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[v4,07/11] kfence, kmemleak: make KFENCE compatible with KMEMLEAK

Message ID 20200929133814.2834621-8-elver@google.com (mailing list archive)
State New, archived
Headers show
Series KFENCE: A low-overhead sampling-based memory safety error detector | expand

Commit Message

Marco Elver Sept. 29, 2020, 1:38 p.m. UTC 
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.

Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Co-developed-by: Marco Elver <elver@google.com>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Alexander Potapenko <glider@google.com>
---
v2:
* Rework using delete_object_part() [suggested by Catalin Marinas].
---
 mm/kmemleak.c | 6 ++++++
 1 file changed, 6 insertions(+)
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Patch

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,