182086 2018-01-24 23:48:09 -0800 DirectArguments should protect itself using dynamic poisoning and precise index masking 2018-01-25 17:37:48 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build All All RESOLVED FIXED InRadar P2 Normal --- 1 fpizlo fpizlo benjamin cdumez cmarcelo dbates ews-watchlist jlewis3 keith_miller mark.lam msaboff saam webkit-bug-importer oldest_to_newest 1392937 0 fpizlo 2018-01-24 23:48:09 -0800 Patch forthcoming. 1392939 1 332233 fpizlo 2018-01-24 23:54:32 -0800 Created attachment 332233 maybe the patch 1393300 2 332319 fpizlo 2018-01-25 14:44:32 -0800 Created attachment 332319 the patch 1393322 3 332319 saam 2018-01-25 15:25:10 -0800 Comment on attachment 332319 the patch View in context: https://bugs.webkit.org/attachment.cgi?id=332319&action=review r=me w/ some naming nits and other tidbits > Source/JavaScriptCore/runtime/DirectArguments.h:122 > + return *preciseIndexMaskPtr(offset.offset(), std::max(m_length, m_minCapacity), dynamicPoison(type(), DirectArgumentsType, ptr)); could this max() be spectre trained in a way that hurts us? > Source/WTF/wtf/MathExtras.h:492 > +inline unsigned preciseIndexMaskShiftForSize(unsigned size) > +{ > + return size * 8 - 1; > +} > + > +template<typename T> > +unsigned preciseIndexMaskShift() > +{ > + return preciseIndexMaskShiftForSize(sizeof(T)); > +} constexpr for both of these? > Source/WTF/wtf/MathExtras.h:497 > + asm("" : "+r"(pointer)); asm volatile? > Source/WTF/wtf/MathExtras.h:516 > + (static_cast<uintptr_t>(opaque(actual) ^ expected) << 40)); Is it worth giving this 40 a name since it's hard coded inside JSC in a few places too? 1393325 4 fpizlo 2018-01-25 15:35:02 -0800 (In reply to Saam Barati from comment #3) > Comment on attachment 332319 [details] > the patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=332319&action=review > > r=me w/ some naming nits and other tidbits > > > Source/JavaScriptCore/runtime/DirectArguments.h:122 > > + return *preciseIndexMaskPtr(offset.offset(), std::max(m_length, m_minCapacity), dynamicPoison(type(), DirectArgumentsType, ptr)); > > could this max() be spectre trained in a way that hurts us? No. At worst, you'll get a smaller limit. > > > Source/WTF/wtf/MathExtras.h:492 > > +inline unsigned preciseIndexMaskShiftForSize(unsigned size) > > +{ > > + return size * 8 - 1; > > +} > > + > > +template<typename T> > > +unsigned preciseIndexMaskShift() > > +{ > > + return preciseIndexMaskShiftForSize(sizeof(T)); > > +} > > constexpr for both of these? I'll try that. > > > Source/WTF/wtf/MathExtras.h:497 > > + asm("" : "+r"(pointer)); > > asm volatile? I don't need it to be volatile. > > > Source/WTF/wtf/MathExtras.h:516 > > + (static_cast<uintptr_t>(opaque(actual) ^ expected) << 40)); > > Is it worth giving this 40 a name since it's hard coded inside JSC in a few > places too? I'll do that. 1393330 5 332327 fpizlo 2018-01-25 15:46:15 -0800 Created attachment 332327 patch for landing 1393335 6 webkit-bug-importer 2018-01-25 16:08:23 -0800 <rdar://problem/36887421> 1393336 7 fpizlo 2018-01-25 16:08:32 -0800 Landed in https://trac.webkit.org/changeset/227643/webkit 1393349 8 332327 mark.lam 2018-01-25 16:30:44 -0800 Comment on attachment 332327 patch for landing View in context: https://bugs.webkit.org/attachment.cgi?id=332327&action=review > Source/JavaScriptCore/jit/AssemblyHelpers.cpp:1049 > + UNUSED_PARAM(actualValue); This is a typo, and as a result, you're breaking the 32-bit builds. 1393354 9 332327 mark.lam 2018-01-25 16:42:39 -0800 Comment on attachment 332327 patch for landing View in context: https://bugs.webkit.org/attachment.cgi?id=332327&action=review >> Source/JavaScriptCore/jit/AssemblyHelpers.cpp:1049 >> + UNUSED_PARAM(actualValue); > > This is a typo, and as a result, you're breaking the 32-bit builds. Fixed 32-bit build in r227644: <https://trac.webkit.org/r227644>. 1393377 10 jlewis3 2018-01-25 17:31:56 -0800 This also broke the windows build. Looks like its a syntax error and another error: MathExtras.h(497): error C2059: syntax error: ':' https://build.webkit.org/builders/Apple%20Win%20Release%20%28Build%29/builds/7382 1393378 11 fpizlo 2018-01-25 17:37:48 -0800 (In reply to Matt Lewis from comment #10) > This also broke the windows build. > > Looks like its a syntax error and another error: > > MathExtras.h(497): error C2059: syntax error: ':' > > https://build.webkit.org/builders/Apple%20Win%20Release%20%28Build%29/builds/ > 7382 Fixed in https://trac.webkit.org/changeset/227648/webkit 332233 2018-01-24 23:54:32 -0800 2018-01-25 14:44:32 -0800 maybe the patch blah.patch text/plain 18934 fpizlo SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMjI3NTk1KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDQwIEBA 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