Seeking more detail and PoC from ZDI. E.g. what does the hs() function do? Seems like it might be an important part of this.
Also is this a XUL document or an HTML document?
Testcase crashes on Mac 220.127.116.11pre during GC. 0 libxpconnect.dylib 0x00d28eca XPCJSRuntime::GCCallback(JSContext*, JSGCStatus) + 1716 (xpcjsruntime.cpp:818) 1 libgklayout.dylib 0x131dda74 DOMGCCallback(JSContext*, JSGCStatus) + 48 (nsJSEnvironment.cpp:3517) 2 libmozjs.dylib 0x00232899 js_GC + 4378 (jsgc.c:3536) 3 libmozjs.dylib 0x0022e1ff js_NewGCThing + 673 (jsgc.c:1765) 4 libmozjs.dylib 0x002af224 js_NewString + 72 (jsstr.c:2467) 5 libmozjs.dylib 0x002a76ec js_ConcatStrings + 986 (jsstr.c:167) 6 libmozjs.dylib 0x00239fb5 js_Interpret + 27544 (jsinterp.c:3684) 7 libmozjs.dylib 0x0024fde3 js_Execute + 865 (jsinterp.c:1544) 8 libmozjs.dylib 0x001ef8b0 JS_EvaluateUCScriptForPrincipals + 221 (jsapi.c:4999) 9 libgklayout.dylib 0x131e11d2 nsJSContext::EvaluateString(nsAString_internal const&, void*, nsIPrincipal*, char const*, unsigned int, unsigned int, nsAString_internal*, int*) + 916 (nsJSEnvironment.cpp:1530) 10 libgklayout.dylib 0x13210f1f nsGlobalWindow::RunTimeout(nsTimeout*) + 1423 (nsGlobalWindow.cpp:7875) 11 libgklayout.dylib 0x132115d8 nsGlobalWindow::TimerCallback(nsITimer*, void*) + 54 (nsGlobalWindow.cpp:8228) 12 libxpcom_core.dylib 0x003b1d60 nsTimerImpl::Fire() + 868 (nsTimerImpl.cpp:401) 13 libxpcom_core.dylib 0x003b1f8e nsTimerEvent::Run() + 192 (nsTimerImpl.cpp:492) 14 libxpcom_core.dylib 0x003ab77a nsThread::ProcessNextEvent(int, int*) + 676 (nsThread.cpp:511) 15 libxpcom_core.dylib 0x003365d4 NS_ProcessPendingEvents_P(nsIThread*, unsigned int) + 146 (nsThreadUtils.cpp:180) 16 libwidget_mac.dylib 0x11b44d0b nsBaseAppShell::NativeEventCallback() + 181 (nsBaseAppShell.cpp:122) 17 libwidget_mac.dylib 0x11b003d6 nsAppShell::ProcessGeckoEvents(void*) + 518 (nsAppShell.mm:303) 18 com.apple.CoreFoundation 0x945e063f CFRunLoopRunSpecific + 3215 19 com.apple.CoreFoundation 0x945e0cd8 CFRunLoopRunInMode + 88 20 com.apple.HIToolbox 0x948382c0 RunCurrentEventLoopInMode + 283 21 com.apple.HIToolbox 0x948380d9 ReceiveNextEventCommon + 374 22 com.apple.HIToolbox 0x94837f4d BlockUntilNextEventMatchingListInMode + 106 23 com.apple.AppKit 0x94e7cd7d _DPSNextEvent + 657 24 com.apple.AppKit 0x94e7c630 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 128 25 com.apple.AppKit 0x94e7566b -[NSApplication run] + 795 26 libwidget_mac.dylib 0x11afed8c nsAppShell::Run() + 288 (nsAppShell.mm:591) 27 libtoolkitcomps.dylib 0x127566cc nsAppStartup::Run() + 148 (nsAppStartup.cpp:181) 28 XUL 0x000f7a11 XRE_main + 13853 (nsAppRunner.cpp:3193) 29 org.mozilla.firefox 0x000026d3 main + 709 (nsBrowserApp.cpp:158) 30 org.mozilla.firefox 0x00001d00 _start + 210 31 org.mozilla.firefox 0x00001c2d start + 41
This may be fixed in 1.9.1, my Mac hasn't crashed. I'll try the testcase in a windows VM next but it may have been fixed by one of the JS bugs Jesse already smoked out.
This seems to have been fixed between 2008-11-13 and 2008-11-14: http://hg.mozilla.org/mozilla-central/pushloghtml?startdate=2008-11-13+05%3A00%3A00&enddate=2008-11-14+06%3A00%3A00 Fixed somehow by bug 425153?
That doesn't seem very likely.... Bug 457022 is in the range too, but also doesn't seem that likely. Is someone willing to try bisecting?
This is surely JS, XPConnect or content. Moving to XPConnect.
Sounds like this is not an issue in 1.9.1, so not blocking.
peterv: looking at that fix range you're the most likely fixer, could you investigate whether your checkins fixed this 1.9.0-blocking externally-reported security bug? Thanks!
Peterv: Any luck on this?
I bisected and this is definitely fixed by 457022, but we can't take that on branch. Trying to figure out what's going on.
Created attachment 360558 [details] [diff] [review] v1 This was a hard one to debug, but it's a simple problem. An element is destroyed and its destructor calls UnbindFromTree on its children, one of which is a XUL element. UnbindFromTree unhooks any XBL bindings and we end up in nsXBLBinding::ChangeDocument. ChangeDocument tries to wrap the XUL element but for some reason there's no existing wrapper anymore (we probably unlinked the document from cycle collection?) and we create a new wrapper. The PreCreate hook for the XUL element uses the parent node as the parent for the wrapper, the parent node is the element that is being destroyed and so we wrap that dying object. At some point the wrapper tries to access its native object, but it is already dead. The fix is to null out the parent before unhooking XBL bindings. I made nulling the parent the first thing in UnbindFromTree, none of the things we did before it really need the parent. The reason why this is fixed on trunk is probably because we store the wrapper in the element and not in a hash in the ownerDocument, so the wrapper for XBL-bound nodes stays alive even when the ownerDocument is unlinked or dies (and the parent is kept alive too). I think we should still take this fix on trunk too, it looks safer.
Created attachment 360562 [details] [diff] [review] v1 Sorry, wrong patch. We must not unset PARENT_BIT_INDOCUMENT before calling GetCurrentDoc.
Comment on attachment 360562 [details] [diff] [review] v1 Approved for 18.104.22.168, a=dveditz for release-drivers.
Checked in to trunk and 1.9.0.x branch. Haven't checked in the testcase.
Comment on attachment 360562 [details] [diff] [review] v1 This is already in 1.9.1
peterv: Although the fixed code in UnbindFromTree looks similar on the 1.8 branch, this exploit doesn't crash the browser. I'm sure notifications have changed a lot between the two branches. I'm assuming we don't need this fix on the 1.8 branch, but please renominate for blocking1.8.1.next if you think it would be safer if we took it.
Comment on attachment 360562 [details] [diff] [review] v1 This hasn't landed on 1.9.1. Like on trunk the crash is already fixed by bug 457022 but I still think it'd be a good idea to take this patch on branch because it's safer and low-risk.
(In reply to comment #18) > I'm assuming we don't need this fix on > the 1.8 branch, but please renominate for blocking1.8.1.next if you think it > would be safer if we took it. I think we probably don't need it on 1.8.1 because we don't have cycle collection and so the wrappers don't get unlinked.
Verified the crashes using the POC testcase with 22.214.171.124 and the fix in 126.96.36.199 with Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:188.8.131.52pre) Gecko/2009021304 GranParadiso/3.0.7pre. This is fixed now.
Comment on attachment 360562 [details] [diff] [review] v1 I think we should take this on the branch to be consistent with the trunk, even if it's not strictly needed there.
Um, I'm guessing my above comment was either meant for a different bug, or I was really confused when I made the above comment...
peterv, do you know if there's a simple testcase for this bug that can be used as a crashtest?