From: Peter Xu <peterx@xxxxxxxxxx>
Subject: mm/userfaultfd: fix uffd-wp special cases for fork()
We tried to do something similar in b569a1760782 ("userfaultfd: wp: drop
_PAGE_UFFD_WP properly when fork") previously, but it's not doing it all
right.. A few fixes around the code path:
1. We were referencing VM_UFFD_WP vm_flags on the _old_ vma rather
than the new vma. That's overlooked in b569a1760782, so it won't work
as expected. Thanks to the recent rework on fork code
(7a4830c380f3a8b3), we can easily get the new vma now, so switch the
checks to that.
2. Dropping the uffd-wp bit in copy_huge_pmd() could be wrong if the
huge pmd is a migration huge pmd. When it happens, instead of using
pmd_uffd_wp(), we should use pmd_swp_uffd_wp(). The fix is simply to
handle them separately.
3. Forget to carry over uffd-wp bit for a write migration huge pmd
entry. This also happens in copy_huge_pmd(), where we converted a
write huge migration entry into a read one.
4. In copy_nonpresent_pte(), drop uffd-wp if necessary for swap ptes.
5. In copy_present_page() when COW is enforced when fork(), we also
need to pass over the uffd-wp bit if VM_UFFD_WP is armed on the new
vma, and when the pte to be copied has uffd-wp bit set.
Remove the comment in copy_present_pte() about this. It won't help a huge
lot to only comment there, but comment everywhere would be an overkill.
Let's assume the commit messages would help.
[peterx@xxxxxxxxxx: fix a few thp pmd missing uffd-wp bit]
Link: https://lkml.kernel.org/r/20210428225030.9708-4-peterx@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20210428225030.9708-3-peterx@xxxxxxxxxx
Fixes: b569a1760782f ("userfaultfd: wp: drop _PAGE_UFFD_WP properly when fork")
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
Cc: Jerome Glisse <jglisse@xxxxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Axel Rasmussen <axelrasmussen@xxxxxxxxxx>
Cc: Brian Geffon <bgeffon@xxxxxxxxxx>
Cc: "Dr . David Alan Gilbert" <dgilbert@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>
Cc: Lokesh Gidra <lokeshgidra@xxxxxxxxxx>
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Mina Almasry <almasrymina@xxxxxxxxxx>
Cc: Oliver Upton <oupton@xxxxxxxxxx>
Cc: Shaohua Li <shli@xxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Cc: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Cc: Wang Qing <wangqing@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/huge_mm.h | 2 +-
include/linux/swapops.h | 2 ++
mm/huge_memory.c | 27 ++++++++++++++-------------
mm/memory.c | 25 +++++++++++++------------
4 files changed, 30 insertions(+), 26 deletions(-)
--- a/include/linux/huge_mm.h~mm-userfaultfd-fix-uffd-wp-special-cases-for-fork
+++ a/include/linux/huge_mm.h
@@ -10,7 +10,7 @@
vm_fault_t do_huge_pmd_anonymous_page(struct vm_fault *vmf);
int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
- struct vm_area_struct *vma);
+ struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma);
void huge_pmd_set_accessed(struct vm_fault *vmf, pmd_t orig_pmd);
int copy_huge_pud(struct mm_struct *dst_mm, struct mm_struct *src_mm,
pud_t *dst_pud, pud_t *src_pud, unsigned long addr,
--- a/include/linux/swapops.h~mm-userfaultfd-fix-uffd-wp-special-cases-for-fork
+++ a/include/linux/swapops.h
@@ -265,6 +265,8 @@ static inline swp_entry_t pmd_to_swp_ent
if (pmd_swp_soft_dirty(pmd))
pmd = pmd_swp_clear_soft_dirty(pmd);
+ if (pmd_swp_uffd_wp(pmd))
+ pmd = pmd_swp_clear_uffd_wp(pmd);
arch_entry = __pmd_to_swp_entry(pmd);
return swp_entry(__swp_type(arch_entry), __swp_offset(arch_entry));
}
--- a/mm/huge_memory.c~mm-userfaultfd-fix-uffd-wp-special-cases-for-fork
+++ a/mm/huge_memory.c
@@ -1026,7 +1026,7 @@ struct page *follow_devmap_pmd(struct vm
int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
- struct vm_area_struct *vma)
+ struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma)
{
spinlock_t *dst_ptl, *src_ptl;
struct page *src_page;
@@ -1035,7 +1035,7 @@ int copy_huge_pmd(struct mm_struct *dst_
int ret = -ENOMEM;
/* Skip if can be re-fill on fault */
- if (!vma_is_anonymous(vma))
+ if (!vma_is_anonymous(dst_vma))
return 0;
pgtable = pte_alloc_one(dst_mm);
@@ -1049,14 +1049,6 @@ int copy_huge_pmd(struct mm_struct *dst_
ret = -EAGAIN;
pmd = *src_pmd;
- /*
- * Make sure the _PAGE_UFFD_WP bit is cleared if the new VMA
- * does not have the VM_UFFD_WP, which means that the uffd
- * fork event is not enabled.
- */
- if (!(vma->vm_flags & VM_UFFD_WP))
- pmd = pmd_clear_uffd_wp(pmd);
-
#ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
if (unlikely(is_swap_pmd(pmd))) {
swp_entry_t entry = pmd_to_swp_entry(pmd);
@@ -1067,11 +1059,15 @@ int copy_huge_pmd(struct mm_struct *dst_
pmd = swp_entry_to_pmd(entry);
if (pmd_swp_soft_dirty(*src_pmd))
pmd = pmd_swp_mksoft_dirty(pmd);
+ if (pmd_swp_uffd_wp(*src_pmd))
+ pmd = pmd_swp_mkuffd_wp(pmd);
set_pmd_at(src_mm, addr, src_pmd, pmd);
}
add_mm_counter(dst_mm, MM_ANONPAGES, HPAGE_PMD_NR);
mm_inc_nr_ptes(dst_mm);
pgtable_trans_huge_deposit(dst_mm, dst_pmd, pgtable);
+ if (!userfaultfd_wp(dst_vma))
+ pmd = pmd_swp_clear_uffd_wp(pmd);
set_pmd_at(dst_mm, addr, dst_pmd, pmd);
ret = 0;
goto out_unlock;
@@ -1107,11 +1103,11 @@ int copy_huge_pmd(struct mm_struct *dst_
* best effort that the pinned pages won't be replaced by another
* random page during the coming copy-on-write.
*/
- if (unlikely(page_needs_cow_for_dma(vma, src_page))) {
+ if (unlikely(page_needs_cow_for_dma(src_vma, src_page))) {
pte_free(dst_mm, pgtable);
spin_unlock(src_ptl);
spin_unlock(dst_ptl);
- __split_huge_pmd(vma, src_pmd, addr, false, NULL);
+ __split_huge_pmd(src_vma, src_pmd, addr, false, NULL);
return -EAGAIN;
}
@@ -1121,8 +1117,9 @@ int copy_huge_pmd(struct mm_struct *dst_
out_zero_page:
mm_inc_nr_ptes(dst_mm);
pgtable_trans_huge_deposit(dst_mm, dst_pmd, pgtable);
-
pmdp_set_wrprotect(src_mm, addr, src_pmd);
+ if (!userfaultfd_wp(dst_vma))
+ pmd = pmd_clear_uffd_wp(pmd);
pmd = pmd_mkold(pmd_wrprotect(pmd));
set_pmd_at(dst_mm, addr, dst_pmd, pmd);
@@ -1835,6 +1832,8 @@ int change_huge_pmd(struct vm_area_struc
newpmd = swp_entry_to_pmd(entry);
if (pmd_swp_soft_dirty(*pmd))
newpmd = pmd_swp_mksoft_dirty(newpmd);
+ if (pmd_swp_uffd_wp(*pmd))
+ newpmd = pmd_swp_mkuffd_wp(newpmd);
set_pmd_at(mm, addr, pmd, newpmd);
}
goto unlock;
@@ -3245,6 +3244,8 @@ void remove_migration_pmd(struct page_vm
pmde = pmd_mksoft_dirty(pmde);
if (is_write_migration_entry(entry))
pmde = maybe_pmd_mkwrite(pmde, vma);
+ if (pmd_swp_uffd_wp(*pvmw->pmd))
+ pmde = pmd_wrprotect(pmd_mkuffd_wp(pmde));
flush_cache_range(vma, mmun_start, mmun_start + HPAGE_PMD_SIZE);
if (PageAnon(new))
--- a/mm/memory.c~mm-userfaultfd-fix-uffd-wp-special-cases-for-fork
+++ a/mm/memory.c
@@ -707,10 +707,10 @@ out:
static unsigned long
copy_nonpresent_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm,
- pte_t *dst_pte, pte_t *src_pte, struct vm_area_struct *vma,
- unsigned long addr, int *rss)
+ pte_t *dst_pte, pte_t *src_pte, struct vm_area_struct *dst_vma,
+ struct vm_area_struct *src_vma, unsigned long addr, int *rss)
{
- unsigned long vm_flags = vma->vm_flags;
+ unsigned long vm_flags = dst_vma->vm_flags;
pte_t pte = *src_pte;
struct page *page;
swp_entry_t entry = pte_to_swp_entry(pte);
@@ -779,6 +779,8 @@ copy_nonpresent_pte(struct mm_struct *ds
set_pte_at(src_mm, addr, src_pte, pte);
}
}
+ if (!userfaultfd_wp(dst_vma))
+ pte = pte_swp_clear_uffd_wp(pte);
set_pte_at(dst_mm, addr, dst_pte, pte);
return 0;
}
@@ -844,6 +846,9 @@ copy_present_page(struct vm_area_struct
/* All done, just insert the new page copy in the child */
pte = mk_pte(new_page, dst_vma->vm_page_prot);
pte = maybe_mkwrite(pte_mkdirty(pte), dst_vma);
+ if (userfaultfd_pte_wp(dst_vma, *src_pte))
+ /* Uffd-wp needs to be delivered to dest pte as well */
+ pte = pte_wrprotect(pte_mkuffd_wp(pte));
set_pte_at(dst_vma->vm_mm, addr, dst_pte, pte);
return 0;
}
@@ -893,12 +898,7 @@ copy_present_pte(struct vm_area_struct *
pte = pte_mkclean(pte);
pte = pte_mkold(pte);
- /*
- * Make sure the _PAGE_UFFD_WP bit is cleared if the new VMA
- * does not have the VM_UFFD_WP, which means that the uffd
- * fork event is not enabled.
- */
- if (!(vm_flags & VM_UFFD_WP))
+ if (!userfaultfd_wp(dst_vma))
pte = pte_clear_uffd_wp(pte);
set_pte_at(dst_vma->vm_mm, addr, dst_pte, pte);
@@ -973,7 +973,8 @@ again:
if (unlikely(!pte_present(*src_pte))) {
entry.val = copy_nonpresent_pte(dst_mm, src_mm,
dst_pte, src_pte,
- src_vma, addr, rss);
+ dst_vma, src_vma,
+ addr, rss);
if (entry.val)
break;
progress += 8;
@@ -1050,8 +1051,8 @@ copy_pmd_range(struct vm_area_struct *ds
|| pmd_devmap(*src_pmd)) {
int err;
VM_BUG_ON_VMA(next-addr != HPAGE_PMD_SIZE, src_vma);
- err = copy_huge_pmd(dst_mm, src_mm,
- dst_pmd, src_pmd, addr, src_vma);
+ err = copy_huge_pmd(dst_mm, src_mm, dst_pmd, src_pmd,
+ addr, dst_vma, src_vma);
if (err == -ENOMEM)
return -ENOMEM;
if (!err)
_
