svr4_sysvec.c revision 49279 
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 * $Id: svr4_sysvec.c,v 1.4 1999/07/30 12:45:19 newton Exp $
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/buf.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/sockio.h>
49#include <sys/signalvar.h>
50#include <sys/malloc.h>
51#include <sys/namei.h>
52#include <sys/vnode.h>
53#include <sys/module.h>
54#include <vm/vm.h>
55#include <vm/vm_param.h>
56#include <vm/vm_prot.h>
57#include <vm/vm_page.h>
58#include <vm/vm_extern.h>
59#include <sys/exec.h>
60#include <sys/kernel.h>
61#include <machine/cpu.h>
62#include <netinet/in.h>
63
64#include <svr4/svr4.h>
65#include <svr4/svr4_types.h>
66#include <svr4/svr4_syscall.h>
67#include <svr4/svr4_signal.h>
68#include <svr4/svr4_sockio.h>
69#include <svr4/svr4_socket.h>
70#include <svr4/svr4_errno.h>
71#include <svr4/svr4_proto.h>
72#include <svr4/svr4_siginfo.h>
73#include <svr4/svr4_util.h>
74
75extern int bsd_to_svr4_sig[];
76extern int svr4_to_bsd_sig[];
77
78int bsd_to_svr4_errno[ELAST+1] = {
79        0,
80        SVR4_EPERM,
81        SVR4_ENOENT,
82        SVR4_ESRCH,
83        SVR4_EINTR,
84        SVR4_EIO,
85        SVR4_ENXIO,
86        SVR4_E2BIG,
87        SVR4_ENOEXEC,
88        SVR4_EBADF,
89        SVR4_ECHILD,
90        SVR4_EDEADLK,
91        SVR4_ENOMEM,
92        SVR4_EACCES,
93        SVR4_EFAULT,
94        SVR4_ENOTBLK,
95        SVR4_EBUSY,
96        SVR4_EEXIST,
97        SVR4_EXDEV,
98        SVR4_ENODEV,
99        SVR4_ENOTDIR,
100        SVR4_EISDIR,
101        SVR4_EINVAL,
102        SVR4_ENFILE,
103        SVR4_EMFILE,
104        SVR4_ENOTTY,
105        SVR4_ETXTBSY,
106        SVR4_EFBIG,
107        SVR4_ENOSPC,
108        SVR4_ESPIPE,
109        SVR4_EROFS,
110        SVR4_EMLINK,
111        SVR4_EPIPE,
112        SVR4_EDOM,
113        SVR4_ERANGE,
114        SVR4_EAGAIN,
115        SVR4_EINPROGRESS,
116        SVR4_EALREADY,
117        SVR4_ENOTSOCK,
118        SVR4_EDESTADDRREQ,
119        SVR4_EMSGSIZE,
120        SVR4_EPROTOTYPE,
121        SVR4_ENOPROTOOPT,
122        SVR4_EPROTONOSUPPORT,
123        SVR4_ESOCKTNOSUPPORT,
124        SVR4_EOPNOTSUPP,
125        SVR4_EPFNOSUPPORT,
126        SVR4_EAFNOSUPPORT,
127        SVR4_EADDRINUSE,
128        SVR4_EADDRNOTAVAIL,
129        SVR4_ENETDOWN,
130        SVR4_ENETUNREACH,
131        SVR4_ENETRESET,
132        SVR4_ECONNABORTED,
133        SVR4_ECONNRESET,
134        SVR4_ENOBUFS,
135        SVR4_EISCONN,
136        SVR4_ENOTCONN,
137        SVR4_ESHUTDOWN,
138        SVR4_ETOOMANYREFS,
139        SVR4_ETIMEDOUT,
140        SVR4_ECONNREFUSED,
141        SVR4_ELOOP,
142        SVR4_ENAMETOOLONG,
143        SVR4_EHOSTDOWN,
144        SVR4_EHOSTUNREACH,
145        SVR4_ENOTEMPTY,
146        SVR4_EPROCLIM,
147        SVR4_EUSERS,
148        SVR4_EDQUOT,
149        SVR4_ESTALE,
150        SVR4_EREMOTE,
151        SVR4_EBADRPC,
152        SVR4_ERPCMISMATCH,
153        SVR4_EPROGUNAVAIL,
154        SVR4_EPROGMISMATCH,
155        SVR4_EPROCUNAVAIL,
156        SVR4_ENOLCK,
157        SVR4_ENOSYS,
158        SVR4_EFTYPE,
159        SVR4_EAUTH,
160        SVR4_ENEEDAUTH,
161        SVR4_EIDRM,
162        SVR4_ENOMSG,
163};
164
165
166static int 	svr4_fixup(long **stack_base, struct image_params *imgp);
167
168extern struct sysent svr4_sysent[];
169#undef szsigcode
170#undef sigcode
171
172extern int svr4_szsigcode;
173extern char svr4_sigcode[];
174
175struct sysentvec svr4_sysvec = {
176  SVR4_SYS_MAXSYSCALL,
177  svr4_sysent,
178  0xff,
179  NSIG,
180  bsd_to_svr4_sig,
181  ELAST,  /* ELAST */
182  bsd_to_svr4_errno,
183  0,
184  svr4_fixup,
185  svr4_sendsig,
186  svr4_sigcode,
187  &svr4_szsigcode,
188  NULL,
189  "SVR4",
190  elf_coredump
191};
192
193Elf32_Brandinfo svr4_brand = {
194  "SVR4",
195  "/compat/svr4",
196  "/lib/libc.so.1",
197  &svr4_sysvec
198};
199
200const char      svr4_emul_path[] = "/compat/svr4";
201
202static int
203svr4_fixup(long **stack_base, struct image_params *imgp)
204{
205	Elf32_Auxargs *args = (Elf32_Auxargs *)imgp->auxargs;
206	long *pos;
207
208	pos = *stack_base + (imgp->argc + imgp->envc + 2);
209
210	if (args->trace) {
211		AUXARGS_ENTRY(pos, AT_DEBUG, 1);
212	}
213	if (args->execfd != -1) {
214		AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
215	}
216	AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
217	AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
218	AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
219	AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
220	AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
221	AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
222	AUXARGS_ENTRY(pos, AT_BASE, args->base);
223	AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_cred->p_ruid);
224	AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_cred->p_svuid);
225	AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_cred->p_rgid);
226	AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_cred->p_svgid);
227	AUXARGS_ENTRY(pos, AT_NULL, 0);
228
229	free(imgp->auxargs, M_TEMP);
230	imgp->auxargs = NULL;
231
232	(*stack_base)--;
233	**stack_base = (int)imgp->argc;
234	return 0;
235}
236
237/*
238 * Search an alternate path before passing pathname arguments on
239 * to system calls. Useful for keeping a seperate 'emulation tree'.
240 *
241 * If cflag is set, we check if an attempt can be made to create
242 * the named file, i.e. we check if the directory it should
243 * be in exists.
244 *
245 * Code shamelessly stolen by Mark Newton from IBCS2 emulation code.
246 */
247int
248svr4_emul_find(p, sgp, prefix, path, pbuf, cflag)
249	struct proc	 *p;
250	caddr_t		 *sgp;		/* Pointer to stackgap memory */
251	const char	 *prefix;
252	char		 *path;
253	char		**pbuf;
254	int		  cflag;
255{
256	struct nameidata	 nd;
257	struct nameidata	 ndroot;
258	struct vattr		 vat;
259	struct vattr		 vatroot;
260	int			 error;
261	char			*ptr, *buf, *cp;
262	size_t			 sz, len;
263
264	buf = (char *) malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
265	*pbuf = path;
266
267	for (ptr = buf; (*ptr = *prefix) != '\0'; ptr++, prefix++)
268		continue;
269
270	sz = MAXPATHLEN - (ptr - buf);
271
272	/*
273	 * If sgp is not given then the path is already in kernel space
274	 */
275	if (sgp == NULL)
276		error = copystr(path, ptr, sz, &len);
277	else
278		error = copyinstr(path, ptr, sz, &len);
279
280	if (error) {
281		free(buf, M_TEMP);
282		return error;
283	}
284
285	if (*ptr != '/') {
286		free(buf, M_TEMP);
287		return EINVAL;
288	}
289
290	/*
291	 * We know that there is a / somewhere in this pathname.
292	 * Search backwards for it, to find the file's parent dir
293	 * to see if it exists in the alternate tree. If it does,
294	 * and we want to create a file (cflag is set). We don't
295	 * need to worry about the root comparison in this case.
296	 */
297
298	if (cflag) {
299		for (cp = &ptr[len] - 1; *cp != '/'; cp--);
300		*cp = '\0';
301
302		NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, p);
303
304		if ((error = namei(&nd)) != 0) {
305			free(buf, M_TEMP);
306			return error;
307		}
308
309		*cp = '/';
310	}
311	else {
312		NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, p);
313
314		if ((error = namei(&nd)) != 0) {
315			free(buf, M_TEMP);
316			return error;
317		}
318
319		/*
320		 * We now compare the vnode of the svr4_root to the one
321		 * vnode asked. If they resolve to be the same, then we
322		 * ignore the match so that the real root gets used.
323		 * This avoids the problem of traversing "../.." to find the
324		 * root directory and never finding it, because "/" resolves
325		 * to the emulation root directory. This is expensive :-(
326		 */
327		NDINIT(&ndroot, LOOKUP, FOLLOW, UIO_SYSSPACE, svr4_emul_path,
328		       p);
329
330		if ((error = namei(&ndroot)) != 0) {
331			/* Cannot happen! */
332			free(buf, M_TEMP);
333			vrele(nd.ni_vp);
334			return error;
335		}
336
337		if ((error = VOP_GETATTR(nd.ni_vp, &vat, p->p_ucred, p)) != 0) {
338			goto done;
339		}
340
341		if ((error = VOP_GETATTR(ndroot.ni_vp, &vatroot, p->p_ucred, p))
342		    != 0) {
343			goto done;
344		}
345
346		if (vat.va_fsid == vatroot.va_fsid &&
347		    vat.va_fileid == vatroot.va_fileid) {
348			error = ENOENT;
349			goto done;
350		}
351
352	}
353	if (sgp == NULL)
354		*pbuf = buf;
355	else {
356		sz = &ptr[len] - buf;
357		*pbuf = stackgap_alloc(sgp, sz + 1);
358		error = copyout(buf, *pbuf, sz);
359		free(buf, M_TEMP);
360	}
361
362
363done:
364	vrele(nd.ni_vp);
365	if (!cflag)
366		vrele(ndroot.ni_vp);
367	return error;
368}
369
370static int
371svr4_elf_modevent(module_t mod, int type, void *data)
372{
373	int error;
374
375	error = 0;
376
377	switch(type) {
378	case MOD_LOAD:
379		if (elf_insert_brand_entry(&svr4_brand) < 0)
380			error = EINVAL;
381		if (error)
382			printf("cannot insert svr4 elf brand handler\n");
383		else if (bootverbose)
384			printf("svr4 ELF exec handler installed\n");
385		break;
386	case MOD_UNLOAD:
387		/* Only allow the emulator to be removed if it isn't in use. */
388		if (elf_brand_inuse(&svr4_brand) != 0) {
389			error = EBUSY;
390		} else if (elf_remove_brand_entry(&svr4_brand) < 0) {
391			error = EINVAL;
392		}
393
394		if (error)
395			printf("Could not deinstall ELF interpreter entry (error %d)\n",
396			       error);
397		else if (bootverbose)
398			printf("svr4 ELF exec handler removed\n");
399		break;
400	default:
401		break;
402	}
403	return error;
404}
405
406static moduledata_t svr4_elf_mod = {
407	"svr4elf",
408	svr4_elf_modevent,
409	0
410};
411DECLARE_MODULE(svr4elf, svr4_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
412