Messages in this thread Patch in this message | | | From | "Kirill A. Shutemov" <> | Subject | [PATCHv2 03/14] mm/shmem: Zero out unused vma fields in shmem_pseudo_vma_init() | Date | Wed, 28 Mar 2018 19:55:29 +0300 |
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shmem/tmpfs uses pseudo vma to allocate page with correct NUMA policy.
The pseudo vma doesn't have vm_page_prot set. We are going to encode encryption KeyID in vm_page_prot. Having garbage there causes problems.
Zero out all unused fields in the pseudo vma.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> --- mm/shmem.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/mm/shmem.c b/mm/shmem.c index b85919243399..387b89d9e17a 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1404,10 +1404,9 @@ static void shmem_pseudo_vma_init(struct vm_area_struct *vma, struct shmem_inode_info *info, pgoff_t index) { /* Create a pseudo vma that just contains the policy */ - vma->vm_start = 0; + memset(vma, 0, sizeof(*vma)); /* Bias interleave by inode number to distribute better across nodes */ vma->vm_pgoff = index + info->vfs_inode.i_ino; - vma->vm_ops = NULL; vma->vm_policy = mpol_shared_policy_lookup(&info->policy, index); } -- 2.16.2
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