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‎zero_runtime/function_call.asm

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; MIT License
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;
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; Copyright (c) 2022 m!haly4
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;
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; Permission is hereby granted, free of charge, to any person obtaining a copy
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; of this software and associated documentation files (the "Software"), to deal
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; in the Software without restriction, including without limitation the rights
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; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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; copies of the Software, and to permit persons to whom the Software is
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; furnished to do so, subject to the following conditions:
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;
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; The above copyright notice and this permission notice shall be included in all
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; copies or substantial portions of the Software.
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;
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; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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; SOFTWARE.
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global system_read
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global system_write
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global system_errno
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section .text
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main_system_call:
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push ebp
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mov ebp, esp
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push ebx
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mov ebx, [ebp+8]
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mov ecx, [ebp+12]
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mov edx, [ebp+16]
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int 80h
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mov edx, eax
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and edx, 0fffff000h
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cmp edx, 0fffff000h
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jnz .success
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mov [system_errno], eax
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mov eax, -1
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.success: pop ebx
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mov esp, ebp
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pop ebp
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ret
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system_read: mov eax, 3
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jmp main_system_call
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system_write: mov eax, 4
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jmp main_system_call
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section .bss
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system_errno: resd 1

‎zero_runtime/main.c

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/*
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MIT License
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Copyright (c) 2022 m!haly4
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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/*function declaration*/
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int system_write(int fd, const void *buf, int size);
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/*declaration of few strings*/
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static const char error_message[] = "Invalid input:\nPlease enter the password\n";
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static const char password[] = "Hello";
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static const char data[] = "Success!\nThe secret data: <the data was deleted> :)\n";
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/*function for calculating the length of the string*/
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static int string_length(const char *string)
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{
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int i = 0;
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while (string[i])
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{
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i++;
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}
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return i;
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}
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/*function for comparing two strings*/
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static int string_compare(char *string, const char *bufer)
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{
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int i = 0;
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/*to check that both lines are the same length*/
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if((string_length(bufer)) == (string_length(string)))
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{
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while (string[i])
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{
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if(string[i] == bufer[i])
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{
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++i;
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}
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else
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{
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break;
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}
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}
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}
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else
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{
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return 0;
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}
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return i;
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}
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int main(int argc, char **argv)
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{
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/*check at least 1 argument exist and check the password correctness*/
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if((argc > 1) && (string_compare(argv[1], password) == 5))
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{
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system_write(1, data, sizeof(data)-1);
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/*
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system_write(1, argv[1], string_length(argv[1]));
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system_write(1, "\n", 1);
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*/
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}
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else
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{
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/*error message*/
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system_write(1, error_message, sizeof(error_message)-1);
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return 1;
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}
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return 0;
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}

‎zero_runtime/start.asm

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; MIT License
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;
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; Copyright (c) 2022 m!haly4
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;
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; Permission is hereby granted, free of charge, to any person obtaining a copy
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; of this software and associated documentation files (the "Software"), to deal
7+
; in the Software without restriction, including without limitation the rights
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; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9+
; copies of the Software, and to permit persons to whom the Software is
10+
; furnished to do so, subject to the following conditions:
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;
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; The above copyright notice and this permission notice shall be included in all
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; copies or substantial portions of the Software.
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;
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; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16+
; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17+
; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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; SOFTWARE.
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global _start
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extern main
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section .text
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_start: mov ecx, [esp] ; argc -> ecx
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mov eax, esp
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add eax, 4 ; argv -> eax
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push eax
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push ecx
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call main
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add esp, 8 ; clean the stack
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mov ebx, eax ; call _exit
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mov eax, 1
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int 80h

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