229674 2021-08-30 10:45:50 -0700 Null pointer dereference in JSC::GetByStatus 2021-09-22 23:59:04 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 mikhail webkit-unassigned bfulgham ews-feeder mark.lam product-security webkit-bug-importer ysuzuki oldest_to_newest 1788565 0 mikhail 2021-08-30 10:45:50 -0700 In GetByStatus::computeForStubInfoWithoutExitSiteFeedback, there are several places that dereference the stubInfo argument when calling the GetByStatus constructor. Here's the backtrace: #0 JSC::GetByStatus::GetByStatus (this=0xfffe9438, summary=JSC::StubInfoSummary::NoInformation, stubInfo=0x0) at ../../Source/JavaScriptCore/bytecode/GetByStatus.cpp:177 #1 0xf27896e6 in JSC::GetByStatus::computeForStubInfoWithoutExitSiteFeedback (locker=..., profiledBlock=0xec49b560, stubInfo=0x0, callExitSiteData=...) at ../../Source/JavaScriptCore/bytecode/GetByStatus.cpp:207 #2 0xf2788fa4 in JSC::GetByStatus::computeFor (profiledBlock=0xec49b560, map=..., bytecodeIndex=..., didExit=..., callExitSiteData=...) at ../../Source/JavaScriptCore/bytecode/GetByStatus.cpp:155 #3 0xf278aeb4 in JSC::GetByStatus::computeFor (profiledBlock=0xec49b560, baselineMap=..., icContextStack=..., codeOrigin=...) at ../../Source/JavaScriptCore/bytecode/GetByStatus.cpp:402 #4 0xf2c1d286 in JSC::DFG::ByteCodeParser::parseBlock (this=0xfffecd6c, limit=251) at ../../Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp:6278 #5 0xf2c60b34 in JSC::DFG::ByteCodeParser::parseCodeBlock (this=0xfffecd6c) at ../../Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp:8804 #6 0xf2c61c18 in JSC::DFG::ByteCodeParser::parse (this=0xfffecd6c) at ../../Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp:9006 #7 0xf2c64000 in JSC::DFG::parse (graph=...) at ../../Source/JavaScriptCore/dfg/DFGByteCodeParser.cpp:9165 #8 0xf31f490a in JSC::DFG::Plan::compileInThreadImpl (this=0xeb01e8d0) at ../../Source/JavaScriptCore/dfg/DFGPlan.cpp:199 #9 0xf4055450 in JSC::JITPlan::compileInThread (this=0xeb01e8d0, thread=0x0) at ../../Source/JavaScriptCore/jit/JITPlan.cpp:165 #10 0xf40ed054 in JSC::JITWorklist::enqueue (this=0xedcc71b0, plan=...) at ../../Source/JavaScriptCore/jit/JITWorklist.cpp:83 #11 0xf2f5931a in JSC::DFG::compileImpl (vm=..., codeBlock=0xec49aca0, profiledDFGCodeBlock=0x0, mode=JSC::JITCompilationMode::DFG, osrEntryBytecodeIndex=..., mustHandleValues=..., callback=...) at ../../Source/JavaScriptCore/dfg/DFGDriver.cpp:90 #12 0xf2f5944a in JSC::DFG::compile (vm=..., codeBlock=0xec49aca0, profiledDFGCodeBlock=0x0, mode=JSC::JITCompilationMode::DFG, osrEntryBytecodeIndex=..., mustHandleValues=..., callback=...) at ../../Source/JavaScriptCore/dfg/DFGDriver.cpp:106 #13 0xf4045c08 in JSC::operationOptimize (vmPointer=0xecaf5000, bytecodeIndexBits=0) at ../../Source/JavaScriptCore/jit/JITOperations.cpp:2096 #14 0xecc320aa in ?? () 1788566 1 webkit-bug-importer 2021-08-30 10:46:04 -0700 <rdar://problem/82535652> 1788570 2 436793 mikhail 2021-08-30 10:53:06 -0700 Created attachment 436793 Patch 1795225 3 436793 ysuzuki 2021-09-20 13:04:05 -0700 Comment on attachment 436793 Patch Can you upload a test for review too? (while, maybe, we should not land it together) 1795226 4 ysuzuki 2021-09-20 13:05:01 -0700 (In reply to Yusuke Suzuki from comment #3) > Comment on attachment 436793 [details] > Patch > > Can you upload a test for review too? (while, maybe, we should not land it > together) I'm assuming that you found this bug based on some tests. 1795237 5 438719 mikhail 2021-09-20 13:26:13 -0700 Created attachment 438719 Test Sure, that's the testcase. 1795241 6 mikhail 2021-09-20 13:31:43 -0700 It was found by our fuzzer, let me know if you need a reduced testcase. I reproduced the null pointer dereference in mips, armv7 and x86_64. I didn't test it in arm 64. 1795651 7 436793 ysuzuki 2021-09-21 10:53:37 -0700 Comment on attachment 436793 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=436793&action=review r=me > Source/JavaScriptCore/bytecode/GetByStatus.cpp:184 > + RELEASE_ASSERT(stubInfo); Make it ASSERT. I don't think it is worth RELEASE_ASSERT. > Source/JavaScriptCore/bytecode/GetByStatus.cpp:188 > + RELEASE_ASSERT(stubInfo); Ditto. 1795660 8 438837 mikhail 2021-09-21 11:06:24 -0700 Created attachment 438837 Patch 1796376 9 mark.lam 2021-09-22 23:31:22 -0700 Is this patch ready to land? 1796379 10 ysuzuki 2021-09-22 23:42:00 -0700 This crash does not happen in usual build, so changing it to non security issue. 1796381 11 ews-feeder 2021-09-22 23:58:59 -0700 Committed r282950 (242040@main): <https://commits.webkit.org/242040@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 438837. 436793 2021-08-30 10:53:06 -0700 2021-09-21 11:06:20 -0700 Patch bug-229674-20210830175305.patch text/plain 9874 mikhail U3VidmVyc2lvbiBSZXZpc2lvbjogMjgxNjk0CmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCBm NmZiYTg4MjJhZGU2MWRlYTk5NTcxYTc0M2Q4MTRlYzNhM2I5YWI2Li4yNDk3ZDVjNDM2MmJkY2Q4 NWViMGQ1YmM0Y2MzNzJjODNmMGIzZDExIDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSwyMSBAQAorMjAyMS0wOC0zMCAgTWlraGFpbCBSLiBHYWRlbGhhICA8bWlraGFpbEBpZ2Fs aWEuY29tPgorCisgICAgICAgIE51bGwgcG9pbnRlciBkZXJlZmVyZW5jZSBpbiBKU0M6OkdldEJ5 U3RhdHVzCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0y Mjk2NzQKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKworICAgICAgICBJ biBHZXRCeVN0YXR1czo6Y29tcHV0ZUZvclN0dWJJbmZvV2l0aG91dEV4aXRTaXRlRmVlZGJhY2ss 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