Module: wine Branch: master Commit: ab3416c61fb17207e0831f7709da4d2911b07fb2 URL: https://source.winehq.org/git/wine.git/?a=commit;h=ab3416c61fb17207e0831f770... Author: Simon McVittie <smcv(a)collabora.com> Date: Wed Oct 20 11:07:27 2021 +0200 winebus.sys: Add code path to bypass udevd and use inotify. In a container with a non-trivial user namespace, we cannot rely on libudev communicating with udevd as a way to monitor device nodes, for the following reasons: * If uid 0 from the host is not mapped to uid 0 in the container, libudev cannot authenticate netlink messages from the host, because their sender uid appears to be the overflowuid. Resolving this by mapping uid 0 into the container is not allowed when creating user namespaces as an unprivileged user, and even when running as a privileged user, it might be desirable for the real uid 0 to not be mapped as a way to harden the security boundary between container and host. * Depending on the container configuration, initial enumeration might not be able to read /run/udev from the host system. If it can't, sysfs attributes will still work because those are read directly from the kernel via sysfs, but udev properties coming from user-space rules (in particular ID_INPUT_JOYSTICK and friends) will appear to be missing. * The protocols between udevd and libudev (netlink messages for monitoring, and /run/udev for initial enumeration) are considered to be private to a particular version of udev, and are not a stable API; but in a container, we cannot expect that our copy of libudev is at exactly the same version as udevd on the host system. Sidestep this by adding a code path that continues to use libudev for the parts that work regardless of whether udevd is running or can be communicated with. Signed-off-by: Rémi Bernon <rbernon(a)codeweavers.com> Signed-off-by: Alexandre Julliard <julliard(a)winehq.org> --- dlls/winebus.sys/bus_udev.c | 276 ++++++++++++++++++++++++++++++++++++++++++-- dlls/winebus.sys/main.c | 2 + dlls/winebus.sys/unixlib.h | 1 + 3 files changed, 268 insertions(+), 11 deletions(-) Diff: https://source.winehq.org/git/wine.git/?a=commitdiff;h=ab3416c61fb17207e0831...