linux-kernel - [PATCH RFC v2 6/6] mm: Add heap quarantine verbose debugging (not for merge)

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Date:   Tue, 29 Sep 2020 21:35:13 +0300
From:   Alexander Popov <alex.popov@...ux.com>
To:     Kees Cook <keescook@...omium.org>, Jann Horn <jannh@...gle.com>,
        Will Deacon <will@...nel.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Patrick Bellasi <patrick.bellasi@....com>,
        David Howells <dhowells@...hat.com>,
        Eric Biederman <ebiederm@...ssion.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Laura Abbott <labbott@...hat.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Daniel Micay <danielmicay@...il.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        Pavel Machek <pavel@...x.de>,
        Valentin Schneider <valentin.schneider@....com>,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        kernel-hardening@...ts.openwall.com, linux-kernel@...r.kernel.org,
        Alexander Popov <alex.popov@...ux.com>
Cc:     notify@...nel.org
Subject: [PATCH RFC v2 6/6] mm: Add heap quarantine verbose debugging (not for merge)

Add verbose debugging for deeper understanding of the heap quarantine
inner workings (this patch is not for merge).

Signed-off-by: Alexander Popov <alex.popov@...ux.com>
---
 mm/kasan/quarantine.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c
index 4ce100605086..98cd6e963755 100644
--- a/mm/kasan/quarantine.c
+++ b/mm/kasan/quarantine.c
@@ -203,6 +203,12 @@ void quarantine_put(struct kasan_free_meta *info, struct kmem_cache *cache)
 		qlist_move_all(q, &temp);
 
 		raw_spin_lock(&quarantine_lock);
+
+		pr_info("quarantine: PUT %zu to tail batch %d, whole sz %zu, batch sz %lu\n",
+				temp.bytes, quarantine_tail,
+				READ_ONCE(quarantine_size),
+				READ_ONCE(quarantine_batch_size));
+
 		WRITE_ONCE(quarantine_size, quarantine_size + temp.bytes);
 		qlist_move_all(&temp, &global_quarantine[quarantine_tail]);
 		if (global_quarantine[quarantine_tail].bytes >=
@@ -313,7 +319,22 @@ void quarantine_reduce(void)
 			quarantine_head = get_random_int() % QUARANTINE_BATCHES;
 		} while (quarantine_head == quarantine_tail);
 		qlist_move_random(&global_quarantine[quarantine_head], &to_free);
+		pr_info("quarantine: whole sz exceed max by %lu, REDUCE head batch %d by %zu, leave %zu\n",
+				quarantine_size - quarantine_max_size,
+				quarantine_head, to_free.bytes,
+				global_quarantine[quarantine_head].bytes);
 		WRITE_ONCE(quarantine_size, quarantine_size - to_free.bytes);
+
+		if (quarantine_head == 0) {
+			unsigned long i;
+
+			pr_info("quarantine: data level in batches:");
+			for (i = 0; i < QUARANTINE_BATCHES; i++) {
+				pr_info("  %lu - %lu%%\n",
+					i, global_quarantine[i].bytes *
+						100 / quarantine_batch_size);
+			}
+		}
 	}
 #endif
 
-- 
2.26.2