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diff --git a/md/writeup/linux_shellcode.md b/md/writeup/linux_shellcode.md new file mode 100644 index 0000000..083a817 --- /dev/null +++ b/md/writeup/linux_shellcode.md @@ -0,0 +1,51 @@ +title:Linux ShellCode +keywords:linux,shellcode,c,assembler + +# Linux ShellCode +First shell code written from example. Shell code is very interesting +way how to execute some code.asm source: + +```asm +use32 +xor eax, eax +inc eax +xor ebx, ebx +int 80h +``` + +``` +fasm code.asm code.bin +``` +bin2hex output: + +``` +\x31\xc0\x40\x31\xdb\xcd\x80 +``` + +C source: +```c +#include <stdio.h> +char code[] = "\x31\xc0\x40\x31\xdb\xcd\x80"; +int main() +{ + void (*ret)(); + ret = (void (*)())code; + ret(); + printf("Nope it not working\n"); +} +``` +``` +gcc main.c -o main +``` +run +``` +./main +``` +nothing happens. That exactly that code do exits from programm + + + +## Downloads +linux_shell_code.zip - +4KiB - http://archive.main.lv/files/writeup/linux_shellcode_1/linux_shell_code.zip + |