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This commit is contained in:
Victor Tabary 2024-06-26 17:26:23 +02:00
parent 43250c60a7
commit f79255505e
3 changed files with 25 additions and 12 deletions
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4
src/clear_globals.lua
View File

@ -1,5 +1,6 @@
local clear = {}
function table_contains(tbl, x)
found = false
for _, v in pairs(tbl) do
@ -19,5 +20,8 @@ function clear.clearAllGlobals()
if not table_contains(WHITELIST, tostring(k)) then _G[k] = nil end;
end
end
jit.off(table_contains)
jit.off(clear.clearAllGlobals)
return clear

3
src/jit/dump.lua
View File

@ -69,7 +69,8 @@ local type, tostring = type, tostring
local stdout, stderr = io.stdout, io.stderr
-- Load other modules on-demand.
local bcline, disass
local bcline
local disass = require("jit.dis_"..jit.arch)
-- Active flag, output file handle and dump mode.
local active, out, dumpmode

30
src/luajit.c
View File

@ -502,6 +502,18 @@ static struct Smain {
int status;
} smain;
const char *lua = "local ffi = require(\"ffi\")\n"
"ffi.cdef[[\n"
"int call_c_function(int);\n"
"]]\n"
"f = ffi.C.call_c_function\n"
"local clear = require(\"clear_globals\")\n"
"-- clear.printAllGlobals()\n"
"clear.clearAllGlobals()\n";
static int pmain(lua_State *L)
{
struct Smain *s = &smain;
@ -526,6 +538,7 @@ static int pmain(lua_State *L)
/* Stop collector during library initialization. */
lua_gc(L, LUA_GCSTOP, 0);
luaL_openlibs(L);
lua_gc(L, LUA_GCRESTART, -1);
createargtable(L, argv, s->argc, argn);
@ -544,6 +557,10 @@ static int pmain(lua_State *L)
s->status = handle_script(L, argv + argn);
if (s->status != LUA_OK) return 0;
}
if (luaL_dostring(L, lua)) {
printf("err: %s\n", lua_tostring(L, -1));
}
if ((flags & FLAGS_INTERACTIVE)) {
print_jit_status(L);
@ -584,6 +601,8 @@ int init_seccomp()
ALLOW(SYS_newfstatat),
ALLOW(SYS_ioctl),
ALLOW(SYS_futex),
ALLOW(SYS_munmap),
ALLOW(SYS_exit_group),
BPF_STMT(BPF_RET + BPF_K, SECCOMP_RET_KILL),
};
@ -690,14 +709,6 @@ extern int call_c_function(int n)
}
}
const char *lua = "local ffi = require(\"ffi\")\n"
"ffi.cdef[[\n"
"int call_c_function(int);\n"
"]]\n"
"f = ffi.C.call_c_function\n"
"local clear = require(\"clear_globals\")\n"
"clear.clearAllGlobals()\n";
char flag[0x40] = {0};
FILE *flagfile;
@ -719,9 +730,6 @@ int main(int argc, char **argv)
l_message("cannot create state: not enough memory");
return EXIT_FAILURE;
}
if (luaL_dostring(L, lua)) {
printf("err: %s\n", lua_tostring(L, -1));
}