+++ This bug was initially created as a clone of Bug #1595191 +++ We should backport the following upstream commits, to fix a bypass and to improve compatibility: commit 4e8a6346cd3da2d88bbad745a1769260d36f2783 Author: Florian Weimer <fweimer> Date: Fri Jun 1 10:41:03 2018 +0200 libio: Avoid _allocate_buffer, _free_buffer function pointers [BZ #23236] commit 2d1c89a5d7c872a1109768f50e2508cf9a4b0348 Author: Florian Weimer <fweimer> Date: Wed Jun 20 09:45:19 2018 +0200 libio: Avoid ptrdiff_t overflow in IO_validate_vtable commit c402355dfa7807b8e0adb27c009135a7e2b9f1b0 Author: Florian Weimer <fweimer> Date: Tue Jun 26 10:24:52 2018 +0200 libio: Disable vtable validation in case of interposition [BZ #23313] And backport the new test: commit c402355dfa7807b8e0adb27c009135a7e2b9f1b0 Author: Florian Weimer <fweimer> Date: Tue Jun 26 10:24:52 2018 +0200 libio: Disable vtable validation in case of interposition [BZ #23313] commit 29055464a03c72762969a2e8734d0d05d4d70e58 Author: Florian Weimer <fweimer> Date: Tue Jun 26 12:20:44 2018 +0200 libio: Add tst-vtables, tst-vtables-interposed
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