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58ff3f9d2b
The version floor I added two commits ago was one release too low. drmtap_open_render and drmtap_convert_dmabuf are 0.4.9, but drmtap_grab_desc is 0.4.10, so a genuine 0.4.9 library passed the version gate and was then refused by the symbol gate with a message that called it a stale or pre-release build, which it is not. The floor is 0.4.10 now, the release where the whole split API exists, and the test lists 0.4.9 among the rejected versions with the reason. ExportLedger is deleted. DRM_FD_ELISION was false, so should_send_fd returned true at its first branch and about sixty lines of eviction and epoch machinery were unreachable, untested, in a security sensitive file. Why it was disabled is worth keeping, so here it is: eliding the fd on an fb_id the converter has already imported looks free, but the kernel can recycle an fb_id onto a different buffer with identical geometry and modifier, and the exporter cannot see the dma-buf inode that would tell the difference, so the elision can serve a stale EGLImage. Sending it is cheap, the converter imports once per buffer and closes the surplus fd, and libdrmtap's own cache keys on fb_id AND inode and can only re-import when it is handed a real fd. That reasoning now lives here instead of in dead code. The rest: - num_planes is clamped on the consumer before it reaches the C descriptor. The producer normalizes it and must be root, so this is only defense in depth, but the wire is the one place the value arrives from another process. - warm_availability returns early on X11. Nothing there can consume a DRM stream, and probing makes the ROOT service open DRM readers, so an X11 host running a drm build was paying that at every startup for a path it can never take. - drm_cursor_id no longer clones the cursor. The cursor service polls it at frame cadence to compare eight bytes, and a 256x256 cursor is 256 KiB. - The premultiplied ARGB pass-through is now documented as matching the XFixes path, since that is why it is correct rather than an oversight. - cfg hygiene: input_service.rs uses all(target_os = "linux", feature = "drm") like every other site, and active_uid_cached is gated with the feature too, which also removes a dead-code warning from drm-off Linux builds. - Nits: DrmConn is pub(crate) like its constructors, new_drm_listener is no longer async with nothing to await, and the two anyhow! plus return Err pairs are bail! as the codebase writes them. - DRM_CAPTURE_SECURITY.md moves to docs/ with the other docs, and its "no privileged child process is ever spawned" claim is corrected: an empty helper_path is not a disable switch in the C, find_helper searches six fixed paths and would exec one if the direct export ever failed. It is unreachable here for two independent reasons, the root service holds CAP_SYS_ADMIN so the direct path succeeds and the package builds no helper at all, and the paths are root-writable only, so the accurate statement is that this package never installs one, not that it can never happen. - The comments that narrated the review rather than the code are rewritten to say what the code does. One of them had also drifted: the convert context is opened before we answer with DrmStart, not before the handshake. Both configs build with no new warnings, 100 tests pass.