[PATCH v13 06/23] fsverity: don't allow setting DAX file attribute on fsverity files

Andrey Albershteyn <[email protected]> Tue, 21 Jul 2026 20:40:43 +0200

Newsgroups	dev.linux.lists.fsverity,net.sourceforge.lists.linux-f2fs-devel,org.kernel.vger.linux-btrfs,org.kernel.vger.linux-ext4,org.kernel.vger.linux-fsdevel,org.kernel.vger.linux-xfs
Message-ID	<[email protected]>

When fsverity is enabled on the file, with FS_IOC_ENABLE_VERITY ioctl(),
it checks if file has DAX enabled and fails if that's true. However, the
opposite case is not checked.

Signed-off-by: Andrey Albershteyn <[email protected]>
---
 fs/file_attr.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/file_attr.c b/fs/file_attr.c
index bfb00d256dd5..5424ec4e3949 100644
--- a/fs/file_attr.c
+++ b/fs/file_attr.c
@@ -246,6 +246,11 @@ static int fileattr_set_prepare(struct inode *inode,
 	if (fa->fsx_cowextsize == 0)
 		fa->fsx_xflags &= ~FS_XFLAG_COWEXTSIZE;
 
+	/* Can not enable DAX on fsverity file */
+	if ((old_ma->fsx_xflags & FS_XFLAG_VERITY) &&
+			fa->fsx_xflags & FS_XFLAG_DAX)
+		return -EINVAL;
+
 	return 0;
 }
 
-- 
2.54.0