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bug: when manipulating other threads, there is no garanties about

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their stack space
This commit is contained in:
Roberto Ierusalimschy 2015-02-19 15:16:55 -02:00
parent abd8f8433d
commit 5705476065
1 changed files with 11 additions and 1 deletions
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12
ldblib.c
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@ -1,5 +1,5 @@
/*
** $Id: ldblib.c,v 1.132 2012/01/19 20:14:44 roberto Exp $
** $Id: ldblib.c,v 1.132.1.1 2013/04/12 18:48:47 roberto Exp roberto $
** Interface from Lua to its debug API
** See Copyright Notice in lua.h
*/
@ -21,6 +21,11 @@
#define HOOKKEY "_HKEY"
static void checkstack (lua_State *L, lua_State *L1, int n) {
if (L != L1 && !lua_checkstack(L1, n))
luaL_error(L, "stack overflow");
}
static int db_getregistry (lua_State *L) {
lua_pushvalue(L, LUA_REGISTRYINDEX);
@ -114,6 +119,7 @@ static int db_getinfo (lua_State *L) {
int arg;
lua_State *L1 = getthread(L, &arg);
const char *options = luaL_optstring(L, arg+2, "flnStu");
checkstack(L, L1, 3);
if (lua_isnumber(L, arg+1)) {
if (!lua_getstack(L1, (int)lua_tointeger(L, arg+1), &ar)) {
lua_pushnil(L); /* level out of range */
@ -173,6 +179,7 @@ static int db_getlocal (lua_State *L) {
else { /* stack-level argument */
if (!lua_getstack(L1, luaL_checkint(L, arg+1), &ar)) /* out of range? */
return luaL_argerror(L, arg+1, "level out of range");
checkstack(L, L1, 1);
name = lua_getlocal(L1, &ar, nvar);
if (name) {
lua_xmove(L1, L, 1); /* push local value */
@ -196,6 +203,7 @@ static int db_setlocal (lua_State *L) {
return luaL_argerror(L, arg+1, "level out of range");
luaL_checkany(L, arg+3);
lua_settop(L, arg+3);
checkstack(L, L1, 1);
lua_xmove(L, L1, 1);
lua_pushstring(L, lua_setlocal(L1, &ar, luaL_checkint(L, arg+2)));
return 1;
@ -313,6 +321,7 @@ static int db_sethook (lua_State *L) {
lua_pushvalue(L, -1);
lua_setmetatable(L, -2); /* setmetatable(hooktable) = hooktable */
}
checkstack(L, L1, 1);
lua_pushthread(L1); lua_xmove(L1, L, 1);
lua_pushvalue(L, arg+1);
lua_rawset(L, -3); /* set new hook */
@ -331,6 +340,7 @@ static int db_gethook (lua_State *L) {
lua_pushliteral(L, "external hook");
else {
gethooktable(L);
checkstack(L, L1, 1);
lua_pushthread(L1); lua_xmove(L1, L, 1);
lua_rawget(L, -2); /* get hook */
lua_remove(L, -2); /* remove hook table */