The Tor Browser: js/xpconnect/loader/mozJSLoaderUtils.cpp@97036ab72558

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

     2 /* vim: set ts=8 sts=4 et sw=4 tw=99: */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 #include "nsAutoPtr.h"

     9 #include "jsapi.h"

    10 #include "js/OldDebugAPI.h"

    12 #include "nsJSPrincipals.h"

    14 #include "mozilla/scache/StartupCache.h"

    16 using namespace JS;

    17 using namespace mozilla::scache;

    19 // We only serialize scripts with system principals. So we don't serialize the

    20 // principals when writing a script. Instead, when reading it back, we set the

    21 // principals to the system principals.

    22 nsresult

    23 ReadCachedScript(StartupCache* cache, nsACString &uri, JSContext *cx,

    24                  nsIPrincipal *systemPrincipal, MutableHandleScript scriptp)

    25 {

    26     nsAutoArrayPtr<char> buf;

    27     uint32_t len;

    28     nsresult rv = cache->GetBuffer(PromiseFlatCString(uri).get(),

    29                                    getter_Transfers(buf), &len);

    30     if (NS_FAILED(rv))

    31         return rv; // don't warn since NOT_AVAILABLE is an ok error

    33     scriptp.set(JS_DecodeScript(cx, buf, len, nullptr));

    34     if (!scriptp)

    35         return NS_ERROR_OUT_OF_MEMORY;

    36     return NS_OK;

    37 }

    39 nsresult

    40 ReadCachedFunction(StartupCache* cache, nsACString &uri, JSContext *cx,

    41                    nsIPrincipal *systemPrincipal, JSFunction **functionp)

    42 {

    43     return NS_ERROR_FAILURE;

    44 /*  This doesn't actually work ...

    45     nsAutoArrayPtr<char> buf;

    46     uint32_t len;

    47     nsresult rv = cache->GetBuffer(PromiseFlatCString(uri).get(),

    48                                    getter_Transfers(buf), &len);

    49     if (NS_FAILED(rv))

    50         return rv; // don't warn since NOT_AVAILABLE is an ok error

    52     JSObject *obj = JS_DecodeInterpretedFunction(cx, buf, len, nsJSPrincipals::get(systemPrincipal), nullptr);

    53     if (!obj)

    54         return NS_ERROR_OUT_OF_MEMORY;

    55     JSFunction* function = JS_ValueToFunction(cx, OBJECT_TO_JSVAL(obj));

    56     *functionp = function;

    57     return NS_OK;*/

    58 }

    60 nsresult

    61 WriteCachedScript(StartupCache* cache, nsACString &uri, JSContext *cx,

    62                   nsIPrincipal *systemPrincipal, HandleScript script)

    63 {

    64     MOZ_ASSERT(JS_GetScriptPrincipals(script) == nsJSPrincipals::get(systemPrincipal));

    65     MOZ_ASSERT(JS_GetScriptOriginPrincipals(script) == nsJSPrincipals::get(systemPrincipal));

    67     uint32_t size;

    68     void *data = JS_EncodeScript(cx, script, &size);

    69     if (!data)

    70         return NS_ERROR_OUT_OF_MEMORY;

    72     MOZ_ASSERT(size);

    73     nsresult rv = cache->PutBuffer(PromiseFlatCString(uri).get(), static_cast<char *>(data), size);

    74     js_free(data);

    75     return rv;

    76 }

    78 nsresult

    79 WriteCachedFunction(StartupCache* cache, nsACString &uri, JSContext *cx,

    80                     nsIPrincipal *systemPrincipal, JSFunction *function)

    81 {

    82     return NS_ERROR_FAILURE;

    83 /* This doesn't actually work ...

    84     uint32_t size;

    85     void *data =

    86       JS_EncodeInterpretedFunction(cx, JS_GetFunctionObject(function), &size);

    87     if (!data)

    88         return NS_ERROR_OUT_OF_MEMORY;

    90     MOZ_ASSERT(size);

    91     nsresult rv = cache->PutBuffer(PromiseFlatCString(uri).get(), static_cast<char *>(data), size);

    92     js_free(data);

    93     return rv;*/

    94 }

The Tor Browser / file revision

js/xpconnect/loader/mozJSLoaderUtils.cpp@97036ab72558

js/xpconnect/loader/mozJSLoaderUtils.cpp