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fix: ensure write-only breakpoints trigger on Copy-on-Write pages 

- Replaced the implicit bit-shift logic with an explicit mapping
to prevent the OS from silently duplicating pages via Copy-on-Write.

- Added explicit cases for PAGE_WRITECOPY and PAGE_EXECUTE_WRITECOPY.
This commit is contained in:
Rafael 2026-03-28 12:03:17 +00:00
parent e6570203cc
commit ebdc74d23b
1 changed files with 6 additions and 2 deletions
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8
TitanEngine/Global.Breakpoints.cpp
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@ -251,13 +251,17 @@ DWORD GetPageProtectionForMemoryBreakpoint(const MemoryBreakpointPageDetail & pa
if(page.writeBps > 0) if(page.writeBps > 0)
{ {
// Remove write access e.g. PAGE_EXECUTE_READWRITE => PAGE_EXECUTE // Remove write access (and copy-on-write) e.g. PAGE_EXECUTE_READWRITE => PAGE_EXECUTE
DWORD dwBase = newProtect & 0xFF; DWORD dwBase = newProtect & 0xFF;
switch(dwBase) switch(dwBase)
{ {
case PAGE_READWRITE: case PAGE_READWRITE:
case PAGE_WRITECOPY:
newProtect = (newProtect & 0xFFFFFF00) | PAGE_READONLY;
break;
case PAGE_EXECUTE_READWRITE: case PAGE_EXECUTE_READWRITE:
newProtect = (newProtect & 0xFFFFFF00) | (dwBase >> 1); case PAGE_EXECUTE_WRITECOPY:
newProtect = (newProtect & 0xFFFFFF00) | PAGE_EXECUTE_READ;
break; break;
} }
} }