209485 2020-03-24 11:39:17 -0700 Division by zero in RenderBlockFlow::computeColumnCountAndWidth 2020-03-30 11:24:39 -0700 1 1 1 Unclassified WebKit Layout and Rendering WebKit Nightly Build All All RESOLVED FIXED InRadar P2 Normal --- 1 shihchieh_lee webkit-unassigned bfulgham ews-feeder product-security rniwa simon.fraser webkit-bug-importer zalan oldest_to_newest 1633400 0 shihchieh_lee 2020-03-24 11:39:17 -0700 <rdar://60746109> #0 0x11f4297bd in WebCore::operator/(WebCore::LayoutUnit const&, WebCore::LayoutUnit const&) (Safari_ASAN_258820_08056b77ac1d7bd944690afb1f182d3dda421853.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x2a477bd) #1 0x121505658 in WebCore::RenderBlockFlow::computeColumnCountAndWidth() (Safari_ASAN_258820_08056b77ac1d7bd944690afb1f182d3dda421853.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x4b23658) #2 0x12150513b in WebCore::RenderBlockFlow::recomputeLogicalWidthAndColumnWidth() (Safari_ASAN_258820_08056b77ac1d7bd944690afb1f182d3dda421853.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x4b2313b) #3 0x121506349 in WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit) (Safari_ASAN_258820_08056b77ac1d7bd944690afb1f182d3dda421853.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x4b24349) #4 0x1214ccc74 in WebCore::RenderBlock::layout() (Safari_ASAN_258820_08056b77ac1d7bd944690afb1f182d3dda421853.app/Contents/Frameworks/WebCore.framework/Versions/A/WebCore:x86_64+0x4aeac74) 1633405 1 shihchieh_lee 2020-03-24 11:51:59 -0700 Root cause: In function computeColumnCountAndWidth, the computed colGap is -1 px, and colWidth is 1px. And next (colWidth + colGap) is used as denominator to get desiredColumnCount, resulting in division by zero. All the pixel settings seem normal, but function contentWidth() gives a negative value. contentWidth = paddingBoxWidth - paddingLeft - paddingRight where paddingBoxWidth=0, paddingLeft=0, paddingRight=64 And paddingBoxWidth = std::max(0_lu, width() - borderLeft() - borderRight() - verticalScrollbarWidth()); where width=192, borderLeft=64, borderRight=64, verticalScrollbarWidth=15 1633406 2 shihchieh_lee 2020-03-24 11:52:41 -0700 Division by zero so should not have security implications. 1633423 3 394395 shihchieh_lee 2020-03-24 12:29:03 -0700 Created attachment 394395 Patch 1633478 4 394408 shihchieh_lee 2020-03-24 14:13:58 -0700 Created attachment 394408 Patch 1633483 5 shihchieh_lee 2020-03-24 14:20:35 -0700 Limit the minimum to 0 in function contentWidth() and contentHeight() breaks expected result of some tests. (In reply to Jack from comment #3) > Created attachment 394395 [details] > Patch 1633489 6 shihchieh_lee 2020-03-24 14:24:42 -0700 Limit the minimum of column gap instead. However, this patch would still show error message below when the grid-gap is set to 50%. There is no error when grid-gap is 100%. ERROR: !(m_value >= 0) /Users/jacklee/browser2/OpenSource/Source/WebCore/platform/LayoutUnit.h(114) : unsigned int WebCore::LayoutUnit::toUnsigned() const <style> #TEXTAREA { grid-gap: 50%; -webkit-logical-width: 0px; } </style> <script> window.onload = () => { TEXTAREA.style.setProperty("column-width", "1px"); TEXTAREA.style.setProperty("padding", "0px 1px 0px 0px"); } </script> <body><textarea id=TEXTAREA><span></span></textarea> (In reply to Jack from comment #4) > Created attachment 394408 [details] > Patch 1634380 7 zalan 2020-03-26 09:35:14 -0700 the first patch looks correct, you should check the nature of the different geometry and why we end up producing it (it might just be correct). 1634422 8 shihchieh_lee 2020-03-26 10:48:48 -0700 Alan, thanks! But a lot of tests fail in first patch. I guess the content width/height were negative in those tests. (In reply to zalan from comment #7) > the first patch looks correct, you should check the nature of the different > geometry and why we end up producing it (it might just be correct). 1634835 9 zalan 2020-03-27 09:35:17 -0700 (In reply to Jack from comment #8) > Alan, thanks! But a lot of tests fail in first patch. I guess the content > width/height were negative in those tests. I see only one failure. https://ews-build.webkit.org/results/macOS-Mojave-Release-WK1-Tests-EWS/r394395-5787/results.html Am I missing something here? 1634873 10 shihchieh_lee 2020-03-27 10:50:36 -0700 Thanks for checking out the patch. There is one crash and one failed case in Mac-wk1, two failures in Mac-wk2 and one failure in ios-wk2 and mac-debug-wk1 when I obsolete the change. Most of them show different pixel sizes (almost for every element), so I think the test cases probably expect negative content width/height. :-( layer at (0,0) size 800x251 RenderBlock {HTML} at (0,0) size 800x251 RenderBody {BODY} at (8,8) size 784x235 layer at (0,0) size 800x249 RenderBlock {HTML} at (0,0) size 800x249 RenderBody {BODY} at (8,8) size 784x233 (In reply to zalan from comment #9) > (In reply to Jack from comment #8) > > Alan, thanks! But a lot of tests fail in first patch. I guess the content > > width/height were negative in those tests. > I see only one failure. > https://ews-build.webkit.org/results/macOS-Mojave-Release-WK1-Tests-EWS/ > r394395-5787/results.html > Am I missing something here? 1634879 11 zalan 2020-03-27 10:56:19 -0700 (In reply to Jack from comment #10) > Thanks for checking out the patch. There is one crash and one failed case in > Mac-wk1, two failures in Mac-wk2 and one failure in ios-wk2 and > mac-debug-wk1 when I obsolete the change. I am so confused. Are we looking at the same test output? e.g. I don't see a crash at all. Could you include a link to these failures? 1634884 12 zalan 2020-03-27 11:03:47 -0700 (In reply to zalan from comment #11) > (In reply to Jack from comment #10) > > Thanks for checking out the patch. There is one crash and one failed case in > > Mac-wk1, two failures in Mac-wk2 and one failure in ios-wk2 and > > mac-debug-wk1 when I obsolete the change. > I am so confused. Are we looking at the same test output? e.g. I don't see a > crash at all. Could you include a link to these failures? I guess you meant "open-after-abort.htm". that must be unrelated. please check locally. 1634898 13 shihchieh_lee 2020-03-27 11:16:38 -0700 I see. Thanks! Other links are attached below. There are five cases failing, but button.html fail on three MAC platforms. Maybe the width/height is negative only on MAC? And I am not sure if the other two are related to the code change. I will run the test to verify. css3/flexbox/button.html fast/hidpi/image-srcset-relative-svg-canvas-2x.html imported/w3c/web-platform-tests/content-security-policy/reporting/report-uri-from-child-frame.html https://ews-build.webkit.org/results/iOS-13-Simulator-WK2-Tests-EWS/r394395-13750/results.html https://ews-build.webkit.org/results/macOS-Mojave-Release-WK1-Tests-EWS/r394395-5787/results.html https://ews-build.webkit.org/results/macOS-Mojave-Release-WK2-Tests-EWS/r394395-5865/results.html https://ews-build.webkit.org/results/macOS-Mojave-Debug-WK1-Tests-EWS/r394395-5855/results.html (In reply to zalan from comment #12) > I guess you meant "open-after-abort.htm". that must be unrelated. please > check locally. 1634904 14 zalan 2020-03-27 11:23:15 -0700 (In reply to Jack from comment #13) > I see. Thanks! Other links are attached below. There are five cases failing, > but button.html fail on three MAC platforms. Maybe the width/height is > negative only on MAC? And I am not sure if the other two are related to the > code change. I will run the test to verify. > > fast/hidpi/image-srcset-relative-svg-canvas-2x.html This is most likely unrelated. If you look at the diff, you can see that this is a circle drawing mismatch. > imported/w3c/web-platform-tests/content-security-policy/reporting/report-uri- > from-child-frame.html There's no diff to it's hard to tell but I'd be very surprised if it was caused by this change. > css3/flexbox/button.html I think this is the only failure caused by this change. 1634906 15 shihchieh_lee 2020-03-27 11:25:41 -0700 Thanks! Got it. I will submit the first patch and rerun the test. Hopefully the other two will disappear this time. But are they flaky cases? Since they don't fail in the second patch somehow. (In reply to zalan from comment #14) > (In reply to Jack from comment #13) > > I see. Thanks! Other links are attached below. There are five cases failing, > > but button.html fail on three MAC platforms. Maybe the width/height is > > negative only on MAC? And I am not sure if the other two are related to the > > code change. I will run the test to verify. > > > > fast/hidpi/image-srcset-relative-svg-canvas-2x.html > This is most likely unrelated. If you look at the diff, you can see that > this is a circle drawing mismatch. > > > > imported/w3c/web-platform-tests/content-security-policy/reporting/report-uri- > > from-child-frame.html > There's no diff to it's hard to tell but I'd be very surprised if it was > caused by this change. > > > css3/flexbox/button.html > I think this is the only failure caused by this change. 1634947 16 394745 shihchieh_lee 2020-03-27 12:16:38 -0700 Created attachment 394745 Patch 1634949 17 shihchieh_lee 2020-03-27 12:19:54 -0700 Thanks Alan for discussion. We are going to limit minimal value of content width and height to 0, since there is no concept of negative content size. Run with modified expected output for button.html (only for MAC platform). (In reply to Jack from comment #16) > Created attachment 394745 [details] > Patch 1635588 18 ews-feeder 2020-03-30 10:43:28 -0700 Committed r259210: <https://trac.webkit.org/changeset/259210> All reviewed patches have been landed. Closing bug and clearing flags on attachment 394745. 1635610 19 rniwa 2020-03-30 11:24:39 -0700 There is no security implication here. 394395 2020-03-24 12:29:03 -0700 2020-03-24 14:13:54 -0700 Patch bug-209485-20200324122902.patch text/plain 4106 shihchieh_lee U3VidmVyc2lvbiBSZXZpc2lvbjogMjU4ODkwCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggOTE5ZmJjOTMyM2JmOTVj NzAxNzBmZmZmODdkNTU1MjNjOGU0YjIwYS4uMjUyOGMyZTdmM2Q4OTg1Zjg4NDZhNTQzNTZlMzAy Mzk3NTZkZGNhYiAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDE5IEBACisyMDIwLTAzLTI0ICBKYWNr IExlZSAgPHNoaWhjaGllaF9sZWVAYXBwbGUuY29tPgorCisgICAgICAgIERpdmlzaW9uIGJ5IHpl cm8gaW4gUmVuZGVyQmxvY2tGbG93Ojpjb21wdXRlQ29sdW1uQ291bnRBbmRXaWR0aAorICAgICAg ICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MjA5NDg1CisgICAgICAg IDxyZGFyOi8vcHJvYmxlbS82MDc0NjEwOT4KKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkg 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