debugfs: make debugfs_create_str() read-only

debugfs_create_str() supports replacing the backing string from userspace.
Concurrent writers can race and free the same old string twice.

All writable in-tree users have been converted to local file operations.
Remove the generic write support from debugfs_create_str(), and refuse to
create a file when the caller passes write permission bits.

This makes unsupported writable use visible instead of silently creating a
file with different permissions.

Fixes: 86b5488121db ("debugfs: Add write support to debugfs_create_str()")
Signed-off-by: Yichong Chen <chenyichong@uniontech.com>
Link: https://patch.msgid.link/20260807100053.1089834-4-chenyichong@uniontech.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

0 files changed, 0 insertions, 0 deletions