In the Linux kernel, the following vulnerability has been...
Moderate severity
Unreviewed
Published
Jul 5, 2024
to the GitHub Advisory Database
•
Updated Jul 8, 2024
Description
Published by the National Vulnerability Database
Jul 5, 2024
Published to the GitHub Advisory Database
Jul 5, 2024
Last updated
Jul 8, 2024
In the Linux kernel, the following vulnerability has been resolved:
mm/hugetlb: do not call vma_add_reservation upon ENOMEM
sysbot reported a splat [1] on __unmap_hugepage_range(). This is because
vma_needs_reservation() can return -ENOMEM if
allocate_file_region_entries() fails to allocate the file_region struct
for the reservation.
Check for that and do not call vma_add_reservation() if that is the case,
otherwise region_abort() and region_del() will see that we do not have any
file_regions.
If we detect that vma_needs_reservation() returned -ENOMEM, we clear the
hugetlb_restore_reserve flag as if this reservation was still consumed, so
free_huge_folio() will not increment the resv count.
[1] https://lore.kernel.org/linux-mm/[email protected]/T/#ma5983bc1ab18a54910da83416b3f89f3c7ee43aa
References