x64dbg
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GleeBug
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Defer deleted breakpoints until step finishes

This commit is contained in:
Duncan Ogilvie 2026-07-18 12:17:48 +02:00
parent 53f93ca7ef
commit 6d37c95192
1 changed files with 14 additions and 4 deletions
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18
GleeBug/Debugger.Loop.cpp
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@ -1,5 +1,6 @@
#include "Debugger.h"
#include "Debugger.Thread.Registers.h"
#include <unordered_set>
#ifndef DBG_REPLY_LATER
#define DBG_REPLY_LATER ((NTSTATUS)0x40010001L)
@ -30,6 +31,7 @@ namespace GleeBug
DWORD ThreadBeingProcessed = 0;
std::unordered_map<DWORD, HANDLE> SuspendedThreads;
std::unordered_set<uint64_t> DeferredExceptionThreads;
bool IsDbgReplyLaterSupported = false;
// Check if DBG_REPLY_LATER is supported based on Windows version (Windows 10, version 1507 or above)
@ -67,10 +69,12 @@ namespace GleeBug
#endif
else
{
//after 2 consecutive timeouts, clear recently deleted breakpoints
//any stale events would have been delivered by now
// Do not expire deleted breakpoints while a breakpoint step-over is
// still in flight. The stepped instruction can block indefinitely and
// breakpoint events from the suspended threads remain pending until its
// single-step event arrives.
consecutiveTimeouts++;
if(consecutiveTimeouts >= 2 && mProcess)
if(consecutiveTimeouts >= 2 && ThreadBeingProcessed == 0 && SuspendedThreads.empty() && DeferredExceptionThreads.empty() && mProcess)
mProcess->recentlyDeletedSwbp.clear();
continue;
}
@ -78,6 +82,8 @@ namespace GleeBug
//event received, reset timeout counter
consecutiveTimeouts = 0;
const uint64_t eventThreadKey = (uint64_t(mDebugEvent.dwProcessId) << 32) | mDebugEvent.dwThreadId;
const bool completingDeferredException = DeferredExceptionThreads.count(eventThreadKey) != 0;
// Handle safe stepping
if(IsDbgReplyLaterSupported)
@ -87,7 +93,9 @@ namespace GleeBug
// Check if there is a thread processing a single step
if(ThreadBeingProcessed != 0 && mDebugEvent.dwThreadId != ThreadBeingProcessed)
{
// Reply to the event later
// Reply to the event later and retain its ownership state until
// the same thread's event is processed normally.
DeferredExceptionThreads.insert(eventThreadKey);
if(!ContinueDebugEvent(mDebugEvent.dwProcessId, mDebugEvent.dwThreadId, DBG_REPLY_LATER))
break;
@ -247,6 +255,8 @@ namespace GleeBug
//continue the debug event
if(!ContinueDebugEvent(mDebugEvent.dwProcessId, mDebugEvent.dwThreadId, mContinueStatus))
break;
if(completingDeferredException)
DeferredExceptionThreads.erase(eventThreadKey);
if(mDetach || mDetachAndBreak)
{