Okay, so I need to classify this bug report related to QEMU into one of the given categories. Let me read through the problem description carefully. The issue is that QEMU defaults to using /var/tmp instead of /tmp for temporary files. The user points out that their sysadmins don't allow normal users to write to /var/tmp, which causes problems. They want an option to configure where QEMU uses for temp files, possibly via an environment variable or a ./configure option. Looking at the categories provided: mistranslation, assembly, other, device, graphic, socket, network, KVM, boot, vnc, debug, files, permissions, performance, kernel, peripherals, hypervisor. I need to figure out which category best fits this bug. The problem is about where QEMU writes temporary files. This relates to file handling and directory permissions. So it's not directly about translation or assembly. It's more about how the system handles files and directories. The possible categories include 'files' and 'permissions'. Since the issue is about access rights (sysadmins have set restrictions on /var/tmp), it touches on permissions, but the main problem is that QEMU isn't using the desired directory at all. The user wants to change where QEMU writes temp files, which is more about file handling. Wait, but 'files' might not cover the permission aspect. Alternatively, maybe 'permissions' because it's about access rights. But the primary issue is the default directory selection by QEMU, so perhaps 'files' is more appropriate since it's about how QEMU manages its temporary files location. Another angle: The bug report suggests that QEMU changes the temp directory without allowing the user to configure it. This seems like a configuration or runtime option problem, which falls under 'files' because it's about file paths and directories. So I think the best category here is 'files'. The issue revolves around QEMU's default temporary directory choice and the inability to configure it, which affects file handling and permissions. The primary concern is the location of temp files, making 'files' the appropriate category. files