fork bomb handling and gdb support

.gitea/workflows/judge.yml

@@ -2,8 +2,6 @@ name: judge
 run-name: "Sum tests (${{ inputs.student_url || github.repository }})"
 
 on:
-  push:
-  pull_request:
   workflow_dispatch:
     inputs:
       student_url:
@@ -143,7 +141,7 @@ jobs:
           # runner auto-detects .exe suffix on Windows
           judge "$SUITE_FILE" . --json $WRAPPER_ARG > "$GITHUB_WORKSPACE/${REPORT_NAME}.json" || true
 
-          judge "$SUITE_FILE" . $WRAPPER_ARG || true
+          judge "$SUITE_FILE" . $WRAPPER_ARG
 
       - name: Upload report
         if: ${{ always() }}

runner/process_unix.go

@@ -0,0 +1,18 @@
+//go:build !windows
+
+package runner
+
+import (
+	"os/exec"
+	"syscall"
+)
+
+func setProcessGroup(cmd *exec.Cmd) {
+	cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
+}
+
+func killProcessGroup(cmd *exec.Cmd) {
+	if cmd.Process != nil {
+		syscall.Kill(-cmd.Process.Pid, syscall.SIGKILL)
+	}
+}

runner/process_windows.go

@@ -0,0 +1,20 @@
+//go:build windows
+
+package runner
+
+import (
+	"os/exec"
+	"syscall"
+)
+
+func setProcessGroup(cmd *exec.Cmd) {
+	cmd.SysProcAttr = &syscall.SysProcAttr{
+		CreationFlags: syscall.CREATE_NEW_PROCESS_GROUP,
+	}
+}
+
+func killProcessGroup(cmd *exec.Cmd) {
+	if cmd.Process != nil {
+		cmd.Process.Kill()
+	}
+}

runner/runner.go

@@ -131,6 +131,7 @@ func (r *Runner) build() (string, error) {
 
 	cmd := shellCommand(ctx, buildCmd)
 	cmd.Dir = r.cfg.WorkDir
+	setProcessGroup(cmd)
 	cmd.Env = os.Environ()
 
 	var out bytes.Buffer
@@ -138,6 +139,7 @@ func (r *Runner) build() (string, error) {
 	cmd.Stderr = &out
 
 	if err := cmd.Run(); err != nil {
+		killProcessGroup(cmd)
 		return out.String(), fmt.Errorf("build failed: %w\n%s", err, out.String())
 	}
 	return out.String(), nil
@@ -249,8 +251,13 @@ func (r *Runner) runTest(t *dsl.Test) *TestResult {
 		wrapper = t.Wrapper
 	}
 
-	cmd := buildExecCmd(ctx, wrapper, r.binary, t.Args)
+	args := t.Args
+	if wrapper != "" {
+		args = absoluteArgs(tmpDir, args)
+	}
+	cmd := buildExecCmd(ctx, wrapper, r.binary, args)
 	cmd.Dir = tmpDir
+	setProcessGroup(cmd)
 
 	cmd.Env = os.Environ()
 	cmd.Env = append(cmd.Env, "LC_ALL=C", "LANG=C")
@@ -271,6 +278,10 @@ func (r *Runner) runTest(t *dsl.Test) *TestResult {
 	runErr := cmd.Run()
 	tr.Elapsed = time.Since(start)
 
+	if ctx.Err() == context.DeadlineExceeded {
+		killProcessGroup(cmd)
+	}
+
 	tr.ActualStdout = normalizeOutput(stdout.String(), r.file)
 	tr.ActualStderr = normalizeOutput(stderr.String(), r.file)
 
@@ -327,6 +338,18 @@ func (r *Runner) runTest(t *dsl.Test) *TestResult {
 	return tr
 }
 
+func absoluteArgs(dir string, args []string) []string {
+	out := make([]string, len(args))
+	for i, a := range args {
+		if !filepath.IsAbs(a) {
+			out[i] = filepath.Join(dir, a)
+		} else {
+			out[i] = a
+		}
+	}
+	return out
+}
+
 func buildExecCmd(ctx context.Context, wrapper, binary string, args []string) *exec.Cmd {
 	if wrapper == "" {
 		return exec.CommandContext(ctx, binary, args...)