feat: read full program name from function info #1889
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dylandreimerink
requested changes
Nov 5, 2025
As described in the comment, querying both xlated_prog_insns and other fields can cause some information to be missing. Make a separate syscall for this field to avoid missing information. Signed-off-by: Max Altgelt <[email protected]>
Analogous to bpftool's get_prog_full_name function, query a program's full name (if possible) from the BTF info. Signed-off-by: Max Altgelt <[email protected]>
Signed-off-by: Max Altgelt <[email protected]>
dylandreimerink
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Nov 10, 2025
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This looks good to me, thank you!
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While the program name in the kernel is limited to 16 bytes (including a terminating zero byte), the BTF information may contain the full name.
bpftool uses this information to extract the full program name, if possible, see https://github.com/libbpf/bpftool/blob/b799c6f513400009d56cfc11b8e3a8fcbd2b7c14/src/common.c#L413
Adapt this logic to do the same.
This also exposed a bug where some information was missing due to strange (arguably buggy) kernel behaviour. Add a workaround for this as well.