Closed Bug 656331 Opened 9 years ago Closed 9 years ago
XPCOM binary component registration ignores Module::k
At APN, we compiled a binary component for FF4, using an old XULRunner SDK. Module::kVersion was 1, and with the FF5 Aurora code changing that to 2, we expected we needed to recompile for FF5. However, in smoke-testing, I discovered that XPCOM code is not checking the Module::kVersion field of the component it is registering. This means that a binary component compiled for one version of XPCOM (including an invalid version like 220) would be enabled across all versions of XPCOM from Gecko 2.0+. I recognize that Module::kVersion was changed for a reason, to force binary components to update. Allowing mismatched kVersion fields means an incompatible DLL could register - or worse, supersede a properly compiled DLL for that version of Firefox (see bug 616056 for details).
Assignee: nobody → benjamin
Status: NEW → ASSIGNED
Attachment #531663 - Flags: review?(bzbarsky)
Comment on attachment 531663 [details] [diff] [review] Actually do the version compare, rev. 1 r=me
Attachment #531663 - Flags: review?(bzbarsky) → review+
Status: ASSIGNED → RESOLVED
Closed: 9 years ago
Resolution: --- → FIXED
Attachment #531663 - Flags: approval-mozilla-aurora?
Discussed in triage today - we'd like to approve this, but given that we've missed it before, it needs a test.
Affects Fx4 but extremely unlikely we'll ship an extra release for this. Fx5 is coming soon.
If no one beats me to it, I can work on the testcase tonight, using Mozilla-only code.
Comment on attachment 531837 [details] [diff] [review] testcase as patch brilliantly simple
Attachment #531837 - Flags: review?(benjamin) → review+
Totally nitpicky, but our modern Makefile style is two-space indent after line continuations, like: EXTRA_DSO_LDOPTS = \ $(NSPR_LIBS) \ ... $(NULL)
Check-in needed for trunk. Per comment 4, this is a prerequisite for FF5 Aurora.
Flags: in-testsuite? → in-testsuite+
Comment on attachment 531663 [details] [diff] [review] Actually do the version compare, rev. 1 a=me on this patch and the accompanying test once it runs clean on central. Thanks for the quick turnaround!
Attachment #531663 - Flags: approval-mozilla-aurora? → approval-mozilla-aurora+
Please land for Aurora by Monday May 16 or the approval will potentially be lost. Please mark as status-firefox5 fixed when you do.
There is a bug in /xpcom/components/nsNativeComponentLoader.cpp! >> if (mozilla::Module::kVersion == data.module->mVersion && ... I think there should be "<=" instead of "==", cause: * in Firefox7a - kVersion=7 * in Firefox6a - kVersion=6 * in Firefox5b - kVersion=2 For example XPCOM component built with old SDK supports Firefox7a with kVersion=7. If this component will be running under Firefox5b with the fix I wrote above - all will be fine: mozilla::Module::kVersion = 2; data.module->mVersion = 7; 2 <= 7 == OK
No, this is intentionally ==. Binary components must be recompiled for each release per our new policy.
So you think that I should have for example 3 XPI files with different XPCOM files for 3 different versions of Firefox??? Or should I include 3 different XPCOM files (with similar source code, but different kVersion value in Module unit) in one XPI file? What's a reason for this? I think Firefox must have backwards compatibility with older versions.
I understand all that you wrote. But for example my XPCOM dll has only 1 class which doesn't use any other FF interfaces. It just allows to connect from JS-code (through the methods of my own interface/class) with my stanalone EXE application to obtain some info & vice versa - my EXE can connect to JS-code. P.S. If someone will delete any service from FF7 for example - I think you'll got the NULL as a result when you query that service. Am I right?
It sounds like you'd be better served using js-ctypes then, which will let you call your C++ code from JS without any XPCOM in between, and without a need to recompile for each Firefox release: https://developer.mozilla.org/en/js-ctypes/Using_js-ctypes
"js-ctypes" is not usable for me, cause 1st of all from my JS-code I need to know where the DLL is located. 2nd - it's too difficult to use js-ctypes functions, in XPCOM I have scriptable interface which allows to use "in" & "out" params in a simplest way.
These are both solvable problems, but this discussion should move to a newsgroup, not a bug: http://www.mozilla.org/about/forums/#dev-platform or http://www.mozilla.org/about/forums/#dev-extensions In any event, you are welcome to continue using binary XPCOM components, you will just have to recompile them for every version. That's the trade-off, sorry.
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:6.0) Gecko/20100101 Firefox/6.0 I was trying to see if this is fixed for Fx6 since the flag "status-firefox6" is set on "fixed", but I couldn't. Is there a test case or any steps / guidelines for this bug that can be used to verify the fix? Thanks
Find a binary component compiled against an earlier version and try to register it in Firefox 6? I doubt this needs additional verification, though, since there has been plenty of discussion about it in the groups.
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