STRUCT DRM_VC4_CREATE_SHADER_BO(9)

✨ struct drm_vc4_create_shader_bo — Kernel API Manual ✨

okay so bestie, welcome to the Kernel API Manual, and buckle up because this one is a little struct with a lot of opinions 💅

🎀 NAME 🎀

struct drm_vc4_create_shader_bo — the ioctl argument for creating VC4 shader BOs. yes that's the whole name, she's long but she's iconic 🤍

🌸 SYNOPSIS 🌸

struct drm_vc4_create_shader_bo {
    __u32 size;
    __u32 flags;
    __u64 data;
    __u32 handle;
    __u32 pad;
 };

like, look at her. five fields. flawless. no notes 🫶

🦋 Members 🦋

the full cast is right up there in the SYNOPSIS — size, flags, data, handle, pad — that's the entire squad, no extras, no surprises ✨

🔥 Description 🔥

okay so here's the drama: if a shader could get overwritten while it's also being executed, that would allow privilege escalation 😭 and we are simply not doing that.

so. shaders must be created using this ioctl. that's the rule, that's the whole vibe.

and they can't be mmapped later — no mmap for these babies, ever, no cap. 🔒

fr fr take this seriously — the "no overwriting while executing" and "no mmap afterwards" bits are the entire security model here, don't go looking for a loophole 🙈

🌈 SEE ALSO 🌈

• Kernel file ./include/uapi/drm/vc4_drm.h
• struct drm_vc4_submit_cl(9)
• struct drm_vc4_wait_seqno(9)
• struct drm_vc4_wait_bo(9)
• struct drm_vc4_create_bo(9)
• struct drm_vc4_mmap_bo(9)
• struct drm_vc4_label_bo(9)

and that's the page, bestie 💖 this one came straight out of ./include/uapi/drm, dated October 2026, and honestly? she ate. 👑 go read the SEE ALSOs, ily, bye 🎀🦋