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-rw-r--r--mm/secretmem.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/mm/secretmem.c b/mm/secretmem.c
index 098638d3b8a4..3b3cf2892b6a 100644
--- a/mm/secretmem.c
+++ b/mm/secretmem.c
@@ -158,6 +158,22 @@ const struct address_space_operations secretmem_aops = {
.isolate_page = secretmem_isolate_page,
};
+static int secretmem_setattr(struct user_namespace *mnt_userns,
+ struct dentry *dentry, struct iattr *iattr)
+{
+ struct inode *inode = d_inode(dentry);
+ unsigned int ia_valid = iattr->ia_valid;
+
+ if ((ia_valid & ATTR_SIZE) && inode->i_size)
+ return -EINVAL;
+
+ return simple_setattr(mnt_userns, dentry, iattr);
+}
+
+static const struct inode_operations secretmem_iops = {
+ .setattr = secretmem_setattr,
+};
+
static struct vfsmount *secretmem_mnt;
static struct file *secretmem_file_create(unsigned long flags)
@@ -177,6 +193,7 @@ static struct file *secretmem_file_create(unsigned long flags)
mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER);
mapping_set_unevictable(inode->i_mapping);
+ inode->i_op = &secretmem_iops;
inode->i_mapping->a_ops = &secretmem_aops;
/* pretend we are a normal file with zero size */