Comment 4 for bug 1934414
Revision history for this message
| Thadeu Lima de Souza Cascardo (cascardo) wrote Re: test_bpf.sh from ubuntu_kernel_selftests.net from linux ADT test failure with linux/4.15.0-149.153 | #4 |
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.