41431 2010-06-30 15:12:41 -0700 REGRESSION (r49411): Various crashes due to JavaScript execution during plug-in destruction 2018-01-19 16:30:29 -0800 1 1 1 Unclassified WebKit Plug-ins 528+ (Nightly build) Mac (Intel) OS X 10.6 RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=181889 InRadar P2 Normal --- 1 ap ap andersca mitz mrowe oldest_to_newest 244965 0 ap 2010-06-30 15:12:41 -0700 We didn't use to support executing arbitrary JavaScript code during plug-in destruction in out of process case. This got accidentally enabled in r49411. Long term, we should do the same thing in in process and out of process cases, and the same as other browsers - which likely means allowing JS execution from NPP_Destroy (although there are lots of bugs and limitations there). But there is an unfortunate twist for out of process plug-ins, which makes WebKit take this code path even if plug-in didn't intend that: 1) Plug-in executes NPN_Evaluate, a sync message is sent to the browser. 2) At the same time, the browser stops the plug-in, and sends synchronous NPP_Destroy to plug-in. 3) The browser enters a loop, handling messages that come from plug-in, and waiting for a response to NPP_Destroy. 4) So, it executes the script from step 1 that could have been dropped. 244966 1 ap 2010-06-30 15:13:01 -0700 <rdar://problem/8148656> 244991 2 60164 ap 2010-06-30 16:14:01 -0700 Created attachment 60164 proposed fix 245008 3 ap 2010-06-30 16:43:27 -0700 - waitForReply<NetscapePluginInstanceProxy::BooleanReply>(requestID); + waitForReplyDroppingOtherMessages<NetscapePluginInstanceProxy::BooleanReply>(requestID); Oops, this doesn't belong here. 245413 4 60261 ap 2010-07-01 10:29:26 -0700 Created attachment 60261 an alternative WebKit part of the fix WebCore and LayoutTests parts are unchanged, not putting them up for review again. 245422 5 60261 andersca 2010-07-01 10:43:49 -0700 Comment on attachment 60261 an alternative WebKit part of the fix r=me 245454 6 ap 2010-07-01 11:48:57 -0700 Committed with alternative WebKit fix in <http://trac.webkit.org/changeset/62279>. 60164 2010-06-30 16:14:01 -0700 2010-06-30 16:36:12 -0700 proposed fix NPP_Destroy.txt text/plain 14846 ap SW5kZXg6IFdlYkNvcmUvQ2hhbmdlTG9nCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIFdlYkNvcmUvQ2hhbmdlTG9n CShyZXZpc2lvbiA2MjIwNykKKysrIFdlYkNvcmUvQ2hhbmdlTG9nCSh3b3JraW5nIGNvcHkpCkBA IC0xLDMgKzEsMjAgQEAKKzIwMTAtMDYtMzAgIEFsZXhleSBQcm9za3VyeWFrb3YgIDxhcEBhcHBs ZS5jb20+CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAg PHJkYXI6Ly9wcm9ibGVtLzgxNDg2NTY+IDxodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1 Zy5jZ2k/aWQ9NDE0MzE+CisgICAgICAgIFJFR1JFU1NJT04gKHI0OTQxMSk6IFZhcmlvdXMgY3Jh 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