In the Linux kernel, the following vulnerability has been...
Unreviewed
Published
Apr 2, 2024
to the GitHub Advisory Database
•
Updated Apr 2, 2024
Description
Published by the National Vulnerability Database
Apr 2, 2024
Published to the GitHub Advisory Database
Apr 2, 2024
Last updated
Apr 2, 2024
In the Linux kernel, the following vulnerability has been resolved:
um: time-travel: fix time corruption
In 'basic' time-travel mode (without =inf-cpu or =ext), we
still get timer interrupts. These can happen at arbitrary
points in time, i.e. while in timer_read(), which pushes
time forward just a little bit. Then, if we happen to get
the interrupt after calculating the new time to push to,
but before actually finishing that, the interrupt will set
the time to a value that's incompatible with the forward,
and we'll crash because time goes backwards when we do the
forwarding.
Fix this by reading the time_travel_time, calculating the
adjustment, and doing the adjustment all with interrupts
disabled.
References