linux-kernel - [PATCH 5.10 224/299] fs: fix reporting supported extra file attributes for statx()

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Date:   Mon, 10 May 2021 12:20:21 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, stable@...nel.org,
        Theodore Tso <tytso@....edu>
Subject: [PATCH 5.10 224/299] fs: fix reporting supported extra file attributes for statx()

From: Theodore Ts'o <tytso@....edu>

commit 5afa7e8b70d65819245fece61a65fd753b4aae33 upstream.

statx(2) notes that any attribute that is not indicated as supported
by stx_attributes_mask has no usable value.  Commits 801e523796004
("fs: move generic stat response attr handling to vfs_getattr_nosec")
and 712b2698e4c02 ("fs/stat: Define DAX statx attribute") sets
STATX_ATTR_AUTOMOUNT and STATX_ATTR_DAX, respectively, without setting
stx_attributes_mask, which can cause xfstests generic/532 to fail.

Fix this in the same way as commit 1b9598c8fb99 ("xfs: fix reporting
supported extra file attributes for statx()")

Fixes: 801e523796004 ("fs: move generic stat response attr handling to vfs_getattr_nosec")
Fixes: 712b2698e4c02 ("fs/stat: Define DAX statx attribute")
Cc: stable@...nel.org
Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/stat.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/fs/stat.c
+++ b/fs/stat.c
@@ -77,12 +77,20 @@ int vfs_getattr_nosec(const struct path
 	/* SB_NOATIME means filesystem supplies dummy atime value */
 	if (inode->i_sb->s_flags & SB_NOATIME)
 		stat->result_mask &= ~STATX_ATIME;
+
+	/*
+	 * Note: If you add another clause to set an attribute flag, please
+	 * update attributes_mask below.
+	 */
 	if (IS_AUTOMOUNT(inode))
 		stat->attributes |= STATX_ATTR_AUTOMOUNT;
 
 	if (IS_DAX(inode))
 		stat->attributes |= STATX_ATTR_DAX;
 
+	stat->attributes_mask |= (STATX_ATTR_AUTOMOUNT |
+				  STATX_ATTR_DAX);
+
 	if (inode->i_op->getattr)
 		return inode->i_op->getattr(path, stat, request_mask,
 					    query_flags);