179936 2017-11-21 22:16:38 -0800 Fix CLoop::sanitizeStack() bug where it was clearing part of the JS stack in use. 2017-11-24 13:06:43 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Local Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 mark.lam mark.lam aestes commit-queue fpizlo jfbastien keith_miller msaboff rmorisset saam webkit-bug-importer ysuzuki oldest_to_newest 1374136 0 mark.lam 2017-11-21 22:16:38 -0800 This issue was uncovered when we enabled --useDollarVM=true on the JSC tests. Basically, the case of the failing test we observed, op_tail_call_forward_arguments was allocating stack space to stash the arguments (to be forwarded) and new frame info. The location of this new stash space happens to lie beyond the top of frame of the tail call caller frame. After stashing the arguments, the code proceeded to load the callee codeBlock. This triggers an allocation, which in turn, triggers stack sanitization. The CLoop stack sanitizer was relying on frame->topOfFrame() to tell it where the top of the used stack is. In this case, that turned out to be inadequate. As a result, part of the stashed data was zeroed out, and subsequently led to a crash. This bug does not affect JIT builds for 2 reasons: 1. JIT builds do stack sanitization in the LLInt code itself (different from the CLoop implementation), and the sanitizer there is aware of the true top of stack value (i.e. the stack pointer). 2. JIT builds don't use a parallel stack like the CLoop. The parallel stack is one condition necessary for reproducing this issue. The fix is to make the CLoop record the stack pointer in m_stackTop each time before it calls out to native code. This also brings the CLoops behavior closer to hardware behavior where we always know where the stack pointer is after calling into native C++ code, and make it easier to reason about correctness. <rdar://problem/35623998> 1374156 1 327446 mark.lam 2017-11-21 23:50:59 -0800 Created attachment 327446 proposed patch. 1374630 2 327446 saam 2017-11-24 12:40:48 -0800 Comment on attachment 327446 proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=327446&action=review > Source/JavaScriptCore/ChangeLog:43 > + highAddress(): the highest address just beyond the bounds of the stack. So this value minus one is the stack base? 1374632 3 327446 commit-queue 2017-11-24 13:02:04 -0800 Comment on attachment 327446 proposed patch. Clearing flags on attachment: 327446 Committed r225140: <https://trac.webkit.org/changeset/225140> 1374633 4 commit-queue 2017-11-24 13:02:06 -0800 All reviewed patches have been landed. Closing bug. 1374634 5 mark.lam 2017-11-24 13:06:43 -0800 (In reply to Saam Barati from comment #2) > Comment on attachment 327446 [details] > proposed patch. > > View in context: > https://bugs.webkit.org/attachment.cgi?id=327446&action=review > > > Source/JavaScriptCore/ChangeLog:43 > > + highAddress(): the highest address just beyond the bounds of the stack. > > So this value minus one is the stack base? highAddress() points just beyond the stack. highAddress() - 1 points to the first Register slot on the stack. If the stackPointer points to highAddress(), then the stack is empty. 327446 2017-11-21 23:50:59 -0800 2017-11-24 13:02:04 -0800 proposed patch. bug-179936.patch text/plain 16423 mark.lam SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMjI1MDkzKQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDg5IEBA CisyMDE3LTExLTIxICBNYXJrIExhbSAgPG1hcmsubGFtQGFwcGxlLmNvbT4KKworICAgICAgICBG aXggQ0xvb3A6OnNhbml0aXplU3RhY2soKSBidWcgd2hlcmUgaXQgd2FzIGNsZWFyaW5nIHBhcnQg b2YgdGhlIEpTIHN0YWNrIGluIHVzZS4KKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcv c2hvd19idWcuY2dpP2lkPTE3OTkzNgorICAgICAgICA8cmRhcjovL3Byb2JsZW0vMzU2MjM5OTg+ CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgVGhpcyBp c3N1ZSB3YXMgdW5jb3ZlcmVkIHdoZW4gd2UgZW5hYmxlZCAtLXVzZURvbGxhclZNPXRydWUgb24g 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