In the Linux kernel, the following vulnerability has been...
High severity
Unreviewed
Published
Apr 17, 2024
to the GitHub Advisory Database
•
Updated Oct 30, 2024
Description
Published by the National Vulnerability Database
Apr 17, 2024
Published to the GitHub Advisory Database
Apr 17, 2024
Last updated
Oct 30, 2024
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix hashtab overflow check on 32-bit arches
The hashtab code relies on roundup_pow_of_two() to compute the number of
hash buckets, and contains an overflow check by checking if the
resulting value is 0. However, on 32-bit arches, the roundup code itself
can overflow by doing a 32-bit left-shift of an unsigned long value,
which is undefined behaviour, so it is not guaranteed to truncate
neatly. This was triggered by syzbot on the DEVMAP_HASH type, which
contains the same check, copied from the hashtab code. So apply the same
fix to hashtab, by moving the overflow check to before the roundup.
References