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!vadump

  • Artikkeli

The !vadump extension displays all virtual memory ranges and their corresponding protection information.

!vadump [-v]

Parameters

-v
Causes the display to include information about each original allocation region as well. Because individual addresses within a region can have their protection altered after memory is allocated (by VirtualProtect, for example), the original protection status for this larger region may not be the same as that of each range within the region.

DLL

Uext.dll

Additional Information

To view memory protection information for a single virtual address, use !vprot. For information about memory protection, see Microsoft Windows Internals by Mark Russinovich and David Solomon.

Remarks

Here is an example:

0:000> !vadump
BaseAddress:       00000000
RegionSize:        00010000
State:             00010000  MEM_FREE
Protect:           00000001  PAGE_NOACCESS

BaseAddress:       00010000
RegionSize:        00001000
State:             00001000  MEM_COMMIT
Protect:           00000004  PAGE_READWRITE
Type:              00020000  MEM_PRIVATE
.........

In this display, the State line shows the state of the memory range beginning at the specified BaseAddress. The possible state values are MEM_COMMIT, MEM_FREE, and MEM_RESERVE.

The Protect line shows the protection status of this memory range. The possible protection values are PAGE_NOACCESS, PAGE_READONLY, PAGE_READWRITE, PAGE_EXECUTE, PAGE_EXECUTE_READ, PAGE_EXECUTE_READWRITE, PAGE_WRITECOPY, PAGE_EXECUTE_WRITECOPY, and PAGE_GUARD.

The Type line shows the memory type. The possible values are MEM_IMAGE, MEM_MAPPED, and MEM_PRIVATE.

Here is an example using the -v parameter:

0:000> !vadump -v
BaseAddress:       00000000
AllocationBase:    00000000
RegionSize:        00010000
State:             00010000  MEM_FREE
Protect:           00000001  PAGE_NOACCESS

BaseAddress:       00010000
AllocationBase:    00010000
AllocationProtect: 00000004  PAGE_READWRITE
RegionSize:        00001000
State:             00001000  MEM_COMMIT
Protect:           00000004  PAGE_READWRITE
Type:              00020000  MEM_PRIVATE
.........

When -v is used, the AllocationProtect line shows the default protection that the entire region was created with. The Protect line shows the actual protection for this specific address.