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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 /net/netlink
parentab2ee4fcb9d61fd57db70db694adbcf54662bd80 (diff)
downloadlinux-3c32cc1bceba8a1755dc35cd97516f6c67856844.tar.bz2
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 'net/netlink')
-rw-r--r--net/netlink/af_netlink.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 839827227e98..4f2c3b14ddbf 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -2809,6 +2809,11 @@ static const struct bpf_iter_reg netlink_reg_info = {
.init_seq_private = bpf_iter_init_seq_net,
.fini_seq_private = bpf_iter_fini_seq_net,
.seq_priv_size = sizeof(struct nl_seq_iter),
+ .ctx_arg_info_size = 1,
+ .ctx_arg_info = {
+ { offsetof(struct bpf_iter__netlink, sk),
+ PTR_TO_BTF_ID_OR_NULL },
+ },
};
static int __init bpf_iter_register(void)