It is silly for user_mode_thread to leave PF_KTHREAD set on the resulting task. Update the init process so that it does not care if PF_KTHREAD is set or not. Ensure do_populate_rootfs flushes all delayed fput work by calling task_work_run. In the rare instance that async_schedule_domain calls do_populate_rootfs synchronously it is possible do_populate_rootfs will be called directly from the init process. At which point fput will call "task_work_add(current, ..., TWA_RESUME)". The files on the initramfs need to be completely put before we attempt to exec them (which is before the code enters userspace). So call task_work_run just in case there are any pending fput operations. Signed-off-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx> --- init/initramfs.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/init/initramfs.c b/init/initramfs.c index 2f3d96dc3db6..41e7857d510d 100644 --- a/init/initramfs.c +++ b/init/initramfs.c @@ -15,6 +15,7 @@ #include <linux/mm.h> #include <linux/namei.h> #include <linux/init_syscalls.h> +#include <linux/task_work.h> #include <linux/umh.h> static ssize_t __init xwrite(struct file *file, const char *p, size_t count, @@ -703,6 +704,7 @@ static void __init do_populate_rootfs(void *unused, async_cookie_t cookie) initrd_end = 0; flush_delayed_fput(); + task_work_run(); } static ASYNC_DOMAIN_EXCLUSIVE(initramfs_domain); -- 2.35.3
