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You can print out TEB information with the ! t e b command from WinDbg
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TES at 7ffdfaaa E x c eption L i s t : St a c k S a s e : St a c k Limit : S u bSystemT i b : F i be rDat a : Arbit ra ryUserPoint e r : Self : E n v i ronmentPo i n t e r : C l ie n t I d : RpcHandle : T I s Storage : P E S Add re s s : L a s t E r rorVa l u e : L a stSt a t u sVa l u e : Count Owned Loc k s : H a rd E r ro rMode : aaaee3a4 aa13aaaa aaaebaaa aaaaaaaa aaaaleaa aaaaaaaa 7ffdfaaa aaaaaaaa aaaa268c aaaaaaaa aaaaaaaa 7ffd baaa a c aaaaa34 a a
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By default ! t e b will print the active thread ' s TEB You can specify the address of another thread's TEB as an argument to ! t e b Addresses are printed alongside the threads when you run the WinDbg - command to show all threads in the process There is also a ! p e b command which prints related information that is stored at the process level instead of per thread
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Programmatically Accessing the TEB
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Sometimes it can be useful to access the TEB information from code To do so, Ntdlldll exports an undocumented function from W i n N T h
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PTES NtC u r rentTeb ( ) j
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The P T E B structure gives you direct access to the current thread's TEB This function returns you a PTE B, which is defined as _T E B * _T E B is an internal data structure defined in w i n t e r n l h, and consists of a bunch of byte arrays Directly accessing the raw _T E B structure is not recommended Instead, you can cast the PT E B to a PNT_T I B, which itself is defined in W inNT h as _NT _T I B * This data structure is not actually documented-meaning you can actually rely on it not breaking between versions of Windows-but it also provides access to the TEB's information in a strongly typed way
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Unfortunately, while you are given many of the more interesting fields, you can't access every single bit of information in the TEB via _NT_T I B
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typedef s t r u c t _NT_TI B { s t r u c t _EXC EPT ION_R EGISTRATION_RECORD * E x c e p t i o n L i s t j PVOID St a c k Ba s e j PVOID Stac k L imit j PVOID S u bSystemT i b j u n ion PVOID F i be rDat a j DWORD Ve r s ion j }j PVOID Arbit r a ryU s e rPointe r j s t r u c t _NT_TI B * S e l f j } NT_T I B , * PNT_T I B j
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As an example of using Nt C u r rentTeb, the following code simply prints out the current thread's stack base and limit
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PNT_TIB pTib reinterp ret_c a s t < PNT_TI B > ( Nt C u r rentTeb ( j printf ( " Ba s e % p , Limit %p \ r \ n " , pTib - >Sta c k B a s e , pTib - >Sta c k L imit ) j
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Believe it or not, this capability can come in useful For example, this kind of code can be used to determine whether a pointer refers to mem ory in the heap or the current thread's stack, simply by comparing it with the St a c k B a s e and St a c k L i mit from the TEB For additional ideas on what this capability can be used for, refer to Matt Pietrek's excellent Microsoft Systems Journal Articles in Further Reading (Pietrek, 1 996; 1 998)
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Accessing the TEB via the FS Register There's a shortcut to access the TEB You can always find a pointer to the current one in the register F S : [ 18h ] on X86 machines
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PNT_T I B pTi b j _a sm { mov eax , fs : [ 18h l mov pTi b , e a x } printf ( " Ba s e %p, Limit %p\r\ n " , pTi b - >Sta c k B a s e , p T i b - >Sta c k L imit ) j
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