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Subject[PATCH RFC 07/10] kfence, kmemleak: make KFENCE compatible with KMEMLEAK
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From: Alexander Potapenko <glider@google.com>

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.

Co-developed-by: Marco Elver <elver@google.com>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Alexander Potapenko <glider@google.com>
---
mm/kmemleak.c | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index 5e252d91eb14..2809c25c0a88 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>

@@ -1946,8 +1947,18 @@ void __init kmemleak_init(void)
/* register the data/bss sections */
create_object((unsigned long)_sdata, _edata - _sdata,
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. */
+ create_object((unsigned long)__bss_start, __kfence_pool - __bss_start,
+ KMEMLEAK_GREY, GFP_ATOMIC);
+ create_object((unsigned long)__kfence_pool + KFENCE_POOL_SIZE,
+ __bss_stop - (__kfence_pool + KFENCE_POOL_SIZE),
+ KMEMLEAK_GREY, GFP_ATOMIC);
+#else
create_object((unsigned long)__bss_start, __bss_stop - __bss_start,
KMEMLEAK_GREY, GFP_ATOMIC);
+#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,
--
2.28.0.526.ge36021eeef-goog
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