Threats Tagged 'cve-2025-40124'

A vulnerability in the Linux kernel related to the sparc architecture has been resolved. The issue involved inaccurate exception reporting in the copy_from_user and copy_to_user functions for UltraSPARC III processors. Specifically, a BUG_ON in ext4 code with large folios was triggered due to copy_from_user returning values larger than the size to be copied, causing __copy_from_iter to return impossible values. The root cause was improper masking of register %o2 during the bulk copy loop in exception handlers. This flaw affected the correctness of return values in fault cases but did not change memcpy behavior.

In the Linux kernel, the following vulnerability has been resolved: sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC III Anthony Yznaga tracked down that a BUG_ON in ext4 code with large folios enabled resulted from copy_from_user() returning impossibly large values greater than the size to be copied. This lead to __copy_from_iter() returning impossible values instead of the actual number of bytes it was able to copy. The BUG_ON has been reported in https://lore.kernel.org/r/b14f55642207e63e907965e209f6323a0df6dcee.camel@physik.fu-berlin.de The referenced commit introduced exception handlers on user-space memory references in copy_from_user and copy_to_user. These handlers return from the respective function and calculate the remaining bytes left to copy using the current register contents. The exception handlers expect that %o2 has already been masked during the bulk copy loop, but the masking was performed after that loop. This will fix the return value of copy_from_user and copy_to_user in the faulting case. The behaviour of memcpy stays unchanged.