[v3,15/17] vfs: Check for the IOP_XATTR flag in listxattr
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Message ID 1464598653-3656-16-git-send-email-agruenba@redhat.com
State New
Headers show

Commit Message

Andreas Gruenbacher May 30, 2016, 8:57 a.m. UTC
When an inode doesn't support xattrs, turn listxattr off as well.

(When xattrs are "turned off", the VFS still passes security xattr
operations through to security modules, which can still expose inode
security labels that way.)

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
 fs/xattr.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

Patch
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diff --git a/fs/xattr.c b/fs/xattr.c
index a947cb5..8ffc93e 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -319,18 +319,19 @@  nolsm:
 EXPORT_SYMBOL_GPL(vfs_getxattr);
 
 ssize_t
-vfs_listxattr(struct dentry *d, char *list, size_t size)
+vfs_listxattr(struct dentry *dentry, char *list, size_t size)
 {
+	struct inode *inode = d_inode(dentry);
 	ssize_t error;
 
-	error = security_inode_listxattr(d);
+	error = security_inode_listxattr(dentry);
 	if (error)
 		return error;
-	error = -EOPNOTSUPP;
-	if (d->d_inode->i_op->listxattr) {
-		error = d->d_inode->i_op->listxattr(d, list, size);
+	if (inode->i_op->listxattr && (inode->i_opflags & IOP_XATTR)) {
+		error = -EOPNOTSUPP;
+		error = inode->i_op->listxattr(dentry, list, size);
 	} else {
-		error = security_inode_listsecurity(d->d_inode, list, size);
+		error = security_inode_listsecurity(inode, list, size);
 		if (size && error > size)
 			error = -ERANGE;
 	}