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- diff -Nur linux-5.4.69.orig/init/initramfs.c linux-5.4.69/init/initramfs.c
- --- linux-5.4.69.orig/init/initramfs.c 2020-10-01 13:19:27.000000000 +0200
- +++ linux-5.4.69/init/initramfs.c 2020-10-31 02:34:40.814412219 +0100
- @@ -674,6 +674,9 @@
- initrd_start = 0;
- initrd_end = 0;
-
- +#ifdef CONFIG_DEVTMPFS_MOUNT
- + devtmpfs_mount("dev");
- +#endif
- flush_delayed_fput();
- return 0;
- }
- diff -Nur linux-5.4.69.orig/init/main.c linux-5.4.69/init/main.c
- --- linux-5.4.69.orig/init/main.c 2020-10-01 13:19:27.000000000 +0200
- +++ linux-5.4.69/init/main.c 2020-10-31 02:32:35.699678836 +0100
- @@ -1198,6 +1198,8 @@
- if (ksys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
- pr_err("Warning: unable to open an initial console.\n");
-
- + printk(KERN_WARNING "Starting Linux (built with OpenADK).\n");
- +
- (void) ksys_dup(0);
- (void) ksys_dup(0);
- /*
- @@ -1206,7 +1208,7 @@
- */
-
- if (!ramdisk_execute_command)
- - ramdisk_execute_command = "/init";
- + ramdisk_execute_command = "/sbin/init";
-
- if (ksys_access((const char __user *)
- ramdisk_execute_command, 0) != 0) {
- diff -Nur linux-5.4.69.orig/init/main.c.orig linux-5.4.69/init/main.c.orig
- --- linux-5.4.69.orig/init/main.c.orig 1970-01-01 01:00:00.000000000 +0100
- +++ linux-5.4.69/init/main.c.orig 2020-10-01 13:19:27.000000000 +0200
- @@ -0,0 +1,1227 @@
- +// 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/console.h>
- +#include <linux/nmi.h>
- +#include <linux/percpu.h>
- +#include <linux/kmod.h>
- +#include <linux/kprobes.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/rcupdate.h>
- +#include <linux/moduleparam.h>
- +#include <linux/kallsyms.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/buffer_head.h>
- +#include <linux/page_ext.h>
- +#include <linux/debug_locks.h>
- +#include <linux/debugobjects.h>
- +#include <linux/lockdep.h>
- +#include <linux/kmemleak.h>
- +#include <linux/pid_namespace.h>
- +#include <linux/device.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/sfi.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/elevator.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/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/mem_encrypt.h>
- +
- +#include <asm/io.h>
- +#include <asm/bugs.h>
- +#include <asm/setup.h>
- +#include <asm/sections.h>
- +#include <asm/cacheflush.h>
- +
- +#define CREATE_TRACE_POINTS
- +#include <trace/events/initcall.h>
- +
- +static int kernel_init(void *);
- +
- +extern void init_IRQ(void);
- +extern void radix_tree_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
- +
- +extern void time_init(void);
- +/* 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;
- +/* Command line for parameter parsing */
- +static char *static_command_line;
- +/* Command line for per-initcall parameter parsing */
- +static char *initcall_command_line;
- +
- +static char *execute_command;
- +static char *ramdisk_execute_command;
- +
- +/*
- + * 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;
- +
- +extern const struct obs_kernel_param __setup_start[], __setup_end[];
- +
- +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);
- +
- +/* Change NUL term back to "=", to make "param" the whole string. */
- +static int __init repair_env_string(char *param, char *val,
- + const char *unused, void *arg)
- +{
- + 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);
- + val--;
- + } else
- + BUG();
- + }
- + return 0;
- +}
- +
- +/* 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, unused, NULL);
- +
- + 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)
- +{
- + repair_env_string(param, val, unused, NULL);
- +
- + /* Handle obsolete-style parameters */
- + if (obsolete_checksetup(param))
- + return 0;
- +
- + /* Unused module parameter. */
- + if (strchr(param, '.') && (!val || strchr(param, '.') < val))
- + 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], val - param))
- + 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 const unsigned int setup_max_cpus = NR_CPUS;
- +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 = strlen(boot_command_line) + 1;
- +
- + saved_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
- + if (!saved_command_line)
- + panic("%s: Failed to allocate %zu bytes\n", __func__, len);
- +
- + initcall_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
- + if (!initcall_command_line)
- + panic("%s: Failed to allocate %zu bytes\n", __func__, len);
- +
- + static_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
- + if (!static_command_line)
- + panic("%s: Failed to allocate %zu bytes\n", __func__, len);
- +
- + strcpy(saved_command_line, boot_command_line);
- + strcpy(static_command_line, 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);
- +
- +noinline void __ref 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 = kernel_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);
- + set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id()));
- + rcu_read_unlock();
- +
- + numa_default_policy();
- + pid = kernel_thread(kthreadd, 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. */
- + strlcpy(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)
- +{
- +}
- +
- +# if THREAD_SIZE >= PAGE_SIZE
- +void __init __weak thread_stack_cache_init(void)
- +{
- +}
- +#endif
- +
- +void __init __weak mem_encrypt_init(void) { }
- +
- +void __init __weak poking_init(void) { }
- +
- +void __init __weak pgtable_cache_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
- +
- +/* Report memory auto-initialization states for this boot. */
- +static void __init report_meminit(void)
- +{
- + const char *stack;
- +
- + if (IS_ENABLED(CONFIG_INIT_STACK_ALL))
- + stack = "all";
- + else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL))
- + stack = "byref_all";
- + else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF))
- + stack = "byref";
- + else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER))
- + stack = "__user";
- + else
- + stack = "off";
- +
- + pr_info("mem auto-init: stack:%s, heap alloc:%s, heap free:%s\n",
- + stack, want_init_on_alloc(GFP_KERNEL) ? "on" : "off",
- + want_init_on_free() ? "on" : "off");
- + if (want_init_on_free())
- + pr_info("mem auto-init: clearing system memory may take some time...\n");
- +}
- +
- +/*
- + * Set up kernel memory allocators
- + */
- +static void __init mm_init(void)
- +{
- + /*
- + * page_ext requires contiguous pages,
- + * bigger than MAX_ORDER unless SPARSEMEM.
- + */
- + page_ext_init_flatmem();
- + init_debug_pagealloc();
- + report_meminit();
- + mem_init();
- + kmem_cache_init();
- + kmemleak_init();
- + pgtable_init();
- + debug_objects_mem_init();
- + vmalloc_init();
- + ioremap_huge_init();
- + /* Should be run before the first non-init thread is created */
- + init_espfix_bsp();
- + /* Should be run after espfix64 is set up. */
- + pti_init();
- +}
- +
- +void __init __weak arch_call_rest_init(void)
- +{
- + rest_init();
- +}
- +
- +asmlinkage __visible void __init start_kernel(void)
- +{
- + char *command_line;
- + char *after_dashes;
- +
- + set_task_stack_end_magic(&init_task);
- + smp_setup_processor_id();
- + debug_objects_early_init();
- +
- + 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_command_line(command_line);
- + setup_nr_cpu_ids();
- + setup_per_cpu_areas();
- + smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
- + boot_cpu_hotplug_init();
- +
- + build_all_zonelists(NULL);
- + page_alloc_init();
- +
- + pr_notice("Kernel command line: %s\n", boot_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);
- + if (!IS_ERR_OR_NULL(after_dashes))
- + parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
- + NULL, set_init_arg);
- +
- + /*
- + * These use large bootmem allocations and must precede
- + * kmem_cache_init()
- + */
- + setup_log_buf(0);
- + vfs_caches_init_early();
- + sort_main_extable();
- + trap_init();
- + mm_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();
- + /*
- + * Disable preemption - early bootup scheduling is extremely
- + * fragile until we cpu_idle() for the first time.
- + */
- + preempt_disable();
- + if (WARN(!irqs_disabled(),
- + "Interrupts were enabled *very* early, fixing it\n"))
- + local_irq_disable();
- + radix_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();
- + hrtimers_init();
- + softirq_init();
- + timekeeping_init();
- +
- + /*
- + * For best initial stack canary entropy, prepare it after:
- + * - setup_arch() for any UEFI RNG entropy and boot cmdline access
- + * - timekeeping_init() for ktime entropy used in rand_initialize()
- + * - rand_initialize() to get any arch-specific entropy like RDRAND
- + * - add_latent_entropy() to get any latent entropy
- + * - adding command line entropy
- + */
- + rand_initialize();
- + add_latent_entropy();
- + add_device_randomness(command_line, strlen(command_line));
- + boot_init_stack_canary();
- +
- + time_init();
- + 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();
- +
- + /*
- + * This needs to be called before any devices perform DMA
- + * operations that might use the SWIOTLB bounce buffers. It will
- + * mark the bounce buffers as decrypted so that their usage will
- + * not cause "plain-text" data to be decrypted when accessed.
- + */
- + mem_encrypt_init();
- +
- +#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();
- + 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();
- + buffer_init();
- + key_init();
- + security_init();
- + dbg_late_init();
- + vfs_caches_init();
- + pagecache_init();
- + signals_init();
- + seq_file_init();
- + proc_root_init();
- + nsfs_init();
- + cpuset_init();
- + cgroup_init();
- + taskstats_init_early();
- + delayacct_init();
- +
- + poking_init();
- + check_bugs();
- +
- + acpi_subsystem_init();
- + arch_post_acpi_subsys_init();
- + sfi_init_late();
- +
- + /* Do the rest non-__init'ed, we're now alive */
- + arch_call_rest_init();
- +
- + prevent_tail_call_optimization();
- +}
- +
- +/* Call all constructor functions linked into the kernel. */
- +static void __init do_ctors(void)
- +{
- +#ifdef CONFIG_CONSTRUCTORS
- + 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 0;
- +}
- +
- +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 = (ktime_t *)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 *calltime = (ktime_t *)data;
- + ktime_t delta, rettime;
- + unsigned long long duration;
- +
- + rettime = ktime_get();
- + delta = ktime_sub(rettime, *calltime);
- + duration = (unsigned long long) ktime_to_ns(delta) >> 10;
- + printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n",
- + fn, ret, duration);
- +}
- +
- +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;
- +}
- +
- +
- +extern initcall_entry_t __initcall_start[];
- +extern initcall_entry_t __initcall0_start[];
- +extern initcall_entry_t __initcall1_start[];
- +extern initcall_entry_t __initcall2_start[];
- +extern initcall_entry_t __initcall3_start[];
- +extern initcall_entry_t __initcall4_start[];
- +extern initcall_entry_t __initcall5_start[];
- +extern initcall_entry_t __initcall6_start[];
- +extern initcall_entry_t __initcall7_start[];
- +extern initcall_entry_t __initcall_end[];
- +
- +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 void __init do_initcall_level(int level)
- +{
- + initcall_entry_t *fn;
- +
- + strcpy(initcall_command_line, saved_command_line);
- + parse_args(initcall_level_names[level],
- + initcall_command_line, __start___param,
- + __stop___param - __start___param,
- + level, level,
- + NULL, &repair_env_string);
- +
- + 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;
- +
- + for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++)
- + do_initcall_level(level);
- +}
- +
- +/*
- + * 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();
- + usermodehelper_enable();
- + 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)
- +{
- + argv_init[0] = init_filename;
- + pr_info("Run %s as init process\n", init_filename);
- + return do_execve(getname_kernel(init_filename),
- + (const char __user *const __user *)argv_init,
- + (const char __user *const __user *)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;
- +static int __init set_debug_rodata(char *str)
- +{
- + return strtobool(str, &rodata_enabled);
- +}
- +__setup("rodata=", set_debug_rodata);
- +#endif
- +
- +#ifdef CONFIG_STRICT_KERNEL_RWX
- +static void mark_readonly(void)
- +{
- + if (rodata_enabled) {
- + /*
- + * load_module() results in W+X mappings, which are cleaned
- + * up with call_rcu(). 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.
- + */
- + rcu_barrier();
- + mark_rodata_ro();
- + rodata_test();
- + } else
- + pr_info("Kernel memory protection disabled.\n");
- +}
- +#else
- +static inline void mark_readonly(void)
- +{
- + pr_warn("This architecture does not have kernel memory protection.\n");
- +}
- +#endif
- +
- +void __weak free_initmem(void)
- +{
- + free_initmem_default(POISON_FREE_INITMEM);
- +}
- +
- +static int __ref kernel_init(void *unused)
- +{
- + int ret;
- +
- + kernel_init_freeable();
- + /* need to finish all async __init code before freeing the memory */
- + async_synchronize_full();
- + kprobe_free_init_mem();
- + ftrace_free_init_mem();
- + 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();
- +
- + 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 (!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.");
- +}
- +
- +static noinline void __init kernel_init_freeable(void)
- +{
- + /*
- + * Wait until kthreadd is all set-up.
- + */
- + wait_for_completion(&kthreadd_done);
- +
- + /* 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 = task_pid(current);
- +
- + smp_prepare_cpus(setup_max_cpus);
- +
- + workqueue_init();
- +
- + init_mm_internals();
- +
- + do_pre_smp_initcalls();
- + lockup_detector_init();
- +
- + smp_init();
- + sched_init_smp();
- +
- + page_alloc_init_late();
- + /* Initialize page ext after all struct pages are initialized. */
- + page_ext_init();
- +
- + do_basic_setup();
- +
- + /* Open the /dev/console on the rootfs, this should never fail */
- + if (ksys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0)
- + pr_err("Warning: unable to open an initial console.\n");
- +
- + (void) ksys_dup(0);
- + (void) ksys_dup(0);
- + /*
- + * check if there is an early userspace init. If yes, let it do all
- + * the work
- + */
- +
- + if (!ramdisk_execute_command)
- + ramdisk_execute_command = "/init";
- +
- + if (ksys_access((const char __user *)
- + ramdisk_execute_command, 0) != 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();
- +}
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