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bpf: Add the missing BPF_LINK_TYPE invocation for sockmap

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There is an out-of-bounds read in bpf_link_show_fdinfo() for the sockmap
link fd. Fix it by adding the missing BPF_LINK_TYPE invocation for
sockmap link

Also add comments for bpf_link_type to prevent missing updates in the
future.

Fixes: 699c23f02c65 ("bpf: Add bpf_link support for sk_msg and sk_skb progs")
Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20241024013558.1135167-2-houtao@huaweicloud.com
This commit is contained in:
Hou Tao 2024-10-24 09:35:57 +08:00 committed by Andrii Nakryiko
parent 9806f28314
commit c2f803052b
3 changed files with 7 additions and 0 deletions
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1
include/linux/bpf_types.h
View File

@ -146,6 +146,7 @@ BPF_LINK_TYPE(BPF_LINK_TYPE_XDP, xdp)
BPF_LINK_TYPE(BPF_LINK_TYPE_NETFILTER, netfilter)
BPF_LINK_TYPE(BPF_LINK_TYPE_TCX, tcx)
BPF_LINK_TYPE(BPF_LINK_TYPE_NETKIT, netkit)
BPF_LINK_TYPE(BPF_LINK_TYPE_SOCKMAP, sockmap)
#endif
#ifdef CONFIG_PERF_EVENTS
BPF_LINK_TYPE(BPF_LINK_TYPE_PERF_EVENT, perf)

3
include/uapi/linux/bpf.h
View File

@ -1121,6 +1121,9 @@ enum bpf_attach_type {
#define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE
/* Add BPF_LINK_TYPE(type, name) in bpf_types.h to keep bpf_link_type_strs[]
* in sync with the definitions below.
*/
enum bpf_link_type {
BPF_LINK_TYPE_UNSPEC = 0,
BPF_LINK_TYPE_RAW_TRACEPOINT = 1,

3
tools/include/uapi/linux/bpf.h
View File

@ -1121,6 +1121,9 @@ enum bpf_attach_type {
#define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE
/* Add BPF_LINK_TYPE(type, name) in bpf_types.h to keep bpf_link_type_strs[]
* in sync with the definitions below.
*/
enum bpf_link_type {
BPF_LINK_TYPE_UNSPEC = 0,
BPF_LINK_TYPE_RAW_TRACEPOINT = 1,