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Problem using Call/ret operators

 
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Xblade Of Heaven
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PostPosted: Fri Nov 20, 2015 8:06 pm    Post subject: Problem using Call/ret operators Reply with quote
Hi all, i leave my problem explained in an image



how can fix the ret return to returnhere address 0AE1D59F no in 0AE1D59E

me understand ret rerutn to next call address, ok, somebody can help me for return to correct adress?

regards
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Zanzer
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PostPosted: Fri Nov 20, 2015 9:05 pm    Post subject: Reply with quote
That is how CALL and RET work.
Sounds like you want to use this instead.
Code:
jmp MyCode
jmp returnhere
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Xblade Of Heaven
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PostPosted: Fri Nov 20, 2015 9:24 pm    Post subject: Reply with quote
Zanzer wrote:
That is how CALL and RET work.
Sounds like you want to use this instead.
Code:
jmp MyCode
jmp returnhere


yes but i try use call and ret no jmp instruction.

regards
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ParkourPenguin
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PostPosted: Fri Nov 20, 2015 9:37 pm    Post subject: Reply with quote
Considering you replaced the byte at 0AE1D59E with NOP, it should work anyways.

But if you absolutely must change the return address, then just modify the address on the top of the stack. From an x86 reference:
Quote:
RET: Transfers program control to a return address located on the top of the stack.

So just add however many bytes you want to [esp] right before you execute ret.
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Dark Byte
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PostPosted: Sat Nov 21, 2015 2:33 am    Post subject: Reply with quote
also a heads up just in case you get other errors, you're comparing [esp+58] with a value.
the call, pushfd and pushad will change esp
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