39704 2010-05-25 17:54:00 -0700 readPixels with negative width/height should generate INVALID_VALUE and return 2010-06-11 08:03:52 -0700 1 1 1 Unclassified WebKit WebGL 528+ (Nightly build) PC OS X 10.5 RESOLVED FIXED P2 Normal --- 1 zmo zmo cmarrin commit-queue kbr levin oliver oldest_to_newest 230541 0 zmo 2010-05-25 17:54:00 -0700 Currently readPixels will crash if width/height are negative. Instead, INVALID_VALUE should be generated. 230543 1 zmo 2010-05-25 17:58:27 -0700 Also, with very large width/height and WebGL*Array creation failure, a INVALID_VALUE error will generate. 230556 2 57063 zmo 2010-05-25 19:20:04 -0700 Created attachment 57063 patch 230887 3 levin 2010-05-26 14:15:37 -0700 What bug is this new line fixing? 1707 memset(data, 0, totalBytes); And does the layout test cover that? (If not, can it be added?) 230905 4 zmo 2010-05-26 14:34:56 -0700 (In reply to comment #3) > What bug is this new line fixing? > > 1707 memset(data, 0, totalBytes); > > And does the layout test cover that? (If not, can it be added?) This is not a bug fix. For safety reason, we clear the buffer so users will not get access to content they should not. According to GLES spec, for the un-covered portion of the memory, their content is un-defined. I don't think we should write a definitive test against something undefined, because whatever the content is, it should not be "incorrect". 230917 5 levin 2010-05-26 14:40:14 -0700 (In reply to comment #4) > (In reply to comment #3) > > What bug is this new line fixing? > > > > 1707 memset(data, 0, totalBytes); > > > > And does the layout test cover that? (If not, can it be added?) > > This is not a bug fix. For safety reason, we clear the buffer so users will not get access to content they should not. According to GLES spec, for the un-covered portion of the memory, their content is un-defined. I don't think we should write a definitive test against something undefined, because whatever the content is, it should not be "incorrect". Should it be set to something (like -10 for example) that is less likely to make users rely on undefined behavior? 0 tends to make things just work (that maybe shouldn't) and thus hide problems. 230918 6 oliver 2010-05-26 14:41:19 -0700 (In reply to comment #4) > (In reply to comment #3) > > What bug is this new line fixing? > > > > 1707 memset(data, 0, totalBytes); > > > > And does the layout test cover that? (If not, can it be added?) > > This is not a bug fix. For safety reason, we clear the buffer so users will not get access to content they should not. According to GLES spec, for the un-covered portion of the memory, their content is un-defined. I don't think we should write a definitive test against something undefined, because whatever the content is, it should not be "incorrect". There should be a test, otherwise there's nothing to verify that the data is safe -- if some other implementation decides to produces something other than a zero-filled buffer they can add platform specific expected results. 230934 7 zmo 2010-05-26 14:51:15 -0700 (In reply to comment #5) > (In reply to comment #4) > > (In reply to comment #3) > > > What bug is this new line fixing? > > > > > > 1707 memset(data, 0, totalBytes); > > > > > > And does the layout test cover that? (If not, can it be added?) > > > > This is not a bug fix. For safety reason, we clear the buffer so users will not get access to content they should not. According to GLES spec, for the un-covered portion of the memory, their content is un-defined. I don't think we should write a definitive test against something undefined, because whatever the content is, it should not be "incorrect". > > Should it be set to something (like -10 for example) that is less likely to make users rely on undefined behavior? > > 0 tends to make things just work (that maybe shouldn't) and thus hide problems. Good point. I'll double check WebGL spec, if it doesn't have extra constraints about buffers initialized to 0, I'll use an odd number instead. 230935 8 zmo 2010-05-26 14:51:57 -0700 (In reply to comment #6) > (In reply to comment #4) > > (In reply to comment #3) > > > What bug is this new line fixing? > > > > > > 1707 memset(data, 0, totalBytes); > > > > > > And does the layout test cover that? (If not, can it be added?) > > > > This is not a bug fix. For safety reason, we clear the buffer so users will not get access to content they should not. According to GLES spec, for the un-covered portion of the memory, their content is un-defined. I don't think we should write a definitive test against something undefined, because whatever the content is, it should not be "incorrect". > > > There should be a test, otherwise there's nothing to verify that the data is safe -- if some other implementation decides to produces something other than a zero-filled buffer they can add platform specific expected results. Ok, will add a case then. 230951 9 zmo 2010-05-26 15:07:44 -0700 ReadPixels signature will change. This patch becomes invalid. 236562 10 zmo 2010-06-10 15:24:25 -0700 Due to https://bugs.webkit.org/show_bug.cgi?id=40322, negative width/height will no longer cause crash, but still, we need to deal with it correctly, i.e., generate INVALID_VALUE and return. 236563 11 58418 zmo 2010-06-10 15:28:01 -0700 Created attachment 58418 patch 236599 12 58418 kbr 2010-06-10 17:30:58 -0700 Comment on attachment 58418 patch WebCore/html/canvas/WebGLRenderingContext.cpp:1673 + } Let's put this check right after the NULL check for the "pixels" argument tomorrow to try to follow the request for prioritization of error returns from Mozilla: https://www.khronos.org/webgl/public-mailing-list/archives/1006/msg00040.html LayoutTests/fast/canvas/webgl/read-pixels.html:184 + return; Should presumably say: } else if (!array.length) { shouldBe("gl.getError()", "gl.NO_ERROR"); return; } 236608 13 58426 zmo 2010-06-10 17:50:57 -0700 Created attachment 58426 revised patch: responding to kbr's review 236611 14 58426 kbr 2010-06-10 17:55:24 -0700 Comment on attachment 58426 revised patch: responding to kbr's review Looks good. 236671 15 58426 dglazkov 2010-06-10 21:34:21 -0700 Comment on attachment 58426 revised patch: responding to kbr's review Make it so. 236827 16 58426 commit-queue 2010-06-11 08:03:46 -0700 Comment on attachment 58426 revised patch: responding to kbr's review Clearing flags on attachment: 58426 Committed r61019: <http://trac.webkit.org/changeset/61019> 236828 17 commit-queue 2010-06-11 08:03:52 -0700 All reviewed patches have been landed. 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