90053 2012-06-27 00:44:26 -0700 Javascript SHA-512 gives wrong hash on second and subsequent runs unless Web Inspector Javascript Debugging is on 2012-06-27 22:16:07 -0700 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Mac (Intel) OS X 10.7 RESOLVED FIXED InRadar P2 Normal --- 1 bi5FiEJOYWtA fpizlo fpizlo mrowe oldest_to_newest 658423 0 149698 bi5FiEJOYWtA 2012-06-27 00:44:26 -0700 Created attachment 149698 Peasy test code and two Javasc SHA-512 implems (Test file enc.) If I run Javasc SHA-512 twice or more on a Webkit browser, only the first hash is correct. Ironically, this means the usual hash method of an initial test won't work because that passes but the real one then mismatches. The test file runs two different SHA-512 implems, hashing the word "test" separately eight times for each. On non-Webk browsers (eg, Firefox) all 16 hashes are identical and match the expected result. On Webk browsers (eg, iCab) the first in each set are correct, but the remaining 14 are wrong -- but match each other. Tiny Webkit (eg, Mobile Safari) is fine. The beardy-weirdy thing is that I discovered by chance the tests work if you switch on Javasc Debugging in the Web Inspector. (My wild guess is that the non-debug Javasc is optimised to the point of reusing some info it should have cleared instead. This would explain why it's the same incorrect hash each time rather than random results.) If the test file doesn't work, you can also see the effect at http://jssha.sourceforge.net/ -- input "test" in the Hashing Demo section and select SHA-512. Now delete and retype "test" and the hash changes. Switch on Javasc Debugging and try again and the hash is solid. 658843 1 fpizlo 2012-06-27 13:49:37 -0700 (In reply to comment #0) > Created an attachment (id=149698) [details] > Peasy test code and two Javasc SHA-512 implems > > (Test file enc.) > > If I run Javasc SHA-512 twice or more on a Webkit browser, only the first hash is correct. Ironically, this means the usual hash method of an initial test won't work because that passes but the real one then mismatches. > > The test file runs two different SHA-512 implems, hashing the word "test" separately eight times for each. On non-Webk browsers (eg, Firefox) all 16 hashes are identical and match the expected result. On Webk browsers (eg, iCab) the first in each set are correct, but the remaining 14 are wrong -- but match each other. > > Tiny Webkit (eg, Mobile Safari) is fine. > > The beardy-weirdy thing is that I discovered by chance the tests work if you switch on Javasc Debugging in the Web Inspector. (My wild guess is that the non-debug Javasc is optimised to the point of reusing some info it should have cleared instead. This would explain why it's the same incorrect hash each time rather than random results.) > > If the test file doesn't work, you can also see the effect at http://jssha.sourceforge.net/ -- input "test" in the Hashing Demo section and select SHA-512. Now delete and retype "test" and the hash changes. Switch on Javasc Debugging and try again and the hash is solid. Thanks for finding this! JavaScriptCore has roughly speaking two ways of executing JS code: the baseline way (unoptimized) and the DFG way (DFG = Data Flow Graph JIT, i.e. optimized). We switch between baseline and DFG on the fly. They are *supposed* to execute code identically modulo that DFG is faster. What you found is almost certainly a DFG bug - it is failing to obey correct JS semantics, and hence appears to execute code differently than baseline. Because the DFG kicks in only after your code has executed for some time, it is often the case that the first execution will run in baseline and subsequent executions run in DFG. Hence your observation that the first run is right but the others are wrong. Currently, turning on the debugger turns off the DFG. Hence your observation that turning on the debugger "fixes" the problem. I'll try to fix this ASAP. And again, thanks for the detailed bug report. 658950 2 fpizlo 2012-06-27 16:17:49 -0700 Found the problem: it appears that our logic for recovering unsigned 32-bit integers on OSR exit is totally broken. :-/ I'm in the process of testing a patch to unbreak it, and return it to its former glory. 658956 3 fpizlo 2012-06-27 16:33:11 -0700 <rdar://problem/11764613> 658962 4 149818 fpizlo 2012-06-27 16:41:25 -0700 Created attachment 149818 the patch 658973 5 149818 mhahnenberg 2012-06-27 16:52:26 -0700 Comment on attachment 149818 the patch r=me 659020 6 fpizlo 2012-06-27 17:51:53 -0700 Landed in http://trac.webkit.org/changeset/121391 659189 7 bi5FiEJOYWtA 2012-06-27 22:16:07 -0700 Hurrah! Trem exc. Thanks for the fix and the interesting explan. (By coincidence the Blowfish Javasc I was playing with alongside SHA-512 turned out to have a slight bug in the implem -- nothing to do with Webk -- so neither popular well-established lib worked and I thought I'd gone bonkers.) 149698 2012-06-27 00:44:26 -0700 2012-06-27 00:44:26 -0700 Peasy test code and two Javasc SHA-512 implems sha512_test.html text/html 25068 bi5FiEJOYWtA PCFET0NUWVBFIEhUTUwgUFVCTElDICItLy9XM0MvL0RURCBIVE1MIDQuMDEgVHJhbnNpdGlvbmFs Ly9FTiIgImh0dHA6Ly93d3cudzMub3JnL1RSL2h0bWw0L2xvb3NlLmR0ZCI+CjxodG1sPgo8aGVh ZD4KPHRpdGxlPnNoYTUxMiB0ZXN0PC90aXRsZT4KCjxzY3JpcHQgdHlwZT0idGV4dC9qYXZhc2Ny aXB0Ij48IS0tCgpmdW5jdGlvbiB0ZXN0X2pzc2hhKCkKewovLyBzZXQKdmFyIGY7CnZhciB0ZXN0 X3RleHQgPSAidGVzdCI7CnZhciB0ZXN0X2tub3duID0gImVlMjZiMGRkNGFmN2U3NDlhYTFhOGVl M2MxMGFlOTkyM2Y2MTg5ODA3NzJlNDczZjg4MTlhNWQ0OTQwZTBkYjI3YWMxODVmOGEwZTFkNWY4 NGY4OGJjODg3ZmQ2N2IxNDM3MzJjMzA0Y2M1ZmE5YWQ4ZTZmNTdmNTAwMjhhOGZmIjsKCi8vIHJ1 biAoYnQgdmVyc2lvbikKZm9yIChmID0gMDsgZiA8IDg7IGYgKyspCnsKLy8gc2V0CnRlc3RfYnQg 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