Обратный инжиниринг SEH: почему мой ИДЕНТИЧНЫЙ код ассемблера не работает как оригинал?
Я пытаюсь реконструировать обработчик SEH Visual C ++ 2008 с именем __ CxxFrameHandler3 , чтобы предоставить реализацию, которая может делегировать результат ( более старая версия) __ CxxFrameHandler в msvcrt.dll .
( Эта страница и эта страница содержит подробную информацию о msvcrt.dll и SEH.)
Примечание: msvcrt_winxp.obj (32-разрядная версия) и msvcrt_win2003.obj (64-разрядная версия) уже делают то же самое - они являются частью Windows Driver Kit 7.1 . Однако они также связаны с большим количеством другого кода, что портит мой компоновщик.
Мне удалось дизассемблировать 32-битную версию ( msvcrt_winxp.obj ), извлечь __ CxxFrameHandler3 и создать альтернативу, обеспечивающую соответствующую реализацию.
Однако у меня возникла проблема с 64-битной версией ( msvcrt_win2003.obj ):
Хотя моя 64-битная реализация выглядит точно так же, она не работает - - но тот, который предоставлен Microsoft, действительно работает.
Это 32-разрядная версия (которая работает правильно ):
.386
.model flat, c
option dotname
extern __CxxFrameHandler: PROC
.code
includelib msvcrt.lib
public __CxxFrameHandler3
__CxxFrameHandler3:
push ebp
mov ebp,esp
sub esp,28h
push ebx
push esi
push edi
cld
mov dword ptr [ebp-4],eax
mov esi,dword ptr [ebp-4]
push 9
pop ecx
lea edi,[ebp-28h]
rep movs dword ptr es:[edi],dword ptr [esi]
mov eax,dword ptr [ebp-28h]
and eax,0F9930520h
or eax,019930520h
mov dword ptr [ebp-28h],eax
lea eax,[ebp-28h]
mov dword ptr [ebp-4],eax
push dword ptr [ebp+14h]
push dword ptr [ebp+10h]
push dword ptr [ebp+0Ch]
push dword ptr [ebp+8]
mov eax,dword ptr [ebp-4]
call __CxxFrameHandler
add esp,10h
pop edi
pop esi
pop ebx
mov esp,ebp
pop ebp
ret
end
Это (проблемная) 64-разрядная версия:
;; Compiled with:
;; ml64.exe /Fo"$(InputName).obj" /c /nologo /W3 /Zi /Ta "$(InputPath)"
option dotname
extern __CxxFrameHandler: PROC
extern __imp___CxxFrameHandler: PROC
extern __imp_VirtualProtect: PROC
extern __imp_Sleep: PROC
extern __imp_GetVersion: PROC
.data
ProtectFlag dd ?
.code
includelib kernel32.lib
includelib msvcrt.lib
public __CxxFrameHandler3
__CxxFrameHandler3:
mov rax,rsp
mov qword ptr [rax+8],rbx
mov qword ptr [rax+10h],rbp
mov qword ptr [rax+18h],rsi
push rdi
push r12
push r13
sub rsp,30h
mov dword ptr [rax+20h],40h
mov rax,qword ptr [r9+38h]
mov rdi,r9
mov ebx,dword ptr [rax]
mov rsi,r8
mov rbp,rdx
add rbx,qword ptr [r9+8]
mov r12,rcx
mov eax,dword ptr [rbx]
and eax,1FFFFFFFh
cmp eax,19930520h
je L140001261
mov r13d,1
mov eax,r13d
lock xadd dword ptr [ProtectFlag],eax
add eax,r13d
cmp eax,r13d
je L140001217
L1400011F0:
lock add dword ptr [ProtectFlag],0FFFFFFFFh
mov ecx,0Ah
call qword ptr [__imp_Sleep]
mov r11d,r13d
lock xadd dword ptr [ProtectFlag],r11d
add r11d,r13d
cmp r11d,r13d
jne L1400011F0
L140001217:
mov r8d,dword ptr [rsp+68h]
mov r13d,4
lea r9,[rsp+20h]
mov rdx,r13
mov rcx,rbx
call qword ptr [__imp_VirtualProtect]
test eax,eax
je L140001259
and dword ptr [rbx],0F9930520h
or dword ptr [rbx],19930520h
mov r8d,dword ptr [rsp+20h]
lea r9,[rsp+68h]
mov rdx,r13
mov rcx,rbx
call qword ptr [__imp_VirtualProtect]
L140001259:
lock add dword ptr [ProtectFlag],0FFFFFFFFh
L140001261:
mov r9,rdi
mov r8,rsi
mov rdx,rbp
mov rcx,r12
call qword ptr [__imp___CxxFrameHandler]
mov rbx,qword ptr [rsp+50h]
mov rbp,qword ptr [rsp+58h]
mov rsi,qword ptr [rsp+60h]
add rsp,30h
pop r13
pop r12
pop rdi
ret
end
Реализация Microsoft (извлечена с помощью DumpBin ] на lib \ wnet \ amd64 \ msvcrt_win2003.obj ):
__CxxFrameHandler3:
0x0000: 48 8B C4 mov rax,rsp
0x0003: 48 89 58 08 mov qword ptr [rax+8],rbx
0x0007: 48 89 68 10 mov qword ptr [rax+10h],rbp
0x000B: 48 89 70 18 mov qword ptr [rax+18h],rsi
0x000F: 57 push rdi
0x0010: 41 54 push r12
0x0012: 41 55 push r13
0x0014: 48 83 EC 30 sub rsp,30h
0x0018: C7 40 20 40 00 00 mov dword ptr [rax+20h],40h
00
0x001F: 49 8B 41 38 mov rax,qword ptr [r9+38h]
0x0023: 49 8B F9 mov rdi,r9
0x0026: 8B 18 mov ebx,dword ptr [rax]
0x0028: 49 8B F0 mov rsi,r8
0x002B: 48 8B EA mov rbp,rdx
0x002E: 49 03 59 08 add rbx,qword ptr [r9+8]
0x0032: 4C 8B E1 mov r12,rcx
0x0035: 8B 03 mov eax,dword ptr [rbx]
0x0037: 25 FF FF FF 1F and eax,1FFFFFFFh
0x003C: 3D 20 05 93 19 cmp eax,19930520h
0x0041: 0F 84 8A 00 00 00 je 0x00D1
0x0047: 41 BD 01 00 00 00 mov r13d,1
0x004D: 41 8B C5 mov eax,r13d
0x0050: F0 0F C1 05 00 00 lock xadd dword ptr [?ProtectFlag@?1??__CxxFrameHandler3@@9@9],eax
00 00
0x0058: 41 03 C5 add eax,r13d
0x005B: 41 3B C5 cmp eax,r13d
0x005E: 74 27 je 0x0087
0x0060: F0 83 05 00 00 00 lock add dword ptr [?ProtectFlag@?1??__CxxFrameHandler3@@9@9],0FFFFFFFFh
00 FF
0x0068: B9 0A 00 00 00 mov ecx,0Ah
0x006D: FF 15 00 00 00 00 call qword ptr [__imp_Sleep]
0x0073: 45 8B DD mov r11d,r13d
0x0076: F0 44 0F C1 1D 00 lock xadd dword ptr [?ProtectFlag@?1??__CxxFrameHandler3@@9@9],r11d
00 00 00
0x007F: 45 03 DD add r11d,r13d
0x0082: 45 3B DD cmp r11d,r13d
0x0085: 75 D9 jne 0x0060
0x0087: 44 8B 44 24 68 mov r8d,dword ptr [rsp+68h]
0x008C: 41 BD 04 00 00 00 mov r13d,4
0x0092: 4C 8D 4C 24 20 lea r9,[rsp+20h]
0x0097: 49 8B D5 mov rdx,r13
0x009A: 48 8B CB mov rcx,rbx
0x009D: FF 15 00 00 00 00 call qword ptr [__imp_VirtualProtect]
0x00A3: 85 C0 test eax,eax
0x00A5: 74 22 je 0x00C9
0x00A7: 81 23 20 05 93 F9 and dword ptr [rbx],0F9930520h
0x00AD: 81 0B 20 05 93 19 or dword ptr [rbx],19930520h
0x00B3: 44 8B 44 24 20 mov r8d,dword ptr [rsp+20h]
0x00B8: 4C 8D 4C 24 68 lea r9,[rsp+68h]
0x00BD: 49 8B D5 mov rdx,r13
0x00C0: 48 8B CB mov rcx,rbx
0x00C3: FF 15 00 00 00 00 call qword ptr [__imp_VirtualProtect]
0x00C9: F0 83 05 00 00 00 lock add dword ptr [?ProtectFlag@?1??__CxxFrameHandler3@@9@9],0FFFFFFFFh
00 FF
0x00D1: 4C 8B CF mov r9,rdi
0x00D4: 4C 8B C6 mov r8,rsi
0x00D7: 48 8B D5 mov rdx,rbp
0x00DA: 49 8B CC mov rcx,r12
0x00DD: FF 15 00 00 00 00 call qword ptr [__imp___CxxFrameHandler]
0x00E3: 48 8B 5C 24 50 mov rbx,qword ptr [rsp+50h]
0x00E8: 48 8B 6C 24 58 mov rbp,qword ptr [rsp+58h]
0x00ED: 48 8B 74 24 60 mov rsi,qword ptr [rsp+60h]
0x00F2: 48 83 C4 30 add rsp,30h
0x00F6: 41 5D pop r13
0x00F8: 41 5C pop r12
0x00FA: 5F pop rdi
0x00FB: C3 ret
Когда я пытаюсь отладить оба формата, , как только я дойду до строки, которая говорит , нажмите r12 , стек вызовов в Visual Studio становится беспорядочным в моей версии (между кадрами стека появляются поверхностные записи, указывающие на недопустимые адреса), но при этом совершенно нормально точка в версии Microsoft.
И действительно, когда я разрешаю продолжить выполнение, моя программа вылетает внутри __ CxxFrameHandler с моей версией, но полностью работает с версией Microsoft.
Я тестирую оба источника программы:
int main()
{
try
{
// Dummy condition to prevent any optimizations.
// Always throws.
if (GetVersion() != 0)
throw 1;
}
catch (...) { }
if (GetVersion() != 0) { _tprintf(_T("Hi!\n")); }
return 0;
}
с соответствующими флагами компилятора ( / MD / GS- / Od ).
Поэтому я не могу понять:
Почему мой код, который должен быть в точности таким же, как и предоставленная реализация, вызвать нарушение прав доступа внутри msvcrt 's __ CxxFrameHandler ?
Здесь находится кодировка программ base64, так что вы можете видеть фактические сгенерированные двоичные файлы.
Моя плохая версия:
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Версия Microsoft:
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Изменить:
Для тех, кому интересно, я нашел решение благодаря ссылке Раймонда.
Оказалось, что мне нужно заменить
__CxxFrameHandler3:
mov rax,rsp
mov qword ptr [rax+8],rbx
mov qword ptr [rax+10h],rbp
mov qword ptr [rax+18h],rsi
push rdi
push r12
push r13
sub rsp,30h
mov dword ptr
; more code
на
__CxxFrameHandler3 proc frame
mov rax,rsp
mov qword ptr [rax+8],rbx
.savereg rbx, 50h
mov qword ptr [rax+10h],rbp
.savereg rbp, 58h
mov qword ptr [rax+18h],rsi
.savereg rsi, 60h
push rdi
.pushreg rdi
push r12
.pushreg r12
push r13
.pushreg r13
sub rsp,30h
.allocstack 30h
.endprolog
mov dword ptr
; more code
__CxxFrameHandler3 endp
6
задан Mehrdad 3 February 2012 в 05:01
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