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_HEAP_SEGMENT @ 30640 CommittedRange @ 30680 HEAP_ENTRY: Size : Prev Flags - UserPtr UserSize * 30680: 0303 : N/A [N/A] - 30688 (1800) - (busy) 31e98: 0014 : N/A [N/A] - 31ea0 (88) - (busy) 31f38: 0093 : N/A [N/A] - 31f40 (480) - (busy) 323d0: 0103 : N/A [N/A] - 323d8 (800) - (busy) msvcrt!_iob 32be8: 0007 : N/A [N/A] - 32bf0 (20) - (busy) 32c20: 000b : N/A [N/A] - 32c28 (3a) - (busy) 32c78: 000a : N/A [N/A] - 32c80 (32) - (busy) 32cc8: 0008 : N/A [N/A] - 32cd0 (26) - (busy) 32d08: 000a : N/A [N/A] - 32d10 (34) - (busy) 32d58: 000a : N/A [N/A] - 32d60 (38) - (busy) 32da8: 0009 : N/A [N/A] - 32db0 (2e) - (busy) 32df0: 000a : N/A [N/A] - 32df8 (36) - (busy) 32e40: 000b : N/A [N/A] - 32e48 (3a) - (busy) 32e98: 000b : N/A [N/A] - 32ea0 (32) - (busy) 32ef0: 0011 : N/A [N/A] - 32ef8 (70) - (busy) 32f78: 0010 : N/A [N/A] - 32f80 (62) - (busy) 32ff8: 0008 : N/A [N/A] - 33000 (28) - (busy) 33038: 0004 : N/A [N/A] - 33040 (8) - (busy) 09memleak!CSID::`vftable 33058: 000c : N/A [N/A] - 33060 (48) - (busy)
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As you can see, a lot of allocations with size 1c and 8 are being displayed What s even more interesting is that all allocations with size 8 have additional information associated with them More specifically, they show the following:
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33038: 0004 : N/A [N/A] - 33040 (8) - (busy) 09memleak!CSID::`vftable
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This is one of the really nice features of using the !heap extension command with the p switch Whenever a heap block is encountered, the !heap extension command tries to resolve the first DWORD of that block In our case, it resolves nicely to our CSID virtual function table (as we discovered earlier) The next command we will look at is the srch command The syntax of the command resembles the following:
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!heap -srch [-b|-w|-d|-q] PATTERN It scans all heap allocations and it searches for the given pattern The size of the pattern can be specified
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The srch command allows a search for particular patterns in all heap allocations This can come in really handy if we have an idea (or gut feeling) of what might be leaking Let s say that we wanted to see if any of the leaked blocks in the 09memleakexe process were leaking CSID instances The first thing we must do is find out the address to our virtual function table This can be done by using the X command (see 2), which allows us to resolve a symbolic name in one or more modules:
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0:001> X 01001e20 01001e60 01001d40 010012bc 09memleak!CSID* 09memleak!CSID::`scalar deleting destructor (void) 09memleak!CSID::~CSID (void) 09memleak!CSID::CSID (void *) 09memleak!CSID::`vftable = <no type information>
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The * is used as a wildcard The virtual function table is the last entry shown with an address of 010012bc Now we can use that address as part of the srch command:
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0:001> !heap -srch 010012bc _HEAP @ 30000 in HEAP_ENTRY: Size : Prev Flags - UserPtr UserSize 34f18: 0002 : N/A [N/A] - 34f20 (8) - (busy) 09memleak!CSID::`vftable _HEAP @ 30000 in HEAP_ENTRY: Size : Prev Flags - UserPtr UserSize 3ace0: 0002 : N/A [N/A] - 3ace8 (8) - (busy) 09memleak!CSID::`vftable _HEAP @ 30000 in HEAP_ENTRY: Size : Prev Flags - UserPtr UserSize 3ad18: 0002 : N/A [N/A] - 3ad20 (8) - (busy) 09memleak!CSID::`vftable _HEAP @ 30000 in HEAP_ENTRY: Size : Prev Flags - UserPtr UserSize 3ad50: 0002 : N/A [N/A] - 3ad58 (8) - (busy) 09memleak!CSID::`vftable _HEAP @ 30000 in HEAP_ENTRY: Size : Prev Flags - UserPtr UserSize 3ad88: 0002 : N/A [N/A] - 3ad90 (8) - (busy) 09memleak!CSID::`vftable _HEAP @ 30000 in HEAP_ENTRY: Size : Prev Flags - UserPtr UserSize 3adc0: 0002 : N/A [N/A] - 3adc8 (8) - (busy) 09memleak!CSID::`vftable _HEAP @ 30000 in HEAP_ENTRY: Size : Prev Flags - UserPtr UserSize 3adf8: 0002 : N/A [N/A] - 3ae00 (8) - (busy) 09memleak!CSID::`vftable
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