Contributors: 174
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Masami Hiramatsu |
1038 |
18.98% |
26 |
5.21% |
| Linus Torvalds (pre-git) |
512 |
9.36% |
69 |
13.83% |
| Andrew Morton |
374 |
6.84% |
34 |
6.81% |
| Steven Rostedt |
359 |
6.57% |
14 |
2.81% |
| Rusty Russell |
358 |
6.55% |
17 |
3.41% |
| Prarit Bhargava |
228 |
4.17% |
2 |
0.40% |
| Andrew Halaney |
217 |
3.97% |
2 |
0.40% |
| Kees Cook |
128 |
2.34% |
2 |
0.40% |
| Pawel Moll |
115 |
2.10% |
1 |
0.20% |
| Mike Rapoport |
102 |
1.87% |
10 |
2.00% |
| Arvind Sankar |
99 |
1.81% |
3 |
0.60% |
| Linus Torvalds |
94 |
1.72% |
19 |
3.81% |
| Thomas Gleixner |
74 |
1.35% |
14 |
2.81% |
| Alon Bar-Lev |
69 |
1.26% |
1 |
0.20% |
| Michael Opdenacker |
66 |
1.21% |
1 |
0.20% |
| Ingo Molnar |
60 |
1.10% |
16 |
3.21% |
| Rasmus Villemoes |
55 |
1.01% |
5 |
1.00% |
| Al Viro |
49 |
0.90% |
3 |
0.60% |
| Mark Rutland |
48 |
0.88% |
2 |
0.40% |
| Olof Johansson |
47 |
0.86% |
1 |
0.20% |
| Vivek Goyal |
43 |
0.79% |
2 |
0.40% |
| Christoph Hellwig |
42 |
0.77% |
9 |
1.80% |
| Peter Zijlstra |
41 |
0.75% |
8 |
1.60% |
| Peter Oberparleiter |
41 |
0.75% |
1 |
0.20% |
| Huang Shijie |
40 |
0.73% |
1 |
0.20% |
| Eric W. Biedermann |
38 |
0.69% |
7 |
1.40% |
| Christophe Leroy |
36 |
0.66% |
4 |
0.80% |
| Yinghai Lu |
35 |
0.64% |
3 |
0.60% |
| Chris Down |
29 |
0.53% |
1 |
0.20% |
| Cyrill V. Gorcunov |
28 |
0.51% |
2 |
0.40% |
| Tejun Heo |
27 |
0.49% |
5 |
1.00% |
| Frédéric Weisbecker |
26 |
0.48% |
7 |
1.40% |
| matthias.kunze@gmx-topmail.de |
26 |
0.48% |
1 |
0.20% |
| Eduard - Gabriel Munteanu |
25 |
0.46% |
2 |
0.40% |
| Geert Uytterhoeven |
24 |
0.44% |
4 |
0.80% |
| Dominik Brodowski |
23 |
0.42% |
2 |
0.40% |
| Jim Cromie |
23 |
0.42% |
2 |
0.40% |
| Yuntao Wang |
23 |
0.42% |
3 |
0.60% |
| Luis R. Rodriguez |
20 |
0.37% |
1 |
0.20% |
| Len Brown |
20 |
0.37% |
4 |
0.80% |
| Magnus Damm |
20 |
0.37% |
1 |
0.20% |
| Alexander Sverdlin |
19 |
0.35% |
1 |
0.20% |
| Nadav Amit |
18 |
0.33% |
2 |
0.40% |
| Dmitry Torokhov |
18 |
0.33% |
1 |
0.20% |
| David Howells |
18 |
0.33% |
5 |
1.00% |
| Andi Kleen |
17 |
0.31% |
5 |
1.00% |
| Alexey Dobriyan |
17 |
0.31% |
4 |
0.80% |
| Jason A. Donenfeld |
16 |
0.29% |
3 |
0.60% |
| Mike Travis |
16 |
0.29% |
2 |
0.40% |
| Paul E. McKenney |
16 |
0.29% |
5 |
1.00% |
| Adrian Bunk |
16 |
0.29% |
4 |
0.80% |
| Arjan van de Ven |
16 |
0.29% |
4 |
0.80% |
| AKASHI Takahiro |
15 |
0.27% |
1 |
0.20% |
| Chris Metcalf |
15 |
0.27% |
1 |
0.20% |
| Nadia Yvette Chambers |
15 |
0.27% |
1 |
0.20% |
| Kevin Winchester |
15 |
0.27% |
2 |
0.40% |
| H Hartley Sweeten |
14 |
0.26% |
1 |
0.20% |
| Randy Dunlap |
12 |
0.22% |
1 |
0.20% |
| Johannes Berg |
12 |
0.22% |
1 |
0.20% |
| Nick Desaulniers |
12 |
0.22% |
2 |
0.40% |
| Krister Johansen |
11 |
0.20% |
1 |
0.20% |
| Shailabh Nagar |
11 |
0.20% |
2 |
0.40% |
| Hannes Frederic Sowa |
9 |
0.16% |
1 |
0.20% |
| Ard van Breemen |
9 |
0.16% |
1 |
0.20% |
| Alexander Potapenko |
9 |
0.16% |
3 |
0.60% |
| Benjamin Herrenschmidt |
9 |
0.16% |
2 |
0.40% |
| Ard Biesheuvel |
9 |
0.16% |
1 |
0.20% |
| Pavel Emelyanov |
8 |
0.15% |
1 |
0.20% |
| Mark-PK Tsai |
8 |
0.15% |
1 |
0.20% |
| Krzysztof Mazur |
8 |
0.15% |
1 |
0.20% |
| Paul Menage |
8 |
0.15% |
1 |
0.20% |
| Jinbum Park |
8 |
0.15% |
1 |
0.20% |
| Pekka J Enberg |
8 |
0.15% |
3 |
0.60% |
| Miao Xie |
8 |
0.15% |
2 |
0.40% |
| Fabian Frederick |
7 |
0.13% |
2 |
0.40% |
| Greg Kroah-Hartman |
7 |
0.13% |
3 |
0.60% |
| Dmitry Kasatkin |
7 |
0.13% |
1 |
0.20% |
| Paul Menzel |
7 |
0.13% |
1 |
0.20% |
| John Stultz |
7 |
0.13% |
2 |
0.40% |
| Arnaldo Carvalho de Melo |
7 |
0.13% |
1 |
0.20% |
| Marco Elver |
7 |
0.13% |
2 |
0.40% |
| Jason Wessel |
6 |
0.11% |
2 |
0.40% |
| Jeff Dike |
6 |
0.11% |
1 |
0.20% |
| Brendan Higgins |
6 |
0.11% |
2 |
0.40% |
| Dipankar Sarma |
6 |
0.11% |
1 |
0.20% |
| Yaowei Bai |
6 |
0.11% |
1 |
0.20% |
| Aaron Tomlin |
6 |
0.11% |
1 |
0.20% |
| Brian Avery |
6 |
0.11% |
1 |
0.20% |
| Christian Brauner |
6 |
0.11% |
1 |
0.20% |
| Chris Zankel |
6 |
0.11% |
1 |
0.20% |
| Paul Jackson |
5 |
0.09% |
1 |
0.20% |
| Laura Abbott |
5 |
0.09% |
2 |
0.40% |
| Josh Poimboeuf |
5 |
0.09% |
3 |
0.60% |
| Borislav Petkov |
5 |
0.09% |
2 |
0.40% |
| Américo Wang |
5 |
0.09% |
1 |
0.20% |
| John Levon |
5 |
0.09% |
2 |
0.40% |
| Stephen Boyd |
5 |
0.09% |
2 |
0.40% |
| Heiko Carstens |
5 |
0.09% |
1 |
0.20% |
| Dan J Williams |
4 |
0.07% |
1 |
0.20% |
| Daniel R Thompson |
4 |
0.07% |
1 |
0.20% |
| Pavel Tatashin |
4 |
0.07% |
2 |
0.40% |
| Lai Jiangshan |
4 |
0.07% |
2 |
0.40% |
| Tetsuo Handa |
4 |
0.07% |
1 |
0.20% |
| Tal Shorer |
4 |
0.07% |
1 |
0.20% |
| Stas Sergeev |
4 |
0.07% |
1 |
0.20% |
| Joerg Roedel |
4 |
0.07% |
1 |
0.20% |
| Geliang Tang |
4 |
0.07% |
1 |
0.20% |
| Mel Gorman |
4 |
0.07% |
2 |
0.40% |
| Sukadev Bhattiprolu |
3 |
0.05% |
2 |
0.40% |
| Dou Liyang |
3 |
0.05% |
1 |
0.20% |
| Steven Price |
3 |
0.05% |
1 |
0.20% |
| Patrick Mochel |
3 |
0.05% |
1 |
0.20% |
| Michal Hocko |
3 |
0.05% |
1 |
0.20% |
| George Anzinger |
3 |
0.05% |
1 |
0.20% |
| Steffen Klassert |
3 |
0.05% |
1 |
0.20% |
| Sumit Garg |
3 |
0.05% |
1 |
0.20% |
| Matthew Garrett |
3 |
0.05% |
1 |
0.20% |
| Alex Riesen |
3 |
0.05% |
2 |
0.40% |
| Jiri Olsa |
3 |
0.05% |
1 |
0.20% |
| Daniel Jordan |
3 |
0.05% |
1 |
0.20% |
| Nicholas Piggin |
3 |
0.05% |
2 |
0.40% |
| Liam R. Howlett |
3 |
0.05% |
1 |
0.20% |
| Uladzislau Rezki |
3 |
0.05% |
1 |
0.20% |
| Ruiqi Gong |
3 |
0.05% |
1 |
0.20% |
| Paul Gortmaker |
3 |
0.05% |
1 |
0.20% |
| Cao jin |
3 |
0.05% |
1 |
0.20% |
| Eric Dumazet |
3 |
0.05% |
1 |
0.20% |
| Andrew Lutomirski |
3 |
0.05% |
1 |
0.20% |
| Takao Indoh |
3 |
0.05% |
1 |
0.20% |
| Rafael J. Wysocki |
3 |
0.05% |
1 |
0.20% |
| Palmer Dabbelt |
3 |
0.05% |
1 |
0.20% |
| Lei Ming |
3 |
0.05% |
1 |
0.20% |
| Catalin Marinas |
3 |
0.05% |
1 |
0.20% |
| Vlastimil Babka |
3 |
0.05% |
1 |
0.20% |
| Prasanna S. Panchamukhi |
3 |
0.05% |
1 |
0.20% |
| Christoph Lameter |
3 |
0.05% |
1 |
0.20% |
| Andy Grover |
3 |
0.05% |
2 |
0.40% |
| Matt Fleming |
3 |
0.05% |
1 |
0.20% |
| Emese Revfy |
3 |
0.05% |
1 |
0.20% |
| Stéphane Eranian |
3 |
0.05% |
1 |
0.20% |
| Jeffrey Hugo |
2 |
0.04% |
1 |
0.20% |
| Michael Christie |
2 |
0.04% |
1 |
0.20% |
| Russell King |
2 |
0.04% |
1 |
0.20% |
| Adam Kropelin |
2 |
0.04% |
1 |
0.20% |
| Michal Schmidt |
2 |
0.04% |
1 |
0.20% |
| Li Zefan |
2 |
0.04% |
1 |
0.20% |
| Paolo 'Blaisorblade' Giarrusso |
2 |
0.04% |
1 |
0.20% |
| Vineet Gupta |
2 |
0.04% |
1 |
0.20% |
| Wolfram Sang |
2 |
0.04% |
1 |
0.20% |
| Sam Ravnborg |
2 |
0.04% |
1 |
0.20% |
| Changbin Du |
2 |
0.04% |
1 |
0.20% |
| Rakib Mullick |
2 |
0.04% |
1 |
0.20% |
| Santosh Shilimkar |
2 |
0.04% |
1 |
0.20% |
| Matt Mackall |
1 |
0.02% |
1 |
0.20% |
| Daniel Micay |
1 |
0.02% |
1 |
0.20% |
| Jiang Liu |
1 |
0.02% |
1 |
0.20% |
| Nico Pitre |
1 |
0.02% |
1 |
0.20% |
| Petr Mladek |
1 |
0.02% |
1 |
0.20% |
| Joel A Fernandes |
1 |
0.02% |
1 |
0.20% |
| Sakari Ailus |
1 |
0.02% |
1 |
0.20% |
| Jan Beulich |
1 |
0.02% |
1 |
0.20% |
| Jason Yan |
1 |
0.02% |
1 |
0.20% |
| Wang YanQing |
1 |
0.02% |
1 |
0.20% |
| Frans Klaver |
1 |
0.02% |
1 |
0.20% |
| Matthew Wilcox |
1 |
0.02% |
1 |
0.20% |
| Kefeng Wang |
1 |
0.02% |
1 |
0.20% |
| Mauro Carvalho Chehab |
1 |
0.02% |
1 |
0.20% |
| Heinrich Schuchardt |
1 |
0.02% |
1 |
0.20% |
| Andrey Konovalov |
1 |
0.02% |
1 |
0.20% |
| Gargi Sharma |
1 |
0.02% |
1 |
0.20% |
| JiSheng Zhang |
1 |
0.02% |
1 |
0.20% |
| Viresh Kumar |
1 |
0.02% |
1 |
0.20% |
| Shaokun Zhang |
1 |
0.02% |
1 |
0.20% |
| Chris Wright |
1 |
0.02% |
1 |
0.20% |
| Total |
5468 |
|
499 |
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/init/main.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*
* GK 2/5/95 - Changed to support mounting root fs via NFS
* Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96
* Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96
* Simplified starting of init: Michael A. Griffith <grif@acm.org>
*/
#define DEBUG /* Enable initcall_debug */
#include <linux/types.h>
#include <linux/extable.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/binfmts.h>
#include <linux/kernel.h>
#include <linux/syscalls.h>
#include <linux/stackprotector.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/initrd.h>
#include <linux/memblock.h>
#include <linux/acpi.h>
#include <linux/bootconfig.h>
#include <linux/console.h>
#include <linux/nmi.h>
#include <linux/percpu.h>
#include <linux/kmod.h>
#include <linux/kprobes.h>
#include <linux/kmsan.h>
#include <linux/vmalloc.h>
#include <linux/kernel_stat.h>
#include <linux/start_kernel.h>
#include <linux/security.h>
#include <linux/smp.h>
#include <linux/profile.h>
#include <linux/kfence.h>
#include <linux/rcupdate.h>
#include <linux/srcu.h>
#include <linux/moduleparam.h>
#include <linux/kallsyms.h>
#include <linux/buildid.h>
#include <linux/writeback.h>
#include <linux/cpu.h>
#include <linux/cpuset.h>
#include <linux/cgroup.h>
#include <linux/efi.h>
#include <linux/tick.h>
#include <linux/sched/isolation.h>
#include <linux/interrupt.h>
#include <linux/taskstats_kern.h>
#include <linux/delayacct.h>
#include <linux/unistd.h>
#include <linux/utsname.h>
#include <linux/rmap.h>
#include <linux/mempolicy.h>
#include <linux/key.h>
#include <linux/debug_locks.h>
#include <linux/debugobjects.h>
#include <linux/lockdep.h>
#include <linux/kmemleak.h>
#include <linux/padata.h>
#include <linux/pid_namespace.h>
#include <linux/device/driver.h>
#include <linux/kthread.h>
#include <linux/sched.h>
#include <linux/sched/init.h>
#include <linux/signal.h>
#include <linux/idr.h>
#include <linux/kgdb.h>
#include <linux/ftrace.h>
#include <linux/async.h>
#include <linux/shmem_fs.h>
#include <linux/slab.h>
#include <linux/perf_event.h>
#include <linux/ptrace.h>
#include <linux/pti.h>
#include <linux/blkdev.h>
#include <linux/sched/clock.h>
#include <linux/sched/task.h>
#include <linux/sched/task_stack.h>
#include <linux/context_tracking.h>
#include <linux/random.h>
#include <linux/moduleloader.h>
#include <linux/list.h>
#include <linux/integrity.h>
#include <linux/proc_ns.h>
#include <linux/io.h>
#include <linux/cache.h>
#include <linux/rodata_test.h>
#include <linux/jump_label.h>
#include <linux/kcsan.h>
#include <linux/init_syscalls.h>
#include <linux/stackdepot.h>
#include <linux/randomize_kstack.h>
#include <linux/pidfs.h>
#include <linux/ptdump.h>
#include <net/net_namespace.h>
#include <asm/io.h>
#include <asm/setup.h>
#include <asm/sections.h>
#include <asm/cacheflush.h>
#define CREATE_TRACE_POINTS
#include <trace/events/initcall.h>
#include <kunit/test.h>
static int kernel_init(void *);
/*
* Debug helper: via this flag we know that we are in 'early bootup code'
* where only the boot processor is running with IRQ disabled. This means
* two things - IRQ must not be enabled before the flag is cleared and some
* operations which are not allowed with IRQ disabled are allowed while the
* flag is set.
*/
bool early_boot_irqs_disabled __read_mostly;
enum system_states system_state __read_mostly;
EXPORT_SYMBOL(system_state);
/*
* Boot command-line arguments
*/
#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT
#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT
/* Default late time init is NULL. archs can override this later. */
void (*__initdata late_time_init)(void);
/* Untouched command line saved by arch-specific code. */
char __initdata boot_command_line[COMMAND_LINE_SIZE];
/* Untouched saved command line (eg. for /proc) */
char *saved_command_line __ro_after_init;
unsigned int saved_command_line_len __ro_after_init;
/* Command line for parameter parsing */
static char *static_command_line;
/* Untouched extra command line */
static char *extra_command_line;
/* Extra init arguments */
static char *extra_init_args;
#ifdef CONFIG_BOOT_CONFIG
/* Is bootconfig on command line? */
static bool bootconfig_found;
static size_t initargs_offs;
#else
# define bootconfig_found false
# define initargs_offs 0
#endif
static char *execute_command;
static char *ramdisk_execute_command = "/init";
/*
* Used to generate warnings if static_key manipulation functions are used
* before jump_label_init is called.
*/
bool static_key_initialized __read_mostly;
EXPORT_SYMBOL_GPL(static_key_initialized);
/*
* If set, this is an indication to the drivers that reset the underlying
* device before going ahead with the initialization otherwise driver might
* rely on the BIOS and skip the reset operation.
*
* This is useful if kernel is booting in an unreliable environment.
* For ex. kdump situation where previous kernel has crashed, BIOS has been
* skipped and devices will be in unknown state.
*/
unsigned int reset_devices;
EXPORT_SYMBOL(reset_devices);
static int __init set_reset_devices(char *str)
{
reset_devices = 1;
return 1;
}
__setup("reset_devices", set_reset_devices);
static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
static const char *panic_later, *panic_param;
static bool __init obsolete_checksetup(char *line)
{
const struct obs_kernel_param *p;
bool had_early_param = false;
p = __setup_start;
do {
int n = strlen(p->str);
if (parameqn(line, p->str, n)) {
if (p->early) {
/* Already done in parse_early_param?
* (Needs exact match on param part).
* Keep iterating, as we can have early
* params and __setups of same names 8( */
if (line[n] == '\0' || line[n] == '=')
had_early_param = true;
} else if (!p->setup_func) {
pr_warn("Parameter %s is obsolete, ignored\n",
p->str);
return true;
} else if (p->setup_func(line + n))
return true;
}
p++;
} while (p < __setup_end);
return had_early_param;
}
/*
* This should be approx 2 Bo*oMips to start (note initial shift), and will
* still work even if initially too large, it will just take slightly longer
*/
unsigned long loops_per_jiffy = (1<<12);
EXPORT_SYMBOL(loops_per_jiffy);
static int __init debug_kernel(char *str)
{
console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
return 0;
}
static int __init quiet_kernel(char *str)
{
console_loglevel = CONSOLE_LOGLEVEL_QUIET;
return 0;
}
early_param("debug", debug_kernel);
early_param("quiet", quiet_kernel);
static int __init loglevel(char *str)
{
int newlevel;
/*
* Only update loglevel value when a correct setting was passed,
* to prevent blind crashes (when loglevel being set to 0) that
* are quite hard to debug
*/
if (get_option(&str, &newlevel)) {
console_loglevel = newlevel;
return 0;
}
return -EINVAL;
}
early_param("loglevel", loglevel);
#ifdef CONFIG_BLK_DEV_INITRD
static void * __init get_boot_config_from_initrd(size_t *_size)
{
u32 size, csum;
char *data;
u32 *hdr;
int i;
if (!initrd_end)
return NULL;
data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN;
/*
* Since Grub may align the size of initrd to 4, we must
* check the preceding 3 bytes as well.
*/
for (i = 0; i < 4; i++) {
if (!memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN))
goto found;
data--;
}
return NULL;
found:
hdr = (u32 *)(data - 8);
size = le32_to_cpu(hdr[0]);
csum = le32_to_cpu(hdr[1]);
data = ((void *)hdr) - size;
if ((unsigned long)data < initrd_start) {
pr_err("bootconfig size %d is greater than initrd size %ld\n",
size, initrd_end - initrd_start);
return NULL;
}
if (xbc_calc_checksum(data, size) != csum) {
pr_err("bootconfig checksum failed\n");
return NULL;
}
/* Remove bootconfig from initramfs/initrd */
initrd_end = (unsigned long)data;
if (_size)
*_size = size;
return data;
}
#else
static void * __init get_boot_config_from_initrd(size_t *_size)
{
return NULL;
}
#endif
#ifdef CONFIG_BOOT_CONFIG
static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata;
#define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0)
static int __init xbc_snprint_cmdline(char *buf, size_t size,
struct xbc_node *root)
{
struct xbc_node *knode, *vnode;
char *end = buf + size;
const char *val, *q;
int ret;
xbc_node_for_each_key_value(root, knode, val) {
ret = xbc_node_compose_key_after(root, knode,
xbc_namebuf, XBC_KEYLEN_MAX);
if (ret < 0)
return ret;
vnode = xbc_node_get_child(knode);
if (!vnode) {
ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf);
if (ret < 0)
return ret;
buf += ret;
continue;
}
xbc_array_for_each_value(vnode, val) {
/*
* For prettier and more readable /proc/cmdline, only
* quote the value when necessary, i.e. when it contains
* whitespace.
*/
q = strpbrk(val, " \t\r\n") ? "\"" : "";
ret = snprintf(buf, rest(buf, end), "%s=%s%s%s ",
xbc_namebuf, q, val, q);
if (ret < 0)
return ret;
buf += ret;
}
}
return buf - (end - size);
}
#undef rest
/* Make an extra command line under given key word */
static char * __init xbc_make_cmdline(const char *key)
{
struct xbc_node *root;
char *new_cmdline;
int ret, len = 0;
root = xbc_find_node(key);
if (!root)
return NULL;
/* Count required buffer size */
len = xbc_snprint_cmdline(NULL, 0, root);
if (len <= 0)
return NULL;
new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES);
if (!new_cmdline) {
pr_err("Failed to allocate memory for extra kernel cmdline.\n");
return NULL;
}
ret = xbc_snprint_cmdline(new_cmdline, len + 1, root);
if (ret < 0 || ret > len) {
pr_err("Failed to print extra kernel cmdline.\n");
memblock_free(new_cmdline, len + 1);
return NULL;
}
return new_cmdline;
}
static int __init bootconfig_params(char *param, char *val,
const char *unused, void *arg)
{
if (strcmp(param, "bootconfig") == 0) {
bootconfig_found = true;
}
return 0;
}
static int __init warn_bootconfig(char *str)
{
/* The 'bootconfig' has been handled by bootconfig_params(). */
return 0;
}
static void __init setup_boot_config(void)
{
static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
const char *msg, *data;
int pos, ret;
size_t size;
char *err;
/* Cut out the bootconfig data even if we have no bootconfig option */
data = get_boot_config_from_initrd(&size);
/* If there is no bootconfig in initrd, try embedded one. */
if (!data)
data = xbc_get_embedded_bootconfig(&size);
strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL,
bootconfig_params);
if (IS_ERR(err) || !(bootconfig_found || IS_ENABLED(CONFIG_BOOT_CONFIG_FORCE)))
return;
/* parse_args() stops at the next param of '--' and returns an address */
if (err)
initargs_offs = err - tmp_cmdline;
if (!data) {
/* If user intended to use bootconfig, show an error level message */
if (bootconfig_found)
pr_err("'bootconfig' found on command line, but no bootconfig found\n");
else
pr_info("No bootconfig data provided, so skipping bootconfig");
return;
}
if (size >= XBC_DATA_MAX) {
pr_err("bootconfig size %ld greater than max size %d\n",
(long)size, XBC_DATA_MAX);
return;
}
ret = xbc_init(data, size, &msg, &pos);
if (ret < 0) {
if (pos < 0)
pr_err("Failed to init bootconfig: %s.\n", msg);
else
pr_err("Failed to parse bootconfig: %s at %d.\n",
msg, pos);
} else {
xbc_get_info(&ret, NULL);
pr_info("Load bootconfig: %ld bytes %d nodes\n", (long)size, ret);
/* keys starting with "kernel." are passed via cmdline */
extra_command_line = xbc_make_cmdline("kernel");
/* Also, "init." keys are init arguments */
extra_init_args = xbc_make_cmdline("init");
}
return;
}
static void __init exit_boot_config(void)
{
xbc_exit();
}
#else /* !CONFIG_BOOT_CONFIG */
static void __init setup_boot_config(void)
{
/* Remove bootconfig data from initrd */
get_boot_config_from_initrd(NULL);
}
static int __init warn_bootconfig(char *str)
{
pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n");
return 0;
}
#define exit_boot_config() do {} while (0)
#endif /* CONFIG_BOOT_CONFIG */
early_param("bootconfig", warn_bootconfig);
bool __init cmdline_has_extra_options(void)
{
return extra_command_line || extra_init_args;
}
/* Change NUL term back to "=", to make "param" the whole string. */
static void __init repair_env_string(char *param, char *val)
{
if (val) {
/* param=val or param="val"? */
if (val == param+strlen(param)+1)
val[-1] = '=';
else if (val == param+strlen(param)+2) {
val[-2] = '=';
memmove(val-1, val, strlen(val)+1);
} else
BUG();
}
}
/* Anything after -- gets handed straight to init. */
static int __init set_init_arg(char *param, char *val,
const char *unused, void *arg)
{
unsigned int i;
if (panic_later)
return 0;
repair_env_string(param, val);
for (i = 0; argv_init[i]; i++) {
if (i == MAX_INIT_ARGS) {
panic_later = "init";
panic_param = param;
return 0;
}
}
argv_init[i] = param;
return 0;
}
/*
* Unknown boot options get handed to init, unless they look like
* unused parameters (modprobe will find them in /proc/cmdline).
*/
static int __init unknown_bootoption(char *param, char *val,
const char *unused, void *arg)
{
size_t len = strlen(param);
/* Handle params aliased to sysctls */
if (sysctl_is_alias(param))
return 0;
repair_env_string(param, val);
/* Handle obsolete-style parameters */
if (obsolete_checksetup(param))
return 0;
/* Unused module parameter. */
if (strnchr(param, len, '.'))
return 0;
if (panic_later)
return 0;
if (val) {
/* Environment option */
unsigned int i;
for (i = 0; envp_init[i]; i++) {
if (i == MAX_INIT_ENVS) {
panic_later = "env";
panic_param = param;
}
if (!strncmp(param, envp_init[i], len+1))
break;
}
envp_init[i] = param;
} else {
/* Command line option */
unsigned int i;
for (i = 0; argv_init[i]; i++) {
if (i == MAX_INIT_ARGS) {
panic_later = "init";
panic_param = param;
}
}
argv_init[i] = param;
}
return 0;
}
static int __init init_setup(char *str)
{
unsigned int i;
execute_command = str;
/*
* In case LILO is going to boot us with default command line,
* it prepends "auto" before the whole cmdline which makes
* the shell think it should execute a script with such name.
* So we ignore all arguments entered _before_ init=... [MJ]
*/
for (i = 1; i < MAX_INIT_ARGS; i++)
argv_init[i] = NULL;
return 1;
}
__setup("init=", init_setup);
static int __init rdinit_setup(char *str)
{
unsigned int i;
ramdisk_execute_command = str;
/* See "auto" comment in init_setup */
for (i = 1; i < MAX_INIT_ARGS; i++)
argv_init[i] = NULL;
return 1;
}
__setup("rdinit=", rdinit_setup);
#ifndef CONFIG_SMP
static inline void setup_nr_cpu_ids(void) { }
static inline void smp_prepare_cpus(unsigned int maxcpus) { }
#endif
/*
* We need to store the untouched command line for future reference.
* We also need to store the touched command line since the parameter
* parsing is performed in place, and we should allow a component to
* store reference of name/value for future reference.
*/
static void __init setup_command_line(char *command_line)
{
size_t len, xlen = 0, ilen = 0;
if (extra_command_line)
xlen = strlen(extra_command_line);
if (extra_init_args) {
extra_init_args = strim(extra_init_args); /* remove trailing space */
ilen = strlen(extra_init_args) + 4; /* for " -- " */
}
len = xlen + strlen(boot_command_line) + ilen + 1;
saved_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
if (!saved_command_line)
panic("%s: Failed to allocate %zu bytes\n", __func__, len);
len = xlen + strlen(command_line) + 1;
static_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
if (!static_command_line)
panic("%s: Failed to allocate %zu bytes\n", __func__, len);
if (xlen) {
/*
* We have to put extra_command_line before boot command
* lines because there could be dashes (separator of init
* command line) in the command lines.
*/
strcpy(saved_command_line, extra_command_line);
strcpy(static_command_line, extra_command_line);
}
strcpy(saved_command_line + xlen, boot_command_line);
strcpy(static_command_line + xlen, command_line);
if (ilen) {
/*
* Append supplemental init boot args to saved_command_line
* so that user can check what command line options passed
* to init.
* The order should always be
* " -- "[bootconfig init-param][cmdline init-param]
*/
if (initargs_offs) {
len = xlen + initargs_offs;
strcpy(saved_command_line + len, extra_init_args);
len += ilen - 4; /* strlen(extra_init_args) */
strcpy(saved_command_line + len,
boot_command_line + initargs_offs - 1);
} else {
len = strlen(saved_command_line);
strcpy(saved_command_line + len, " -- ");
len += 4;
strcpy(saved_command_line + len, extra_init_args);
}
}
saved_command_line_len = strlen(saved_command_line);
}
/*
* We need to finalize in a non-__init function or else race conditions
* between the root thread and the init thread may cause start_kernel to
* be reaped by free_initmem before the root thread has proceeded to
* cpu_idle.
*
* gcc-3.4 accidentally inlines this function, so use noinline.
*/
static __initdata DECLARE_COMPLETION(kthreadd_done);
static noinline void __ref __noreturn rest_init(void)
{
struct task_struct *tsk;
int pid;
rcu_scheduler_starting();
/*
* We need to spawn init first so that it obtains pid 1, however
* the init task will end up wanting to create kthreads, which, if
* we schedule it before we create kthreadd, will OOPS.
*/
pid = user_mode_thread(kernel_init, NULL, CLONE_FS);
/*
* Pin init on the boot CPU. Task migration is not properly working
* until sched_init_smp() has been run. It will set the allowed
* CPUs for init to the non isolated CPUs.
*/
rcu_read_lock();
tsk = find_task_by_pid_ns(pid, &init_pid_ns);
tsk->flags |= PF_NO_SETAFFINITY;
set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id()));
rcu_read_unlock();
numa_default_policy();
pid = kernel_thread(kthreadd, NULL, NULL, CLONE_FS | CLONE_FILES);
rcu_read_lock();
kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
rcu_read_unlock();
/*
* Enable might_sleep() and smp_processor_id() checks.
* They cannot be enabled earlier because with CONFIG_PREEMPTION=y
* kernel_thread() would trigger might_sleep() splats. With
* CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled
* already, but it's stuck on the kthreadd_done completion.
*/
system_state = SYSTEM_SCHEDULING;
complete(&kthreadd_done);
/*
* The boot idle thread must execute schedule()
* at least once to get things moving:
*/
schedule_preempt_disabled();
/* Call into cpu_idle with preempt disabled */
cpu_startup_entry(CPUHP_ONLINE);
}
/* Check for early params. */
static int __init do_early_param(char *param, char *val,
const char *unused, void *arg)
{
const struct obs_kernel_param *p;
for (p = __setup_start; p < __setup_end; p++) {
if ((p->early && parameq(param, p->str)) ||
(strcmp(param, "console") == 0 &&
strcmp(p->str, "earlycon") == 0)
) {
if (p->setup_func(val) != 0)
pr_warn("Malformed early option '%s'\n", param);
}
}
/* We accept everything at this stage. */
return 0;
}
void __init parse_early_options(char *cmdline)
{
parse_args("early options", cmdline, NULL, 0, 0, 0, NULL,
do_early_param);
}
/* Arch code calls this early on, or if not, just before other parsing. */
void __init parse_early_param(void)
{
static int done __initdata;
static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
if (done)
return;
/* All fall through to do_early_param. */
strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
parse_early_options(tmp_cmdline);
done = 1;
}
void __init __weak arch_post_acpi_subsys_init(void) { }
void __init __weak smp_setup_processor_id(void)
{
}
void __init __weak smp_prepare_boot_cpu(void)
{
}
# if THREAD_SIZE >= PAGE_SIZE
void __init __weak thread_stack_cache_init(void)
{
}
#endif
void __init __weak poking_init(void) { }
void __init __weak pgtable_cache_init(void) { }
void __init __weak trap_init(void) { }
bool initcall_debug;
core_param(initcall_debug, initcall_debug, bool, 0644);
#ifdef TRACEPOINTS_ENABLED
static void __init initcall_debug_enable(void);
#else
static inline void initcall_debug_enable(void)
{
}
#endif
#ifdef CONFIG_RANDOMIZE_KSTACK_OFFSET
DEFINE_STATIC_KEY_MAYBE_RO(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT,
randomize_kstack_offset);
DEFINE_PER_CPU(u32, kstack_offset);
static int __init early_randomize_kstack_offset(char *buf)
{
int ret;
bool bool_result;
ret = kstrtobool(buf, &bool_result);
if (ret)
return ret;
if (bool_result)
static_branch_enable(&randomize_kstack_offset);
else
static_branch_disable(&randomize_kstack_offset);
return 0;
}
early_param("randomize_kstack_offset", early_randomize_kstack_offset);
#endif
static void __init print_unknown_bootoptions(void)
{
char *unknown_options;
char *end;
const char *const *p;
size_t len;
if (panic_later || (!argv_init[1] && !envp_init[2]))
return;
/*
* Determine how many options we have to print out, plus a space
* before each
*/
len = 1; /* null terminator */
for (p = &argv_init[1]; *p; p++) {
len++;
len += strlen(*p);
}
for (p = &envp_init[2]; *p; p++) {
len++;
len += strlen(*p);
}
unknown_options = memblock_alloc(len, SMP_CACHE_BYTES);
if (!unknown_options) {
pr_err("%s: Failed to allocate %zu bytes\n",
__func__, len);
return;
}
end = unknown_options;
for (p = &argv_init[1]; *p; p++)
end += sprintf(end, " %s", *p);
for (p = &envp_init[2]; *p; p++)
end += sprintf(end, " %s", *p);
/* Start at unknown_options[1] to skip the initial space */
pr_notice("Unknown kernel command line parameters \"%s\", will be passed to user space.\n",
&unknown_options[1]);
memblock_free(unknown_options, len);
}
static void __init early_numa_node_init(void)
{
#ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID
#ifndef cpu_to_node
int cpu;
/* The early_cpu_to_node() should be ready here. */
for_each_possible_cpu(cpu)
set_cpu_numa_node(cpu, early_cpu_to_node(cpu));
#endif
#endif
}
asmlinkage __visible __init __no_sanitize_address __noreturn __no_stack_protector
void start_kernel(void)
{
char *command_line;
char *after_dashes;
set_task_stack_end_magic(&init_task);
smp_setup_processor_id();
debug_objects_early_init();
init_vmlinux_build_id();
cgroup_init_early();
local_irq_disable();
early_boot_irqs_disabled = true;
/*
* Interrupts are still disabled. Do necessary setups, then
* enable them.
*/
boot_cpu_init();
page_address_init();
pr_notice("%s", linux_banner);
early_security_init();
setup_arch(&command_line);
setup_boot_config();
setup_command_line(command_line);
setup_nr_cpu_ids();
setup_per_cpu_areas();
smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
early_numa_node_init();
boot_cpu_hotplug_init();
pr_notice("Kernel command line: %s\n", saved_command_line);
/* parameters may set static keys */
jump_label_init();
parse_early_param();
after_dashes = parse_args("Booting kernel",
static_command_line, __start___param,
__stop___param - __start___param,
-1, -1, NULL, &unknown_bootoption);
print_unknown_bootoptions();
if (!IS_ERR_OR_NULL(after_dashes))
parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
NULL, set_init_arg);
if (extra_init_args)
parse_args("Setting extra init args", extra_init_args,
NULL, 0, -1, -1, NULL, set_init_arg);
/* Architectural and non-timekeeping rng init, before allocator init */
random_init_early(command_line);
/*
* These use large bootmem allocations and must precede
* initalization of page allocator
*/
setup_log_buf(0);
vfs_caches_init_early();
sort_main_extable();
trap_init();
mm_core_init();
poking_init();
ftrace_init();
/* trace_printk can be enabled here */
early_trace_init();
/*
* Set up the scheduler prior starting any interrupts (such as the
* timer interrupt). Full topology setup happens at smp_init()
* time - but meanwhile we still have a functioning scheduler.
*/
sched_init();
if (WARN(!irqs_disabled(),
"Interrupts were enabled *very* early, fixing it\n"))
local_irq_disable();
radix_tree_init();
maple_tree_init();
/*
* Set up housekeeping before setting up workqueues to allow the unbound
* workqueue to take non-housekeeping into account.
*/
housekeeping_init();
/*
* Allow workqueue creation and work item queueing/cancelling
* early. Work item execution depends on kthreads and starts after
* workqueue_init().
*/
workqueue_init_early();
rcu_init();
/* Trace events are available after this */
trace_init();
if (initcall_debug)
initcall_debug_enable();
context_tracking_init();
/* init some links before init_ISA_irqs() */
early_irq_init();
init_IRQ();
tick_init();
rcu_init_nohz();
init_timers();
srcu_init();
hrtimers_init();
softirq_init();
timekeeping_init();
time_init();
/* This must be after timekeeping is initialized */
random_init();
/* These make use of the fully initialized rng */
kfence_init();
boot_init_stack_canary();
perf_event_init();
profile_init();
call_function_init();
WARN(!irqs_disabled(), "Interrupts were enabled early\n");
early_boot_irqs_disabled = false;
local_irq_enable();
kmem_cache_init_late();
/*
* HACK ALERT! This is early. We're enabling the console before
* we've done PCI setups etc, and console_init() must be aware of
* this. But we do want output early, in case something goes wrong.
*/
console_init();
if (panic_later)
panic("Too many boot %s vars at `%s'", panic_later,
panic_param);
lockdep_init();
/*
* Need to run this when irqs are enabled, because it wants
* to self-test [hard/soft]-irqs on/off lock inversion bugs
* too:
*/
locking_selftest();
#ifdef CONFIG_BLK_DEV_INITRD
if (initrd_start && !initrd_below_start_ok &&
page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",
page_to_pfn(virt_to_page((void *)initrd_start)),
min_low_pfn);
initrd_start = 0;
}
#endif
setup_per_cpu_pageset();
numa_policy_init();
acpi_early_init();
if (late_time_init)
late_time_init();
sched_clock_init();
calibrate_delay();
arch_cpu_finalize_init();
pid_idr_init();
anon_vma_init();
#ifdef CONFIG_X86
if (efi_enabled(EFI_RUNTIME_SERVICES))
efi_enter_virtual_mode();
#endif
thread_stack_cache_init();
cred_init();
fork_init();
proc_caches_init();
uts_ns_init();
key_init();
security_init();
dbg_late_init();
net_ns_init();
vfs_caches_init();
pagecache_init();
signals_init();
seq_file_init();
proc_root_init();
nsfs_init();
pidfs_init();
cpuset_init();
cgroup_init();
taskstats_init_early();
delayacct_init();
acpi_subsystem_init();
arch_post_acpi_subsys_init();
kcsan_init();
/* Do the rest non-__init'ed, we're now alive */
rest_init();
/*
* Avoid stack canaries in callers of boot_init_stack_canary for gcc-10
* and older.
*/
#if !__has_attribute(__no_stack_protector__)
prevent_tail_call_optimization();
#endif
}
/* Call all constructor functions linked into the kernel. */
static void __init do_ctors(void)
{
/*
* For UML, the constructors have already been called by the
* normal setup code as it's just a normal ELF binary, so we
* cannot do it again - but we do need CONFIG_CONSTRUCTORS
* even on UML for modules.
*/
#if defined(CONFIG_CONSTRUCTORS) && !defined(CONFIG_UML)
ctor_fn_t *fn = (ctor_fn_t *) __ctors_start;
for (; fn < (ctor_fn_t *) __ctors_end; fn++)
(*fn)();
#endif
}
#ifdef CONFIG_KALLSYMS
struct blacklist_entry {
struct list_head next;
char *buf;
};
static __initdata_or_module LIST_HEAD(blacklisted_initcalls);
static int __init initcall_blacklist(char *str)
{
char *str_entry;
struct blacklist_entry *entry;
/* str argument is a comma-separated list of functions */
do {
str_entry = strsep(&str, ",");
if (str_entry) {
pr_debug("blacklisting initcall %s\n", str_entry);
entry = memblock_alloc(sizeof(*entry),
SMP_CACHE_BYTES);
if (!entry)
panic("%s: Failed to allocate %zu bytes\n",
__func__, sizeof(*entry));
entry->buf = memblock_alloc(strlen(str_entry) + 1,
SMP_CACHE_BYTES);
if (!entry->buf)
panic("%s: Failed to allocate %zu bytes\n",
__func__, strlen(str_entry) + 1);
strcpy(entry->buf, str_entry);
list_add(&entry->next, &blacklisted_initcalls);
}
} while (str_entry);
return 1;
}
static bool __init_or_module initcall_blacklisted(initcall_t fn)
{
struct blacklist_entry *entry;
char fn_name[KSYM_SYMBOL_LEN];
unsigned long addr;
if (list_empty(&blacklisted_initcalls))
return false;
addr = (unsigned long) dereference_function_descriptor(fn);
sprint_symbol_no_offset(fn_name, addr);
/*
* fn will be "function_name [module_name]" where [module_name] is not
* displayed for built-in init functions. Strip off the [module_name].
*/
strreplace(fn_name, ' ', '\0');
list_for_each_entry(entry, &blacklisted_initcalls, next) {
if (!strcmp(fn_name, entry->buf)) {
pr_debug("initcall %s blacklisted\n", fn_name);
return true;
}
}
return false;
}
#else
static int __init initcall_blacklist(char *str)
{
pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n");
return 0;
}
static bool __init_or_module initcall_blacklisted(initcall_t fn)
{
return false;
}
#endif
__setup("initcall_blacklist=", initcall_blacklist);
static __init_or_module void
trace_initcall_start_cb(void *data, initcall_t fn)
{
ktime_t *calltime = data;
printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current));
*calltime = ktime_get();
}
static __init_or_module void
trace_initcall_finish_cb(void *data, initcall_t fn, int ret)
{
ktime_t rettime, *calltime = data;
rettime = ktime_get();
printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n",
fn, ret, (unsigned long long)ktime_us_delta(rettime, *calltime));
}
static ktime_t initcall_calltime;
#ifdef TRACEPOINTS_ENABLED
static void __init initcall_debug_enable(void)
{
int ret;
ret = register_trace_initcall_start(trace_initcall_start_cb,
&initcall_calltime);
ret |= register_trace_initcall_finish(trace_initcall_finish_cb,
&initcall_calltime);
WARN(ret, "Failed to register initcall tracepoints\n");
}
# define do_trace_initcall_start trace_initcall_start
# define do_trace_initcall_finish trace_initcall_finish
#else
static inline void do_trace_initcall_start(initcall_t fn)
{
if (!initcall_debug)
return;
trace_initcall_start_cb(&initcall_calltime, fn);
}
static inline void do_trace_initcall_finish(initcall_t fn, int ret)
{
if (!initcall_debug)
return;
trace_initcall_finish_cb(&initcall_calltime, fn, ret);
}
#endif /* !TRACEPOINTS_ENABLED */
int __init_or_module do_one_initcall(initcall_t fn)
{
int count = preempt_count();
char msgbuf[64];
int ret;
if (initcall_blacklisted(fn))
return -EPERM;
do_trace_initcall_start(fn);
ret = fn();
do_trace_initcall_finish(fn, ret);
msgbuf[0] = 0;
if (preempt_count() != count) {
sprintf(msgbuf, "preemption imbalance ");
preempt_count_set(count);
}
if (irqs_disabled()) {
strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
local_irq_enable();
}
WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf);
add_latent_entropy();
return ret;
}
static initcall_entry_t *initcall_levels[] __initdata = {
__initcall0_start,
__initcall1_start,
__initcall2_start,
__initcall3_start,
__initcall4_start,
__initcall5_start,
__initcall6_start,
__initcall7_start,
__initcall_end,
};
/* Keep these in sync with initcalls in include/linux/init.h */
static const char *initcall_level_names[] __initdata = {
"pure",
"core",
"postcore",
"arch",
"subsys",
"fs",
"device",
"late",
};
static int __init ignore_unknown_bootoption(char *param, char *val,
const char *unused, void *arg)
{
return 0;
}
static void __init do_initcall_level(int level, char *command_line)
{
initcall_entry_t *fn;
parse_args(initcall_level_names[level],
command_line, __start___param,
__stop___param - __start___param,
level, level,
NULL, ignore_unknown_bootoption);
trace_initcall_level(initcall_level_names[level]);
for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
do_one_initcall(initcall_from_entry(fn));
}
static void __init do_initcalls(void)
{
int level;
size_t len = saved_command_line_len + 1;
char *command_line;
command_line = kzalloc(len, GFP_KERNEL);
if (!command_line)
panic("%s: Failed to allocate %zu bytes\n", __func__, len);
for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) {
/* Parser modifies command_line, restore it each time */
strcpy(command_line, saved_command_line);
do_initcall_level(level, command_line);
}
kfree(command_line);
}
/*
* Ok, the machine is now initialized. None of the devices
* have been touched yet, but the CPU subsystem is up and
* running, and memory and process management works.
*
* Now we can finally start doing some real work..
*/
static void __init do_basic_setup(void)
{
cpuset_init_smp();
driver_init();
init_irq_proc();
do_ctors();
do_initcalls();
}
static void __init do_pre_smp_initcalls(void)
{
initcall_entry_t *fn;
trace_initcall_level("early");
for (fn = __initcall_start; fn < __initcall0_start; fn++)
do_one_initcall(initcall_from_entry(fn));
}
static int run_init_process(const char *init_filename)
{
const char *const *p;
argv_init[0] = init_filename;
pr_info("Run %s as init process\n", init_filename);
pr_debug(" with arguments:\n");
for (p = argv_init; *p; p++)
pr_debug(" %s\n", *p);
pr_debug(" with environment:\n");
for (p = envp_init; *p; p++)
pr_debug(" %s\n", *p);
return kernel_execve(init_filename, argv_init, envp_init);
}
static int try_to_run_init_process(const char *init_filename)
{
int ret;
ret = run_init_process(init_filename);
if (ret && ret != -ENOENT) {
pr_err("Starting init: %s exists but couldn't execute it (error %d)\n",
init_filename, ret);
}
return ret;
}
static noinline void __init kernel_init_freeable(void);
#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX)
bool rodata_enabled __ro_after_init = true;
#ifndef arch_parse_debug_rodata
static inline bool arch_parse_debug_rodata(char *str) { return false; }
#endif
static int __init set_debug_rodata(char *str)
{
if (arch_parse_debug_rodata(str))
return 0;
if (str && !strcmp(str, "on"))
rodata_enabled = true;
else if (str && !strcmp(str, "off"))
rodata_enabled = false;
else
pr_warn("Invalid option string for rodata: '%s'\n", str);
return 0;
}
early_param("rodata", set_debug_rodata);
#endif
static void mark_readonly(void)
{
if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX) && rodata_enabled) {
/*
* load_module() results in W+X mappings, which are cleaned
* up with init_free_wq. Let's make sure that queued work is
* flushed so that we don't hit false positives looking for
* insecure pages which are W+X.
*/
flush_module_init_free_work();
jump_label_init_ro();
mark_rodata_ro();
debug_checkwx();
rodata_test();
} else if (IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) {
pr_info("Kernel memory protection disabled.\n");
} else if (IS_ENABLED(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX)) {
pr_warn("Kernel memory protection not selected by kernel config.\n");
} else {
pr_warn("This architecture does not have kernel memory protection.\n");
}
}
void __weak free_initmem(void)
{
free_initmem_default(POISON_FREE_INITMEM);
}
static int __ref kernel_init(void *unused)
{
int ret;
/*
* Wait until kthreadd is all set-up.
*/
wait_for_completion(&kthreadd_done);
kernel_init_freeable();
/* need to finish all async __init code before freeing the memory */
async_synchronize_full();
system_state = SYSTEM_FREEING_INITMEM;
kprobe_free_init_mem();
ftrace_free_init_mem();
kgdb_free_init_mem();
exit_boot_config();
free_initmem();
mark_readonly();
/*
* Kernel mappings are now finalized - update the userspace page-table
* to finalize PTI.
*/
pti_finalize();
system_state = SYSTEM_RUNNING;
numa_default_policy();
rcu_end_inkernel_boot();
do_sysctl_args();
if (ramdisk_execute_command) {
ret = run_init_process(ramdisk_execute_command);
if (!ret)
return 0;
pr_err("Failed to execute %s (error %d)\n",
ramdisk_execute_command, ret);
}
/*
* We try each of these until one succeeds.
*
* The Bourne shell can be used instead of init if we are
* trying to recover a really broken machine.
*/
if (execute_command) {
ret = run_init_process(execute_command);
if (!ret)
return 0;
panic("Requested init %s failed (error %d).",
execute_command, ret);
}
if (CONFIG_DEFAULT_INIT[0] != '\0') {
ret = run_init_process(CONFIG_DEFAULT_INIT);
if (ret)
pr_err("Default init %s failed (error %d)\n",
CONFIG_DEFAULT_INIT, ret);
else
return 0;
}
if (!try_to_run_init_process("/sbin/init") ||
!try_to_run_init_process("/etc/init") ||
!try_to_run_init_process("/bin/init") ||
!try_to_run_init_process("/bin/sh"))
return 0;
panic("No working init found. Try passing init= option to kernel. "
"See Linux Documentation/admin-guide/init.rst for guidance.");
}
/* Open /dev/console, for stdin/stdout/stderr, this should never fail */
void __init console_on_rootfs(void)
{
struct file *file = filp_open("/dev/console", O_RDWR, 0);
if (IS_ERR(file)) {
pr_err("Warning: unable to open an initial console.\n");
return;
}
init_dup(file);
init_dup(file);
init_dup(file);
fput(file);
}
static noinline void __init kernel_init_freeable(void)
{
/* Now the scheduler is fully set up and can do blocking allocations */
gfp_allowed_mask = __GFP_BITS_MASK;
/*
* init can allocate pages on any node
*/
set_mems_allowed(node_states[N_MEMORY]);
cad_pid = get_pid(task_pid(current));
smp_prepare_cpus(setup_max_cpus);
workqueue_init();
init_mm_internals();
rcu_init_tasks_generic();
do_pre_smp_initcalls();
lockup_detector_init();
smp_init();
sched_init_smp();
workqueue_init_topology();
async_init();
padata_init();
page_alloc_init_late();
do_basic_setup();
kunit_run_all_tests();
wait_for_initramfs();
console_on_rootfs();
/*
* check if there is an early userspace init. If yes, let it do all
* the work
*/
if (init_eaccess(ramdisk_execute_command) != 0) {
ramdisk_execute_command = NULL;
prepare_namespace();
}
/*
* Ok, we have completed the initial bootup, and
* we're essentially up and running. Get rid of the
* initmem segments and start the user-mode stuff..
*
* rootfs is available now, try loading the public keys
* and default modules
*/
integrity_load_keys();
}