linux/net/netlink
Yonghong Song 3c32cc1bce bpf: Enable bpf_iter targets registering ctx argument types
Commit b121b341e5 ("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
2020-05-13 12:30:50 -07:00
..
af_netlink.c bpf: Enable bpf_iter targets registering ctx argument types 2020-05-13 12:30:50 -07:00
af_netlink.h netlink: Add new socket option to enable strict checking on dumps 2018-10-08 10:39:04 -07:00
diag.c treewide: Add SPDX license identifier for more missed files 2019-05-21 10:50:45 +02:00
genetlink.c netlink: add infrastructure to expose policies to userspace 2020-04-30 17:51:42 -07:00
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile netlink: add infrastructure to expose policies to userspace 2020-04-30 17:51:42 -07:00
policy.c netlink: add infrastructure to expose policies to userspace 2020-04-30 17:51:42 -07:00