** Also affects: linux-oem-6.1 (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux-oem-6.1 (Ubuntu Jammy)
Status: New => Fix Committed
** Changed in: linux-oem-6.1 (Ubuntu Focal)
Status: New => Invalid
** Changed in: linux-oem-6.1 (Ubuntu Lunar)
Status: New => Invalid
** Changed in: linux-oem-6.1 (Ubuntu Mantic)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2035116
Title:
allow io_uring to be disabled in runtime
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-6.1 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Triaged
Status in linux-oem-6.1 source package in Focal:
Invalid
Status in linux source package in Jammy:
Triaged
Status in linux-oem-6.1 source package in Jammy:
Fix Committed
Status in linux source package in Lunar:
In Progress
Status in linux-oem-6.1 source package in Lunar:
Invalid
Status in linux source package in Mantic:
In Progress
Status in linux-oem-6.1 source package in Mantic:
Invalid
Bug description:
[Impact]
io_uring has been an important attack vector in the recent years in local
privilege escalation attacks. Allowing admins that don't use io_uring to
disable it in their systems allows them to reduce their attack surface.
[Test case]
sysctl -w kernel.io_uring_disabled=1
then try to use io_uring from an unprivileged user, then try it with
privileges (CAP_SYS_ADMIN)
Actually also tried setting kernel.io_uring_disabled=2 and checking that
neither (privileged or unprivileged worked).
Then testing setting it back to 0.
Then tested with io_uring_disabled set to 1 and io_uring_group=1000 and
that it worked for group 1000, then set it to 1001 and verified that it
didn't work anymore for group 1000.
[Potential regression]
Uses can be denied from using io_uring.
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