common_perm_dir_dentry(9)

🦋 common_perm_dir_dentry(9) 🦋

okay so bestie, this is section (9) of the Kernel API Manual — yes, the kernel API manual, we’re in the big leagues now 💅. This page is literally about common_perm_dir_dentry, the common permission wrapper for when the path is a dir and the thing is a dentry. It’s giving “permission check but make it directory/dentry specific,” and honestly? iconic. Let’s go 🫶✨

✨ NAME ✨

common_perm_dir_dentry — common permission wrapper when path is dir, dentry. That’s the whole vibe: it’s the wrapper that handles the permission check when you’ve got a directory path and a dentry. No cap 🧚

🌸 SYNOPSIS 🌸

int common_perm_dir_dentry (const char *op , const struct path *dir ,
       struct dentry *dentry , u32 mask , struct path_cond *cond );

🎀 ARGUMENTS 🎀

okay bestie, here’s the cast — every single one matters:

• op — operation being checked. Like, what are we even doing here? This tells you 👀
• dir — directory of the dentry. NOT NULL, bestie — do not come in here with a null, fr fr 🙈
• dentry — dentry to check. Also NOT NULL — the audacity of a null dentry? not today 💀
• mask — requested permissions mask. The permissions wishlist, basically 🎀
• cond — conditional info for the permission request. NOT NULL — it’s required, no skipping 😤

the NOT NULL tags are not decorative, bestie — they’re the whole vibe check 🚨

💖 RETURN 💖

Returns 0 — slay ✅. Otherwise you get an error code if there’s an error or permission was denied. That’s it, that’s the tea ☕💅

🌈 SEE ALSO 🌈

Kernel file ./security/apparmor/lsm.c — and the whole squad is:

• common_perm(9)
• common_perm_cond(9)
• common_perm_rm(9)
• common_perm_create(9)
• apparmor_uring_override_creds(9)
• apparmor_uring_sqpoll(9)
• apparmor_bprm_committing_creds(9)
• apparmor_bprm_committed_creds(9)
• apparmor_sk_clone_security(9)
• apparmor_unix_stream_connect(9)
• apparmor_unix_may_send(9)
• apparmor_socket_post_create(9)
• apparmor_socket_bind(9)
• apparmor_socket_getpeersec_stream(9)
• apparmor_socket_getpeersec_dgram(9)
• apparmor_sock_graft(9)
• apparmor_socket_sock_rcv_skb(9)
• set_init_ctx(9)

mwah 💋 this page lives under ./security/apparmor, is dated October 2026, and is literally common_perm_dir_dentry(9). byeee, go check those permissions bestie 🫶🌈