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| author | Eric W. Biederman <ebiederm@xmission.com> | 2022-04-11 09:58:26 -0500 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2022-05-07 09:01:59 -0500 |
| commit | 68d85f0a33b0cbfe4921485160ff75ea7a081215 (patch) | |
| tree | f9ffafb6c1f77ebb3f239766ddd1a1e99f418aa3 /init | |
| parent | 5bd2e97c868a8a44470950ed01846cab6328e540 (diff) | |
| download | linux-rpi-68d85f0a33b0cbfe4921485160ff75ea7a081215.tar.gz linux-rpi-68d85f0a33b0cbfe4921485160ff75ea7a081215.tar.bz2 linux-rpi-68d85f0a33b0cbfe4921485160ff75ea7a081215.zip | |
init: Deal with the init process being a user mode process
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>
Diffstat (limited to 'init')
| -rw-r--r-- | init/initramfs.c | 2 |
1 files changed, 2 insertions, 0 deletions
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 @@ done: initrd_end = 0; flush_delayed_fput(); + task_work_run(); } static ASYNC_DOMAIN_EXCLUSIVE(initramfs_domain); |