ENUM BPF_BINPRM_FLAGS(9)

💅 enum bpf_binprm_flags(9) 💅

okay so bestie, welcome to the Kernel API Manual — this is the page for enum bpf_binprm_flags, and honestly? it's giving "tiny enum, huge responsibilities". stay with me, it's cute.

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✨ NAME ✨

enum bpf_binprm_flags — the per-exec invocation flags that a load program can request 🎀

like, per. exec. every single time. not once at registration. we'll get there.

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✨ SYNOPSIS ✨

enum bpf_binprm_flags {
    BPF_BINPRM_PRESERVE_ARGV0 ,
    BPF_BINPRM_CREDENTIALS ,
    BPF_BINPRM_EXECFD ,
    BPF_BINPRM_TRANSPARENT ,
    BPF_BINPRM_LOADER

};

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✨ OPTIONS ✨

🌸 Constants

• BPF_BINPRM_PRESERVE_ARGV0 — keeps the caller's argv[0] around, no take-backsies. this one's the 'P' flag energy 💖
• BPF_BINPRM_CREDENTIALS — computes the credentials from the binary. lowkey implies execfd. it's the 'C' flag 🔥
• BPF_BINPRM_EXECFD — passes the binary over via AT_EXECFD. classic 'O' flag behaviour 🫶
• BPF_BINPRM_TRANSPARENT — leaves argv completely untouched, and the interpreter pulls the binary from AT_EXECFD. this is the 'T' flag. heads up: it implies execfd and it excludes preserve-argv0 — they are not friends, do not put them in the same group chat 😭
• BPF_BINPRM_LOADER — swaps the interpreter in for the binary's PT_INTERP and runs the binary as a native exec. that's the 'L' flag, and it's kind of a main character because it excludes every other flag. periodt 👑

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✨ Description ✨

so these get set from a load program with bpf_binprm_set_flags. that's the whole vibe.

and here's the part that slaps: unlike a static entry — which picks its thing once at registration and then just lives like that forever — a bpf handler chooses these per exec rather than once at registration. every exec gets a fresh vibe check 💅✨

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✨ SEE ALSO ✨

• Kernel file ./include/linux/binfmt_misc.h — struct binfmt_misc_interp(9), struct binfmt_misc_ops(9) 🦋

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that's the page, bestie! this icon was brought to you by the source in ./include/linux, dated October 2026, straight out of the Kernel API Manual — go forth and flag responsibly 🎀💜🌟