diff options
| -rw-r--r-- | include/linux/mm.h | 3 | ||||
| -rw-r--r-- | mm/hugetlb.c | 2 | ||||
| -rw-r--r-- | mm/memory.c | 13 | ||||
| -rw-r--r-- | mm/userfaultfd.c | 2 |
4 files changed, 14 insertions, 6 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 6bc7f2c1a6d1..c3e2be2b3296 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2426,7 +2426,8 @@ extern void copy_user_huge_page(struct page *dst, struct page *src, unsigned int pages_per_huge_page); extern long copy_huge_page_from_user(struct page *dst_page, const void __user *usr_src, - unsigned int pages_per_huge_page); + unsigned int pages_per_huge_page, + bool allow_pagefault); #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ extern struct page_ext_operations debug_guardpage_ops; diff --git a/mm/hugetlb.c b/mm/hugetlb.c index dec628b26f59..5d20af921a30 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -3973,7 +3973,7 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, ret = copy_huge_page_from_user(page, (const void __user *) src_addr, - pages_per_huge_page(h)); + pages_per_huge_page(h), false); /* fallback to copy_from_user outside mmap_sem */ if (unlikely(ret)) { diff --git a/mm/memory.c b/mm/memory.c index 4ade940d105c..d7676a68c80a 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -4155,7 +4155,8 @@ void copy_user_huge_page(struct page *dst, struct page *src, long copy_huge_page_from_user(struct page *dst_page, const void __user *usr_src, - unsigned int pages_per_huge_page) + unsigned int pages_per_huge_page, + bool allow_pagefault) { void *src = (void *)usr_src; void *page_kaddr; @@ -4163,11 +4164,17 @@ long copy_huge_page_from_user(struct page *dst_page, unsigned long ret_val = pages_per_huge_page * PAGE_SIZE; for (i = 0; i < pages_per_huge_page; i++) { - page_kaddr = kmap_atomic(dst_page + i); + if (allow_pagefault) + page_kaddr = kmap(dst_page + i); + else + page_kaddr = kmap_atomic(dst_page + i); rc = copy_from_user(page_kaddr, (const void __user *)(src + i * PAGE_SIZE), PAGE_SIZE); - kunmap_atomic(page_kaddr); + if (allow_pagefault) + kunmap(dst_page + i); + else + kunmap_atomic(page_kaddr); ret_val -= (PAGE_SIZE - rc); if (rc) diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c index ef0495bfd17a..09976745be23 100644 --- a/mm/userfaultfd.c +++ b/mm/userfaultfd.c @@ -274,7 +274,7 @@ retry: err = copy_huge_page_from_user(page, (const void __user *)src_addr, - pages_per_huge_page(h)); + pages_per_huge_page(h), true); if (unlikely(err)) { err = -EFAULT; goto out; |