esp-idf/tools/test_apps/system/kasan_test/sdkconfig.defaults at 0cd01c19bbeff2ca8e5758e2f439e4e1e240ec9e - esp-idf - chatchai: gitea

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Meet Patel 383e9adb82 feat(kasan): add Kernel Address Sanitizer (KASAN) support for ESP-IDF

Add KASAN support for detecting heap memory safety bugs (buffer
overflows, underflows, use-after-free) at runtime using compiler
instrumentation and shadow memory. Gated behind
CONFIG_IDF_EXPERIMENTAL_FEATURES, with touch points kept to esp_system
and heap so other components stay untouched.

- Core runtime (esp_system/kasan.c, esp_kasan.h): nibble-based shadow
  memory in DRAM, poison/unpoison, per-access validation, and __asan_*
  stubs; hot-path stubs in IRAM so they stay valid with the flash cache
  off. Shadow init runs before heap bring-up.
- Heap integration (heap/heap_kasan*.c): alloc/free hooks add redzones,
  a quarantine FIFO, and shadow updates.
- Panic handling: disable checks once at the panic handler entry so
  backtrace and stack dumps can read redzones without nested reports.
- Build system: -fsanitize=kernel-address for app code, with HAL, SoC,
  esp_rom, SPI flash, esp_hw_support, bootloader_support, FreeRTOS, and
  heap internals excluded from instrumentation.
- Test app (tools/test_apps/system/kasan_test): Unity tests for
  overflow, underflow, use-after-free, and all sized __asan_* stubs,
  with halt and no-halt configurations.
- Docs: document KASAN in the heap memory debugging guide (EN and CN).

2026-06-24 11:27:00 +05:30

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 # Minimal KASAN enablement — everything else stays at Kconfig defaults
 # (redzone=8, quarantine=8192, heap poisoning=disabled, HEAP_USE_HOOKS selected).
 CONFIG_IDF_EXPERIMENTAL_FEATURES=y
 CONFIG_COMPILER_KASAN=y
 CONFIG_ESP_TASK_WDT_EN=n