tests: stackprot: add guard area to ensure portable overflow behavior #95071
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The stackprot test currently depends on compiler-generated stack frame layouts, which can vary between toolchains and optimization levels. This makes the overflow check fragile and may cause unintended faults. Add a small guard buffer in alternate_thread so the intentional overflow is always contained within the thread stack. This ensures the test behaves consistently across toolchains, architectures, and optimization settings. Signed-off-by: Mohamed Moawad <[email protected]>
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The stackprot test currently depends on compiler-generated stack frame layouts, which can vary between toolchains and optimization levels. This makes the overflow check fragile and may cause unintended faults.
Add a small guard buffer in alternate_thread so the intentional overflow is always contained within the thread stack. This ensures the test behaves consistently across toolchains, architectures, and optimization settings.
Fixes: #95060