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Zilin Guan
fbab8c08e1
[ Upstream commit90f601b497] bm_register_write() opens an executable file using open_exec(), which internally calls do_open_execat() and denies write access on the file to avoid modification while it is being executed. However, when an error occurs, bm_register_write() closes the file using filp_close() directly. This does not restore the write permission, which may cause subsequent write operations on the same file to fail. Fix this by calling exe_file_allow_write_access() before filp_close() to restore the write permission properly. Fixes:e7850f4d84("binfmt_misc: fix possible deadlock in bm_register_write") Signed-off-by: Zilin Guan <zilin@seu.edu.cn> Link: https://patch.msgid.link/20251105022923.1813587-1-zilin@seu.edu.cn Signed-off-by: Christian Brauner <brauner@kernel.org> [ Use allow_write_access() instead of exe_file_allow_write_access() according to commit0357ef03c9("fs: don't block write during exec on pre-content watched files"). ] Signed-off-by: Robert Garcia <rob_garcia@163.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>