180363 2017-12-04 10:03:03 -0800 WTF Hasher: disallow -0. and NaNs 2018-02-01 10:09:01 -0800 1 1 1 Unclassified WebKit Web Template Framework WebKit Nightly Build Unspecified Unspecified RESOLVED WONTFIX P2 Normal --- 180318 1 jfbastien jfbastien achristensen benjamin cdumez cmarcelo darin dbates ews-watchlist jfbastien mmaxfield sam oldest_to_newest 1377732 0 jfbastien 2017-12-04 10:03:03 -0800 I want to see if we can just outright disallow them by adding a debug check that we never hash them. This is based on a discussion here: https://bugs.webkit.org/show_bug.cgi?id=180318 Let's see what the tests say, and if anyone has opinions. Original comment: I've been thinking about this, and I think there are 3 things we could plausibly want: 1. Deal with bits only, treating -0. != +0. and all NaNs with different payload as different (and same payload as the same). 2. Deal with IEEE-754 semantics, treating -0. == +0., and all NaNs as different. 3. Ban -0. and all NaNs from hashing. I think these all make sense in different context, but choosing 1. and 2. requires knowing what situation we're in! It seems like 3. is the most conservative thing to do if we don't know how hashing is used. 1377734 1 328355 jfbastien 2017-12-04 10:04:34 -0800 Created attachment 328355 patch 1377772 2 328362 jfbastien 2017-12-04 10:47:54 -0800 Created attachment 328362 patch Fix typo. 1377834 3 328377 jfbastien 2017-12-04 12:46:17 -0800 Created attachment 328377 patch Missing include. 1377838 4 ews-watchlist 2017-12-04 12:49:18 -0800 Attachment 328377 did not pass style-queue: ERROR: Source/WTF/wtf/Hasher.h:26: Alphabetical sorting problem. [build/include_order] [4] Total errors found: 1 in 2 files If any of these errors are false positives, please file a bug against check-webkit-style. 1377986 5 328406 jfbastien 2017-12-04 16:29:21 -0800 Created attachment 328406 patch Comment out long-running test. FWIW I also test that all 16-bit values hash uniquely (they do) and that the collision rate is low for 32-bit values (it's 3%). I haven't checked the clustering of collisions in 32-bit. Presumably if we wanted to prevent hashflood we'd use another hash and we would mix in a per-process salt anyways. 1395529 6 jfbastien 2018-02-01 10:09:01 -0800 Not sure we want to do this. Closing. 328355 2017-12-04 10:04:34 -0800 2017-12-04 10:47:54 -0800 patch 0001-WTF-Hasher-disallow-0.-and-NaNs.patch text/plain 3896 jfbastien RnJvbSBhYTcyNzk3ODYxMDU5MmY4NGQ4NTllOTE5MWFjZGFkYjJlNWVlMWQ0IE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBKRiBCYXN0aWVuIDxqZmJhc3RpZW5AYXBwbGUuY29tPgpEYXRl OiBNb24sIDQgRGVjIDIwMTcgMTA6MDQ6MDMgLTA4MDAKU3ViamVjdDogW1BBVENIXSBXVEYgSGFz aGVyOiBkaXNhbGxvdyAtMC4gYW5kIE5hTnMKCi0tLQogU291cmNlL1dURi93dGYvSGFzaGVyLmgg ICAgICAgICAgICAgICAgICB8IDE3ICsrKysrKysrKysrKysrKysrCiBUb29scy9UZXN0V2ViS2l0 QVBJL1Rlc3RzL1dURi9IYXNoZXIuY3BwIHwgMTQgKysrKysrKysrKy0tLS0KIDIgZmlsZXMgY2hh bmdlZCwgMjcgaW5zZXJ0aW9ucygrKSwgNCBkZWxldGlvbnMoLSkKCmRpZmYgLS1naXQgYS9Tb3Vy Y2UvV1RGL3d0Zi9IYXNoZXIuaCBiL1NvdXJjZS9XVEYvd3RmL0hhc2hlci5oCmluZGV4IDhhMDk0 M2UuLjdiZTIyNzUgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XVEYvd3RmL0hhc2hlci5oCisrKyBiL1Nv dXJjZS9XVEYvd3RmL0hhc2hlci5oCkBAIC05MCwxMSArOTAsMjggQEAgdGVtcGxhdGU8dHlwZW5h bWUgU2lnbmVkQXJpdGhtZXRpYz4gc3RkOjplbmFibGVfaWZfdDxzdGQ6OmlzX3NpZ25lZDxTaWdu 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