Overview

Medium
Severity
CVSS
No
Exploited ITW
Fixed
Fix Status
ImpactOut of bounds memory access in DevTools
DescriptionOut of bounds memory access in DevTools
ComponentDevTools
Bug ClassOOB
Tracker409342999
Fix commitefc6a8a87933 (v8/v8) +1/-1
CISA KEVNot listed
CreditedAnonymous
Disclosed2025-04-29

Files Changed

  • src/debug/debug-scopes.cc
From efc6a8a8793300409aea280aa2fd792d5bb47b4c Mon Sep 17 00:00:00 2001
From: Igor Sheludko <[email protected]>
Date: Thu, 10 Apr 2025 14:19:58 +0200
Subject: [PATCH] [context] Fix handling of mutable heap numbers in debugger ^2

Fixed: 409342999
Change-Id: I49e73fc5c48542f8bf24f720f884b64c17b5fb01
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/6446613
Commit-Queue: Igor Sheludko <[email protected]>
Reviewed-by: Toon Verwaest <[email protected]>
Auto-Submit: Igor Sheludko <[email protected]>
Commit-Queue: Toon Verwaest <[email protected]>
Cr-Commit-Position: refs/heads/main@{#99743}
---

diff --git a/src/debug/debug-scopes.cc b/src/debug/debug-scopes.cc
index 04a5206..1d6ceb7 100644
--- a/src/debug/debug-scopes.cc
+++ b/src/debug/debug-scopes.cc
@@ -855,7 +855,7 @@
     if (v8_flags.script_context_mutable_heap_number &&
         context->IsScriptContext()) {
       value = indirect_handle(Context::LoadScriptContextElement(
-                                  context, it->index(), value, isolate_),
+                                  context, context_index, value, isolate_),
                               isolate_);
     }
     if (visitor(name, value, scope_type)) return true;
Loading diff…

Original Bug Report

reported by [email protected]

page crash after breakpoint and resume, and in other cases

Steps to reproduce the problem

  1. start Chrome
  2. run https://csynth.github.io/csynth/csynth.html
  3. open devtools/console
  4. type ‘init’ and enter
  5. devtools finds function init(), but the page crashes It may(?) work first time, but will crash on any repeated test after restart

Problem Description

Alternate related problem (probably same at root)

  1. start Chrome
  2. run https://csynth.github.io/csynth/csynth.html
  3. open devtools/console
  4. open JS/utils.js, line 4478, just after function init()
  5. put a breakpoint
  6. restart (F5 or browser)
  7. it will break at breakpoint
  8. resume, and it will crash the page Error code: STATUS_ACCESS_VIOLATION Works with chromium 133 Version 133.0.6943.142 (Official Build) (64-bit) Fails with Canary 137 Version 137.0.7116.0 (Official Build) canary (64-bit) Also fails using VS Code as the debugging host. Probably related to but not the same as https://issues.chromium.org/issues/399002824

Additional Comments

Chrome logo Google LLC Copyright 2025 Google LLC. All rights reserved. Google Chrome 135.0.7049.85 (Official Build) (64-bit) (cohort: Stable) Revision 1e112499da812a1dde62101ed601dcb93024aaff-refs/branch-heads/7049@{#1779} OS Windows 11 Version 24H2 (Build 26100.3476) JavaScript V8 13.5.212.10 User agent Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36 Command Line “C:\Program Files\Google\Chrome\Application\chrome.exe” –user-data-dir=“C:\Users\Mutator\AppData\Local\Organic\chromemydev” –remote-debugging-port=7654 –flag-switches-begin –flag-switches-end Executable Path C:\Program Files\Google\Chrome\Application\chrome.exe Profile Path C:\Users\Mutator\AppData\Local\Organic\chromemydev\Profile 1 Command-line variations 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g%2EPrediction%2EPreviousPrimaryPage/270/RedirectHeuristic%2ECookieAccess2/5/RedirectHeuristic%2ECookieAccessThirdParty2/5/Responsiveness%2EUserInteraction/70/SamesiteRedirectContextDowngrade/12/Security%2ESiteEngagement/35/ServiceWorker%2EMainResourceLoadCompleted/18/ServiceWorker%2EOnLoad/4/Site%2EInstall/8/Site%2EManifest/8/Site%2EQuality/8/SiteFamiliarityHeuristicResult/45/SiteInstance/6/SoftNavigation/10/SubresourceFilter/45/SubresourceLoad%2EZstdContentEncoding/850/TabManager%2ETabLifetime/4/TabRevisitTracker%2ETabStateChange/45/ThirdPartyCookies%2EBreakageIndicator%2EHTTPError/60/Translate/40/TranslatePageLoad/60/Unload/35/UserPerceivedPageVisit/120/V8%2EWasm/12/V8%2EWasm%2EModuleCompiled/V8%2EWasm/V8%2EWasm%2EModuleDecoded/V8%2EWasm/V8%2EWasm%2EModuleInstantiated/V8%2EWasm/WebOTPImpact/16/WindowProxyUsage/4/XR%2EWebXR/2/_default_sampling/1/_webdx_features_sampling/1,UseRustJsonParserInCurrentSequence.EnabledLaunch:UseRustJsonParserInCurrentSequence/true,WaitForLateScrollEvents.DispatchScrollEventsUntilDeadline_20250224Launch:mode/DispatchScrollEventsUntilDeadline” 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,*GetUserMediaDeferredDeviceSettingsSelection<CameraMicPreview,*HttpsFirstModeV2ForTypicallySecureUsers<HttpsFirstModeV2ForTypicallySecureUsers,ImprovedSettingsUIOnDesktop<UnoDesktopM0Followup,ImprovedSigninUIOnDesktop<UnoDesktopM0Followup,InitImageDecodeLastUseTime<InitImageDecodeLastUseTime,InputClosesSelect<CustomizableSelect,KeepAliveInBrowserMigration<KeepAliveInBrowserMigrationHoldback,*KeyboardLockPrompt<KeyboardLockPrompt,LayoutNGShapeCache<LayoutNGShapeCache,LowerHighResolutionTimerThreshold<BatterySaverModeAlignWakeUps,MacAllowBackgroundingRenderProcesses<PMProcessPriorityPolicy,*MaskedDomainList<IPProtectionPhase0,*MaskedDomainListFlatbufferImpl<IPProtectionMdlImpl,MetricsReporting<MetricsAndCrashSampling,MoveThemePrefsToSpecifics<MoveThemePrefsToSpecifics,NewContentForCheckerboardedScrolls<NewContentForCheckerboardedScrolls,OutlineSilhouetteIcon<UnoDesktopM0Followup,*OverridePrefetchOnSingleton<OverridePrefetchOnSingleton,PMProcessPriorityPolicy<PMProcessPriorityPolicy,*PartitionAllocEventuallyZeroFreedMemory<PartialPageZeroing,*PartitionProxyChains<IPProtectionPhase0,PartitionVisitedLinkDatabaseWithSelfLinks<PartitionVisitedLinkDatabaseWithSelfLinks,PassHistogramSharedMemoryOnLaunch<PassHistogramSharedMemoryOnLaunch,*PasswordFormGroupedAffiliations<PasswordFormGroupedAffiliations,*PasswordManualFallbackAvailable<PasswordManualFallbackAvailable_V2,PdfCr23<PdfCr23,*PdfInk2<PdfInkSignatures,PdfOopif<PdfOutOfProcessIframe,*PdfSearchify<PdfSearchify,*PreventDuplicateImageDecodes<SpeculativeImageDecodes,PriorityOverridePendingViews<PMProcessPriorityPolicy,PrivacySandboxAdsApiUxEnhancements<PrivacySandboxAdsApiUxEnhancements,PrivacySandboxEqualizedPromptButtons<PrivacySandboxEqualizedPromptButtons,*PrivacySandboxSentimentSurvey<PrivacySandboxSentimentSurvey,PwaNavigationCapturing<PWANavigationCapturingV2WindowMacLinux,QueueNavigationsWhileWaitingForCommit<RenderDocumentWithNavigationQueueing,QuicDoesNotUseFeatures<QUIC,RasterInducingScroll<RasterInducingScroll,*ReadAnythingReadAloud<ReadAnythingReadAloudDesktop,*RecordFreezingEligibilityUKM<RecordFreezingEligibilityUKM,RemoveRendererProcessLimit<RemoveRendererProcessLimit,RenderDocument<RenderDocumentWithNavigationQueueing,*ResamplingScrollEventsExperimentalPrediction<ResamplingScrollEvents,*SafeBrowsingHashPrefixRealTimeLookupsSamplePing<ExtendedReportingRemovePrefDependency,SafetyHubServicesOnStartUp<SafetyHubServicesOnStartUp,SelectParserRelaxation<CustomizableSelect,*SendExplicitDecodeRequestsImmediately<SpeculativeImageDecodes,SendTabToSelfIOSPushNotifications<SendTabToSelfIOSPushNotifications,SharingDisableVapid<SharingDisableVapid,*SiteInstanceGroupsForDataUrls<SiteInstanceGroupsForDataUrls,*SkipTpcdMitigationsForAds<CookieDeprecationFacilitatedTestingCookieDeprecation,SpeculativeFixForServiceWorkerDataInDidStartServiceWorkerContext<SpeculativeFixForServiceWorkerDataInDidStartServiceWorkerContext,*SpeculativeImageDecodes<SpeculativeImageDecodes,StopExportDFCMetrics<StopExportDFCMetricsExperiment,SyncAutofillWalletCredentialData<AutofillEnableCvcStorage,*TPCDAdHeuristicSubframeRequestTagging<CookieDeprecationFacilitatedTestingCookieDeprecation,*ThrottleFrameRateOnManyDidNotProduceFrame<ThrottleFrameRateOnManyDidNotProduceFrame,*TrackingProtectionContentSettingUbControl<IPProtectionPhase0,TrustSafetySentimentSurveyV2<TrustSafetySentimentSurveyV2,UMAPseudoMetricsEffect<UMA-Pseudo-Metrics-Effect-Injection-25-Percent,Ukm<UKM,UkmSamplingRate<UkmSamplingRate,*UseNewEncryptionMethod<NewOSCryptAlgorithmForPasswords,UseRustJsonParser<UseRustJsonParserInCurrentSequence,V8Flag_minor_gc_task_with_lower_priority<V8MinorGcTaskWithLowerPriority,*V8Flag_zero_unused_memory<PartialPageZeroing,*V8GCSpeedUsesCounters<V8GCSpeedUsesCounters,WaitForLateScrollEvents<WaitForLateScrollEvents,WebAudioBypassOutputBuffering<WebAudioBypassOutputBuffering,*WebAuthnUsePasskeyFromAnotherDeviceInContextMenu<WebAuthnUsePasskeyFromAnotherDeviceInContextMenu,WebContentsDiscard<WebContentsDiscard" –disable-features=“AutofillUseNLAddressModel<AutofillI18nNLAddressModel,Canvas2DHibernation<CanvasHibernationExperiments,Canvas2DHibernationReleaseTransferMemory<CanvasHibernationExperiments,ClearCanvasResourcesInBackground<CanvasHibernationExperiments,DelayLayerTreeViewDeletionOnLocalSwap<RenderDocumentWithNavigationQueueing,EvictionUnlocksResources<CanvasHibernationExperiments,ExtensionManifestV3NetworkSpeechSynthesis<ExtensionManifestV3NetworkSpeechSynthesis,FledgeBiddingAndAuctionNonceSupport<FledgeBiddingAndAuctionNonceSupport,FledgeConsiderKAnonymity<ProtectedAudiencesKAnonymityEnforcementStudy,FledgeEnforceKAnonymity<ProtectedAudiencesKAnonymityEnforcementStudy,FledgeQueryKAnonymity<ProtectedAudiencesKAnonymityEnforcementStudy,IgnoreInputWhileHidden<IgnoreInputWhileHiddenKillswitch,MediaFoundationUseSWBRCForH264Camera<ExternalRateControlForMediaFoundationVideoEncoder,ProgressiveAccessibility<ProgressiveAccessibility,RenderDocumentCompositorReuse<RenderDocumentWithNavigationQueueing,ScrimForTabModal<ScrimForTabModal” –disable-field-trial-config Active variations 2b978349-ca7d8d80 89986dbe-ca7d8d80 f2f17cec-377be55a d992c558-ca7d8d80 cae5a6b5-377be55a f69863c5-8d55def 7651c438-ca7d8d80 d0d3d7ff-3f4a17df f73edf58-ca7d8d80 bc06eaa3-6edc92c7 147c5d66-cdbea37c 48a8d64c-ca7d8d80 94e21eca-ca7d8d80 73b87075-ca7d8d80 dc88470b-377be55a 13427e22-ca7d8d80 6b7d4090-ca7d8d80 2dbe7f3c-377be55a 95988a12-ca7d8d80 c66576a2-d5b56580 3095aa95-3f4a17df e0a545c4-37b6594d 3843461e-377be55a 40c9a7b-ca7d8d80 a2380a9-377be55a 999e8980-d01d38ed 7faa7be9-ca7d8d80 4505a270-989f556b ce4a99f0-ca7d8d80 efcaf4ba-ca7d8d80 f314f5b9-dc419c93 1632add8-ca7d8d80 7840af09-8fc53d61 aad6b02b-377be55a 5e4b4ebb-ca7d8d80 3779be93-ca7d8d80 8c6d6f42-ca7d8d80 1b5a61aa-ca7d8d80 a582a1b8-5ad3f43d d7ce3099-ca7d8d80 ea5cba78-1f8c5973 bd6dd170-ca7d8d80 780df7d2-ca7d8d80 55920447-ca7d8d80 a05c89eb-ca7d8d80 87684b46-ca7d8d80 6e355c92-ca7d8d80 7acc67ee-377be55a 73f1e332-19126bc2 8b726c45-ca7d8d80 3c978b59-ca7d8d80 255aa854-21e50b34 9cf6c713-82ce9fda fcbc56b-f9a43703 5a24997e-377be55a 7feffab5-b8233f1b ac900222-ca7d8d80 96d006a-ca7d8d80 c2d7a2b1-ca7d8d80 f42905ff-12ede6a2 71c14987-f66697fa ab469038-3fa75b73 ffb16e71-3fa75b73 d04c006a-9d446b22 cf59983-cc4e1a9d f000894b-3fa75b73 9cafc262-9d446b22 ad9b71e2-ca7d8d80 5e3a236d-603bc464 7aed4fe4-377be55a d43ddfd9-e36235cc 13080a68-37b6594d 17196951-377be55a 13250fa3-ca7d8d80 f7b9a9e3-ca7d8d80 4b82c9ff-ca7d8d80 c88fa1e2-ca7d8d80 56aa5797-ca7d8d80 b602fc3f-ca7d8d80 265c01cc-91fa8391 e900a5ae-ca7d8d80 eef5d69a-ca7d8d80 136ff6f9-377be55a 4076100b-6edc92c7 a9795cfe-ca7d8d80 c861514b-377be55a 68fef0c-e842c7eb 868b8811-ca7d8d80 59a12fbe-c486d7d0 633b8aa8-ca7d8d80 ed2195eb-ca7d8d80 12043b46-128ddea9 7c0e4650-ca7d8d80 17ddb1b6-ca7d8d80 d5954b6b-92ead762 2be5fc80-ca7d8d80 66b7a83f-ca7d8d80 fa2e3194-54776cd1 f3f1bfdb-377be55a d721a76b-ca7d8d80 4ea303a6-2b3ebda7 79a319d6-377be55a 19593c6e-ca7d8d80 f3b6291d-6bb2bb3c 1edcddf4-659d13d5 663ec21b-6edc92c7 4a5e2995-ca7d8d80 ee06384e-1f8c5973 79d7856f-377be55a ea0d881d-ca7d8d80 b6f29041-ca7d8d80 2bac9a6a-33c3eba5 e85106e5-ca7d8d80 ced7ce3e-ca7d8d80 c046d00b-ca7d8d80 3c68162d-377be55a 8e8365ea-ca7d8d80 6ef0294d-34edeffa 52a20523-ca7d8d80 d0083347-ca7d8d80 d384e2ea-377be55a f9675edd-1be7e586 6174e731-ca7d8d80 90860314-18b4e153 494d8760-52325d43 eadcacdf-6bdfffe7 673e0287-6bdfffe7 3ac60855-486e2a9c f48c01d3-3d9c626c 63dcb6a3-ffb76a70 e706e746-a4c33fb f296190c-eaceac83 4442aae2-4ad60575 f690cf64-6e597ede ed1d377-e1cc0f14 75f0f0a0-d7f6b13c 710c3f90-e1cc0f14 e2b18481-4ad60575 e7e71889-4ad60575 3a8271ac-e9e131c 97c42540-377be55a 2cda667c-377be55a bea4a9c2-adaded76 92c76c82-ca7d8d80 72ee2098-377be55a d89640a1-ca7d8d80 762e8080-277b1d15 9a0df95c-377be55a 49171648-3f4a17df b357b792-dcf2ae30 f4f00e05-ca7d8d80 9481ce98-3f4a17df a983f698-3dc07a40 2a426c03-3d47f4f4 70678518-206f6a6e be338734-7c9424a1 5f9907a9-206f6a6e 8eeccb9a-c35b209e 2b465683-3601ad67 52fc7926-fe672c53 bc9b361d-dee66fa8 a41a7188-42cfaffb ff71bfdc-dee66fa8 e7cc79d5-dee66fa8 4b935545-3d47f4f4 9a38bae3-6046c8a7 41ad04e1-e4065f40 2d1e43a3-3d47f4f4 386dc267-3d47f4f4 f1d93dee-ca7d8d80 d69d967d-3695c92e

Summary

page crash after breakpoint and resume, and in other cases

Additional Data

Category: Developer Tools
Chrome Channel: Stable
Regression: Yes

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