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I'd like to be able to point to a buffer in memory likely on the heap and have a tool tell me which part of the binary created the data in the file. What tools can do that for me?

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  • If the data is always at the same address, you could use a breakpoint at that address trough a debugger (Olly, Immunity, Cheat engine) and see what function accesses that part of the memory. If it has a dynamic address I'ld examine what's in that memory location, and try to figure out when/what put's it there. Start with setting a global breakpoint on memory related APIs. Mar 11 '15 at 20:53
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If you are using a debugger like gdb, you could set a hardware breakpoint at the heap address. From the gdb manual:

hbreak args

Set a hardware-assisted breakpoint. ... These targets will generate traps when a program accesses some data or instruction address that is assigned to the debug registers.

After setting a hardware breakpoint, the debugger will trap when the memory is accessed for a read or a write.

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If you are debugging PE executable (Windows), you can use the !heap -p options of WinDbg.

You can read about it here.

Note that you will have to enable it using gflags.exe - It's also mentioned in the document above.

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