Re: [PR] arm64: Implement dynamic MPU-based memory protection for stack and heap on Armv8-R AArch64 [nuttx]

Thu, 29 Jan 2026 05:17:46 -0800 


hujun260 commented on PR #18185:
URL: https://github.com/apache/nuttx/pull/18185#issuecomment-3817643794

   > > > > test log provided
   > > > 
   > > > 
   > > > Please provide the test log for both the architectures you tested on, 
and include the full test output.
   > > > Also, your change says:
   > > > > ```
   > > > > Enables CONFIG_MM_TASK_HEAP mode for per-task heap isolation
   > > > > Implements mpu_update() function to dynamically configure heap MPU 
regions
   > > > > Creates isolated heap regions with user read/write permissions
   > > > > Surrounds heap with kernel-only background regions for access control
   > > > > ```
   > > > 
   > > > 
   > > > Since your change includes new logic, it will not be adequately tested 
by OS test. Can you please provide some information about the test cases you 
used to verify that the new features work correctly, and include log output 
from them?
   > > 
   > > 
   > > The key point of this feature is that, in protection mode, the stacks 
and heaps of different threads can be isolated. You can refer to the code 
below; one thread cannot access the stack of another thread. <img alt="image" 
width="802" height="542" 
src="https://private-user-images.githubusercontent.com/128452594/542201408-58280c1c-f7f9-484e-a136-9dea507e40d0.png?jwt=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3Njk2OTE5MDEsIm5iZiI6MTc2OTY5MTYwMSwicGF0aCI6Ii8xMjg0NTI1OTQvNTQyMjAxNDA4LTU4MjgwYzFjLWY3ZjktNDg0ZS1hMTM2LTlkZWE1MDdlNDBkMC5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjYwMTI5JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI2MDEyOVQxMzAwMDFaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT0zYzE2ZGMwMzU2MmU3MzQyOTM5OGMyOTFkMjg5MTJlNGQ0OTc2OGEyYjE2OGY2YzlmNGViMzUxMmIyN2ZkN2Q0JlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.t1
 _K5Tml46NJh3CCR_uePvdkImixyinbG-qxBnySajE">
   > > <img alt="image" width="1500" height="685" 
src="https://private-user-images.githubusercontent.com/128452594/542200841-9f09c237-3eeb-4539-9912-66ef23d9a1a6.png?jwt=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3Njk2OTE5MDEsIm5iZiI6MTc2OTY5MTYwMSwicGF0aCI6Ii8xMjg0NTI1OTQvNTQyMjAwODQxLTlmMDljMjM3LTNlZWItNDUzOS05OTEyLTY2ZWYyM2Q5YTFhNi5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjYwMTI5JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI2MDEyOVQxMzAwMDFaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT1lNTgwYWI3ZDRjNGFlZTU4YjNiYzcxZThhOTlhYTM3MDcxMTRmOTk1ZDI2MmQ1ZDBhYzQ3YzY0NTMyZTgxNmUxJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.YuUvWpdoFVv_CkNNcRBHolGy37L1-RKe_UVm-5DbDhE";>
   > 
   > @hujun260 please create a apps/testing with this sample code to be used to 
valid MPU protection. Is there some way to catch this exception and avoid 
throwing the dump to user?
   
   Currently, an access anomaly has occurred and is not being handled 
correctly, preventing the subsequent program from executing normally. We are 
currently working on implementing this functionality.


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