ohos-chromium-security-review
npx skills add https://github.com/openharmonyinsight/openharmony-skills --skill ohos-chromium-security-review
Agent 安装分布
Skill 文档
OpenHarmony/Chromium 深度代ç 审计æè½
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// â 严éè¿åï¼å¼æ¥ä»»å¡ä½¿ç¨ Unretained
PostTask(
FROM_HERE,
base::BindOnce(&MyClass::OnTask, base::Unretained(this))
);
// 妿 this è¢«éæ¯ï¼OnTask æ§è¡æ¶ä¼å¯¼è´ UAF
// â æ£ç¡®ï¼ä½¿ç¨ WeakPtr
PostTask(
FROM_HERE,
base::BindOnce(&MyClass::OnTask, weak_factory_.GetWeakPtr())
);
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代ç 示ä¾ï¼
// â 严éè¿åï¼è·¨çº¿ç¨ä½¿ç¨ WeakPtr
// 线ç¨A
weak_factory_ = std::make_unique<base::WeakPtrFactory<MyClass>>(this);
// 线ç¨B
auto weak = weak_ptr_;
if (weak) { // æªå®ä¹è¡ä¸ºï¼
weak->Method();
}
// â æ£ç¡®ï¼ä½¿ç¨ SequenceSafe æç¡®ä¿å线ç¨
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JSON è¾åºï¼ç»æåæ°æ®ï¼
[
{
"summary": "ç®çè¯ä»·ï¼100å以å
ï¼",
"score": 85,
"responsible_team": "åºç¡æ¡æ¶",
"issues": [
{
"line": 123,
"severity": "Critical",
"rule_violated": "è§å1-Unretainedçå½å¨æ",
"analysis": "è¿éå¨å¼æ¥ä»»å¡ä¸ä½¿ç¨äº Unretainedï¼å¯è½å¯¼è´ UAFãå½ PostTask çåè°æ§è¡æ¶ï¼this æéå¯è½å·²è¢«éæ¯ï¼å¯¼è´ Use-After-Free æ¼æ´ã",
"vector": "弿¥åè°è§¦åæ¶å¯¹è±¡å·²éæ¯",
"fix_code": "base::BindOnce(&MyClass::OnTask, weak_factory_.GetWeakPtr())"
},
{
"line": 456,
"severity": "High",
"rule_violated": "è§å7-WeakPtr线ç¨ç»å®",
"analysis": "WeakPtr å¨çº¿ç¨Aå建ï¼å¨çº¿ç¨B使ç¨ï¼è¿åäºçº¿ç¨ç»å®çº¦æãè¿æ¯æªå®ä¹è¡ä¸ºã",
"vector": "跨线ç¨è®¿é® WeakPtr",
"fix_code": "ä½¿ç¨ base::SequencedTaskRunnerHandle::Get()->PostTask() ç¡®ä¿åçº¿ç¨æ§è¡"
}
]
}
]
Markdown è¾åºï¼è¯¦ç»æ¥åï¼
# 代ç 审计æ¥å
## 审计æ¦è¦
**代ç èå´**ï¼`src/content/browser/renderer_host/`
**å®¡è®¡æ¥æ**ï¼2025-01-29
**审计人**ï¼OHOS/Chromium å®å
¨å®¡è®¡ä¸å®¶
**æ»ä½è¯å**ï¼85/100
**ç®çè¯ä»·**ï¼
ä»£ç æ´ä½ç»ææ¸
æ°ï¼ä½å¨å¤çº¿ç¨çå½å¨æç®¡çä¸åå¨å å¤ä¸¥é鿣ãå
³é®é®é¢éä¸å¨å¼æ¥ä»»å¡ç WeakPtr 使ç¨ç¼ºå¤±ï¼ä»¥å跨线ç¨è®¿é® GPU ç¸å
³èµæºæ¶ç线ç¨çº¦æè¿è§ã
### é®é¢ç»è®¡
| 䏥鿧 | æ°é |
|--------|------|
| Critical | 3 |
| High | 5 |
| Medium | 8 |
| Low | 12 |
### 责任å¢éåå¸
| å¢é | é®é¢æ° |
|------|--------|
| åºç¡æ¡æ¶ | 8 |
| 渲æåæ | 6 |
| 交äºå¨æ | 4 |
| æ§è½ | 3 |
| ç½é¡µæµè§ | 7 |
---
## 详ç»é®é¢å表
### [Critical] è§å1-Unretainedçå½å¨æï¼å¼æ¥ä»»å¡ä¸ç UAF é£é©
**ä½ç½®**ï¼`src/content/browser/renderer_host/render_widget_host_impl.cc:1234`
**责任å¢é**ï¼åºç¡æ¡æ¶
**é®é¢æè¿°**ï¼
å¨å¼æ¥ PostTask ä¸ä½¿ç¨äº `base::Unretained(this)`ï¼ä½æ²¡æå¯¹ `this` ççå½å¨ææä¾ä»»ä½ä¿æ¤ãå½å¼æ¥åè°æ§è¡æ¶ï¼`RenderWidgetHostImpl` 对象å¯è½å·²è¢«éæ¯ï¼å¯¼è´ Use-After-Free æ¼æ´ã
**å½å代ç **ï¼
```cpp
void RenderWidgetHostImpl::ScheduleComposite() {
base::PostTask(
FROM_HERE,
{base::ThreadPool()},
base::BindOnce(&RenderWidgetHostImpl::OnComposite,
base::Unretained(this))); // â 第1237è¡
}
é®é¢åæï¼
PostTaskå°ä»»å¡æéå°çº¿ç¨æ± ï¼è¿æ¯å¼æ¥æ§è¡- 使ç¨
Unretained(this)没æä»»ä½çå½å¨æä¿æ¤ - 妿
RenderWidgetHostImplå¨åè°æ§è¡åè¢«éæ¯ï¼å°è®¿é®å·²éæ¾çå å - æ»å»è å¯ä»¥éè¿æ§å¶é¡µé¢çå½å¨æè§¦åæ¤æ¼æ´
ä¿®å¤å»ºè®®ï¼
void RenderWidgetHostImpl::ScheduleComposite() {
base::PostTask(
FROM_HERE,
{base::ThreadPool()},
base::BindOnce(&RenderWidgetHostImpl::OnComposite,
weak_factory_.GetWeakPtr())); // â ä½¿ç¨ WeakPtr
}
å½±ååæï¼
- 䏥鿧ï¼Critical
- å¯ä¿¡åº¦ï¼Confirmed
- å½±åèå´ï¼å¯è½å¯¼è´æ¸²æè¿ç¨å´©æºï¼æè¢«å©ç¨è¿è¡å åç ´åæ»å»
- è§¦åæ¡ä»¶ï¼é¡µé¢å¨å¼æ¥åè°æ§è¡åè¢«å ³é
[High] è§å7-WeakPtr线ç¨ç»å®ï¼è·¨åºåä½¿ç¨ WeakPtr
ä½ç½®ï¼src/content/browser/web_contents/web_contents_impl.cc:5678
责任å¢éï¼ç½é¡µæµè§
é®é¢æè¿°ï¼
WeakPtr å¨ UI 线ç¨å建ï¼ä½å¨ IO 线ç¨ä½¿ç¨ï¼è¿åäº WeakPtr ç线ç¨ç»å®çº¦æã
å½å代ç ï¼
// å¨ UI 线ç¨
weak_ptr_factory_ = std::make_unique<base::WeakPtrFactory<WebContentsImpl>>(this);
// å¨ IO 线ç¨åè°
void WebContentsImpl::OnNetworkRequest() {
if (weak_ptr_) { // â 第5680è¡ï¼è·¨çº¿ç¨è®¿é®
weak_ptr_->HandleRequest();
}
}
é®é¢åæï¼
- WeakPtr çå®ç°ä¾èµäºçº¿ç¨å±é¨åå¨
- 跨线ç¨è®¿é® WeakPtr æ¯æªå®ä¹è¡ä¸º
- å¯è½å¯¼è´æ£æ¥å¤±è´¥æè®¿é®æ æå¯¹è±¡
ä¿®å¤å»ºè®®ï¼
// ä½¿ç¨ SequenceSafeWeakPtr æéè¿ PostTask æéå°å线ç¨
void WebContentsImpl::OnNetworkRequest() {
ui_thread_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&WebContentsImpl::HandleRequest, weak_ptr_));
}
å½±ååæï¼
- 䏥鿧ï¼High
- å¯ä¿¡åº¦ï¼Probable
- å½±åèå´ï¼å¯è½å¯¼è´é»è¾é误æå´©æº
[High] è§å2-GPUä»»å¡çº¿ç¨æ£æ¥ï¼Mojo任塿ªæéå°GPU线ç¨
ä½ç½®ï¼src/components/viz/service/compositor_gpu_thread.cc:234
责任å¢éï¼æ¸²æåæ
é®é¢æè¿°ï¼ éè¿ GPU ç mojo ä¸åä»»å¡ï¼ä½æªæ£æ¥æ¯å¦ post å°äºå¯¹åºç GPU 线ç¨ä¸æ§è¡ã
å½å代ç ï¼
void CompositorGpuThread::SubmitCompositorFrame(
mojo::PendingRemote<mojom::CompositorFrameMetadata> metadata) {
// ç´æ¥å¨å½å线ç¨å¤ç
metadata_receiver_->OnFrameMetadata(std::move(metadata)); // â 第237è¡
}
é®é¢åæï¼
- Mojo åè°å¯è½å¨ä»»æçº¿ç¨æ§è¡
compositor_gpu_thread_å¿ é¡»å¨ç¹å®ç GPU 线ç¨è®¿é®- å½åä»£ç æ²¡æéªè¯åæéå°æ£ç¡®ç线ç¨
ä¿®å¤å»ºè®®ï¼
void CompositorGpuThread::SubmitCompositorFrame(
mojo::PendingRemote<mojom::CompositorFrameMetadata> metadata) {
gpu_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(&CompositorGpuThread::ProcessFrameMetadata,
weak_factory_.GetWeakPtr(),
std::move(metadata)));
}
å½±ååæï¼
- 䏥鿧ï¼High
- å¯ä¿¡åº¦ï¼Confirmed
- å½±åèå´ï¼å¯è½å¯¼è´æ¸²æå´©æºææ°æ®ç«äº
审计æ»ç»
å ³é®åç°
- çå½å¨æç®¡çé®é¢ï¼å¤å¤å¼æ¥ä»»å¡ä½¿ç¨
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ä¼å ä¿®å¤å»ºè®®
-
ç«å³ä¿®å¤ï¼Criticalï¼ï¼
- æ¿æ¢ææå¼æ¥ä»»å¡ä¸ç
Unretained(this)为weak_factory_.GetWeakPtr() - ç¡®ä¿ææ GPU ç¸å ³æä½å¨ GPU çº¿ç¨æ§è¡
- æ¿æ¢ææå¼æ¥ä»»å¡ä¸ç
-
尽快修å¤ï¼Highï¼ï¼
- ç»ä¸ä½¿ç¨ PostTask 尿使éå°æ£ç¡®ç线ç¨
- ä¸ºå ³é®å¯¹è±¡æ·»å çº¿ç¨æ£æ¥ï¼DCHECKï¼
-
计åä¿®å¤ï¼Medium/Lowï¼ï¼
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- æ·»å åå æµè¯è¦çå¤çº¿ç¨åºæ¯
æ¶æå»ºè®®
- å¼å
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GUARDED_BYåSEQUENCE_CHECKER注解 - éæåæå¢å¼ºï¼é ç½® Clang-TIDY æ£æ¥çº¿ç¨å®å ¨é®é¢
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