From: Xiubo Li <xiubli@redhat.com>
Date: Mon, 13 Feb 2023 13:56:20 +0800
Subject: ceph: update the time stamps and try to drop the suid/sgid
Git-commit: e027253c4b77d395798600a90b6a96fe4adf4d5e
Patch-mainline: v6.3-rc1
References: bsc#1209504

The fallocate will try to clear the suid/sgid if a unprevileged user
changed the file.

There is no POSIX item requires that we should clear the suid/sgid
in fallocate code path but this is the default behaviour for most of
the filesystems and the VFS layer. And also the same for the write
code path, which have already support it.

And also we need to update the time stamps since the fallocate will
change the file contents.

Cc: stable@vger.kernel.org
Link: https://tracker.ceph.com/issues/58054
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Acked-by: Luis Henriques <lhenriques@suse.com>

---
 fs/ceph/file.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -2084,6 +2084,9 @@ static long ceph_fallocate(struct file *
 	loff_t endoff = 0;
 	loff_t size;
 
+	dout("%s %p %llx.%llx mode %x, offset %llu length %llu\n", __func__,
+	     inode, ceph_vinop(inode), mode, offset, length);
+
 	if (mode != (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
 		return -EOPNOTSUPP;
 
@@ -2124,6 +2127,10 @@ static long ceph_fallocate(struct file *
 	if (ret < 0)
 		goto unlock;
 
+	ret = file_modified(file);
+	if (ret)
+		goto put_caps;
+
 	filemap_invalidate_lock(inode->i_mapping);
 	ceph_zero_pagecache_range(inode, offset, length);
 	ret = ceph_zero_objects(inode, offset, length);
@@ -2139,6 +2146,7 @@ static long ceph_fallocate(struct file *
 	}
 	filemap_invalidate_unlock(inode->i_mapping);
 
+put_caps:
 	ceph_put_cap_refs(ci, got);
 unlock:
 	inode_unlock(inode);