summaryrefslogtreecommitdiff
path: root/drivers/misc/lkdtm.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/misc/lkdtm.c')
-rw-r--r--drivers/misc/lkdtm.c45
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/misc/lkdtm.c b/drivers/misc/lkdtm.c
index a00a2b11b821..8e00e2e992d1 100644
--- a/drivers/misc/lkdtm.c
+++ b/drivers/misc/lkdtm.c
@@ -93,6 +93,8 @@ enum ctype {
CT_OVERWRITE_ALLOCATION,
CT_WRITE_AFTER_FREE,
CT_READ_AFTER_FREE,
+ CT_WRITE_BUDDY_AFTER_FREE,
+ CT_READ_BUDDY_AFTER_FREE,
CT_SOFTLOCKUP,
CT_HARDLOCKUP,
CT_SPINLOCKUP,
@@ -131,6 +133,8 @@ static char* cp_type[] = {
"OVERWRITE_ALLOCATION",
"WRITE_AFTER_FREE",
"READ_AFTER_FREE",
+ "WRITE_BUDDY_AFTER_FREE",
+ "READ_BUDDY_AFTER_FREE",
"SOFTLOCKUP",
"HARDLOCKUP",
"SPINLOCKUP",
@@ -464,6 +468,47 @@ static void lkdtm_do_action(enum ctype which)
kfree(val);
break;
}
+ case CT_WRITE_BUDDY_AFTER_FREE: {
+ unsigned long p = __get_free_page(GFP_KERNEL);
+ if (!p)
+ break;
+ pr_info("Writing to the buddy page before free\n");
+ memset((void *)p, 0x3, PAGE_SIZE);
+ free_page(p);
+ schedule();
+ pr_info("Attempting bad write to the buddy page after free\n");
+ memset((void *)p, 0x78, PAGE_SIZE);
+ break;
+ }
+ case CT_READ_BUDDY_AFTER_FREE: {
+ unsigned long p = __get_free_page(GFP_KERNEL);
+ int saw, *val = kmalloc(1024, GFP_KERNEL);
+ int *base;
+
+ if (!p)
+ break;
+
+ if (!val)
+ break;
+
+ base = (int *)p;
+
+ *val = 0x12345678;
+ base[0] = *val;
+ pr_info("Value in memory before free: %x\n", base[0]);
+ free_page(p);
+ pr_info("Attempting to read from freed memory\n");
+ saw = base[0];
+ if (saw != *val) {
+ /* Good! Poisoning happened, so declare a win. */
+ pr_info("Buddy page correctly poisoned, calling BUG\n");
+ BUG();
+ }
+ pr_info("Buddy page was not poisoned\n");
+
+ kfree(val);
+ break;
+ }
case CT_SOFTLOCKUP:
preempt_disable();
for (;;)