Windows x64 Changes in Software

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Windows x64 Changes
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stack That can use up the available stack fairly easily, and it represents a problem that must be explicitly addressed in highly reliable applications The typical C++ exception code exhibiting this problem is shown in the following fragment We recommend removing any such construct from commercial code and replacing it with other cleanup patterns such as a Resource Acquisition Is Initialization pattern
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catch( ) { //Cleanup throw(); }
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5 Memory Corruptions Part I Stacks
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5, Memory Corruptions Part I Stacks, is entirely dependent on the processor architecture The current chapter is all about the new processor architecture, and most of the time, it covers the differences between x86 and x64 architectures Most debugging scenarios presented earlier are valid after considering the calling convention used by Windows x64, presented in the section What Is the Current Call Stack
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6 Memory Corruptions Part II Heaps
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6, Memory Corruptions Part II Heaps, uses various commands and techniques dependent on the x86 processor s architecture As within the previous section, the information presented so far should be enough to investigate most scenarios described in this chapter The scenarios in 6 rely heavily on heap structures that are slightly different in Windows x64 All structures that contain pointers and sizes are adjusted to hold 64-bit values As an example, the next listing shows the _HEAP_ENTRY structure for 64-bit heaps
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12 64-BIT DEBUGGING
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0:000> dt +0x000 +0x008 +0x00a +0x00c +0x00d +0x00e +0x00f +0x008 ntdll!_HEAP_ENTRY 0000000000080000 PreviousBlockPrivateData : (null) Size : 0xc5 PreviousSize : 0 SmallTagIndex : 0xb9 Flags : 0x1 UnusedBytes : 0 SegmentIndex : 0 CompactHeader : 0x1b9`000000c5
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12
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64-Bit Debugging
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Note that processes running applications in WOW64 have two types of heaps The native process contains at least one heap, the process heap, organized as a 64-bit heap, whereas the application itself can have multiple heaps organized as 32-bit heaps The !heap extension command, used without parameters, shows the list of heaps created in the process by inspecting the process environment blocks As with the !peb extension command, the !heap extension command is unable to find 32-bit PEB, and it cannot show the heaps in WOW64 applications when using a native debugger Special attention must be paid to enabling the Application Verifier tool, as explained in the section 1 Introduction to the Tools, in order to obtain the desired results
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7 Security
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All security concepts used in Windows x86 are applicable without any change in Windows x64 Nothing has changed in the way the security principals are identified by the operating system or in the way each object is secured The access control is performed using the same mechanisms used in Windows x86 but accepting arguments matching the architecture pointer size Listing 1216 shows the typical usage of the most commonly used command in the security area that is different in Windows x64 In this listing, captured from a kernel mode debugger connected to a Windows x64 system, we examine the security descriptor protecting the winlogonexe process, as well as the token under which the process executes Listing 1216
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Security information on Windows x64
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1: kd> !process 0 1 winlogonexe PROCESS fffffadfe74010f0 SessionId: 0 Cid: 02dc Peb: 7fffffd4000 ParentCid: 0268 DirBase: 351de000 ObjectTable: fffffa8000b74f90 HandleCount: 691 Image: winlogonexe VadRoot fffffadfe73780f0 Vads 179 Clone 0 Private 3088 Modified 2148 Locked 0 DeviceMap fffffa80000027d0 Token fffffa8000742060 ElapsedTime 2 Days 12:02:23296 UserTime 00:00:00546 KernelTime 00:00:00906 CommitCharge 3666 1: kd> !object fffffadfe74010f0
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Object: fffffadfe74010f0 Type: (fffffadfe7afcd40) Process ObjectHeader: fffffadfe74010c0 HandleCount: 13 PointerCount: 363 1: kd> dt nt!_OBJECT_HEADER fffffadfe74010c0 +0x000 PointerCount : 363 +0x008 HandleCount : 13 +0x008 NextToFree : 0x00000000`0000000d +0x010 Type : 0xfffffadf`e7afcd40 _OBJECT_TYPE +0x018 NameInfoOffset : 0 +0x019 HandleInfoOffset : 0 +0x01a QuotaInfoOffset : 0 +0x01b Flags : 0x20 +0x020 ObjectCreateInfo : 0xfffff800`011d2f00 _OBJECT_CREATE_INFORMATION +0x020 QuotaBlockCharged : 0xfffff800`011d2f00 +0x028 SecurityDescriptor : 0xfffffa80`000037d6 +0x030 Body : _QUAD 1: kd> * The address of the security descriptor 1: kd> !sd (poi(fffffadfe74010f0-8)&0xffffffff`fffffff0) 1: kd> !sd (0xfffffa80`000037d6&0xffffffff`fffffff0) ->Revision: 0x1 ->Sbz1 : 0x0 ->Control : 0x8004 SE_DACL_PRESENT SE_SELF_RELATIVE ->Owner : S-1-5-32-544 ->Group : S-1-5-18 ->Dacl : ->Dacl : ->Ace[1]: ->SID: S-1-5-32-544 ->Sacl : is NULL
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1: kd> !token fffffa8000742060 _TOKEN fffffa8000742060 TS Session ID: 0 User: S-1-5-18 Groups: 00 S-1-5-32-544 Attributes - Default Enabled Owner RestrictedSidCount: 0 RestrictedSids: 0000000000000000 OriginatingLogonSession: 0
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