bpf_binprm_set_interp_arg(9)

💅 bpf_binprm_set_interp_arg(9) — like, the Kernel API Manual page, bestie

okay so picture this: you're deep in Kernel API Manual territory, section 9, and you've got this one little function that just... sets a single argument for the interpreter. that's it. that's the whole vibe. and honestly? it ate. 🎀

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✨ NAME ✨

bpf_binprm_set_interp_arg — set a single argument for the interpreter. one (1) argument. singular. main character energy, no entourage. 👑

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🦋 SYNOPSIS 🦋

__bpf_kfunc int bpf_binprm_set_interp_arg (struct linux_binprm *bprm ,
const char *arg , size_t arg__sz );

yes bestie that's the whole signature, copy it exactly, don't be weird about it. ✨

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🌸 ARGUMENTS 🌸

• bprm — the binary that is being executed. it's the whole reason we're here, lowkey the protagonist. 🫶
• arg — the argument you're passing to the interpreter. this is the little gift you're handing over. 💖
• arg__sz — the size of the arg buffer, including the terminating NUL. not "kinda including" it — including it. that NUL is part of the count, fr fr. 😭

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💜 DESCRIPTION 💜

okay so here's the tea. 🍓

This is meant to be called from the load program of a struct binfmt_misc_ops handler. that's the whole context, that's where you live now.

The argument gets passed to the interpreter ahead of the binary — which is literally mirroring the single optional argument of a #! interpreter line. iykyk. 🌈

And the fun part: calling it again replaces the argument. not appends. not stacks. replaces. so if you call it twice, the second one wins and the first one is just... gone. sorry to that argument. 💀

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🔥 RETURN 🔥

• 0 on success — slay, it worked. 🎉
• a negative errno on failure — not slay, something went sideways, check your errno. 🙈

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⭐ SEE ALSO ⭐

go touch some other pages, bestie:

• Kernel file ./fs/binfmt_misc_bpf.c — the source, go read it, it's giving homework but make it fun 📚
• binfmt_misc_get_ops(9)
• bpf_binprm_set_interp(9)
• bpf_binprm_select_interp(9)
• bpf_binprm_set_flags(9)

these are the siblings, the friend group, the whole squad. 🧚

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ngl this page is from ./fs, dated October 2026 — so like, future vibes. write that down. ✨

okay bye bestie, go set exactly one interpreter argument and make it iconic. 💅🎀💖