194894 2019-02-20 21:11:18 -0800 Discard cached processes when clearing website data store 2019-02-27 10:05:01 -0800 1 1 1 Unclassified WebKit WebKit2 WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=195102 InRadar P2 Normal --- 1 rniwa rniwa achristensen beidson cdumez ggaren tsavell oldest_to_newest 1508434 0 rniwa 2019-02-20 21:11:18 -0800 When clearing website data store, we should clear the process caches. Otherwise, the privacy sensitive information such as which site the user had visited may linger around. <rdar://problem/48243972> 1508435 1 362587 rniwa 2019-02-20 21:16:02 -0800 Created attachment 362587 Fixes the bug 1508436 2 362587 cdumez 2019-02-20 21:20:28 -0800 Comment on attachment 362587 Fixes the bug View in context: https://bugs.webkit.org/attachment.cgi?id=362587&action=review > Source/WebKit/ChangeLog:8 > + Clear the process cache when clearing the website data store so that Is there any reason we clear the process cache but keep suspended pages/processes? 1508438 3 362587 cdumez 2019-02-20 21:24:31 -0800 Comment on attachment 362587 Fixes the bug View in context: https://bugs.webkit.org/attachment.cgi?id=362587&action=review > Tools/TestWebKitAPI/Tests/WebKitCocoa/ProcessSwapOnNavigation.mm:2843 > + auto processPoolConfiguration = adoptNS([[_WKProcessPoolConfiguration alloc] init]); It would be better to use the convenience function in this file that returns a process pool configuration. You can always disable prewarming after calling it. 1508453 4 ggaren 2019-02-20 21:56:40 -0800 I didn't think about suspended pages because they're tied to the back forward list, and technically the client didn't ask to clear the back forward list. Still, might as well clear suspended pages too. 1508459 5 cdumez 2019-02-20 22:39:05 -0800 (In reply to Geoffrey Garen from comment #4) > I didn't think about suspended pages because they're tied to the back > forward list, and technically the client didn't ask to clear the back > forward list. > > Still, might as well clear suspended pages too. If the concern is leaking information via activity monitor, suspended pages actually more obviously leak domains than cached processes. 1508568 6 ggaren 2019-02-21 10:27:40 -0800 > If the concern is leaking information via activity monitor, suspended pages > actually more obviously leak domains than cached processes. Let's clear suspended pages too. Marking r- to reflect that request (and patch doesn't apply cleanly?) Clearing suspended pages seems like a reasonable interpretation of a request to clear the memory cache, and it's very unlikely to be a performance problem in practice, since the act of clearing the memory cache is rare. That said, just to explain the situation a bit more: I believe it's technically not an information leak to display a domain in Activity Monitor if the domain is already displayed in a window's back-forward list. What's unique about cached pages is that they reflect domains that are completely gone from any other user-visible presentation. 1508682 7 362650 rniwa 2019-02-21 14:56:27 -0800 Created attachment 362650 Clears the suspended pages 1508692 8 362650 cdumez 2019-02-21 15:13:31 -0800 Comment on attachment 362650 Clears the suspended pages View in context: https://bugs.webkit.org/attachment.cgi?id=362650&action=review > Source/WebKit/UIProcess/WebProcessCache.cpp:54 > + if (!capacity() || m_disabled) Is this patch based on ToT? Seems like this check should also be in addProcessIfNecessary(), not just addProcess(). > Source/WebKit/UIProcess/WebProcessCache.h:52 > + bool disabled() const { return m_disabled; } isDisabled() and m_isDisabled as per coding style. > Source/WebKit/UIProcess/WebProcessCache.h:53 > + void setDisabled(bool disabled) { m_disabled = disabled; } setIsDisabled(). > Source/WebKit/UIProcess/WebsiteData/WebsiteDataStore.cpp:783 > + ASSERT(!processPool->webProcessCache().disabled()); Wouldn't it be pretty easy to trigger this assertion by clearing website data twice in a row, without returning to the run loop? > Source/WebKit/UIProcess/WebsiteData/WebsiteDataStore.cpp:787 > + WTF::RunLoop::main().dispatch([pool = makeRef(*processPool)] { WTF:: should not be needed. Also, it seems like this should capture the callbackAggregator since we do not want to claim we're done until we've cleared the WebProcess cache. 1508698 9 rniwa 2019-02-21 15:23:26 -0800 (In reply to Chris Dumez from comment #8) > Comment on attachment 362650 [details] > Clears the suspended pages > > View in context: > https://bugs.webkit.org/attachment.cgi?id=362650&action=review > > > Source/WebKit/UIProcess/WebProcessCache.cpp:54 > > + if (!capacity() || m_disabled) > > Is this patch based on ToT? Seems like this check should also be in > addProcessIfNecessary(), not just addProcess(). Oh, I guess my checkout was old. Will fix. > > Source/WebKit/UIProcess/WebProcessCache.h:52 > > + bool disabled() const { return m_disabled; } > > isDisabled() and m_isDisabled as per coding style. Good catch. Will fix. > > Source/WebKit/UIProcess/WebProcessCache.h:53 > > + void setDisabled(bool disabled) { m_disabled = disabled; } > > setIsDisabled(). Ditto. > > Source/WebKit/UIProcess/WebsiteData/WebsiteDataStore.cpp:783 > > + ASSERT(!processPool->webProcessCache().disabled()); > > Wouldn't it be pretty easy to trigger this assertion by clearing website > data twice in a row, without returning to the run loop? > > > Source/WebKit/UIProcess/WebsiteData/WebsiteDataStore.cpp:787 > > + WTF::RunLoop::main().dispatch([pool = makeRef(*processPool)] { > > WTF:: should not be needed. > Also, it seems like this should capture the callbackAggregator since we do > not want to claim we're done until we've cleared the WebProcess cache. Hm... good point. I guess I'm gonna just restore the original value. 1508700 10 362650 cdumez 2019-02-21 15:28:56 -0800 Comment on attachment 362650 Clears the suspended pages View in context: https://bugs.webkit.org/attachment.cgi?id=362650&action=review >>> Source/WebKit/UIProcess/WebsiteData/WebsiteDataStore.cpp:783 >>> + ASSERT(!processPool->webProcessCache().disabled()); >> >> Wouldn't it be pretty easy to trigger this assertion by clearing website data twice in a row, without returning to the run loop? > > Hm... good point. I guess I'm gonna just restore the original value. Alternatively, it could be a "isClearingWebsiteData" flag on the WebProcessPool that the WebProcessCache would check. 1508738 11 362668 rniwa 2019-02-21 16:27:12 -0800 Created attachment 362668 Fixes the bug 1508740 12 362668 cdumez 2019-02-21 16:33:35 -0800 Comment on attachment 362668 Fixes the bug r=me 1508815 13 rniwa 2019-02-21 18:58:42 -0800 Committed r241928: <https://trac.webkit.org/changeset/241928> 1508890 14 362668 ggaren 2019-02-21 21:50:51 -0800 Comment on attachment 362668 Fixes the bug View in context: https://bugs.webkit.org/attachment.cgi?id=362668&action=review > Source/WebKit/UIProcess/WebsiteData/WebsiteDataStore.cpp:785 > + // FIXME: We need to delay the clearing of the process cache because ~SuspendedPageProxy() calls maybeShutDown asynchronously. This is pretty weird. :( 1508891 15 cdumez 2019-02-21 21:53:26 -0800 (In reply to Geoffrey Garen from comment #14) > Comment on attachment 362668 [details] > Fixes the bug > > View in context: > https://bugs.webkit.org/attachment.cgi?id=362668&action=review > > > Source/WebKit/UIProcess/WebsiteData/WebsiteDataStore.cpp:785 > > + // FIXME: We need to delay the clearing of the process cache because ~SuspendedPageProxy() calls maybeShutDown asynchronously. > > This is pretty weird. :( Yes, I will clean this up on trunk in a follow up. 1509002 16 tsavell 2019-02-22 08:43:38 -0800 The new API test ProcessSwap.NumberOfCachedProcesses added in https://trac.webkit.org/changeset/241928/webkit is failing on iOS. Build: https://build.webkit.org/builders/Apple%20iOS%2012%20Simulator%20Release%20WK2%20%28Tests%29/builds/2751 1509003 17 cdumez 2019-02-22 08:45:57 -0800 (In reply to Truitt Savell from comment #16) > The new API test ProcessSwap.NumberOfCachedProcesses > > added in https://trac.webkit.org/changeset/241928/webkit > > is failing on iOS. > > Build: > https://build.webkit.org/builders/ > Apple%20iOS%2012%20Simulator%20Release%20WK2%20%28Tests%29/builds/2751 Process cache is disabled on devices with less than 3GB of RAM, which likely includes the iOS simulator. We should probably disable the new test on iOS. 1509005 18 cdumez 2019-02-22 08:49:09 -0800 (In reply to Chris Dumez from comment #17) > (In reply to Truitt Savell from comment #16) > > The new API test ProcessSwap.NumberOfCachedProcesses > > > > added in https://trac.webkit.org/changeset/241928/webkit > > > > is failing on iOS. > > > > Build: > > https://build.webkit.org/builders/ > > Apple%20iOS%2012%20Simulator%20Release%20WK2%20%28Tests%29/builds/2751 > > Process cache is disabled on devices with less than 3GB of RAM, which likely > includes the iOS simulator. We should probably disable the new test on iOS. Done in <https://trac.webkit.org/changeset/241948>. 362587 2019-02-20 21:16:02 -0800 2019-02-21 14:56:26 -0800 Fixes the bug bug-194894-20190220211601.patch text/plain 7841 rniwa SW5kZXg6IFNvdXJjZS9XZWJLaXQvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIFNvdXJjZS9XZWJL aXQvQ2hhbmdlTG9nCShyZXZpc2lvbiAyNDE4NTQpCisrKyBTb3VyY2UvV2ViS2l0L0NoYW5nZUxv Zwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDIwIEBACisyMDE5LTAyLTIwICBSeW9zdWtlIE5p d2EgIDxybml3YUB3ZWJraXQub3JnPgorCisgICAgICAgIERpc2NhcmQgY2FjaGVkIHByb2Nlc3Nl cyB3aGVuIGNsZWFyaW5nIHdlYnNpdGUgZGF0YSBzdG9yZQorICAgICAgICBodHRwczovL2J1Z3Mu d2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MTk0ODk0CisKKyAgICAgICAgUmV2aWV3ZWQgYnkg Tk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgQ2xlYXIgdGhlIHByb2Nlc3MgY2FjaGUgd2hlbiBj bGVhcmluZyB0aGUgd2Vic2l0ZSBkYXRhIHN0b3JlIHNvIHRoYXQKKyAgICAgICAgdGhlcmUgaXMg bm8gd2F5IHRvIGluZmVyIHdoaWNoIHNpdGUgdGhlIHVzZXIgaGFkIHZpc2l0ZWQgYnkgb2JzZXJ2 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