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add initialization of tamper detection #256
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abarisani
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| // Copyright 2024 The Armored Witness OS authors. All Rights Reserved. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
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| //go:build tamper | ||
| // +build tamper | ||
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| package main | ||
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| import ( | ||
| "runtime" | ||
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| "github.com/usbarmory/tamago/soc/nxp/caam" | ||
| "github.com/usbarmory/tamago/soc/nxp/imx6ul" | ||
| "github.com/usbarmory/tamago/soc/nxp/snvs" | ||
| ) | ||
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| // enableTamperDetection configures strict SNVS tamper detection policy with | ||
| // immediate hard fail on security violations | ||
| func enableTamperDetection() { | ||
| sp := snvs.SecurityPolicy{ | ||
| Clock: true, | ||
| Temperature: true, | ||
| Voltage: true, | ||
| SecurityViolation: true, | ||
| HardFail: true, | ||
| HAC: 0, | ||
| } | ||
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| imx6ul.SNVS.SetPolicy(sp) | ||
| } | ||
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| // enableTextRTIC starts CAAM integrity monitor on the Go runtime memory region | ||
| func enableTextRTIC() (err error) { | ||
| var blocks []caam.MemoryBlock | ||
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| textStart, textEnd := runtime.TextRegion() | ||
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| blocks = append(blocks, caam.MemoryBlock{ | ||
| Address: textStart, | ||
| Length: textEnd - textStart, | ||
| }) | ||
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| return imx6ul.CAAM.EnableRTIC(blocks) | ||
| } | ||
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| func init() { | ||
| if imx6ul.Native && imx6ul.SNVS.Available() { | ||
| enableTamperDetection() | ||
| } | ||
|
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| if imx6ul.CAAM != nil { | ||
| _ = enableTextRTIC() | ||
| } | ||
| } |
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This is unnecessary on secure booted units and irrelevant on open ones, nonetheless it's good practice to invoke it as an abundance of caution given its null cost.