svr4_sysvec.c revision 140992 
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 140992 2005-01-29 23:12:00Z sobomax $");
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,
203  NULL,
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->args->argc + imgp->args->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->args->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		return (EOPNOTSUPP);
415		break;
416	}
417	return error;
418}
419
420static moduledata_t svr4_elf_mod = {
421	"svr4elf",
422	svr4_elf_modevent,
423	0
424};
425DECLARE_MODULE(svr4elf, svr4_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
426MODULE_DEPEND(svr4elf, streams, 1, 1, 1);
427