From: Alexander Popov <alex.popov@linux.com>
To: Kees Cook <keescook@chromium.org>, Jann Horn <jannh@google.com>,
Will Deacon <will@kernel.org>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Alexander Potapenko <glider@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
Christoph Lameter <cl@linux.com>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
Masahiro Yamada <masahiroy@kernel.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Peter Zijlstra <peterz@infradead.org>,
Krzysztof Kozlowski <krzk@kernel.org>,
Patrick Bellasi <patrick.bellasi@arm.com>,
David Howells <dhowells@redhat.com>,
Eric Biederman <ebiederm@xmission.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Laura Abbott <labbott@redhat.com>, Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Daniel Micay <danielmicay@gmail.com>,
Andrey Konovalov <andreyknvl@google.com>,
Matthew Wilcox <willy@infradead.org>,
Pavel Machek <pavel@denx.de>,
Valentin Schneider <valentin.schneider@arm.com>,
kasan-dev@googlegroups.com, linux-mm@kvack.org,
kernel-hardening@lists.openwall.com,
linux-kernel@vger.kernel.org,
Alexander Popov <alex.popov@linux.com>
Cc: notify@kernel.org
Subject: [PATCH RFC v2 6/6] mm: Add heap quarantine verbose debugging (not for merge)
Date: Tue, 29 Sep 2020 21:35:13 +0300 [thread overview]
Message-ID: <20200929183513.380760-7-alex.popov@linux.com> (raw)
In-Reply-To: <20200929183513.380760-1-alex.popov@linux.com>
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@linux.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
next prev parent reply other threads:[~2020-09-29 18:37 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-29 18:35 [PATCH RFC v2 0/6] Break heap spraying needed for exploiting use-after-free Alexander Popov
2020-09-29 18:35 ` [PATCH RFC v2 1/6] mm: Extract SLAB_QUARANTINE from KASAN Alexander Popov
2020-09-29 18:35 ` [PATCH RFC v2 2/6] mm/slab: Perform init_on_free earlier Alexander Popov
2020-09-30 12:50 ` Alexander Potapenko
2020-10-01 19:48 ` Alexander Popov
2020-12-03 19:50 ` Alexander Popov
2020-12-03 20:49 ` Andrew Morton
2020-12-04 11:54 ` Alexander Popov
2020-09-29 18:35 ` [PATCH RFC v2 3/6] mm: Integrate SLAB_QUARANTINE with init_on_free Alexander Popov
2020-09-29 18:35 ` [PATCH RFC v2 4/6] mm: Implement slab quarantine randomization Alexander Popov
2020-09-29 18:35 ` [PATCH RFC v2 5/6] lkdtm: Add heap quarantine tests Alexander Popov
2020-09-29 18:35 ` Alexander Popov [this message]
2020-10-01 19:42 ` [PATCH RFC v2 0/6] Break heap spraying needed for exploiting use-after-free Alexander Popov
2020-10-05 22:56 ` Jann Horn
2020-10-06 0:44 ` Matthew Wilcox
2020-10-06 0:48 ` Jann Horn
2020-10-06 2:09 ` Kees Cook
2020-10-06 2:16 ` Jann Horn
2020-10-06 2:19 ` Daniel Micay
2020-10-06 8:35 ` Christopher Lameter
2020-10-06 8:32 ` Christopher Lameter
2020-10-06 17:56 ` Alexander Popov
2020-10-06 18:37 ` Jann Horn
2020-10-06 19:25 ` Alexander Popov
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