Adding support to call bpf_get_attach_cookie helper from kprobe programs attached with kprobe multi link. The cookie is provided by array of u64 values, where each value is paired with provided function address or symbol with the same array index. When cookie array is provided it's sorted together with addresses (check bpf_kprobe_multi_cookie_swap). This way we can find cookie based on the address in bpf_get_attach_cookie helper.
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| @@ -1487,6 +1487,7 @@ union bpf_attr { · 1486 unmodified lines | ||
| 1487 | 1487 | __u32 cnt; |
| 1488 | 1488 | __aligned_u64 syms; |
| 1489 | 1489 | __aligned_u64 addrs; |
| 1490 | + __aligned_u64 cookies; | |
| 1490 | 1491 | } kprobe_multi; |
| 1491 | 1492 | }; |
| 1492 | 1493 | } link_create; |