svr4_sysvec.c revision 112470 
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 112470 2003-03-21 19:49:34Z 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/lock.h>
48#include <sys/malloc.h>
49#include <sys/mutex.h>
50#include <sys/namei.h>
51#include <sys/vnode.h>
52#include <sys/module.h>
53#include <vm/vm.h>
54#include <sys/exec.h>
55#include <sys/kernel.h>
56#include <machine/cpu.h>
57#include <netinet/in.h>
58
59#include <compat/svr4/svr4.h>
60#include <compat/svr4/svr4_types.h>
61#include <compat/svr4/svr4_syscall.h>
62#include <compat/svr4/svr4_signal.h>
63#include <compat/svr4/svr4_sockio.h>
64#include <compat/svr4/svr4_socket.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};
194
195Elf32_Brandinfo svr4_brand = {
196  ELFOSABI_SYSV,
197  EM_386,			/* XXX only implemented for x86 so far. */
198  "SVR4",
199  svr4_emul_path,
200  "/lib/libc.so.1",
201  &svr4_sysvec
202};
203
204const char      svr4_emul_path[] = "/compat/svr4";
205
206static int
207svr4_fixup(register_t **stack_base, struct image_params *imgp)
208{
209	Elf32_Auxargs *args;
210	register_t *pos;
211
212	KASSERT(curthread->td_proc == imgp->proc &&
213	    (curthread->td_proc->p_flag & P_THREADED) == 0,
214	    ("unsafe svr4_fixup(), should be curproc"));
215	args = (Elf32_Auxargs *)imgp->auxargs;
216	pos = *stack_base + (imgp->argc + imgp->envc + 2);
217
218	if (args->trace)
219		AUXARGS_ENTRY(pos, AT_DEBUG, 1);
220	if (args->execfd != -1)
221		AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
222	AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
223	AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
224	AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
225	AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
226	AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
227	AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
228	AUXARGS_ENTRY(pos, AT_BASE, args->base);
229	AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
230	AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
231	AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
232	AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
233	AUXARGS_ENTRY(pos, AT_NULL, 0);
234
235	free(imgp->auxargs, M_TEMP);
236	imgp->auxargs = NULL;
237
238	(*stack_base)--;
239	**stack_base = (register_t)imgp->argc;
240	return 0;
241}
242
243/*
244 * Search an alternate path before passing pathname arguments on
245 * to system calls. Useful for keeping a separate 'emulation tree'.
246 *
247 * If cflag is set, we check if an attempt can be made to create
248 * the named file, i.e. we check if the directory it should
249 * be in exists.
250 *
251 * Code shamelessly stolen by Mark Newton from IBCS2 emulation code.
252 */
253int
254svr4_emul_find(td, sgp, prefix, path, pbuf, cflag)
255	struct thread	 *td;
256	caddr_t		 *sgp;		/* Pointer to stackgap memory */
257	const char	 *prefix;
258	char		 *path;
259	char		**pbuf;
260	int		  cflag;
261{
262	struct nameidata	 nd;
263	struct nameidata	 ndroot;
264	struct vattr		 vat;
265	struct vattr		 vatroot;
266	int			 error;
267	char			*ptr, *buf, *cp;
268	size_t			 sz, len;
269
270	buf = (char *) malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
271	*pbuf = path;
272
273	for (ptr = buf; (*ptr = *prefix) != '\0'; ptr++, prefix++)
274		continue;
275
276	sz = MAXPATHLEN - (ptr - buf);
277
278	/*
279	 * If sgp is not given then the path is already in kernel space
280	 */
281	if (sgp == NULL)
282		error = copystr(path, ptr, sz, &len);
283	else
284		error = copyinstr(path, ptr, sz, &len);
285
286	if (error) {
287		free(buf, M_TEMP);
288		return error;
289	}
290
291	if (*ptr != '/') {
292		free(buf, M_TEMP);
293		return EINVAL;
294	}
295
296	/*
297	 * We know that there is a / somewhere in this pathname.
298	 * Search backwards for it, to find the file's parent dir
299	 * to see if it exists in the alternate tree. If it does,
300	 * and we want to create a file (cflag is set). We don't
301	 * need to worry about the root comparison in this case.
302	 */
303
304	if (cflag) {
305		for (cp = &ptr[len] - 1; *cp != '/'; cp--);
306		*cp = '\0';
307
308		NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, td);
309
310		if ((error = namei(&nd)) != 0) {
311			free(buf, M_TEMP);
312			return error;
313		}
314		NDFREE(&nd, NDF_ONLY_PNBUF);
315
316		*cp = '/';
317	}
318	else {
319		NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, td);
320
321		if ((error = namei(&nd)) != 0) {
322			free(buf, M_TEMP);
323			return error;
324		}
325		NDFREE(&nd, NDF_ONLY_PNBUF);
326
327		/*
328		 * We now compare the vnode of the svr4_root to the one
329		 * vnode asked. If they resolve to be the same, then we
330		 * ignore the match so that the real root gets used.
331		 * This avoids the problem of traversing "../.." to find the
332		 * root directory and never finding it, because "/" resolves
333		 * to the emulation root directory. This is expensive :-(
334		 */
335		NDINIT(&ndroot, LOOKUP, FOLLOW, UIO_SYSSPACE, svr4_emul_path,
336		       td);
337
338		if ((error = namei(&ndroot)) != 0) {
339			/* Cannot happen! */
340			free(buf, M_TEMP);
341			vrele(nd.ni_vp);
342			return error;
343		}
344		NDFREE(&ndroot, NDF_ONLY_PNBUF);
345
346		if ((error = VOP_GETATTR(nd.ni_vp, &vat, td->td_ucred, td)) != 0) {
347			goto done;
348		}
349
350		if ((error = VOP_GETATTR(ndroot.ni_vp, &vatroot, td->td_ucred, td))
351		    != 0) {
352			goto done;
353		}
354
355		if (vat.va_fsid == vatroot.va_fsid &&
356		    vat.va_fileid == vatroot.va_fileid) {
357			error = ENOENT;
358			goto done;
359		}
360
361	}
362	if (sgp == NULL)
363		*pbuf = buf;
364	else {
365		sz = &ptr[len] - buf;
366		*pbuf = stackgap_alloc(sgp, sz + 1);
367		error = copyout(buf, *pbuf, sz);
368		free(buf, M_TEMP);
369	}
370
371
372done:
373	vrele(nd.ni_vp);
374	if (!cflag)
375		vrele(ndroot.ni_vp);
376	return error;
377}
378
379static int
380svr4_elf_modevent(module_t mod, int type, void *data)
381{
382	int error;
383
384	error = 0;
385
386	switch(type) {
387	case MOD_LOAD:
388		if (elf32_insert_brand_entry(&svr4_brand) < 0)
389			error = EINVAL;
390		if (error)
391			printf("cannot insert svr4 elf brand handler\n");
392		else if (bootverbose)
393			printf("svr4 ELF exec handler installed\n");
394		break;
395	case MOD_UNLOAD:
396		/* Only allow the emulator to be removed if it isn't in use. */
397		if (elf32_brand_inuse(&svr4_brand) != 0) {
398			error = EBUSY;
399		} else if (elf32_remove_brand_entry(&svr4_brand) < 0) {
400			error = EINVAL;
401		}
402
403		if (error)
404			printf("Could not deinstall ELF interpreter entry (error %d)\n",
405			       error);
406		else if (bootverbose)
407			printf("svr4 ELF exec handler removed\n");
408		break;
409	default:
410		break;
411	}
412	return error;
413}
414
415static moduledata_t svr4_elf_mod = {
416	"svr4elf",
417	svr4_elf_modevent,
418	0
419};
420DECLARE_MODULE(svr4elf, svr4_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
421MODULE_DEPEND(svr4elf, streams, 1, 1, 1);
422