234724 2021-12-28 06:55:22 -0800 SharedBuffer::takeData() is still dangerous 2021-12-30 19:21:20 -0800 1 1 1 Unclassified WebKit WebCore Misc. Other Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=228161 InRadar P2 Normal --- 232424 1 jean-yves.avenard jean-yves.avenard darin webkit-bug-importer oldest_to_newest 1827074 0 jean-yves.avenard 2021-12-28 06:55:22 -0800 This issue was first addressed in bug 228161 What this change did was to ensure that there was only one reference to the SharedBuffer before taking the data's vector otherwise would return a copy instead. But this isn't a sufficient condition to ensure that the DataSegment itself isn't shared. The same DataSegment can be shared across multiple SharedBuffers Consider the following code: auto buffer = SharedBuffer::create("my_data", 7); auto copy = buffer->copy(); auto innerData = copy->extractData(); now the original SharedBuffer `buffer` is empty (but still has a size of 7) as SharedBuffer::copy() will only do a shallow copy of the SharedBuffer. This is what caused the remaining errors in bug 232424. 1827075 1 webkit-bug-importer 2021-12-28 06:55:56 -0800 <rdar://problem/86957233> 1827137 2 448059 jean-yves.avenard 2021-12-28 16:20:33 -0800 Created attachment 448059 Patch 1827287 3 ews-feeder 2021-12-30 19:21:19 -0800 Committed r287489 (245624@main): <https://commits.webkit.org/245624@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 448059. 448059 2021-12-28 16:20:33 -0800 2021-12-30 19:21:19 -0800 Patch bug-234724-20211229112026.patch text/plain 4204 jean-yves.avenard U3VidmVyc2lvbiBSZXZpc2lvbjogMjg3NDU5CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggNTAxMzVkOTZlMzc3YmE4 NzE4NWM4MmQ0OWNkOTA0OWZmYTExMTA3Mi4uMjM5YmQwOWIyOTM0NTRmYjhhNTE0NWY4ZDQwMzNh MzhjMmVmNDY4YiAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDI1IEBACisyMDIxLTEyLTI4ICBKZWFu LVl2ZXMgQXZlbmFyZCAgPGp5YUBhcHBsZS5jb20+CisKKyAgICAgICAgU2hhcmVkQnVmZmVyOjp0 YWtlRGF0YSgpIGlzIHN0aWxsIGRhbmdlcm91cworICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0 Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9MjM0NzI0CisgICAgICAgIHJkYXI6Ly9wcm9ibGVtLzg2OTU3 MjMzCisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAgU2lt aWxhciB0byBidWcgMjI4MTYxOyBob3dldmVyIHdlIG9ubHkgdGFrZSB0aGUgY29udGVudCBvZiB0 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