Focus on code where we are doing multiplications within malloc(9). None of these ire likely to overflow, however the change is still useful as some static checkers can benefit from the allocation attributes we use for mallocarray. This initial sweep only covers malloc(9) calls with M_NOWAIT. No good reason but I started doing the changes before r327796 and at that time it was convenient to make sure the sorrounding code could handle NULL values. X-Differential revision: https://reviews.freebsd.org/D13837
879 lines
23 KiB
C
879 lines
23 KiB
C
/*-
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* SPDX-License-Identifier: BSD-4-Clause
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*
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* Copyright (c) 1995 Terrence R. Lambert
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* All rights reserved.
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*
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* Copyright (c) 1982, 1986, 1989, 1991, 1992, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)init_main.c 8.9 (Berkeley) 1/21/94
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include "opt_init_path.h"
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#include "opt_verbose_sysinit.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/exec.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/jail.h>
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#include <sys/ktr.h>
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#include <sys/lock.h>
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#include <sys/loginclass.h>
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysctl.h>
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#include <sys/proc.h>
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#include <sys/racct.h>
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#include <sys/resourcevar.h>
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#include <sys/systm.h>
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#include <sys/signalvar.h>
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#include <sys/vnode.h>
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#include <sys/sysent.h>
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#include <sys/reboot.h>
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#include <sys/sched.h>
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#include <sys/sx.h>
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#include <sys/sysproto.h>
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#include <sys/vmmeter.h>
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#include <sys/unistd.h>
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#include <sys/malloc.h>
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#include <sys/conf.h>
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#include <sys/cpuset.h>
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#include <machine/cpu.h>
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#include <security/audit/audit.h>
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#include <security/mac/mac_framework.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <sys/copyright.h>
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#include <ddb/ddb.h>
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#include <ddb/db_sym.h>
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void mi_startup(void); /* Should be elsewhere */
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/* Components of the first process -- never freed. */
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static struct session session0;
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static struct pgrp pgrp0;
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struct proc proc0;
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struct thread0_storage thread0_st __aligned(32);
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struct vmspace vmspace0;
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struct proc *initproc;
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#ifndef BOOTHOWTO
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#define BOOTHOWTO 0
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#endif
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int boothowto = BOOTHOWTO; /* initialized so that it can be patched */
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SYSCTL_INT(_debug, OID_AUTO, boothowto, CTLFLAG_RD, &boothowto, 0,
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"Boot control flags, passed from loader");
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#ifndef BOOTVERBOSE
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#define BOOTVERBOSE 0
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#endif
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int bootverbose = BOOTVERBOSE;
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SYSCTL_INT(_debug, OID_AUTO, bootverbose, CTLFLAG_RW, &bootverbose, 0,
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"Control the output of verbose kernel messages");
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#ifdef INVARIANTS
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FEATURE(invariants, "Kernel compiled with INVARIANTS, may affect performance");
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#endif
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/*
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* This ensures that there is at least one entry so that the sysinit_set
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* symbol is not undefined. A sybsystem ID of SI_SUB_DUMMY is never
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* executed.
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*/
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SYSINIT(placeholder, SI_SUB_DUMMY, SI_ORDER_ANY, NULL, NULL);
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/*
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* The sysinit table itself. Items are checked off as the are run.
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* If we want to register new sysinit types, add them to newsysinit.
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*/
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SET_DECLARE(sysinit_set, struct sysinit);
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struct sysinit **sysinit, **sysinit_end;
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struct sysinit **newsysinit, **newsysinit_end;
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EVENTHANDLER_LIST_DECLARE(process_init);
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EVENTHANDLER_LIST_DECLARE(thread_init);
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EVENTHANDLER_LIST_DECLARE(process_ctor);
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EVENTHANDLER_LIST_DECLARE(thread_ctor);
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/*
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* Merge a new sysinit set into the current set, reallocating it if
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* necessary. This can only be called after malloc is running.
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*/
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void
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sysinit_add(struct sysinit **set, struct sysinit **set_end)
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{
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struct sysinit **newset;
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struct sysinit **sipp;
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struct sysinit **xipp;
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int count;
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count = set_end - set;
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if (newsysinit)
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count += newsysinit_end - newsysinit;
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else
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count += sysinit_end - sysinit;
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newset = mallocarray(count, sizeof(*sipp), M_TEMP, M_NOWAIT);
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if (newset == NULL)
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panic("cannot malloc for sysinit");
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xipp = newset;
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if (newsysinit)
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for (sipp = newsysinit; sipp < newsysinit_end; sipp++)
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*xipp++ = *sipp;
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else
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for (sipp = sysinit; sipp < sysinit_end; sipp++)
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*xipp++ = *sipp;
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for (sipp = set; sipp < set_end; sipp++)
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*xipp++ = *sipp;
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if (newsysinit)
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free(newsysinit, M_TEMP);
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newsysinit = newset;
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newsysinit_end = newset + count;
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}
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#if defined (DDB) && defined(VERBOSE_SYSINIT)
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static const char *
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symbol_name(vm_offset_t va, db_strategy_t strategy)
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{
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const char *name;
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c_db_sym_t sym;
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db_expr_t offset;
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if (va == 0)
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return (NULL);
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sym = db_search_symbol(va, strategy, &offset);
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if (offset != 0)
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return (NULL);
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db_symbol_values(sym, &name, NULL);
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return (name);
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}
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#endif
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/*
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* System startup; initialize the world, create process 0, mount root
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* filesystem, and fork to create init and pagedaemon. Most of the
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* hard work is done in the lower-level initialization routines including
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* startup(), which does memory initialization and autoconfiguration.
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*
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* This allows simple addition of new kernel subsystems that require
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* boot time initialization. It also allows substitution of subsystem
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* (for instance, a scheduler, kernel profiler, or VM system) by object
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* module. Finally, it allows for optional "kernel threads".
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*/
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void
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mi_startup(void)
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{
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struct sysinit **sipp; /* system initialization*/
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struct sysinit **xipp; /* interior loop of sort*/
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struct sysinit *save; /* bubble*/
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#if defined(VERBOSE_SYSINIT)
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int last;
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int verbose;
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#endif
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TSENTER();
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if (boothowto & RB_VERBOSE)
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bootverbose++;
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if (sysinit == NULL) {
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sysinit = SET_BEGIN(sysinit_set);
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sysinit_end = SET_LIMIT(sysinit_set);
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}
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restart:
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/*
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* Perform a bubble sort of the system initialization objects by
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* their subsystem (primary key) and order (secondary key).
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*/
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for (sipp = sysinit; sipp < sysinit_end; sipp++) {
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for (xipp = sipp + 1; xipp < sysinit_end; xipp++) {
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if ((*sipp)->subsystem < (*xipp)->subsystem ||
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((*sipp)->subsystem == (*xipp)->subsystem &&
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(*sipp)->order <= (*xipp)->order))
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continue; /* skip*/
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save = *sipp;
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*sipp = *xipp;
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*xipp = save;
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}
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}
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#if defined(VERBOSE_SYSINIT)
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last = SI_SUB_COPYRIGHT;
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verbose = 0;
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#if !defined(DDB)
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printf("VERBOSE_SYSINIT: DDB not enabled, symbol lookups disabled.\n");
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#endif
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#endif
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/*
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* Traverse the (now) ordered list of system initialization tasks.
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* Perform each task, and continue on to the next task.
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*/
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for (sipp = sysinit; sipp < sysinit_end; sipp++) {
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if ((*sipp)->subsystem == SI_SUB_DUMMY)
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continue; /* skip dummy task(s)*/
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if ((*sipp)->subsystem == SI_SUB_DONE)
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continue;
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#if defined(VERBOSE_SYSINIT)
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if ((*sipp)->subsystem > last) {
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verbose = 1;
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last = (*sipp)->subsystem;
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printf("subsystem %x\n", last);
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}
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if (verbose) {
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#if defined(DDB)
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const char *func, *data;
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func = symbol_name((vm_offset_t)(*sipp)->func,
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DB_STGY_PROC);
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data = symbol_name((vm_offset_t)(*sipp)->udata,
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DB_STGY_ANY);
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if (func != NULL && data != NULL)
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printf(" %s(&%s)... ", func, data);
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else if (func != NULL)
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printf(" %s(%p)... ", func, (*sipp)->udata);
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else
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#endif
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printf(" %p(%p)... ", (*sipp)->func,
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(*sipp)->udata);
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}
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#endif
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/* Call function */
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(*((*sipp)->func))((*sipp)->udata);
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#if defined(VERBOSE_SYSINIT)
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if (verbose)
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printf("done.\n");
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#endif
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/* Check off the one we're just done */
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(*sipp)->subsystem = SI_SUB_DONE;
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/* Check if we've installed more sysinit items via KLD */
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if (newsysinit != NULL) {
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if (sysinit != SET_BEGIN(sysinit_set))
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free(sysinit, M_TEMP);
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sysinit = newsysinit;
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sysinit_end = newsysinit_end;
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newsysinit = NULL;
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newsysinit_end = NULL;
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goto restart;
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}
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}
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TSEXIT(); /* Here so we don't overlap with start_init. */
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mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED);
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mtx_unlock(&Giant);
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/*
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* Now hand over this thread to swapper.
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*/
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swapper();
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/* NOTREACHED*/
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}
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static void
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print_caddr_t(void *data)
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{
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printf("%s", (char *)data);
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}
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static void
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print_version(void *data __unused)
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{
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int len;
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/* Strip a trailing newline from version. */
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len = strlen(version);
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while (len > 0 && version[len - 1] == '\n')
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len--;
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printf("%.*s %s\n", len, version, machine);
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printf("%s\n", compiler_version);
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}
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SYSINIT(announce, SI_SUB_COPYRIGHT, SI_ORDER_FIRST, print_caddr_t,
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copyright);
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SYSINIT(trademark, SI_SUB_COPYRIGHT, SI_ORDER_SECOND, print_caddr_t,
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trademark);
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SYSINIT(version, SI_SUB_COPYRIGHT, SI_ORDER_THIRD, print_version, NULL);
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#ifdef WITNESS
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static char wit_warn[] =
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"WARNING: WITNESS option enabled, expect reduced performance.\n";
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SYSINIT(witwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 1,
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print_caddr_t, wit_warn);
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SYSINIT(witwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 1,
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print_caddr_t, wit_warn);
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#endif
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#ifdef DIAGNOSTIC
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static char diag_warn[] =
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"WARNING: DIAGNOSTIC option enabled, expect reduced performance.\n";
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SYSINIT(diagwarn, SI_SUB_COPYRIGHT, SI_ORDER_THIRD + 2,
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print_caddr_t, diag_warn);
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SYSINIT(diagwarn2, SI_SUB_LAST, SI_ORDER_THIRD + 2,
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print_caddr_t, diag_warn);
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#endif
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static int
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null_fetch_syscall_args(struct thread *td __unused)
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{
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panic("null_fetch_syscall_args");
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}
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static void
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null_set_syscall_retval(struct thread *td __unused, int error __unused)
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{
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panic("null_set_syscall_retval");
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}
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struct sysentvec null_sysvec = {
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.sv_size = 0,
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.sv_table = NULL,
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.sv_mask = 0,
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.sv_errsize = 0,
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.sv_errtbl = NULL,
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.sv_transtrap = NULL,
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.sv_fixup = NULL,
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.sv_sendsig = NULL,
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.sv_sigcode = NULL,
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.sv_szsigcode = NULL,
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.sv_name = "null",
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.sv_coredump = NULL,
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.sv_imgact_try = NULL,
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.sv_minsigstksz = 0,
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.sv_pagesize = PAGE_SIZE,
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.sv_minuser = VM_MIN_ADDRESS,
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.sv_maxuser = VM_MAXUSER_ADDRESS,
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.sv_usrstack = USRSTACK,
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.sv_psstrings = PS_STRINGS,
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.sv_stackprot = VM_PROT_ALL,
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.sv_copyout_strings = NULL,
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.sv_setregs = NULL,
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.sv_fixlimit = NULL,
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.sv_maxssiz = NULL,
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.sv_flags = 0,
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.sv_set_syscall_retval = null_set_syscall_retval,
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.sv_fetch_syscall_args = null_fetch_syscall_args,
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.sv_syscallnames = NULL,
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.sv_schedtail = NULL,
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.sv_thread_detach = NULL,
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.sv_trap = NULL,
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};
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/*
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* The two following SYSINIT's are proc0 specific glue code. I am not
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* convinced that they can not be safely combined, but their order of
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* operation has been maintained as the same as the original init_main.c
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* for right now.
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*/
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/* ARGSUSED*/
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static void
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proc0_init(void *dummy __unused)
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{
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struct proc *p;
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struct thread *td;
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struct ucred *newcred;
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struct uidinfo tmpuinfo;
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struct loginclass tmplc = {
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.lc_name = "",
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};
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vm_paddr_t pageablemem;
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int i;
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GIANT_REQUIRED;
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p = &proc0;
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td = &thread0;
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/*
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* Initialize magic number and osrel.
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*/
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p->p_magic = P_MAGIC;
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p->p_osrel = osreldate;
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/*
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* Initialize thread and process structures.
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*/
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procinit(); /* set up proc zone */
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threadinit(); /* set up UMA zones */
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/*
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* Initialise scheduler resources.
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|
* Add scheduler specific parts to proc, thread as needed.
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*/
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schedinit(); /* scheduler gets its house in order */
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/*
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* Create process 0 (the swapper).
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*/
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LIST_INSERT_HEAD(&allproc, p, p_list);
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LIST_INSERT_HEAD(PIDHASH(0), p, p_hash);
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mtx_init(&pgrp0.pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK);
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p->p_pgrp = &pgrp0;
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LIST_INSERT_HEAD(PGRPHASH(0), &pgrp0, pg_hash);
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LIST_INIT(&pgrp0.pg_members);
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LIST_INSERT_HEAD(&pgrp0.pg_members, p, p_pglist);
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pgrp0.pg_session = &session0;
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mtx_init(&session0.s_mtx, "session", NULL, MTX_DEF);
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refcount_init(&session0.s_count, 1);
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session0.s_leader = p;
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p->p_sysent = &null_sysvec;
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p->p_flag = P_SYSTEM | P_INMEM | P_KPROC;
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p->p_flag2 = 0;
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p->p_state = PRS_NORMAL;
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p->p_klist = knlist_alloc(&p->p_mtx);
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STAILQ_INIT(&p->p_ktr);
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p->p_nice = NZERO;
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/* pid_max cannot be greater than PID_MAX */
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td->td_tid = PID_MAX + 1;
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LIST_INSERT_HEAD(TIDHASH(td->td_tid), td, td_hash);
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td->td_state = TDS_RUNNING;
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td->td_pri_class = PRI_TIMESHARE;
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td->td_user_pri = PUSER;
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td->td_base_user_pri = PUSER;
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td->td_lend_user_pri = PRI_MAX;
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td->td_priority = PVM;
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td->td_base_pri = PVM;
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td->td_oncpu = curcpu;
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td->td_flags = TDF_INMEM;
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td->td_pflags = TDP_KTHREAD;
|
|
td->td_cpuset = cpuset_thread0();
|
|
td->td_domain.dr_policy = td->td_cpuset->cs_domain;
|
|
prison0_init();
|
|
p->p_peers = 0;
|
|
p->p_leader = p;
|
|
p->p_reaper = p;
|
|
LIST_INIT(&p->p_reaplist);
|
|
|
|
strncpy(p->p_comm, "kernel", sizeof (p->p_comm));
|
|
strncpy(td->td_name, "swapper", sizeof (td->td_name));
|
|
|
|
callout_init_mtx(&p->p_itcallout, &p->p_mtx, 0);
|
|
callout_init_mtx(&p->p_limco, &p->p_mtx, 0);
|
|
callout_init(&td->td_slpcallout, 1);
|
|
|
|
/* Create credentials. */
|
|
newcred = crget();
|
|
newcred->cr_ngroups = 1; /* group 0 */
|
|
/* A hack to prevent uifind from tripping over NULL pointers. */
|
|
curthread->td_ucred = newcred;
|
|
tmpuinfo.ui_uid = 1;
|
|
newcred->cr_uidinfo = newcred->cr_ruidinfo = &tmpuinfo;
|
|
newcred->cr_uidinfo = uifind(0);
|
|
newcred->cr_ruidinfo = uifind(0);
|
|
newcred->cr_loginclass = &tmplc;
|
|
newcred->cr_loginclass = loginclass_find("default");
|
|
/* End hack. creds get properly set later with thread_cow_get_proc */
|
|
curthread->td_ucred = NULL;
|
|
newcred->cr_prison = &prison0;
|
|
proc_set_cred_init(p, newcred);
|
|
#ifdef AUDIT
|
|
audit_cred_kproc0(newcred);
|
|
#endif
|
|
#ifdef MAC
|
|
mac_cred_create_swapper(newcred);
|
|
#endif
|
|
/* Create sigacts. */
|
|
p->p_sigacts = sigacts_alloc();
|
|
|
|
/* Initialize signal state for process 0. */
|
|
siginit(&proc0);
|
|
|
|
/* Create the file descriptor table. */
|
|
p->p_fd = fdinit(NULL, false);
|
|
p->p_fdtol = NULL;
|
|
|
|
/* Create the limits structures. */
|
|
p->p_limit = lim_alloc();
|
|
for (i = 0; i < RLIM_NLIMITS; i++)
|
|
p->p_limit->pl_rlimit[i].rlim_cur =
|
|
p->p_limit->pl_rlimit[i].rlim_max = RLIM_INFINITY;
|
|
p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_cur =
|
|
p->p_limit->pl_rlimit[RLIMIT_NOFILE].rlim_max = maxfiles;
|
|
p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_cur =
|
|
p->p_limit->pl_rlimit[RLIMIT_NPROC].rlim_max = maxproc;
|
|
p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_cur = dfldsiz;
|
|
p->p_limit->pl_rlimit[RLIMIT_DATA].rlim_max = maxdsiz;
|
|
p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_cur = dflssiz;
|
|
p->p_limit->pl_rlimit[RLIMIT_STACK].rlim_max = maxssiz;
|
|
/* Cast to avoid overflow on i386/PAE. */
|
|
pageablemem = ptoa((vm_paddr_t)vm_cnt.v_free_count);
|
|
p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_cur =
|
|
p->p_limit->pl_rlimit[RLIMIT_RSS].rlim_max = pageablemem;
|
|
p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_cur = pageablemem / 3;
|
|
p->p_limit->pl_rlimit[RLIMIT_MEMLOCK].rlim_max = pageablemem;
|
|
p->p_cpulimit = RLIM_INFINITY;
|
|
|
|
PROC_LOCK(p);
|
|
thread_cow_get_proc(td, p);
|
|
PROC_UNLOCK(p);
|
|
|
|
/* Initialize resource accounting structures. */
|
|
racct_create(&p->p_racct);
|
|
|
|
p->p_stats = pstats_alloc();
|
|
|
|
/* Allocate a prototype map so we have something to fork. */
|
|
p->p_vmspace = &vmspace0;
|
|
vmspace0.vm_refcnt = 1;
|
|
pmap_pinit0(vmspace_pmap(&vmspace0));
|
|
|
|
/*
|
|
* proc0 is not expected to enter usermode, so there is no special
|
|
* handling for sv_minuser here, like is done for exec_new_vmspace().
|
|
*/
|
|
vm_map_init(&vmspace0.vm_map, vmspace_pmap(&vmspace0),
|
|
p->p_sysent->sv_minuser, p->p_sysent->sv_maxuser);
|
|
|
|
/*
|
|
* Call the init and ctor for the new thread and proc. We wait
|
|
* to do this until all other structures are fairly sane.
|
|
*/
|
|
EVENTHANDLER_DIRECT_INVOKE(process_init, p);
|
|
EVENTHANDLER_DIRECT_INVOKE(thread_init, td);
|
|
EVENTHANDLER_DIRECT_INVOKE(process_ctor, p);
|
|
EVENTHANDLER_DIRECT_INVOKE(thread_ctor, td);
|
|
|
|
/*
|
|
* Charge root for one process.
|
|
*/
|
|
(void)chgproccnt(p->p_ucred->cr_ruidinfo, 1, 0);
|
|
PROC_LOCK(p);
|
|
racct_add_force(p, RACCT_NPROC, 1);
|
|
PROC_UNLOCK(p);
|
|
}
|
|
SYSINIT(p0init, SI_SUB_INTRINSIC, SI_ORDER_FIRST, proc0_init, NULL);
|
|
|
|
/* ARGSUSED*/
|
|
static void
|
|
proc0_post(void *dummy __unused)
|
|
{
|
|
struct timespec ts;
|
|
struct proc *p;
|
|
struct rusage ru;
|
|
struct thread *td;
|
|
|
|
/*
|
|
* Now we can look at the time, having had a chance to verify the
|
|
* time from the filesystem. Pretend that proc0 started now.
|
|
*/
|
|
sx_slock(&allproc_lock);
|
|
FOREACH_PROC_IN_SYSTEM(p) {
|
|
microuptime(&p->p_stats->p_start);
|
|
PROC_STATLOCK(p);
|
|
rufetch(p, &ru); /* Clears thread stats */
|
|
PROC_STATUNLOCK(p);
|
|
p->p_rux.rux_runtime = 0;
|
|
p->p_rux.rux_uticks = 0;
|
|
p->p_rux.rux_sticks = 0;
|
|
p->p_rux.rux_iticks = 0;
|
|
FOREACH_THREAD_IN_PROC(p, td) {
|
|
td->td_runtime = 0;
|
|
}
|
|
}
|
|
sx_sunlock(&allproc_lock);
|
|
PCPU_SET(switchtime, cpu_ticks());
|
|
PCPU_SET(switchticks, ticks);
|
|
|
|
/*
|
|
* Give the ``random'' number generator a thump.
|
|
*/
|
|
nanotime(&ts);
|
|
srandom(ts.tv_sec ^ ts.tv_nsec);
|
|
}
|
|
SYSINIT(p0post, SI_SUB_INTRINSIC_POST, SI_ORDER_FIRST, proc0_post, NULL);
|
|
|
|
static void
|
|
random_init(void *dummy __unused)
|
|
{
|
|
|
|
/*
|
|
* After CPU has been started we have some randomness on most
|
|
* platforms via get_cyclecount(). For platforms that don't
|
|
* we will reseed random(9) in proc0_post() as well.
|
|
*/
|
|
srandom(get_cyclecount());
|
|
}
|
|
SYSINIT(random, SI_SUB_RANDOM, SI_ORDER_FIRST, random_init, NULL);
|
|
|
|
/*
|
|
***************************************************************************
|
|
****
|
|
**** The following SYSINIT's and glue code should be moved to the
|
|
**** respective files on a per subsystem basis.
|
|
****
|
|
***************************************************************************
|
|
*/
|
|
|
|
/*
|
|
* List of paths to try when searching for "init".
|
|
*/
|
|
static char init_path[MAXPATHLEN] =
|
|
#ifdef INIT_PATH
|
|
__XSTRING(INIT_PATH);
|
|
#else
|
|
"/sbin/init:/sbin/oinit:/sbin/init.bak:/rescue/init";
|
|
#endif
|
|
SYSCTL_STRING(_kern, OID_AUTO, init_path, CTLFLAG_RD, init_path, 0,
|
|
"Path used to search the init process");
|
|
|
|
/*
|
|
* Shutdown timeout of init(8).
|
|
* Unused within kernel, but used to control init(8), hence do not remove.
|
|
*/
|
|
#ifndef INIT_SHUTDOWN_TIMEOUT
|
|
#define INIT_SHUTDOWN_TIMEOUT 120
|
|
#endif
|
|
static int init_shutdown_timeout = INIT_SHUTDOWN_TIMEOUT;
|
|
SYSCTL_INT(_kern, OID_AUTO, init_shutdown_timeout,
|
|
CTLFLAG_RW, &init_shutdown_timeout, 0, "Shutdown timeout of init(8). "
|
|
"Unused within kernel, but used to control init(8)");
|
|
|
|
/*
|
|
* Start the initial user process; try exec'ing each pathname in init_path.
|
|
* The program is invoked with one argument containing the boot flags.
|
|
*/
|
|
static void
|
|
start_init(void *dummy)
|
|
{
|
|
vm_offset_t addr;
|
|
struct execve_args args;
|
|
int options, error;
|
|
char *var, *path, *next, *s;
|
|
char *ucp, **uap, *arg0, *arg1;
|
|
struct thread *td;
|
|
struct proc *p;
|
|
|
|
mtx_lock(&Giant);
|
|
|
|
GIANT_REQUIRED;
|
|
|
|
TSENTER(); /* Here so we don't overlap with mi_startup. */
|
|
|
|
td = curthread;
|
|
p = td->td_proc;
|
|
|
|
vfs_mountroot();
|
|
|
|
/* Wipe GELI passphrase from the environment. */
|
|
kern_unsetenv("kern.geom.eli.passphrase");
|
|
|
|
/*
|
|
* Need just enough stack to hold the faked-up "execve()" arguments.
|
|
*/
|
|
addr = p->p_sysent->sv_usrstack - PAGE_SIZE;
|
|
if (vm_map_find(&p->p_vmspace->vm_map, NULL, 0, &addr, PAGE_SIZE, 0,
|
|
VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0) != 0)
|
|
panic("init: couldn't allocate argument space");
|
|
p->p_vmspace->vm_maxsaddr = (caddr_t)addr;
|
|
p->p_vmspace->vm_ssize = 1;
|
|
|
|
if ((var = kern_getenv("init_path")) != NULL) {
|
|
strlcpy(init_path, var, sizeof(init_path));
|
|
freeenv(var);
|
|
}
|
|
|
|
for (path = init_path; *path != '\0'; path = next) {
|
|
while (*path == ':')
|
|
path++;
|
|
if (*path == '\0')
|
|
break;
|
|
for (next = path; *next != '\0' && *next != ':'; next++)
|
|
/* nothing */ ;
|
|
if (bootverbose)
|
|
printf("start_init: trying %.*s\n", (int)(next - path),
|
|
path);
|
|
|
|
/*
|
|
* Move out the boot flag argument.
|
|
*/
|
|
options = 0;
|
|
ucp = (char *)p->p_sysent->sv_usrstack;
|
|
(void)subyte(--ucp, 0); /* trailing zero */
|
|
if (boothowto & RB_SINGLE) {
|
|
(void)subyte(--ucp, 's');
|
|
options = 1;
|
|
}
|
|
#ifdef notyet
|
|
if (boothowto & RB_FASTBOOT) {
|
|
(void)subyte(--ucp, 'f');
|
|
options = 1;
|
|
}
|
|
#endif
|
|
|
|
#ifdef BOOTCDROM
|
|
(void)subyte(--ucp, 'C');
|
|
options = 1;
|
|
#endif
|
|
|
|
if (options == 0)
|
|
(void)subyte(--ucp, '-');
|
|
(void)subyte(--ucp, '-'); /* leading hyphen */
|
|
arg1 = ucp;
|
|
|
|
/*
|
|
* Move out the file name (also arg 0).
|
|
*/
|
|
(void)subyte(--ucp, 0);
|
|
for (s = next - 1; s >= path; s--)
|
|
(void)subyte(--ucp, *s);
|
|
arg0 = ucp;
|
|
|
|
/*
|
|
* Move out the arg pointers.
|
|
*/
|
|
uap = (char **)rounddown2((intptr_t)ucp, sizeof(intptr_t));
|
|
(void)suword((caddr_t)--uap, (long)0); /* terminator */
|
|
(void)suword((caddr_t)--uap, (long)(intptr_t)arg1);
|
|
(void)suword((caddr_t)--uap, (long)(intptr_t)arg0);
|
|
|
|
/*
|
|
* Point at the arguments.
|
|
*/
|
|
args.fname = arg0;
|
|
args.argv = uap;
|
|
args.envv = NULL;
|
|
|
|
/*
|
|
* Now try to exec the program. If can't for any reason
|
|
* other than it doesn't exist, complain.
|
|
*
|
|
* Otherwise, return via fork_trampoline() all the way
|
|
* to user mode as init!
|
|
*/
|
|
if ((error = sys_execve(td, &args)) == EJUSTRETURN) {
|
|
mtx_unlock(&Giant);
|
|
TSEXIT();
|
|
return;
|
|
}
|
|
if (error != ENOENT)
|
|
printf("exec %.*s: error %d\n", (int)(next - path),
|
|
path, error);
|
|
}
|
|
printf("init: not found in path %s\n", init_path);
|
|
panic("no init");
|
|
}
|
|
|
|
/*
|
|
* Like kproc_create(), but runs in its own address space.
|
|
* We do this early to reserve pid 1.
|
|
*
|
|
* Note special case - do not make it runnable yet. Other work
|
|
* in progress will change this more.
|
|
*/
|
|
static void
|
|
create_init(const void *udata __unused)
|
|
{
|
|
struct fork_req fr;
|
|
struct ucred *newcred, *oldcred;
|
|
struct thread *td;
|
|
int error;
|
|
|
|
bzero(&fr, sizeof(fr));
|
|
fr.fr_flags = RFFDG | RFPROC | RFSTOPPED;
|
|
fr.fr_procp = &initproc;
|
|
error = fork1(&thread0, &fr);
|
|
if (error)
|
|
panic("cannot fork init: %d\n", error);
|
|
KASSERT(initproc->p_pid == 1, ("create_init: initproc->p_pid != 1"));
|
|
/* divorce init's credentials from the kernel's */
|
|
newcred = crget();
|
|
sx_xlock(&proctree_lock);
|
|
PROC_LOCK(initproc);
|
|
initproc->p_flag |= P_SYSTEM | P_INMEM;
|
|
initproc->p_treeflag |= P_TREE_REAPER;
|
|
LIST_INSERT_HEAD(&initproc->p_reaplist, &proc0, p_reapsibling);
|
|
oldcred = initproc->p_ucred;
|
|
crcopy(newcred, oldcred);
|
|
#ifdef MAC
|
|
mac_cred_create_init(newcred);
|
|
#endif
|
|
#ifdef AUDIT
|
|
audit_cred_proc1(newcred);
|
|
#endif
|
|
proc_set_cred(initproc, newcred);
|
|
td = FIRST_THREAD_IN_PROC(initproc);
|
|
crfree(td->td_ucred);
|
|
td->td_ucred = crhold(initproc->p_ucred);
|
|
PROC_UNLOCK(initproc);
|
|
sx_xunlock(&proctree_lock);
|
|
crfree(oldcred);
|
|
cpu_fork_kthread_handler(FIRST_THREAD_IN_PROC(initproc),
|
|
start_init, NULL);
|
|
}
|
|
SYSINIT(init, SI_SUB_CREATE_INIT, SI_ORDER_FIRST, create_init, NULL);
|
|
|
|
/*
|
|
* Make it runnable now.
|
|
*/
|
|
static void
|
|
kick_init(const void *udata __unused)
|
|
{
|
|
struct thread *td;
|
|
|
|
td = FIRST_THREAD_IN_PROC(initproc);
|
|
thread_lock(td);
|
|
TD_SET_CAN_RUN(td);
|
|
sched_add(td, SRQ_BORING);
|
|
thread_unlock(td);
|
|
}
|
|
SYSINIT(kickinit, SI_SUB_KTHREAD_INIT, SI_ORDER_MIDDLE, kick_init, NULL);
|