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bpf: Add BPF token support to BPF_BTF_LOAD command

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Accept BPF token FD in BPF_BTF_LOAD command to allow BTF data loading
through delegated BPF token. BPF_F_TOKEN_FD flag has to be specified
when passing BPF token FD. Given BPF_BTF_LOAD command didn't have flags
field before, we also add btf_flags field.

BTF loading is a pretty straightforward operation, so as long as BPF
token is created with allow_cmds granting BPF_BTF_LOAD command, kernel
proceeds to parsing BTF data and creating BTF object.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20240124022127.2379740-6-andrii@kernel.org
This commit is contained in:
Andrii Nakryiko
2024-01-23 18:21:02 -08:00
committed by Andrii Nakryiko
parent 1386c15b7b
commit eb9d10835c
1 changed files with 5 additions and 0 deletions
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5
include/uapi/linux/bpf.h
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@@ -1632,6 +1632,11 @@ union bpf_attr {
* truncated), or smaller (if log buffer wasn't filled completely).
*/
__u32 btf_log_true_size;
__u32 btf_flags;
/* BPF token FD to use with BPF_BTF_LOAD operation.
* If provided, btf_flags should have BPF_F_TOKEN_FD flag set.
*/
__s32 btf_token_fd;
};
struct {