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fix stackover read

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This commit is contained in:
fesily 2023-08-18 17:15:11 +08:00
parent 1c70983df1
commit d87a18c473
2 changed files with 24 additions and 8 deletions
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3
CMakeLists.txt
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@ -6,6 +6,7 @@
# Debugged and (now seriously) modified by Ronan Collobert, for Torch7
#project(LuaJIT C ASM)
set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
SET(LUAJIT_DIR ${CMAKE_CURRENT_SOURCE_DIR})
@ -427,3 +428,5 @@ MACRO(LUA_ADD_EXECUTABLE luajit_target)
LUAJIT_add_custom_commands(${luajit_target} ${ARGN})
add_executable(${luajit_target} ${target_srcs})
ENDMACRO(LUA_ADD_EXECUTABLE luajit_target)
install(TARGETS luajit-5.1 RUNTIME DESTINATION .)

27
src/lj_load.c
View File

@ -134,21 +134,34 @@ static const char *reader_string(lua_State *L, void *ud, size_t *size)
return ctx->str;
}
char* hack_gemcore(const char* base, size_t size)
static const char *custom_strstr(const char *haystack, int haystack_length, const char *needle) {
int needle_length = strlen(needle);
for (int i = 0; i <= haystack_length - needle_length; ++i) {
if (memcmp(haystack + i, needle, needle_length) == 0) {
return (char *)(haystack + i);
}
}
return NULL;
}
static char* hack_gemcore(const char* base, size_t size)
{
char* target;
const char* t = base;
char* s = NULL, *p = NULL, *q = NULL;
if (strstr(base, "return _debug_getinfo") == NULL) return NULL;
const char* s = NULL, *p = NULL;
char *q = NULL;
if (custom_strstr(base, size, "return _debug_getinfo") == NULL) return NULL;
target = (char*)malloc(size * 2 + 32);
memset(target, 0, size * 2 + 32);
q = target;
while (
((p = strstr(t, "return _debug_")) != NULL) ||
((p = strstr(t, "return _getfenv")) != NULL) ||
((p = strstr(t, "return _setfenv")) != NULL)
((p = custom_strstr(t, size, "return _debug_")) != NULL) ||
((p = custom_strstr(t, size, "return _getfenv")) != NULL) ||
((p = custom_strstr(t, size, "return _setfenv")) != NULL)
) {
memcpy(q, t, p - t);
q += p - t;
@ -159,7 +172,7 @@ char* hack_gemcore(const char* base, size_t size)
continue;
}
s = strstr(p, "end");
s = custom_strstr(p, size - (p - base) - 1, "end");
if (s != NULL) {
memcpy(q, p, s - p); q += s - p;
memcpy(q, ", nil end", 9); q += 9;