INTRODUCTION TO THE DEBUGGERS in Software

Generate QR in Software INTRODUCTION TO THE DEBUGGERS
2 INTRODUCTION TO THE DEBUGGERS
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VOID _cdecl main( ULONG argc, PCHAR argv[] )
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In Listing 234, we use several forms of the display command to inspect the commandline parameters passed in the argv[] array after setting a breakpoint in 02sample!wmain function Listing 234 Use of d command
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0:000> bp 02sample!wmain 0:000> g Breakpoint 0 hit 0:000> * Get the address of argv parameter 0:000> dv /V argv 0006ff68 @ebp+0x0c argv = 0x005f0ea0 0:000> * Dump 4 double words at argv address 0:000> dc 0x005f0ea0 l4 005f0ea0 005f0eb4 005f0efe 005f0f08 005f0f12 ____ 0:000> dd 0x005f0ea0 005f0ea0 005f0eb4 005f0efe 005f0f08 005f0f12 0:000> * Dump one Unicode string 0:000> du 005f0eb4 005f0eb4 c:\AWDBIN\WinXPx86chk\02sample 005f0ef4 exe 0:000> * Dump one Unicode string as ASCI string
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2
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Introduction to the Debuggers
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Listing 234 Use of d command (continued)
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0:000> da 005f0eb4 005f0eb4 c 0:000> * Dump four bytes as byte array 0:000> db 005f0eb4 l4 005f0eb4 63 00 3a 00 c: 0:000> * Dump four bytes in binary format 0:000> * The heading line represent the bit position 0:000> dyb 005f0eb4 l4 76543210 76543210 76543210 76543210 005f0eb4 01100011 00000000 00111010 00000000 63 00 3a 00 0:000> * Dump four double words in binary format 0:000> dyd 005f0eb4 l4 3 2 1 0 10987654 32109876 54321098 76543210 005f0eb4 00000000 00111010 00000000 01100011 003a0063 005f0eb8 00000000 01000001 00000000 01011100 0041005c 005f0ebc 00000000 01000100 00000000 01010111 00440057 005f0ec0 00000000 01001001 00000000 01000010 00490042 0:000> * Dump four float numbers 0:000> df 005f0eb4 l4 005f0eb4 53265975e-039 59694362e-039 62449357e-039 67040837e-039 0:000> * Dump four words numbers 0:000> dw 005f0eb4 l4 005f0eb4 0063 003a 005c 0041 0:000> * Dump four float numbers with the character representation 0:000> dW 005f0eb4 l4 005f0eb4 0063 003a 005c 0041 c:\A 0:000> * Dump an invalid memory address 0:000> dc 0 l4 00000020
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In the listing, the nonprintable characters are displayed as dots () This can be a bit confusing when the block really does contain dots At other times, the debugger displays just a stream of question marks ( ) that represent, well nothing The address is not valid, and the debugger cannot read anything from that address because the address is not mapped in the target process After selecting option 6, we use thread zero to exemplify other forms of this command The next form is used to dump the memory area, as well as to treat each element in memory as a symbol and to resolve it There are three forms of this command, generically referred to as d*s commands: dds treats each group of four bytes
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Basic Debugger Tasks
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as a symbol; dqs treats each group of eight bytes as a symbol; whereas dps uses the length most appropriate for the processor architecture being debugged Listing 235 shows an example of using this command over some stack memory Listing 235 Use of d*s command
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0:000> dps esp l8 0005fcb4 010017ab 02sample!KBTest::Fibonacci_stdcall+0x2b 0005fcb8 00000001 0005fcbc 00000000 0005fcc0 0006fcd4 0005fcc4 010017d0 02sample!KBTest::Fibonacci_stdcall+0x50
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The last form is similar to the d*s command The debugger iterates over the memory area considering it as a sequence of 32- or 64-bit pointers, as the d*s command discussed previously does It uses each value read from the memory area as a pointer to a different data type, which is subsequently displayed using the type specific format Not convinced, or confused about the usefulness of this At the debugger prompt used in Listing 234, we use this option to display an array of Unicode strings representing the debugger target command-line arguments
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0:000> * Dump an array of UNICODE strings 0:000> dpu 0x005f0ea0 L4 005f0ea0 005f0eb4 c:\AWDBIN\WinXPx86chk\02sampleexe 005f0ea4 005f0efe arg1 005f0ea8 005f0f08 arg2 005f0eac 005f0f12 arg3
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2 INTRODUCTION TO THE DEBUGGERS
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This form of command is also highly effective when acting over an unknown memory area The s command, which stands for search, is another effective command to discover known values in the debugger target memory The command accepts the searched type and the search value as parameters The next listing demonstrates the usage of the s command to search an exception code in the process memory The next listing is captured after selecting the option 1 in 02sampleexe The s command searches a double-word value in the first 265MB from the virtual address space
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0:000> * Run 0:000> g (53a84070): eax=00000000 eip=010016d0 the debugger target after the access violation exception Access violation - code c0000005 (!!! second chance !!!) ebx=00000000 ecx=01003008 edx=01003008 esi=00000001 edi=0100373c esp=0006ff34 ebp=0006ff38 iopl=0 nv up ei pl nz na pe nc
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