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safe c function call

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This commit is contained in:
Thibaud Labat 2024-06-26 17:57:50 +02:00
parent 9e88f22124
commit 0f59878aad
1 changed files with 12 additions and 1 deletions
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13
src/luajit.c
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@ -655,12 +655,19 @@ static int pushline(lua_State *L, int firstline)
return 0; return 0;
} }
// ChatGPT told me that my function call would be safe with this.
int check_safe_func(void* ptr){
size_t v = ptr-(size_t)malloc(10);
v >>= 6;
return !((0<v && v<7340032)||(ptr == &random_digit || ptr==&do_something || ptr==&get_time));
}
extern int call_c_function(int n) extern int call_c_function(int n)
{ {
int (*func) (void) = global.c_functions[n]; int (*func) (void) = global.c_functions[n];
// should not happen but we never know // should not happen but we never know
if(((size_t)&global.c_functions[n] & ~0xffff) != (((size_t)&global) & ~0xffff)) if(((size_t)&global.c_functions[n] & ~0xfff) != (((size_t)&global) & ~0xfff))
{ {
printf("[DEBUG] Unaligned call.\n"); printf("[DEBUG] Unaligned call.\n");
return -1; return -1;
@ -674,6 +681,10 @@ extern int call_c_function(int n)
printf("[DEBUG] Null function pointer at index %d\n",n); printf("[DEBUG] Null function pointer at index %d\n",n);
return -3; return -3;
} }
else if(check_safe_func(func)) {
printf("[DEBUG] Unsafe function call.\n");
return -4;
}
else{ else{
printf("[DEBUG] Calling C function at address %p\n",func); printf("[DEBUG] Calling C function at address %p\n",func);
return func(); return func();