> On Jul 8, 2023, at 03:38, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > > On Fri, 7 Jul 2023 11:38:59 +0800 Muchun Song <songmuchun@xxxxxxxxxxxxx> wrote: > >> The local variable @page in __split_vmemmap_huge_pmd() to obtain a pmd >> page without holding page_table_lock may possiblely get the page table >> page instead of a huge pmd page. The effect may be in set_pte_at() >> since we may pass an invalid page struct, if set_pte_at() wants to >> access the page struct (e.g. CONFIG_PAGE_TABLE_CHECK is enabled), it >> may crash the kernel. So fix it. And inline __split_vmemmap_huge_pmd() >> since it only has one user. > > Is this likely enough to justify a backport? > > I'm thinking "add cc:stable and merge into 6.6-rc1", so it hits -stable > after a couple of months of testing. > Hi Andrew, It is better to backport it to stable. Could you help me add it? Thanks.
