lkdtm: Add read/write after free tests for buddy memory

The current tests for read/write after free work on slab
allocated memory. Memory straight from the buddy allocator
may behave slightly differently and have a different set
of parameters to test. Add tests for those cases as well.

On a basic x86 boot:

 # echo WRITE_BUDDY_AFTER_FREE > /sys/kernel/debug/provoke-crash/DIRECT
[   22.291950] lkdtm: Performing direct entry WRITE_BUDDY_AFTER_FREE
[   22.292983] lkdtm: Writing to the buddy page before free
[   22.293950] lkdtm: Attempting bad write to the buddy page after free

 # echo READ_BUDDY_AFTER_FREE > /sys/kernel/debug/provoke-crash/DIRECT
[   32.375601] lkdtm: Performing direct entry READ_BUDDY_AFTER_FREE
[   32.379896] lkdtm: Value in memory before free: 12345678
[   32.383854] lkdtm: Attempting to read from freed memory
[   32.389309] lkdtm: Buddy page was not poisoned

On x86 with CONFIG_DEBUG_PAGEALLOC and debug_pagealloc=on:

 # echo WRITE_BUDDY_AFTER_FREE > /sys/kernel/debug/provoke-crash/DIRECT
[   17.475533] lkdtm: Performing direct entry WRITE_BUDDY_AFTER_FREE
[   17.477360] lkdtm: Writing to the buddy page before free
[   17.479089] lkdtm: Attempting bad write to the buddy page after free
[   17.480904] BUG: unable to handle kernel paging request at
ffff88000ebd8000

 # echo READ_BUDDY_AFTER_FREE > /sys/kernel/debug/provoke-crash/DIRECT
[   14.606433] lkdtm: Performing direct entry READ_BUDDY_AFTER_FREE
[   14.607447] lkdtm: Value in memory before free: 12345678
[   14.608161] lkdtm: Attempting to read from freed memory
[   14.608860] BUG: unable to handle kernel paging request at
ffff88000eba3000

Note that arches without ARCH_SUPPORTS_DEBUG_PAGEALLOC may not
produce the same crash.

Signed-off-by: Laura Abbott <labbott@fedoraproject.org>
Signed-off-by: Kees Cook <keescook@chromium.org>

diff --git a/drivers/misc/lkdtm.c b/drivers/misc/lkdtm.c
index a00a2b1..8e00e2e 100644 (file)
--- 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 (;;)