---
title: Volume mount with OS directory write permissions
description: Datadog, the leading service for cloud-scale monitoring.
breadcrumbs: >-
  Docs > Datadog Security > Code Security > Infrastructure as Code (IaC)
  Security > IaC Security Rules > Volume mount with OS directory write
  permissions
---

# Volume mount with OS directory write permissions

{% callout %}
# Important note for users on the following Datadog sites: app.ddog-gov.com, us2.ddog-gov.com

{% alert level="danger" %}
This product is not supported for your selected [Datadog site](https://docs.datadoghq.com/getting_started/site.md). ({% placeholder "user-datadog-site-name" /%}).
{% /alert %}

{% /callout %}

## Metadata{% #metadata %}

**Id:** `terraform-kubernetes-volume-mount-with-os-directory-write-permissions` 

**Provider:** Kubernetes

**Platform:** Terraform

**Severity:** High

**Category:** Resource Management

#### Learn More{% #learn-more %}

- [Provider Reference](https://registry.terraform.io/providers/hashicorp/kubernetes/latest/docs/resources/pod#volume_mount)

### Description{% #description %}

Containers can mount sensitive host folders, which may grant dangerous access to critical host configurations and binaries. This rule inspects `container` and `init_container` entries in the resource spec and evaluates each `volume_mount` (object or array) whose `mount_path` targets host-sensitive directories or `/`. The rule enforces that the `read_only` attribute is set to `true`. It reports a `MissingAttribute` if `read_only` is undefined, and an `IncorrectValue` if it is explicitly set to `false`. To remediate, add `read_only = true` when missing or replace `false` with `true` for incorrect values.

## Compliant Code Examples{% #compliant-code-examples %}

```terraform
resource "kubernetes_pod" "testttt" {
  metadata {
    name = "terraform-example"
  }

  spec {
    container {
      volume_mount {
        name       = "config-volume"
        mount_path = "/etc/config"
        read_only  = true
      }

      image = "nginx:1.7.9"
      name  = "example"

      env {
        name  = "environment"
        value = "test"
      }

      port {
        container_port = 8080
      }

      liveness_probe {
        http_get {
          path = "/nginx_status"
          port = 80

          http_header {
            name  = "X-Custom-Header"
            value = "Awesome"
          }
        }

        initial_delay_seconds = 3
        period_seconds        = 3
      }
    }

    dns_config {
      nameservers = ["1.1.1.1", "8.8.8.8", "9.9.9.9"]
      searches    = ["example.com"]

      option {
        name  = "ndots"
        value = 1
      }

      option {
        name = "use-vc"
      }
    }

    dns_policy = "None"
  }
}
```

## Non-Compliant Code Examples{% #non-compliant-code-examples %}

```terraform
resource "kubernetes_pod" "test" {
  metadata {
    name = "terraform-example"
  }

  spec {
    container {
      volume_mount {
        name       = "config-volume"
        mount_path = "/bin"
      }

      image = "nginx:1.7.9"
      name  = "example"

      env {
        name  = "environment"
        value = "test"
      }

      port {
        container_port = 8080
      }

      liveness_probe {
        http_get {
          path = "/nginx_status"
          port = 80

          http_header {
            name  = "X-Custom-Header"
            value = "Awesome"
          }
        }

        initial_delay_seconds = 3
        period_seconds        = 3
      }
    }

    dns_config {
      nameservers = ["1.1.1.1", "8.8.8.8", "9.9.9.9"]
      searches    = ["example.com"]

      option {
        name  = "ndots"
        value = 1
      }

      option {
        name = "use-vc"
      }
    }

    dns_policy = "None"
  }
}
```

```terraform
resource "kubernetes_pod" "test2" {
  metadata {
    name = "terraform-example"
  }

  spec {
    container {
      volume_mount {
        name       = "config-volume"
        mount_path = "/bin"
        read_only = false
      }

      image = "nginx:1.7.9"
      name  = "example"

      env {
        name  = "environment"
        value = "test"
      }

      port {
        container_port = 8080
      }

      liveness_probe {
        http_get {
          path = "/nginx_status"
          port = 80

          http_header {
            name  = "X-Custom-Header"
            value = "Awesome"
          }
        }

        initial_delay_seconds = 3
        period_seconds        = 3
      }
    }

    dns_config {
      nameservers = ["1.1.1.1", "8.8.8.8", "9.9.9.9"]
      searches    = ["example.com"]

      option {
        name  = "ndots"
        value = 1
      }

      option {
        name = "use-vc"
      }
    }

    dns_policy = "None"
  }
}
```

```terraform
resource "kubernetes_pod" "test3" {
  metadata {
    name = "terraform-example"
  }

  spec {
    container {
      volume_mount = [
        {
          name       = "config-volume"
          mount_path = "/bin"
          read_only = false
        }

      ]

      image = "nginx:1.7.9"
      name  = "example"

      env {
        name  = "environment"
        value = "test"
      }

      port {
        container_port = 8080
      }

      liveness_probe {
        http_get {
          path = "/nginx_status"
          port = 80

          http_header {
            name  = "X-Custom-Header"
            value = "Awesome"
          }
        }

        initial_delay_seconds = 3
        period_seconds        = 3
      }
    }

    dns_config {
      nameservers = ["1.1.1.1", "8.8.8.8", "9.9.9.9"]
      searches    = ["example.com"]

      option {
        name  = "ndots"
        value = 1
      }

      option {
        name = "use-vc"
      }
    }

    dns_policy = "None"
  }
}
```