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-rw-r--r--mm/slab_common.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 0042fb2730d1..af0f370fe7a2 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -143,8 +143,10 @@ int slab_unmergeable(struct kmem_cache *s)
if (s->ctor)
return 1;
+#ifdef CONFIG_HARDENED_USERCOPY
if (s->usersize)
return 1;
+#endif
/*
* We may have set a slab to be unmergeable during bootstrap.
@@ -223,8 +225,10 @@ static struct kmem_cache *create_cache(const char *name,
s->size = s->object_size = object_size;
s->align = align;
s->ctor = ctor;
+#ifdef CONFIG_HARDENED_USERCOPY
s->useroffset = useroffset;
s->usersize = usersize;
+#endif
err = __kmem_cache_create(s, flags);
if (err)
@@ -317,7 +321,8 @@ kmem_cache_create_usercopy(const char *name,
flags &= CACHE_CREATE_MASK;
/* Fail closed on bad usersize of useroffset values. */
- if (WARN_ON(!usersize && useroffset) ||
+ if (!IS_ENABLED(CONFIG_HARDENED_USERCOPY) ||
+ WARN_ON(!usersize && useroffset) ||
WARN_ON(size < usersize || size - usersize < useroffset))
usersize = useroffset = 0;
@@ -595,8 +600,8 @@ void kmem_dump_obj(void *object)
ptroffset = ((char *)object - (char *)kp.kp_objp) - kp.kp_data_offset;
pr_cont(" pointer offset %lu", ptroffset);
}
- if (kp.kp_slab_cache && kp.kp_slab_cache->usersize)
- pr_cont(" size %u", kp.kp_slab_cache->usersize);
+ if (kp.kp_slab_cache && kp.kp_slab_cache->object_size)
+ pr_cont(" size %u", kp.kp_slab_cache->object_size);
if (kp.kp_ret)
pr_cont(" allocated at %pS\n", kp.kp_ret);
else
@@ -640,8 +645,10 @@ void __init create_boot_cache(struct kmem_cache *s, const char *name,
align = max(align, size);
s->align = calculate_alignment(flags, align, size);
+#ifdef CONFIG_HARDENED_USERCOPY
s->useroffset = useroffset;
s->usersize = usersize;
+#endif
err = __kmem_cache_create(s, flags);