So, test_bpf is not doing either conversion and any other use on the kernel should either be using something like sk_attach*, bpf_prog_create*, or just using a fd that was created from BPF_PROG_LOAD. Any user that accepts BPF programs without those checks are up to cause issues worse than a simple div-by-zero.
So far, I could not find any such user by code inspection. I also tested that a SO_ATTACH_FILTER (classic BPF) that does a div-by- zero behaves the same way on 4.15.0-145, 4.15.0-147 and 4.15.0-149, that is, the program will have an "exception", which means it returns 0. With sockets, this means the packet is dropped. That is expected behavior. Marking this bug priority as low as a result. Cascardo. ** Changed in: linux (Ubuntu Bionic) Importance: Undecided => Low -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1934414 Title: test_bpf.sh from ubuntu_kernel_selftests.net from linux ADT test failure with linux/4.15.0-149.153 Status in linux package in Ubuntu: Invalid Status in linux source package in Bionic: In Progress Bug description: This is a scripted bug report about ADT failures while running linux tests for linux/4.15.0-149.153 on bionic. Whether this is caused by the dep8 tests of the tested source or the kernel has yet to be determined. Testing failed on: i386: https://autopkgtest.ubuntu.com/results/autopkgtest-bionic/bionic/i386/l/linux/20210702_010055_445cd@/log.gz 03:37:02 DEBUG| [stdout] selftests: test_bpf.sh 03:37:02 DEBUG| [stdout] ======================================== 03:37:03 ERROR| [stderr] Segmentation fault 03:37:03 DEBUG| [stdout] test_bpf: [FAIL] 03:37:03 DEBUG| [stdout] not ok 1..8 selftests: test_bpf.sh [FAIL] 03:37:03 DEBUG| [stdout] selftests: netdevice.sh 03:37:03 DEBUG| [stdout] ======================================== To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1934414/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
