metadata_access_disable();
}
+/*
+ * See comment in calculate_sizes().
+ */
+static inline bool freeptr_outside_object(struct kmem_cache *s)
+{
+ return s->offset >= s->inuse;
+}
+
+/*
+ * Return offset of the end of info block which is inuse + free pointer if
+ * not overlapping with object.
+ */
+static inline unsigned int get_info_end(struct kmem_cache *s)
+{
+ if (freeptr_outside_object(s))
+ return s->inuse + sizeof(void *);
+ else
+ return s->inuse;
+}
+
static struct track *get_track(struct kmem_cache *s, void *object,
enum track_item alloc)
{
struct track *p;
- if (s->offset)
- p = object + s->offset + sizeof(void *);
- else
- p = object + s->inuse;
+ p = object + get_info_end(s);
return p + alloc;
}
va_end(args);
}
+static bool freelist_corrupted(struct kmem_cache *s, struct page *page,
+ void *freelist, void *nextfree)
+{
+ if ((s->flags & SLAB_CONSISTENCY_CHECKS) &&
+ !check_valid_pointer(s, page, nextfree)) {
+ object_err(s, page, freelist, "Freechain corrupt");
+ freelist = NULL;
+ slab_fix(s, "Isolate corrupted freechain");
+ return true;
+ }
+
+ return false;
+}
+
static void print_trailer(struct kmem_cache *s, struct page *page, u8 *p)
{
unsigned int off; /* Offset of last byte */
print_section(KERN_ERR, "Redzone ", p + s->object_size,
s->inuse - s->object_size);
- if (s->offset)
- off = s->offset + sizeof(void *);
- else
- off = s->inuse;
+ off = get_info_end(s);
if (s->flags & SLAB_STORE_USER)
off += 2 * sizeof(struct track);
* object address
* Bytes of the object to be managed.
* If the freepointer may overlay the object then the free
- * pointer is the first word of the object.
+ * pointer is at the middle of the object.
*
* Poisoning uses 0x6b (POISON_FREE) and the last byte is
* 0xa5 (POISON_END)
static int check_pad_bytes(struct kmem_cache *s, struct page *page, u8 *p)
{
- unsigned long off = s->inuse; /* The end of info */
-
- if (s->offset)
- /* Freepointer is placed after the object. */
- off += sizeof(void *);
+ unsigned long off = get_info_end(s); /* The end of info */
if (s->flags & SLAB_STORE_USER)
/* We also have user information there */
check_pad_bytes(s, page, p);
}
- if (!s->offset && val == SLUB_RED_ACTIVE)
+ if (!freeptr_outside_object(s) && val == SLUB_RED_ACTIVE)
/*
* Object and freepointer overlap. Cannot check
* freepointer while object is allocated.
static inline void dec_slabs_node(struct kmem_cache *s, int node,
int objects) {}
+static bool freelist_corrupted(struct kmem_cache *s, struct page *page,
+ void *freelist, void *nextfree)
+{
+ return false;
+}
#endif /* CONFIG_SLUB_DEBUG */
/*
void *prior;
unsigned long counters;
+ /*
+ * If 'nextfree' is invalid, it is possible that the object at
+ * 'freelist' is already corrupted. So isolate all objects
+ * starting at 'freelist'.
+ */
+ if (freelist_corrupted(s, page, freelist, nextfree))
+ break;
+
do {
prior = page->freelist;
counters = page->counters;
*
* This is the case if we do RCU, have a constructor or
* destructor or are poisoning the objects.
+ *
+ * The assumption that s->offset >= s->inuse means free
+ * pointer is outside of the object is used in the
+ * freeptr_outside_object() function. If that is no
+ * longer true, the function needs to be modified.
*/
s->offset = size;
size += sizeof(void *);
}
static void list_slab_objects(struct kmem_cache *s, struct page *page,
- const char *text)
+ const char *text, unsigned long *map)
{
#ifdef CONFIG_SLUB_DEBUG
void *addr = page_address(page);
void *p;
- unsigned long *map;
+
+ if (!map)
+ return;
slab_err(s, page, text, s->name);
slab_lock(page);
print_tracking(s, p);
}
}
- put_map(map);
-
slab_unlock(page);
#endif
}
{
LIST_HEAD(discard);
struct page *page, *h;
+ unsigned long *map = NULL;
+
+#ifdef CONFIG_SLUB_DEBUG
+ map = bitmap_alloc(oo_objects(s->max), GFP_KERNEL);
+#endif
BUG_ON(irqs_disabled());
spin_lock_irq(&n->list_lock);
list_add(&page->slab_list, &discard);
} else {
list_slab_objects(s, page,
- "Objects remaining in %s on __kmem_cache_shutdown()");
+ "Objects remaining in %s on __kmem_cache_shutdown()",
+ map);
}
}
spin_unlock_irq(&n->list_lock);
+#ifdef CONFIG_SLUB_DEBUG
+ bitmap_free(map);
+#endif
+
list_for_each_entry_safe(page, h, &discard, slab_list)
discard_slab(s, page);
}
*/
if (buffer)
buf = buffer;
- else if (root_cache->max_attr_size < ARRAY_SIZE(mbuf))
+ else if (root_cache->max_attr_size < ARRAY_SIZE(mbuf) &&
+ !IS_ENABLED(CONFIG_SLUB_STATS))
buf = mbuf;
else {
buffer = (char *) get_zeroed_page(GFP_KERNEL);
.release = kmem_cache_release,
};
-static int uevent_filter(struct kset *kset, struct kobject *kobj)
-{
- struct kobj_type *ktype = get_ktype(kobj);
-
- if (ktype == &slab_ktype)
- return 1;
- return 0;
-}
-
-static const struct kset_uevent_ops slab_uevent_ops = {
- .filter = uevent_filter,
-};
-
static struct kset *slab_kset;
static inline struct kset *cache_kset(struct kmem_cache *s)
#ifdef CONFIG_MEMCG
kset_unregister(s->memcg_kset);
#endif
- kobject_uevent(&s->kobj, KOBJ_REMOVE);
out:
kobject_put(&s->kobj);
}
}
#endif
- kobject_uevent(&s->kobj, KOBJ_ADD);
if (!unmergeable) {
/* Setup first alias */
sysfs_slab_alias(s, s->name);
mutex_lock(&slab_mutex);
- slab_kset = kset_create_and_add("slab", &slab_uevent_ops, kernel_kobj);
+ slab_kset = kset_create_and_add("slab", NULL, kernel_kobj);
if (!slab_kset) {
mutex_unlock(&slab_mutex);
pr_err("Cannot register slab subsystem.\n");
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