svr4_sysvec.c revision 71454 
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 71454 2001-01-23 21:33:55Z jhb $
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_emul_path,
188  "/lib/libc.so.1",
189  &svr4_sysvec
190};
191
192const char      svr4_emul_path[] = "/compat/svr4";
193
194static int
195svr4_fixup(register_t **stack_base, struct image_params *imgp)
196{
197	Elf32_Auxargs *args = (Elf32_Auxargs *)imgp->auxargs;
198	register_t *pos;
199
200	pos = *stack_base + (imgp->argc + imgp->envc + 2);
201
202	if (args->trace) {
203		AUXARGS_ENTRY(pos, AT_DEBUG, 1);
204	}
205	if (args->execfd != -1) {
206		AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
207	}
208	AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
209	AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
210	AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
211	AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
212	AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
213	AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
214	AUXARGS_ENTRY(pos, AT_BASE, args->base);
215	PROC_LOCK(imgp->proc);
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	PROC_UNLOCK(imgp->proc);
221	AUXARGS_ENTRY(pos, AT_NULL, 0);
222
223	free(imgp->auxargs, M_TEMP);
224	imgp->auxargs = NULL;
225
226	(*stack_base)--;
227	**stack_base = (int)imgp->argc;
228	return 0;
229}
230
231/*
232 * Search an alternate path before passing pathname arguments on
233 * to system calls. Useful for keeping a seperate 'emulation tree'.
234 *
235 * If cflag is set, we check if an attempt can be made to create
236 * the named file, i.e. we check if the directory it should
237 * be in exists.
238 *
239 * Code shamelessly stolen by Mark Newton from IBCS2 emulation code.
240 */
241int
242svr4_emul_find(p, sgp, prefix, path, pbuf, cflag)
243	struct proc	 *p;
244	caddr_t		 *sgp;		/* Pointer to stackgap memory */
245	const char	 *prefix;
246	char		 *path;
247	char		**pbuf;
248	int		  cflag;
249{
250	struct nameidata	 nd;
251	struct nameidata	 ndroot;
252	struct vattr		 vat;
253	struct vattr		 vatroot;
254	struct ucred		*uc;
255	int			 error;
256	char			*ptr, *buf, *cp;
257	size_t			 sz, len;
258
259	buf = (char *) malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
260	*pbuf = path;
261
262	for (ptr = buf; (*ptr = *prefix) != '\0'; ptr++, prefix++)
263		continue;
264
265	sz = MAXPATHLEN - (ptr - buf);
266
267	/*
268	 * If sgp is not given then the path is already in kernel space
269	 */
270	if (sgp == NULL)
271		error = copystr(path, ptr, sz, &len);
272	else
273		error = copyinstr(path, ptr, sz, &len);
274
275	if (error) {
276		free(buf, M_TEMP);
277		return error;
278	}
279
280	if (*ptr != '/') {
281		free(buf, M_TEMP);
282		return EINVAL;
283	}
284
285	/*
286	 * We know that there is a / somewhere in this pathname.
287	 * Search backwards for it, to find the file's parent dir
288	 * to see if it exists in the alternate tree. If it does,
289	 * and we want to create a file (cflag is set). We don't
290	 * need to worry about the root comparison in this case.
291	 */
292
293	if (cflag) {
294		for (cp = &ptr[len] - 1; *cp != '/'; cp--);
295		*cp = '\0';
296
297		NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, p);
298
299		if ((error = namei(&nd)) != 0) {
300			free(buf, M_TEMP);
301			return error;
302		}
303		NDFREE(&nd, NDF_ONLY_PNBUF);
304
305		*cp = '/';
306	}
307	else {
308		NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, p);
309
310		if ((error = namei(&nd)) != 0) {
311			free(buf, M_TEMP);
312			return error;
313		}
314		NDFREE(&nd, NDF_ONLY_PNBUF);
315
316		/*
317		 * We now compare the vnode of the svr4_root to the one
318		 * vnode asked. If they resolve to be the same, then we
319		 * ignore the match so that the real root gets used.
320		 * This avoids the problem of traversing "../.." to find the
321		 * root directory and never finding it, because "/" resolves
322		 * to the emulation root directory. This is expensive :-(
323		 */
324		NDINIT(&ndroot, LOOKUP, FOLLOW, UIO_SYSSPACE, svr4_emul_path,
325		       p);
326
327		if ((error = namei(&ndroot)) != 0) {
328			/* Cannot happen! */
329			free(buf, M_TEMP);
330			vrele(nd.ni_vp);
331			return error;
332		}
333		NDFREE(&ndroot, NDF_ONLY_PNBUF);
334
335		PROC_LOCK(p);
336		uc = p->p_ucred;
337		crhold(uc);
338		PROC_UNLOCK(p);
339		if ((error = VOP_GETATTR(nd.ni_vp, &vat, uc, p)) != 0) {
340			crfree(uc);
341			goto done;
342		}
343
344		if ((error = VOP_GETATTR(ndroot.ni_vp, &vatroot, uc, p)) != 0) {
345			crfree(uc);
346			goto done;
347		}
348		crfree(uc);
349
350		if (vat.va_fsid == vatroot.va_fsid &&
351		    vat.va_fileid == vatroot.va_fileid) {
352			error = ENOENT;
353			goto done;
354		}
355
356	}
357	if (sgp == NULL)
358		*pbuf = buf;
359	else {
360		sz = &ptr[len] - buf;
361		*pbuf = stackgap_alloc(sgp, sz + 1);
362		error = copyout(buf, *pbuf, sz);
363		free(buf, M_TEMP);
364	}
365
366
367done:
368	vrele(nd.ni_vp);
369	if (!cflag)
370		vrele(ndroot.ni_vp);
371	return error;
372}
373
374static int
375svr4_elf_modevent(module_t mod, int type, void *data)
376{
377	int error;
378
379	error = 0;
380
381	switch(type) {
382	case MOD_LOAD:
383		if (elf_insert_brand_entry(&svr4_brand) < 0)
384			error = EINVAL;
385		if (error)
386			printf("cannot insert svr4 elf brand handler\n");
387		else if (bootverbose)
388			printf("svr4 ELF exec handler installed\n");
389		break;
390	case MOD_UNLOAD:
391		/* Only allow the emulator to be removed if it isn't in use. */
392		if (elf_brand_inuse(&svr4_brand) != 0) {
393			error = EBUSY;
394		} else if (elf_remove_brand_entry(&svr4_brand) < 0) {
395			error = EINVAL;
396		}
397
398		if (error)
399			printf("Could not deinstall ELF interpreter entry (error %d)\n",
400			       error);
401		else if (bootverbose)
402			printf("svr4 ELF exec handler removed\n");
403		break;
404	default:
405		break;
406	}
407	return error;
408}
409
410static moduledata_t svr4_elf_mod = {
411	"svr4elf",
412	svr4_elf_modevent,
413	0
414};
415DECLARE_MODULE(svr4elf, svr4_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
416MODULE_DEPEND(svr4elf, streams, 1, 1, 1);
417