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fs: add FS_XFLAG_VERITY for fs-verity files

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fs-verity introduced inode flag for inodes with enabled fs-verity on
them. This patch adds FS_XFLAG_VERITY file attribute which can be
retrieved with FS_IOC_FSGETXATTR ioctl() and file_getattr() syscall.

This flag is read-only and can not be set with corresponding set ioctl()
and file_setattr(). The FS_IOC_SETFLAGS requires file to be opened for
writing which is not allowed for verity files. The FS_IOC_FSSETXATTR and
file_setattr() clears this flag from the user input.

As this is now common flag for both flag interfaces (flags/xflags) add
it to overlapping flags list to exclude it from overwrite.

Signed-off-by: Andrey Albershteyn <aalbersh@kernel.org>
Link: https://patch.msgid.link/20260126115658.27656-2-aalbersh@kernel.org
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Andrey Albershteyn 2026-01-26 12:56:57 +01:00 • committed by Christian Brauner
parent 40210c2b11
commit 0e6b7eae1f
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GPG key ID: 91C61BC06578DCA2
4 changed files with 24 additions and 3 deletions
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16
Documentation/filesystems/fsverity.rst
View file

@ -341,6 +341,22 @@ the file has fs-verity enabled. This can perform better than
FS_IOC_GETFLAGS and FS_IOC_MEASURE_VERITY because it doesn't require
opening the file, and opening verity files can be expensive.
FS_IOC_FSGETXATTR
-----------------
Since Linux v7.0, the FS_IOC_FSGETXATTR ioctl sets FS_XFLAG_VERITY (0x00020000)
in the returned flags when the file has verity enabled. Note that this attribute
cannot be set with FS_IOC_FSSETXATTR as enabling verity requires input
parameters. See FS_IOC_ENABLE_VERITY.
file_getattr
------------
Since Linux v7.0, the file_getattr() syscall sets FS_XFLAG_VERITY (0x00020000)
in the returned flags when the file has verity enabled. Note that this attribute
cannot be set with file_setattr() as enabling verity requires input parameters.
See FS_IOC_ENABLE_VERITY.
.. _accessing_verity_files:
Accessing verity files

4
fs/file_attr.c
View file

@ -36,6 +36,8 @@ void fileattr_fill_xflags(struct file_kattr *fa, u32 xflags)
fa->flags |= FS_DAX_FL;
if (fa->fsx_xflags & FS_XFLAG_PROJINHERIT)
fa->flags |= FS_PROJINHERIT_FL;
if (fa->fsx_xflags & FS_XFLAG_VERITY)
fa->flags |= FS_VERITY_FL;
}
EXPORT_SYMBOL(fileattr_fill_xflags);
@ -66,6 +68,8 @@ void fileattr_fill_flags(struct file_kattr *fa, u32 flags)
fa->fsx_xflags |= FS_XFLAG_DAX;
if (fa->flags & FS_PROJINHERIT_FL)
fa->fsx_xflags |= FS_XFLAG_PROJINHERIT;
if (fa->flags & FS_VERITY_FL)
fa->fsx_xflags |= FS_XFLAG_VERITY;
}
EXPORT_SYMBOL(fileattr_fill_flags);

6
include/linux/fileattr.h
View file

@ -7,16 +7,16 @@
#define FS_COMMON_FL \
(FS_SYNC_FL | FS_IMMUTABLE_FL | FS_APPEND_FL | \
FS_NODUMP_FL | FS_NOATIME_FL | FS_DAX_FL | \
FS_PROJINHERIT_FL)
FS_PROJINHERIT_FL | FS_VERITY_FL)
#define FS_XFLAG_COMMON \
(FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | FS_XFLAG_APPEND | \
FS_XFLAG_NODUMP | FS_XFLAG_NOATIME | FS_XFLAG_DAX | \
FS_XFLAG_PROJINHERIT)
FS_XFLAG_PROJINHERIT | FS_XFLAG_VERITY)
/* Read-only inode flags */
#define FS_XFLAG_RDONLY_MASK \
(FS_XFLAG_PREALLOC | FS_XFLAG_HASATTR)
(FS_XFLAG_PREALLOC | FS_XFLAG_HASATTR | FS_XFLAG_VERITY)
/* Flags to indicate valid value of fsx_ fields */
#define FS_XFLAG_VALUES_MASK \

1
include/uapi/linux/fs.h
View file

@ -253,6 +253,7 @@ struct file_attr {
#define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */
#define FS_XFLAG_DAX 0x00008000 /* use DAX for IO */
#define FS_XFLAG_COWEXTSIZE 0x00010000 /* CoW extent size allocator hint */
#define FS_XFLAG_VERITY 0x00020000 /* fs-verity enabled */
#define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */
/* the read-only stuff doesn't really belong here, but any other place is