size = ALIGN(size, sizeof(void *));
align = calculate_alignment(flags, align, size);
size = ALIGN(size, align);
- flags = kmem_cache_flags(size, flags, name, NULL);
+ flags = kmem_cache_flags(size, flags, name);
if (flags & SLAB_NEVER_MERGE)
return NULL;
const char *cache_name;
int err;
- get_online_cpus();
- get_online_mems();
-
mutex_lock(&slab_mutex);
err = kmem_cache_sanity_check(name, size);
out_unlock:
mutex_unlock(&slab_mutex);
- put_online_mems();
- put_online_cpus();
-
if (err) {
if (flags & SLAB_PANIC)
panic("kmem_cache_create: Failed to create slab '%s'. Error %d\n",
if (unlikely(!s))
return;
- get_online_cpus();
- get_online_mems();
-
mutex_lock(&slab_mutex);
s->refcount--;
}
out_unlock:
mutex_unlock(&slab_mutex);
-
- put_online_mems();
- put_online_cpus();
}
EXPORT_SYMBOL(kmem_cache_destroy);
{
int ret;
- get_online_cpus();
- get_online_mems();
+
kasan_cache_shrink(cachep);
ret = __kmem_cache_shrink(cachep);
- put_online_mems();
- put_online_cpus();
+
return ret;
}
EXPORT_SYMBOL(kmem_cache_shrink);
return slab_state >= UP;
}
+/**
+ * kmem_valid_obj - does the pointer reference a valid slab object?
+ * @object: pointer to query.
+ *
+ * Return: %true if the pointer is to a not-yet-freed object from
+ * kmalloc() or kmem_cache_alloc(), either %true or %false if the pointer
+ * is to an already-freed object, and %false otherwise.
+ */
+bool kmem_valid_obj(void *object)
+{
+ struct page *page;
+
+ /* Some arches consider ZERO_SIZE_PTR to be a valid address. */
+ if (object < (void *)PAGE_SIZE || !virt_addr_valid(object))
+ return false;
+ page = virt_to_head_page(object);
+ return PageSlab(page);
+}
+
+/**
+ * kmem_dump_obj - Print available slab provenance information
+ * @object: slab object for which to find provenance information.
+ *
+ * This function uses pr_cont(), so that the caller is expected to have
+ * printed out whatever preamble is appropriate. The provenance information
+ * depends on the type of object and on how much debugging is enabled.
+ * For a slab-cache object, the fact that it is a slab object is printed,
+ * and, if available, the slab name, return address, and stack trace from
+ * the allocation of that object.
+ *
+ * This function will splat if passed a pointer to a non-slab object.
+ * If you are not sure what type of object you have, you should instead
+ * use mem_dump_obj().
+ */
+void kmem_dump_obj(void *object)
+{
+ char *cp = IS_ENABLED(CONFIG_MMU) ? "" : "/vmalloc";
+ int i;
+ struct page *page;
+ unsigned long ptroffset;
+ struct kmem_obj_info kp = { };
+
+ if (WARN_ON_ONCE(!virt_addr_valid(object)))
+ return;
+ page = virt_to_head_page(object);
+ if (WARN_ON_ONCE(!PageSlab(page))) {
+ pr_cont(" non-slab memory.\n");
+ return;
+ }
+ kmem_obj_info(&kp, object, page);
+ if (kp.kp_slab_cache)
+ pr_cont(" slab%s %s", cp, kp.kp_slab_cache->name);
+ else
+ pr_cont(" slab%s", cp);
+ if (kp.kp_objp)
+ pr_cont(" start %px", kp.kp_objp);
+ if (kp.kp_data_offset)
+ pr_cont(" data offset %lu", kp.kp_data_offset);
+ if (kp.kp_objp) {
+ 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_ret)
+ pr_cont(" allocated at %pS\n", kp.kp_ret);
+ else
+ pr_cont("\n");
+ for (i = 0; i < ARRAY_SIZE(kp.kp_stack); i++) {
+ if (!kp.kp_stack[i])
+ break;
+ pr_info(" %pS\n", kp.kp_stack[i]);
+ }
+}
+
#ifndef CONFIG_SLOB
/* Create a cache during boot when no slab services are available yet */
void __init create_boot_cache(struct kmem_cache *s, const char *name,
page = alloc_pages(flags, order);
if (likely(page)) {
ret = page_address(page);
- mod_node_page_state(page_pgdat(page), NR_SLAB_UNRECLAIMABLE_B,
- PAGE_SIZE << order);
+ mod_lruvec_page_state(page, NR_SLAB_UNRECLAIMABLE_B,
+ PAGE_SIZE << order);
}
ret = kasan_kmalloc_large(ret, size, flags);
/* As ret might get tagged, call kmemleak hook after KASAN. */
size_t size;
/*
- * We need to check that the pointed to object is valid, and only then
- * unpoison the shadow memory below. We use __kasan_check_read(), to
- * generate a more useful report at the time ksize() is called (rather
- * than later where behaviour is undefined due to potential
- * use-after-free or double-free).
+ * We need to first check that the pointer to the object is valid, and
+ * only then unpoison the memory. The report printed from ksize() is
+ * more useful, then when it's printed later when the behaviour could
+ * be undefined due to a potential use-after-free or double-free.
+ *
+ * We use kasan_check_byte(), which is supported for the hardware
+ * tag-based KASAN mode, unlike kasan_check_read/write().
*
- * If the pointed to memory is invalid we return 0, to avoid users of
+ * If the pointed to memory is invalid, we return 0 to avoid users of
* ksize() writing to and potentially corrupting the memory region.
*
* We want to perform the check before __ksize(), to avoid potentially
* crashing in __ksize() due to accessing invalid metadata.
*/
- if (unlikely(ZERO_OR_NULL_PTR(objp)) || !__kasan_check_read(objp, 1))
+ if (unlikely(ZERO_OR_NULL_PTR(objp)) || !kasan_check_byte(objp))
return 0;
size = __ksize(objp);
projects / linux-2.6-microblaze.git / blobdiff