Currently CPA is not used for user mappings (only pgd of init_mm or and efi_mm is used). For simplicity, always fail when user address is passed. Note that efi_mm uses 1:1 mapping so its address should not be considered as user address. Signed-off-by: Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx> --- arch/x86/mm/pat/set_memory.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index 1abd5438f126..67cf969fed0d 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -20,6 +20,7 @@ #include <linux/kernel.h> #include <linux/cc_platform.h> #include <linux/set_memory.h> +#include <linux/efi.h> #include <asm/e820/api.h> #include <asm/processor.h> @@ -1514,6 +1515,11 @@ static int __change_page_attr(struct cpa_data *cpa, int primary) pte_t *kpte, old_pte; address = __cpa_addr(cpa, cpa->curpage); + + if (WARN((IS_ENABLED(CONFIG_EFI) ? cpa->pgd != efi_mm.pgd : true) + && address <= TASK_SIZE_MAX, + KERN_WARNING "CPA: Got a user address")) + return -EINVAL; repeat: kpte = _lookup_address_cpa(cpa, address, &level); if (!kpte) -- 2.32.0
