pico8-musl/pico8-fill-in.c

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2021-12-27 07:02:10 +00:00
// pico8-fill-in.c // 16.11.2020 04:02
#include <stddef.h>
#include <stdio.h>
#include <setjmp.h>
#include <string.h>
#include <stdarg.h>
// https://refspecs.linuxbase.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/libc---strcpy-chk-1.html
// TODO: actually check for overflows
char * __strcpy_chk(char * dest, const char * src, size_t destlen) {
char *d = dest;
//printf("FUCK STRCPY %s :::: %s\n", src, dest);
while (*src != '\0') {
*d++ = *src++;
}
*d++ = *src++;
//printf("STRCPY FINAL %s\n", dest);
return dest;
}
// https://refspecs.linuxbase.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/libc---stpcpy-chk-1.html
char * __stpcpy_chk(char * dest, const char * src, size_t destlen) {
printf("FUCK STPCPY %s :::: %s\n", src, dest);
return stpcpy(dest, src);
}
// https://refspecs.linuxbase.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/libc---strncpy-chk-1.html
char * __strncpy_chk(char * dest, const char * src, size_t n, size_t dest_1len) {
printf("FUCK STRNCPY %s :::: %s\n", src, dest);
return strncpy(dest, src, n);
}
// https://refspecs.linuxbase.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/libc---strcat-chk-1.html
// TODO: There's some good info being dumped here
char * __strcat_chk(char * dest, const char * src, size_t destlen) {
//printf("!!! strcat %s :::: %s\n", src, dest);
char *res = strncat(dest, src, destlen);
return res;
}
// https://refspecs.linuxbase.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/libc---memcpy-chk-1.html
void * __memcpy_chk(void * dest, const void * src, size_t len, size_t destlen) {
//puts("FUCK MEMCPY \n");
return memcpy(dest, src, len);
}
// https://refspecs.linuxbase.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/libc---memset-chk-1.html
void * __memset_chk(void * dest, int c, size_t len, size_t destlen) {
puts("FUCK MEMSET\n");
return memset(dest, c, len);
}
// https://refspecs.linuxbase.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/libc---printf-chk-1.html
int __printf_chk(int flag, const char * format, ...) {
va_list args;
//printf("\nPRINTF\n");
va_start(args, format);
int ret = vprintf(format, args);
va_end(args);
return ret;
}
// https://refspecs.linuxbase.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/libc---fprintf-chk-1.htm
int __fprintf_chk(FILE * stream, int flag, const char * format, ...) {
va_list args;
//printf("\nFPRINTF\n");
va_start(args, format);
int ret = vfprintf(stream, format, args);
va_end(args);
return ret;
}
// https://refspecs.linuxbase.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/libc---sprintf-chk-1.html
// TODO: some intresting info
int __sprintf_chk(char * str, int flag, size_t strlen, const char * format, ...) {
va_list args;
//printf("!!!ORIGINAL %s\n", str);
va_start(args, format);
// int ret = vsnprintf(str, strlen, format, args);
// TOOD: Look more into the nature of this function getting passed a -1
// strlen and how else it might be mitigated ?
int ret = vsprintf(str, format, args);
va_end(args);
//printf("!!! sprintf !!!ADR:%p !!!STRLEN:%i !!!RET::%i !!!FORMAT::%s\n!!!OUTPUT::%s\n", str, strlen, ret, format, str);
return ret;
}
void __longjmp_chk () {
// puts("FUCK LONG JMP\n");
asm("pop %rbp");
goto *(&longjmp);
}
void __fread_chk () {
// asm ("pop %rbp");
puts("FUCK FREAD\n");
// stub
}