents: "echo",
+		UserID:         &u.ID,
+		SyncRequest:    true,
+	})
+	require.NoError(t, err)
+
+	unsignedScriptResult, err := ds.SetHostScriptExecutionResult(ctx, &fleet.HostScriptResultPayload{
+		HostID:      1,
+		ExecutionID: createdUnsignedScript.ExecutionID,
+		Output:      "foo",
+		Runtime:     1,
+		ExitCode:    math.MaxUint32,
+	})
+	require.NoError(t, err)
+	require.EqualValues(t, -1, *unsignedScriptResult.ExitCode)
 }
 
 func testScripts(t *testing.T, ds *Datastore) {