Is there any way I could pass arguments to shellcode. My goal is to store a program in a image file, and have another program read and run the code with arguments in memory.
Currently I can store a program in a image file, then read it back to the hard-drive run it normally then delete it when it's done running, but I'm worried someone could undelete the program.
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Tried the following code, the shellcode prints a string in argc < 2 or prints argv[1] if there is an argument. Code bellow.
when compiled it gets an warning,
and segfaults when resulting program is run.
shellcode is genorated with shellforge using code bellow.
Is there any way I could pass arguments to shellcode.
Well, what is it?
Quote:
My goal is to store a program in a image file, and have another program read and run the code with arguments in memory.
Why are you doing this?
Quote:
Currently I can store a program in a image file, then read it back to the hard-drive run it normally then delete it when it's done running, but I'm worried someone could undelete the program.
Ah, so it's an entire executable file? An executable file is not a function. That won't work. Why are you concerned about people undeleting the executables you're hiding in an image file, and not about them undeleting the image file?
Quote:
Tried the following code, the shellcode prints a string in argc < 2 or prints argv[1] if there is an argument. Code bellow.
How did you write this? I have no idea if you should expect this to work or not even if the segment the data in was executable. You need to create an executable segment with mmap(), copy the data in, and run it from there, but beyond that I can't help you.
Reading about mmap now.
As for why I'm doing it, sort of a hobbie, write lots of ciphers and file hiding programs, thought I'd write one that can hide the resulting programs. Create a big maze of ciphered and hidden files and get my friends to try and find and decode them.
This doesn't use shellforge at all. It write()'s the raw strings from argv to standard output. That's what had me so puzzled: There's some very important steps missing between this and even the nonfunctional example you posted.
sizeof() doesn't work on strings either since sizeof() is fixed at compile-time while strings can vary at runtime. It only gives you the size of the pointer pointing to the string. strlen() would be what you want.
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if
then
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fi
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$argv
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