diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/slab.c | 3 | ||||
| -rw-r--r-- | mm/slab_common.c | 8 | ||||
| -rw-r--r-- | mm/slub.c | 3 |
3 files changed, 12 insertions, 2 deletions
@@ -4426,7 +4426,8 @@ void __check_heap_object(const void *ptr, unsigned long n, struct page *page, * to be a temporary method to find any missing usercopy * whitelists. */ - if (offset <= cachep->object_size && + if (usercopy_fallback && + offset <= cachep->object_size && n <= cachep->object_size - offset) { usercopy_warn("SLAB object", cachep->name, to_user, offset, n); return; diff --git a/mm/slab_common.c b/mm/slab_common.c index fc3e66b..a51f654 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -31,6 +31,14 @@ LIST_HEAD(slab_caches); DEFINE_MUTEX(slab_mutex); struct kmem_cache *kmem_cache; +#ifdef CONFIG_HARDENED_USERCOPY +bool usercopy_fallback __ro_after_init = + IS_ENABLED(CONFIG_HARDENED_USERCOPY_FALLBACK); +module_param(usercopy_fallback, bool, 0400); +MODULE_PARM_DESC(usercopy_fallback, + "WARN instead of reject usercopy whitelist violations"); +#endif + static LIST_HEAD(slab_caches_to_rcu_destroy); static void slab_caches_to_rcu_destroy_workfn(struct work_struct *work); static DECLARE_WORK(slab_caches_to_rcu_destroy_work, @@ -3859,7 +3859,8 @@ void __check_heap_object(const void *ptr, unsigned long n, struct page *page, * whitelists. */ object_size = slab_ksize(s); - if (offset <= object_size && n <= object_size - offset) { + if (usercopy_fallback && + offset <= object_size && n <= object_size - offset) { usercopy_warn("SLUB object", s->name, to_user, offset, n); return; } |
