96047 2012-09-06 17:52:37 -0700 JSC should have a zombie mode 2012-09-07 10:15:11 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED P2 Normal --- 1 mhahnenberg mhahnenberg ap fpizlo ggaren webkit.review.bot oldest_to_newest 713926 0 mhahnenberg 2012-09-06 17:52:37 -0700 To aid client of JSC as well as the developers of JSC, we should add a zombie mode that scribbles into objects in the MarkedSpace after they are found to be dead to prevent a sort of "use after free" situation. As a first cut we should support a mode that just scribbles on objects prior to their being reused (i.e. while they are "zombies") and a mode in which, in addition to scribbling on zombies, once an object has been marked its mark bit will never be cleared, thus giving us "immortal" zombies. 713934 1 mhahnenberg 2012-09-06 17:54:48 -0700 I should also mention that these two modes will be enabled through the use of environment variables. For now these will be "JSZombieEnabled" and "JSImmortalZombieEnabled". Setting them to any value will result in the use of the appropriate mode. 713943 2 162633 mhahnenberg 2012-09-06 18:05:11 -0700 Created attachment 162633 Patch 713954 3 162633 ggaren 2012-09-06 18:14:25 -0700 Comment on attachment 162633 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=162633&action=review Looks good, but you have a bug. > Source/JavaScriptCore/heap/Heap.cpp:850 > +class ZombifyCellFunctor : public MarkedBlock::VoidFunctor { Add a data member that causes us optionally set the mark bit as we zombify, if in immortal mode. > Source/JavaScriptCore/heap/MarkedBlock.h:313 > + inline void MarkedBlock::zombieClearMarks() Remove this. 713963 4 162638 mhahnenberg 2012-09-06 18:27:39 -0700 Created attachment 162638 Patch 713967 5 162638 ggaren 2012-09-06 18:29:52 -0700 Comment on attachment 162638 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=162638&action=review > Source/JavaScriptCore/heap/Heap.cpp:741 > + if (Options::useZombieMode() || sweepToggle == DoSweep) { Looking at this again, I don't think you can piggy-back on this for zombies. If the call to shrink unmaps some blocks, they may remap into the heap later, failing to be immortal zombies. I think you should just add a call to sweep() inside zombifyDeadObjects(). 713976 6 162642 mhahnenberg 2012-09-06 18:36:14 -0700 Created attachment 162642 Patch 713987 7 162642 ggaren 2012-09-06 18:43:41 -0700 Comment on attachment 162642 Patch r=me 714139 8 162642 webkit.review.bot 2012-09-06 22:53:02 -0700 Comment on attachment 162642 Patch Clearing flags on attachment: 162642 Committed r127829: <http://trac.webkit.org/changeset/127829> 714140 9 webkit.review.bot 2012-09-06 22:53:05 -0700 All reviewed patches have been landed. Closing bug. 714669 10 ap 2012-09-07 10:15:11 -0700 This seems worth a blog post, or at very least a webkit-dev one. 162633 2012-09-06 18:05:11 -0700 2012-09-06 18:27:38 -0700 Patch bug-96047-20120906180452.patch text/plain 9660 mhahnenberg SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTI3ODA2KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDUxIEBA CisyMDEyLTA5LTA2ICBNYXJrIEhhaG5lbmJlcmcgIDxtaGFobmVuYmVyZ0BhcHBsZS5jb20+CisK KyAgICAgICAgSlNDIHNob3VsZCBoYXZlIGEgem9tYmllIG1vZGUKKyAgICAgICAgaHR0cHM6Ly9i dWdzLndlYmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTk2MDQ3CisKKyAgICAgICAgUmV2aWV3ZWQg YnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgVG8gYWlkIGNsaWVudHMgb2YgSlNDIHdoaWxl IHRoZXkgYXJlIGRlYnVnZ2luZyBtZW1vcnkgaXNzdWVzLCB3ZSBzaG91bGQgYWRkIGEgem9tYmll 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