iommufd: Prevent ALIGN() overflow
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.2%
exploitation probability
0.2%top 95% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
iommufd: Prevent ALIGN() overflow
When allocating IOVA the candidate range gets aligned to the target
alignment. If the range is close to ULONG_MAX then the ALIGN() can
wrap resulting in a corrupted iova.
Open code the ALIGN() using get_add_overflow() to prevent this.
This simplifies the checks as we don't need to check for length earlier
either.
Consolidate the two copies of this code under a single helper.
This bug would allow userspace to create a mapping that overlaps with some
other mapping or a reserved range.
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/79fad1917802c28de51a479318a056a6fbe3e2f2https://git.kernel.org/stable/c/b42497e3c0e74db061eafad41c0cd7243c46436bhttps://git.kernel.org/stable/c/d19b817540c0abe84854a64ee9ee34cecc3bbeefhttps://git.kernel.org/stable/c/e42a046bb41dcdde4f766a17d8211842007ed537https://git.kernel.org/stable/c/ebb6021560b94649bec6b8faba6fe0dca2218e81