bpf: Allow all printable characters in BTF DATASEC names

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The intent is to allow libbpf to use SEC("?.struct_ops") to identify
struct_ops maps that are optional, e.g. like in the following BPF code:

    SEC("?.struct_ops")
    struct test_ops optional_map = { ... };

Which yields the following BTF:

    ...
    [13] DATASEC '?.struct_ops' size=0 vlen=...
    ...

To load such BTF libbpf rewrites DATASEC name before load.
After this patch the rewrite won't be necessary.

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20240306104529.6453-15-eddyz87@gmail.com

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Eduard Zingerman 2024-03-06 12:45:28 +02:00 • committed by Andrii Nakryiko

parent 733e5e8754

commit bd70a8fb7c

1 changed files with 15 additions and 1 deletions

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kernel/bpf/btf.c

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