Thanks Fan, this scenario works to reproduce on v4.9.
And following fix works for v4.9:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?h=linux-4.9.y&id=44cb51d5b4a736446b728bbde8407844d71843ef
-Ajay
Hi Ajay,
> On Jun 5, 2020 at 02:23，Ajay Kaher wrote：
>
> So, v4.9.y should be vulnerable, however not able to reproduce on v4.9.y.
> Does any specific scenerio need to test for v4.9.y?
>
> For v4.9, modified test program as MAP_SHARED_VALIDATE is not available:
> - return mmap(NULL, REGION_PM_S
Hi Fan,
Able to reproduce this issue on v4.19.y using your test program.
And as per commit message it fixes commit 5c7fb56e5e3f
("mm, dax: dax-pmd vs thp-pmd vs hugetlbfs-pm”) at kernel version v4.5.
So, v4.9.y should be vulnerable, however not able to reproduce on v4.9.y.
Does any specific scen
The original code in mm/mremap.c checks huge pmd by:
if (is_swap_pmd(*old_pmd) || pmd_trans_huge(*old_pmd)) {
However, a DAX mapped nvdimm is mapped as huge page (by default) but
it is not transparent huge page (_PAGE_PSE | PAGE_DEVMAP). This
commit changes the condition to inclu
Hi,
The original code in mm/mremap.c checks huge pmd by:
if (is_swap_pmd(*old_pmd) || pmd_trans_huge(*old_pmd)) {
However, a DAX mapped nvdimm is mapped as huge page (by default) but
it is not transparent huge page (_PAGE_PSE | PAGE_DEVMAP). This
commit changes the condition to
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