bpf_get_task_exe_file(9)

💅 bpf_get_task_exe_file(9) — Kernel API Manual

okay so bestie, welcome to the <pink>bpf_get_task_exe_file</pink> page, it's living in the Kernel API Manual and it's lowkey iconic 🎀

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✨ NAME ✨

bpf_get_task_exe_file — grab yourself a reference on the exe_file struct file member of the mm_struct that's nested inside the task_struct you hand over 🫶

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🌸 SYNOPSIS 🌸

__bpf_kfunc struct file * bpf_get_task_exe_file (struct task_struct
*task );

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🦋 ARGUMENTS 🦋

• task — the task_struct whose nested mm_struct exe_file member you wanna get a reference on 💖

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💫 DESCRIPTION 💫

So basically: you get a reference on the exe_file struct file member field of the mm_struct nested within the supplied task. Simple as that, no cap ✨

🚨 THE RULE, bestie: the referenced file pointer you just acquired with this BPF kfunc must be released using bpf_put_file. If you don't call bpf_put_file on that returned referenced struct file pointer — the one you got from this BPF kfunc — the BPF program gets rejected by the BPF verifier. like, immediately. the verifier does not play 💀

Also important: this BPF kfunc may only be called from BPF LSM programs. that's the vibe check and it's strict 🙈

Internally, this BPF kfunc leans on get_task_exe_file, so calling bpf_get_task_exe_file would be analogous to calling get_task_exe_file directly in kernel context 👑

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🌈 RETURN 🌈

A referenced struct file pointer to the exe_file member of the mm_struct that's nested within the supplied task. 🎀

On error, NULL is returned. that's it, that's the whole story 😭

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⭐ SEE ALSO ⭐

• Kernel file ./fs/bpf_fs_kfuncs.c — go read it, iykyk 📖
• bpf_put_file(9)
• bpf_path_d_path(9)
• bpf_get_dentry_xattr(9)
• bpf_get_file_xattr(9)
• bpf_set_dentry_xattr_locked(9)
• bpf_remove_dentry_xattr_locked(9)
• bpf_set_dentry_xattr(9)
• bpf_remove_dentry_xattr(9)
• bpf_cgroup_read_xattr(9)
• bpf_sock_read_xattr(9)
• bpf_real_data_inode(9)

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kk that's the whole page bestie, go release that reference before the verifier comes for you 💅✨

mwah 💖 this one's from ./fs, October 2026, and yeah — the page is literally called bpf_get_task_exe_file(9), iconic behavior only 🎀