On 05/02/2017 02:31 PM, Jesper Dangaard Brouer wrote:
This series improves and fixes bpf ELF loader and programs under samples/bpf. The bpf_load.c created some hard to debug issues when the struct (bpf_map_def) used in the ELF maps section format changed in commit fb30d4b71214 ("bpf: Add tests for map-in-map").This was hotfixed in commit 409526bea3c3 ("samples/bpf: bpf_load.c detect and abort if ELF maps section size is wrong") by detecting the issue and aborting the program. In most situations the bpf-loader should be able to handle these kind of changes to the struct size. This patch series aim to do proper backward and forward compabilility handling when loading ELF files. This series also adjust the callback that was introduced in commit 9fd63d05f3e8 ("bpf: Allow bpf sample programs (*_user.c) to change bpf_map_def") to use the new bpf_map_data structure, before more users start to use this callback. Hoping these changes can make the merge window, as above mentioned commits have not been merged yet, and it would be good to avoid users hitting these issues.
Overall, set looks good to me. The last patch doesn't have a user yet, so probably better to drop it until there is an actual user in the tree. Long term, I'd like to see the samples being migrated to use the tools/lib/bpf/ library from the tree, so that we can avoid duplicating effort with having two libs in the tree (f.e. elf map validation is performed to a certain degree in the other one, but w/o compat support last time I looked). Anyway, other than that: Acked-by: Daniel Borkmann <dan...@iogearbox.net>
