mirror of
https://github.com/linux-msm/laptops-kernel.git
synced 2026-08-13 14:19:53 -07:00
Christian Brauner
9a8e296958
Change userspace_init_fs from a declared-but-unused extern struct to a dynamically initialized pointer. Add init_userspace_fs() which is called early in kernel_init() (PID 1) to record PID 1's fs_struct as the canonical userspace filesystem state. Wire up __override_init_fs() and __revert_init_fs() to actually swap current->fs to/from userspace_init_fs. Previously these were no-ops that stored current->fs back to itself. Fix nullfs_userspace_init() to compare against userspace_init_fs instead of &init_fs. When PID 1 unshares its filesystem state, revert userspace_init_fs to init_fs's root (nullfs) so that stale filesystem state is not silently inherited by kworkers and usermodehelpers. At this stage PID 1's fs still points to rootfs (set by init_mount_tree), so userspace_init_fs points to rootfs and scoped_with_init_fs() is functionally equivalent to its previous no-op behavior. Link: https://patch.msgid.link/20260601-work-kthread-nullfs-v4-5-77ee053060e0@kernel.org Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
44 lines
1.1 KiB
C
44 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX__INIT_TASK_H
|
|
#define _LINUX__INIT_TASK_H
|
|
|
|
#include <linux/rcupdate.h>
|
|
#include <linux/irqflags.h>
|
|
#include <linux/utsname.h>
|
|
#include <linux/lockdep.h>
|
|
#include <linux/ftrace.h>
|
|
#include <linux/ipc.h>
|
|
#include <linux/pid_namespace.h>
|
|
#include <linux/user_namespace.h>
|
|
#include <linux/securebits.h>
|
|
#include <linux/seqlock.h>
|
|
#include <linux/rbtree.h>
|
|
#include <linux/refcount.h>
|
|
#include <linux/sched/autogroup.h>
|
|
#include <net/net_namespace.h>
|
|
#include <linux/sched/rt.h>
|
|
#include <linux/livepatch.h>
|
|
#include <linux/mm_types.h>
|
|
|
|
#include <asm/thread_info.h>
|
|
|
|
extern struct files_struct init_files;
|
|
extern struct fs_struct init_fs;
|
|
extern struct fs_struct *userspace_init_fs;
|
|
extern struct nsproxy init_nsproxy;
|
|
|
|
#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
|
|
#define INIT_PREV_CPUTIME(x) .prev_cputime = { \
|
|
.lock = __RAW_SPIN_LOCK_UNLOCKED(x.prev_cputime.lock), \
|
|
},
|
|
#else
|
|
#define INIT_PREV_CPUTIME(x)
|
|
#endif
|
|
|
|
#define INIT_TASK_COMM "swapper"
|
|
|
|
/* Attach to the thread_info data structure for proper alignment */
|
|
#define __init_thread_info __section(".data..init_thread_info")
|
|
|
|
#endif
|