From: Alexander Potapenko <glider@xxxxxxxxxx> Add compatibility with KMEMLEAK, by making KMEMLEAK aware of the KFENCE memory pool. This allows building debug kernels with both enabled, which also helped in debugging KFENCE. Reviewed-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Co-developed-by: Marco Elver <elver@xxxxxxxxxx> Signed-off-by: Marco Elver <elver@xxxxxxxxxx> Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx> --- v2: * Rework using delete_object_part() [suggested by Catalin Marinas]. --- mm/kmemleak.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/kmemleak.c b/mm/kmemleak.c index 5e252d91eb14..feff16068e8e 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -97,6 +97,7 @@ #include <linux/atomic.h> #include <linux/kasan.h> +#include <linux/kfence.h> #include <linux/kmemleak.h> #include <linux/memory_hotplug.h> @@ -1948,6 +1949,11 @@ void __init kmemleak_init(void) KMEMLEAK_GREY, GFP_ATOMIC); create_object((unsigned long)__bss_start, __bss_stop - __bss_start, KMEMLEAK_GREY, GFP_ATOMIC); +#if defined(CONFIG_KFENCE) && defined(CONFIG_HAVE_ARCH_KFENCE_STATIC_POOL) + /* KFENCE objects are located in .bss, which may confuse kmemleak. Skip them. */ + delete_object_part((unsigned long)__kfence_pool, KFENCE_POOL_SIZE); +#endif + /* only register .data..ro_after_init if not within .data */ if (&__start_ro_after_init < &_sdata || &__end_ro_after_init > &_edata) create_object((unsigned long)__start_ro_after_init, -- 2.28.0.681.g6f77f65b4e-goog
