What the developer wrote
Authored by 0xApprentice
fix ada crash
What changed, and why it matters
This commit increases the memory stack size for a task that handles sensitive data, with the stated goal of fixing a crash related to Cardano (ADA). A too-small stack can cause memory corruption or a device crash when handling certain operations. While the change itself is defensive, the crash occurs in a security-sensitive task, so it could theoretically affect availability or stability during sensitive operations. There is no direct evidence in the commit that this is exploitable for theft or key extraction.
Treat this as a reliability and potential safety fix. Users should update to firmware containing this commit. The vendor should additionally verify that the new stack size covers worst-case Cardano operations, consider enabling stack overflow detection or guard zones, and review whether other tasks handling sensitive data have adequate stack margins. Independent security review of the Cardano code path is advisable because crashes in sensitive tasks can sometimes mask deeper memory safety issues.
Security signals we found
Stack size increase in a task explicitly named for handling sensitive data
Crash fix in code path related to cryptocurrency signing (Cardano/ADA)
Potential stack overflow risk in embedded firmware task
No additional hardening, input validation, or stack guard changes included
Evidence from the diff
The patch changes the FreeRTOS stack allocation for CreateFetchSensitiveDataTask from 35 KB to 40 KB (102435 to 102440). The task name implies it is responsible for retrieving sensitive material such as seed phrases or private keys. The commit message says this fixes an ADA (Cardano) crash, suggesting that Cardano-related operations were exhausting the previous stack and causing a stack overflow. Stack overflows in embedded firmware can lead to hard faults, memory corruption, or undefined behavior. The fix is straightforward but partial in terms of evidence: it does not show root cause analysis, bounds checking, or whether the increased size is sufficient for all future cases.
Changed components
src/tasks/fetch_sensitive_data_task.cFreeRTOS task stack allocation for sensitive-data fetchingCardano (ADA) transaction or key handling flowInspect captured patch +1 / −1
diff --git a/src/tasks/fetch_sensitive_data_task.c b/src/tasks/fetch_sensitive_data_task.c
index 5dea6d1..ec6c758 100644
--- a/src/tasks/fetch_sensitive_data_task.c
+++ b/src/tasks/fetch_sensitive_data_task.c
@@ -28,7 +28,7 @@ void CreateFetchSensitiveDataTask(void)
#ifdef CYPHERPUNK_VERSION
.stack_size = 1024 * 44,
#else
- .stack_size = 1024 * 35,
+ .stack_size = 1024 * 40,
#endif
.priority = (osPriority_t)osPriorityBelowNormal,
};
Why this scored 35/100
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