STRUCT LANDLOCK_PATH_BENEATH_ATTR(9)

💅 struct landlock_path_beneath_attr(9) — the Kernel API Manual, bestie edition 🎀

okay so this is struct landlock_path_beneath_attr from the Kernel API Manual, and it's genuinely the moment where you tell the kernel "hey, this little corner of the filesystem tree right here? that's the one I care about" 🌸 it's giving path hierarchy definition and honestly? iconic.

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✨ NAME ✨

struct landlock_path_beneath_attr — Path hierarchy definition 🦋

like, literally: you're defining which path hierarchy you're talking about. that's the whole vibe.

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💖 SYNOPSIS 💖

struct landlock_path_beneath_attr {
    __u64 allowed_access;
    __s32 parent_fd;
 };

not me noticing the little space before that last }; — yes bestie, it's in the original, we keep it exactly as-is 🙈

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🎀 Members 🎀

• allowed_access — a bitmask of all the allowed actions for this file hierarchy (cf. Filesystem flags_). so like... which things are you letting happen in here? that's this field. it's the permission-slip energy 👑
• parent_fd — a file descriptor, preferably opened with O_PATH, that identifies the parent directory of a file hierarchy, or honestly just a file, that works too 🫶 one fd, two possible meanings, lowkey flexible.

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🌈 Description 🌈

it's an argument of sys_landlock_add_rule. that's the whole job. it shows up, it gets passed in, it slays 💀✨

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👑 SEE ALSO 👑

the source of truth lives in ./include/uapi/linux/landlock.h — go read the family, they're all connected fr fr:

• struct landlock_ruleset_attr(9)
• landlock_create_ruleset_flags(9)
• landlock_add_rule_flags(9)
• landlock_restrict_self_flags(9)
• enum landlock_rule_type(9)
• struct landlock_net_port_attr(9)
• fs_access(9)
• net_access(9)
• scope(9)

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🧚 friendly reminder: parent_fd prefers O_PATH — it says "preferably", not "mandatory", but bestie, take the hint 💜

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and that's the page!! sourced from ./include/uapi/linux, dated October 2026, signed off with a struct land...beneath_attr(9) in the corner and a whole lot of love 💅 no cap, you now know this struct better than most people know their own passwords 💖✨