The patch titled
Subject: userfaultfd-mcopy_atomic-return-enoent-when-no-compatible-vma-found-fix-2-fix-fix
has been added to the -mm tree. Its filename is
userfaultfd-mcopy_atomic-return-enoent-when-no-compatible-vma-found-fix-2-fix-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/userfaultfd-mcopy_atomic-return-enoent-when-no-compatible-vma-found-fix-2-fix-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/userfaultfd-mcopy_atomic-return-enoent-when-no-compatible-vma-found-fix-2-fix-fix.patch
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------------------------------------------------------
From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Subject: userfaultfd-mcopy_atomic-return-enoent-when-no-compatible-vma-found-fix-2-fix-fix
Cc: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/userfaultfd.c | 21 +++++++--------------
1 file changed, 7 insertions(+), 14 deletions(-)
diff -puN mm/userfaultfd.c~userfaultfd-mcopy_atomic-return-enoent-when-no-compatible-vma-found-fix-2-fix-fix mm/userfaultfd.c
--- a/mm/userfaultfd.c~userfaultfd-mcopy_atomic-return-enoent-when-no-compatible-vma-found-fix-2-fix-fix
+++ a/mm/userfaultfd.c
@@ -212,22 +212,17 @@ retry:
dst_start + len > dst_vma->vm_end)
goto out_unlock;
- vm_shared = dst_vma->vm_flags & VM_SHARED;
-
err = -EINVAL;
if (vma_hpagesize != vma_kernel_pagesize(dst_vma))
goto out_unlock;
+
+ vm_shared = dst_vma->vm_flags & VM_SHARED;
}
- err = -EINVAL;
if (WARN_ON(dst_addr & (vma_hpagesize - 1) ||
(len - copied) & (vma_hpagesize - 1)))
goto out_unlock;
- if (dst_start < dst_vma->vm_start ||
- dst_start + len > dst_vma->vm_end)
- goto out_unlock;
-
/*
* If not shared, ensure the dst_vma has a anon_vma.
*/
@@ -410,9 +405,6 @@ retry:
dst_vma = find_vma(dst_mm, dst_start);
if (!dst_vma)
goto out_unlock;
-
- err = -EINVAL;
-
/*
* Be strict and only allow __mcopy_atomic on userfaultfd
* registered ranges to prevent userland errors going
@@ -425,6 +417,11 @@ retry:
if (!dst_vma->vm_userfaultfd_ctx.ctx)
goto out_unlock;
+ if (dst_start < dst_vma->vm_start ||
+ dst_start + len > dst_vma->vm_end)
+ goto out_unlock;
+
+ err = -EINVAL;
/*
* shmem_zero_setup is invoked in mmap for MAP_ANONYMOUS|MAP_SHARED but
* it will overwrite vm_ops, so vma_is_anonymous must return false.
@@ -433,10 +430,6 @@ retry:
dst_vma->vm_flags & VM_SHARED))
goto out_unlock;
- if (dst_start < dst_vma->vm_start ||
- dst_start + len > dst_vma->vm_end)
- goto out_unlock;
-
/*
* If this is a HUGETLB vma, pass off to appropriate routine
*/
_
Patches currently in -mm which might be from aarcange@xxxxxxxxxx are
userfaultfd-document-_ior-_iow.patch
userfaultfd-correct-comment-about-uffd_feature_pagefault_flag_wp.patch
userfaultfd-convert-bug-to-warn_on_once.patch
userfaultfd-use-vma_is_anonymous.patch
userfaultfd-non-cooperative-report-all-available-features-to-userland.patch
userfaultfd-non-cooperative-add-fork-event-build-warning-fix.patch
userfaultfd-non-cooperative-optimize-mremap_userfaultfd_complete.patch
userfaultfd-non-cooperative-avoid-madv_dontneed-race-condition.patch
userfaultfd-non-cooperative-wake-userfaults-after-uffdio_unregister.patch
userfaultfd-hugetlbfs-gup-support-vm_fault_retry.patch
userfaultfd-hugetlbfs-uffd_feature_missing_hugetlbfs.patch
userfaultfd-shmem-add-tlbflushh-header-for-microblaze.patch
userfaultfd-shmem-lock-the-page-before-adding-it-to-pagecache.patch
userfaultfd-shmem-avoid-a-lockup-resulting-from-corrupted-page-flags.patch
userfaultfd-shmem-avoid-leaking-blocks-and-used-blocks-in-uffdio_copy.patch
userfaultfd-hugetlbfs-uffd_feature_missing_shmem.patch
userfaultfd-selftest-test-uffdio_zeropage-on-all-memory-types.patch
mm-mprotect-use-pmd_trans_unstable-instead-of-taking-the-pmd_lock.patch
userfaultfd-mcopy_atomic-return-enoent-when-no-compatible-vma-found-fix-2.patch
userfaultfd-mcopy_atomic-return-enoent-when-no-compatible-vma-found-fix-2-fix-fix.patch
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