is there a better way?

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asmrox

Joined: 19 Jan 2008
Posts: 160

asmrox 09 May 2008, 15:08

sub esp,32
mov ebp,esp
mov dword [ebp],5
lea ecx,[ebp+4]
push 1
push 123
push ecx
call [something]
...

is there a better way to push address of buffer?[/b]

09 May 2008, 15:08

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20666
Location: In your JS exploiting you and your system

revolution 09 May 2008, 15:17

asmrox wrote:

is there a better way to push address of buffer?

No, but it would look nicer (for you the programmer) if you used symbolic labels/symbols to show what all those fixed constants are meant to be.

Don't forget those [code] tags.

09 May 2008, 15:17

Frank

Joined: 17 Jun 2003
Posts: 100

Frank 09 May 2008, 19:27

Isn't that unnecessarily complicated? The following should do the same:

Code:

sub  esp, 28
mov  ecx, esp
push 5
push 1
push 123
push ecx
call [something]
...

09 May 2008, 19:27

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20666
Location: In your JS exploiting you and your system

revolution 10 May 2008, 03:00

Frank wrote:

Isn't that unnecessarily complicated? The following should do the same:
Code:
sub  esp, 28
mov  ecx, esp
push 5
push 1
push 123
push ecx
call [something]
...    

But we don't know what follows this code, we can't assume that setting ebp is not needed. You are using fixed constants also and assuming the original offset of +4 won't change.

10 May 2008, 03:00

bitRAKE

Joined: 21 Jul 2003
Posts: 4249
Location: vpcmpistri

bitRAKE 10 May 2008, 05:49

Just for fun:

Code:

pushad
mov ebp,esp
pop ecx
mov ecx,esp
push 5
push 1
push 123
push ecx
call [something]

...assuming buffer contents ignored/overwritten.

(this is post 666 for me, btw ) Laughing

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10 May 2008, 05:49

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