kmemcheck: add the kmemcheck core
General description: kmemcheck is a patch to the linux kernel that
detects use of uninitialized memory. It does this by trapping every
read and write to memory that was allocated dynamically (e.g. using
kmalloc()). If a memory address is read that has not previously been
written to, a message is printed to the kernel log.
Thanks to Andi Kleen for the set_memory_4k() solution.
Andrew Morton suggested documenting the shadow member of struct page.
Signed-off-by: Vegard Nossum <vegardno@ifi.uio.no>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
[export kmemcheck_mark_initialized]
[build fix for setup_max_cpus]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
[rebased for mainline inclusion]
Signed-off-by: Vegard Nossum <vegardno@ifi.uio.no>
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 0e80e26..0042090 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -98,6 +98,14 @@
#ifdef CONFIG_WANT_PAGE_DEBUG_FLAGS
unsigned long debug_flags; /* Use atomic bitops on this */
#endif
+
+#ifdef CONFIG_KMEMCHECK
+ /*
+ * kmemcheck wants to track the status of each byte in a page; this
+ * is a pointer to such a status block. NULL if not tracked.
+ */
+ void *shadow;
+#endif
};
/*