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author | Yonghong Song <yhs@fb.com> | 2020-05-13 21:02:21 +0300 |
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committer | Alexei Starovoitov <ast@kernel.org> | 2020-05-13 22:30:50 +0300 |
commit | 3c32cc1bceba8a1755dc35cd97516f6c67856844 (patch) | |
tree | 10e978c4bc1374703070d8ecee9e4e007b13183b /drivers/clocksource | |
parent | ab2ee4fcb9d61fd57db70db694adbcf54662bd80 (diff) | |
download | linux-3c32cc1bceba8a1755dc35cd97516f6c67856844.tar.xz |
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 'drivers/clocksource')
0 files changed, 0 insertions, 0 deletions