Bug Summary

File:kern/kern_linker.c
Warning:line 1220, column 10
Copies out a struct with untouched element(s): version

Annotated Source Code

1/*-
2 * Copyright (c) 1997-2000 Doug Rabson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: releng/11.0/sys/kern/kern_linker.c 301751 2016-06-09 18:27:41Z cem $")__asm__(".ident\t\"" "$FreeBSD: releng/11.0/sys/kern/kern_linker.c 301751 2016-06-09 18:27:41Z cem $"
"\"");
29
30#include "opt_ddb.h"
31#include "opt_kld.h"
32#include "opt_hwpmc_hooks.h"
33
34#include <sys/param.h>
35#include <sys/kernel.h>
36#include <sys/systm.h>
37#include <sys/malloc.h>
38#include <sys/sysproto.h>
39#include <sys/sysent.h>
40#include <sys/priv.h>
41#include <sys/proc.h>
42#include <sys/lock.h>
43#include <sys/mutex.h>
44#include <sys/sx.h>
45#include <sys/module.h>
46#include <sys/mount.h>
47#include <sys/linker.h>
48#include <sys/eventhandler.h>
49#include <sys/fcntl.h>
50#include <sys/jail.h>
51#include <sys/libkern.h>
52#include <sys/namei.h>
53#include <sys/vnode.h>
54#include <sys/syscallsubr.h>
55#include <sys/sysctl.h>
56
57#ifdef DDB
58#include <ddb/ddb.h>
59#endif
60
61#include <net/vnet.h>
62
63#include <security/mac/mac_framework.h>
64
65#include "linker_if.h"
66
67#ifdef HWPMC_HOOKS1
68#include <sys/pmckern.h>
69#endif
70
71#ifdef KLD_DEBUG
72int kld_debug = 0;
73SYSCTL_INT(_debug, OID_AUTO, kld_debug, CTLFLAG_RWTUN,static struct sysctl_oid sysctl___debug_kld_debug = { .oid_parent
= ((&(&sysctl___debug)->oid_children)), .oid_children
= { ((void *)0) }, .oid_number = ((-1)), .oid_kind = (2 | 0x00040000
| (((0x80000000|0x40000000)|0x00080000))), .oid_arg1 = (&
kld_debug), .oid_arg2 = (0), .oid_name = ("kld_debug"), .oid_handler
= (sysctl_handle_int), .oid_fmt = ("I"), .oid_descr = "Set various levels of KLD debug"
}; __asm__(".globl " "__start_set_sysctl_set"); __asm__(".globl "
"__stop_set_sysctl_set"); static void const * const __set_sysctl_set_sym_sysctl___debug_kld_debug
__attribute__((__section__("set_" "sysctl_set"))) __attribute__
((__used__)) = &(sysctl___debug_kld_debug); _Static_assert
((((((0x80000000|0x40000000)|0x00080000)) & 0xf) == 0 || (
(((0x80000000|0x40000000)|0x00080000)) & 0) == 2) &&
sizeof(int) == sizeof(*(&kld_debug)), "compile-time assertion failed"
)
74 &kld_debug, 0, "Set various levels of KLD debug")static struct sysctl_oid sysctl___debug_kld_debug = { .oid_parent
= ((&(&sysctl___debug)->oid_children)), .oid_children
= { ((void *)0) }, .oid_number = ((-1)), .oid_kind = (2 | 0x00040000
| (((0x80000000|0x40000000)|0x00080000))), .oid_arg1 = (&
kld_debug), .oid_arg2 = (0), .oid_name = ("kld_debug"), .oid_handler
= (sysctl_handle_int), .oid_fmt = ("I"), .oid_descr = "Set various levels of KLD debug"
}; __asm__(".globl " "__start_set_sysctl_set"); __asm__(".globl "
"__stop_set_sysctl_set"); static void const * const __set_sysctl_set_sym_sysctl___debug_kld_debug
__attribute__((__section__("set_" "sysctl_set"))) __attribute__
((__used__)) = &(sysctl___debug_kld_debug); _Static_assert
((((((0x80000000|0x40000000)|0x00080000)) & 0xf) == 0 || (
(((0x80000000|0x40000000)|0x00080000)) & 0) == 2) &&
sizeof(int) == sizeof(*(&kld_debug)), "compile-time assertion failed"
);
75#endif
76
77/* These variables are used by kernel debuggers to enumerate loaded files. */
78const int kld_off_address = offsetof(struct linker_file, address)__builtin_offsetof(struct linker_file, address);
79const int kld_off_filename = offsetof(struct linker_file, filename)__builtin_offsetof(struct linker_file, filename);
80const int kld_off_pathname = offsetof(struct linker_file, pathname)__builtin_offsetof(struct linker_file, pathname);
81const int kld_off_next = offsetof(struct linker_file, link.tqe_next)__builtin_offsetof(struct linker_file, link.tqe_next);
82
83/*
84 * static char *linker_search_path(const char *name, struct mod_depend
85 * *verinfo);
86 */
87static const char *linker_basename(const char *path);
88
89/*
90 * Find a currently loaded file given its filename.
91 */
92static linker_file_t linker_find_file_by_name(const char* _filename);
93
94/*
95 * Find a currently loaded file given its file id.
96 */
97static linker_file_t linker_find_file_by_id(int _fileid);
98
99/* Metadata from the static kernel */
100SET_DECLARE(modmetadata_set, struct mod_metadata)extern struct mod_metadata __attribute__((__weak__)) *__start_set_modmetadata_set
; extern struct mod_metadata __attribute__((__weak__)) *__stop_set_modmetadata_set;
101
102MALLOC_DEFINE(M_LINKER, "linker", "kernel linker")struct malloc_type M_LINKER[1] = { { ((void *)0), 877983977, "linker"
, ((void *)0) } }; static struct sysinit M_LINKER_init_sys_init
= { SI_SUB_KMEM, SI_ORDER_THIRD, (sysinit_cfunc_t)(sysinit_nfunc_t
)malloc_init, ((void *)(M_LINKER)) }; __asm__(".globl " "__start_set_sysinit_set"
); __asm__(".globl " "__stop_set_sysinit_set"); static void const
* const __set_sysinit_set_sym_M_LINKER_init_sys_init __attribute__
((__section__("set_" "sysinit_set"))) __attribute__((__used__
)) = &(M_LINKER_init_sys_init); static struct sysinit M_LINKER_uninit_sys_uninit
= { SI_SUB_KMEM, SI_ORDER_ANY, (sysinit_cfunc_t)(sysinit_nfunc_t
)malloc_uninit, ((void *)(M_LINKER)) }; __asm__(".globl " "__start_set_sysuninit_set"
); __asm__(".globl " "__stop_set_sysuninit_set"); static void
const * const __set_sysuninit_set_sym_M_LINKER_uninit_sys_uninit
__attribute__((__section__("set_" "sysuninit_set"))) __attribute__
((__used__)) = &(M_LINKER_uninit_sys_uninit);
103
104linker_file_t linker_kernel_file;
105
106static struct sx kld_sx; /* kernel linker lock */
107
108/*
109 * Load counter used by clients to determine if a linker file has been
110 * re-loaded. This counter is incremented for each file load.
111 */
112static int loadcnt;
113
114static linker_class_list_t classes;
115static linker_file_list_t linker_files;
116static int next_file_id = 1;
117static int linker_no_more_classes = 0;
118
119#define LINKER_GET_NEXT_FILE_ID(a)do { linker_file_t lftmp; if (!cold) (void)0; retry: for ((lftmp
) = (((&linker_files))->tqh_first); (lftmp); (lftmp) =
(((lftmp))->link.tqe_next)) { if (next_file_id == lftmp->
id) { next_file_id++; goto retry; } } (a) = next_file_id; } while
(0) do { \
120 linker_file_t lftmp; \
121 \
122 if (!cold) \
123 sx_assert(&kld_sx, SA_XLOCKED)(void)0; \
124retry: \
125 TAILQ_FOREACH(lftmp, &linker_files, link)for ((lftmp) = (((&linker_files))->tqh_first); (lftmp)
; (lftmp) = (((lftmp))->link.tqe_next)) { \
126 if (next_file_id == lftmp->id) { \
127 next_file_id++; \
128 goto retry; \
129 } \
130 } \
131 (a) = next_file_id; \
132} while(0)
133
134
135/* XXX wrong name; we're looking at version provision tags here, not modules */
136typedef TAILQ_HEAD(, modlist)struct { struct modlist *tqh_first; struct modlist **tqh_last
; } modlisthead_t;
137struct modlist {
138 TAILQ_ENTRY(modlist)struct { struct modlist *tqe_next; struct modlist **tqe_prev;
} link; /* chain together all modules */
139 linker_file_t container;
140 const char *name;
141 int version;
142};
143typedef struct modlist *modlist_t;
144static modlisthead_t found_modules;
145
146static int linker_file_add_dependency(linker_file_t file,
147 linker_file_t dep);
148static caddr_t linker_file_lookup_symbol_internal(linker_file_t file,
149 const char* name, int deps);
150static int linker_load_module(const char *kldname,
151 const char *modname, struct linker_file *parent,
152 const struct mod_depend *verinfo, struct linker_file **lfpp);
153static modlist_t modlist_lookup2(const char *name, const struct mod_depend *verinfo);
154
155static void
156linker_init(void *arg)
157{
158
159 sx_init(&kld_sx, "kernel linker")sx_init_flags((&kld_sx), ("kernel linker"), 0);
160 TAILQ_INIT(&classes)do { (((&classes))->tqh_first) = ((void *)0); (&classes
)->tqh_last = &(((&classes))->tqh_first); ; } while
(0);
161 TAILQ_INIT(&linker_files)do { (((&linker_files))->tqh_first) = ((void *)0); (&
linker_files)->tqh_last = &(((&linker_files))->
tqh_first); ; } while (0);
162}
163
164SYSINIT(linker, SI_SUB_KLD, SI_ORDER_FIRST, linker_init, 0)static struct sysinit linker_sys_init = { SI_SUB_KLD, SI_ORDER_FIRST
, (sysinit_cfunc_t)(sysinit_nfunc_t)linker_init, ((void *)(0)
) }; __asm__(".globl " "__start_set_sysinit_set"); __asm__(".globl "
"__stop_set_sysinit_set"); static void const * const __set_sysinit_set_sym_linker_sys_init
__attribute__((__section__("set_" "sysinit_set"))) __attribute__
((__used__)) = &(linker_sys_init);
165
166static void
167linker_stop_class_add(void *arg)
168{
169
170 linker_no_more_classes = 1;
171}
172
173SYSINIT(linker_class, SI_SUB_KLD, SI_ORDER_ANY, linker_stop_class_add, NULL)static struct sysinit linker_class_sys_init = { SI_SUB_KLD, SI_ORDER_ANY
, (sysinit_cfunc_t)(sysinit_nfunc_t)linker_stop_class_add, ((
void *)(((void *)0))) }; __asm__(".globl " "__start_set_sysinit_set"
); __asm__(".globl " "__stop_set_sysinit_set"); static void const
* const __set_sysinit_set_sym_linker_class_sys_init __attribute__
((__section__("set_" "sysinit_set"))) __attribute__((__used__
)) = &(linker_class_sys_init);
174
175int
176linker_add_class(linker_class_t lc)
177{
178
179 /*
180 * We disallow any class registration past SI_ORDER_ANY
181 * of SI_SUB_KLD. We bump the reference count to keep the
182 * ops from being freed.
183 */
184 if (linker_no_more_classes == 1)
185 return (EPERM1);
186 kobj_class_compile((kobj_class_t) lc);
187 ((kobj_class_t)lc)->refs++; /* XXX: kobj_mtx */
188 TAILQ_INSERT_TAIL(&classes, lc, link)do { ; (((lc))->link.tqe_next) = ((void *)0); (lc)->link
.tqe_prev = (&classes)->tqh_last; *(&classes)->
tqh_last = (lc); (&classes)->tqh_last = &(((lc))->
link.tqe_next); ; ; } while (0);
189 return (0);
190}
191
192static void
193linker_file_sysinit(linker_file_t lf)
194{
195 struct sysinit **start, **stop, **sipp, **xipp, *save;
196
197 KLD_DPF(FILE, ("linker_file_sysinit: calling SYSINITs for %s\n",
198 lf->filename));
199
200 sx_assert(&kld_sx, SA_XLOCKED)(void)0;
201
202 if (linker_file_lookup_set(lf, "sysinit_set", &start, &stop, NULL((void *)0)) != 0)
203 return;
204 /*
205 * Perform a bubble sort of the system initialization objects by
206 * their subsystem (primary key) and order (secondary key).
207 *
208 * Since some things care about execution order, this is the operation
209 * which ensures continued function.
210 */
211 for (sipp = start; sipp < stop; sipp++) {
212 for (xipp = sipp + 1; xipp < stop; xipp++) {
213 if ((*sipp)->subsystem < (*xipp)->subsystem ||
214 ((*sipp)->subsystem == (*xipp)->subsystem &&
215 (*sipp)->order <= (*xipp)->order))
216 continue; /* skip */
217 save = *sipp;
218 *sipp = *xipp;
219 *xipp = save;
220 }
221 }
222
223 /*
224 * Traverse the (now) ordered list of system initialization tasks.
225 * Perform each task, and continue on to the next task.
226 */
227 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
228 mtx_lock(&Giant)do { uintptr_t _tid = (uintptr_t)((__curthread())); if ((((((
&Giant))))->mtx_lock != 0x00000004 || !atomic_cmpset_long
(&(((((&Giant)))))->mtx_lock, 0x00000004, (_tid)))
) __mtx_lock_sleep(&(((((&Giant)))))->mtx_lock, _tid
, (((0))), ((((void *)0))), ((0))); else do { (void)0; do { if
(__builtin_expect((sdt_lockstat___adaptive__acquire->id),
0)) (*sdt_probe_func)(sdt_lockstat___adaptive__acquire->id
, (uintptr_t) (((&Giant))), (uintptr_t) 0, (uintptr_t) 0,
(uintptr_t) 0, (uintptr_t) 0); } while (0); } while (0); } while
(0);
229 for (sipp = start; sipp < stop; sipp++) {
230 if ((*sipp)->subsystem == SI_SUB_DUMMY)
231 continue; /* skip dummy task(s) */
232
233 /* Call function */
234 (*((*sipp)->func)) ((*sipp)->udata);
235 }
236 mtx_unlock(&Giant)do { uintptr_t _tid = (uintptr_t)((__curthread())); if (((((&
Giant))))->lock_object.lo_data == 0) do { (void)0; do { if
(__builtin_expect((sdt_lockstat___adaptive__release->id),
0)) (*sdt_probe_func)(sdt_lockstat___adaptive__release->id
, (uintptr_t) (((&Giant))), (uintptr_t) 0, (uintptr_t) 0,
(uintptr_t) 0, (uintptr_t) 0); } while (0); } while (0); if (
((((&Giant))))->mtx_lock != _tid || !atomic_cmpset_long
(&(((((&Giant)))))->mtx_lock, (_tid), 0x00000004))
__mtx_unlock_sleep(&(((((&Giant)))))->mtx_lock, (
((0))), ((((void *)0))), ((0))); } while (0);
237 sx_xlock(&kld_sx)(void)__sx_xlock(((&kld_sx)), (__curthread()), 0, (((void
*)0)), (0));
238}
239
240static void
241linker_file_sysuninit(linker_file_t lf)
242{
243 struct sysinit **start, **stop, **sipp, **xipp, *save;
244
245 KLD_DPF(FILE, ("linker_file_sysuninit: calling SYSUNINITs for %s\n",
246 lf->filename));
247
248 sx_assert(&kld_sx, SA_XLOCKED)(void)0;
249
250 if (linker_file_lookup_set(lf, "sysuninit_set", &start, &stop,
251 NULL((void *)0)) != 0)
252 return;
253
254 /*
255 * Perform a reverse bubble sort of the system initialization objects
256 * by their subsystem (primary key) and order (secondary key).
257 *
258 * Since some things care about execution order, this is the operation
259 * which ensures continued function.
260 */
261 for (sipp = start; sipp < stop; sipp++) {
262 for (xipp = sipp + 1; xipp < stop; xipp++) {
263 if ((*sipp)->subsystem > (*xipp)->subsystem ||
264 ((*sipp)->subsystem == (*xipp)->subsystem &&
265 (*sipp)->order >= (*xipp)->order))
266 continue; /* skip */
267 save = *sipp;
268 *sipp = *xipp;
269 *xipp = save;
270 }
271 }
272
273 /*
274 * Traverse the (now) ordered list of system initialization tasks.
275 * Perform each task, and continue on to the next task.
276 */
277 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
278 mtx_lock(&Giant)do { uintptr_t _tid = (uintptr_t)((__curthread())); if ((((((
&Giant))))->mtx_lock != 0x00000004 || !atomic_cmpset_long
(&(((((&Giant)))))->mtx_lock, 0x00000004, (_tid)))
) __mtx_lock_sleep(&(((((&Giant)))))->mtx_lock, _tid
, (((0))), ((((void *)0))), ((0))); else do { (void)0; do { if
(__builtin_expect((sdt_lockstat___adaptive__acquire->id),
0)) (*sdt_probe_func)(sdt_lockstat___adaptive__acquire->id
, (uintptr_t) (((&Giant))), (uintptr_t) 0, (uintptr_t) 0,
(uintptr_t) 0, (uintptr_t) 0); } while (0); } while (0); } while
(0);
279 for (sipp = start; sipp < stop; sipp++) {
280 if ((*sipp)->subsystem == SI_SUB_DUMMY)
281 continue; /* skip dummy task(s) */
282
283 /* Call function */
284 (*((*sipp)->func)) ((*sipp)->udata);
285 }
286 mtx_unlock(&Giant)do { uintptr_t _tid = (uintptr_t)((__curthread())); if (((((&
Giant))))->lock_object.lo_data == 0) do { (void)0; do { if
(__builtin_expect((sdt_lockstat___adaptive__release->id),
0)) (*sdt_probe_func)(sdt_lockstat___adaptive__release->id
, (uintptr_t) (((&Giant))), (uintptr_t) 0, (uintptr_t) 0,
(uintptr_t) 0, (uintptr_t) 0); } while (0); } while (0); if (
((((&Giant))))->mtx_lock != _tid || !atomic_cmpset_long
(&(((((&Giant)))))->mtx_lock, (_tid), 0x00000004))
__mtx_unlock_sleep(&(((((&Giant)))))->mtx_lock, (
((0))), ((((void *)0))), ((0))); } while (0);
287 sx_xlock(&kld_sx)(void)__sx_xlock(((&kld_sx)), (__curthread()), 0, (((void
*)0)), (0));
288}
289
290static void
291linker_file_register_sysctls(linker_file_t lf)
292{
293 struct sysctl_oid **start, **stop, **oidp;
294
295 KLD_DPF(FILE,
296 ("linker_file_register_sysctls: registering SYSCTLs for %s\n",
297 lf->filename));
298
299 sx_assert(&kld_sx, SA_XLOCKED)(void)0;
300
301 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL((void *)0)) != 0)
302 return;
303
304 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
305 sysctl_wlock();
306 for (oidp = start; oidp < stop; oidp++)
307 sysctl_register_oid(*oidp);
308 sysctl_wunlock();
309 sx_xlock(&kld_sx)(void)__sx_xlock(((&kld_sx)), (__curthread()), 0, (((void
*)0)), (0));
310}
311
312static void
313linker_file_unregister_sysctls(linker_file_t lf)
314{
315 struct sysctl_oid **start, **stop, **oidp;
316
317 KLD_DPF(FILE, ("linker_file_unregister_sysctls: unregistering SYSCTLs"
318 " for %s\n", lf->filename));
319
320 sx_assert(&kld_sx, SA_XLOCKED)(void)0;
321
322 if (linker_file_lookup_set(lf, "sysctl_set", &start, &stop, NULL((void *)0)) != 0)
323 return;
324
325 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
326 sysctl_wlock();
327 for (oidp = start; oidp < stop; oidp++)
328 sysctl_unregister_oid(*oidp);
329 sysctl_wunlock();
330 sx_xlock(&kld_sx)(void)__sx_xlock(((&kld_sx)), (__curthread()), 0, (((void
*)0)), (0));
331}
332
333static int
334linker_file_register_modules(linker_file_t lf)
335{
336 struct mod_metadata **start, **stop, **mdp;
337 const moduledata_t *moddata;
338 int first_error, error;
339
340 KLD_DPF(FILE, ("linker_file_register_modules: registering modules"
341 " in %s\n", lf->filename));
342
343 sx_assert(&kld_sx, SA_XLOCKED)(void)0;
344
345 if (linker_file_lookup_set(lf, "modmetadata_set", &start,
346 &stop, NULL((void *)0)) != 0) {
347 /*
348 * This fallback should be unnecessary, but if we get booted
349 * from boot2 instead of loader and we are missing our
350 * metadata then we have to try the best we can.
351 */
352 if (lf == linker_kernel_file) {
353 start = SET_BEGIN(modmetadata_set)(&__start_set_modmetadata_set);
354 stop = SET_LIMIT(modmetadata_set)(&__stop_set_modmetadata_set);
355 } else
356 return (0);
357 }
358 first_error = 0;
359 for (mdp = start; mdp < stop; mdp++) {
360 if ((*mdp)->md_type != MDT_MODULE2)
361 continue;
362 moddata = (*mdp)->md_data;
363 KLD_DPF(FILE, ("Registering module %s in %s\n",
364 moddata->name, lf->filename));
365 error = module_register(moddata, lf);
366 if (error) {
367 printf("Module %s failed to register: %d\n",
368 moddata->name, error);
369 if (first_error == 0)
370 first_error = error;
371 }
372 }
373 return (first_error);
374}
375
376static void
377linker_init_kernel_modules(void)
378{
379
380 sx_xlock(&kld_sx)(void)__sx_xlock(((&kld_sx)), (__curthread()), 0, (((void
*)0)), (0));
381 linker_file_register_modules(linker_kernel_file);
382 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
383}
384
385SYSINIT(linker_kernel, SI_SUB_KLD, SI_ORDER_ANY, linker_init_kernel_modules,static struct sysinit linker_kernel_sys_init = { SI_SUB_KLD, SI_ORDER_ANY
, (sysinit_cfunc_t)(sysinit_nfunc_t)linker_init_kernel_modules
, ((void *)(0)) }; __asm__(".globl " "__start_set_sysinit_set"
); __asm__(".globl " "__stop_set_sysinit_set"); static void const
* const __set_sysinit_set_sym_linker_kernel_sys_init __attribute__
((__section__("set_" "sysinit_set"))) __attribute__((__used__
)) = &(linker_kernel_sys_init)
386 0)static struct sysinit linker_kernel_sys_init = { SI_SUB_KLD, SI_ORDER_ANY
, (sysinit_cfunc_t)(sysinit_nfunc_t)linker_init_kernel_modules
, ((void *)(0)) }; __asm__(".globl " "__start_set_sysinit_set"
); __asm__(".globl " "__stop_set_sysinit_set"); static void const
* const __set_sysinit_set_sym_linker_kernel_sys_init __attribute__
((__section__("set_" "sysinit_set"))) __attribute__((__used__
)) = &(linker_kernel_sys_init);
387
388static int
389linker_load_file(const char *filename, linker_file_t *result)
390{
391 linker_class_t lc;
392 linker_file_t lf;
393 int foundfile, error, modules;
394
395 /* Refuse to load modules if securelevel raised */
396 if (prison0.pr_securelevel > 0)
397 return (EPERM1);
398
399 sx_assert(&kld_sx, SA_XLOCKED)(void)0;
400 lf = linker_find_file_by_name(filename);
401 if (lf) {
402 KLD_DPF(FILE, ("linker_load_file: file %s is already loaded,"
403 " incrementing refs\n", filename));
404 *result = lf;
405 lf->refs++;
406 return (0);
407 }
408 foundfile = 0;
409 error = 0;
410
411 /*
412 * We do not need to protect (lock) classes here because there is
413 * no class registration past startup (SI_SUB_KLD, SI_ORDER_ANY)
414 * and there is no class deregistration mechanism at this time.
415 */
416 TAILQ_FOREACH(lc, &classes, link)for ((lc) = (((&classes))->tqh_first); (lc); (lc) = ((
(lc))->link.tqe_next)) {
417 KLD_DPF(FILE, ("linker_load_file: trying to load %s\n",
418 filename));
419 error = LINKER_LOAD_FILE(lc, filename, &lf);
420 /*
421 * If we got something other than ENOENT, then it exists but
422 * we cannot load it for some other reason.
423 */
424 if (error != ENOENT2)
425 foundfile = 1;
426 if (lf) {
427 error = linker_file_register_modules(lf);
428 if (error == EEXIST17) {
429 linker_file_unload(lf, LINKER_UNLOAD_FORCE1);
430 return (error);
431 }
432 modules = !TAILQ_EMPTY(&lf->modules)((&lf->modules)->tqh_first == ((void *)0));
433 linker_file_register_sysctls(lf);
434 linker_file_sysinit(lf);
435 lf->flags |= LINKER_FILE_LINKED0x1;
436
437 /*
438 * If all of the modules in this file failed
439 * to load, unload the file and return an
440 * error of ENOEXEC.
441 */
442 if (modules && TAILQ_EMPTY(&lf->modules)((&lf->modules)->tqh_first == ((void *)0))) {
443 linker_file_unload(lf, LINKER_UNLOAD_FORCE1);
444 return (ENOEXEC8);
445 }
446 EVENTHANDLER_INVOKE(kld_load, lf)do { struct eventhandler_list *_el; if ((_el = eventhandler_find_list
("kld_load")) != ((void *)0)) do { struct eventhandler_entry *
_ep; struct eventhandler_entry_kld_load *_t; do { } while (0)
; (void)0; (_el)->el_runcount++; do { } while (0); (void)0
; for ((_ep) = (((&((_el)->el_entries)))->tqh_first
); (_ep); (_ep) = (((_ep))->ee_link.tqe_next)) { if (_ep->
ee_priority != (-1)) { do { uintptr_t _tid = (uintptr_t)((__curthread
())); if (((((&((_el))->el_lock))))->lock_object.lo_data
== 0) do { (void)0; do { if (__builtin_expect((sdt_lockstat___adaptive__release
->id), 0)) (*sdt_probe_func)(sdt_lockstat___adaptive__release
->id, (uintptr_t) (((&((_el))->el_lock))), (uintptr_t
) 0, (uintptr_t) 0, (uintptr_t) 0, (uintptr_t) 0); } while (0
); } while (0); if (((((&((_el))->el_lock))))->mtx_lock
!= _tid || !atomic_cmpset_long(&(((((&((_el))->el_lock
)))))->mtx_lock, (_tid), 0x00000004)) __mtx_unlock_sleep(&
(((((&((_el))->el_lock)))))->mtx_lock, (((0))), (((
(void *)0))), ((0))); } while (0); _t = (struct eventhandler_entry_kld_load
*)_ep; (void)0; _t->eh_func(_ep->ee_arg , lf); do { uintptr_t
_tid = (uintptr_t)((__curthread())); if ((((((&((_el))->
el_lock))))->mtx_lock != 0x00000004 || !atomic_cmpset_long
(&(((((&((_el))->el_lock)))))->mtx_lock, 0x00000004
, (_tid)))) __mtx_lock_sleep(&(((((&((_el))->el_lock
)))))->mtx_lock, _tid, (((0))), ((((void *)0))), ((0))); else
do { (void)0; do { if (__builtin_expect((sdt_lockstat___adaptive__acquire
->id), 0)) (*sdt_probe_func)(sdt_lockstat___adaptive__acquire
->id, (uintptr_t) (((&((_el))->el_lock))), (uintptr_t
) 0, (uintptr_t) 0, (uintptr_t) 0, (uintptr_t) 0); } while (0
); } while (0); } while (0); } } do { } while (0); (_el)->
el_runcount--; if ((_el)->el_runcount == 0) eventhandler_prune_list
(_el); do { uintptr_t _tid = (uintptr_t)((__curthread())); if
(((((&((_el))->el_lock))))->lock_object.lo_data ==
0) do { (void)0; do { if (__builtin_expect((sdt_lockstat___adaptive__release
->id), 0)) (*sdt_probe_func)(sdt_lockstat___adaptive__release
->id, (uintptr_t) (((&((_el))->el_lock))), (uintptr_t
) 0, (uintptr_t) 0, (uintptr_t) 0, (uintptr_t) 0); } while (0
); } while (0); if (((((&((_el))->el_lock))))->mtx_lock
!= _tid || !atomic_cmpset_long(&(((((&((_el))->el_lock
)))))->mtx_lock, (_tid), 0x00000004)) __mtx_unlock_sleep(&
(((((&((_el))->el_lock)))))->mtx_lock, (((0))), (((
(void *)0))), ((0))); } while (0); } while (0); } while (0);
447 *result = lf;
448 return (0);
449 }
450 }
451 /*
452 * Less than ideal, but tells the user whether it failed to load or
453 * the module was not found.
454 */
455 if (foundfile) {
456
457 /*
458 * If the file type has not been recognized by the last try
459 * printout a message before to fail.
460 */
461 if (error == ENOSYS78)
462 printf("linker_load_file: Unsupported file type\n");
463
464 /*
465 * Format not recognized or otherwise unloadable.
466 * When loading a module that is statically built into
467 * the kernel EEXIST percolates back up as the return
468 * value. Preserve this so that apps like sysinstall
469 * can recognize this special case and not post bogus
470 * dialog boxes.
471 */
472 if (error != EEXIST17)
473 error = ENOEXEC8;
474 } else
475 error = ENOENT2; /* Nothing found */
476 return (error);
477}
478
479int
480linker_reference_module(const char *modname, struct mod_depend *verinfo,
481 linker_file_t *result)
482{
483 modlist_t mod;
484 int error;
485
486 sx_xlock(&kld_sx)(void)__sx_xlock(((&kld_sx)), (__curthread()), 0, (((void
*)0)), (0));
487 if ((mod = modlist_lookup2(modname, verinfo)) != NULL((void *)0)) {
488 *result = mod->container;
489 (*result)->refs++;
490 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
491 return (0);
492 }
493
494 error = linker_load_module(NULL((void *)0), modname, NULL((void *)0), verinfo, result);
495 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
496 return (error);
497}
498
499int
500linker_release_module(const char *modname, struct mod_depend *verinfo,
501 linker_file_t lf)
502{
503 modlist_t mod;
504 int error;
505
506 sx_xlock(&kld_sx)(void)__sx_xlock(((&kld_sx)), (__curthread()), 0, (((void
*)0)), (0));
507 if (lf == NULL((void *)0)) {
508 KASSERT(modname != NULL,do { } while (0)
509 ("linker_release_module: no file or name"))do { } while (0);
510 mod = modlist_lookup2(modname, verinfo);
511 if (mod == NULL((void *)0)) {
512 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
513 return (ESRCH3);
514 }
515 lf = mod->container;
516 } else
517 KASSERT(modname == NULL && verinfo == NULL,do { } while (0)
518 ("linker_release_module: both file and name"))do { } while (0);
519 error = linker_file_unload(lf, LINKER_UNLOAD_NORMAL0);
520 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
521 return (error);
522}
523
524static linker_file_t
525linker_find_file_by_name(const char *filename)
526{
527 linker_file_t lf;
528 char *koname;
529
530 koname = malloc(strlen(filename) + 4, M_LINKER, M_WAITOK0x0002);
531 sprintf(koname, "%s.ko", filename);
532
533 sx_assert(&kld_sx, SA_XLOCKED)(void)0;
534 TAILQ_FOREACH(lf, &linker_files, link)for ((lf) = (((&linker_files))->tqh_first); (lf); (lf)
= (((lf))->link.tqe_next)) {
535 if (strcmp(lf->filename, koname) == 0)
536 break;
537 if (strcmp(lf->filename, filename) == 0)
538 break;
539 }
540 free(koname, M_LINKER);
541 return (lf);
542}
543
544static linker_file_t
545linker_find_file_by_id(int fileid)
546{
547 linker_file_t lf;
548
549 sx_assert(&kld_sx, SA_XLOCKED)(void)0;
550 TAILQ_FOREACH(lf, &linker_files, link)for ((lf) = (((&linker_files))->tqh_first); (lf); (lf)
= (((lf))->link.tqe_next))
551 if (lf->id == fileid && lf->flags & LINKER_FILE_LINKED0x1)
552 break;
553 return (lf);
554}
555
556int
557linker_file_foreach(linker_predicate_t *predicate, void *context)
558{
559 linker_file_t lf;
560 int retval = 0;
561
562 sx_xlock(&kld_sx)(void)__sx_xlock(((&kld_sx)), (__curthread()), 0, (((void
*)0)), (0));
563 TAILQ_FOREACH(lf, &linker_files, link)for ((lf) = (((&linker_files))->tqh_first); (lf); (lf)
= (((lf))->link.tqe_next)) {
564 retval = predicate(lf, context);
565 if (retval != 0)
566 break;
567 }
568 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
569 return (retval);
570}
571
572linker_file_t
573linker_make_file(const char *pathname, linker_class_t lc)
574{
575 linker_file_t lf;
576 const char *filename;
577
578 if (!cold)
579 sx_assert(&kld_sx, SA_XLOCKED)(void)0;
580 filename = linker_basename(pathname);
581
582 KLD_DPF(FILE, ("linker_make_file: new file, filename='%s' for pathname='%s'\n", filename, pathname));
583 lf = (linker_file_t)kobj_create((kobj_class_t)lc, M_LINKER, M_WAITOK0x0002);
584 if (lf == NULL((void *)0))
585 return (NULL((void *)0));
586 lf->ctors_addr = 0;
587 lf->ctors_size = 0;
588 lf->refs = 1;
589 lf->userrefs = 0;
590 lf->flags = 0;
591 lf->filename = strdup(filename, M_LINKER);
592 lf->pathname = strdup(pathname, M_LINKER);
593 LINKER_GET_NEXT_FILE_ID(lf->id)do { linker_file_t lftmp; if (!cold) (void)0; retry: for ((lftmp
) = (((&linker_files))->tqh_first); (lftmp); (lftmp) =
(((lftmp))->link.tqe_next)) { if (next_file_id == lftmp->
id) { next_file_id++; goto retry; } } (lf->id) = next_file_id
; } while(0);
594 lf->ndeps = 0;
595 lf->deps = NULL((void *)0);
596 lf->loadcnt = ++loadcnt;
597 STAILQ_INIT(&lf->common)do { (((&lf->common))->stqh_first) = ((void *)0); (
&lf->common)->stqh_last = &(((&lf->common
))->stqh_first); } while (0);
598 TAILQ_INIT(&lf->modules)do { (((&lf->modules))->tqh_first) = ((void *)0); (
&lf->modules)->tqh_last = &(((&lf->modules
))->tqh_first); ; } while (0);
599 TAILQ_INSERT_TAIL(&linker_files, lf, link)do { ; (((lf))->link.tqe_next) = ((void *)0); (lf)->link
.tqe_prev = (&linker_files)->tqh_last; *(&linker_files
)->tqh_last = (lf); (&linker_files)->tqh_last = &
(((lf))->link.tqe_next); ; ; } while (0);
600 return (lf);
601}
602
603int
604linker_file_unload(linker_file_t file, int flags)
605{
606 module_t mod, next;
607 modlist_t ml, nextml;
608 struct common_symbol *cp;
609 int error, i;
610
611 /* Refuse to unload modules if securelevel raised. */
612 if (prison0.pr_securelevel > 0)
613 return (EPERM1);
614
615 sx_assert(&kld_sx, SA_XLOCKED)(void)0;
616 KLD_DPF(FILE, ("linker_file_unload: lf->refs=%d\n", file->refs));
617
618 /* Easy case of just dropping a reference. */
619 if (file->refs > 1) {
620 file->refs--;
621 return (0);
622 }
623
624 /* Give eventhandlers a chance to prevent the unload. */
625 error = 0;
626 EVENTHANDLER_INVOKE(kld_unload_try, file, &error)do { struct eventhandler_list *_el; if ((_el = eventhandler_find_list
("kld_unload_try")) != ((void *)0)) do { struct eventhandler_entry
*_ep; struct eventhandler_entry_kld_unload_try *_t; do { } while
(0); (void)0; (_el)->el_runcount++; do { } while (0); (void
)0; for ((_ep) = (((&((_el)->el_entries)))->tqh_first
); (_ep); (_ep) = (((_ep))->ee_link.tqe_next)) { if (_ep->
ee_priority != (-1)) { do { uintptr_t _tid = (uintptr_t)((__curthread
())); if (((((&((_el))->el_lock))))->lock_object.lo_data
== 0) do { (void)0; do { if (__builtin_expect((sdt_lockstat___adaptive__release
->id), 0)) (*sdt_probe_func)(sdt_lockstat___adaptive__release
->id, (uintptr_t) (((&((_el))->el_lock))), (uintptr_t
) 0, (uintptr_t) 0, (uintptr_t) 0, (uintptr_t) 0); } while (0
); } while (0); if (((((&((_el))->el_lock))))->mtx_lock
!= _tid || !atomic_cmpset_long(&(((((&((_el))->el_lock
)))))->mtx_lock, (_tid), 0x00000004)) __mtx_unlock_sleep(&
(((((&((_el))->el_lock)))))->mtx_lock, (((0))), (((
(void *)0))), ((0))); } while (0); _t = (struct eventhandler_entry_kld_unload_try
*)_ep; (void)0; _t->eh_func(_ep->ee_arg , file, &error
); do { uintptr_t _tid = (uintptr_t)((__curthread())); if (((
(((&((_el))->el_lock))))->mtx_lock != 0x00000004 ||
!atomic_cmpset_long(&(((((&((_el))->el_lock)))))->
mtx_lock, 0x00000004, (_tid)))) __mtx_lock_sleep(&(((((&
((_el))->el_lock)))))->mtx_lock, _tid, (((0))), ((((void
*)0))), ((0))); else do { (void)0; do { if (__builtin_expect
((sdt_lockstat___adaptive__acquire->id), 0)) (*sdt_probe_func
)(sdt_lockstat___adaptive__acquire->id, (uintptr_t) (((&
((_el))->el_lock))), (uintptr_t) 0, (uintptr_t) 0, (uintptr_t
) 0, (uintptr_t) 0); } while (0); } while (0); } while (0); }
} do { } while (0); (_el)->el_runcount--; if ((_el)->el_runcount
== 0) eventhandler_prune_list(_el); do { uintptr_t _tid = (uintptr_t
)((__curthread())); if (((((&((_el))->el_lock))))->
lock_object.lo_data == 0) do { (void)0; do { if (__builtin_expect
((sdt_lockstat___adaptive__release->id), 0)) (*sdt_probe_func
)(sdt_lockstat___adaptive__release->id, (uintptr_t) (((&
((_el))->el_lock))), (uintptr_t) 0, (uintptr_t) 0, (uintptr_t
) 0, (uintptr_t) 0); } while (0); } while (0); if (((((&(
(_el))->el_lock))))->mtx_lock != _tid || !atomic_cmpset_long
(&(((((&((_el))->el_lock)))))->mtx_lock, (_tid)
, 0x00000004)) __mtx_unlock_sleep(&(((((&((_el))->
el_lock)))))->mtx_lock, (((0))), ((((void *)0))), ((0))); }
while (0); } while (0); } while (0);
627 if (error != 0)
628 return (EBUSY16);
629
630 KLD_DPF(FILE, ("linker_file_unload: file is unloading,"
631 " informing modules\n"));
632
633 /*
634 * Quiesce all the modules to give them a chance to veto the unload.
635 */
636 MOD_SLOCK(void)__sx_slock(((&modules_sx)), 0, (((void *)0)), (0));
637 for (mod = TAILQ_FIRST(&file->modules)((&file->modules)->tqh_first); mod;
638 mod = module_getfnext(mod)) {
639
640 error = module_quiesce(mod);
641 if (error != 0 && flags != LINKER_UNLOAD_FORCE1) {
642 KLD_DPF(FILE, ("linker_file_unload: module %s"
643 " vetoed unload\n", module_getname(mod)));
644 /*
645 * XXX: Do we need to tell all the quiesced modules
646 * that they can resume work now via a new module
647 * event?
648 */
649 MOD_SUNLOCK__sx_sunlock(((&modules_sx)), (((void *)0)), (0));
650 return (error);
651 }
652 }
653 MOD_SUNLOCK__sx_sunlock(((&modules_sx)), (((void *)0)), (0));
654
655 /*
656 * Inform any modules associated with this file that they are
657 * being unloaded.
658 */
659 MOD_XLOCK(void)__sx_xlock(((&modules_sx)), (__curthread()), 0, (((
void *)0)), (0));
660 for (mod = TAILQ_FIRST(&file->modules)((&file->modules)->tqh_first); mod; mod = next) {
661 next = module_getfnext(mod);
662 MOD_XUNLOCK__sx_xunlock(((&modules_sx)), (__curthread()), (((void *)
0)), (0));
663
664 /*
665 * Give the module a chance to veto the unload.
666 */
667 if ((error = module_unload(mod)) != 0) {
668#ifdef KLD_DEBUG
669 MOD_SLOCK(void)__sx_slock(((&modules_sx)), 0, (((void *)0)), (0));
670 KLD_DPF(FILE, ("linker_file_unload: module %s"
671 " failed unload\n", module_getname(mod)));
672 MOD_SUNLOCK__sx_sunlock(((&modules_sx)), (((void *)0)), (0));
673#endif
674 return (error);
675 }
676 MOD_XLOCK(void)__sx_xlock(((&modules_sx)), (__curthread()), 0, (((
void *)0)), (0));
677 module_release(mod);
678 }
679 MOD_XUNLOCK__sx_xunlock(((&modules_sx)), (__curthread()), (((void *)
0)), (0));
680
681 TAILQ_FOREACH_SAFE(ml, &found_modules, link, nextml)for ((ml) = (((&found_modules))->tqh_first); (ml) &&
((nextml) = (((ml))->link.tqe_next), 1); (ml) = (nextml)) {
682 if (ml->container == file) {
683 TAILQ_REMOVE(&found_modules, ml, link)do { ; ; ; ; if (((((ml))->link.tqe_next)) != ((void *)0))
(((ml))->link.tqe_next)->link.tqe_prev = (ml)->link
.tqe_prev; else { (&found_modules)->tqh_last = (ml)->
link.tqe_prev; ; } *(ml)->link.tqe_prev = (((ml))->link
.tqe_next); ; ; ; } while (0);
684 free(ml, M_LINKER);
685 }
686 }
687
688 /*
689 * Don't try to run SYSUNINITs if we are unloaded due to a
690 * link error.
691 */
692 if (file->flags & LINKER_FILE_LINKED0x1) {
693 file->flags &= ~LINKER_FILE_LINKED0x1;
694 linker_file_sysuninit(file);
695 linker_file_unregister_sysctls(file);
696 }
697 TAILQ_REMOVE(&linker_files, file, link)do { ; ; ; ; if (((((file))->link.tqe_next)) != ((void *)0
)) (((file))->link.tqe_next)->link.tqe_prev = (file)->
link.tqe_prev; else { (&linker_files)->tqh_last = (file
)->link.tqe_prev; ; } *(file)->link.tqe_prev = (((file)
)->link.tqe_next); ; ; ; } while (0);
698
699 if (file->deps) {
700 for (i = 0; i < file->ndeps; i++)
701 linker_file_unload(file->deps[i], flags);
702 free(file->deps, M_LINKER);
703 file->deps = NULL((void *)0);
704 }
705 while ((cp = STAILQ_FIRST(&file->common)((&file->common)->stqh_first)) != NULL((void *)0)) {
706 STAILQ_REMOVE_HEAD(&file->common, link)do { if (((((&file->common))->stqh_first) = (((((&
file->common))->stqh_first))->link.stqe_next)) == ((
void *)0)) (&file->common)->stqh_last = &(((&
file->common))->stqh_first); } while (0);
707 free(cp, M_LINKER);
708 }
709
710 LINKER_UNLOAD(file);
711
712 EVENTHANDLER_INVOKE(kld_unload, file->filename, file->address,do { struct eventhandler_list *_el; if ((_el = eventhandler_find_list
("kld_unload")) != ((void *)0)) do { struct eventhandler_entry
*_ep; struct eventhandler_entry_kld_unload *_t; do { } while
(0); (void)0; (_el)->el_runcount++; do { } while (0); (void
)0; for ((_ep) = (((&((_el)->el_entries)))->tqh_first
); (_ep); (_ep) = (((_ep))->ee_link.tqe_next)) { if (_ep->
ee_priority != (-1)) { do { uintptr_t _tid = (uintptr_t)((__curthread
())); if (((((&((_el))->el_lock))))->lock_object.lo_data
== 0) do { (void)0; do { if (__builtin_expect((sdt_lockstat___adaptive__release
->id), 0)) (*sdt_probe_func)(sdt_lockstat___adaptive__release
->id, (uintptr_t) (((&((_el))->el_lock))), (uintptr_t
) 0, (uintptr_t) 0, (uintptr_t) 0, (uintptr_t) 0); } while (0
); } while (0); if (((((&((_el))->el_lock))))->mtx_lock
!= _tid || !atomic_cmpset_long(&(((((&((_el))->el_lock
)))))->mtx_lock, (_tid), 0x00000004)) __mtx_unlock_sleep(&
(((((&((_el))->el_lock)))))->mtx_lock, (((0))), (((
(void *)0))), ((0))); } while (0); _t = (struct eventhandler_entry_kld_unload
*)_ep; (void)0; _t->eh_func(_ep->ee_arg , file->filename
, file->address, file->size); do { uintptr_t _tid = (uintptr_t
)((__curthread())); if ((((((&((_el))->el_lock))))->
mtx_lock != 0x00000004 || !atomic_cmpset_long(&(((((&
((_el))->el_lock)))))->mtx_lock, 0x00000004, (_tid)))) __mtx_lock_sleep
(&(((((&((_el))->el_lock)))))->mtx_lock, _tid, (
((0))), ((((void *)0))), ((0))); else do { (void)0; do { if (
__builtin_expect((sdt_lockstat___adaptive__acquire->id), 0
)) (*sdt_probe_func)(sdt_lockstat___adaptive__acquire->id,
(uintptr_t) (((&((_el))->el_lock))), (uintptr_t) 0, (
uintptr_t) 0, (uintptr_t) 0, (uintptr_t) 0); } while (0); } while
(0); } while (0); } } do { } while (0); (_el)->el_runcount
--; if ((_el)->el_runcount == 0) eventhandler_prune_list(_el
); do { uintptr_t _tid = (uintptr_t)((__curthread())); if (((
((&((_el))->el_lock))))->lock_object.lo_data == 0) do
{ (void)0; do { if (__builtin_expect((sdt_lockstat___adaptive__release
->id), 0)) (*sdt_probe_func)(sdt_lockstat___adaptive__release
->id, (uintptr_t) (((&((_el))->el_lock))), (uintptr_t
) 0, (uintptr_t) 0, (uintptr_t) 0, (uintptr_t) 0); } while (0
); } while (0); if (((((&((_el))->el_lock))))->mtx_lock
!= _tid || !atomic_cmpset_long(&(((((&((_el))->el_lock
)))))->mtx_lock, (_tid), 0x00000004)) __mtx_unlock_sleep(&
(((((&((_el))->el_lock)))))->mtx_lock, (((0))), (((
(void *)0))), ((0))); } while (0); } while (0); } while (0)
713 file->size)do { struct eventhandler_list *_el; if ((_el = eventhandler_find_list
("kld_unload")) != ((void *)0)) do { struct eventhandler_entry
*_ep; struct eventhandler_entry_kld_unload *_t; do { } while
(0); (void)0; (_el)->el_runcount++; do { } while (0); (void
)0; for ((_ep) = (((&((_el)->el_entries)))->tqh_first
); (_ep); (_ep) = (((_ep))->ee_link.tqe_next)) { if (_ep->
ee_priority != (-1)) { do { uintptr_t _tid = (uintptr_t)((__curthread
())); if (((((&((_el))->el_lock))))->lock_object.lo_data
== 0) do { (void)0; do { if (__builtin_expect((sdt_lockstat___adaptive__release
->id), 0)) (*sdt_probe_func)(sdt_lockstat___adaptive__release
->id, (uintptr_t) (((&((_el))->el_lock))), (uintptr_t
) 0, (uintptr_t) 0, (uintptr_t) 0, (uintptr_t) 0); } while (0
); } while (0); if (((((&((_el))->el_lock))))->mtx_lock
!= _tid || !atomic_cmpset_long(&(((((&((_el))->el_lock
)))))->mtx_lock, (_tid), 0x00000004)) __mtx_unlock_sleep(&
(((((&((_el))->el_lock)))))->mtx_lock, (((0))), (((
(void *)0))), ((0))); } while (0); _t = (struct eventhandler_entry_kld_unload
*)_ep; (void)0; _t->eh_func(_ep->ee_arg , file->filename
, file->address, file->size); do { uintptr_t _tid = (uintptr_t
)((__curthread())); if ((((((&((_el))->el_lock))))->
mtx_lock != 0x00000004 || !atomic_cmpset_long(&(((((&
((_el))->el_lock)))))->mtx_lock, 0x00000004, (_tid)))) __mtx_lock_sleep
(&(((((&((_el))->el_lock)))))->mtx_lock, _tid, (
((0))), ((((void *)0))), ((0))); else do { (void)0; do { if (
__builtin_expect((sdt_lockstat___adaptive__acquire->id), 0
)) (*sdt_probe_func)(sdt_lockstat___adaptive__acquire->id,
(uintptr_t) (((&((_el))->el_lock))), (uintptr_t) 0, (
uintptr_t) 0, (uintptr_t) 0, (uintptr_t) 0); } while (0); } while
(0); } while (0); } } do { } while (0); (_el)->el_runcount
--; if ((_el)->el_runcount == 0) eventhandler_prune_list(_el
); do { uintptr_t _tid = (uintptr_t)((__curthread())); if (((
((&((_el))->el_lock))))->lock_object.lo_data == 0) do
{ (void)0; do { if (__builtin_expect((sdt_lockstat___adaptive__release
->id), 0)) (*sdt_probe_func)(sdt_lockstat___adaptive__release
->id, (uintptr_t) (((&((_el))->el_lock))), (uintptr_t
) 0, (uintptr_t) 0, (uintptr_t) 0, (uintptr_t) 0); } while (0
); } while (0); if (((((&((_el))->el_lock))))->mtx_lock
!= _tid || !atomic_cmpset_long(&(((((&((_el))->el_lock
)))))->mtx_lock, (_tid), 0x00000004)) __mtx_unlock_sleep(&
(((((&((_el))->el_lock)))))->mtx_lock, (((0))), (((
(void *)0))), ((0))); } while (0); } while (0); } while (0);
714
715 if (file->filename) {
716 free(file->filename, M_LINKER);
717 file->filename = NULL((void *)0);
718 }
719 if (file->pathname) {
720 free(file->pathname, M_LINKER);
721 file->pathname = NULL((void *)0);
722 }
723 kobj_delete((kobj_t) file, M_LINKER);
724 return (0);
725}
726
727int
728linker_ctf_get(linker_file_t file, linker_ctf_t *lc)
729{
730 return (LINKER_CTF_GET(file, lc));
731}
732
733static int
734linker_file_add_dependency(linker_file_t file, linker_file_t dep)
735{
736 linker_file_t *newdeps;
737
738 sx_assert(&kld_sx, SA_XLOCKED)(void)0;
739 file->deps = realloc(file->deps, (file->ndeps + 1) * sizeof(*newdeps),
740 M_LINKER, M_WAITOK0x0002 | M_ZERO0x0100);
741 file->deps[file->ndeps] = dep;
742 file->ndeps++;
743 KLD_DPF(FILE, ("linker_file_add_dependency:"
744 " adding %s as dependency for %s\n",
745 dep->filename, file->filename));
746 return (0);
747}
748
749/*
750 * Locate a linker set and its contents. This is a helper function to avoid
751 * linker_if.h exposure elsewhere. Note: firstp and lastp are really void **.
752 * This function is used in this file so we can avoid having lots of (void **)
753 * casts.
754 */
755int
756linker_file_lookup_set(linker_file_t file, const char *name,
757 void *firstp, void *lastp, int *countp)
758{
759
760 sx_assert(&kld_sx, SA_LOCKED)(void)0;
761 return (LINKER_LOOKUP_SET(file, name, firstp, lastp, countp));
762}
763
764/*
765 * List all functions in a file.
766 */
767int
768linker_file_function_listall(linker_file_t lf,
769 linker_function_nameval_callback_t callback_func, void *arg)
770{
771 return (LINKER_EACH_FUNCTION_NAMEVAL(lf, callback_func, arg));
772}
773
774caddr_t
775linker_file_lookup_symbol(linker_file_t file, const char *name, int deps)
776{
777 caddr_t sym;
778 int locked;
779
780 locked = sx_xlocked(&kld_sx)(((&kld_sx)->sx_lock & ~((0x01 | 0x02 | 0x04 | 0x08
) & ~0x01)) == (uintptr_t)(__curthread()));
781 if (!locked)
782 sx_xlock(&kld_sx)(void)__sx_xlock(((&kld_sx)), (__curthread()), 0, (((void
*)0)), (0));
783 sym = linker_file_lookup_symbol_internal(file, name, deps);
784 if (!locked)
785 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
786 return (sym);
787}
788
789static caddr_t
790linker_file_lookup_symbol_internal(linker_file_t file, const char *name,
791 int deps)
792{
793 c_linker_sym_t sym;
794 linker_symval_t symval;
795 caddr_t address;
796 size_t common_size = 0;
797 int i;
798
799 sx_assert(&kld_sx, SA_XLOCKED)(void)0;
800 KLD_DPF(SYM, ("linker_file_lookup_symbol: file=%p, name=%s, deps=%d\n",
801 file, name, deps));
802
803 if (LINKER_LOOKUP_SYMBOL(file, name, &sym) == 0) {
804 LINKER_SYMBOL_VALUES(file, sym, &symval);
805 if (symval.value == 0)
806 /*
807 * For commons, first look them up in the
808 * dependencies and only allocate space if not found
809 * there.
810 */
811 common_size = symval.size;
812 else {
813 KLD_DPF(SYM, ("linker_file_lookup_symbol: symbol"
814 ".value=%p\n", symval.value));
815 return (symval.value);
816 }
817 }
818 if (deps) {
819 for (i = 0; i < file->ndeps; i++) {
820 address = linker_file_lookup_symbol_internal(
821 file->deps[i], name, 0);
822 if (address) {
823 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
824 " deps value=%p\n", address));
825 return (address);
826 }
827 }
828 }
829 if (common_size > 0) {
830 /*
831 * This is a common symbol which was not found in the
832 * dependencies. We maintain a simple common symbol table in
833 * the file object.
834 */
835 struct common_symbol *cp;
836
837 STAILQ_FOREACH(cp, &file->common, link)for((cp) = (((&file->common))->stqh_first); (cp); (
cp) = (((cp))->link.stqe_next)) {
838 if (strcmp(cp->name, name) == 0) {
839 KLD_DPF(SYM, ("linker_file_lookup_symbol:"
840 " old common value=%p\n", cp->address));
841 return (cp->address);
842 }
843 }
844 /*
845 * Round the symbol size up to align.
846 */
847 common_size = (common_size + sizeof(int) - 1) & -sizeof(int);
848 cp = malloc(sizeof(struct common_symbol)
849 + common_size + strlen(name) + 1, M_LINKER,
850 M_WAITOK0x0002 | M_ZERO0x0100);
851 cp->address = (caddr_t)(cp + 1);
852 cp->name = cp->address + common_size;
853 strcpy(cp->name, name);
854 bzero(cp->address, common_size);
855 STAILQ_INSERT_TAIL(&file->common, cp, link)do { (((cp))->link.stqe_next) = ((void *)0); *(&file->
common)->stqh_last = (cp); (&file->common)->stqh_last
= &(((cp))->link.stqe_next); } while (0);
856
857 KLD_DPF(SYM, ("linker_file_lookup_symbol: new common"
858 " value=%p\n", cp->address));
859 return (cp->address);
860 }
861 KLD_DPF(SYM, ("linker_file_lookup_symbol: fail\n"));
862 return (0);
863}
864
865/*
866 * Both DDB and stack(9) rely on the kernel linker to provide forward and
867 * backward lookup of symbols. However, DDB and sometimes stack(9) need to
868 * do this in a lockfree manner. We provide a set of internal helper
869 * routines to perform these operations without locks, and then wrappers that
870 * optionally lock.
871 *
872 * linker_debug_lookup() is ifdef DDB as currently it's only used by DDB.
873 */
874#ifdef DDB
875static int
876linker_debug_lookup(const char *symstr, c_linker_sym_t *sym)
877{
878 linker_file_t lf;
879
880 TAILQ_FOREACH(lf, &linker_files, link)for ((lf) = (((&linker_files))->tqh_first); (lf); (lf)
= (((lf))->link.tqe_next)) {
881 if (LINKER_LOOKUP_SYMBOL(lf, symstr, sym) == 0)
882 return (0);
883 }
884 return (ENOENT2);
885}
886#endif
887
888static int
889linker_debug_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
890{
891 linker_file_t lf;
892 c_linker_sym_t best, es;
893 u_long diff, bestdiff, off;
894
895 best = 0;
896 off = (uintptr_t)value;
897 bestdiff = off;
898 TAILQ_FOREACH(lf, &linker_files, link)for ((lf) = (((&linker_files))->tqh_first); (lf); (lf)
= (((lf))->link.tqe_next)) {
899 if (LINKER_SEARCH_SYMBOL(lf, value, &es, &diff) != 0)
900 continue;
901 if (es != 0 && diff < bestdiff) {
902 best = es;
903 bestdiff = diff;
904 }
905 if (bestdiff == 0)
906 break;
907 }
908 if (best) {
909 *sym = best;
910 *diffp = bestdiff;
911 return (0);
912 } else {
913 *sym = 0;
914 *diffp = off;
915 return (ENOENT2);
916 }
917}
918
919static int
920linker_debug_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
921{
922 linker_file_t lf;
923
924 TAILQ_FOREACH(lf, &linker_files, link)for ((lf) = (((&linker_files))->tqh_first); (lf); (lf)
= (((lf))->link.tqe_next)) {
925 if (LINKER_SYMBOL_VALUES(lf, sym, symval) == 0)
926 return (0);
927 }
928 return (ENOENT2);
929}
930
931static int
932linker_debug_search_symbol_name(caddr_t value, char *buf, u_int buflen,
933 long *offset)
934{
935 linker_symval_t symval;
936 c_linker_sym_t sym;
937 int error;
938
939 *offset = 0;
940 error = linker_debug_search_symbol(value, &sym, offset);
941 if (error)
942 return (error);
943 error = linker_debug_symbol_values(sym, &symval);
944 if (error)
945 return (error);
946 strlcpy(buf, symval.name, buflen);
947 return (0);
948}
949
950/*
951 * DDB Helpers. DDB has to look across multiple files with their own symbol
952 * tables and string tables.
953 *
954 * Note that we do not obey list locking protocols here. We really don't need
955 * DDB to hang because somebody's got the lock held. We'll take the chance
956 * that the files list is inconsistent instead.
957 */
958#ifdef DDB
959int
960linker_ddb_lookup(const char *symstr, c_linker_sym_t *sym)
961{
962
963 return (linker_debug_lookup(symstr, sym));
964}
965#endif
966
967int
968linker_ddb_search_symbol(caddr_t value, c_linker_sym_t *sym, long *diffp)
969{
970
971 return (linker_debug_search_symbol(value, sym, diffp));
972}
973
974int
975linker_ddb_symbol_values(c_linker_sym_t sym, linker_symval_t *symval)
976{
977
978 return (linker_debug_symbol_values(sym, symval));
979}
980
981int
982linker_ddb_search_symbol_name(caddr_t value, char *buf, u_int buflen,
983 long *offset)
984{
985
986 return (linker_debug_search_symbol_name(value, buf, buflen, offset));
987}
988
989/*
990 * stack(9) helper for non-debugging environemnts. Unlike DDB helpers, we do
991 * obey locking protocols, and offer a significantly less complex interface.
992 */
993int
994linker_search_symbol_name(caddr_t value, char *buf, u_int buflen,
995 long *offset)
996{
997 int error;
998
999 sx_slock(&kld_sx)(void)__sx_slock(((&kld_sx)), 0, (((void *)0)), (0));
1000 error = linker_debug_search_symbol_name(value, buf, buflen, offset);
1001 sx_sunlock(&kld_sx)__sx_sunlock(((&kld_sx)), (((void *)0)), (0));
1002 return (error);
1003}
1004
1005/*
1006 * Syscalls.
1007 */
1008int
1009kern_kldload(struct thread *td, const char *file, int *fileid)
1010{
1011 const char *kldname, *modname;
1012 linker_file_t lf;
1013 int error;
1014
1015 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1016 return (error);
1017
1018 if ((error = priv_check(td, PRIV_KLD_LOAD130)) != 0)
1019 return (error);
1020
1021 /*
1022 * It is possible that kldloaded module will attach a new ifnet,
1023 * so vnet context must be set when this ocurs.
1024 */
1025 CURVNET_SET(TD_TO_VNET(td));
1026
1027 /*
1028 * If file does not contain a qualified name or any dot in it
1029 * (kldname.ko, or kldname.ver.ko) treat it as an interface
1030 * name.
1031 */
1032 if (strchr(file, '/') || strchr(file, '.')) {
1033 kldname = file;
1034 modname = NULL((void *)0);
1035 } else {
1036 kldname = NULL((void *)0);
1037 modname = file;
1038 }
1039
1040 sx_xlock(&kld_sx)(void)__sx_xlock(((&kld_sx)), (__curthread()), 0, (((void
*)0)), (0));
1041 error = linker_load_module(kldname, modname, NULL((void *)0), NULL((void *)0), &lf);
1042 if (error) {
1043 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
1044 goto done;
1045 }
1046 lf->userrefs++;
1047 if (fileid != NULL((void *)0))
1048 *fileid = lf->id;
1049 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
1050
1051done:
1052 CURVNET_RESTORE();
1053 return (error);
1054}
1055
1056int
1057sys_kldload(struct thread *td, struct kldload_args *uap)
1058{
1059 char *pathname = NULL((void *)0);
1060 int error, fileid;
1061
1062 td->td_retvaltd_uretoff.tdu_retval[0] = -1;
1063
1064 pathname = malloc(MAXPATHLEN1024, M_TEMP, M_WAITOK0x0002);
1065 error = copyinstr(uap->file, pathname, MAXPATHLEN1024, NULL((void *)0));
1066 if (error == 0) {
1067 error = kern_kldload(td, pathname, &fileid);
1068 if (error == 0)
1069 td->td_retvaltd_uretoff.tdu_retval[0] = fileid;
1070 }
1071 free(pathname, M_TEMP);
1072 return (error);
1073}
1074
1075int
1076kern_kldunload(struct thread *td, int fileid, int flags)
1077{
1078 linker_file_t lf;
1079 int error = 0;
1080
1081 if ((error = securelevel_gt(td->td_ucred, 0)) != 0)
1082 return (error);
1083
1084 if ((error = priv_check(td, PRIV_KLD_UNLOAD131)) != 0)
1085 return (error);
1086
1087 CURVNET_SET(TD_TO_VNET(td));
1088 sx_xlock(&kld_sx)(void)__sx_xlock(((&kld_sx)), (__curthread()), 0, (((void
*)0)), (0));
1089 lf = linker_find_file_by_id(fileid);
1090 if (lf) {
1091 KLD_DPF(FILE, ("kldunload: lf->userrefs=%d\n", lf->userrefs));
1092
1093 if (lf->userrefs == 0) {
1094 /*
1095 * XXX: maybe LINKER_UNLOAD_FORCE should override ?
1096 */
1097 printf("kldunload: attempt to unload file that was"
1098 " loaded by the kernel\n");
1099 error = EBUSY16;
1100 } else {
1101 lf->userrefs--;
1102 error = linker_file_unload(lf, flags);
1103 if (error)
1104 lf->userrefs++;
1105 }
1106 } else
1107 error = ENOENT2;
1108 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
1109
1110 CURVNET_RESTORE();
1111 return (error);
1112}
1113
1114int
1115sys_kldunload(struct thread *td, struct kldunload_args *uap)
1116{
1117
1118 return (kern_kldunload(td, uap->fileid, LINKER_UNLOAD_NORMAL0));
1119}
1120
1121int
1122sys_kldunloadf(struct thread *td, struct kldunloadf_args *uap)
1123{
1124
1125 if (uap->flags != LINKER_UNLOAD_NORMAL0 &&
1126 uap->flags != LINKER_UNLOAD_FORCE1)
1127 return (EINVAL22);
1128 return (kern_kldunload(td, uap->fileid, uap->flags));
1129}
1130
1131int
1132sys_kldfind(struct thread *td, struct kldfind_args *uap)
1133{
1134 char *pathname;
1135 const char *filename;
1136 linker_file_t lf;
1137 int error;
1138
1139#ifdef MAC1
1140 error = mac_kld_check_stat(td->td_ucred);
1141 if (error)
1142 return (error);
1143#endif
1144
1145 td->td_retvaltd_uretoff.tdu_retval[0] = -1;
1146
1147 pathname = malloc(MAXPATHLEN1024, M_TEMP, M_WAITOK0x0002);
1148 if ((error = copyinstr(uap->file, pathname, MAXPATHLEN1024, NULL((void *)0))) != 0)
1149 goto out;
1150
1151 filename = linker_basename(pathname);
1152 sx_xlock(&kld_sx)(void)__sx_xlock(((&kld_sx)), (__curthread()), 0, (((void
*)0)), (0));
1153 lf = linker_find_file_by_name(filename);
1154 if (lf)
1155 td->td_retvaltd_uretoff.tdu_retval[0] = lf->id;
1156 else
1157 error = ENOENT2;
1158 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
1159out:
1160 free(pathname, M_TEMP);
1161 return (error);
1162}
1163
1164int
1165sys_kldnext(struct thread *td, struct kldnext_args *uap)
1166{
1167 linker_file_t lf;
1168 int error = 0;
1169
1170#ifdef MAC1
1171 error = mac_kld_check_stat(td->td_ucred);
1172 if (error)
1173 return (error);
1174#endif
1175
1176 sx_xlock(&kld_sx)(void)__sx_xlock(((&kld_sx)), (__curthread()), 0, (((void
*)0)), (0));
1177 if (uap->fileid == 0)
1178 lf = TAILQ_FIRST(&linker_files)((&linker_files)->tqh_first);
1179 else {
1180 lf = linker_find_file_by_id(uap->fileid);
1181 if (lf == NULL((void *)0)) {
1182 error = ENOENT2;
1183 goto out;
1184 }
1185 lf = TAILQ_NEXT(lf, link)((lf)->link.tqe_next);
1186 }
1187
1188 /* Skip partially loaded files. */
1189 while (lf != NULL((void *)0) && !(lf->flags & LINKER_FILE_LINKED0x1))
1190 lf = TAILQ_NEXT(lf, link)((lf)->link.tqe_next);
1191
1192 if (lf)
1193 td->td_retvaltd_uretoff.tdu_retval[0] = lf->id;
1194 else
1195 td->td_retvaltd_uretoff.tdu_retval[0] = 0;
1196out:
1197 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
1198 return (error);
1199}
1200
1201int
1202sys_kldstat(struct thread *td, struct kldstat_args *uap)
1203{
1204 struct kld_file_stat stat;
1205 int error, version;
1206
1207 /*
1208 * Check the version of the user's structure.
1209 */
1210 if ((error = copyin(&uap->stat->version, &version, sizeof(version)))
1
Taking false branch
→
1211 != 0)
1212 return (error);
1213 if (version != sizeof(struct kld_file_stat_1) &&
2
←
Taking false branch
→
1214 version != sizeof(struct kld_file_stat))
1215 return (EINVAL22);
1216
1217 error = kern_kldstat(td, uap->fileid, &stat);
1218 if (error != 0)
3
←
Taking false branch
→
1219 return (error);
1220 return (copyout(&stat, uap->stat, version));
4
←
Copies out a struct with untouched element(s): version
1221}
1222
1223int
1224kern_kldstat(struct thread *td, int fileid, struct kld_file_stat *stat)
1225{
1226 linker_file_t lf;
1227 int namelen;
1228#ifdef MAC1
1229 int error;
1230
1231 error = mac_kld_check_stat(td->td_ucred);
1232 if (error)
1233 return (error);
1234#endif
1235
1236 sx_xlock(&kld_sx)(void)__sx_xlock(((&kld_sx)), (__curthread()), 0, (((void
*)0)), (0));
1237 lf = linker_find_file_by_id(fileid);
1238 if (lf == NULL((void *)0)) {
1239 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
1240 return (ENOENT2);
1241 }
1242
1243 /* Version 1 fields: */
1244 namelen = strlen(lf->filename) + 1;
1245 if (namelen > MAXPATHLEN1024)
1246 namelen = MAXPATHLEN1024;
1247 bcopy(lf->filename, &stat->name[0], namelen);
1248 stat->refs = lf->refs;
1249 stat->id = lf->id;
1250 stat->address = lf->address;
1251 stat->size = lf->size;
1252 /* Version 2 fields: */
1253 namelen = strlen(lf->pathname) + 1;
1254 if (namelen > MAXPATHLEN1024)
1255 namelen = MAXPATHLEN1024;
1256 bcopy(lf->pathname, &stat->pathname[0], namelen);
1257 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
1258
1259 td->td_retvaltd_uretoff.tdu_retval[0] = 0;
1260 return (0);
1261}
1262
1263#ifdef DDB
1264DB_COMMAND(kldstat, db_kldstat)
1265{
1266 linker_file_t lf;
1267
1268#define POINTER_WIDTH ((int)(sizeof(void *) * 2 + 2))
1269 db_printf("Id Refs Address%*c Size Name\n", POINTER_WIDTH - 7, ' ');
1270#undef POINTER_WIDTH
1271 TAILQ_FOREACH(lf, &linker_files, link)for ((lf) = (((&linker_files))->tqh_first); (lf); (lf)
= (((lf))->link.tqe_next)) {
1272 if (db_pager_quit)
1273 return;
1274 db_printf("%2d %4d %p %-8zx %s\n", lf->id, lf->refs,
1275 lf->address, lf->size, lf->filename);
1276 }
1277}
1278#endif /* DDB */
1279
1280int
1281sys_kldfirstmod(struct thread *td, struct kldfirstmod_args *uap)
1282{
1283 linker_file_t lf;
1284 module_t mp;
1285 int error = 0;
1286
1287#ifdef MAC1
1288 error = mac_kld_check_stat(td->td_ucred);
1289 if (error)
1290 return (error);
1291#endif
1292
1293 sx_xlock(&kld_sx)(void)__sx_xlock(((&kld_sx)), (__curthread()), 0, (((void
*)0)), (0));
1294 lf = linker_find_file_by_id(uap->fileid);
1295 if (lf) {
1296 MOD_SLOCK(void)__sx_slock(((&modules_sx)), 0, (((void *)0)), (0));
1297 mp = TAILQ_FIRST(&lf->modules)((&lf->modules)->tqh_first);
1298 if (mp != NULL((void *)0))
1299 td->td_retvaltd_uretoff.tdu_retval[0] = module_getid(mp);
1300 else
1301 td->td_retvaltd_uretoff.tdu_retval[0] = 0;
1302 MOD_SUNLOCK__sx_sunlock(((&modules_sx)), (((void *)0)), (0));
1303 } else
1304 error = ENOENT2;
1305 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
1306 return (error);
1307}
1308
1309int
1310sys_kldsym(struct thread *td, struct kldsym_args *uap)
1311{
1312 char *symstr = NULL((void *)0);
1313 c_linker_sym_t sym;
1314 linker_symval_t symval;
1315 linker_file_t lf;
1316 struct kld_sym_lookup lookup;
1317 int error = 0;
1318
1319#ifdef MAC1
1320 error = mac_kld_check_stat(td->td_ucred);
1321 if (error)
1322 return (error);
1323#endif
1324
1325 if ((error = copyin(uap->data, &lookup, sizeof(lookup))) != 0)
1326 return (error);
1327 if (lookup.version != sizeof(lookup) ||
1328 uap->cmd != KLDSYM_LOOKUP1)
1329 return (EINVAL22);
1330 symstr = malloc(MAXPATHLEN1024, M_TEMP, M_WAITOK0x0002);
1331 if ((error = copyinstr(lookup.symname, symstr, MAXPATHLEN1024, NULL((void *)0))) != 0)
1332 goto out;
1333 sx_xlock(&kld_sx)(void)__sx_xlock(((&kld_sx)), (__curthread()), 0, (((void
*)0)), (0));
1334 if (uap->fileid != 0) {
1335 lf = linker_find_file_by_id(uap->fileid);
1336 if (lf == NULL((void *)0))
1337 error = ENOENT2;
1338 else if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1339 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1340 lookup.symvalue = (uintptr_t) symval.value;
1341 lookup.symsize = symval.size;
1342 error = copyout(&lookup, uap->data, sizeof(lookup));
1343 } else
1344 error = ENOENT2;
1345 } else {
1346 TAILQ_FOREACH(lf, &linker_files, link)for ((lf) = (((&linker_files))->tqh_first); (lf); (lf)
= (((lf))->link.tqe_next)) {
1347 if (LINKER_LOOKUP_SYMBOL(lf, symstr, &sym) == 0 &&
1348 LINKER_SYMBOL_VALUES(lf, sym, &symval) == 0) {
1349 lookup.symvalue = (uintptr_t)symval.value;
1350 lookup.symsize = symval.size;
1351 error = copyout(&lookup, uap->data,
1352 sizeof(lookup));
1353 break;
1354 }
1355 }
1356 if (lf == NULL((void *)0))
1357 error = ENOENT2;
1358 }
1359 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
1360out:
1361 free(symstr, M_TEMP);
1362 return (error);
1363}
1364
1365/*
1366 * Preloaded module support
1367 */
1368
1369static modlist_t
1370modlist_lookup(const char *name, int ver)
1371{
1372 modlist_t mod;
1373
1374 TAILQ_FOREACH(mod, &found_modules, link)for ((mod) = (((&found_modules))->tqh_first); (mod); (
mod) = (((mod))->link.tqe_next)) {
1375 if (strcmp(mod->name, name) == 0 &&
1376 (ver == 0 || mod->version == ver))
1377 return (mod);
1378 }
1379 return (NULL((void *)0));
1380}
1381
1382static modlist_t
1383modlist_lookup2(const char *name, const struct mod_depend *verinfo)
1384{
1385 modlist_t mod, bestmod;
1386 int ver;
1387
1388 if (verinfo == NULL((void *)0))
1389 return (modlist_lookup(name, 0));
1390 bestmod = NULL((void *)0);
1391 TAILQ_FOREACH(mod, &found_modules, link)for ((mod) = (((&found_modules))->tqh_first); (mod); (
mod) = (((mod))->link.tqe_next)) {
1392 if (strcmp(mod->name, name) != 0)
1393 continue;
1394 ver = mod->version;
1395 if (ver == verinfo->md_ver_preferred)
1396 return (mod);
1397 if (ver >= verinfo->md_ver_minimum &&
1398 ver <= verinfo->md_ver_maximum &&
1399 (bestmod == NULL((void *)0) || ver > bestmod->version))
1400 bestmod = mod;
1401 }
1402 return (bestmod);
1403}
1404
1405static modlist_t
1406modlist_newmodule(const char *modname, int version, linker_file_t container)
1407{
1408 modlist_t mod;
1409
1410 mod = malloc(sizeof(struct modlist), M_LINKER, M_NOWAIT0x0001 | M_ZERO0x0100);
1411 if (mod == NULL((void *)0))
1412 panic("no memory for module list");
1413 mod->container = container;
1414 mod->name = modname;
1415 mod->version = version;
1416 TAILQ_INSERT_TAIL(&found_modules, mod, link)do { ; (((mod))->link.tqe_next) = ((void *)0); (mod)->link
.tqe_prev = (&found_modules)->tqh_last; *(&found_modules
)->tqh_last = (mod); (&found_modules)->tqh_last = &
(((mod))->link.tqe_next); ; ; } while (0);
1417 return (mod);
1418}
1419
1420static void
1421linker_addmodules(linker_file_t lf, struct mod_metadata **start,
1422 struct mod_metadata **stop, int preload)
1423{
1424 struct mod_metadata *mp, **mdp;
1425 const char *modname;
1426 int ver;
1427
1428 for (mdp = start; mdp < stop; mdp++) {
1429 mp = *mdp;
1430 if (mp->md_type != MDT_VERSION3)
1431 continue;
1432 modname = mp->md_cval;
1433 ver = ((const struct mod_version *)mp->md_data)->mv_version;
1434 if (modlist_lookup(modname, ver) != NULL((void *)0)) {
1435 printf("module %s already present!\n", modname);
1436 /* XXX what can we do? this is a build error. :-( */
1437 continue;
1438 }
1439 modlist_newmodule(modname, ver, lf);
1440 }
1441}
1442
1443static void
1444linker_preload(void *arg)
1445{
1446 caddr_t modptr;
1447 const char *modname, *nmodname;
1448 char *modtype;
1449 linker_file_t lf, nlf;
1450 linker_class_t lc;
1451 int error;
1452 linker_file_list_t loaded_files;
1453 linker_file_list_t depended_files;
1454 struct mod_metadata *mp, *nmp;
1455 struct mod_metadata **start, **stop, **mdp, **nmdp;
1456 const struct mod_depend *verinfo;
1457 int nver;
1458 int resolves;
1459 modlist_t mod;
1460 struct sysinit **si_start, **si_stop;
1461
1462 TAILQ_INIT(&loaded_files)do { (((&loaded_files))->tqh_first) = ((void *)0); (&
loaded_files)->tqh_last = &(((&loaded_files))->
tqh_first); ; } while (0);
1463 TAILQ_INIT(&depended_files)do { (((&depended_files))->tqh_first) = ((void *)0); (
&depended_files)->tqh_last = &(((&depended_files
))->tqh_first); ; } while (0);
1464 TAILQ_INIT(&found_modules)do { (((&found_modules))->tqh_first) = ((void *)0); (&
found_modules)->tqh_last = &(((&found_modules))->
tqh_first); ; } while (0);
1465 error = 0;
1466
1467 modptr = NULL((void *)0);
1468 sx_xlock(&kld_sx)(void)__sx_xlock(((&kld_sx)), (__curthread()), 0, (((void
*)0)), (0));
1469 while ((modptr = preload_search_next_name(modptr)) != NULL((void *)0)) {
1470 modname = (char *)preload_search_info(modptr, MODINFO_NAME0x0001);
1471 modtype = (char *)preload_search_info(modptr, MODINFO_TYPE0x0002);
1472 if (modname == NULL((void *)0)) {
1473 printf("Preloaded module at %p does not have a"
1474 " name!\n", modptr);
1475 continue;
1476 }
1477 if (modtype == NULL((void *)0)) {
1478 printf("Preloaded module at %p does not have a type!\n",
1479 modptr);
1480 continue;
1481 }
1482 if (bootverbose)
1483 printf("Preloaded %s \"%s\" at %p.\n", modtype, modname,
1484 modptr);
1485 lf = NULL((void *)0);
1486 TAILQ_FOREACH(lc, &classes, link)for ((lc) = (((&classes))->tqh_first); (lc); (lc) = ((
(lc))->link.tqe_next)) {
1487 error = LINKER_LINK_PRELOAD(lc, modname, &lf);
1488 if (!error)
1489 break;
1490 lf = NULL((void *)0);
1491 }
1492 if (lf)
1493 TAILQ_INSERT_TAIL(&loaded_files, lf, loaded)do { ; (((lf))->loaded.tqe_next) = ((void *)0); (lf)->loaded
.tqe_prev = (&loaded_files)->tqh_last; *(&loaded_files
)->tqh_last = (lf); (&loaded_files)->tqh_last = &
(((lf))->loaded.tqe_next); ; ; } while (0);
1494 }
1495
1496 /*
1497 * First get a list of stuff in the kernel.
1498 */
1499 if (linker_file_lookup_set(linker_kernel_file, MDT_SETNAME"modmetadata_set", &start,
1500 &stop, NULL((void *)0)) == 0)
1501 linker_addmodules(linker_kernel_file, start, stop, 1);
1502
1503 /*
1504 * This is a once-off kinky bubble sort to resolve relocation
1505 * dependency requirements.
1506 */
1507restart:
1508 TAILQ_FOREACH(lf, &loaded_files, loaded)for ((lf) = (((&loaded_files))->tqh_first); (lf); (lf)
= (((lf))->loaded.tqe_next)) {
1509 error = linker_file_lookup_set(lf, MDT_SETNAME"modmetadata_set", &start,
1510 &stop, NULL((void *)0));
1511 /*
1512 * First, look to see if we would successfully link with this
1513 * stuff.
1514 */
1515 resolves = 1; /* unless we know otherwise */
1516 if (!error) {
1517 for (mdp = start; mdp < stop; mdp++) {
1518 mp = *mdp;
1519 if (mp->md_type != MDT_DEPEND1)
1520 continue;
1521 modname = mp->md_cval;
1522 verinfo = mp->md_data;
1523 for (nmdp = start; nmdp < stop; nmdp++) {
1524 nmp = *nmdp;
1525 if (nmp->md_type != MDT_VERSION3)
1526 continue;
1527 nmodname = nmp->md_cval;
1528 if (strcmp(modname, nmodname) == 0)
1529 break;
1530 }
1531 if (nmdp < stop) /* it's a self reference */
1532 continue;
1533
1534 /*
1535 * ok, the module isn't here yet, we
1536 * are not finished
1537 */
1538 if (modlist_lookup2(modname, verinfo) == NULL((void *)0))
1539 resolves = 0;
1540 }
1541 }
1542 /*
1543 * OK, if we found our modules, we can link. So, "provide"
1544 * the modules inside and add it to the end of the link order
1545 * list.
1546 */
1547 if (resolves) {
1548 if (!error) {
1549 for (mdp = start; mdp < stop; mdp++) {
1550 mp = *mdp;
1551 if (mp->md_type != MDT_VERSION3)
1552 continue;
1553 modname = mp->md_cval;
1554 nver = ((const struct mod_version *)
1555 mp->md_data)->mv_version;
1556 if (modlist_lookup(modname,
1557 nver) != NULL((void *)0)) {
1558 printf("module %s already"
1559 " present!\n", modname);
1560 TAILQ_REMOVE(&loaded_files,do { ; ; ; ; if (((((lf))->loaded.tqe_next)) != ((void *)0
)) (((lf))->loaded.tqe_next)->loaded.tqe_prev = (lf)->
loaded.tqe_prev; else { (&loaded_files)->tqh_last = (lf
)->loaded.tqe_prev; ; } *(lf)->loaded.tqe_prev = (((lf)
)->loaded.tqe_next); ; ; ; } while (0)
1561 lf, loaded)do { ; ; ; ; if (((((lf))->loaded.tqe_next)) != ((void *)0
)) (((lf))->loaded.tqe_next)->loaded.tqe_prev = (lf)->
loaded.tqe_prev; else { (&loaded_files)->tqh_last = (lf
)->loaded.tqe_prev; ; } *(lf)->loaded.tqe_prev = (((lf)
)->loaded.tqe_next); ; ; ; } while (0);
1562 linker_file_unload(lf,
1563 LINKER_UNLOAD_FORCE1);
1564 /* we changed tailq next ptr */
1565 goto restart;
1566 }
1567 modlist_newmodule(modname, nver, lf);
1568 }
1569 }
1570 TAILQ_REMOVE(&loaded_files, lf, loaded)do { ; ; ; ; if (((((lf))->loaded.tqe_next)) != ((void *)0
)) (((lf))->loaded.tqe_next)->loaded.tqe_prev = (lf)->
loaded.tqe_prev; else { (&loaded_files)->tqh_last = (lf
)->loaded.tqe_prev; ; } *(lf)->loaded.tqe_prev = (((lf)
)->loaded.tqe_next); ; ; ; } while (0);
1571 TAILQ_INSERT_TAIL(&depended_files, lf, loaded)do { ; (((lf))->loaded.tqe_next) = ((void *)0); (lf)->loaded
.tqe_prev = (&depended_files)->tqh_last; *(&depended_files
)->tqh_last = (lf); (&depended_files)->tqh_last = &
(((lf))->loaded.tqe_next); ; ; } while (0);
1572 /*
1573 * Since we provided modules, we need to restart the
1574 * sort so that the previous files that depend on us
1575 * have a chance. Also, we've busted the tailq next
1576 * pointer with the REMOVE.
1577 */
1578 goto restart;
1579 }
1580 }
1581
1582 /*
1583 * At this point, we check to see what could not be resolved..
1584 */
1585 while ((lf = TAILQ_FIRST(&loaded_files)((&loaded_files)->tqh_first)) != NULL((void *)0)) {
1586 TAILQ_REMOVE(&loaded_files, lf, loaded)do { ; ; ; ; if (((((lf))->loaded.tqe_next)) != ((void *)0
)) (((lf))->loaded.tqe_next)->loaded.tqe_prev = (lf)->
loaded.tqe_prev; else { (&loaded_files)->tqh_last = (lf
)->loaded.tqe_prev; ; } *(lf)->loaded.tqe_prev = (((lf)
)->loaded.tqe_next); ; ; ; } while (0);
1587 printf("KLD file %s is missing dependencies\n", lf->filename);
1588 linker_file_unload(lf, LINKER_UNLOAD_FORCE1);
1589 }
1590
1591 /*
1592 * We made it. Finish off the linking in the order we determined.
1593 */
1594 TAILQ_FOREACH_SAFE(lf, &depended_files, loaded, nlf)for ((lf) = (((&depended_files))->tqh_first); (lf) &&
((nlf) = (((lf))->loaded.tqe_next), 1); (lf) = (nlf)) {
1595 if (linker_kernel_file) {
1596 linker_kernel_file->refs++;
1597 error = linker_file_add_dependency(lf,
1598 linker_kernel_file);
1599 if (error)
1600 panic("cannot add dependency");
1601 }
1602 lf->userrefs++; /* so we can (try to) kldunload it */
1603 error = linker_file_lookup_set(lf, MDT_SETNAME"modmetadata_set", &start,
1604 &stop, NULL((void *)0));
1605 if (!error) {
1606 for (mdp = start; mdp < stop; mdp++) {
1607 mp = *mdp;
1608 if (mp->md_type != MDT_DEPEND1)
1609 continue;
1610 modname = mp->md_cval;
1611 verinfo = mp->md_data;
1612 mod = modlist_lookup2(modname, verinfo);
1613 if (mod == NULL((void *)0)) {
1614 printf("KLD file %s - cannot find "
1615 "dependency \"%s\"\n",
1616 lf->filename, modname);
1617 goto fail;
1618 }
1619 /* Don't count self-dependencies */
1620 if (lf == mod->container)
1621 continue;
1622 mod->container->refs++;
1623 error = linker_file_add_dependency(lf,
1624 mod->container);
1625 if (error)
1626 panic("cannot add dependency");
1627 }
1628 }
1629 /*
1630 * Now do relocation etc using the symbol search paths
1631 * established by the dependencies
1632 */
1633 error = LINKER_LINK_PRELOAD_FINISH(lf);
1634 if (error) {
1635 printf("KLD file %s - could not finalize loading\n",
1636 lf->filename);
1637 goto fail;
1638 }
1639 linker_file_register_modules(lf);
1640 if (linker_file_lookup_set(lf, "sysinit_set", &si_start,
1641 &si_stop, NULL((void *)0)) == 0)
1642 sysinit_add(si_start, si_stop);
1643 linker_file_register_sysctls(lf);
1644 lf->flags |= LINKER_FILE_LINKED0x1;
1645 continue;
1646fail:
1647 TAILQ_REMOVE(&depended_files, lf, loaded)do { ; ; ; ; if (((((lf))->loaded.tqe_next)) != ((void *)0
)) (((lf))->loaded.tqe_next)->loaded.tqe_prev = (lf)->
loaded.tqe_prev; else { (&depended_files)->tqh_last = (
lf)->loaded.tqe_prev; ; } *(lf)->loaded.tqe_prev = (((lf
))->loaded.tqe_next); ; ; ; } while (0);
1648 linker_file_unload(lf, LINKER_UNLOAD_FORCE1);
1649 }
1650 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
1651 /* woohoo! we made it! */
1652}
1653
1654SYSINIT(preload, SI_SUB_KLD, SI_ORDER_MIDDLE, linker_preload, 0)static struct sysinit preload_sys_init = { SI_SUB_KLD, SI_ORDER_MIDDLE
, (sysinit_cfunc_t)(sysinit_nfunc_t)linker_preload, ((void *)
(0)) }; __asm__(".globl " "__start_set_sysinit_set"); __asm__
(".globl " "__stop_set_sysinit_set"); static void const * const
__set_sysinit_set_sym_preload_sys_init __attribute__((__section__
("set_" "sysinit_set"))) __attribute__((__used__)) = &(preload_sys_init
);
1655
1656/*
1657 * Search for a not-loaded module by name.
1658 *
1659 * Modules may be found in the following locations:
1660 *
1661 * - preloaded (result is just the module name) - on disk (result is full path
1662 * to module)
1663 *
1664 * If the module name is qualified in any way (contains path, etc.) the we
1665 * simply return a copy of it.
1666 *
1667 * The search path can be manipulated via sysctl. Note that we use the ';'
1668 * character as a separator to be consistent with the bootloader.
1669 */
1670
1671static char linker_hintfile[] = "linker.hints";
1672static char linker_path[MAXPATHLEN1024] = "/boot/kernel;/boot/modules";
1673
1674SYSCTL_STRING(_kern, OID_AUTO, module_path, CTLFLAG_RWTUN, linker_path,static struct sysctl_oid sysctl___kern_module_path = { .oid_parent
= ((&(&sysctl___kern)->oid_children)), .oid_children
= { ((void *)0) }, .oid_number = ((-1)), .oid_kind = (3|(((0x80000000
|0x40000000)|0x00080000))), .oid_arg1 = (linker_path), .oid_arg2
= (sizeof(linker_path)), .oid_name = ("module_path"), .oid_handler
= (sysctl_handle_string), .oid_fmt = ("A"), .oid_descr = "module load search path"
}; __asm__(".globl " "__start_set_sysctl_set"); __asm__(".globl "
"__stop_set_sysctl_set"); static void const * const __set_sysctl_set_sym_sysctl___kern_module_path
__attribute__((__section__("set_" "sysctl_set"))) __attribute__
((__used__)) = &(sysctl___kern_module_path); _Static_assert
(((((0x80000000|0x40000000)|0x00080000)) & 0xf) == 0 || (
(((0x80000000|0x40000000)|0x00080000)) & 0) == 3, "compile-time assertion failed"
)
1675 sizeof(linker_path), "module load search path")static struct sysctl_oid sysctl___kern_module_path = { .oid_parent
= ((&(&sysctl___kern)->oid_children)), .oid_children
= { ((void *)0) }, .oid_number = ((-1)), .oid_kind = (3|(((0x80000000
|0x40000000)|0x00080000))), .oid_arg1 = (linker_path), .oid_arg2
= (sizeof(linker_path)), .oid_name = ("module_path"), .oid_handler
= (sysctl_handle_string), .oid_fmt = ("A"), .oid_descr = "module load search path"
}; __asm__(".globl " "__start_set_sysctl_set"); __asm__(".globl "
"__stop_set_sysctl_set"); static void const * const __set_sysctl_set_sym_sysctl___kern_module_path
__attribute__((__section__("set_" "sysctl_set"))) __attribute__
((__used__)) = &(sysctl___kern_module_path); _Static_assert
(((((0x80000000|0x40000000)|0x00080000)) & 0xf) == 0 || (
(((0x80000000|0x40000000)|0x00080000)) & 0) == 3, "compile-time assertion failed"
);
1676
1677TUNABLE_STR("module_path", linker_path, sizeof(linker_path))static struct tunable_str __tunable_str_1677 = { ("module_path"
), (linker_path), (sizeof(linker_path)), }; static struct sysinit
__Tunable_init_1677_sys_init = { SI_SUB_TUNABLES, SI_ORDER_MIDDLE
, (sysinit_cfunc_t)(sysinit_nfunc_t)tunable_str_init, ((void *
)(&__tunable_str_1677)) }; __asm__(".globl " "__start_set_sysinit_set"
); __asm__(".globl " "__stop_set_sysinit_set"); static void const
* const __set_sysinit_set_sym___Tunable_init_1677_sys_init __attribute__
((__section__("set_" "sysinit_set"))) __attribute__((__used__
)) = &(__Tunable_init_1677_sys_init);
1678
1679static char *linker_ext_list[] = {
1680 "",
1681 ".ko",
1682 NULL((void *)0)
1683};
1684
1685/*
1686 * Check if file actually exists either with or without extension listed in
1687 * the linker_ext_list. (probably should be generic for the rest of the
1688 * kernel)
1689 */
1690static char *
1691linker_lookup_file(const char *path, int pathlen, const char *name,
1692 int namelen, struct vattr *vap)
1693{
1694 struct nameidata nd;
1695 struct thread *td = curthread(__curthread()); /* XXX */
1696 char *result, **cpp, *sep;
1697 int error, len, extlen, reclen, flags;
1698 enum vtype type;
1699
1700 extlen = 0;
1701 for (cpp = linker_ext_list; *cpp; cpp++) {
1702 len = strlen(*cpp);
1703 if (len > extlen)
1704 extlen = len;
1705 }
1706 extlen++; /* trailing '\0' */
1707 sep = (path[pathlen - 1] != '/') ? "/" : "";
1708
1709 reclen = pathlen + strlen(sep) + namelen + extlen + 1;
1710 result = malloc(reclen, M_LINKER, M_WAITOK0x0002);
1711 for (cpp = linker_ext_list; *cpp; cpp++) {
1712 snprintf(result, reclen, "%.*s%s%.*s%s", pathlen, path, sep,
1713 namelen, name, *cpp);
1714 /*
1715 * Attempt to open the file, and return the path if
1716 * we succeed and it's a regular file.
1717 */
1718 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, result, td)NDINIT_ALL(&nd, 0, 0x0040, UIO_SYSSPACE, result, -100, ((
void *)0), 0, td);
1719 flags = FREAD0x0001;
1720 error = vn_open(&nd, &flags, 0, NULL((void *)0));
1721 if (error == 0) {
1722 NDFREE(&nd, NDF_ONLY_PNBUF(~0x00000020));
1723 type = nd.ni_vp->v_type;
1724 if (vap)
1725 VOP_GETATTR(nd.ni_vp, vap, td->td_ucred);
1726 VOP_UNLOCK(nd.ni_vp, 0);
1727 vn_close(nd.ni_vp, FREAD0x0001, td->td_ucred, td);
1728 if (type == VREG)
1729 return (result);
1730 }
1731 }
1732 free(result, M_LINKER);
1733 return (NULL((void *)0));
1734}
1735
1736#define INT_ALIGN(base, ptr)ptr = (base) + ((((ptr) - (base))+((sizeof(int))-1))&(~((
sizeof(int))-1))) ptr = \
1737 (base) + roundup2((ptr) - (base), sizeof(int))((((ptr) - (base))+((sizeof(int))-1))&(~((sizeof(int))-1)
))
1738
1739/*
1740 * Lookup KLD which contains requested module in the "linker.hints" file. If
1741 * version specification is available, then try to find the best KLD.
1742 * Otherwise just find the latest one.
1743 */
1744static char *
1745linker_hints_lookup(const char *path, int pathlen, const char *modname,
1746 int modnamelen, const struct mod_depend *verinfo)
1747{
1748 struct thread *td = curthread(__curthread()); /* XXX */
1749 struct ucred *cred = td ? td->td_ucred : NULL((void *)0);
1750 struct nameidata nd;
1751 struct vattr vattr, mattr;
1752 u_char *hints = NULL((void *)0);
1753 u_char *cp, *recptr, *bufend, *result, *best, *pathbuf, *sep;
1754 int error, ival, bestver, *intp, found, flags, clen, blen;
1755 ssize_t reclen;
1756
1757 result = NULL((void *)0);
1758 bestver = found = 0;
1759
1760 sep = (path[pathlen - 1] != '/') ? "/" : "";
1761 reclen = imax(modnamelen, strlen(linker_hintfile)) + pathlen +
1762 strlen(sep) + 1;
1763 pathbuf = malloc(reclen, M_LINKER, M_WAITOK0x0002);
1764 snprintf(pathbuf, reclen, "%.*s%s%s", pathlen, path, sep,
1765 linker_hintfile);
1766
1767 NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_SYSSPACE, pathbuf, td)NDINIT_ALL(&nd, 0, 0x0000, UIO_SYSSPACE, pathbuf, -100, (
(void *)0), 0, td);
1768 flags = FREAD0x0001;
1769 error = vn_open(&nd, &flags, 0, NULL((void *)0));
1770 if (error)
1771 goto bad;
1772 NDFREE(&nd, NDF_ONLY_PNBUF(~0x00000020));
1773 if (nd.ni_vp->v_type != VREG)
1774 goto bad;
1775 best = cp = NULL((void *)0);
1776 error = VOP_GETATTR(nd.ni_vp, &vattr, cred);
1777 if (error)
1778 goto bad;
1779 /*
1780 * XXX: we need to limit this number to some reasonable value
1781 */
1782 if (vattr.va_size > LINKER_HINTS_MAX(1 << 20)) {
1783 printf("hints file too large %ld\n", (long)vattr.va_size);
1784 goto bad;
1785 }
1786 hints = malloc(vattr.va_size, M_TEMP, M_WAITOK0x0002);
1787 error = vn_rdwr(UIO_READ, nd.ni_vp, (caddr_t)hints, vattr.va_size, 0,
1788 UIO_SYSSPACE, IO_NODELOCKED0x0008, cred, NOCRED((struct ucred *)0), &reclen, td);
1789 if (error)
1790 goto bad;
1791 VOP_UNLOCK(nd.ni_vp, 0);
1792 vn_close(nd.ni_vp, FREAD0x0001, cred, td);
1793 nd.ni_vp = NULL((void *)0);
1794 if (reclen != 0) {
1795 printf("can't read %zd\n", reclen);
1796 goto bad;
1797 }
1798 intp = (int *)hints;
1799 ival = *intp++;
1800 if (ival != LINKER_HINTS_VERSION1) {
1801 printf("hints file version mismatch %d\n", ival);
1802 goto bad;
1803 }
1804 bufend = hints + vattr.va_size;
1805 recptr = (u_char *)intp;
1806 clen = blen = 0;
1807 while (recptr < bufend && !found) {
1808 intp = (int *)recptr;
1809 reclen = *intp++;
1810 ival = *intp++;
1811 cp = (char *)intp;
1812 switch (ival) {
1813 case MDT_VERSION3:
1814 clen = *cp++;
1815 if (clen != modnamelen || bcmp(cp, modname, clen) != 0)
1816 break;
1817 cp += clen;
1818 INT_ALIGN(hints, cp)cp = (hints) + ((((cp) - (hints))+((sizeof(int))-1))&(~((
sizeof(int))-1)));
1819 ival = *(int *)cp;
1820 cp += sizeof(int);
1821 clen = *cp++;
1822 if (verinfo == NULL((void *)0) ||
1823 ival == verinfo->md_ver_preferred) {
1824 found = 1;
1825 break;
1826 }
1827 if (ival >= verinfo->md_ver_minimum &&
1828 ival <= verinfo->md_ver_maximum &&
1829 ival > bestver) {
1830 bestver = ival;
1831 best = cp;
1832 blen = clen;
1833 }
1834 break;
1835 default:
1836 break;
1837 }
1838 recptr += reclen + sizeof(int);
1839 }
1840 /*
1841 * Finally check if KLD is in the place
1842 */
1843 if (found)
1844 result = linker_lookup_file(path, pathlen, cp, clen, &mattr);
1845 else if (best)
1846 result = linker_lookup_file(path, pathlen, best, blen, &mattr);
1847
1848 /*
1849 * KLD is newer than hints file. What we should do now?
1850 */
1851 if (result && timespeccmp(&mattr.va_mtime, &vattr.va_mtime, >)(((&mattr.va_mtime)->tv_sec == (&vattr.va_mtime)->
tv_sec) ? ((&mattr.va_mtime)->tv_nsec > (&vattr
.va_mtime)->tv_nsec) : ((&mattr.va_mtime)->tv_sec >
(&vattr.va_mtime)->tv_sec)))
1852 printf("warning: KLD '%s' is newer than the linker.hints"
1853 " file\n", result);
1854bad:
1855 free(pathbuf, M_LINKER);
1856 if (hints)
1857 free(hints, M_TEMP);
1858 if (nd.ni_vp != NULL((void *)0)) {
1859 VOP_UNLOCK(nd.ni_vp, 0);
1860 vn_close(nd.ni_vp, FREAD0x0001, cred, td);
1861 }
1862 /*
1863 * If nothing found or hints is absent - fallback to the old
1864 * way by using "kldname[.ko]" as module name.
1865 */
1866 if (!found && !bestver && result == NULL((void *)0))
1867 result = linker_lookup_file(path, pathlen, modname,
1868 modnamelen, NULL((void *)0));
1869 return (result);
1870}
1871
1872/*
1873 * Lookup KLD which contains requested module in the all directories.
1874 */
1875static char *
1876linker_search_module(const char *modname, int modnamelen,
1877 const struct mod_depend *verinfo)
1878{
1879 char *cp, *ep, *result;
1880
1881 /*
1882 * traverse the linker path
1883 */
1884 for (cp = linker_path; *cp; cp = ep + 1) {
1885 /* find the end of this component */
1886 for (ep = cp; (*ep != 0) && (*ep != ';'); ep++);
1887 result = linker_hints_lookup(cp, ep - cp, modname,
1888 modnamelen, verinfo);
1889 if (result != NULL((void *)0))
1890 return (result);
1891 if (*ep == 0)
1892 break;
1893 }
1894 return (NULL((void *)0));
1895}
1896
1897/*
1898 * Search for module in all directories listed in the linker_path.
1899 */
1900static char *
1901linker_search_kld(const char *name)
1902{
1903 char *cp, *ep, *result;
1904 int len;
1905
1906 /* qualified at all? */
1907 if (strchr(name, '/'))
1908 return (strdup(name, M_LINKER));
1909
1910 /* traverse the linker path */
1911 len = strlen(name);
1912 for (ep = linker_path; *ep; ep++) {
1913 cp = ep;
1914 /* find the end of this component */
1915 for (; *ep != 0 && *ep != ';'; ep++);
1916 result = linker_lookup_file(cp, ep - cp, name, len, NULL((void *)0));
1917 if (result != NULL((void *)0))
1918 return (result);
1919 }
1920 return (NULL((void *)0));
1921}
1922
1923static const char *
1924linker_basename(const char *path)
1925{
1926 const char *filename;
1927
1928 filename = strrchr(path, '/');
1929 if (filename == NULL((void *)0))
1930 return path;
1931 if (filename[1])
1932 filename++;
1933 return (filename);
1934}
1935
1936#ifdef HWPMC_HOOKS1
1937/*
1938 * Inform hwpmc about the set of kernel modules currently loaded.
1939 */
1940void *
1941linker_hwpmc_list_objects(void)
1942{
1943 linker_file_t lf;
1944 struct pmckern_map_in *kobase;
1945 int i, nmappings;
1946
1947 nmappings = 0;
1948 sx_slock(&kld_sx)(void)__sx_slock(((&kld_sx)), 0, (((void *)0)), (0));
1949 TAILQ_FOREACH(lf, &linker_files, link)for ((lf) = (((&linker_files))->tqh_first); (lf); (lf)
= (((lf))->link.tqe_next))
1950 nmappings++;
1951
1952 /* Allocate nmappings + 1 entries. */
1953 kobase = malloc((nmappings + 1) * sizeof(struct pmckern_map_in),
1954 M_LINKER, M_WAITOK0x0002 | M_ZERO0x0100);
1955 i = 0;
1956 TAILQ_FOREACH(lf, &linker_files, link)for ((lf) = (((&linker_files))->tqh_first); (lf); (lf)
= (((lf))->link.tqe_next)) {
1957
1958 /* Save the info for this linker file. */
1959 kobase[i].pm_file = lf->filename;
1960 kobase[i].pm_address = (uintptr_t)lf->address;
1961 i++;
1962 }
1963 sx_sunlock(&kld_sx)__sx_sunlock(((&kld_sx)), (((void *)0)), (0));
1964
1965 KASSERT(i > 0, ("linker_hpwmc_list_objects: no kernel objects?"))do { } while (0);
1966
1967 /* The last entry of the malloced area comprises of all zeros. */
1968 KASSERT(kobase[i].pm_file == NULL,do { } while (0)
1969 ("linker_hwpmc_list_objects: last object not NULL"))do { } while (0);
1970
1971 return ((void *)kobase);
1972}
1973#endif
1974
1975/*
1976 * Find a file which contains given module and load it, if "parent" is not
1977 * NULL, register a reference to it.
1978 */
1979static int
1980linker_load_module(const char *kldname, const char *modname,
1981 struct linker_file *parent, const struct mod_depend *verinfo,
1982 struct linker_file **lfpp)
1983{
1984 linker_file_t lfdep;
1985 const char *filename;
1986 char *pathname;
1987 int error;
1988
1989 sx_assert(&kld_sx, SA_XLOCKED)(void)0;
1990 if (modname == NULL((void *)0)) {
1991 /*
1992 * We have to load KLD
1993 */
1994 KASSERT(verinfo == NULL, ("linker_load_module: verinfo"do { } while (0)
1995 " is not NULL"))do { } while (0);
1996 pathname = linker_search_kld(kldname);
1997 } else {
1998 if (modlist_lookup2(modname, verinfo) != NULL((void *)0))
1999 return (EEXIST17);
2000 if (kldname != NULL((void *)0))
2001 pathname = strdup(kldname, M_LINKER);
2002 else if (rootvnode == NULL((void *)0))
2003 pathname = NULL((void *)0);
2004 else
2005 /*
2006 * Need to find a KLD with required module
2007 */
2008 pathname = linker_search_module(modname,
2009 strlen(modname), verinfo);
2010 }
2011 if (pathname == NULL((void *)0))
2012 return (ENOENT2);
2013
2014 /*
2015 * Can't load more than one file with the same basename XXX:
2016 * Actually it should be possible to have multiple KLDs with
2017 * the same basename but different path because they can
2018 * provide different versions of the same modules.
2019 */
2020 filename = linker_basename(pathname);
2021 if (linker_find_file_by_name(filename))
2022 error = EEXIST17;
2023 else do {
2024 error = linker_load_file(pathname, &lfdep);
2025 if (error)
2026 break;
2027 if (modname && verinfo &&
2028 modlist_lookup2(modname, verinfo) == NULL((void *)0)) {
2029 linker_file_unload(lfdep, LINKER_UNLOAD_FORCE1);
2030 error = ENOENT2;
2031 break;
2032 }
2033 if (parent) {
2034 error = linker_file_add_dependency(parent, lfdep);
2035 if (error)
2036 break;
2037 }
2038 if (lfpp)
2039 *lfpp = lfdep;
2040 } while (0);
2041 free(pathname, M_LINKER);
2042 return (error);
2043}
2044
2045/*
2046 * This routine is responsible for finding dependencies of userland initiated
2047 * kldload(2)'s of files.
2048 */
2049int
2050linker_load_dependencies(linker_file_t lf)
2051{
2052 linker_file_t lfdep;
2053 struct mod_metadata **start, **stop, **mdp, **nmdp;
2054 struct mod_metadata *mp, *nmp;
2055 const struct mod_depend *verinfo;
2056 modlist_t mod;
2057 const char *modname, *nmodname;
2058 int ver, error = 0, count;
2059
2060 /*
2061 * All files are dependent on /kernel.
2062 */
2063 sx_assert(&kld_sx, SA_XLOCKED)(void)0;
2064 if (linker_kernel_file) {
2065 linker_kernel_file->refs++;
2066 error = linker_file_add_dependency(lf, linker_kernel_file);
2067 if (error)
2068 return (error);
2069 }
2070 if (linker_file_lookup_set(lf, MDT_SETNAME"modmetadata_set", &start, &stop,
2071 &count) != 0)
2072 return (0);
2073 for (mdp = start; mdp < stop; mdp++) {
2074 mp = *mdp;
2075 if (mp->md_type != MDT_VERSION3)
2076 continue;
2077 modname = mp->md_cval;
2078 ver = ((const struct mod_version *)mp->md_data)->mv_version;
2079 mod = modlist_lookup(modname, ver);
2080 if (mod != NULL((void *)0)) {
2081 printf("interface %s.%d already present in the KLD"
2082 " '%s'!\n", modname, ver,
2083 mod->container->filename);
2084 return (EEXIST17);
2085 }
2086 }
2087
2088 for (mdp = start; mdp < stop; mdp++) {
2089 mp = *mdp;
2090 if (mp->md_type != MDT_DEPEND1)
2091 continue;
2092 modname = mp->md_cval;
2093 verinfo = mp->md_data;
2094 nmodname = NULL((void *)0);
2095 for (nmdp = start; nmdp < stop; nmdp++) {
2096 nmp = *nmdp;
2097 if (nmp->md_type != MDT_VERSION3)
2098 continue;
2099 nmodname = nmp->md_cval;
2100 if (strcmp(modname, nmodname) == 0)
2101 break;
2102 }
2103 if (nmdp < stop)/* early exit, it's a self reference */
2104 continue;
2105 mod = modlist_lookup2(modname, verinfo);
2106 if (mod) { /* woohoo, it's loaded already */
2107 lfdep = mod->container;
2108 lfdep->refs++;
2109 error = linker_file_add_dependency(lf, lfdep);
2110 if (error)
2111 break;
2112 continue;
2113 }
2114 error = linker_load_module(NULL((void *)0), modname, lf, verinfo, NULL((void *)0));
2115 if (error) {
2116 printf("KLD %s: depends on %s - not available or"
2117 " version mismatch\n", lf->filename, modname);
2118 break;
2119 }
2120 }
2121
2122 if (error)
2123 return (error);
2124 linker_addmodules(lf, start, stop, 0);
2125 return (error);
2126}
2127
2128static int
2129sysctl_kern_function_list_iterate(const char *name, void *opaque)
2130{
2131 struct sysctl_req *req;
2132
2133 req = opaque;
2134 return (SYSCTL_OUT(req, name, strlen(name) + 1)(req->oldfunc)(req, name, strlen(name) + 1));
2135}
2136
2137/*
2138 * Export a nul-separated, double-nul-terminated list of all function names
2139 * in the kernel.
2140 */
2141static int
2142sysctl_kern_function_list(SYSCTL_HANDLER_ARGSstruct sysctl_oid *oidp, void *arg1, intmax_t arg2, struct sysctl_req
*req)
2143{
2144 linker_file_t lf;
2145 int error;
2146
2147#ifdef MAC1
2148 error = mac_kld_check_stat(req->td->td_ucred);
2149 if (error)
2150 return (error);
2151#endif
2152 error = sysctl_wire_old_buffer(req, 0);
2153 if (error != 0)
2154 return (error);
2155 sx_xlock(&kld_sx)(void)__sx_xlock(((&kld_sx)), (__curthread()), 0, (((void
*)0)), (0));
2156 TAILQ_FOREACH(lf, &linker_files, link)for ((lf) = (((&linker_files))->tqh_first); (lf); (lf)
= (((lf))->link.tqe_next)) {
2157 error = LINKER_EACH_FUNCTION_NAME(lf,
2158 sysctl_kern_function_list_iterate, req);
2159 if (error) {
2160 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
2161 return (error);
2162 }
2163 }
2164 sx_xunlock(&kld_sx)__sx_xunlock(((&kld_sx)), (__curthread()), (((void *)0)),
(0));
2165 return (SYSCTL_OUT(req, "", 1)(req->oldfunc)(req, "", 1));
2166}
2167
2168SYSCTL_PROC(_kern, OID_AUTO, function_list, CTLTYPE_OPAQUE | CTLFLAG_RD,static struct sysctl_oid sysctl___kern_function_list = { .oid_parent
= ((&(&sysctl___kern)->oid_children)), .oid_children
= { ((void *)0) }, .oid_number = ((-1)), .oid_kind = ((5 | 0x80000000
)), .oid_arg1 = (((void *)0)), .oid_arg2 = (0), .oid_name = (
"function_list"), .oid_handler = (sysctl_kern_function_list),
.oid_fmt = (""), .oid_descr = "kernel function list" }; __asm__
(".globl " "__start_set_sysctl_set"); __asm__(".globl " "__stop_set_sysctl_set"
); static void const * const __set_sysctl_set_sym_sysctl___kern_function_list
__attribute__((__section__("set_" "sysctl_set"))) __attribute__
((__used__)) = &(sysctl___kern_function_list); _Static_assert
(((5 | 0x80000000) & 0xf) != 0, "compile-time assertion failed"
)
2169 NULL, 0, sysctl_kern_function_list, "", "kernel function list")static struct sysctl_oid sysctl___kern_function_list = { .oid_parent
= ((&(&sysctl___kern)->oid_children)), .oid_children
= { ((void *)0) }, .oid_number = ((-1)), .oid_kind = ((5 | 0x80000000
)), .oid_arg1 = (((void *)0)), .oid_arg2 = (0), .oid_name = (
"function_list"), .oid_handler = (sysctl_kern_function_list),
.oid_fmt = (""), .oid_descr = "kernel function list" }; __asm__
(".globl " "__start_set_sysctl_set"); __asm__(".globl " "__stop_set_sysctl_set"
); static void const * const __set_sysctl_set_sym_sysctl___kern_function_list
__attribute__((__section__("set_" "sysctl_set"))) __attribute__
((__used__)) = &(sysctl___kern_function_list); _Static_assert
(((5 | 0x80000000) & 0xf) != 0, "compile-time assertion failed"
);