path: root/samples
diff options
authorYonghong Song <yhs@fb.com>2020-05-13 11:02:21 -0700
committerAlexei Starovoitov <ast@kernel.org>2020-05-13 12:30:50 -0700
commit3c32cc1bceba8a1755dc35cd97516f6c67856844 (patch)
tree10e978c4bc1374703070d8ecee9e4e007b13183b /samples
parentbpf: Change func bpf_iter_unreg_target() signature (diff)
bpf: Enable bpf_iter targets registering ctx argument types
Commit b121b341e598 ("bpf: Add PTR_TO_BTF_ID_OR_NULL support") adds a field btf_id_or_null_non0_off to bpf_prog->aux structure to indicate that the first ctx argument is PTR_TO_BTF_ID reg_type and all others are PTR_TO_BTF_ID_OR_NULL. This approach does not really scale if we have other different reg types in the future, e.g., a pointer to a buffer. This patch enables bpf_iter targets registering ctx argument reg types which may be different from the default one. For example, for pointers to structures, the default reg_type is PTR_TO_BTF_ID for tracing program. The target can register a particular pointer type as PTR_TO_BTF_ID_OR_NULL which can be used by the verifier to enforce accesses. Signed-off-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/20200513180221.2949882-1-yhs@fb.com
Diffstat (limited to 'samples')
0 files changed, 0 insertions, 0 deletions