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Date: Mon, 22 Feb 2016 17:27:51 -0800
From: Laura Abbott <labbott@...oraproject.org>
To: Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Kees Cook <keescook@...omium.org>
Cc: Laura Abbott <labbott@...oraproject.org>, linux-kernel@...r.kernel.org,
kernel-hardening@...ts.openwall.com
Subject: [PATCHv3 1/2] lkdtm: Add READ_AFTER_FREE test
In a similar manner to WRITE_AFTER_FREE, add a READ_AFTER_FREE
test to test free poisoning features. Sample output when
no sanitization is present:
[ 22.414170] lkdtm: Performing direct entry READ_AFTER_FREE
[ 22.415124] lkdtm: Value in memory before free: 12345678
[ 22.415900] lkdtm: Attempting to read from freed memory
[ 22.416394] lkdtm: Successfully read value: 12345678
with slub_debug=P:
[ 25.874585] lkdtm: Performing direct entry READ_AFTER_FREE
[ 25.875527] lkdtm: Value in memory before free: 12345678
[ 25.876382] lkdtm: Attempting to read from freed memory
[ 25.876900] general protection fault: 0000 [#1] SMP
Signed-off-by: Laura Abbott <labbott@...oraproject.org>
---
v3: Add mention of slub debug option to give example crash.
Change 'return' to 'break' to better match with the other
functions.
---
drivers/misc/lkdtm.c | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/drivers/misc/lkdtm.c b/drivers/misc/lkdtm.c
index 11fdadc..f95a582 100644
--- a/drivers/misc/lkdtm.c
+++ b/drivers/misc/lkdtm.c
@@ -92,6 +92,7 @@ enum ctype {
CT_UNALIGNED_LOAD_STORE_WRITE,
CT_OVERWRITE_ALLOCATION,
CT_WRITE_AFTER_FREE,
+ CT_READ_AFTER_FREE,
CT_SOFTLOCKUP,
CT_HARDLOCKUP,
CT_SPINLOCKUP,
@@ -129,6 +130,7 @@ static char* cp_type[] = {
"UNALIGNED_LOAD_STORE_WRITE",
"OVERWRITE_ALLOCATION",
"WRITE_AFTER_FREE",
+ "READ_AFTER_FREE",
"SOFTLOCKUP",
"HARDLOCKUP",
"SPINLOCKUP",
@@ -417,6 +419,38 @@ static void lkdtm_do_action(enum ctype which)
memset(data, 0x78, len);
break;
}
+ case CT_READ_AFTER_FREE: {
+ int **base;
+ int *val, *tmp;
+ size_t len = 1024;
+ /*
+ * The slub allocator uses the first word to store the free
+ * pointer in some configurations. Use the middle of the
+ * allocation to avoid running into the freelist
+ */
+ size_t offset = (len/sizeof(int *))/2;
+
+ base = kmalloc(len, GFP_KERNEL);
+ if (!base)
+ break;
+
+ val = kmalloc(len, GFP_KERNEL);
+ if (!val)
+ break;
+
+ *val = 0x12345678;
+ pr_info("Value in memory before free: %x\n", *val);
+
+ base[offset] = val;
+ kfree(base);
+
+ tmp = base[offset];
+ pr_info("Attempting to read from freed memory\n");
+ pr_info("Successfully read value: %x\n", *tmp);
+
+ kfree(val);
+ break;
+ }
case CT_SOFTLOCKUP:
preempt_disable();
for (;;)
--
2.5.0
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