Jan Koester wrote:

Hi,

Building the UUID/GUID id RFC (uid_r v2, cover.1792552161.git.jan.koester@tuxist.de) with a distribution config instead of the one I had tested with turned up three users of kuid_t/kgid_t it doesn't build with: kuid_t is a tagged union now and has no .val, and it no longer fits READ_ONCE()/WRITE_ONCE().

1/3 tun: TUNSETOWNER/TUNSETGROUP write the owner and group under RTNL, tun_fill_info() may read them without it. Mark that read as data_race() instead of READ_ONCE(). Only classic ids from make_kuid()/make_kgid() are ever stored there.

2/3 accel/ivpu: the per-user context limits are keyed by __kuid_val(). UUID and GUID users share the (uid_t)-1 bucket, which only makes the limit stricter for them.

3/3 tee: the TEE_IOCTL_LOGIN_USER client UUID is derived from the classic uid. With __kuid_val() alone every UUID or GUID user would get the same one and could act as any other such user towards the TEE, so those logins are refused with -EPERM, like ublk refuses unprivileged devices to them in the series.

These belong into the series before the patch that lets kuid_t and kgid_t hold a UUID or a GUID and will be folded in there in v3; I'm sending them now so that the reviewers of these drivers see what uid_r means for them.

Jan Koester (3): tun: read the owner and group without READ_ONCE() accel/ivpu: key user limits by __kuid_val() tee: refuse user logins of UUID and GUID users

drivers/accel/ivpu/ivpu_drv.c | 2 +- drivers/net/tun.c | 8 ++++---- drivers/tee/tee_core.c | 13 +++++++++++-- 3 files changed, 16 insertions(+), 7 deletions(-)

I only received this cover letter. Also do not see the patches on https://lore.kernel.org/all