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init: Deal with the init process being a user mode process

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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.

Link: https://lkml.kernel.org/r/20220506141512.516114-5-ebiederm@xmission.com
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2022-04-11 09:58:26 -05:00
parent 5bd2e97c86
commit 68d85f0a33
1 changed files with 2 additions and 0 deletions
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2
init/initramfs.c
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@ -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);