fhandle: do_handle_open() should get FD with user flags

JIRA: https://issues.redhat.com/browse/RHEL-107520

commit b5ca889
Author: Thomas Bertschinger <tahbertschinger@gmail.com>
Date:   Thu, 14 Aug 2025 17:54:28 -0600

    fhandle: do_handle_open() should get FD with user flags

    In f07c7cc, do_handle_open() was switched to use the automatic
    cleanup method for getting a FD. In that change it was also switched
    to pass O_CLOEXEC unconditionally to get_unused_fd_flags() instead
    of passing the user-specified flags.

    I don't see anything in that commit description that indicates this was
    intentional, so I am assuming it was an oversight.

    With this fix, the FD will again be opened with, or without, O_CLOEXEC
    according to what the user requested.

    Fixes: f07c7cc ("fhandle: simplify error handling")
    Signed-off-by: Thomas Bertschinger <tahbertschinger@gmail.com>
    Link: https://lore.kernel.org/20250814235431.995876-4-tahbertschinger@gmail.com
    Reviewed-by: Amir Goldstein <amir73il@gmail.com>
    Signed-off-by: Christian Brauner <brauner@kernel.org>

Signed-off-by: Waiman Long <longman@redhat.com>

Author: Waiman-Long

fs/fhandle.c

@@ -325,7 +325,7 @@ static long do_handle_open(int mountdirfd, struct file_handle __user *ufh,
 	if (retval)
 		return retval;
 
-	CLASS(get_unused_fd, fd)(O_CLOEXEC);
+	CLASS(get_unused_fd, fd)(open_flag);
 	if (fd < 0)
 		return fd;