path: root/texlive-core-2021-CVE-2023-32700.patch

https://bugs.gentoo.org/906712
--- a/texk/web2c/luatexdir/lua/loslibext.c
+++ b/texk/web2c/luatexdir/lua/loslibext.c
@@ -1035,6 +1035,111 @@ static int os_execute(lua_State * L)
 }
 
 
+/*
+** ======================================================
+** l_kpse_popen spawns a new process connected to the current
+** one through the file streams with some checks by kpse.
+** Almost verbatim from Lua liolib.c .
+** =======================================================
+*/
+#if !defined(l_kpse_popen)           /* { */
+
+#if defined(LUA_USE_POSIX)      /* { */
+
+#define l_kpse_popen(L,c,m)          (fflush(NULL), popen(c,m))
+#define l_kpse_pclose(L,file)        (pclose(file))
+
+#elif defined(LUA_USE_WINDOWS)  /* }{ */
+
+#define l_kpse_popen(L,c,m)          (_popen(c,m))
+#define l_kpse_pclose(L,file)        (_pclose(file))
+
+#else                           /* }{ */
+
+/* ISO C definitions */
+#define l_kpse_popen(L,c,m)  \
+          ((void)((void)c, m), \
+          luaL_error(L, "'popen' not supported"), \
+          (FILE*)0)
+#define l_kpse_pclose(L,file)                ((void)L, (void)file, -1)
+
+#endif                          /* } */
+
+#endif                          /* } */
+typedef luaL_Stream LStream;
+#define tolstream(L)    ((LStream *)luaL_checkudata(L, 1, LUA_FILEHANDLE))
+static LStream *newprefile (lua_State *L) {
+  LStream *p = (LStream *)lua_newuserdata(L, sizeof(LStream));
+  p->closef = NULL;  /* mark file handle as 'closed' */
+  luaL_setmetatable(L, LUA_FILEHANDLE);
+  return p;
+}
+static int io_kpse_pclose (lua_State *L) {
+  LStream *p = tolstream(L);
+  return luaL_execresult(L, l_kpse_pclose(L, p->f));
+}
+static int io_kpse_check_permissions(lua_State *L) {
+    const char *filename = luaL_checkstring(L, 1);
+    if (filename == NULL) {
+        lua_pushboolean(L,0);
+        lua_pushliteral(L,"no command name given");
+    } else if (shellenabledp <= 0) {
+        lua_pushboolean(L,0);
+        lua_pushliteral(L,"all command execution is disabled");
+    } else if (restrictedshell == 0) {
+        lua_pushboolean(L,1);
+        lua_pushstring(L,filename);
+    } else {
+        char *safecmd = NULL;
+        char *cmdname = NULL;
+        switch (shell_cmd_is_allowed(filename, &safecmd, &cmdname)) {
+            case 0:
+                lua_pushboolean(L,0);
+                lua_pushliteral(L, "specific command execution disabled");
+                break;
+            case 1:
+                /* doesn't happen */
+                lua_pushboolean(L,1);
+                lua_pushstring(L,filename);
+                break;
+            case 2:
+                lua_pushboolean(L,1);
+                lua_pushstring(L,safecmd);
+                break;
+            default:
+                /* -1 */
+                lua_pushboolean(L,0);
+                lua_pushliteral(L, "bad command line quoting");
+                break;
+        }
+    }
+    return 2;
+}
+static int io_kpse_popen (lua_State *L) {
+  const char *filename = NULL;
+  const char *mode = NULL;
+  LStream *p = NULL;
+  int okay;
+  filename = luaL_checkstring(L, 1);
+  mode = luaL_optstring(L, 2, "r");
+  lua_pushstring(L,filename);
+  io_kpse_check_permissions(L);
+  filename = luaL_checkstring(L, -1);
+  okay = lua_toboolean(L,-2);
+  if (okay && filename) {
+    p = newprefile(L);
+    luaL_argcheck(L, ((mode[0] == 'r' || mode[0] == 'w') && mode[1] == '\0'),
+		  2, "invalid mode");
+    p->f = l_kpse_popen(L, filename, mode);
+    p->closef = &io_kpse_pclose;
+    return (p->f == NULL) ? luaL_fileresult(L, 0, filename) : 1;
+  } else {
+    lua_pushnil(L);
+    lua_pushvalue(L,-2);
+    return 2;
+  }
+}
+
 void open_oslibext(lua_State * L)
 {
 
@@ -1068,6 +1173,8 @@ void open_oslibext(lua_State * L)
     lua_setfield(L, -2, "execute");
     lua_pushcfunction(L, os_tmpdir);
     lua_setfield(L, -2, "tmpdir");
+    lua_pushcfunction(L, io_kpse_popen);
+    lua_setfield(L, -2, "kpsepopen");
 
     lua_pop(L, 1);              /* pop the table */
 }
--- a/texk/web2c/luatexdir/lua/luatex-core.c
+++ b/texk/web2c/luatexdir/lua/luatex-core.c
@@ -91,590 +91,579 @@ int load_luatex_core_lua (lua_State * L)
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+    0x0a, 0x00
   };
   return luaL_dostring(L, (const char*) luatex_core_lua);
 }
\ No newline at end of file
--- a/texk/web2c/luatexdir/lua/luatex-core.lua
+++ b/texk/web2c/luatexdir/lua/luatex-core.lua
@@ -34,7 +34,6 @@ if kpseused == 1 then
     local kpse_recordoutputfile = kpse.record_output_file
 
     local io_open               = io.open
-    local io_popen              = io.popen
     local io_lines              = io.lines
 
     local fio_readline          = fio.readline
@@ -75,12 +74,6 @@ if kpseused == 1 then
         return f
     end
 
-    local function luatex_io_popen(name,...)
-        local okay, found = kpse_checkpermission(name)
-        if okay and found then
-            return io_popen(found,...)
-        end
-    end
 
     -- local function luatex_io_lines(name,how)
     --     if name then
@@ -130,7 +123,7 @@ if kpseused == 1 then
     mt.lines = luatex_io_readline
 
     io.open  = luatex_io_open
-    io.popen = luatex_io_popen
+    io.popen = os.kpsepopen
 
 else
 
@@ -169,6 +162,8 @@ if saferoption == 1 then
     os.setenv  = installdummy("os.setenv")
     os.tempdir = installdummy("os.tempdir")
 
+    os.kpsepopen = installdummy("os.kpsepopen")
+
     io.popen   = installdummy("io.popen")
     io.open    = installdummy("io.open",luatex_io_open_readonly)