dr_query_memory_ex() should not fail on kernel memory

From m...@google.com on September 10, 2014 05:27:53

My config: Win 8.1 x64, using DynamoRIO for 32-bit processes DynamoRIO version: 4.2.2725

When I call dr_query_memory_ex() with 0x7fff0000 (== MmUserProbeAddress) as an argument it fails (returns false). There's no info in documentation about the function behavior if we pass kernel memory address as an argument. There's no way to retrieve MmUserProbeAddress from user mode, so now the only way to enumerate process memory is to ignore memory regions where dr_query_memory_ex() fails, but that looks like an ugly hack (I can miss other issues by silencing the error). The proposition from Derek was to return DR_MEMTYPE_KERNEL for kernel memory regions, which should solve the problem.

Original issue: http://code.google.com/p/dynamorio/issues/detail?id=1538