svr4_sysvec.c revision 72999 
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 * $FreeBSD: head/sys/compat/svr4/svr4_sysvec.c 72999 2001-02-24 22:20:11Z obrien $
31 */
32
33/* XXX we use functions that might not exist. */
34#include "opt_compat.h"
35
36#ifndef COMPAT_43
37#error "Unable to compile SVR4-emulator due to missing COMPAT_43 option!"
38#endif
39
40#include <sys/param.h>
41#include <sys/systm.h>
42#include <sys/proc.h>
43#include <sys/sysent.h>
44#include <sys/imgact.h>
45#include <sys/imgact_elf.h>
46#include <sys/socket.h>
47#include <sys/malloc.h>
48#include <sys/namei.h>
49#include <sys/vnode.h>
50#include <sys/module.h>
51#include <vm/vm.h>
52#include <sys/exec.h>
53#include <sys/kernel.h>
54#include <machine/cpu.h>
55#include <netinet/in.h>
56
57#include <compat/svr4/svr4.h>
58#include <compat/svr4/svr4_types.h>
59#include <compat/svr4/svr4_syscall.h>
60#include <compat/svr4/svr4_signal.h>
61#include <compat/svr4/svr4_sockio.h>
62#include <compat/svr4/svr4_socket.h>
63#include <compat/svr4/svr4_errno.h>
64#include <compat/svr4/svr4_proto.h>
65#include <compat/svr4/svr4_siginfo.h>
66#include <compat/svr4/svr4_util.h>
67
68int bsd_to_svr4_errno[ELAST+1] = {
69        0,
70        SVR4_EPERM,
71        SVR4_ENOENT,
72        SVR4_ESRCH,
73        SVR4_EINTR,
74        SVR4_EIO,
75        SVR4_ENXIO,
76        SVR4_E2BIG,
77        SVR4_ENOEXEC,
78        SVR4_EBADF,
79        SVR4_ECHILD,
80        SVR4_EDEADLK,
81        SVR4_ENOMEM,
82        SVR4_EACCES,
83        SVR4_EFAULT,
84        SVR4_ENOTBLK,
85        SVR4_EBUSY,
86        SVR4_EEXIST,
87        SVR4_EXDEV,
88        SVR4_ENODEV,
89        SVR4_ENOTDIR,
90        SVR4_EISDIR,
91        SVR4_EINVAL,
92        SVR4_ENFILE,
93        SVR4_EMFILE,
94        SVR4_ENOTTY,
95        SVR4_ETXTBSY,
96        SVR4_EFBIG,
97        SVR4_ENOSPC,
98        SVR4_ESPIPE,
99        SVR4_EROFS,
100        SVR4_EMLINK,
101        SVR4_EPIPE,
102        SVR4_EDOM,
103        SVR4_ERANGE,
104        SVR4_EAGAIN,
105        SVR4_EINPROGRESS,
106        SVR4_EALREADY,
107        SVR4_ENOTSOCK,
108        SVR4_EDESTADDRREQ,
109        SVR4_EMSGSIZE,
110        SVR4_EPROTOTYPE,
111        SVR4_ENOPROTOOPT,
112        SVR4_EPROTONOSUPPORT,
113        SVR4_ESOCKTNOSUPPORT,
114        SVR4_EOPNOTSUPP,
115        SVR4_EPFNOSUPPORT,
116        SVR4_EAFNOSUPPORT,
117        SVR4_EADDRINUSE,
118        SVR4_EADDRNOTAVAIL,
119        SVR4_ENETDOWN,
120        SVR4_ENETUNREACH,
121        SVR4_ENETRESET,
122        SVR4_ECONNABORTED,
123        SVR4_ECONNRESET,
124        SVR4_ENOBUFS,
125        SVR4_EISCONN,
126        SVR4_ENOTCONN,
127        SVR4_ESHUTDOWN,
128        SVR4_ETOOMANYREFS,
129        SVR4_ETIMEDOUT,
130        SVR4_ECONNREFUSED,
131        SVR4_ELOOP,
132        SVR4_ENAMETOOLONG,
133        SVR4_EHOSTDOWN,
134        SVR4_EHOSTUNREACH,
135        SVR4_ENOTEMPTY,
136        SVR4_EPROCLIM,
137        SVR4_EUSERS,
138        SVR4_EDQUOT,
139        SVR4_ESTALE,
140        SVR4_EREMOTE,
141        SVR4_EBADRPC,
142        SVR4_ERPCMISMATCH,
143        SVR4_EPROGUNAVAIL,
144        SVR4_EPROGMISMATCH,
145        SVR4_EPROCUNAVAIL,
146        SVR4_ENOLCK,
147        SVR4_ENOSYS,
148        SVR4_EFTYPE,
149        SVR4_EAUTH,
150        SVR4_ENEEDAUTH,
151        SVR4_EIDRM,
152        SVR4_ENOMSG,
153};
154
155
156static int 	svr4_fixup(register_t **stack_base, struct image_params *imgp);
157
158extern struct sysent svr4_sysent[];
159#undef szsigcode
160#undef sigcode
161
162extern int svr4_szsigcode;
163extern char svr4_sigcode[];
164
165struct sysentvec svr4_sysvec = {
166  SVR4_SYS_MAXSYSCALL,
167  svr4_sysent,
168  0xff,
169  SVR4_SIGTBLSZ,
170  bsd_to_svr4_sig,
171  ELAST,  /* ELAST */
172  bsd_to_svr4_errno,
173  0,
174  svr4_fixup,
175  svr4_sendsig,
176  svr4_sigcode,
177  &svr4_szsigcode,
178  NULL,
179  "SVR4",
180  elf_coredump,
181  NULL,
182  SVR4_MINSIGSTKSZ
183};
184
185Elf32_Brandinfo svr4_brand = {
186  ELFOSABI_SOLARIS,		/* XXX  Or should we use ELFOSABI_SYSV here?  */
187  "SVR4",
188  svr4_emul_path,
189  "/lib/libc.so.1",
190  &svr4_sysvec
191};
192
193const char      svr4_emul_path[] = "/compat/svr4";
194
195static int
196svr4_fixup(register_t **stack_base, struct image_params *imgp)
197{
198	Elf32_Auxargs *args = (Elf32_Auxargs *)imgp->auxargs;
199	register_t *pos;
200
201	pos = *stack_base + (imgp->argc + imgp->envc + 2);
202
203	if (args->trace) {
204		AUXARGS_ENTRY(pos, AT_DEBUG, 1);
205	}
206	if (args->execfd != -1) {
207		AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
208	}
209	AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
210	AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
211	AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
212	AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
213	AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
214	AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
215	AUXARGS_ENTRY(pos, AT_BASE, args->base);
216	AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_cred->p_ruid);
217	AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_cred->p_svuid);
218	AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_cred->p_rgid);
219	AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_cred->p_svgid);
220	AUXARGS_ENTRY(pos, AT_NULL, 0);
221
222	free(imgp->auxargs, M_TEMP);
223	imgp->auxargs = NULL;
224
225	(*stack_base)--;
226	**stack_base = (int)imgp->argc;
227	return 0;
228}
229
230/*
231 * Search an alternate path before passing pathname arguments on
232 * to system calls. Useful for keeping a separate 'emulation tree'.
233 *
234 * If cflag is set, we check if an attempt can be made to create
235 * the named file, i.e. we check if the directory it should
236 * be in exists.
237 *
238 * Code shamelessly stolen by Mark Newton from IBCS2 emulation code.
239 */
240int
241svr4_emul_find(p, sgp, prefix, path, pbuf, cflag)
242	struct proc	 *p;
243	caddr_t		 *sgp;		/* Pointer to stackgap memory */
244	const char	 *prefix;
245	char		 *path;
246	char		**pbuf;
247	int		  cflag;
248{
249	struct nameidata	 nd;
250	struct nameidata	 ndroot;
251	struct vattr		 vat;
252	struct vattr		 vatroot;
253	int			 error;
254	char			*ptr, *buf, *cp;
255	size_t			 sz, len;
256
257	buf = (char *) malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
258	*pbuf = path;
259
260	for (ptr = buf; (*ptr = *prefix) != '\0'; ptr++, prefix++)
261		continue;
262
263	sz = MAXPATHLEN - (ptr - buf);
264
265	/*
266	 * If sgp is not given then the path is already in kernel space
267	 */
268	if (sgp == NULL)
269		error = copystr(path, ptr, sz, &len);
270	else
271		error = copyinstr(path, ptr, sz, &len);
272
273	if (error) {
274		free(buf, M_TEMP);
275		return error;
276	}
277
278	if (*ptr != '/') {
279		free(buf, M_TEMP);
280		return EINVAL;
281	}
282
283	/*
284	 * We know that there is a / somewhere in this pathname.
285	 * Search backwards for it, to find the file's parent dir
286	 * to see if it exists in the alternate tree. If it does,
287	 * and we want to create a file (cflag is set). We don't
288	 * need to worry about the root comparison in this case.
289	 */
290
291	if (cflag) {
292		for (cp = &ptr[len] - 1; *cp != '/'; cp--);
293		*cp = '\0';
294
295		NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, p);
296
297		if ((error = namei(&nd)) != 0) {
298			free(buf, M_TEMP);
299			return error;
300		}
301		NDFREE(&nd, NDF_ONLY_PNBUF);
302
303		*cp = '/';
304	}
305	else {
306		NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, p);
307
308		if ((error = namei(&nd)) != 0) {
309			free(buf, M_TEMP);
310			return error;
311		}
312		NDFREE(&nd, NDF_ONLY_PNBUF);
313
314		/*
315		 * We now compare the vnode of the svr4_root to the one
316		 * vnode asked. If they resolve to be the same, then we
317		 * ignore the match so that the real root gets used.
318		 * This avoids the problem of traversing "../.." to find the
319		 * root directory and never finding it, because "/" resolves
320		 * to the emulation root directory. This is expensive :-(
321		 */
322		NDINIT(&ndroot, LOOKUP, FOLLOW, UIO_SYSSPACE, svr4_emul_path,
323		       p);
324
325		if ((error = namei(&ndroot)) != 0) {
326			/* Cannot happen! */
327			free(buf, M_TEMP);
328			vrele(nd.ni_vp);
329			return error;
330		}
331		NDFREE(&ndroot, NDF_ONLY_PNBUF);
332
333		if ((error = VOP_GETATTR(nd.ni_vp, &vat, p->p_ucred, p)) != 0) {
334			goto done;
335		}
336
337		if ((error = VOP_GETATTR(ndroot.ni_vp, &vatroot, p->p_ucred, p))
338		    != 0) {
339			goto done;
340		}
341
342		if (vat.va_fsid == vatroot.va_fsid &&
343		    vat.va_fileid == vatroot.va_fileid) {
344			error = ENOENT;
345			goto done;
346		}
347
348	}
349	if (sgp == NULL)
350		*pbuf = buf;
351	else {
352		sz = &ptr[len] - buf;
353		*pbuf = stackgap_alloc(sgp, sz + 1);
354		error = copyout(buf, *pbuf, sz);
355		free(buf, M_TEMP);
356	}
357
358
359done:
360	vrele(nd.ni_vp);
361	if (!cflag)
362		vrele(ndroot.ni_vp);
363	return error;
364}
365
366static int
367svr4_elf_modevent(module_t mod, int type, void *data)
368{
369	int error;
370
371	error = 0;
372
373	switch(type) {
374	case MOD_LOAD:
375		if (elf_insert_brand_entry(&svr4_brand) < 0)
376			error = EINVAL;
377		if (error)
378			printf("cannot insert svr4 elf brand handler\n");
379		else if (bootverbose)
380			printf("svr4 ELF exec handler installed\n");
381		break;
382	case MOD_UNLOAD:
383		/* Only allow the emulator to be removed if it isn't in use. */
384		if (elf_brand_inuse(&svr4_brand) != 0) {
385			error = EBUSY;
386		} else if (elf_remove_brand_entry(&svr4_brand) < 0) {
387			error = EINVAL;
388		}
389
390		if (error)
391			printf("Could not deinstall ELF interpreter entry (error %d)\n",
392			       error);
393		else if (bootverbose)
394			printf("svr4 ELF exec handler removed\n");
395		break;
396	default:
397		break;
398	}
399	return error;
400}
401
402static moduledata_t svr4_elf_mod = {
403	"svr4elf",
404	svr4_elf_modevent,
405	0
406};
407DECLARE_MODULE(svr4elf, svr4_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
408MODULE_DEPEND(svr4elf, streams, 1, 1, 1);
409