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>,
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 2/2] lkdtm: Add heap spraying test
Date: Thu, 13 Aug 2020 18:19:22 +0300 [thread overview]
Message-ID: <20200813151922.1093791-3-alex.popov@linux.com> (raw)
In-Reply-To: <20200813151922.1093791-1-alex.popov@linux.com>
Add a simple test for CONFIG_SLAB_QUARANTINE.
It performs heap spraying that aims to reallocate the recently freed heap
object. This technique is used for exploiting use-after-free
vulnerabilities in the kernel code.
This test shows that CONFIG_SLAB_QUARANTINE breaks heap spraying
exploitation technique.
Signed-off-by: Alexander Popov <alex.popov@linux.com>
---
drivers/misc/lkdtm/core.c | 1 +
drivers/misc/lkdtm/heap.c | 40 ++++++++++++++++++++++++++++++++++++++
drivers/misc/lkdtm/lkdtm.h | 1 +
3 files changed, 42 insertions(+)
diff --git a/drivers/misc/lkdtm/core.c b/drivers/misc/lkdtm/core.c
index a5e344df9166..78b7669c35eb 100644
--- a/drivers/misc/lkdtm/core.c
+++ b/drivers/misc/lkdtm/core.c
@@ -126,6 +126,7 @@ static const struct crashtype crashtypes[] = {
CRASHTYPE(SLAB_FREE_DOUBLE),
CRASHTYPE(SLAB_FREE_CROSS),
CRASHTYPE(SLAB_FREE_PAGE),
+ CRASHTYPE(HEAP_SPRAY),
CRASHTYPE(SOFTLOCKUP),
CRASHTYPE(HARDLOCKUP),
CRASHTYPE(SPINLOCKUP),
diff --git a/drivers/misc/lkdtm/heap.c b/drivers/misc/lkdtm/heap.c
index 1323bc16f113..a72a241e314a 100644
--- a/drivers/misc/lkdtm/heap.c
+++ b/drivers/misc/lkdtm/heap.c
@@ -205,6 +205,46 @@ static void ctor_a(void *region)
static void ctor_b(void *region)
{ }
+#define HEAP_SPRAY_SIZE 128
+
+void lkdtm_HEAP_SPRAY(void)
+{
+ int *addr;
+ int *spray_addrs[HEAP_SPRAY_SIZE] = { 0 };
+ unsigned long i = 0;
+
+ addr = kmem_cache_alloc(a_cache, GFP_KERNEL);
+ if (!addr) {
+ pr_info("Unable to allocate memory in lkdtm-heap-a cache\n");
+ return;
+ }
+
+ *addr = 0x31337;
+ kmem_cache_free(a_cache, addr);
+
+ pr_info("Performing heap spraying...\n");
+ for (i = 0; i < HEAP_SPRAY_SIZE; i++) {
+ spray_addrs[i] = kmem_cache_alloc(a_cache, GFP_KERNEL);
+ *spray_addrs[i] = 0x31337;
+ pr_info("attempt %lu: spray alloc addr %p vs freed addr %p\n",
+ i, spray_addrs[i], addr);
+ if (spray_addrs[i] == addr) {
+ pr_info("freed addr is reallocated!\n");
+ break;
+ }
+ }
+
+ if (i < HEAP_SPRAY_SIZE)
+ pr_info("FAIL! Heap spraying succeed :(\n");
+ else
+ pr_info("OK! Heap spraying hasn't succeed :)\n");
+
+ for (i = 0; i < HEAP_SPRAY_SIZE; i++) {
+ if (spray_addrs[i])
+ kmem_cache_free(a_cache, spray_addrs[i]);
+ }
+}
+
void __init lkdtm_heap_init(void)
{
double_free_cache = kmem_cache_create("lkdtm-heap-double_free",
diff --git a/drivers/misc/lkdtm/lkdtm.h b/drivers/misc/lkdtm/lkdtm.h
index 8878538b2c13..dfafb4ae6f3a 100644
--- a/drivers/misc/lkdtm/lkdtm.h
+++ b/drivers/misc/lkdtm/lkdtm.h
@@ -45,6 +45,7 @@ void lkdtm_READ_BUDDY_AFTER_FREE(void);
void lkdtm_SLAB_FREE_DOUBLE(void);
void lkdtm_SLAB_FREE_CROSS(void);
void lkdtm_SLAB_FREE_PAGE(void);
+void lkdtm_HEAP_SPRAY(void);
/* lkdtm_perms.c */
void __init lkdtm_perms_init(void);
--
2.26.2
next prev parent reply other threads:[~2020-08-13 15:19 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-13 15:19 [PATCH RFC 0/2] Break heap spraying needed for exploiting use-after-free Alexander Popov
2020-08-13 15:19 ` [PATCH RFC 1/2] mm: Extract SLAB_QUARANTINE from KASAN Alexander Popov
2020-08-15 16:52 ` Kees Cook
2020-08-17 11:53 ` Andrey Konovalov
2020-08-17 17:32 ` Alexander Popov
2020-08-18 15:45 ` Andrey Konovalov
2020-08-18 20:50 ` Alexander Popov
2020-08-15 18:54 ` Matthew Wilcox
2020-08-16 19:59 ` Pavel Machek
2020-08-17 21:03 ` Alexander Popov
2020-08-17 20:34 ` Alexander Popov
2020-08-13 15:19 ` Alexander Popov [this message]
2020-08-15 16:59 ` [PATCH RFC 2/2] lkdtm: Add heap spraying test Kees Cook
2020-08-17 17:54 ` Alexander Popov
2020-08-17 18:24 ` Eric W. Biederman
2020-08-17 19:24 ` Kees Cook
2020-08-14 21:01 ` [PATCH RFC 0/2] Break heap spraying needed for exploiting use-after-free Alexander Popov
2020-08-15 16:39 ` Kees Cook
2020-08-18 9:08 ` Alexander Popov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200813151922.1093791-3-alex.popov@linux.com \
--to=alex.popov@linux.com \
--cc=akpm@linux-foundation.org \
--cc=arnd@arndb.de \
--cc=aryabinin@virtuozzo.com \
--cc=cl@linux.com \
--cc=dhowells@redhat.com \
--cc=dvyukov@google.com \
--cc=ebiederm@xmission.com \
--cc=glider@google.com \
--cc=gregkh@linuxfoundation.org \
--cc=hannes@cmpxchg.org \
--cc=iamjoonsoo.kim@lge.com \
--cc=jannh@google.com \
--cc=kasan-dev@googlegroups.com \
--cc=keescook@chromium.org \
--cc=kernel-hardening@lists.openwall.com \
--cc=krzk@kernel.org \
--cc=labbott@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=masahiroy@kernel.org \
--cc=mhiramat@kernel.org \
--cc=notify@kernel.org \
--cc=patrick.bellasi@arm.com \
--cc=penberg@kernel.org \
--cc=peterz@infradead.org \
--cc=rientjes@google.com \
--cc=rostedt@goodmis.org \
--cc=will@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).