Merge branch 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/vegard/kmemcheck

* 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/vegard/kmemcheck: (39 commits)
  signal: fix __send_signal() false positive kmemcheck warning
  fs: fix do_mount_root() false positive kmemcheck warning
  fs: introduce __getname_gfp()
  trace: annotate bitfields in struct ring_buffer_event
  net: annotate struct sock bitfield
  c2port: annotate bitfield for kmemcheck
  net: annotate inet_timewait_sock bitfields
  ieee1394/csr1212: fix false positive kmemcheck report
  ieee1394: annotate bitfield
  net: annotate bitfields in struct inet_sock
  net: use kmemcheck bitfields API for skbuff
  kmemcheck: introduce bitfield API
  kmemcheck: add opcode self-testing at boot
  x86: unify pte_hidden
  x86: make _PAGE_HIDDEN conditional
  kmemcheck: make kconfig accessible for other architectures
  kmemcheck: enable in the x86 Kconfig
  kmemcheck: add hooks for the page allocator
  kmemcheck: add hooks for page- and sg-dma-mappings
  kmemcheck: don't track page tables
  ...

1 files changed, 34 insertions, 4 deletions

diff --git a/mm/slub.c b/mm/slub.c
index 30354bfeb43d..15960a09abb1 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -18,6 +18,7 @@
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/kmemtrace.h>
+#include <linux/kmemcheck.h>
 #include <linux/cpu.h>
 #include <linux/cpuset.h>
 #include <linux/kmemleak.h>
@@ -147,7 +148,7 @@
                 SLAB_TRACE | SLAB_DESTROY_BY_RCU | SLAB_NOLEAKTRACE)
 
 #define SLUB_MERGE_SAME (SLAB_DEBUG_FREE | SLAB_RECLAIM_ACCOUNT | \
-                SLAB_CACHE_DMA)
+                SLAB_CACHE_DMA | SLAB_NOTRACK)
 
 #ifndef ARCH_KMALLOC_MINALIGN
 #define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long)
@@ -1071,6 +1072,8 @@ static inline struct page *alloc_slab_page(gfp_t flags, int node,
 {
         int order = oo_order(oo);
 
+        flags |= __GFP_NOTRACK;
+
         if (node == -1)
                 return alloc_pages(flags, order);
         else
@@ -1098,6 +1101,24 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
 
                 stat(get_cpu_slab(s, raw_smp_processor_id()), ORDER_FALLBACK);
         }
+
+        if (kmemcheck_enabled
+                && !(s->flags & (SLAB_NOTRACK | DEBUG_DEFAULT_FLAGS)))
+        {
+                int pages = 1 << oo_order(oo);
+
+                kmemcheck_alloc_shadow(page, oo_order(oo), flags, node);
+
+                /*
+                 * Objects from caches that have a constructor don't get
+                 * cleared when they're allocated, so we need to do it here.
+                 */
+                if (s->ctor)
+                        kmemcheck_mark_uninitialized_pages(page, pages);
+                else
+                        kmemcheck_mark_unallocated_pages(page, pages);
+        }
+
         page->objects = oo_objects(oo);
         mod_zone_page_state(page_zone(page),
                 (s->flags & SLAB_RECLAIM_ACCOUNT) ?
@@ -1171,6 +1192,8 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
                 __ClearPageSlubDebug(page);
         }
 
+        kmemcheck_free_shadow(page, compound_order(page));
+
         mod_zone_page_state(page_zone(page),
                 (s->flags & SLAB_RECLAIM_ACCOUNT) ?
                 NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
@@ -1626,7 +1649,9 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,
         if (unlikely((gfpflags & __GFP_ZERO) && object))
                 memset(object, 0, objsize);
 
+        kmemcheck_slab_alloc(s, gfpflags, object, c->objsize);
         kmemleak_alloc_recursive(object, objsize, 1, s->flags, gfpflags);
+
         return object;
 }
 
@@ -1759,6 +1784,7 @@ static __always_inline void slab_free(struct kmem_cache *s,
         kmemleak_free_recursive(x, s->flags);
         local_irq_save(flags);
         c = get_cpu_slab(s, smp_processor_id());
+        kmemcheck_slab_free(s, object, c->objsize);
         debug_check_no_locks_freed(object, c->objsize);
         if (!(s->flags & SLAB_DEBUG_OBJECTS))
                 debug_check_no_obj_freed(object, c->objsize);
@@ -2633,7 +2659,8 @@ static noinline struct kmem_cache *dma_kmalloc_cache(int index, gfp_t flags)
 
         if (!s || !text || !kmem_cache_open(s, flags, text,
                         realsize, ARCH_KMALLOC_MINALIGN,
-                        SLAB_CACHE_DMA|__SYSFS_ADD_DEFERRED, NULL)) {
+                        SLAB_CACHE_DMA|SLAB_NOTRACK|__SYSFS_ADD_DEFERRED,
+                        NULL)) {
                 kfree(s);
                 kfree(text);
                 goto unlock_out;
@@ -2727,9 +2754,10 @@ EXPORT_SYMBOL(__kmalloc);
 
 static void *kmalloc_large_node(size_t size, gfp_t flags, int node)
 {
-        struct page *page = alloc_pages_node(node, flags | __GFP_COMP,
-                                                get_order(size));
+        struct page *page;
 
+        flags |= __GFP_COMP | __GFP_NOTRACK;
+        page = alloc_pages_node(node, flags, get_order(size));
         if (page)
                 return page_address(page);
         else
@@ -4412,6 +4440,8 @@ static char *create_unique_id(struct kmem_cache *s)
                 *p++ = 'a';
         if (s->flags & SLAB_DEBUG_FREE)
                 *p++ = 'F';
+        if (!(s->flags & SLAB_NOTRACK))
+                *p++ = 't';
         if (p != name + 1)
                 *p++ = '-';
         p += sprintf(p, "%07d", s->size);