Hello,
Some architectures can now support EXEC_ONLY mappings and I am wondering what get_user_pages() on those addresses should return. Earlier PROT_EXEC implied PROT_READ and pte_access_permitted() returned true for that. But arm64 does have this explicit comment that says /* * p??_access_permitted() is true for valid user mappings (PTE_USER * bit set, subject to the write permission check). For execute-only * mappings, like PROT_EXEC with EPAN (both PTE_USER and PTE_UXN bits * not set) must return false. PROT_NONE mappings do not have the * PTE_VALID bit set. */ Is that correct? We should be able to get struct page for PROT_EXEC mappings? -aneesh
