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tests: stackprot: add guard area to ensure portable overflow behavior #95071

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tests: stackprot: add guard area to ensure portable overflow behavior #95071

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7 changes: 7 additions & 0 deletions tests/kernel/mem_protect/stackprot/src/main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,13 @@ void alternate_thread(void *p1, void *p2, void *p3)
ARG_UNUSED(p1);
ARG_UNUSED(p2);
ARG_UNUSED(p3);
/*
* Padding buffer to absorb the intentional overflow inside the thread stack.
* This prevents writes from crossing the thread stack boundary into the next
* MPU-protected region. Required to make the test independent of compiler-
* specific stack frame layouts.
*/
volatile char overflow_guard_area[32] = "Forcing Initialization!";

TC_PRINT("Starts %s\n", __func__);
check_input(__func__,
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