Trust.Zone Blog. Beiträge am Tag 'blackfriday-2024'

Q: Does TrustZone support AXI bus access?

All TrustZone compatible devices will tag AXI Bus access with an NS bit. This bit specifies whether the access is from a secure or normal world. In this way, even DMA peripherals under the control of the normal world can be isolated. Is there any relationship between the 7 operating modes of ARM and the Secure / Non-Secure Worlds. Not really.

Q: What is the difference between TrustZone a and TrustZone-M processors?

Trustzone-A also has a so-called Security Monitor, which is the sole entry point into secure world. Trustzone-M processors can have many entry points, which are placed in a dedicated region, called non-secure callable region. Terms explained in this chapter:

Q: What is a Trustzone-aware MMU?

Besides the physical memory partition, a TrustZone-aware MMU enables both worlds with distinct translation tables and with a tag in TLB to identify the world to avoid flushing TLB when switching world.

Q: Is TrustZone a good virtualization solution?

When regarded as a virtualization solution, TrustZone is severely lacking: The number of virtual machines is limited to two, one running in the secure world and one running in the non-secure world. The trap-and-execute model for emulating devices is not possible because security violation abort is always asynchronous.

Q: Is ARM TrustZone a virtualization solution?

As many researchers proposed, ARM TrustZone can be viewed from two angles, as virtualization solution and as mechanism to implement functionality similar to Trusted Platform Modules (TPM). When regarded as a virtualization solution, TrustZone is severely lacking:

Q: What happens if you disable MMU in TrustZone?

The MMU is not involved with TrustZone at all. So disabling the MMU accomplishes nothing. Possible attacks are against the monitor code, the secure OS API (to the normal world), bus protection, boot code or hardware. The MMU with security extensions is to allow secure world code to access memory as per the normal world and fault accordingly.

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FAQs about Trust.Zone Blog. Beiträge am Tag 'blackfriday-2024' Coupon?

Does TrustZone support AXI bus access?

All TrustZone compatible devices will tag AXI Bus access with an NS bit. This bit specifies whether the access is from a secure or normal world. In this way, even DMA peripherals under the control of the normal world can be isolated. Is there any relationship between the 7 operating modes of ARM and the Secure / Non-Secure Worlds. Not really. ...

What is the difference between TrustZone a and TrustZone-M processors?

Trustzone-A also has a so-called Security Monitor, which is the sole entry point into secure world. Trustzone-M processors can have many entry points, which are placed in a dedicated region, called non-secure callable region. Terms explained in this chapter: ...

What is a Trustzone-aware MMU?

Besides the physical memory partition, a TrustZone-aware MMU enables both worlds with distinct translation tables and with a tag in TLB to identify the world to avoid flushing TLB when switching world. ...

Is TrustZone a good virtualization solution?

When regarded as a virtualization solution, TrustZone is severely lacking: The number of virtual machines is limited to two, one running in the secure world and one running in the non-secure world. The trap-and-execute model for emulating devices is not possible because security violation abort is always asynchronous. ...

Is ARM TrustZone a virtualization solution?

As many researchers proposed, ARM TrustZone can be viewed from two angles, as virtualization solution and as mechanism to implement functionality similar to Trusted Platform Modules (TPM). When regarded as a virtualization solution, TrustZone is severely lacking: ...

What happens if you disable MMU in TrustZone?

The MMU is not involved with TrustZone at all. So disabling the MMU accomplishes nothing. Possible attacks are against the monitor code, the secure OS API (to the normal world), bus protection, boot code or hardware. The MMU with security extensions is to allow secure world code to access memory as per the normal world and fault accordingly. ...