CVE-2023-52633

Published: April 3, 2024Last modified: April 3, 2024

Description

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.

Severity score breakdown

Status

References

• https://git.kernel.org/stable/c/0c7478a2da3f5fe106b4658338873d50c86ac7ab
• https://git.kernel.org/stable/c/4f7dad73df4cdb2b7042103d3922745d040ad025
• https://git.kernel.org/stable/c/abe4eaa8618bb36c2b33e9cdde0499296a23448c
• https://git.kernel.org/stable/c/b427f55e9d4185f6f17cc1e3296eb8d0c4425283
• https://git.kernel.org/stable/c/de3e9d8e8d1ae0a4d301109d1ec140796901306c