freebsd-skq/sys/kern/kern_linker.c

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/*-
* Copyright (c) 1997-2000 Doug Rabson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
1999-08-28 01:08:13 +00:00
* $FreeBSD$
*/
#include "opt_ddb.h"
#include "opt_mac.h"
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/sysproto.h>
#include <sys/sysent.h>
#include <sys/proc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/sx.h>
#include <sys/mac.h>
#include <sys/module.h>
#include <sys/linker.h>
#include <sys/fcntl.h>
#include <sys/libkern.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/sysctl.h>
#include "linker_if.h"
#ifdef KLD_DEBUG
int kld_debug = 0;
#endif
/*
* static char *linker_search_path(const char *name, struct mod_depend
* *verinfo);
*/
static const char *linker_basename(const char *path);
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
/* Metadata from the static kernel */
SET_DECLARE(modmetadata_set, struct mod_metadata);
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
MALLOC_DEFINE(M_LINKER, "linker", "kernel linker");
linker_file_t linker_kernel_file;
static struct mtx kld_mtx; /* kernel linker mutex */
static linker_class_list_t classes;
static linker_file_list_t linker_files;
static int next_file_id = 1;
static int linker_no_more_classes = 0;
#define LINKER_GET_NEXT_FILE_ID(a) do { \
linker_file_t lftmp; \
\
retry: \
mtx_lock(&kld_mtx); \
TAILQ_FOREACH(lftmp, &linker_files, link) { \
if (next_file_id == lftmp->id) { \
next_file_id++; \
mtx_unlock(&kld_mtx); \
goto retry; \
} \
} \
(a) = next_file_id; \
mtx_unlock(&kld_mtx); /* Hold for safe read of id variable */ \
} while(0)
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
/* XXX wrong name; we're looking at version provision tags here, not modules */
typedef TAILQ_HEAD(, modlist) modlisthead_t;
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
struct modlist {
TAILQ_ENTRY(modlist) link; /* chain together all modules */
linker_file_t container;
const char *name;
int version;
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
};
typedef struct modlist *modlist_t;
static modlisthead_t found_modules;
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
static modlist_t modlist_lookup2(const char *name,
struct mod_depend *verinfo);
static char *
linker_strdup(const char *str)
{
char *result;
if ((result = malloc((strlen(str) + 1), M_LINKER, 0)) != NULL)
strcpy(result, str);
return (result);
}
static void
linker_init(void *arg)
{
mtx_init(&kld_mtx, "kernel linker", NULL, MTX_DEF);
TAILQ_INIT(&classes);
TAILQ_INIT(&linker_files);
}
SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0)
static void
linker_stop_class_add(void *arg)
{
linker_no_more_classes = 1;
}
SYSINIT(linker_class, SI_SUB_KLD, SI_ORDER_ANY, linker_stop_class_add, NULL)
int
linker_add_class(linker_class_t lc)
{
/*
* We disallow any class registration passt SI_ORDER_ANY
* of SI_SUB_KLD.
*/
if (linker_no_more_classes == 1)
return (EPERM);
kobj_class_compile((kobj_class_t) lc);
TAILQ_INSERT_TAIL(&classes, lc, link);
return (0);
}
static void
linker_file_sysinit(linker_file_t lf)
{
struct sysinit **start, **stop, **sipp, **xipp, *save;
KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n",
lf->filename));
if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL) != 0)
return;
/*
* Perform a bubble sort of the system initialization objects by
* their subsystem (primary key) and order (secondary key).
*
* Since some things care about execution order, this is the operation
* which ensures continued function.
*/
for (sipp = start; sipp < stop; sipp++) {
for (xipp = sipp + 1; xipp < stop; xipp++) {
if ((*sipp)->subsystem < (*xipp)->subsystem ||
((*sipp)->subsystem == (*xipp)->subsystem &&
(*sipp)->order <= (*xipp)->order))
continue; /* skip */
save = *sipp;
*sipp = *xipp;
*xipp = save;
}
}
/*
* Traverse the (now) ordered list of system initialization tasks.
* Perform each task, and continue on to the next task.
*/
for (sipp = start; sipp < stop; sipp++) {
if ((*sipp)->subsystem == SI_SUB_DUMMY)
continue; /* skip dummy task(s) */
/* Call function */
(*((*sipp)->func)) ((*sipp)->udata);
}
}
static void
linker_file_sysuninit(linker_file_t lf)
{
struct sysinit **start, **stop, **sipp, **xipp, *save;
KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n",
lf->filename));
if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop,
NULL) != 0)
return;
/*
* Perform a reverse bubble sort of the system initialization objects
* by their subsystem (primary key) and order (secondary key).
*
* Since some things care about execution order, this is the operation
* which ensures continued function.
*/
for (sipp = start; sipp < stop; sipp++) {
for (xipp = sipp + 1; xipp < stop; xipp++) {
if ((*sipp)->subsystem > (*xipp)->subsystem ||
((*sipp)->subsystem == (*xipp)->subsystem &&
(*sipp)->order >= (*xipp)->order))
continue; /* skip */
save = *sipp;
*sipp = *xipp;
*xipp = save;
}
}
/*
* Traverse the (now) ordered list of system initialization tasks.
* Perform each task, and continue on to the next task.
*/
for (sipp = start; sipp < stop; sipp++) {
if ((*sipp)->subsystem == SI_SUB_DUMMY)
continue; /* skip dummy task(s) */
/* Call function */
(*((*sipp)->func)) ((*sipp)->udata);
}
}
static void
linker_file_register_sysctls(linker_file_t lf)
{
struct sysctl_oid **start, **stop, **oidp;
KLD_DPF(FILE,
("linker_file_register_sysctls: registering SYSCTLs for %s\n",
lf->filename));
if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
return;
for (oidp = start; oidp < stop; oidp++)
sysctl_register_oid(*oidp);
}
static void
linker_file_unregister_sysctls(linker_file_t lf)
{
struct sysctl_oid **start, **stop, **oidp;
KLD_DPF(FILE, ("linker_file_unregister_sysctls: registering SYSCTLs"
" for %s\n", lf->filename));
if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL) != 0)
return;
for (oidp = start; oidp < stop; oidp++)
sysctl_unregister_oid(*oidp);
}
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
static int
linker_file_register_modules(linker_file_t lf)
{
struct mod_metadata **start, **stop, **mdp;
const moduledata_t *moddata;
int error;
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
KLD_DPF(FILE, ("linker_file_register_modules: registering modules"
" in %s\n", lf->filename));
if (linker_file_lookup_set(lf, "modmetadata_set", &start,
&stop, 0) != 0) {
/*
* This fallback should be unnecessary, but if we get booted
* from boot2 instead of loader and we are missing our
* metadata then we have to try the best we can.
*/
if (lf == linker_kernel_file) {
start = SET_BEGIN(modmetadata_set);
stop = SET_LIMIT(modmetadata_set);
} else
return (0);
}
for (mdp = start; mdp < stop; mdp++) {
if ((*mdp)->md_type != MDT_MODULE)
continue;
moddata = (*mdp)->md_data;
KLD_DPF(FILE, ("Registering module %s in %s\n",
moddata->name, lf->filename));
error = module_register(moddata, lf);
if (error)
printf("Module %s failed to register: %d\n",
moddata->name, error);
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
}
return (0);
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
}
static void
linker_init_kernel_modules(void)
{
linker_file_register_modules(linker_kernel_file);
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
}
SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules, 0)
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
static int
linker_load_file(const char *filename, linker_file_t *result)
{
linker_class_t lc;
linker_file_t lf;
int foundfile, error = 0;
/* Refuse to load modules if securelevel raised */
if (securelevel > 0)
return (EPERM);
lf = linker_find_file_by_name(filename);
if (lf) {
KLD_DPF(FILE, ("linker_load_file: file %s is already loaded,"
" incrementing refs\n", filename));
*result = lf;
lf->refs++;
goto out;
}
lf = NULL;
foundfile = 0;
/*
* We do not need to protect (lock) classes here because there is
* no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY)
* and there is no class deregistration mechanism at this time.
*/
TAILQ_FOREACH(lc, &classes, link) {
KLD_DPF(FILE, ("linker_load_file: trying to load %s\n",
filename));
error = LINKER_LOAD_FILE(lc, filename, &lf);
/*
* If we got something other than ENOENT, then it exists but
* we cannot load it for some other reason.
*/
if (error != ENOENT)
foundfile = 1;
if (lf) {
linker_file_register_modules(lf);
linker_file_register_sysctls(lf);
linker_file_sysinit(lf);
lf->flags |= LINKER_FILE_LINKED;
*result = lf;
error = 0;
goto out;
}
}
/*
* Less than ideal, but tells the user whether it failed to load or
* the module was not found.
*/
if (foundfile) {
/*
* Format not recognized or otherwise unloadable.
* When loading a module that is statically built into
* the kernel EEXIST percolates back up as the return
* value. Preserve this so that apps like sysinstall
* can recognize this special case and not post bogus
* dialog boxes.
*/
if (error != EEXIST)
error = ENOEXEC;
} else
error = ENOENT; /* Nothing found */
out:
return (error);
}
int
linker_reference_module(const char *modname, struct mod_depend *verinfo,
linker_file_t *result)
{
modlist_t mod;
if ((mod = modlist_lookup2(modname, verinfo)) != NULL) {
*result = mod->container;
(*result)->refs++;
return (0);
}
return (linker_load_module(NULL, modname, NULL, verinfo, result));
}
linker_file_t
linker_find_file_by_name(const char *filename)
{
linker_file_t lf = 0;
char *koname;
koname = malloc(strlen(filename) + 4, M_LINKER, 0);
if (koname == NULL)
goto out;
sprintf(koname, "%s.ko", filename);
mtx_lock(&kld_mtx);
TAILQ_FOREACH(lf, &linker_files, link) {
if (strcmp(lf->filename, koname) == 0)
break;
if (strcmp(lf->filename, filename) == 0)
break;
}
mtx_unlock(&kld_mtx);
out:
if (koname)
free(koname, M_LINKER);
return (lf);
}
linker_file_t
linker_find_file_by_id(int fileid)
{
linker_file_t lf = 0;
mtx_lock(&kld_mtx);
TAILQ_FOREACH(lf, &linker_files, link)
if (lf->id == fileid)
break;
mtx_unlock(&kld_mtx);
return (lf);
}
linker_file_t
linker_make_file(const char *pathname, linker_class_t lc)
{
linker_file_t lf;
const char *filename;
lf = NULL;
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, 0);
if (lf == NULL)
goto out;
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);
mtx_lock(&kld_mtx);
TAILQ_INSERT_TAIL(&linker_files, lf, link);
mtx_unlock(&kld_mtx);
out:
return (lf);
}
int
linker_file_unload(linker_file_t file)
{
module_t mod, next;
modlist_t ml, nextml;
struct common_symbol *cp;
int error, i;
error = 0;
/* 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_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs));
if (file->refs == 1) {
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)) != 0) {
KLD_DPF(FILE, ("linker_file_unload: module %p"
" vetoes unload\n", mod));
goto out;
} else
MOD_XLOCK;
module_release(mod);
}
MOD_XUNLOCK;
}
file->refs--;
if (file->refs > 0) {
goto out;
}
for (ml = TAILQ_FIRST(&found_modules); ml; ml = nextml) {
nextml = TAILQ_NEXT(ml, link);
if (ml->container == file)
TAILQ_REMOVE(&found_modules, ml, link);
}
/*
* 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);
}
mtx_lock(&kld_mtx);
TAILQ_REMOVE(&linker_files, file, link);
mtx_unlock(&kld_mtx);
if (file->deps) {
for (i = 0; i < file->ndeps; i++)
linker_file_unload(file->deps[i]);
free(file->deps, M_LINKER);
file->deps = NULL;
}
for (cp = STAILQ_FIRST(&file->common); cp;
cp = STAILQ_FIRST(&file->common)) {
STAILQ_REMOVE(&file->common, cp, common_symbol, link);
free(cp, M_LINKER);
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
}
LINKER_UNLOAD(file);
if (file->filename) {
free(file->filename, M_LINKER);
file->filename = NULL;
}
kobj_delete((kobj_t) file, M_LINKER);
out:
return (error);
}
int
linker_file_add_dependency(linker_file_t file, linker_file_t dep)
{
linker_file_t *newdeps;
newdeps = malloc((file->ndeps + 1) * sizeof(linker_file_t *),
M_LINKER, 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 ***
*/
int
linker_file_lookup_set(linker_file_t file, const char *name,
void *firstp, void *lastp, int *countp)
{
return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp));
}
caddr_t
linker_file_lookup_symbol(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_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(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_ZERO);
if (cp == NULL) {
KLD_DPF(SYM, ("linker_file_lookup_symbol: nomem\n"));
return (0);
}
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.
*/
/*
* MPSAFE
*/
int
kldload(struct thread *td, struct kldload_args *uap)
{
char *kldname, *modname;
char *pathname = NULL;
linker_file_t lf;
int error = 0;
td->td_retval[0] = -1;
mtx_lock(&Giant);
if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
goto out;
if ((error = suser(td)) != 0)
goto out;
pathname = malloc(MAXPATHLEN, M_TEMP, 0);
if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0)
goto out;
/*
* If path do not contain qualified name or any dot in it
* (kldname.ko, or kldname.ver.ko) treat it as interface
* name.
*/
if (index(pathname, '/') || index(pathname, '.')) {
kldname = pathname;
modname = NULL;
} else {
kldname = NULL;
modname = pathname;
}
error = linker_load_module(kldname, modname, NULL, NULL, &lf);
if (error)
goto out;
lf->userrefs++;
td->td_retval[0] = lf->id;
out:
if (pathname)
free(pathname, M_TEMP);
mtx_unlock(&Giant);
return (error);
}
/*
* MPSAFE
*/
int
kldunload(struct thread *td, struct kldunload_args *uap)
{
linker_file_t lf;
int error = 0;
mtx_lock(&Giant);
if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
goto out;
if ((error = suser(td)) != 0)
goto out;
2002-12-14 01:56:26 +00:00
lf = linker_find_file_by_id(uap->fileid);
if (lf) {
KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
if (lf->userrefs == 0) {
printf("kldunload: attempt to unload file that was"
" loaded by the kernel\n");
error = EBUSY;
goto out;
}
lf->userrefs--;
error = linker_file_unload(lf);
if (error)
lf->userrefs++;
} else
error = ENOENT;
out:
mtx_unlock(&Giant);
return (error);
}
/*
* MPSAFE
*/
int
kldfind(struct thread *td, struct kldfind_args *uap)
{
char *pathname;
const char *filename;
linker_file_t lf;
int error = 0;
#ifdef MAC
error = mac_check_kld_stat(td->td_ucred);
if (error)
return (error);
#endif
mtx_lock(&Giant);
td->td_retval[0] = -1;
pathname = malloc(MAXPATHLEN, M_TEMP, 0);
if ((error = copyinstr(uap->file, pathname, MAXPATHLEN, NULL)) != 0)
goto out;
filename = linker_basename(pathname);
lf = linker_find_file_by_name(filename);
if (lf)
td->td_retval[0] = lf->id;
else
error = ENOENT;
out:
if (pathname)
free(pathname, M_TEMP);
mtx_unlock(&Giant);
return (error);
}
/*
* MPSAFE
*/
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
mtx_lock(&Giant);
2002-12-14 01:56:26 +00:00
if (uap->fileid == 0) {
mtx_lock(&kld_mtx);
if (TAILQ_FIRST(&linker_files))
td->td_retval[0] = TAILQ_FIRST(&linker_files)->id;
else
td->td_retval[0] = 0;
mtx_unlock(&kld_mtx);
goto out;
}
2002-12-14 01:56:26 +00:00
lf = linker_find_file_by_id(uap->fileid);
if (lf) {
if (TAILQ_NEXT(lf, link))
td->td_retval[0] = TAILQ_NEXT(lf, link)->id;
else
td->td_retval[0] = 0;
} else
error = ENOENT;
out:
mtx_unlock(&Giant);
return (error);
}
/*
* MPSAFE
*/
int
kldstat(struct thread *td, struct kldstat_args *uap)
{
linker_file_t lf;
int error = 0;
int namelen, version;
struct kld_file_stat *stat;
#ifdef MAC
error = mac_check_kld_stat(td->td_ucred);
if (error)
return (error);
#endif
mtx_lock(&Giant);
2002-12-14 01:56:26 +00:00
lf = linker_find_file_by_id(uap->fileid);
if (lf == NULL) {
error = ENOENT;
goto out;
}
2002-12-14 01:56:26 +00:00
stat = uap->stat;
/*
* Check the version of the user's structure.
*/
if ((error = copyin(&stat->version, &version, sizeof(version))) != 0)
goto out;
if (version != sizeof(struct kld_file_stat)) {
error = EINVAL;
goto out;
}
namelen = strlen(lf->filename) + 1;
if (namelen > MAXPATHLEN)
namelen = MAXPATHLEN;
if ((error = copyout(lf->filename, &stat->name[0], namelen)) != 0)
goto out;
if ((error = copyout(&lf->refs, &stat->refs, sizeof(int))) != 0)
goto out;
if ((error = copyout(&lf->id, &stat->id, sizeof(int))) != 0)
goto out;
if ((error = copyout(&lf->address, &stat->address,
sizeof(caddr_t))) != 0)
goto out;
if ((error = copyout(&lf->size, &stat->size, sizeof(size_t))) != 0)
goto out;
td->td_retval[0] = 0;
out:
mtx_unlock(&Giant);
return (error);
}
/*
* MPSAFE
*/
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
mtx_lock(&Giant);
2002-12-14 01:56:26 +00:00
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;
mtx_unlock(&Giant);
return (error);
}
/*
* MPSAFE
*/
1998-11-11 13:04:40 +00:00
int
kldsym(struct thread *td, struct kldsym_args *uap)
1998-11-11 13:04:40 +00:00
{
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
mtx_lock(&Giant);
2002-12-14 01:56:26 +00:00
if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0)
goto out;
if (lookup.version != sizeof(lookup) ||
2002-12-14 01:56:26 +00:00
uap->cmd != KLDSYM_LOOKUP) {
error = EINVAL;
goto out;
1998-11-11 13:04:40 +00:00
}
symstr = malloc(MAXPATHLEN, M_TEMP, 0);
if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN, NULL)) != 0)
goto out;
2002-12-14 01:56:26 +00:00
if (uap->fileid != 0) {
lf = linker_find_file_by_id(uap->fileid);
if (lf == NULL) {
error = ENOENT;
goto out;
}
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 {
mtx_lock(&kld_mtx);
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;
2002-12-14 01:56:26 +00:00
error = copyout(&lookup, uap->data,
sizeof(lookup));
break;
}
}
mtx_unlock(&kld_mtx);
if (lf == NULL)
error = ENOENT;
1998-11-11 13:04:40 +00:00
}
out:
if (symstr)
free(symstr, M_TEMP);
mtx_unlock(&Giant);
return (error);
1998-11-11 13:04:40 +00:00
}
/*
* Preloaded module support
*/
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
static modlist_t
modlist_lookup(const char *name, int ver)
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
{
modlist_t mod;
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
TAILQ_FOREACH(mod, &found_modules, link) {
if (strcmp(mod->name, name) == 0 &&
(ver == 0 || mod->version == ver))
return (mod);
}
return (NULL);
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
}
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;
for (mod = TAILQ_FIRST(&found_modules); mod;
mod = TAILQ_NEXT(mod, 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 &&
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;
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;
}
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) {
lf = NULL;
break;
}
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
}
if (lf)
TAILQ_INSERT_TAIL(&loaded_files, lf, loaded);
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
}
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
/*
* First get a list of stuff in the kernel.
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
*/
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 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);
linker_file_unload(lf);
TAILQ_REMOVE(&loaded_files,
lf, loaded);
/* we changed tailq next ptr */
goto restart;
}
modlist_newmodule(modname, nver, lf);
}
}
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
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;
}
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
}
/*
* At this point, we check to see what could not be resolved..
*/
TAILQ_FOREACH(lf, &loaded_files, loaded) {
printf("KLD file %s is missing dependencies\n", lf->filename);
linker_file_unload(lf);
TAILQ_REMOVE(&loaded_files, lf, loaded);
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
}
/*
* We made it. Finish off the linking in the order we determined.
*/
TAILQ_FOREACH(lf, &depended_files, loaded) {
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);
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) {
printf("KLD file %s - could not finalize loading\n",
lf->filename);
linker_file_unload(lf);
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;/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));
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
static char *linker_ext_list[] = {
"",
".ko",
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
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)
*/
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
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;
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, 0);
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, UIO_SYSSPACE, result, td);
flags = FREAD;
error = vn_open(&nd, &flags, 0);
if (error == 0) {
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);
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;
result = NULL;
bestver = found = 0;
sep = (path[pathlen - 1] != '/') ? "/" : "";
reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen +
strlen(sep) + 1;
pathbuf = malloc(reclen, M_LINKER, 0);
snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep,
linker_hintfile);
NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td);
flags = FREAD;
error = vn_open(&nd, &flags, 0);
if (error)
goto bad;
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, 0);
if (hints == NULL)
goto bad;
error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0,
In order to better support flexible and extensible access control, make a series of modifications to the credential arguments relating to file read and write operations to cliarfy which credential is used for what: - Change fo_read() and fo_write() to accept "active_cred" instead of "cred", and change the semantics of consumers of fo_read() and fo_write() to pass the active credential of the thread requesting an operation rather than the cached file cred. The cached file cred is still available in fo_read() and fo_write() consumers via fp->f_cred. These changes largely in sys_generic.c. For each implementation of fo_read() and fo_write(), update cred usage to reflect this change and maintain current semantics: - badfo_readwrite() unchanged - kqueue_read/write() unchanged pipe_read/write() now authorize MAC using active_cred rather than td->td_ucred - soo_read/write() unchanged - vn_read/write() now authorize MAC using active_cred but VOP_READ/WRITE() with fp->f_cred Modify vn_rdwr() to accept two credential arguments instead of a single credential: active_cred and file_cred. Use active_cred for MAC authorization, and select a credential for use in VOP_READ/WRITE() based on whether file_cred is NULL or not. If file_cred is provided, authorize the VOP using that cred, otherwise the active credential, matching current semantics. Modify current vn_rdwr() consumers to pass a file_cred if used in the context of a struct file, and to always pass active_cred. When vn_rdwr() is used without a file_cred, pass NOCRED. These changes should maintain current semantics for read/write, but avoid a redundant passing of fp->f_cred, as well as making it more clear what the origin of each credential is in file descriptor read/write operations. Follow-up commits will make similar changes to other file descriptor operations, and modify the MAC framework to pass both credentials to MAC policy modules so they can implement either semantic for revocation. Obtained from: TrustedBSD Project Sponsored by: DARPA, NAI Labs
2002-08-15 20:55:08 +00:00
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);
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);
}
/*
* 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, **cpp;
int extlen, len;
/* qualified at all? */
if (index(name, '/'))
return (linker_strdup(name));
extlen = 0;
for (cpp = linker_ext_list; *cpp; cpp++) {
len = strlen(*cpp);
if (len > extlen)
extlen = len;
}
extlen++; /* trailing '\0' */
/* 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);
}
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
static const char *
linker_basename(const char *path)
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
{
const char *filename;
filename = rindex(path, '/');
if (filename == NULL)
return path;
if (filename[1])
filename++;
return (filename);
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
}
/*
* Find a file which contains given module and load it, if "parent" is not
* NULL, register a reference to it.
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
*/
int
linker_load_module(const char *kldname, const char *modname,
struct linker_file *parent, struct mod_depend *verinfo,
struct linker_file **lfpp)
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
{
linker_file_t lfdep;
const char *filename;
char *pathname;
int error;
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);
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
/*
* 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;
goto out;
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
}
do {
error = linker_load_file(pathname, &lfdep);
if (error)
break;
if (modname && verinfo &&
modlist_lookup2(modname, verinfo) == NULL) {
linker_file_unload(lfdep);
error = ENOENT;
break;
}
if (parent) {
error = linker_file_add_dependency(parent, lfdep);
if (error)
break;
}
if (lfpp)
*lfpp = lfdep;
} while (0);
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
out:
if (pathname)
free(pathname, M_LINKER);
return (error);
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
}
/*
* This routine is responsible for finding dependencies of userland initiated
* kldload(2)'s of files.
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
*/
int
linker_load_dependencies(linker_file_t lf)
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
{
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.
*/
if (linker_kernel_file) {
linker_kernel_file->refs++;
error = linker_file_add_dependency(lf, linker_kernel_file);
if (error)
return (error);
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
}
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;
}
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
}
if (error)
return (error);
linker_addmodules(lf, start, stop, 0);
return (error);
First round implementation of a fine grain enhanced module to module version dependency system. This isn't quite finished, but it is at a useful stage to do a functional checkpoint. Highlights: - version and dependency metadata is gathered via linker sets, so things are handled the same for static kernels and code built to live in a kld. - The dependencies are at module level (versus at file level). - Dependencies determine kld symbol search order - this means that you cannot link against symbols in another file unless you depend on it. This is so that you cannot accidently unload the target out from underneath the ones referencing it. - It is flexible enough that we can put tags in #include files and macros so that we can get decent hooks for enforcing recompiles on incompatable ABI changes. eg: if we change struct proc, we could force a recompile for all kld's that reference the proc struct. - Tangled dependency references at boot time are sorted. Files are relocated once all their dependencies are already relocated. Caveats: - Loader support is incomplete, but has been worked on seperately. - Actual enforcement of the version number tags is not active yet - just the module dependencies are live. The actual structure of versioning hasn't been agreed on yet. (eg: major.minor, or whatever) - There is some backwards compatability for old modules without metadata but I'm not sure how good it is. This is based on work originally done by Boris Popov (bp@freebsd.org), but I'm not sure he'd recognize much of it now. Don't blame him. :-) Also, ideas have been borrowed from Mike Smith.
2000-04-29 13:19:31 +00:00
}
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
sysctl_wire_old_buffer(req, 0);
mtx_lock(&kld_mtx);
TAILQ_FOREACH(lf, &linker_files, link) {
error = LINKER_EACH_FUNCTION_NAME(lf,
sysctl_kern_function_list_iterate, req);
if (error) {
mtx_unlock(&kld_mtx);
return (error);
}
}
mtx_unlock(&kld_mtx);
return (SYSCTL_OUT(req, "", 1));
}
SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLFLAG_RD,
NULL, 0, sysctl_kern_function_list, "", "kernel function list");