1898b0535SWarner Losh /*-
27f2d13d6SPedro F. Giffuni * SPDX-License-Identifier: BSD-3-Clause
37f2d13d6SPedro F. Giffuni *
4d66a5066SPeter Wemm * Copyright (c) 1994 Christos Zoulas
5d66a5066SPeter Wemm * Copyright (c) 1995 Frank van der Linden
6d66a5066SPeter Wemm * Copyright (c) 1995 Scott Bartram
7d66a5066SPeter Wemm * All rights reserved.
8d66a5066SPeter Wemm *
9d66a5066SPeter Wemm * Redistribution and use in source and binary forms, with or without
10d66a5066SPeter Wemm * modification, are permitted provided that the following conditions
11d66a5066SPeter Wemm * are met:
12d66a5066SPeter Wemm * 1. Redistributions of source code must retain the above copyright
13d66a5066SPeter Wemm * notice, this list of conditions and the following disclaimer.
14d66a5066SPeter Wemm * 2. Redistributions in binary form must reproduce the above copyright
15d66a5066SPeter Wemm * notice, this list of conditions and the following disclaimer in the
16d66a5066SPeter Wemm * documentation and/or other materials provided with the distribution.
17d66a5066SPeter Wemm * 3. The name of the author may not be used to endorse or promote products
18d66a5066SPeter Wemm * derived from this software without specific prior written permission
19d66a5066SPeter Wemm *
20d66a5066SPeter Wemm * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21d66a5066SPeter Wemm * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22d66a5066SPeter Wemm * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23d66a5066SPeter Wemm * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24d66a5066SPeter Wemm * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25d66a5066SPeter Wemm * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26d66a5066SPeter Wemm * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27d66a5066SPeter Wemm * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28d66a5066SPeter Wemm * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29d66a5066SPeter Wemm * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30d66a5066SPeter Wemm *
31d66a5066SPeter Wemm * from: svr4_util.c,v 1.5 1995/01/22 23:44:50 christos Exp
32d66a5066SPeter Wemm */
33d66a5066SPeter Wemm
34d66a5066SPeter Wemm #include <sys/param.h>
35060e4882SDoug Ambrisko #include <sys/bus.h>
361a34e9faSEdward Tomasz Napierala #include <sys/conf.h>
3757b4252eSKonstantin Belousov #include <sys/fcntl.h>
388ec6c4a3SAlexander Leidinger #include <sys/jail.h>
39d4364109SBruce Evans #include <sys/malloc.h>
40d66a5066SPeter Wemm #include <sys/namei.h>
41d66a5066SPeter Wemm #include <sys/proc.h>
426072eea0SDmitry Chagin #include <sys/stat.h>
4325771ec2SJohn Baldwin #include <sys/syscallsubr.h>
44d66a5066SPeter Wemm #include <sys/vnode.h>
45d66a5066SPeter Wemm
46e15583ceSAlfred Perlstein #include <machine/stdarg.h>
47e15583ceSAlfred Perlstein
4877fb6b66STijl Coosemans #include <compat/linux/linux_dtrace.h>
49b5f20658SEdward Tomasz Napierala #include <compat/linux/linux_mib.h>
50ac951e62SMarcel Moolenaar #include <compat/linux/linux_util.h>
51762e6b85SEivind Eklund
5267d39748SDmitry Chagin MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures");
53e16fe1c7SDmitry Chagin MALLOC_DEFINE(M_EPOLL, "lepoll", "Linux events structures");
5419e252baSAlexander Leidinger
5577fb6b66STijl Coosemans FEATURE(linuxulator_v4l, "V4L ioctl wrapper support in the linuxulator");
5677fb6b66STijl Coosemans FEATURE(linuxulator_v4l2, "V4L2 ioctl wrapper support in the linuxulator");
5777fb6b66STijl Coosemans
5877fb6b66STijl Coosemans /**
5977fb6b66STijl Coosemans * Special DTrace provider for the linuxulator.
6077fb6b66STijl Coosemans *
6177fb6b66STijl Coosemans * In this file we define the provider for the entire linuxulator. All
6277fb6b66STijl Coosemans * modules (= files of the linuxulator) use it.
6377fb6b66STijl Coosemans *
6477fb6b66STijl Coosemans * We define a different name depending on the emulated bitsize, see
6577fb6b66STijl Coosemans * ../../<ARCH>/linux{,32}/linux.h, e.g.:
6677fb6b66STijl Coosemans * native bitsize = linuxulator
6777fb6b66STijl Coosemans * amd64, 32bit emulation = linuxulator32
6877fb6b66STijl Coosemans */
6977fb6b66STijl Coosemans LIN_SDT_PROVIDER_DEFINE(linuxulator);
7077fb6b66STijl Coosemans LIN_SDT_PROVIDER_DEFINE(linuxulator32);
7177fb6b66STijl Coosemans
72b5f20658SEdward Tomasz Napierala char linux_emul_path[MAXPATHLEN] = "/compat/linux";
73b5f20658SEdward Tomasz Napierala
74b5f20658SEdward Tomasz Napierala SYSCTL_STRING(_compat_linux, OID_AUTO, emul_path, CTLFLAG_RWTUN,
75b5f20658SEdward Tomasz Napierala linux_emul_path, sizeof(linux_emul_path),
76b5f20658SEdward Tomasz Napierala "Linux runtime environment path");
77d66a5066SPeter Wemm
78d66a5066SPeter Wemm int
linux_pwd_onexec(struct thread * td)79fd745e1dSDmitry Chagin linux_pwd_onexec(struct thread *td)
80ff766321SIan Dowse {
81fd745e1dSDmitry Chagin struct nameidata nd;
82fd745e1dSDmitry Chagin int error;
83d66a5066SPeter Wemm
84fd745e1dSDmitry Chagin NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, linux_emul_path);
85fd745e1dSDmitry Chagin error = namei(&nd);
86fd745e1dSDmitry Chagin if (error != 0) {
8799fa799aSKonstantin Belousov /* Do not prevent execution if altroot is non-existent. */
8899fa799aSKonstantin Belousov pwd_altroot(td, NULL);
89fd745e1dSDmitry Chagin return (0);
90fd745e1dSDmitry Chagin }
91fd745e1dSDmitry Chagin NDFREE_PNBUF(&nd);
92fd745e1dSDmitry Chagin pwd_altroot(td, nd.ni_vp);
93fd745e1dSDmitry Chagin vrele(nd.ni_vp);
94fd745e1dSDmitry Chagin return (0);
95fd745e1dSDmitry Chagin }
9619e252baSAlexander Leidinger
97fd745e1dSDmitry Chagin void
linux_pwd_onexec_native(struct thread * td)98fd745e1dSDmitry Chagin linux_pwd_onexec_native(struct thread *td)
99fd745e1dSDmitry Chagin {
100fd745e1dSDmitry Chagin
101fd745e1dSDmitry Chagin pwd_altroot(td, NULL);
102d66a5066SPeter Wemm }
103e15583ceSAlfred Perlstein
104e15583ceSAlfred Perlstein void
linux_msg(const struct thread * td,const char * fmt,...)105e15583ceSAlfred Perlstein linux_msg(const struct thread *td, const char *fmt, ...)
106e15583ceSAlfred Perlstein {
107e15583ceSAlfred Perlstein va_list ap;
108e15583ceSAlfred Perlstein struct proc *p;
109e15583ceSAlfred Perlstein
110462171d9SEdward Tomasz Napierala if (linux_debug == 0)
111462171d9SEdward Tomasz Napierala return;
112462171d9SEdward Tomasz Napierala
113e15583ceSAlfred Perlstein p = td->td_proc;
1148ec6c4a3SAlexander Leidinger printf("linux: jid %d pid %d (%s): ", p->p_ucred->cr_prison->pr_id,
1158ec6c4a3SAlexander Leidinger (int)p->p_pid, p->p_comm);
116e15583ceSAlfred Perlstein va_start(ap, fmt);
117e15583ceSAlfred Perlstein vprintf(fmt, ap);
118e15583ceSAlfred Perlstein va_end(ap);
119e15583ceSAlfred Perlstein printf("\n");
120e15583ceSAlfred Perlstein }
121060e4882SDoug Ambrisko
122060e4882SDoug Ambrisko struct device_element
123060e4882SDoug Ambrisko {
124060e4882SDoug Ambrisko TAILQ_ENTRY(device_element) list;
125060e4882SDoug Ambrisko struct linux_device_handler entry;
126060e4882SDoug Ambrisko };
127060e4882SDoug Ambrisko
128060e4882SDoug Ambrisko static TAILQ_HEAD(, device_element) devices =
129060e4882SDoug Ambrisko TAILQ_HEAD_INITIALIZER(devices);
130060e4882SDoug Ambrisko
131060e4882SDoug Ambrisko static struct linux_device_handler null_handler =
132060e4882SDoug Ambrisko { "mem", "mem", "null", "null", 1, 3, 1};
133060e4882SDoug Ambrisko
134060e4882SDoug Ambrisko DATA_SET(linux_device_handler_set, null_handler);
135060e4882SDoug Ambrisko
136060e4882SDoug Ambrisko char *
linux_driver_get_name_dev(device_t dev)137060e4882SDoug Ambrisko linux_driver_get_name_dev(device_t dev)
138060e4882SDoug Ambrisko {
139060e4882SDoug Ambrisko struct device_element *de;
140060e4882SDoug Ambrisko const char *device_name = device_get_name(dev);
141060e4882SDoug Ambrisko
14267d39748SDmitry Chagin if (device_name == NULL)
143340f4a8dSEd Maste return (NULL);
144060e4882SDoug Ambrisko TAILQ_FOREACH(de, &devices, list) {
14567d39748SDmitry Chagin if (strcmp(device_name, de->entry.bsd_driver_name) == 0)
146060e4882SDoug Ambrisko return (de->entry.linux_driver_name);
147060e4882SDoug Ambrisko }
148060e4882SDoug Ambrisko
14967d39748SDmitry Chagin return (NULL);
150060e4882SDoug Ambrisko }
151060e4882SDoug Ambrisko
152060e4882SDoug Ambrisko int
linux_driver_get_major_minor(const char * node,int * major,int * minor)1537870adb6SEd Schouten linux_driver_get_major_minor(const char *node, int *major, int *minor)
154060e4882SDoug Ambrisko {
155060e4882SDoug Ambrisko struct device_element *de;
1562d347b2eSConrad Meyer unsigned long devno;
157f3792e07STijl Coosemans size_t sz;
158060e4882SDoug Ambrisko
15967d39748SDmitry Chagin if (node == NULL || major == NULL || minor == NULL)
160340f4a8dSEd Maste return (1);
161a147e6caSEd Schouten
162f3792e07STijl Coosemans sz = sizeof("pts/") - 1;
163f3792e07STijl Coosemans if (strncmp(node, "pts/", sz) == 0 && node[sz] != '\0') {
164a147e6caSEd Schouten /*
165a147e6caSEd Schouten * Linux checks major and minors of the slave device
166a147e6caSEd Schouten * to make sure it's a pty device, so let's make him
167a147e6caSEd Schouten * believe it is.
168a147e6caSEd Schouten */
169f3792e07STijl Coosemans devno = strtoul(node + sz, NULL, 10);
170a147e6caSEd Schouten *major = 136 + (devno / 256);
171a147e6caSEd Schouten *minor = devno % 256;
17267d39748SDmitry Chagin return (0);
173a147e6caSEd Schouten }
174a147e6caSEd Schouten
175834804f3STijl Coosemans sz = sizeof("dri/card") - 1;
176834804f3STijl Coosemans if (strncmp(node, "dri/card", sz) == 0 && node[sz] != '\0') {
177834804f3STijl Coosemans devno = strtoul(node + sz, NULL, 10);
178834804f3STijl Coosemans *major = 226 + (devno / 256);
179834804f3STijl Coosemans *minor = devno % 256;
180834804f3STijl Coosemans return (0);
181834804f3STijl Coosemans }
182834804f3STijl Coosemans sz = sizeof("dri/controlD") - 1;
183834804f3STijl Coosemans if (strncmp(node, "dri/controlD", sz) == 0 && node[sz] != '\0') {
184834804f3STijl Coosemans devno = strtoul(node + sz, NULL, 10);
185834804f3STijl Coosemans *major = 226 + (devno / 256);
186834804f3STijl Coosemans *minor = devno % 256;
187834804f3STijl Coosemans return (0);
188834804f3STijl Coosemans }
189834804f3STijl Coosemans sz = sizeof("dri/renderD") - 1;
190834804f3STijl Coosemans if (strncmp(node, "dri/renderD", sz) == 0 && node[sz] != '\0') {
191834804f3STijl Coosemans devno = strtoul(node + sz, NULL, 10);
192834804f3STijl Coosemans *major = 226 + (devno / 256);
193834804f3STijl Coosemans *minor = devno % 256;
194834804f3STijl Coosemans return (0);
195834804f3STijl Coosemans }
196f3792e07STijl Coosemans sz = sizeof("drm/") - 1;
197f3792e07STijl Coosemans if (strncmp(node, "drm/", sz) == 0 && node[sz] != '\0') {
198f3792e07STijl Coosemans devno = strtoul(node + sz, NULL, 10);
1992d347b2eSConrad Meyer *major = 226 + (devno / 256);
2002d347b2eSConrad Meyer *minor = devno % 256;
2012d347b2eSConrad Meyer return (0);
2022d347b2eSConrad Meyer }
2032d347b2eSConrad Meyer
204060e4882SDoug Ambrisko TAILQ_FOREACH(de, &devices, list) {
205060e4882SDoug Ambrisko if (strcmp(node, de->entry.bsd_device_name) == 0) {
206060e4882SDoug Ambrisko *major = de->entry.linux_major;
207060e4882SDoug Ambrisko *minor = de->entry.linux_minor;
20867d39748SDmitry Chagin return (0);
209060e4882SDoug Ambrisko }
210060e4882SDoug Ambrisko }
211060e4882SDoug Ambrisko
21267d39748SDmitry Chagin return (1);
213060e4882SDoug Ambrisko }
214060e4882SDoug Ambrisko
2151a34e9faSEdward Tomasz Napierala int
linux_vn_get_major_minor(const struct vnode * vp,int * major,int * minor)2161a34e9faSEdward Tomasz Napierala linux_vn_get_major_minor(const struct vnode *vp, int *major, int *minor)
2171a34e9faSEdward Tomasz Napierala {
2181a34e9faSEdward Tomasz Napierala int error;
2191a34e9faSEdward Tomasz Napierala
2201a34e9faSEdward Tomasz Napierala if (vp->v_type != VCHR)
2211a34e9faSEdward Tomasz Napierala return (ENOTBLK);
2221a34e9faSEdward Tomasz Napierala dev_lock();
2231a34e9faSEdward Tomasz Napierala if (vp->v_rdev == NULL) {
2241a34e9faSEdward Tomasz Napierala dev_unlock();
2251a34e9faSEdward Tomasz Napierala return (ENXIO);
2261a34e9faSEdward Tomasz Napierala }
2271a34e9faSEdward Tomasz Napierala error = linux_driver_get_major_minor(devtoname(vp->v_rdev),
2281a34e9faSEdward Tomasz Napierala major, minor);
2291a34e9faSEdward Tomasz Napierala dev_unlock();
2301a34e9faSEdward Tomasz Napierala return (error);
2311a34e9faSEdward Tomasz Napierala }
2321a34e9faSEdward Tomasz Napierala
2336072eea0SDmitry Chagin void
translate_vnhook_major_minor(struct vnode * vp,struct stat * sb)2346072eea0SDmitry Chagin translate_vnhook_major_minor(struct vnode *vp, struct stat *sb)
2356072eea0SDmitry Chagin {
2366072eea0SDmitry Chagin int major, minor;
2376072eea0SDmitry Chagin
2386072eea0SDmitry Chagin if (vn_isdisk(vp)) {
2396072eea0SDmitry Chagin sb->st_mode &= ~S_IFMT;
2406072eea0SDmitry Chagin sb->st_mode |= S_IFBLK;
2416072eea0SDmitry Chagin }
2426072eea0SDmitry Chagin
2436072eea0SDmitry Chagin /*
2446072eea0SDmitry Chagin * Return the same st_dev for every devfs instance. The reason
2456072eea0SDmitry Chagin * for this is to work around an idiosyncrasy of glibc getttynam()
2466072eea0SDmitry Chagin * implementation: it checks whether st_dev returned for fd 0
2476072eea0SDmitry Chagin * is the same as st_dev returned for the target of /proc/self/fd/0
2486072eea0SDmitry Chagin * symlink, and with linux chroots having their own devfs instance,
2496072eea0SDmitry Chagin * the check will fail if you chroot into it.
2506072eea0SDmitry Chagin */
2516072eea0SDmitry Chagin if (rootdevmp != NULL && vp->v_mount->mnt_vfc == rootdevmp->mnt_vfc)
2526072eea0SDmitry Chagin sb->st_dev = rootdevmp->mnt_stat.f_fsid.val[0];
2536072eea0SDmitry Chagin
2546072eea0SDmitry Chagin if (linux_vn_get_major_minor(vp, &major, &minor) == 0)
255166e2e5aSDmitry Chagin sb->st_rdev = makedev(major, minor);
2566072eea0SDmitry Chagin }
2576072eea0SDmitry Chagin
258060e4882SDoug Ambrisko char *
linux_get_char_devices(void)259e90d1b57SDimitry Andric linux_get_char_devices(void)
260060e4882SDoug Ambrisko {
261060e4882SDoug Ambrisko struct device_element *de;
262060e4882SDoug Ambrisko char *temp, *string, *last;
263060e4882SDoug Ambrisko char formated[256];
264060e4882SDoug Ambrisko int current_size = 0, string_size = 1024;
265060e4882SDoug Ambrisko
2661ede983cSDag-Erling Smørgrav string = malloc(string_size, M_LINUX, M_WAITOK);
267060e4882SDoug Ambrisko string[0] = '\000';
268060e4882SDoug Ambrisko last = "";
269060e4882SDoug Ambrisko TAILQ_FOREACH(de, &devices, list) {
270060e4882SDoug Ambrisko if (!de->entry.linux_char_device)
271060e4882SDoug Ambrisko continue;
272060e4882SDoug Ambrisko temp = string;
273060e4882SDoug Ambrisko if (strcmp(last, de->entry.bsd_driver_name) != 0) {
274060e4882SDoug Ambrisko last = de->entry.bsd_driver_name;
275060e4882SDoug Ambrisko
276060e4882SDoug Ambrisko snprintf(formated, sizeof(formated), "%3d %s\n",
277060e4882SDoug Ambrisko de->entry.linux_major,
278060e4882SDoug Ambrisko de->entry.linux_device_name);
279060e4882SDoug Ambrisko if (strlen(formated) + current_size
280060e4882SDoug Ambrisko >= string_size) {
281060e4882SDoug Ambrisko string_size *= 2;
2821ede983cSDag-Erling Smørgrav string = malloc(string_size,
283060e4882SDoug Ambrisko M_LINUX, M_WAITOK);
284060e4882SDoug Ambrisko bcopy(temp, string, current_size);
2851ede983cSDag-Erling Smørgrav free(temp, M_LINUX);
286060e4882SDoug Ambrisko }
287060e4882SDoug Ambrisko strcat(string, formated);
288060e4882SDoug Ambrisko current_size = strlen(string);
289060e4882SDoug Ambrisko }
290060e4882SDoug Ambrisko }
291060e4882SDoug Ambrisko
29267d39748SDmitry Chagin return (string);
293060e4882SDoug Ambrisko }
294060e4882SDoug Ambrisko
295060e4882SDoug Ambrisko void
linux_free_get_char_devices(char * string)296060e4882SDoug Ambrisko linux_free_get_char_devices(char *string)
297060e4882SDoug Ambrisko {
29819e252baSAlexander Leidinger
2991ede983cSDag-Erling Smørgrav free(string, M_LINUX);
300060e4882SDoug Ambrisko }
301060e4882SDoug Ambrisko
302060e4882SDoug Ambrisko static int linux_major_starting = 200;
303060e4882SDoug Ambrisko
304060e4882SDoug Ambrisko int
linux_device_register_handler(struct linux_device_handler * d)305060e4882SDoug Ambrisko linux_device_register_handler(struct linux_device_handler *d)
306060e4882SDoug Ambrisko {
307060e4882SDoug Ambrisko struct device_element *de;
308060e4882SDoug Ambrisko
30967d39748SDmitry Chagin if (d == NULL)
31019e252baSAlexander Leidinger return (EINVAL);
31119e252baSAlexander Leidinger
31219e252baSAlexander Leidinger de = malloc(sizeof(*de), M_LINUX, M_WAITOK);
313060e4882SDoug Ambrisko if (d->linux_major < 0) {
314060e4882SDoug Ambrisko d->linux_major = linux_major_starting++;
315060e4882SDoug Ambrisko }
316060e4882SDoug Ambrisko bcopy(d, &de->entry, sizeof(*d));
317060e4882SDoug Ambrisko
318060e4882SDoug Ambrisko /* Add the element to the list, sorted on span. */
319060e4882SDoug Ambrisko TAILQ_INSERT_TAIL(&devices, de, list);
320060e4882SDoug Ambrisko
321060e4882SDoug Ambrisko return (0);
322060e4882SDoug Ambrisko }
323060e4882SDoug Ambrisko
324060e4882SDoug Ambrisko int
linux_device_unregister_handler(struct linux_device_handler * d)325060e4882SDoug Ambrisko linux_device_unregister_handler(struct linux_device_handler *d)
326060e4882SDoug Ambrisko {
327060e4882SDoug Ambrisko struct device_element *de;
328060e4882SDoug Ambrisko
32967d39748SDmitry Chagin if (d == NULL)
330060e4882SDoug Ambrisko return (EINVAL);
331060e4882SDoug Ambrisko
332060e4882SDoug Ambrisko TAILQ_FOREACH(de, &devices, list) {
333060e4882SDoug Ambrisko if (bcmp(d, &de->entry, sizeof(*d)) == 0) {
334060e4882SDoug Ambrisko TAILQ_REMOVE(&devices, de, list);
3351ede983cSDag-Erling Smørgrav free(de, M_LINUX);
33619e252baSAlexander Leidinger
337060e4882SDoug Ambrisko return (0);
338060e4882SDoug Ambrisko }
339060e4882SDoug Ambrisko }
340060e4882SDoug Ambrisko
341060e4882SDoug Ambrisko return (EINVAL);
342060e4882SDoug Ambrisko }
343