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| author | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-12-03 07:54:31 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-12-03 07:54:31 +0100 |
| commit | 7782b57ccc60534d6edd21f6b2bbdc4fda777fdf (patch) | |
| tree | 2d5415984048f476675f21226bb00dd0023ca5e9 /fs/userfaultfd.c | |
| parent | f88184bfee48d482dfff04cd1eed6906f289db4a (diff) | |
| parent | 2595646791c319cadfdbf271563aac97d0843dc7 (diff) | |
Merge 4.20-rc5 into driver-core-next
We need the fixes in here as well.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/userfaultfd.c')
| -rw-r--r-- | fs/userfaultfd.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index 356d2b8568c1..cd58939dc977 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -1361,6 +1361,19 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx, ret = -EINVAL; if (!vma_can_userfault(cur)) goto out_unlock; + + /* + * UFFDIO_COPY will fill file holes even without + * PROT_WRITE. This check enforces that if this is a + * MAP_SHARED, the process has write permission to the backing + * file. If VM_MAYWRITE is set it also enforces that on a + * MAP_SHARED vma: there is no F_WRITE_SEAL and no further + * F_WRITE_SEAL can be taken until the vma is destroyed. + */ + ret = -EPERM; + if (unlikely(!(cur->vm_flags & VM_MAYWRITE))) + goto out_unlock; + /* * If this vma contains ending address, and huge pages * check alignment. @@ -1406,6 +1419,7 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx, BUG_ON(!vma_can_userfault(vma)); BUG_ON(vma->vm_userfaultfd_ctx.ctx && vma->vm_userfaultfd_ctx.ctx != ctx); + WARN_ON(!(vma->vm_flags & VM_MAYWRITE)); /* * Nothing to do: this vma is already registered into this @@ -1552,6 +1566,7 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx, cond_resched(); BUG_ON(!vma_can_userfault(vma)); + WARN_ON(!(vma->vm_flags & VM_MAYWRITE)); /* * Nothing to do: this vma is already registered into this |