Commit f087df84 authored by ZhangPeng's avatar ZhangPeng Committed by Ma Wupeng
Browse files

userswap: mark swap-out buffer PTE as writable 

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I6CAIM



--------------------------------

Add a VM_WRITE check for the swap-out buffer. If the swap-out buffer VMA
contains VM_WRITE, the PTE should be marked as writable.

Signed-off-by: default avatarZhangPeng <zhangpeng362@huawei.com>
parent a81fb608

mm/userswap.c

+5 −2
Original line number Diff line number Diff line
@@ -215,7 +215,7 @@ static unsigned long vm_insert_anon_page(struct vm_area_struct *vma, 
{

	struct mm_struct *mm = vma->vm_mm;

	int ret = 0;

	pte_t *pte;

	pte_t *pte, dst_pte;

	spinlock_t *ptl;



	if (unlikely(anon_vma_prepare(vma)))
@@ -233,7 +233,10 @@ static unsigned long vm_insert_anon_page(struct vm_area_struct *vma, 
	inc_mm_counter(mm, MM_ANONPAGES);

	reliable_page_counter(page, mm, 1);

	page_add_new_anon_rmap(page, vma, addr, false);

	set_pte_at(mm, addr, pte, mk_pte(page, vma->vm_page_prot));

	dst_pte = mk_pte(page, vma->vm_page_prot);

	if (vma->vm_flags & VM_WRITE)

		dst_pte = pte_mkwrite(pte_mkdirty(dst_pte));

	set_pte_at(mm, addr, pte, dst_pte);



out_unlock:

	pte_unmap_unlock(pte, ptl);