** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Changed in: linux (Ubuntu Bionic)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1831103
Title:
bionic: netlink: potential shift overflow in netlink_bind()
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Bionic:
Confirmed
Bug description:
[Impact]
The check for correctness of netlink_bind() userspace supplied
parameter is done by applying a bitmask made from ngroups shift.
However if we have more than 64 groups the shift results in an
overflow causing an incorrect validation of the netlink_bind()
parameters.
This has been fixed upstream:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=91874ecf32e41b5d86a4cb9d60e0bee50d828058
And this fix has been applied to xenial, cosmic and disco (apparently
only bionic is missing it).
[Test Case]
I've been able to reproduce this problem using a script with acpid to
handle ACPI hibernate events. The script is the following:
$ cat /etc/acpi/actions/sleep.sh
#!/bin/sh
echo "1=$1 2=$2" >> /home/ubuntu/acpi-event.log
Any kernel that has the fix (xenial and cosmic for example) are
logging two events (input and netlink) when the sleep button is fired:
$ cat /home/ubuntu/acpi-event.log
1=button/sleep 2=SBTN
1=button/sleep 2=LNXSLPBN:00
The bionic kernel, instead, is logging only one event (input, netlink
is lost):
$ cat /home/ubuntu/acpi-event.log
1=button/sleep 2=SBTN
[Fix]
Fix that solves this problem:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=91874ecf32e41b5d86a4cb9d60e0bee50d828058
[Regression Potential]
Upsteram fix, tested on the affected platform, all other kernel
releases have this fix applied already, so regression potential is
minimal.
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