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