From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> Subject: mm/shmem.c: zero out unused vma fields in shmem_pseudo_vma_init() 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. Link: http://lkml.kernel.org/r/20180531135602.20321-1-kirill.shutemov@xxxxxxxxxxxxxxx Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Hugh Dickins <hughd@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/shmem.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff -puN mm/shmem.c~mm-shmem-zero-out-unused-vma-fields-in-shmem_pseudo_vma_init mm/shmem.c --- a/mm/shmem.c~mm-shmem-zero-out-unused-vma-fields-in-shmem_pseudo_vma_init +++ a/mm/shmem.c @@ -1420,10 +1420,9 @@ static void shmem_pseudo_vma_init(struct 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); } _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
