300d4098cf
system calls now enter without Giant held, and then in some cases, acquire Giant explicitly. Remove a number of other MPSAFE annotations in the credential code and tweak one or two other adjacent comments.
1996 lines
47 KiB
C
1996 lines
47 KiB
C
/*-
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* Copyright (c) 1997-2000 Doug Rabson
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include "opt_hwpmc_hooks.h"
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#include "opt_mac.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/sysproto.h>
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#include <sys/sysent.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/sx.h>
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#include <sys/module.h>
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#include <sys/mount.h>
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#include <sys/linker.h>
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#include <sys/fcntl.h>
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#include <sys/libkern.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysctl.h>
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#include <security/mac/mac_framework.h>
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#include "linker_if.h"
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#ifdef HWPMC_HOOKS
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#include <sys/pmckern.h>
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#endif
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#ifdef KLD_DEBUG
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int kld_debug = 0;
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#endif
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#define KLD_LOCK() sx_xlock(&kld_sx)
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#define KLD_UNLOCK() sx_xunlock(&kld_sx)
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#define KLD_LOCKED() sx_xlocked(&kld_sx)
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#define KLD_LOCK_ASSERT() do { \
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if (!cold) \
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sx_assert(&kld_sx, SX_XLOCKED); \
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} while (0)
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/*
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* static char *linker_search_path(const char *name, struct mod_depend
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* *verinfo);
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*/
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static const char *linker_basename(const char *path);
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/*
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* Find a currently loaded file given its filename.
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*/
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static linker_file_t linker_find_file_by_name(const char* _filename);
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/*
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* Find a currently loaded file given its file id.
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*/
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static linker_file_t linker_find_file_by_id(int _fileid);
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/* Metadata from the static kernel */
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SET_DECLARE(modmetadata_set, struct mod_metadata);
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MALLOC_DEFINE(M_LINKER, "linker", "kernel linker");
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linker_file_t linker_kernel_file;
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static struct sx kld_sx; /* kernel linker lock */
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static linker_class_list_t classes;
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static linker_file_list_t linker_files;
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static int next_file_id = 1;
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static int linker_no_more_classes = 0;
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#define LINKER_GET_NEXT_FILE_ID(a) do { \
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linker_file_t lftmp; \
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\
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KLD_LOCK_ASSERT(); \
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retry: \
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TAILQ_FOREACH(lftmp, &linker_files, link) { \
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if (next_file_id == lftmp->id) { \
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next_file_id++; \
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goto retry; \
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} \
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} \
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(a) = next_file_id; \
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} while(0)
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/* XXX wrong name; we're looking at version provision tags here, not modules */
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typedef TAILQ_HEAD(, modlist) modlisthead_t;
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struct modlist {
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TAILQ_ENTRY(modlist) link; /* chain together all modules */
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linker_file_t container;
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const char *name;
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int version;
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};
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typedef struct modlist *modlist_t;
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static modlisthead_t found_modules;
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static int linker_file_add_dependency(linker_file_t file,
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linker_file_t dep);
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static caddr_t linker_file_lookup_symbol_internal(linker_file_t file,
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const char* name, int deps);
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static int linker_load_module(const char *kldname,
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const char *modname, struct linker_file *parent,
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struct mod_depend *verinfo, struct linker_file **lfpp);
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static modlist_t modlist_lookup2(const char *name, struct mod_depend *verinfo);
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static char *
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linker_strdup(const char *str)
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{
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char *result;
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if ((result = malloc((strlen(str) + 1), M_LINKER, M_WAITOK)) != NULL)
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strcpy(result, str);
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return (result);
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}
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static void
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linker_init(void *arg)
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{
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sx_init(&kld_sx, "kernel linker");
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TAILQ_INIT(&classes);
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TAILQ_INIT(&linker_files);
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}
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SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0)
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static void
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linker_stop_class_add(void *arg)
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{
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linker_no_more_classes = 1;
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}
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SYSINIT(linker_class, SI_SUB_KLD, SI_ORDER_ANY, linker_stop_class_add, NULL)
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int
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linker_add_class(linker_class_t lc)
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{
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/*
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* We disallow any class registration past SI_ORDER_ANY
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* of SI_SUB_KLD. We bump the reference count to keep the
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* ops from being freed.
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*/
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if (linker_no_more_classes == 1)
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return (EPERM);
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kobj_class_compile((kobj_class_t) lc);
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((kobj_class_t)lc)->refs++; /* XXX: kobj_mtx */
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TAILQ_INSERT_TAIL(&classes, lc, link);
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return (0);
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}
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static void
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linker_file_sysinit(linker_file_t lf)
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{
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struct sysinit **start, **stop, **sipp, **xipp, *save;
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KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n",
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lf->filename));
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if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0)
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return;
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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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* Since some things care about execution order, this is the operation
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* which ensures continued function.
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*/
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for (sipp = start; sipp < stop; sipp++) {
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for (xipp = sipp + 1; xipp < stop; 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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/*
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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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mtx_lock(&Giant);
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for (sipp = start; sipp < stop; sipp++) {
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if ((*sipp)->subsystem == SI_SUB_DUMMY)
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continue; /* skip dummy task(s) */
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/* Call function */
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(*((*sipp)->func)) ((*sipp)->udata);
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}
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mtx_unlock(&Giant);
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}
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static void
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linker_file_sysuninit(linker_file_t lf)
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{
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struct sysinit **start, **stop, **sipp, **xipp, *save;
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KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n",
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lf->filename));
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if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop,
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NULL) != 0)
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return;
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/*
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* Perform a reverse bubble sort of the system initialization objects
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* by their subsystem (primary key) and order (secondary key).
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*
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* Since some things care about execution order, this is the operation
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* which ensures continued function.
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*/
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for (sipp = start; sipp < stop; sipp++) {
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for (xipp = sipp + 1; xipp < stop; 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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/*
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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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mtx_lock(&Giant);
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for (sipp = start; sipp < stop; sipp++) {
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if ((*sipp)->subsystem == SI_SUB_DUMMY)
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continue; /* skip dummy task(s) */
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/* Call function */
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(*((*sipp)->func)) ((*sipp)->udata);
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}
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mtx_unlock(&Giant);
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}
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static void
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linker_file_register_sysctls(linker_file_t lf)
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{
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struct sysctl_oid **start, **stop, **oidp;
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KLD_DPF(FILE,
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("linker_file_register_sysctls: registering SYSCTLs for %s\n",
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lf->filename));
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if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
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return;
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mtx_lock(&Giant);
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for (oidp = start; oidp < stop; oidp++)
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sysctl_register_oid(*oidp);
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mtx_unlock(&Giant);
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}
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static void
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linker_file_unregister_sysctls(linker_file_t lf)
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{
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struct sysctl_oid **start, **stop, **oidp;
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KLD_DPF(FILE, ("linker_file_unregister_sysctls: registering SYSCTLs"
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" for %s\n", lf->filename));
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if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
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return;
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mtx_lock(&Giant);
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for (oidp = start; oidp < stop; oidp++)
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sysctl_unregister_oid(*oidp);
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mtx_unlock(&Giant);
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}
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static int
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linker_file_register_modules(linker_file_t lf)
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{
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struct mod_metadata **start, **stop, **mdp;
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const moduledata_t *moddata;
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int first_error, error;
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KLD_DPF(FILE, ("linker_file_register_modules: registering modules"
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" in %s\n", lf->filename));
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if (linker_file_lookup_set(lf, "modmetadata_set", &start,
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&stop, NULL) != 0) {
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/*
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* This fallback should be unnecessary, but if we get booted
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* from boot2 instead of loader and we are missing our
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* metadata then we have to try the best we can.
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*/
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if (lf == linker_kernel_file) {
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start = SET_BEGIN(modmetadata_set);
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stop = SET_LIMIT(modmetadata_set);
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} else
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return (0);
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}
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first_error = 0;
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for (mdp = start; mdp < stop; mdp++) {
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if ((*mdp)->md_type != MDT_MODULE)
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continue;
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moddata = (*mdp)->md_data;
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KLD_DPF(FILE, ("Registering module %s in %s\n",
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moddata->name, lf->filename));
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error = module_register(moddata, lf);
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if (error) {
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printf("Module %s failed to register: %d\n",
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moddata->name, error);
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if (first_error == 0)
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first_error = error;
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}
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}
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return (first_error);
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}
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static void
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linker_init_kernel_modules(void)
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{
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linker_file_register_modules(linker_kernel_file);
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}
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SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules, 0)
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static int
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linker_load_file(const char *filename, linker_file_t *result)
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{
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linker_class_t lc;
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linker_file_t lf;
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int foundfile, error;
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/* Refuse to load modules if securelevel raised */
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if (securelevel > 0)
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return (EPERM);
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KLD_LOCK_ASSERT();
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lf = linker_find_file_by_name(filename);
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if (lf) {
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KLD_DPF(FILE, ("linker_load_file: file %s is already loaded,"
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" incrementing refs\n", filename));
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*result = lf;
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lf->refs++;
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return (0);
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}
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foundfile = 0;
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error = 0;
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/*
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* We do not need to protect (lock) classes here because there is
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* no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY)
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* and there is no class deregistration mechanism at this time.
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*/
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TAILQ_FOREACH(lc, &classes, link) {
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KLD_DPF(FILE, ("linker_load_file: trying to load %s\n",
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filename));
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error = LINKER_LOAD_FILE(lc, filename, &lf);
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/*
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* If we got something other than ENOENT, then it exists but
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* we cannot load it for some other reason.
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*/
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if (error != ENOENT)
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foundfile = 1;
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if (lf) {
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error = linker_file_register_modules(lf);
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if (error == EEXIST) {
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linker_file_unload(lf, LINKER_UNLOAD_FORCE);
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return (error);
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}
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KLD_UNLOCK();
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linker_file_register_sysctls(lf);
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linker_file_sysinit(lf);
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KLD_LOCK();
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lf->flags |= LINKER_FILE_LINKED;
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*result = lf;
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return (0);
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}
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}
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/*
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* Less than ideal, but tells the user whether it failed to load or
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* the module was not found.
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*/
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if (foundfile) {
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/*
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* Format not recognized or otherwise unloadable.
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* When loading a module that is statically built into
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* the kernel EEXIST percolates back up as the return
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* value. Preserve this so that apps like sysinstall
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* can recognize this special case and not post bogus
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* dialog boxes.
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*/
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if (error != EEXIST)
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error = ENOEXEC;
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} else
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error = ENOENT; /* Nothing found */
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return (error);
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}
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int
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linker_reference_module(const char *modname, struct mod_depend *verinfo,
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linker_file_t *result)
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{
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modlist_t mod;
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int error;
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KLD_LOCK();
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if ((mod = modlist_lookup2(modname, verinfo)) != NULL) {
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*result = mod->container;
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(*result)->refs++;
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KLD_UNLOCK();
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return (0);
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}
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error = linker_load_module(NULL, modname, NULL, verinfo, result);
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KLD_UNLOCK();
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return (error);
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}
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int
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linker_release_module(const char *modname, struct mod_depend *verinfo,
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linker_file_t lf)
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{
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modlist_t mod;
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int error;
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KLD_LOCK();
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if (lf == NULL) {
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KASSERT(modname != NULL,
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("linker_release_module: no file or name"));
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mod = modlist_lookup2(modname, verinfo);
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if (mod == NULL) {
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KLD_UNLOCK();
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return (ESRCH);
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}
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lf = mod->container;
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} else
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KASSERT(modname == NULL && verinfo == NULL,
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("linker_release_module: both file and name"));
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error = linker_file_unload(lf, LINKER_UNLOAD_NORMAL);
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KLD_UNLOCK();
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return (error);
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}
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static linker_file_t
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linker_find_file_by_name(const char *filename)
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{
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linker_file_t lf;
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char *koname;
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koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK);
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sprintf(koname, "%s.ko", filename);
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KLD_LOCK_ASSERT();
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TAILQ_FOREACH(lf, &linker_files, link) {
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if (strcmp(lf->filename, koname) == 0)
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break;
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if (strcmp(lf->filename, filename) == 0)
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break;
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}
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free(koname, M_LINKER);
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return (lf);
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}
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static linker_file_t
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linker_find_file_by_id(int fileid)
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{
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linker_file_t lf;
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KLD_LOCK_ASSERT();
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TAILQ_FOREACH(lf, &linker_files, link)
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if (lf->id == fileid && lf->flags & LINKER_FILE_LINKED)
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break;
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return (lf);
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}
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int
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linker_file_foreach(linker_predicate_t *predicate, void *context)
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{
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linker_file_t lf;
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int retval = 0;
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KLD_LOCK();
|
|
TAILQ_FOREACH(lf, &linker_files, link) {
|
|
retval = predicate(lf, context);
|
|
if (retval != 0)
|
|
break;
|
|
}
|
|
KLD_UNLOCK();
|
|
return (retval);
|
|
}
|
|
|
|
linker_file_t
|
|
linker_make_file(const char *pathname, linker_class_t lc)
|
|
{
|
|
linker_file_t lf;
|
|
const char *filename;
|
|
|
|
KLD_LOCK_ASSERT();
|
|
filename = linker_basename(pathname);
|
|
|
|
KLD_DPF(FILE, ("linker_make_file: new file, filename=%s\n", filename));
|
|
lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK);
|
|
if (lf == NULL)
|
|
return (NULL);
|
|
lf->refs = 1;
|
|
lf->userrefs = 0;
|
|
lf->flags = 0;
|
|
lf->filename = linker_strdup(filename);
|
|
LINKER_GET_NEXT_FILE_ID(lf->id);
|
|
lf->ndeps = 0;
|
|
lf->deps = NULL;
|
|
STAILQ_INIT(&lf->common);
|
|
TAILQ_INIT(&lf->modules);
|
|
TAILQ_INSERT_TAIL(&linker_files, lf, link);
|
|
return (lf);
|
|
}
|
|
|
|
int
|
|
linker_file_unload(linker_file_t file, int flags)
|
|
{
|
|
module_t mod, next;
|
|
modlist_t ml, nextml;
|
|
struct common_symbol *cp;
|
|
int error, i;
|
|
|
|
/* Refuse to unload modules if securelevel raised. */
|
|
if (securelevel > 0)
|
|
return (EPERM);
|
|
#ifdef MAC
|
|
error = mac_check_kld_unload(curthread->td_ucred);
|
|
if (error)
|
|
return (error);
|
|
#endif
|
|
|
|
KLD_LOCK_ASSERT();
|
|
KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs));
|
|
|
|
/* Easy case of just dropping a reference. */
|
|
if (file->refs > 1) {
|
|
file->refs--;
|
|
return (0);
|
|
}
|
|
|
|
KLD_DPF(FILE, ("linker_file_unload: file is unloading,"
|
|
" informing modules\n"));
|
|
|
|
/*
|
|
* Inform any modules associated with this file.
|
|
*/
|
|
MOD_XLOCK;
|
|
for (mod = TAILQ_FIRST(&file->modules); mod; mod = next) {
|
|
next = module_getfnext(mod);
|
|
MOD_XUNLOCK;
|
|
|
|
/*
|
|
* Give the module a chance to veto the unload.
|
|
*/
|
|
if ((error = module_unload(mod, flags)) != 0) {
|
|
KLD_DPF(FILE, ("linker_file_unload: module %p"
|
|
" vetoes unload\n", mod));
|
|
return (error);
|
|
}
|
|
MOD_XLOCK;
|
|
module_release(mod);
|
|
}
|
|
MOD_XUNLOCK;
|
|
|
|
TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml) {
|
|
if (ml->container == file) {
|
|
TAILQ_REMOVE(&found_modules, ml, link);
|
|
free(ml, M_LINKER);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Don't try to run SYSUNINITs if we are unloaded due to a
|
|
* link error.
|
|
*/
|
|
if (file->flags & LINKER_FILE_LINKED) {
|
|
linker_file_sysuninit(file);
|
|
linker_file_unregister_sysctls(file);
|
|
}
|
|
TAILQ_REMOVE(&linker_files, file, link);
|
|
|
|
if (file->deps) {
|
|
for (i = 0; i < file->ndeps; i++)
|
|
linker_file_unload(file->deps[i], flags);
|
|
free(file->deps, M_LINKER);
|
|
file->deps = NULL;
|
|
}
|
|
while ((cp = STAILQ_FIRST(&file->common)) != NULL) {
|
|
STAILQ_REMOVE_HEAD(&file->common, link);
|
|
free(cp, M_LINKER);
|
|
}
|
|
|
|
LINKER_UNLOAD(file);
|
|
if (file->filename) {
|
|
free(file->filename, M_LINKER);
|
|
file->filename = NULL;
|
|
}
|
|
kobj_delete((kobj_t) file, M_LINKER);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
linker_file_add_dependency(linker_file_t file, linker_file_t dep)
|
|
{
|
|
linker_file_t *newdeps;
|
|
|
|
KLD_LOCK_ASSERT();
|
|
newdeps = malloc((file->ndeps + 1) * sizeof(linker_file_t *),
|
|
M_LINKER, M_WAITOK | M_ZERO);
|
|
if (newdeps == NULL)
|
|
return (ENOMEM);
|
|
|
|
if (file->deps) {
|
|
bcopy(file->deps, newdeps,
|
|
file->ndeps * sizeof(linker_file_t *));
|
|
free(file->deps, M_LINKER);
|
|
}
|
|
file->deps = newdeps;
|
|
file->deps[file->ndeps] = dep;
|
|
file->ndeps++;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Locate a linker set and its contents. This is a helper function to avoid
|
|
* linker_if.h exposure elsewhere. Note: firstp and lastp are really void **.
|
|
* This function is used in this file so we can avoid having lots of (void **)
|
|
* casts.
|
|
*/
|
|
int
|
|
linker_file_lookup_set(linker_file_t file, const char *name,
|
|
void *firstp, void *lastp, int *countp)
|
|
{
|
|
int error, locked;
|
|
|
|
locked = KLD_LOCKED();
|
|
if (!locked)
|
|
KLD_LOCK();
|
|
error = LINKER_LOOKUP_SET(file, name, firstp, lastp, countp);
|
|
if (!locked)
|
|
KLD_UNLOCK();
|
|
return (error);
|
|
}
|
|
|
|
caddr_t
|
|
linker_file_lookup_symbol(linker_file_t file, const char *name, int deps)
|
|
{
|
|
caddr_t sym;
|
|
int locked;
|
|
|
|
locked = KLD_LOCKED();
|
|
if (!locked)
|
|
KLD_LOCK();
|
|
sym = linker_file_lookup_symbol_internal(file, name, deps);
|
|
if (!locked)
|
|
KLD_UNLOCK();
|
|
return (sym);
|
|
}
|
|
|
|
static caddr_t
|
|
linker_file_lookup_symbol_internal(linker_file_t file, const char *name,
|
|
int deps)
|
|
{
|
|
c_linker_sym_t sym;
|
|
linker_symval_t symval;
|
|
caddr_t address;
|
|
size_t common_size = 0;
|
|
int i;
|
|
|
|
KLD_LOCK_ASSERT();
|
|
KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n",
|
|
file, name, deps));
|
|
|
|
if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) {
|
|
LINKER_SYMBOL_VALUES(file, sym, &symval);
|
|
if (symval.value == 0)
|
|
/*
|
|
* For commons, first look them up in the
|
|
* dependencies and only allocate space if not found
|
|
* there.
|
|
*/
|
|
common_size = symval.size;
|
|
else {
|
|
KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol"
|
|
".value=%p\n", symval.value));
|
|
return (symval.value);
|
|
}
|
|
}
|
|
if (deps) {
|
|
for (i = 0; i < file->ndeps; i++) {
|
|
address = linker_file_lookup_symbol_internal(
|
|
file->deps[i], name, 0);
|
|
if (address) {
|
|
KLD_DPF(SYM, ("linker_file_lookup_symbol:"
|
|
" deps value=%p\n", address));
|
|
return (address);
|
|
}
|
|
}
|
|
}
|
|
if (common_size > 0) {
|
|
/*
|
|
* This is a common symbol which was not found in the
|
|
* dependencies. We maintain a simple common symbol table in
|
|
* the file object.
|
|
*/
|
|
struct common_symbol *cp;
|
|
|
|
STAILQ_FOREACH(cp, &file->common, link) {
|
|
if (strcmp(cp->name, name) == 0) {
|
|
KLD_DPF(SYM, ("linker_file_lookup_symbol:"
|
|
" old common value=%p\n", cp->address));
|
|
return (cp->address);
|
|
}
|
|
}
|
|
/*
|
|
* Round the symbol size up to align.
|
|
*/
|
|
common_size = (common_size + sizeof(int) - 1) & -sizeof(int);
|
|
cp = malloc(sizeof(struct common_symbol)
|
|
+ common_size + strlen(name) + 1, M_LINKER,
|
|
M_WAITOK | M_ZERO);
|
|
cp->address = (caddr_t)(cp + 1);
|
|
cp->name = cp->address + common_size;
|
|
strcpy(cp->name, name);
|
|
bzero(cp->address, common_size);
|
|
STAILQ_INSERT_TAIL(&file->common, cp, link);
|
|
|
|
KLD_DPF(SYM, ("linker_file_lookup_symbol: new common"
|
|
" value=%p\n", cp->address));
|
|
return (cp->address);
|
|
}
|
|
KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n"));
|
|
return (0);
|
|
}
|
|
|
|
#ifdef DDB
|
|
/*
|
|
* DDB Helpers. DDB has to look across multiple files with their own symbol
|
|
* tables and string tables.
|
|
*
|
|
* Note that we do not obey list locking protocols here. We really don't need
|
|
* DDB to hang because somebody's got the lock held. We'll take the chance
|
|
* that the files list is inconsistant instead.
|
|
*/
|
|
|
|
int
|
|
linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym)
|
|
{
|
|
linker_file_t lf;
|
|
|
|
TAILQ_FOREACH(lf, &linker_files, link) {
|
|
if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0)
|
|
return (0);
|
|
}
|
|
return (ENOENT);
|
|
}
|
|
|
|
int
|
|
linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
|
|
{
|
|
linker_file_t lf;
|
|
c_linker_sym_t best, es;
|
|
u_long diff, bestdiff, off;
|
|
|
|
best = 0;
|
|
off = (uintptr_t)value;
|
|
bestdiff = off;
|
|
TAILQ_FOREACH(lf, &linker_files, link) {
|
|
if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0)
|
|
continue;
|
|
if (es != 0 && diff < bestdiff) {
|
|
best = es;
|
|
bestdiff = diff;
|
|
}
|
|
if (bestdiff == 0)
|
|
break;
|
|
}
|
|
if (best) {
|
|
*sym = best;
|
|
*diffp = bestdiff;
|
|
return (0);
|
|
} else {
|
|
*sym = 0;
|
|
*diffp = off;
|
|
return (ENOENT);
|
|
}
|
|
}
|
|
|
|
int
|
|
linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
|
|
{
|
|
linker_file_t lf;
|
|
|
|
TAILQ_FOREACH(lf, &linker_files, link) {
|
|
if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0)
|
|
return (0);
|
|
}
|
|
return (ENOENT);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Syscalls.
|
|
*/
|
|
int
|
|
kern_kldload(struct thread *td, const char *file, int *fileid)
|
|
{
|
|
#ifdef HWPMC_HOOKS
|
|
struct pmckern_map_in pkm;
|
|
#endif
|
|
const char *kldname, *modname;
|
|
linker_file_t lf;
|
|
int error;
|
|
|
|
if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
|
|
return (error);
|
|
|
|
if ((error = priv_check(td, PRIV_KLD_LOAD)) != 0)
|
|
return (error);
|
|
|
|
/*
|
|
* If file does not contain a qualified name or any dot in it
|
|
* (kldname.ko, or kldname.ver.ko) treat it as an interface
|
|
* name.
|
|
*/
|
|
if (index(file, '/') || index(file, '.')) {
|
|
kldname = file;
|
|
modname = NULL;
|
|
} else {
|
|
kldname = NULL;
|
|
modname = file;
|
|
}
|
|
|
|
KLD_LOCK();
|
|
error = linker_load_module(kldname, modname, NULL, NULL, &lf);
|
|
if (error)
|
|
goto unlock;
|
|
#ifdef HWPMC_HOOKS
|
|
pkm.pm_file = lf->filename;
|
|
pkm.pm_address = (uintptr_t) lf->address;
|
|
PMC_CALL_HOOK(td, PMC_FN_KLD_LOAD, (void *) &pkm);
|
|
#endif
|
|
lf->userrefs++;
|
|
if (fileid != NULL)
|
|
*fileid = lf->id;
|
|
unlock:
|
|
KLD_UNLOCK();
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kldload(struct thread *td, struct kldload_args *uap)
|
|
{
|
|
char *pathname = NULL;
|
|
int error, fileid;
|
|
|
|
td->td_retval[0] = -1;
|
|
|
|
pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
|
|
error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL);
|
|
if (error == 0) {
|
|
error = kern_kldload(td, pathname, &fileid);
|
|
if (error == 0)
|
|
td->td_retval[0] = fileid;
|
|
}
|
|
free(pathname, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kern_kldunload(struct thread *td, int fileid, int flags)
|
|
{
|
|
#ifdef HWPMC_HOOKS
|
|
struct pmckern_map_out pkm;
|
|
#endif
|
|
linker_file_t lf;
|
|
int error = 0;
|
|
|
|
if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
|
|
return (error);
|
|
|
|
if ((error = priv_check(td, PRIV_KLD_UNLOAD)) != 0)
|
|
return (error);
|
|
|
|
KLD_LOCK();
|
|
lf = linker_find_file_by_id(fileid);
|
|
if (lf) {
|
|
KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
|
|
if (lf->userrefs == 0) {
|
|
/*
|
|
* XXX: maybe LINKER_UNLOAD_FORCE should override ?
|
|
*/
|
|
printf("kldunload: attempt to unload file that was"
|
|
" loaded by the kernel\n");
|
|
error = EBUSY;
|
|
} else {
|
|
#ifdef HWPMC_HOOKS
|
|
/* Save data needed by hwpmc(4) before unloading. */
|
|
pkm.pm_address = (uintptr_t) lf->address;
|
|
pkm.pm_size = lf->size;
|
|
#endif
|
|
lf->userrefs--;
|
|
error = linker_file_unload(lf, flags);
|
|
if (error)
|
|
lf->userrefs++;
|
|
}
|
|
} else
|
|
error = ENOENT;
|
|
|
|
#ifdef HWPMC_HOOKS
|
|
if (error == 0)
|
|
PMC_CALL_HOOK(td, PMC_FN_KLD_UNLOAD, (void *) &pkm);
|
|
#endif
|
|
KLD_UNLOCK();
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kldunload(struct thread *td, struct kldunload_args *uap)
|
|
{
|
|
|
|
return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL));
|
|
}
|
|
|
|
int
|
|
kldunloadf(struct thread *td, struct kldunloadf_args *uap)
|
|
{
|
|
|
|
if (uap->flags != LINKER_UNLOAD_NORMAL &&
|
|
uap->flags != LINKER_UNLOAD_FORCE)
|
|
return (EINVAL);
|
|
return (kern_kldunload(td, uap->fileid, uap->flags));
|
|
}
|
|
|
|
int
|
|
kldfind(struct thread *td, struct kldfind_args *uap)
|
|
{
|
|
char *pathname;
|
|
const char *filename;
|
|
linker_file_t lf;
|
|
int error;
|
|
|
|
#ifdef MAC
|
|
error = mac_check_kld_stat(td->td_ucred);
|
|
if (error)
|
|
return (error);
|
|
#endif
|
|
|
|
td->td_retval[0] = -1;
|
|
|
|
pathname = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
|
|
if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0)
|
|
goto out;
|
|
|
|
filename = linker_basename(pathname);
|
|
KLD_LOCK();
|
|
lf = linker_find_file_by_name(filename);
|
|
if (lf)
|
|
td->td_retval[0] = lf->id;
|
|
else
|
|
error = ENOENT;
|
|
KLD_UNLOCK();
|
|
out:
|
|
free(pathname, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kldnext(struct thread *td, struct kldnext_args *uap)
|
|
{
|
|
linker_file_t lf;
|
|
int error = 0;
|
|
|
|
#ifdef MAC
|
|
error = mac_check_kld_stat(td->td_ucred);
|
|
if (error)
|
|
return (error);
|
|
#endif
|
|
|
|
KLD_LOCK();
|
|
if (uap->fileid == 0)
|
|
lf = TAILQ_FIRST(&linker_files);
|
|
else {
|
|
lf = linker_find_file_by_id(uap->fileid);
|
|
if (lf == NULL) {
|
|
error = ENOENT;
|
|
goto out;
|
|
}
|
|
lf = TAILQ_NEXT(lf, link);
|
|
}
|
|
|
|
/* Skip partially loaded files. */
|
|
while (lf != NULL && !(lf->flags & LINKER_FILE_LINKED))
|
|
lf = TAILQ_NEXT(lf, link);
|
|
|
|
if (lf)
|
|
td->td_retval[0] = lf->id;
|
|
else
|
|
td->td_retval[0] = 0;
|
|
out:
|
|
KLD_UNLOCK();
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kldstat(struct thread *td, struct kldstat_args *uap)
|
|
{
|
|
struct kld_file_stat stat;
|
|
linker_file_t lf;
|
|
int error, namelen;
|
|
|
|
/*
|
|
* Check the version of the user's structure.
|
|
*/
|
|
error = copyin(uap->stat, &stat, sizeof(struct kld_file_stat));
|
|
if (error)
|
|
return (error);
|
|
if (stat.version != sizeof(struct kld_file_stat))
|
|
return (EINVAL);
|
|
|
|
#ifdef MAC
|
|
error = mac_check_kld_stat(td->td_ucred);
|
|
if (error)
|
|
return (error);
|
|
#endif
|
|
|
|
KLD_LOCK();
|
|
lf = linker_find_file_by_id(uap->fileid);
|
|
if (lf == NULL) {
|
|
KLD_UNLOCK();
|
|
return (ENOENT);
|
|
}
|
|
|
|
namelen = strlen(lf->filename) + 1;
|
|
if (namelen > MAXPATHLEN)
|
|
namelen = MAXPATHLEN;
|
|
bcopy(lf->filename, &stat.name[0], namelen);
|
|
stat.refs = lf->refs;
|
|
stat.id = lf->id;
|
|
stat.address = lf->address;
|
|
stat.size = lf->size;
|
|
KLD_UNLOCK();
|
|
|
|
td->td_retval[0] = 0;
|
|
|
|
return (copyout(&stat, uap->stat, sizeof(struct kld_file_stat)));
|
|
}
|
|
|
|
int
|
|
kldfirstmod(struct thread *td, struct kldfirstmod_args *uap)
|
|
{
|
|
linker_file_t lf;
|
|
module_t mp;
|
|
int error = 0;
|
|
|
|
#ifdef MAC
|
|
error = mac_check_kld_stat(td->td_ucred);
|
|
if (error)
|
|
return (error);
|
|
#endif
|
|
|
|
KLD_LOCK();
|
|
lf = linker_find_file_by_id(uap->fileid);
|
|
if (lf) {
|
|
MOD_SLOCK;
|
|
mp = TAILQ_FIRST(&lf->modules);
|
|
if (mp != NULL)
|
|
td->td_retval[0] = module_getid(mp);
|
|
else
|
|
td->td_retval[0] = 0;
|
|
MOD_SUNLOCK;
|
|
} else
|
|
error = ENOENT;
|
|
KLD_UNLOCK();
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
kldsym(struct thread *td, struct kldsym_args *uap)
|
|
{
|
|
char *symstr = NULL;
|
|
c_linker_sym_t sym;
|
|
linker_symval_t symval;
|
|
linker_file_t lf;
|
|
struct kld_sym_lookup lookup;
|
|
int error = 0;
|
|
|
|
#ifdef MAC
|
|
error = mac_check_kld_stat(td->td_ucred);
|
|
if (error)
|
|
return (error);
|
|
#endif
|
|
|
|
if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0)
|
|
return (error);
|
|
if (lookup.version != sizeof(lookup) ||
|
|
uap->cmd != KLDSYM_LOOKUP)
|
|
return (EINVAL);
|
|
symstr = malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
|
|
if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0)
|
|
goto out;
|
|
KLD_LOCK();
|
|
if (uap->fileid != 0) {
|
|
lf = linker_find_file_by_id(uap->fileid);
|
|
if (lf == NULL)
|
|
error = ENOENT;
|
|
else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
|
|
LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
|
|
lookup.symvalue = (uintptr_t) symval.value;
|
|
lookup.symsize = symval.size;
|
|
error = copyout(&lookup, uap->data, sizeof(lookup));
|
|
} else
|
|
error = ENOENT;
|
|
} else {
|
|
TAILQ_FOREACH(lf, &linker_files, link) {
|
|
if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
|
|
LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
|
|
lookup.symvalue = (uintptr_t)symval.value;
|
|
lookup.symsize = symval.size;
|
|
error = copyout(&lookup, uap->data,
|
|
sizeof(lookup));
|
|
break;
|
|
}
|
|
}
|
|
if (lf == NULL)
|
|
error = ENOENT;
|
|
}
|
|
KLD_UNLOCK();
|
|
out:
|
|
free(symstr, M_TEMP);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Preloaded module support
|
|
*/
|
|
|
|
static modlist_t
|
|
modlist_lookup(const char *name, int ver)
|
|
{
|
|
modlist_t mod;
|
|
|
|
TAILQ_FOREACH(mod, &found_modules, link) {
|
|
if (strcmp(mod->name, name) == 0 &&
|
|
(ver == 0 || mod->version == ver))
|
|
return (mod);
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
static modlist_t
|
|
modlist_lookup2(const char *name, struct mod_depend *verinfo)
|
|
{
|
|
modlist_t mod, bestmod;
|
|
int ver;
|
|
|
|
if (verinfo == NULL)
|
|
return (modlist_lookup(name, 0));
|
|
bestmod = NULL;
|
|
TAILQ_FOREACH(mod, &found_modules, link) {
|
|
if (strcmp(mod->name, name) != 0)
|
|
continue;
|
|
ver = mod->version;
|
|
if (ver == verinfo->md_ver_preferred)
|
|
return (mod);
|
|
if (ver >= verinfo->md_ver_minimum &&
|
|
ver <= verinfo->md_ver_maximum &&
|
|
(bestmod == NULL || ver > bestmod->version))
|
|
bestmod = mod;
|
|
}
|
|
return (bestmod);
|
|
}
|
|
|
|
static modlist_t
|
|
modlist_newmodule(const char *modname, int version, linker_file_t container)
|
|
{
|
|
modlist_t mod;
|
|
|
|
mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT | M_ZERO);
|
|
if (mod == NULL)
|
|
panic("no memory for module list");
|
|
mod->container = container;
|
|
mod->name = modname;
|
|
mod->version = version;
|
|
TAILQ_INSERT_TAIL(&found_modules, mod, link);
|
|
return (mod);
|
|
}
|
|
|
|
static void
|
|
linker_addmodules(linker_file_t lf, struct mod_metadata **start,
|
|
struct mod_metadata **stop, int preload)
|
|
{
|
|
struct mod_metadata *mp, **mdp;
|
|
const char *modname;
|
|
int ver;
|
|
|
|
for (mdp = start; mdp < stop; mdp++) {
|
|
mp = *mdp;
|
|
if (mp->md_type != MDT_VERSION)
|
|
continue;
|
|
modname = mp->md_cval;
|
|
ver = ((struct mod_version *)mp->md_data)->mv_version;
|
|
if (modlist_lookup(modname, ver) != NULL) {
|
|
printf("module %s already present!\n", modname);
|
|
/* XXX what can we do? this is a build error. :-( */
|
|
continue;
|
|
}
|
|
modlist_newmodule(modname, ver, lf);
|
|
}
|
|
}
|
|
|
|
static void
|
|
linker_preload(void *arg)
|
|
{
|
|
caddr_t modptr;
|
|
const char *modname, *nmodname;
|
|
char *modtype;
|
|
linker_file_t lf, nlf;
|
|
linker_class_t lc;
|
|
int error;
|
|
linker_file_list_t loaded_files;
|
|
linker_file_list_t depended_files;
|
|
struct mod_metadata *mp, *nmp;
|
|
struct mod_metadata **start, **stop, **mdp, **nmdp;
|
|
struct mod_depend *verinfo;
|
|
int nver;
|
|
int resolves;
|
|
modlist_t mod;
|
|
struct sysinit **si_start, **si_stop;
|
|
|
|
TAILQ_INIT(&loaded_files);
|
|
TAILQ_INIT(&depended_files);
|
|
TAILQ_INIT(&found_modules);
|
|
error = 0;
|
|
|
|
modptr = NULL;
|
|
while ((modptr = preload_search_next_name(modptr)) != NULL) {
|
|
modname = (char *)preload_search_info(modptr, MODINFO_NAME);
|
|
modtype = (char *)preload_search_info(modptr, MODINFO_TYPE);
|
|
if (modname == NULL) {
|
|
printf("Preloaded module at %p does not have a"
|
|
" name!\n", modptr);
|
|
continue;
|
|
}
|
|
if (modtype == NULL) {
|
|
printf("Preloaded module at %p does not have a type!\n",
|
|
modptr);
|
|
continue;
|
|
}
|
|
if (bootverbose)
|
|
printf("Preloaded %s \"%s\" at %p.\n", modtype, modname,
|
|
modptr);
|
|
lf = NULL;
|
|
TAILQ_FOREACH(lc, &classes, link) {
|
|
error = LINKER_LINK_PRELOAD(lc, modname, &lf);
|
|
if (!error)
|
|
break;
|
|
lf = NULL;
|
|
}
|
|
if (lf)
|
|
TAILQ_INSERT_TAIL(&loaded_files, lf, loaded);
|
|
}
|
|
|
|
/*
|
|
* First get a list of stuff in the kernel.
|
|
*/
|
|
if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME, &start,
|
|
&stop, NULL) == 0)
|
|
linker_addmodules(linker_kernel_file, start, stop, 1);
|
|
|
|
/*
|
|
* This is a once-off kinky bubble sort to resolve relocation
|
|
* dependency requirements.
|
|
*/
|
|
restart:
|
|
TAILQ_FOREACH(lf, &loaded_files, loaded) {
|
|
error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
|
|
&stop, NULL);
|
|
/*
|
|
* First, look to see if we would successfully link with this
|
|
* stuff.
|
|
*/
|
|
resolves = 1; /* unless we know otherwise */
|
|
if (!error) {
|
|
for (mdp = start; mdp < stop; mdp++) {
|
|
mp = *mdp;
|
|
if (mp->md_type != MDT_DEPEND)
|
|
continue;
|
|
modname = mp->md_cval;
|
|
verinfo = mp->md_data;
|
|
for (nmdp = start; nmdp < stop; nmdp++) {
|
|
nmp = *nmdp;
|
|
if (nmp->md_type != MDT_VERSION)
|
|
continue;
|
|
nmodname = nmp->md_cval;
|
|
if (strcmp(modname, nmodname) == 0)
|
|
break;
|
|
}
|
|
if (nmdp < stop) /* it's a self reference */
|
|
continue;
|
|
|
|
/*
|
|
* ok, the module isn't here yet, we
|
|
* are not finished
|
|
*/
|
|
if (modlist_lookup2(modname, verinfo) == NULL)
|
|
resolves = 0;
|
|
}
|
|
}
|
|
/*
|
|
* OK, if we found our modules, we can link. So, "provide"
|
|
* the modules inside and add it to the end of the link order
|
|
* list.
|
|
*/
|
|
if (resolves) {
|
|
if (!error) {
|
|
for (mdp = start; mdp < stop; mdp++) {
|
|
mp = *mdp;
|
|
if (mp->md_type != MDT_VERSION)
|
|
continue;
|
|
modname = mp->md_cval;
|
|
nver = ((struct mod_version *)
|
|
mp->md_data)->mv_version;
|
|
if (modlist_lookup(modname,
|
|
nver) != NULL) {
|
|
printf("module %s already"
|
|
" present!\n", modname);
|
|
TAILQ_REMOVE(&loaded_files,
|
|
lf, loaded);
|
|
linker_file_unload(lf,
|
|
LINKER_UNLOAD_FORCE);
|
|
/* we changed tailq next ptr */
|
|
goto restart;
|
|
}
|
|
modlist_newmodule(modname, nver, lf);
|
|
}
|
|
}
|
|
TAILQ_REMOVE(&loaded_files, lf, loaded);
|
|
TAILQ_INSERT_TAIL(&depended_files, lf, loaded);
|
|
/*
|
|
* Since we provided modules, we need to restart the
|
|
* sort so that the previous files that depend on us
|
|
* have a chance. Also, we've busted the tailq next
|
|
* pointer with the REMOVE.
|
|
*/
|
|
goto restart;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* At this point, we check to see what could not be resolved..
|
|
*/
|
|
while ((lf = TAILQ_FIRST(&loaded_files)) != NULL) {
|
|
TAILQ_REMOVE(&loaded_files, lf, loaded);
|
|
printf("KLD file %s is missing dependencies\n", lf->filename);
|
|
linker_file_unload(lf, LINKER_UNLOAD_FORCE);
|
|
}
|
|
|
|
/*
|
|
* We made it. Finish off the linking in the order we determined.
|
|
*/
|
|
TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf) {
|
|
if (linker_kernel_file) {
|
|
linker_kernel_file->refs++;
|
|
error = linker_file_add_dependency(lf,
|
|
linker_kernel_file);
|
|
if (error)
|
|
panic("cannot add dependency");
|
|
}
|
|
lf->userrefs++; /* so we can (try to) kldunload it */
|
|
error = linker_file_lookup_set(lf, MDT_SETNAME, &start,
|
|
&stop, NULL);
|
|
if (!error) {
|
|
for (mdp = start; mdp < stop; mdp++) {
|
|
mp = *mdp;
|
|
if (mp->md_type != MDT_DEPEND)
|
|
continue;
|
|
modname = mp->md_cval;
|
|
verinfo = mp->md_data;
|
|
mod = modlist_lookup2(modname, verinfo);
|
|
/* Don't count self-dependencies */
|
|
if (lf == mod->container)
|
|
continue;
|
|
mod->container->refs++;
|
|
error = linker_file_add_dependency(lf,
|
|
mod->container);
|
|
if (error)
|
|
panic("cannot add dependency");
|
|
}
|
|
}
|
|
/*
|
|
* Now do relocation etc using the symbol search paths
|
|
* established by the dependencies
|
|
*/
|
|
error = LINKER_LINK_PRELOAD_FINISH(lf);
|
|
if (error) {
|
|
TAILQ_REMOVE(&depended_files, lf, loaded);
|
|
printf("KLD file %s - could not finalize loading\n",
|
|
lf->filename);
|
|
linker_file_unload(lf, LINKER_UNLOAD_FORCE);
|
|
continue;
|
|
}
|
|
linker_file_register_modules(lf);
|
|
if (linker_file_lookup_set(lf, "sysinit_set", &si_start,
|
|
&si_stop, NULL) == 0)
|
|
sysinit_add(si_start, si_stop);
|
|
linker_file_register_sysctls(lf);
|
|
lf->flags |= LINKER_FILE_LINKED;
|
|
}
|
|
/* woohoo! we made it! */
|
|
}
|
|
|
|
SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0)
|
|
|
|
/*
|
|
* Search for a not-loaded module by name.
|
|
*
|
|
* Modules may be found in the following locations:
|
|
*
|
|
* - preloaded (result is just the module name) - on disk (result is full path
|
|
* to module)
|
|
*
|
|
* If the module name is qualified in any way (contains path, etc.) the we
|
|
* simply return a copy of it.
|
|
*
|
|
* The search path can be manipulated via sysctl. Note that we use the ';'
|
|
* character as a separator to be consistent with the bootloader.
|
|
*/
|
|
|
|
static char linker_hintfile[] = "linker.hints";
|
|
static char linker_path[MAXPATHLEN] = "/boot/kernel;/boot/modules";
|
|
|
|
SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RW, linker_path,
|
|
sizeof(linker_path), "module load search path");
|
|
|
|
TUNABLE_STR("module_path", linker_path, sizeof(linker_path));
|
|
|
|
static char *linker_ext_list[] = {
|
|
"",
|
|
".ko",
|
|
NULL
|
|
};
|
|
|
|
/*
|
|
* Check if file actually exists either with or without extension listed in
|
|
* the linker_ext_list. (probably should be generic for the rest of the
|
|
* kernel)
|
|
*/
|
|
static char *
|
|
linker_lookup_file(const char *path, int pathlen, const char *name,
|
|
int namelen, struct vattr *vap)
|
|
{
|
|
struct nameidata nd;
|
|
struct thread *td = curthread; /* XXX */
|
|
char *result, **cpp, *sep;
|
|
int error, len, extlen, reclen, flags, vfslocked;
|
|
enum vtype type;
|
|
|
|
extlen = 0;
|
|
for (cpp = linker_ext_list; *cpp; cpp++) {
|
|
len = strlen(*cpp);
|
|
if (len > extlen)
|
|
extlen = len;
|
|
}
|
|
extlen++; /* trailing '\0' */
|
|
sep = (path[pathlen - 1] != '/') ? "/" : "";
|
|
|
|
reclen = pathlen + strlen(sep) + namelen + extlen + 1;
|
|
result = malloc(reclen, M_LINKER, M_WAITOK);
|
|
for (cpp = linker_ext_list; *cpp; cpp++) {
|
|
snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep,
|
|
namelen, name, *cpp);
|
|
/*
|
|
* Attempt to open the file, and return the path if
|
|
* we succeed and it's a regular file.
|
|
*/
|
|
NDINIT(&nd, LOOKUP, FOLLOW | MPSAFE, UIO_SYSSPACE, result, td);
|
|
flags = FREAD;
|
|
error = vn_open(&nd, &flags, 0, -1);
|
|
if (error == 0) {
|
|
vfslocked = NDHASGIANT(&nd);
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
type = nd.ni_vp->v_type;
|
|
if (vap)
|
|
VOP_GETATTR(nd.ni_vp, vap, td->td_ucred, td);
|
|
VOP_UNLOCK(nd.ni_vp, 0, td);
|
|
vn_close(nd.ni_vp, FREAD, td->td_ucred, td);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
if (type == VREG)
|
|
return (result);
|
|
}
|
|
}
|
|
free(result, M_LINKER);
|
|
return (NULL);
|
|
}
|
|
|
|
#define INT_ALIGN(base, ptr) ptr = \
|
|
(base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1))
|
|
|
|
/*
|
|
* Lookup KLD which contains requested module in the "linker.hints" file. If
|
|
* version specification is available, then try to find the best KLD.
|
|
* Otherwise just find the latest one.
|
|
*/
|
|
static char *
|
|
linker_hints_lookup(const char *path, int pathlen, const char *modname,
|
|
int modnamelen, struct mod_depend *verinfo)
|
|
{
|
|
struct thread *td = curthread; /* XXX */
|
|
struct ucred *cred = td ? td->td_ucred : NULL;
|
|
struct nameidata nd;
|
|
struct vattr vattr, mattr;
|
|
u_char *hints = NULL;
|
|
u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep;
|
|
int error, ival, bestver, *intp, reclen, found, flags, clen, blen;
|
|
int vfslocked = 0;
|
|
|
|
result = NULL;
|
|
bestver = found = 0;
|
|
|
|
sep = (path[pathlen - 1] != '/') ? "/" : "";
|
|
reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen +
|
|
strlen(sep) + 1;
|
|
pathbuf = malloc(reclen, M_LINKER, M_WAITOK);
|
|
snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep,
|
|
linker_hintfile);
|
|
|
|
NDINIT(&nd, LOOKUP, NOFOLLOW | MPSAFE, UIO_SYSSPACE, pathbuf, td);
|
|
flags = FREAD;
|
|
error = vn_open(&nd, &flags, 0, -1);
|
|
if (error)
|
|
goto bad;
|
|
vfslocked = NDHASGIANT(&nd);
|
|
NDFREE(&nd, NDF_ONLY_PNBUF);
|
|
if (nd.ni_vp->v_type != VREG)
|
|
goto bad;
|
|
best = cp = NULL;
|
|
error = VOP_GETATTR(nd.ni_vp, &vattr, cred, td);
|
|
if (error)
|
|
goto bad;
|
|
/*
|
|
* XXX: we need to limit this number to some reasonable value
|
|
*/
|
|
if (vattr.va_size > 100 * 1024) {
|
|
printf("hints file too large %ld\n", (long)vattr.va_size);
|
|
goto bad;
|
|
}
|
|
hints = malloc(vattr.va_size, M_TEMP, M_WAITOK);
|
|
if (hints == NULL)
|
|
goto bad;
|
|
error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0,
|
|
UIO_SYSSPACE, IO_NODELOCKED, cred, NOCRED, &reclen, td);
|
|
if (error)
|
|
goto bad;
|
|
VOP_UNLOCK(nd.ni_vp, 0, td);
|
|
vn_close(nd.ni_vp, FREAD, cred, td);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
nd.ni_vp = NULL;
|
|
if (reclen != 0) {
|
|
printf("can't read %d\n", reclen);
|
|
goto bad;
|
|
}
|
|
intp = (int *)hints;
|
|
ival = *intp++;
|
|
if (ival != LINKER_HINTS_VERSION) {
|
|
printf("hints file version mismatch %d\n", ival);
|
|
goto bad;
|
|
}
|
|
bufend = hints + vattr.va_size;
|
|
recptr = (u_char *)intp;
|
|
clen = blen = 0;
|
|
while (recptr < bufend && !found) {
|
|
intp = (int *)recptr;
|
|
reclen = *intp++;
|
|
ival = *intp++;
|
|
cp = (char *)intp;
|
|
switch (ival) {
|
|
case MDT_VERSION:
|
|
clen = *cp++;
|
|
if (clen != modnamelen || bcmp(cp, modname, clen) != 0)
|
|
break;
|
|
cp += clen;
|
|
INT_ALIGN(hints, cp);
|
|
ival = *(int *)cp;
|
|
cp += sizeof(int);
|
|
clen = *cp++;
|
|
if (verinfo == NULL ||
|
|
ival == verinfo->md_ver_preferred) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
if (ival >= verinfo->md_ver_minimum &&
|
|
ival <= verinfo->md_ver_maximum &&
|
|
ival > bestver) {
|
|
bestver = ival;
|
|
best = cp;
|
|
blen = clen;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
recptr += reclen + sizeof(int);
|
|
}
|
|
/*
|
|
* Finally check if KLD is in the place
|
|
*/
|
|
if (found)
|
|
result = linker_lookup_file(path, pathlen, cp, clen, &mattr);
|
|
else if (best)
|
|
result = linker_lookup_file(path, pathlen, best, blen, &mattr);
|
|
|
|
/*
|
|
* KLD is newer than hints file. What we should do now?
|
|
*/
|
|
if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >))
|
|
printf("warning: KLD '%s' is newer than the linker.hints"
|
|
" file\n", result);
|
|
bad:
|
|
free(pathbuf, M_LINKER);
|
|
if (hints)
|
|
free(hints, M_TEMP);
|
|
if (nd.ni_vp != NULL) {
|
|
VOP_UNLOCK(nd.ni_vp, 0, td);
|
|
vn_close(nd.ni_vp, FREAD, cred, td);
|
|
VFS_UNLOCK_GIANT(vfslocked);
|
|
}
|
|
/*
|
|
* If nothing found or hints is absent - fallback to the old
|
|
* way by using "kldname[.ko]" as module name.
|
|
*/
|
|
if (!found && !bestver && result == NULL)
|
|
result = linker_lookup_file(path, pathlen, modname,
|
|
modnamelen, NULL);
|
|
return (result);
|
|
}
|
|
|
|
/*
|
|
* Lookup KLD which contains requested module in the all directories.
|
|
*/
|
|
static char *
|
|
linker_search_module(const char *modname, int modnamelen,
|
|
struct mod_depend *verinfo)
|
|
{
|
|
char *cp, *ep, *result;
|
|
|
|
/*
|
|
* traverse the linker path
|
|
*/
|
|
for (cp = linker_path; *cp; cp = ep + 1) {
|
|
/* find the end of this component */
|
|
for (ep = cp; (*ep != 0) && (*ep != ';'); ep++);
|
|
result = linker_hints_lookup(cp, ep - cp, modname,
|
|
modnamelen, verinfo);
|
|
if (result != NULL)
|
|
return (result);
|
|
if (*ep == 0)
|
|
break;
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Search for module in all directories listed in the linker_path.
|
|
*/
|
|
static char *
|
|
linker_search_kld(const char *name)
|
|
{
|
|
char *cp, *ep, *result;
|
|
int len;
|
|
|
|
/* qualified at all? */
|
|
if (index(name, '/'))
|
|
return (linker_strdup(name));
|
|
|
|
/* traverse the linker path */
|
|
len = strlen(name);
|
|
for (ep = linker_path; *ep; ep++) {
|
|
cp = ep;
|
|
/* find the end of this component */
|
|
for (; *ep != 0 && *ep != ';'; ep++);
|
|
result = linker_lookup_file(cp, ep - cp, name, len, NULL);
|
|
if (result != NULL)
|
|
return (result);
|
|
}
|
|
return (NULL);
|
|
}
|
|
|
|
static const char *
|
|
linker_basename(const char *path)
|
|
{
|
|
const char *filename;
|
|
|
|
filename = rindex(path, '/');
|
|
if (filename == NULL)
|
|
return path;
|
|
if (filename[1])
|
|
filename++;
|
|
return (filename);
|
|
}
|
|
|
|
#ifdef HWPMC_HOOKS
|
|
|
|
struct hwpmc_context {
|
|
int nobjects;
|
|
int nmappings;
|
|
struct pmckern_map_in *kobase;
|
|
};
|
|
|
|
static int
|
|
linker_hwpmc_list_object(linker_file_t lf, void *arg)
|
|
{
|
|
struct hwpmc_context *hc;
|
|
|
|
hc = arg;
|
|
|
|
/* If we run out of mappings, fail. */
|
|
if (hc->nobjects >= hc->nmappings)
|
|
return (1);
|
|
|
|
/* Save the info for this linker file. */
|
|
hc->kobase[hc->nobjects].pm_file = lf->filename;
|
|
hc->kobase[hc->nobjects].pm_address = (uintptr_t)lf->address;
|
|
hc->nobjects++;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Inform hwpmc about the set of kernel modules currently loaded.
|
|
*/
|
|
void *
|
|
linker_hwpmc_list_objects(void)
|
|
{
|
|
struct hwpmc_context hc;
|
|
|
|
hc.nmappings = 15; /* a reasonable default */
|
|
|
|
retry:
|
|
/* allocate nmappings+1 entries */
|
|
MALLOC(hc.kobase, struct pmckern_map_in *,
|
|
(hc.nmappings + 1) * sizeof(struct pmckern_map_in), M_LINKER,
|
|
M_WAITOK | M_ZERO);
|
|
|
|
hc.nobjects = 0;
|
|
if (linker_file_foreach(linker_hwpmc_list_object, &hc) != 0) {
|
|
hc.nmappings = hc.nobjects;
|
|
FREE(hc.kobase, M_LINKER);
|
|
goto retry;
|
|
}
|
|
|
|
KASSERT(hc.nobjects > 0, ("linker_hpwmc_list_objects: no kernel "
|
|
"objects?"));
|
|
|
|
/* The last entry of the malloced area comprises of all zeros. */
|
|
KASSERT(hc.kobase[hc.nobjects].pm_file == NULL,
|
|
("linker_hwpmc_list_objects: last object not NULL"));
|
|
|
|
return ((void *)hc.kobase);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Find a file which contains given module and load it, if "parent" is not
|
|
* NULL, register a reference to it.
|
|
*/
|
|
static int
|
|
linker_load_module(const char *kldname, const char *modname,
|
|
struct linker_file *parent, struct mod_depend *verinfo,
|
|
struct linker_file **lfpp)
|
|
{
|
|
linker_file_t lfdep;
|
|
const char *filename;
|
|
char *pathname;
|
|
int error;
|
|
|
|
KLD_LOCK_ASSERT();
|
|
if (modname == NULL) {
|
|
/*
|
|
* We have to load KLD
|
|
*/
|
|
KASSERT(verinfo == NULL, ("linker_load_module: verinfo"
|
|
" is not NULL"));
|
|
pathname = linker_search_kld(kldname);
|
|
} else {
|
|
if (modlist_lookup2(modname, verinfo) != NULL)
|
|
return (EEXIST);
|
|
if (kldname != NULL)
|
|
pathname = linker_strdup(kldname);
|
|
else if (rootvnode == NULL)
|
|
pathname = NULL;
|
|
else
|
|
/*
|
|
* Need to find a KLD with required module
|
|
*/
|
|
pathname = linker_search_module(modname,
|
|
strlen(modname), verinfo);
|
|
}
|
|
if (pathname == NULL)
|
|
return (ENOENT);
|
|
|
|
/*
|
|
* Can't load more than one file with the same basename XXX:
|
|
* Actually it should be possible to have multiple KLDs with
|
|
* the same basename but different path because they can
|
|
* provide different versions of the same modules.
|
|
*/
|
|
filename = linker_basename(pathname);
|
|
if (linker_find_file_by_name(filename))
|
|
error = EEXIST;
|
|
else do {
|
|
error = linker_load_file(pathname, &lfdep);
|
|
if (error)
|
|
break;
|
|
if (modname && verinfo &&
|
|
modlist_lookup2(modname, verinfo) == NULL) {
|
|
linker_file_unload(lfdep, LINKER_UNLOAD_FORCE);
|
|
error = ENOENT;
|
|
break;
|
|
}
|
|
if (parent) {
|
|
error = linker_file_add_dependency(parent, lfdep);
|
|
if (error)
|
|
break;
|
|
}
|
|
if (lfpp)
|
|
*lfpp = lfdep;
|
|
} while (0);
|
|
free(pathname, M_LINKER);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* This routine is responsible for finding dependencies of userland initiated
|
|
* kldload(2)'s of files.
|
|
*/
|
|
int
|
|
linker_load_dependencies(linker_file_t lf)
|
|
{
|
|
linker_file_t lfdep;
|
|
struct mod_metadata **start, **stop, **mdp, **nmdp;
|
|
struct mod_metadata *mp, *nmp;
|
|
struct mod_depend *verinfo;
|
|
modlist_t mod;
|
|
const char *modname, *nmodname;
|
|
int ver, error = 0, count;
|
|
|
|
/*
|
|
* All files are dependant on /kernel.
|
|
*/
|
|
KLD_LOCK_ASSERT();
|
|
if (linker_kernel_file) {
|
|
linker_kernel_file->refs++;
|
|
error = linker_file_add_dependency(lf, linker_kernel_file);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
if (linker_file_lookup_set(lf, MDT_SETNAME, &start, &stop,
|
|
&count) != 0)
|
|
return (0);
|
|
for (mdp = start; mdp < stop; mdp++) {
|
|
mp = *mdp;
|
|
if (mp->md_type != MDT_VERSION)
|
|
continue;
|
|
modname = mp->md_cval;
|
|
ver = ((struct mod_version *)mp->md_data)->mv_version;
|
|
mod = modlist_lookup(modname, ver);
|
|
if (mod != NULL) {
|
|
printf("interface %s.%d already present in the KLD"
|
|
" '%s'!\n", modname, ver,
|
|
mod->container->filename);
|
|
return (EEXIST);
|
|
}
|
|
}
|
|
|
|
for (mdp = start; mdp < stop; mdp++) {
|
|
mp = *mdp;
|
|
if (mp->md_type != MDT_DEPEND)
|
|
continue;
|
|
modname = mp->md_cval;
|
|
verinfo = mp->md_data;
|
|
nmodname = NULL;
|
|
for (nmdp = start; nmdp < stop; nmdp++) {
|
|
nmp = *nmdp;
|
|
if (nmp->md_type != MDT_VERSION)
|
|
continue;
|
|
nmodname = nmp->md_cval;
|
|
if (strcmp(modname, nmodname) == 0)
|
|
break;
|
|
}
|
|
if (nmdp < stop)/* early exit, it's a self reference */
|
|
continue;
|
|
mod = modlist_lookup2(modname, verinfo);
|
|
if (mod) { /* woohoo, it's loaded already */
|
|
lfdep = mod->container;
|
|
lfdep->refs++;
|
|
error = linker_file_add_dependency(lf, lfdep);
|
|
if (error)
|
|
break;
|
|
continue;
|
|
}
|
|
error = linker_load_module(NULL, modname, lf, verinfo, NULL);
|
|
if (error) {
|
|
printf("KLD %s: depends on %s - not available\n",
|
|
lf->filename, modname);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (error)
|
|
return (error);
|
|
linker_addmodules(lf, start, stop, 0);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
sysctl_kern_function_list_iterate(const char *name, void *opaque)
|
|
{
|
|
struct sysctl_req *req;
|
|
|
|
req = opaque;
|
|
return (SYSCTL_OUT(req, name, strlen(name) + 1));
|
|
}
|
|
|
|
/*
|
|
* Export a nul-separated, double-nul-terminated list of all function names
|
|
* in the kernel.
|
|
*/
|
|
static int
|
|
sysctl_kern_function_list(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
linker_file_t lf;
|
|
int error;
|
|
|
|
#ifdef MAC
|
|
error = mac_check_kld_stat(req->td->td_ucred);
|
|
if (error)
|
|
return (error);
|
|
#endif
|
|
error = sysctl_wire_old_buffer(req, 0);
|
|
if (error != 0)
|
|
return (error);
|
|
KLD_LOCK();
|
|
TAILQ_FOREACH(lf, &linker_files, link) {
|
|
error = LINKER_EACH_FUNCTION_NAME(lf,
|
|
sysctl_kern_function_list_iterate, req);
|
|
if (error) {
|
|
KLD_UNLOCK();
|
|
return (error);
|
|
}
|
|
}
|
|
KLD_UNLOCK();
|
|
return (SYSCTL_OUT(req, "", 1));
|
|
}
|
|
|
|
SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLFLAG_RD,
|
|
NULL, 0, sysctl_kern_function_list, "", "kernel function list");
|