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How Check if the address is Correct ?

 
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Twistedfate
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Joined: 11 Mar 2016
Posts: 212

PostPosted: Thu Dec 21, 2017 12:02 am    Post subject: How Check if the address is Correct ? Reply with quote

I know
cmp eax,0 <-----------------eax is always 0 even when the address is clearly invalid: "?? ?? ?? ??"

but how could I check if the address it self is wrong
look at the picture .
if the game go to this address will break

mov edi,[edi+00000138]
because edi value is 1 and cannot be used as correct address

so how to check the edi if contain the correct address or not .


2nd Question can I use:
pushfd
pushad
pushf
or pushfd is enough rather than pushf



Code:
mov [atk],1
pushfd
pushad

push 4  //size in bytes of pointer
lea eax,[atk]
//i try also lea eax,[atk+00000138] same crash ..
push eax
call isbadreadptr
cmp eax,0
jne invalidmemory2

popad
popfd



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ParkourPenguin
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Joined: 06 Jul 2014
Posts: 1960
Location: Arcadian Suburbia

PostPosted: Thu Dec 21, 2017 9:52 am    Post subject: Reply with quote

Twistedfate wrote:
but how could I check if the address it self is wrong

Read this topic. For a 64-bit example, see this topic.
Twistedfate wrote:
2nd Question can I use:
pushfd
pushad
pushf
or pushfd is enough rather than pushf

pushad pushes all general purpose registers on the stack (probably unnecessary to do all of them), and pushf / pushfd pushes the flags/eflags register on the stack (probably unnecessary unless the game checks it right after the code injection).

Always use pushfd (pushfq for 64-bit) unless you know you have a good reason to use pushf.

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