On Thu, Oct 29, 2020 at 1:16 PM Florian Lehner <dev@xxxxxxxxxxx> wrote: > > Currently key_size of hashtab is limited to MAX_BPF_STACK. > As the key of hashtab can also be a value from a per cpu map it can be > larger than MAX_BPF_STACK. > > The use-case for this patch originates to implement allow/disallow > lists for files and file paths. The maximum length of file paths is > defined by PATH_MAX with 4096 chars including nul. > This limit exceeds MAX_BPF_STACK. > > Changelog: > > v5: > - Fix cast overflow > > v4: > - Utilize BPF skeleton in tests > - Rebase > > v3: > - Rebase > > v2: > - Add a test for bpf side > > Signed-off-by: Florian Lehner <dev@xxxxxxxxxxx> > Acked-by: John Fastabend <john.fastabend@xxxxxxxxx> > --- LGTM. Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx> > kernel/bpf/hashtab.c | 16 +++---- > .../selftests/bpf/prog_tests/hash_large_key.c | 43 ++++++++++++++++++ > .../selftests/bpf/progs/test_hash_large_key.c | 44 +++++++++++++++++++ > tools/testing/selftests/bpf/test_maps.c | 3 +- > 4 files changed, 94 insertions(+), 12 deletions(-) > create mode 100644 tools/testing/selftests/bpf/prog_tests/hash_large_key.c > create mode 100644 tools/testing/selftests/bpf/progs/test_hash_large_key.c > [...]
