diff --git a/cmd/runtimetest/main.go b/cmd/runtimetest/main.go
index 5e38e44f7..32a6eca74 100644
--- a/cmd/runtimetest/main.go
+++ b/cmd/runtimetest/main.go
@@ -81,38 +81,11 @@ func loadSpecConfig(path string) (spec *rspec.Spec, err error) {
 	return spec, nil
 }
 
-// should be included by other platform specified process validation
-func validateGeneralProcess(spec *rspec.Spec) error {
-	if spec.Process.Cwd != "" {
-		cwd, err := os.Getwd()
-		if err != nil {
-			return err
-		}
-		if cwd != spec.Process.Cwd {
-			return fmt.Errorf("Cwd expected: %v, actual: %v", spec.Process.Cwd, cwd)
-		}
-	}
-
-	for _, env := range spec.Process.Env {
-		parts := strings.Split(env, "=")
-		key := parts[0]
-		expectedValue := parts[1]
-		actualValue := os.Getenv(key)
-		if actualValue != expectedValue {
-			return fmt.Errorf("Env %v expected: %v, actual: %v", key, expectedValue, actualValue)
-		}
-	}
-
-	return nil
-}
-
-func validateLinuxProcess(spec *rspec.Spec) error {
+func validatePosixUser(spec *rspec.Spec) error {
 	if spec.Process == nil {
 		return nil
 	}
 
-	validateGeneralProcess(spec)
-
 	uid := os.Getuid()
 	if uint32(uid) != spec.Process.User.UID {
 		return fmt.Errorf("UID expected: %v, actual: %v", spec.Process.User.UID, uid)
@@ -138,6 +111,38 @@ func validateLinuxProcess(spec *rspec.Spec) error {
 		}
 	}
 
+	return nil
+}
+
+func validateProcess(spec *rspec.Spec) error {
+	if spec.Process.Cwd != "" {
+		cwd, err := os.Getwd()
+		if err != nil {
+			return err
+		}
+		if cwd != spec.Process.Cwd {
+			return fmt.Errorf("Cwd expected: %v, actual: %v", spec.Process.Cwd, cwd)
+		}
+	}
+
+	for _, env := range spec.Process.Env {
+		parts := strings.Split(env, "=")
+		key := parts[0]
+		expectedValue := parts[1]
+		actualValue := os.Getenv(key)
+		if actualValue != expectedValue {
+			return fmt.Errorf("Env %v expected: %v, actual: %v", key, expectedValue, actualValue)
+		}
+	}
+
+	return nil
+}
+
+func validateLinuxProcess(spec *rspec.Spec) error {
+	if spec.Process == nil {
+		return nil
+	}
+
 	cmdlineBytes, err := ioutil.ReadFile("/proc/self/cmdline")
 	if err != nil {
 		return err
@@ -267,10 +272,6 @@ func validateHostname(spec *rspec.Spec) error {
 }
 
 func validateRlimits(spec *rspec.Spec) error {
-	if runtime.GOOS == "windows" {
-		return nil
-	}
-
 	if spec.Process == nil {
 		return nil
 	}
@@ -632,12 +633,7 @@ func mountMatch(configMount rspec.Mount, sysMount *mount.Info) error {
 	return nil
 }
 
-func validateMounts(spec *rspec.Spec) error {
-	if runtime.GOOS == "windows" {
-		logrus.Warnf("mounts validation not yet implemented for OS %q", runtime.GOOS)
-		return nil
-	}
-
+func validatePosixMounts(spec *rspec.Spec) error {
 	mountInfos, err := mount.GetMounts()
 	if err != nil {
 		return err
@@ -730,9 +726,20 @@ func run(context *cli.Context) error {
 			description: "hostname",
 		},
 		{
-			test:        validateMounts,
+			test:        validateProcess,
+			description: "process",
+		},
+	}
+
+	posixValidations := []validation{
+		{
+			test:        validatePosixMounts,
 			description: "mounts",
 		},
+		{
+			test:        validatePosixUser,
+			description: "user",
+		},
 		{
 			test:        validateRlimits,
 			description: "rlimits",
@@ -811,6 +818,19 @@ func run(context *cli.Context) error {
 		}
 	}
 
+	if platform == "linux" || platform == "solaris" {
+		for _, v := range posixValidations {
+			err := v.test(spec)
+			t.Ok(err == nil, v.description)
+			if err != nil {
+				if e, ok := err.(*specerror.Error); ok && e.Err.Level < complianceLevel {
+					continue
+				}
+				validationErrors = multierror.Append(validationErrors, err)
+			}
+		}
+	}
+
 	if platform == "linux" {
 		for _, v := range linuxValidations {
 			err := v.test(spec)