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ed4b167252Add a umh field to struct kernel_clone_args. When set, copy_fs() copies from pid 1's fs_struct instead of the kthread's fs_struct. This ensures usermodehelper threads always get init's filesystem state regardless of their parent's (kthreadd's) fs. Usermodehelper threads are not allowed to create mount namespaces (CLONE_NEWNS), share filesystem state (CLONE_FS), or be started from a non-initial mount namespace. No usermodehelper currently does this so we don't need to worry about this restriction. Set .umh = 1 in user_mode_thread(). At this stage pid 1's fs points to rootfs which is the same as kthreadd's fs, so this is functionally equivalent. Link: https://patch.msgid.link/20260601-work-kthread-nullfs-v4-20-77ee053060e0@kernel.org Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
568 lines
15 KiB
568 lines
15 KiB