1/*
2 * Copyright (c) 1998 Mark Newton
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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Christos Zoulas.
16 * 4. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <sys/cdefs.h>
| 1/*
2 * Copyright (c) 1998 Mark Newton
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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Christos Zoulas.
16 * 4. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <sys/cdefs.h>
|
32__FBSDID("$FreeBSD: head/sys/compat/svr4/svr4_sysvec.c 121275 2003-10-20 10:38:48Z tjr $");
| 32__FBSDID("$FreeBSD: head/sys/compat/svr4/svr4_sysvec.c 123742 2003-12-23 02:42:39Z peter $");
|
33
34/* XXX we use functions that might not exist. */
35#include "opt_compat.h"
36
37#ifndef COMPAT_43
38#error "Unable to compile SVR4-emulator due to missing COMPAT_43 option!"
39#endif
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/proc.h>
44#include <sys/sysent.h>
45#include <sys/imgact.h>
46#include <sys/imgact_elf.h>
47#include <sys/socket.h>
48#include <sys/lock.h>
49#include <sys/malloc.h>
50#include <sys/mutex.h>
51#include <sys/namei.h>
52#include <sys/vnode.h>
53#include <sys/module.h>
54#include <vm/vm.h>
55#include <sys/exec.h>
56#include <sys/kernel.h>
57#include <machine/cpu.h>
58#include <netinet/in.h>
59
60#include <compat/svr4/svr4.h>
61#include <compat/svr4/svr4_types.h>
62#include <compat/svr4/svr4_syscall.h>
63#include <compat/svr4/svr4_signal.h>
64#include <compat/svr4/svr4_sockio.h>
65#include <compat/svr4/svr4_errno.h>
66#include <compat/svr4/svr4_proto.h>
67#include <compat/svr4/svr4_siginfo.h>
68#include <compat/svr4/svr4_util.h>
69
70int bsd_to_svr4_errno[ELAST+1] = {
71 0,
72 SVR4_EPERM,
73 SVR4_ENOENT,
74 SVR4_ESRCH,
75 SVR4_EINTR,
76 SVR4_EIO,
77 SVR4_ENXIO,
78 SVR4_E2BIG,
79 SVR4_ENOEXEC,
80 SVR4_EBADF,
81 SVR4_ECHILD,
82 SVR4_EDEADLK,
83 SVR4_ENOMEM,
84 SVR4_EACCES,
85 SVR4_EFAULT,
86 SVR4_ENOTBLK,
87 SVR4_EBUSY,
88 SVR4_EEXIST,
89 SVR4_EXDEV,
90 SVR4_ENODEV,
91 SVR4_ENOTDIR,
92 SVR4_EISDIR,
93 SVR4_EINVAL,
94 SVR4_ENFILE,
95 SVR4_EMFILE,
96 SVR4_ENOTTY,
97 SVR4_ETXTBSY,
98 SVR4_EFBIG,
99 SVR4_ENOSPC,
100 SVR4_ESPIPE,
101 SVR4_EROFS,
102 SVR4_EMLINK,
103 SVR4_EPIPE,
104 SVR4_EDOM,
105 SVR4_ERANGE,
106 SVR4_EAGAIN,
107 SVR4_EINPROGRESS,
108 SVR4_EALREADY,
109 SVR4_ENOTSOCK,
110 SVR4_EDESTADDRREQ,
111 SVR4_EMSGSIZE,
112 SVR4_EPROTOTYPE,
113 SVR4_ENOPROTOOPT,
114 SVR4_EPROTONOSUPPORT,
115 SVR4_ESOCKTNOSUPPORT,
116 SVR4_EOPNOTSUPP,
117 SVR4_EPFNOSUPPORT,
118 SVR4_EAFNOSUPPORT,
119 SVR4_EADDRINUSE,
120 SVR4_EADDRNOTAVAIL,
121 SVR4_ENETDOWN,
122 SVR4_ENETUNREACH,
123 SVR4_ENETRESET,
124 SVR4_ECONNABORTED,
125 SVR4_ECONNRESET,
126 SVR4_ENOBUFS,
127 SVR4_EISCONN,
128 SVR4_ENOTCONN,
129 SVR4_ESHUTDOWN,
130 SVR4_ETOOMANYREFS,
131 SVR4_ETIMEDOUT,
132 SVR4_ECONNREFUSED,
133 SVR4_ELOOP,
134 SVR4_ENAMETOOLONG,
135 SVR4_EHOSTDOWN,
136 SVR4_EHOSTUNREACH,
137 SVR4_ENOTEMPTY,
138 SVR4_EPROCLIM,
139 SVR4_EUSERS,
140 SVR4_EDQUOT,
141 SVR4_ESTALE,
142 SVR4_EREMOTE,
143 SVR4_EBADRPC,
144 SVR4_ERPCMISMATCH,
145 SVR4_EPROGUNAVAIL,
146 SVR4_EPROGMISMATCH,
147 SVR4_EPROCUNAVAIL,
148 SVR4_ENOLCK,
149 SVR4_ENOSYS,
150 SVR4_EFTYPE,
151 SVR4_EAUTH,
152 SVR4_ENEEDAUTH,
153 SVR4_EIDRM,
154 SVR4_ENOMSG,
155};
156
157
158static int svr4_fixup(register_t **stack_base, struct image_params *imgp);
159
160extern struct sysent svr4_sysent[];
161#undef szsigcode
162#undef sigcode
163
164extern int svr4_szsigcode;
165extern char svr4_sigcode[];
166
167struct sysentvec svr4_sysvec = {
168 SVR4_SYS_MAXSYSCALL,
169 svr4_sysent,
170 0xff,
171 SVR4_SIGTBLSZ,
172 bsd_to_svr4_sig,
173 ELAST, /* ELAST */
174 bsd_to_svr4_errno,
175 NULL,
176 svr4_fixup,
177 svr4_sendsig,
178 svr4_sigcode,
179 &svr4_szsigcode,
180 NULL,
181 "SVR4",
182 elf32_coredump,
183 NULL,
184 SVR4_MINSIGSTKSZ,
185 PAGE_SIZE,
186 VM_MIN_ADDRESS,
187 VM_MAXUSER_ADDRESS,
188 USRSTACK,
189 PS_STRINGS,
190 VM_PROT_ALL,
191 exec_copyout_strings,
192 exec_setregs,
193 NULL
194};
195
196Elf32_Brandinfo svr4_brand = {
197 ELFOSABI_SYSV,
198 EM_386, /* XXX only implemented for x86 so far. */
199 "SVR4",
200 svr4_emul_path,
201 "/lib/libc.so.1",
| 33
34/* XXX we use functions that might not exist. */
35#include "opt_compat.h"
36
37#ifndef COMPAT_43
38#error "Unable to compile SVR4-emulator due to missing COMPAT_43 option!"
39#endif
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/proc.h>
44#include <sys/sysent.h>
45#include <sys/imgact.h>
46#include <sys/imgact_elf.h>
47#include <sys/socket.h>
48#include <sys/lock.h>
49#include <sys/malloc.h>
50#include <sys/mutex.h>
51#include <sys/namei.h>
52#include <sys/vnode.h>
53#include <sys/module.h>
54#include <vm/vm.h>
55#include <sys/exec.h>
56#include <sys/kernel.h>
57#include <machine/cpu.h>
58#include <netinet/in.h>
59
60#include <compat/svr4/svr4.h>
61#include <compat/svr4/svr4_types.h>
62#include <compat/svr4/svr4_syscall.h>
63#include <compat/svr4/svr4_signal.h>
64#include <compat/svr4/svr4_sockio.h>
65#include <compat/svr4/svr4_errno.h>
66#include <compat/svr4/svr4_proto.h>
67#include <compat/svr4/svr4_siginfo.h>
68#include <compat/svr4/svr4_util.h>
69
70int bsd_to_svr4_errno[ELAST+1] = {
71 0,
72 SVR4_EPERM,
73 SVR4_ENOENT,
74 SVR4_ESRCH,
75 SVR4_EINTR,
76 SVR4_EIO,
77 SVR4_ENXIO,
78 SVR4_E2BIG,
79 SVR4_ENOEXEC,
80 SVR4_EBADF,
81 SVR4_ECHILD,
82 SVR4_EDEADLK,
83 SVR4_ENOMEM,
84 SVR4_EACCES,
85 SVR4_EFAULT,
86 SVR4_ENOTBLK,
87 SVR4_EBUSY,
88 SVR4_EEXIST,
89 SVR4_EXDEV,
90 SVR4_ENODEV,
91 SVR4_ENOTDIR,
92 SVR4_EISDIR,
93 SVR4_EINVAL,
94 SVR4_ENFILE,
95 SVR4_EMFILE,
96 SVR4_ENOTTY,
97 SVR4_ETXTBSY,
98 SVR4_EFBIG,
99 SVR4_ENOSPC,
100 SVR4_ESPIPE,
101 SVR4_EROFS,
102 SVR4_EMLINK,
103 SVR4_EPIPE,
104 SVR4_EDOM,
105 SVR4_ERANGE,
106 SVR4_EAGAIN,
107 SVR4_EINPROGRESS,
108 SVR4_EALREADY,
109 SVR4_ENOTSOCK,
110 SVR4_EDESTADDRREQ,
111 SVR4_EMSGSIZE,
112 SVR4_EPROTOTYPE,
113 SVR4_ENOPROTOOPT,
114 SVR4_EPROTONOSUPPORT,
115 SVR4_ESOCKTNOSUPPORT,
116 SVR4_EOPNOTSUPP,
117 SVR4_EPFNOSUPPORT,
118 SVR4_EAFNOSUPPORT,
119 SVR4_EADDRINUSE,
120 SVR4_EADDRNOTAVAIL,
121 SVR4_ENETDOWN,
122 SVR4_ENETUNREACH,
123 SVR4_ENETRESET,
124 SVR4_ECONNABORTED,
125 SVR4_ECONNRESET,
126 SVR4_ENOBUFS,
127 SVR4_EISCONN,
128 SVR4_ENOTCONN,
129 SVR4_ESHUTDOWN,
130 SVR4_ETOOMANYREFS,
131 SVR4_ETIMEDOUT,
132 SVR4_ECONNREFUSED,
133 SVR4_ELOOP,
134 SVR4_ENAMETOOLONG,
135 SVR4_EHOSTDOWN,
136 SVR4_EHOSTUNREACH,
137 SVR4_ENOTEMPTY,
138 SVR4_EPROCLIM,
139 SVR4_EUSERS,
140 SVR4_EDQUOT,
141 SVR4_ESTALE,
142 SVR4_EREMOTE,
143 SVR4_EBADRPC,
144 SVR4_ERPCMISMATCH,
145 SVR4_EPROGUNAVAIL,
146 SVR4_EPROGMISMATCH,
147 SVR4_EPROCUNAVAIL,
148 SVR4_ENOLCK,
149 SVR4_ENOSYS,
150 SVR4_EFTYPE,
151 SVR4_EAUTH,
152 SVR4_ENEEDAUTH,
153 SVR4_EIDRM,
154 SVR4_ENOMSG,
155};
156
157
158static int svr4_fixup(register_t **stack_base, struct image_params *imgp);
159
160extern struct sysent svr4_sysent[];
161#undef szsigcode
162#undef sigcode
163
164extern int svr4_szsigcode;
165extern char svr4_sigcode[];
166
167struct sysentvec svr4_sysvec = {
168 SVR4_SYS_MAXSYSCALL,
169 svr4_sysent,
170 0xff,
171 SVR4_SIGTBLSZ,
172 bsd_to_svr4_sig,
173 ELAST, /* ELAST */
174 bsd_to_svr4_errno,
175 NULL,
176 svr4_fixup,
177 svr4_sendsig,
178 svr4_sigcode,
179 &svr4_szsigcode,
180 NULL,
181 "SVR4",
182 elf32_coredump,
183 NULL,
184 SVR4_MINSIGSTKSZ,
185 PAGE_SIZE,
186 VM_MIN_ADDRESS,
187 VM_MAXUSER_ADDRESS,
188 USRSTACK,
189 PS_STRINGS,
190 VM_PROT_ALL,
191 exec_copyout_strings,
192 exec_setregs,
193 NULL
194};
195
196Elf32_Brandinfo svr4_brand = {
197 ELFOSABI_SYSV,
198 EM_386, /* XXX only implemented for x86 so far. */
199 "SVR4",
200 svr4_emul_path,
201 "/lib/libc.so.1",
|
202 &svr4_sysvec
| 202 &svr4_sysvec,
203 NULL,
|
203};
204
205const char svr4_emul_path[] = "/compat/svr4";
206
207static int
208svr4_fixup(register_t **stack_base, struct image_params *imgp)
209{
210 Elf32_Auxargs *args;
211 register_t *pos;
212
213 KASSERT(curthread->td_proc == imgp->proc &&
214 (curthread->td_proc->p_flag & P_SA) == 0,
215 ("unsafe svr4_fixup(), should be curproc"));
216 args = (Elf32_Auxargs *)imgp->auxargs;
217 pos = *stack_base + (imgp->argc + imgp->envc + 2);
218
219 if (args->trace)
220 AUXARGS_ENTRY(pos, AT_DEBUG, 1);
221 if (args->execfd != -1)
222 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
223 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
224 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
225 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
226 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
227 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
228 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
229 AUXARGS_ENTRY(pos, AT_BASE, args->base);
230 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
231 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
232 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
233 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
234 AUXARGS_ENTRY(pos, AT_NULL, 0);
235
236 free(imgp->auxargs, M_TEMP);
237 imgp->auxargs = NULL;
238
239 (*stack_base)--;
240 **stack_base = (register_t)imgp->argc;
241 return 0;
242}
243
244/*
245 * Search an alternate path before passing pathname arguments on
246 * to system calls. Useful for keeping a separate 'emulation tree'.
247 *
248 * If cflag is set, we check if an attempt can be made to create
249 * the named file, i.e. we check if the directory it should
250 * be in exists.
251 *
252 * Code shamelessly stolen by Mark Newton from IBCS2 emulation code.
253 */
254int
255svr4_emul_find(td, sgp, prefix, path, pbuf, cflag)
256 struct thread *td;
257 caddr_t *sgp; /* Pointer to stackgap memory */
258 const char *prefix;
259 char *path;
260 char **pbuf;
261 int cflag;
262{
263 struct nameidata nd;
264 struct nameidata ndroot;
265 struct vattr vat;
266 struct vattr vatroot;
267 int error;
268 char *ptr, *buf, *cp;
269 size_t sz, len;
270
271 buf = (char *) malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
272 *pbuf = path;
273
274 for (ptr = buf; (*ptr = *prefix) != '\0'; ptr++, prefix++)
275 continue;
276
277 sz = MAXPATHLEN - (ptr - buf);
278
279 /*
280 * If sgp is not given then the path is already in kernel space
281 */
282 if (sgp == NULL)
283 error = copystr(path, ptr, sz, &len);
284 else
285 error = copyinstr(path, ptr, sz, &len);
286
287 if (error) {
288 free(buf, M_TEMP);
289 return error;
290 }
291
292 if (*ptr != '/') {
293 free(buf, M_TEMP);
294 return EINVAL;
295 }
296
297 /*
298 * We know that there is a / somewhere in this pathname.
299 * Search backwards for it, to find the file's parent dir
300 * to see if it exists in the alternate tree. If it does,
301 * and we want to create a file (cflag is set). We don't
302 * need to worry about the root comparison in this case.
303 */
304
305 if (cflag) {
306 for (cp = &ptr[len] - 1; *cp != '/'; cp--);
307 *cp = '\0';
308
309 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, td);
310
311 if ((error = namei(&nd)) != 0) {
312 free(buf, M_TEMP);
313 return error;
314 }
315 NDFREE(&nd, NDF_ONLY_PNBUF);
316
317 *cp = '/';
318 }
319 else {
320 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, td);
321
322 if ((error = namei(&nd)) != 0) {
323 free(buf, M_TEMP);
324 return error;
325 }
326 NDFREE(&nd, NDF_ONLY_PNBUF);
327
328 /*
329 * We now compare the vnode of the svr4_root to the one
330 * vnode asked. If they resolve to be the same, then we
331 * ignore the match so that the real root gets used.
332 * This avoids the problem of traversing "../.." to find the
333 * root directory and never finding it, because "/" resolves
334 * to the emulation root directory. This is expensive :-(
335 */
336 NDINIT(&ndroot, LOOKUP, FOLLOW, UIO_SYSSPACE, svr4_emul_path,
337 td);
338
339 if ((error = namei(&ndroot)) != 0) {
340 /* Cannot happen! */
341 free(buf, M_TEMP);
342 vrele(nd.ni_vp);
343 return error;
344 }
345 NDFREE(&ndroot, NDF_ONLY_PNBUF);
346
347 if ((error = VOP_GETATTR(nd.ni_vp, &vat, td->td_ucred, td)) != 0) {
348 goto done;
349 }
350
351 if ((error = VOP_GETATTR(ndroot.ni_vp, &vatroot, td->td_ucred, td))
352 != 0) {
353 goto done;
354 }
355
356 if (vat.va_fsid == vatroot.va_fsid &&
357 vat.va_fileid == vatroot.va_fileid) {
358 error = ENOENT;
359 goto done;
360 }
361
362 }
363 if (sgp == NULL)
364 *pbuf = buf;
365 else {
366 sz = &ptr[len] - buf;
367 if ((*pbuf = stackgap_alloc(sgp, sz + 1)) != NULL)
368 error = copyout(buf, *pbuf, sz);
369 else
370 error = ENAMETOOLONG;
371 free(buf, M_TEMP);
372 }
373
374
375done:
376 vrele(nd.ni_vp);
377 if (!cflag)
378 vrele(ndroot.ni_vp);
379 return error;
380}
381
382static int
383svr4_elf_modevent(module_t mod, int type, void *data)
384{
385 int error;
386
387 error = 0;
388
389 switch(type) {
390 case MOD_LOAD:
391 if (elf32_insert_brand_entry(&svr4_brand) < 0)
392 error = EINVAL;
393 if (error)
394 printf("cannot insert svr4 elf brand handler\n");
395 else if (bootverbose)
396 printf("svr4 ELF exec handler installed\n");
397 break;
398 case MOD_UNLOAD:
399 /* Only allow the emulator to be removed if it isn't in use. */
400 if (elf32_brand_inuse(&svr4_brand) != 0) {
401 error = EBUSY;
402 } else if (elf32_remove_brand_entry(&svr4_brand) < 0) {
403 error = EINVAL;
404 }
405
406 if (error)
407 printf("Could not deinstall ELF interpreter entry (error %d)\n",
408 error);
409 else if (bootverbose)
410 printf("svr4 ELF exec handler removed\n");
411 break;
412 default:
413 break;
414 }
415 return error;
416}
417
418static moduledata_t svr4_elf_mod = {
419 "svr4elf",
420 svr4_elf_modevent,
421 0
422};
423DECLARE_MODULE(svr4elf, svr4_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
424MODULE_DEPEND(svr4elf, streams, 1, 1, 1);
| 204};
205
206const char svr4_emul_path[] = "/compat/svr4";
207
208static int
209svr4_fixup(register_t **stack_base, struct image_params *imgp)
210{
211 Elf32_Auxargs *args;
212 register_t *pos;
213
214 KASSERT(curthread->td_proc == imgp->proc &&
215 (curthread->td_proc->p_flag & P_SA) == 0,
216 ("unsafe svr4_fixup(), should be curproc"));
217 args = (Elf32_Auxargs *)imgp->auxargs;
218 pos = *stack_base + (imgp->argc + imgp->envc + 2);
219
220 if (args->trace)
221 AUXARGS_ENTRY(pos, AT_DEBUG, 1);
222 if (args->execfd != -1)
223 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
224 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
225 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
226 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
227 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
228 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
229 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
230 AUXARGS_ENTRY(pos, AT_BASE, args->base);
231 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
232 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
233 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
234 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
235 AUXARGS_ENTRY(pos, AT_NULL, 0);
236
237 free(imgp->auxargs, M_TEMP);
238 imgp->auxargs = NULL;
239
240 (*stack_base)--;
241 **stack_base = (register_t)imgp->argc;
242 return 0;
243}
244
245/*
246 * Search an alternate path before passing pathname arguments on
247 * to system calls. Useful for keeping a separate 'emulation tree'.
248 *
249 * If cflag is set, we check if an attempt can be made to create
250 * the named file, i.e. we check if the directory it should
251 * be in exists.
252 *
253 * Code shamelessly stolen by Mark Newton from IBCS2 emulation code.
254 */
255int
256svr4_emul_find(td, sgp, prefix, path, pbuf, cflag)
257 struct thread *td;
258 caddr_t *sgp; /* Pointer to stackgap memory */
259 const char *prefix;
260 char *path;
261 char **pbuf;
262 int cflag;
263{
264 struct nameidata nd;
265 struct nameidata ndroot;
266 struct vattr vat;
267 struct vattr vatroot;
268 int error;
269 char *ptr, *buf, *cp;
270 size_t sz, len;
271
272 buf = (char *) malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
273 *pbuf = path;
274
275 for (ptr = buf; (*ptr = *prefix) != '\0'; ptr++, prefix++)
276 continue;
277
278 sz = MAXPATHLEN - (ptr - buf);
279
280 /*
281 * If sgp is not given then the path is already in kernel space
282 */
283 if (sgp == NULL)
284 error = copystr(path, ptr, sz, &len);
285 else
286 error = copyinstr(path, ptr, sz, &len);
287
288 if (error) {
289 free(buf, M_TEMP);
290 return error;
291 }
292
293 if (*ptr != '/') {
294 free(buf, M_TEMP);
295 return EINVAL;
296 }
297
298 /*
299 * We know that there is a / somewhere in this pathname.
300 * Search backwards for it, to find the file's parent dir
301 * to see if it exists in the alternate tree. If it does,
302 * and we want to create a file (cflag is set). We don't
303 * need to worry about the root comparison in this case.
304 */
305
306 if (cflag) {
307 for (cp = &ptr[len] - 1; *cp != '/'; cp--);
308 *cp = '\0';
309
310 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, td);
311
312 if ((error = namei(&nd)) != 0) {
313 free(buf, M_TEMP);
314 return error;
315 }
316 NDFREE(&nd, NDF_ONLY_PNBUF);
317
318 *cp = '/';
319 }
320 else {
321 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, td);
322
323 if ((error = namei(&nd)) != 0) {
324 free(buf, M_TEMP);
325 return error;
326 }
327 NDFREE(&nd, NDF_ONLY_PNBUF);
328
329 /*
330 * We now compare the vnode of the svr4_root to the one
331 * vnode asked. If they resolve to be the same, then we
332 * ignore the match so that the real root gets used.
333 * This avoids the problem of traversing "../.." to find the
334 * root directory and never finding it, because "/" resolves
335 * to the emulation root directory. This is expensive :-(
336 */
337 NDINIT(&ndroot, LOOKUP, FOLLOW, UIO_SYSSPACE, svr4_emul_path,
338 td);
339
340 if ((error = namei(&ndroot)) != 0) {
341 /* Cannot happen! */
342 free(buf, M_TEMP);
343 vrele(nd.ni_vp);
344 return error;
345 }
346 NDFREE(&ndroot, NDF_ONLY_PNBUF);
347
348 if ((error = VOP_GETATTR(nd.ni_vp, &vat, td->td_ucred, td)) != 0) {
349 goto done;
350 }
351
352 if ((error = VOP_GETATTR(ndroot.ni_vp, &vatroot, td->td_ucred, td))
353 != 0) {
354 goto done;
355 }
356
357 if (vat.va_fsid == vatroot.va_fsid &&
358 vat.va_fileid == vatroot.va_fileid) {
359 error = ENOENT;
360 goto done;
361 }
362
363 }
364 if (sgp == NULL)
365 *pbuf = buf;
366 else {
367 sz = &ptr[len] - buf;
368 if ((*pbuf = stackgap_alloc(sgp, sz + 1)) != NULL)
369 error = copyout(buf, *pbuf, sz);
370 else
371 error = ENAMETOOLONG;
372 free(buf, M_TEMP);
373 }
374
375
376done:
377 vrele(nd.ni_vp);
378 if (!cflag)
379 vrele(ndroot.ni_vp);
380 return error;
381}
382
383static int
384svr4_elf_modevent(module_t mod, int type, void *data)
385{
386 int error;
387
388 error = 0;
389
390 switch(type) {
391 case MOD_LOAD:
392 if (elf32_insert_brand_entry(&svr4_brand) < 0)
393 error = EINVAL;
394 if (error)
395 printf("cannot insert svr4 elf brand handler\n");
396 else if (bootverbose)
397 printf("svr4 ELF exec handler installed\n");
398 break;
399 case MOD_UNLOAD:
400 /* Only allow the emulator to be removed if it isn't in use. */
401 if (elf32_brand_inuse(&svr4_brand) != 0) {
402 error = EBUSY;
403 } else if (elf32_remove_brand_entry(&svr4_brand) < 0) {
404 error = EINVAL;
405 }
406
407 if (error)
408 printf("Could not deinstall ELF interpreter entry (error %d)\n",
409 error);
410 else if (bootverbose)
411 printf("svr4 ELF exec handler removed\n");
412 break;
413 default:
414 break;
415 }
416 return error;
417}
418
419static moduledata_t svr4_elf_mod = {
420 "svr4elf",
421 svr4_elf_modevent,
422 0
423};
424DECLARE_MODULE(svr4elf, svr4_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
425MODULE_DEPEND(svr4elf, streams, 1, 1, 1);
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