130283 2014-03-14 20:31:12 -0700 Fix undefined behavior in WTF::equal() in StringImpl.h for i386/x86_64 2014-03-16 12:26:30 -0700 1 1 1 Unclassified WebKit Web Template Framework 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 ddkilzer ddkilzer andersca barraclough benjamin bfulgham cmarcelo commit-queue darin ggaren jonlee roger_fong oldest_to_newest 990800 0 ddkilzer 2014-03-14 20:31:12 -0700 When compiling WebKit with -fcatch-undefined-behavior (UBSan), Safari crashes on launch due to undefined behavior in WTF::equal() due to casting unaligned const char* bytes to unit64_t, uint32_t, etc. We can fix the unaligned access using memcpy, and clang will still optimize the code the exact same way (without calling memcpy for short lengths). 990801 1 ddkilzer 2014-03-14 20:31:29 -0700 <rdar://problem/16281477> 990804 2 226798 ddkilzer 2014-03-14 20:44:55 -0700 Created attachment 226798 i386 assembly before patch 990805 3 226799 ddkilzer 2014-03-14 20:45:33 -0700 Created attachment 226799 i386 assembly with patch 990806 4 226800 ddkilzer 2014-03-14 20:46:13 -0700 Created attachment 226800 x86_64 assembly before patch 990807 5 226801 ddkilzer 2014-03-14 20:46:50 -0700 Created attachment 226801 x86_64 assembly with patch 990810 6 226803 ddkilzer 2014-03-14 21:15:38 -0700 Created attachment 226803 Patch v1 990849 7 226803 ggaren 2014-03-15 00:51:22 -0700 Comment on attachment 226803 Patch v1 View in context: https://bugs.webkit.org/attachment.cgi?id=226803&action=review r=me > Source/WTF/wtf/text/StringImpl.h:919 > +inline T load_unaligned(const char* s) "loadUnaligned" 990865 8 ddkilzer 2014-03-15 08:21:52 -0700 Committed r165681: <http://trac.webkit.org/changeset/165681> 990889 9 226803 darin 2014-03-15 14:32:24 -0700 Comment on attachment 226803 Patch v1 View in context: https://bugs.webkit.org/attachment.cgi?id=226803&action=review > Source/WTF/wtf/text/StringImpl.h:926 > // Do comparisons 8 or 4 bytes-at-a-time on architectures where it's safe. I think that this patch renders this comment incorrect. We compile the version that does comparisons multiple bytes at a time on configurations where we believe it will compile to more efficient code than the baseline. Now that we are writing the efficient code in terms of memcpy, I think it may be “safe” everywhere. I’m not even sure the conditional is right anymore, since the code now depends on both the architecture and the compiler. For example, this may have made Windows X86_64 significantly slower. 990921 10 ddkilzer 2014-03-15 21:38:34 -0700 (In reply to comment #9) > (From update of attachment 226803 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=226803&action=review > > > Source/WTF/wtf/text/StringImpl.h:926 > > // Do comparisons 8 or 4 bytes-at-a-time on architectures where it's safe. > > I think that this patch renders this comment incorrect. We compile the version that does comparisons multiple bytes at a time on configurations where we believe it will compile to more efficient code than the baseline. Now that we are writing the efficient code in terms of memcpy, I think it may be “safe” everywhere. I’m not even sure the conditional is right anymore, since the code now depends on both the architecture and the compiler. For example, this may have made Windows X86_64 significantly slower. Can someone attach assembly output for WTF::stringImplContentEqual() (__ZN3WTFL22stringImplContentEqualERKNS_10StringImplES2_) for Windows? It would likely be sufficient to check if Visual C++ is smart enough to optimize out the memcpy calls from the function. Some options are: 1. Add a check for the clang compiler for the conforming implementation, and (optionally) add back the non-conforming ones for other compilers on the same architectures. 2. Back out this patch, then go with Darin's suggestion in Radar to add some kind of macro to make sure it's possible to use the slower memcmp() methods when compiling with -fcatch-undefined-behavior. I would prefer #1, although it bloats the code a bit more. 990939 11 darin 2014-03-16 00:56:25 -0700 (In reply to comment #10) > I would prefer #1, although it bloats the code a bit more. I strongly prefer #1. 990990 12 ddkilzer 2014-03-16 11:27:51 -0700 (In reply to comment #11) > (In reply to comment #10) > > I would prefer #1, although it bloats the code a bit more. > > I strongly prefer #1. I thought of a more targeted fix this morning: template<typename T> inline T loadUnaligned(const char* s) { +#if COMPILER(CLANG) T tmp; memcpy(&tmp, s, sizeof(T)); return tmp; +#else + // This may result in undefined behavior due to an unaligned access. + return *reinterpret_cast<const T*>(s); +#endif } 990993 13 ddkilzer 2014-03-16 11:39:59 -0700 Re-opening for follow-up fix. 990998 14 226849 ddkilzer 2014-03-16 11:46:27 -0700 Created attachment 226849 Patch for follow-up issue Patch to restore behavior prior to <http://trac.webkit.org/r165681> for non-clang compilers. 991007 15 226849 commit-queue 2014-03-16 12:26:25 -0700 Comment on attachment 226849 Patch for follow-up issue Clearing flags on attachment: 226849 Committed r165706: <http://trac.webkit.org/changeset/165706> 991008 16 commit-queue 2014-03-16 12:26:30 -0700 All reviewed patches have been landed. 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