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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →grsecurity, SELinux and AppArmor are not interchangeable security products. SELinux and AppArmor are mandatory access control (MAC) systems built around Linux Security Modules (LSM); grsecurity is a vendor-maintained kernel-hardening offering that also includes its own access-control system. Choose based on whether your main need is controlling what processes can access, reducing kernel exploit risk, or both—then check policy coverage, kernel and distribution fit, and the maintenance commitment.
What each option is designed to do
Linux security has several layers that address different failure modes. Discretionary access control (DAC), including ordinary Unix ownership and permissions, is the baseline. MAC adds centrally enforced policy that can restrict access beyond DAC. Kernel self-protection is a separate layer: it aims to make flaws in the kernel harder to exploit or easier to detect.
The Linux kernel documentation describes LSM as the framework that lets security checks be hooked by kernel extensions. It lists SELinux and AppArmor among MAC extensions. The framework is not itself a policy system, and having an LSM-capable kernel does not tell you which policies are active or which programs they cover.
| Option | Primary role | How access control is expressed | Key operational question |
|---|---|---|---|
| grsecurity | Vendor-described kernel hardening plus access control, including memory-corruption defenses, filesystem protections and RBAC. | Its own RBAC system; details and available features depend on the supported kernel and deployment. | Does the supported kernel, configuration, architecture and vendor support fit your environment? |
| SELinux | MAC enforcement through the kernel. | Policy rules govern access using labels on processes and resources, object classes and permissions. | Can your team maintain the distribution’s policy, labels and operational workflows? |
| AppArmor | MAC enforcement through the kernel. | Profiles associated with tasks define permitted behavior. | Which relevant workloads actually have profiles loaded and enforced? |
The descriptions of grsecurity’s feature set are claims made by the vendor, not an independent evaluation of effectiveness. SELinux and AppArmor documentation establishes their mechanisms, not that either is universally more secure.
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Why kernel hardening and MAC are different controls
MAC answers questions such as whether a process may read a file, use a capability or interact with a particular resource. Kernel self-protection addresses flaws and attacks against the kernel itself. The Linux kernel documentation defines kernel self-protection as designing and implementing systems and structures to protect against security flaws in the kernel, including removing bug classes, blocking exploitation methods and detecting attacks.
A strict policy can limit what a compromised application can reach, but it does not by itself demonstrate that kernel memory-corruption exploitation is mitigated. Conversely, kernel hardening does not replace a carefully scoped policy for applications and services. Treat the layers as complementary only after verifying the actual kernel build, selected LSMs, distribution integration and workload compatibility.
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How SELinux and AppArmor differ in practice
SELinux: labeled subjects and resources
SELinux policy evaluates access using labels associated with a subject, commonly a process, and a target resource, together with the resource’s class and requested permissions. Policy determines what is allowed; Red Hat’s policy-writing documentation describes requests not allowed by policy as denied by default. That is a conceptual description, not a guarantee that every distribution ships the same policy, labels or defaults.
This model can express system-wide relationships between process domains and labeled objects. Its practical burden is understanding the policy and keeping labels and rules aligned with how the system is managed. On Red Hat systems, Red Hat documents Ansible system-role workflows for tasks including modes, contexts, booleans, logins, ports and policy modules. Those workflows are distribution-specific; do not assume their commands or defaults apply unchanged elsewhere.
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AppArmor: task-centered profiles
AppArmor associates profiles with tasks. According to the kernel documentation, a task with no defined profile runs unconfined, with the ordinary DAC permissions; profiles must be loaded from userspace for AppArmor to impose restrictions beyond DAC. As a result, an enabled AppArmor service or an installed package is not proof that every important application is confined.
For an AppArmor deployment, inventory the profiles relevant to your services, confirm they are loaded and in the intended enforcement state, and identify important tasks that remain unprofiled. Profile creation and upkeep are part of the security control, not optional housekeeping.
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What grsecurity adds—and what its comparison does not prove
grsecurity’s vendor material describes a broader package than a MAC policy alone: it advertises memory-corruption defenses, filesystem hardening, other kernel protections, RBAC, GCC plugins and container isolation. The vendor also says grsecurity can work with SELinux, AppArmor or another LSM. That is not a blanket compatibility guarantee: validate the exact kernel, selected LSMs, architecture, distribution integration and workload.
The vendor’s grsecurity-versus-LSM comparison matrix is dated July 5, 2018. It is useful as a statement of the vendor’s position, not as a current neutral feature audit or independent head-to-head test. The available material does not establish comparative attack-prevention rates, performance overhead or a universal security ranking.
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Kernel and distribution support are part of the decision
LSM selection and behavior depend on the kernel and distribution. The kernel documentation says major MAC extensions are selected through kernel configuration, with boot-time override possible when multiple modules are built in. The active LSM list can be checked at /sys/kernel/security/lsm. This is why an LSM is not always installed like a conventional loadable kernel module: build options, boot configuration and distribution defaults matter. Check the documentation for the kernel you actually deploy.
SELinux and AppArmor are integrated and configured differently across distributions; policy tooling and defaults are not interchangeable. For grsecurity, the support details are time-sensitive and vendor-published. The grsecurity FAQ dated January 27, 2026 listed support for Linux 6.6 and 6.18, with stated minimum support through the end of 2026 and end of 2028, respectively. The vendor homepage, accessed October 4, 2026, showed point releases 6.6.157 and 6.18.54, each updated September 30, 2026. These figures describe the vendor’s published status at those dates, not a guarantee of later branch availability or support for every architecture and configuration.
Choose by threat model and operational capacity
When SELinux is a strong fit
- You need policy based on labeled processes and resources, and the distribution’s SELinux policy and administration tools fit your fleet.
- Your team can manage policy, labels and denials as part of configuration and change management.
- You want to use supported, distribution-specific automation where available, while keeping playbooks aligned with that distribution.
When AppArmor is a strong fit
- Task-centered profiles fit the way you want to scope application behavior.
- Your team can build or maintain profiles and verify that important tasks are actually confined.
- You are prepared to treat unprofiled tasks as outside AppArmor confinement rather than assuming system-wide coverage.
When to evaluate grsecurity
- Your threat model calls for kernel hardening measures in addition to access-control policy.
- The vendor’s supported kernel branches, architecture, integration requirements and support arrangements fit your deployment and maintenance horizon.
- You can validate the vendor-described protections and compatibility in the exact environment you intend to run.
These options need not be treated as exclusive categories: the grsecurity vendor says its offering can work with SELinux or AppArmor. Whether a particular combination is supported and behaves correctly is a deployment-specific question.
A practical evaluation and rollout
- Define the risk you are reducing. Separate concerns such as excessive application access, an exposed service, container isolation and kernel exploitation. Map each to the control that addresses it rather than treating “hardening” as a single feature.
- Inventory the target fleet. Record distribution, kernel version and configuration, architecture, boot settings, current LSM selection, required applications and existing security tooling. For an LSM-based design, inspect the target system’s active LSM list at
/sys/kernel/security/lsmand consult its kernel and distribution documentation. - Measure policy coverage. For SELinux, review the applicable policy, labels and operational handling of denials. For AppArmor, list the profiles loaded and enforced for the services that matter and find unprofiled tasks. Do not count installation or enablement alone as coverage.
- Check maintenance ownership. Identify who will update policy, test application changes, investigate denials and maintain kernel integrations. For grsecurity, confirm current supported branches and support terms directly with the vendor before committing to a lifecycle.
- Test representative workloads before broad rollout. Exercise normal operations, upgrades, recovery and security-relevant edge cases in a staging environment. Confirm expected access remains possible and unintended access is constrained; document exceptions and their owners.
- Deploy in controlled stages and monitor. Roll out to a limited group, review policy and system logs using the distribution’s supported tools, and keep a tested recovery path for misconfiguration. Expand only when operational services and policy coverage meet the deployment’s requirements.
Bottom line: there is no universal winner
Choose SELinux or AppArmor when the central requirement is a MAC policy and the model, distribution integration and team expertise line up. Evaluate grsecurity when you also need its vendor-described kernel-hardening capabilities and can support its kernel and maintenance path. A sound comparison is about the protections you will actually configure, the workloads they cover and the updates you can sustain—not a generic ranking of names.
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