CVE-2022-49710 Information

Description

In the Linux kernel the following vulnerability has been resolved:

dm mirror log: round up region bitmap size to BITS_PER_LONG

The code in dm-log rounds up bitset_size to 32 bits. It then uses find_next_zero_bit_le on the allocated region. find_next_zero_bit_le accesses the bitmap using unsigned long pointers. So on 64-bit architectures it may access 4 bytes beyond the allocated size.

Fix this bug by rounding up bitset_size to BITS_PER_LONG.

This bug was found by running the lvm2 testsuite with kasan.

Reference

https://git.kernel.org/stable/c/0d2209b54f1de0c2f99cab246d4cf2cfe24aaaa9 https://git.kernel.org/stable/c/85e123c27d5cbc22cfdc01de1e2ca1d9003a02d0 https://git.kernel.org/stable/c/9a02f3275acc628c0d956be771405ced79ac36df https://git.kernel.org/stable/c/ae460312875159285cef5bf3dc654593f404a1ef https://git.kernel.org/stable/c/ba751f0d25f07aa21ce9b85372a3792bf7969d13