From 10ebd8556b7990499c896a550e3d416b444211e6 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 10 May 2024 02:23:07 +0000
Subject: [PATCH] add led
---
kernel/mm/kasan/generic.c | 128 ++++++++++++++++++++++++++++--------------
1 files changed, 86 insertions(+), 42 deletions(-)
diff --git a/kernel/mm/kasan/generic.c b/kernel/mm/kasan/generic.c
index 504c7936..53cbf28 100644
--- a/kernel/mm/kasan/generic.c
+++ b/kernel/mm/kasan/generic.c
@@ -7,21 +7,14 @@
*
* Some code borrowed from https://github.com/xairy/kasan-prototype by
* Andrey Konovalov <andreyknvl@gmail.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
*/
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#define DISABLE_BRANCH_PROFILING
#include <linux/export.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/kasan.h>
#include <linux/kernel.h>
+#include <linux/kfence.h>
#include <linux/kmemleak.h>
#include <linux/linkage.h>
#include <linux/memblock.h>
@@ -52,7 +45,7 @@
s8 shadow_value = *(s8 *)kasan_mem_to_shadow((void *)addr);
if (unlikely(shadow_value)) {
- s8 last_accessible_byte = addr & KASAN_SHADOW_MASK;
+ s8 last_accessible_byte = addr & KASAN_GRANULE_MASK;
return unlikely(last_accessible_byte >= shadow_value);
}
@@ -68,7 +61,7 @@
* Access crosses 8(shadow size)-byte boundary. Such access maps
* into 2 shadow bytes, so we need to check them both.
*/
- if (unlikely(((addr + size - 1) & KASAN_SHADOW_MASK) < size - 1))
+ if (unlikely(((addr + size - 1) & KASAN_GRANULE_MASK) < size - 1))
return *shadow_addr || memory_is_poisoned_1(addr + size - 1);
return memory_is_poisoned_1(addr + size - 1);
@@ -79,7 +72,7 @@
u16 *shadow_addr = (u16 *)kasan_mem_to_shadow((void *)addr);
/* Unaligned 16-bytes access maps into 3 shadow bytes. */
- if (unlikely(!IS_ALIGNED(addr, KASAN_SHADOW_SCALE_SIZE)))
+ if (unlikely(!IS_ALIGNED(addr, KASAN_GRANULE_SIZE)))
return *shadow_addr || memory_is_poisoned_1(addr + 15);
return *shadow_addr;
@@ -140,7 +133,7 @@
s8 *last_shadow = (s8 *)kasan_mem_to_shadow((void *)last_byte);
if (unlikely(ret != (unsigned long)last_shadow ||
- ((long)(last_byte & KASAN_SHADOW_MASK) >= *last_shadow)))
+ ((long)(last_byte & KASAN_GRANULE_MASK) >= *last_shadow)))
return true;
}
return false;
@@ -166,51 +159,60 @@
return memory_is_poisoned_n(addr, size);
}
-static __always_inline void check_memory_region_inline(unsigned long addr,
+static __always_inline bool check_region_inline(unsigned long addr,
size_t size, bool write,
unsigned long ret_ip)
{
if (unlikely(size == 0))
- return;
+ return true;
+
+ if (unlikely(addr + size < addr))
+ return !kasan_report(addr, size, write, ret_ip);
if (unlikely((void *)addr <
kasan_shadow_to_mem((void *)KASAN_SHADOW_START))) {
- kasan_report(addr, size, write, ret_ip);
- return;
+ return !kasan_report(addr, size, write, ret_ip);
}
if (likely(!memory_is_poisoned(addr, size)))
- return;
+ return true;
- kasan_report(addr, size, write, ret_ip);
+ return !kasan_report(addr, size, write, ret_ip);
}
-void check_memory_region(unsigned long addr, size_t size, bool write,
- unsigned long ret_ip)
+bool kasan_check_range(unsigned long addr, size_t size, bool write,
+ unsigned long ret_ip)
{
- check_memory_region_inline(addr, size, write, ret_ip);
+ return check_region_inline(addr, size, write, ret_ip);
+}
+
+bool kasan_byte_accessible(const void *addr)
+{
+ s8 shadow_byte = READ_ONCE(*(s8 *)kasan_mem_to_shadow(addr));
+
+ return shadow_byte >= 0 && shadow_byte < KASAN_GRANULE_SIZE;
}
void kasan_cache_shrink(struct kmem_cache *cache)
{
- quarantine_remove_cache(cache);
+ kasan_quarantine_remove_cache(cache);
}
void kasan_cache_shutdown(struct kmem_cache *cache)
{
if (!__kmem_cache_empty(cache))
- quarantine_remove_cache(cache);
+ kasan_quarantine_remove_cache(cache);
}
static void register_global(struct kasan_global *global)
{
- size_t aligned_size = round_up(global->size, KASAN_SHADOW_SCALE_SIZE);
+ size_t aligned_size = round_up(global->size, KASAN_GRANULE_SIZE);
- kasan_unpoison_shadow(global->beg, global->size);
+ kasan_unpoison(global->beg, global->size, false);
- kasan_poison_shadow(global->beg + aligned_size,
- global->size_with_redzone - aligned_size,
- KASAN_GLOBAL_REDZONE);
+ kasan_poison(global->beg + aligned_size,
+ global->size_with_redzone - aligned_size,
+ KASAN_GLOBAL_REDZONE, false);
}
void __asan_register_globals(struct kasan_global *globals, size_t size)
@@ -230,7 +232,7 @@
#define DEFINE_ASAN_LOAD_STORE(size) \
void __asan_load##size(unsigned long addr) \
{ \
- check_memory_region_inline(addr, size, false, _RET_IP_);\
+ check_region_inline(addr, size, false, _RET_IP_); \
} \
EXPORT_SYMBOL(__asan_load##size); \
__alias(__asan_load##size) \
@@ -238,7 +240,7 @@
EXPORT_SYMBOL(__asan_load##size##_noabort); \
void __asan_store##size(unsigned long addr) \
{ \
- check_memory_region_inline(addr, size, true, _RET_IP_); \
+ check_region_inline(addr, size, true, _RET_IP_); \
} \
EXPORT_SYMBOL(__asan_store##size); \
__alias(__asan_store##size) \
@@ -253,7 +255,7 @@
void __asan_loadN(unsigned long addr, size_t size)
{
- check_memory_region(addr, size, false, _RET_IP_);
+ kasan_check_range(addr, size, false, _RET_IP_);
}
EXPORT_SYMBOL(__asan_loadN);
@@ -263,7 +265,7 @@
void __asan_storeN(unsigned long addr, size_t size)
{
- check_memory_region(addr, size, true, _RET_IP_);
+ kasan_check_range(addr, size, true, _RET_IP_);
}
EXPORT_SYMBOL(__asan_storeN);
@@ -278,10 +280,10 @@
/* Emitted by compiler to poison alloca()ed objects. */
void __asan_alloca_poison(unsigned long addr, size_t size)
{
- size_t rounded_up_size = round_up(size, KASAN_SHADOW_SCALE_SIZE);
+ size_t rounded_up_size = round_up(size, KASAN_GRANULE_SIZE);
size_t padding_size = round_up(size, KASAN_ALLOCA_REDZONE_SIZE) -
rounded_up_size;
- size_t rounded_down_size = round_down(size, KASAN_SHADOW_SCALE_SIZE);
+ size_t rounded_down_size = round_down(size, KASAN_GRANULE_SIZE);
const void *left_redzone = (const void *)(addr -
KASAN_ALLOCA_REDZONE_SIZE);
@@ -289,13 +291,12 @@
WARN_ON(!IS_ALIGNED(addr, KASAN_ALLOCA_REDZONE_SIZE));
- kasan_unpoison_shadow((const void *)(addr + rounded_down_size),
- size - rounded_down_size);
- kasan_poison_shadow(left_redzone, KASAN_ALLOCA_REDZONE_SIZE,
- KASAN_ALLOCA_LEFT);
- kasan_poison_shadow(right_redzone,
- padding_size + KASAN_ALLOCA_REDZONE_SIZE,
- KASAN_ALLOCA_RIGHT);
+ kasan_unpoison((const void *)(addr + rounded_down_size),
+ size - rounded_down_size, false);
+ kasan_poison(left_redzone, KASAN_ALLOCA_REDZONE_SIZE,
+ KASAN_ALLOCA_LEFT, false);
+ kasan_poison(right_redzone, padding_size + KASAN_ALLOCA_REDZONE_SIZE,
+ KASAN_ALLOCA_RIGHT, false);
}
EXPORT_SYMBOL(__asan_alloca_poison);
@@ -305,7 +306,7 @@
if (unlikely(!stack_top || stack_top > stack_bottom))
return;
- kasan_unpoison_shadow(stack_top, stack_bottom - stack_top);
+ kasan_unpoison(stack_top, stack_bottom - stack_top, false);
}
EXPORT_SYMBOL(__asan_allocas_unpoison);
@@ -323,3 +324,46 @@
DEFINE_ASAN_SET_SHADOW(f3);
DEFINE_ASAN_SET_SHADOW(f5);
DEFINE_ASAN_SET_SHADOW(f8);
+
+void kasan_record_aux_stack(void *addr)
+{
+ struct page *page = kasan_addr_to_page(addr);
+ struct kmem_cache *cache;
+ struct kasan_alloc_meta *alloc_meta;
+ void *object;
+
+ if (is_kfence_address(addr) || !(page && PageSlab(page)))
+ return;
+
+ cache = page->slab_cache;
+ object = nearest_obj(cache, page, addr);
+ alloc_meta = kasan_get_alloc_meta(cache, object);
+ if (!alloc_meta)
+ return;
+
+ alloc_meta->aux_stack[1] = alloc_meta->aux_stack[0];
+ alloc_meta->aux_stack[0] = kasan_save_stack(GFP_NOWAIT);
+}
+
+void kasan_set_free_info(struct kmem_cache *cache,
+ void *object, u8 tag)
+{
+ struct kasan_free_meta *free_meta;
+
+ free_meta = kasan_get_free_meta(cache, object);
+ if (!free_meta)
+ return;
+
+ kasan_set_track(&free_meta->free_track, GFP_NOWAIT);
+ /* The object was freed and has free track set. */
+ *(u8 *)kasan_mem_to_shadow(object) = KASAN_KMALLOC_FREETRACK;
+}
+
+struct kasan_track *kasan_get_free_track(struct kmem_cache *cache,
+ void *object, u8 tag)
+{
+ if (*(u8 *)kasan_mem_to_shadow(object) != KASAN_KMALLOC_FREETRACK)
+ return NULL;
+ /* Free meta must be present with KASAN_KMALLOC_FREETRACK. */
+ return &kasan_get_free_meta(cache, object)->free_track;
+}
--
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