svr4_sysvec.c revision 177127 
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 177127 2008-03-12 22:17:06Z jeff $");
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/lock.h>
48#include <sys/malloc.h>
49#include <sys/module.h>
50#include <sys/mutex.h>
51#include <sys/namei.h>
52#include <sys/socket.h>
53#include <sys/syscallsubr.h>
54#include <sys/vnode.h>
55#include <vm/vm.h>
56#include <sys/exec.h>
57#include <sys/kernel.h>
58#include <machine/cpu.h>
59#include <netinet/in.h>
60
61#include <compat/svr4/svr4.h>
62#include <compat/svr4/svr4_types.h>
63#include <compat/svr4/svr4_syscall.h>
64#include <compat/svr4/svr4_signal.h>
65#include <compat/svr4/svr4_socket.h>
66#include <compat/svr4/svr4_sockio.h>
67#include <compat/svr4/svr4_errno.h>
68#include <compat/svr4/svr4_proto.h>
69#include <compat/svr4/svr4_siginfo.h>
70#include <compat/svr4/svr4_util.h>
71
72int bsd_to_svr4_errno[ELAST+1] = {
73        0,
74        SVR4_EPERM,
75        SVR4_ENOENT,
76        SVR4_ESRCH,
77        SVR4_EINTR,
78        SVR4_EIO,
79        SVR4_ENXIO,
80        SVR4_E2BIG,
81        SVR4_ENOEXEC,
82        SVR4_EBADF,
83        SVR4_ECHILD,
84        SVR4_EDEADLK,
85        SVR4_ENOMEM,
86        SVR4_EACCES,
87        SVR4_EFAULT,
88        SVR4_ENOTBLK,
89        SVR4_EBUSY,
90        SVR4_EEXIST,
91        SVR4_EXDEV,
92        SVR4_ENODEV,
93        SVR4_ENOTDIR,
94        SVR4_EISDIR,
95        SVR4_EINVAL,
96        SVR4_ENFILE,
97        SVR4_EMFILE,
98        SVR4_ENOTTY,
99        SVR4_ETXTBSY,
100        SVR4_EFBIG,
101        SVR4_ENOSPC,
102        SVR4_ESPIPE,
103        SVR4_EROFS,
104        SVR4_EMLINK,
105        SVR4_EPIPE,
106        SVR4_EDOM,
107        SVR4_ERANGE,
108        SVR4_EAGAIN,
109        SVR4_EINPROGRESS,
110        SVR4_EALREADY,
111        SVR4_ENOTSOCK,
112        SVR4_EDESTADDRREQ,
113        SVR4_EMSGSIZE,
114        SVR4_EPROTOTYPE,
115        SVR4_ENOPROTOOPT,
116        SVR4_EPROTONOSUPPORT,
117        SVR4_ESOCKTNOSUPPORT,
118        SVR4_EOPNOTSUPP,
119        SVR4_EPFNOSUPPORT,
120        SVR4_EAFNOSUPPORT,
121        SVR4_EADDRINUSE,
122        SVR4_EADDRNOTAVAIL,
123        SVR4_ENETDOWN,
124        SVR4_ENETUNREACH,
125        SVR4_ENETRESET,
126        SVR4_ECONNABORTED,
127        SVR4_ECONNRESET,
128        SVR4_ENOBUFS,
129        SVR4_EISCONN,
130        SVR4_ENOTCONN,
131        SVR4_ESHUTDOWN,
132        SVR4_ETOOMANYREFS,
133        SVR4_ETIMEDOUT,
134        SVR4_ECONNREFUSED,
135        SVR4_ELOOP,
136        SVR4_ENAMETOOLONG,
137        SVR4_EHOSTDOWN,
138        SVR4_EHOSTUNREACH,
139        SVR4_ENOTEMPTY,
140        SVR4_EPROCLIM,
141        SVR4_EUSERS,
142        SVR4_EDQUOT,
143        SVR4_ESTALE,
144        SVR4_EREMOTE,
145        SVR4_EBADRPC,
146        SVR4_ERPCMISMATCH,
147        SVR4_EPROGUNAVAIL,
148        SVR4_EPROGMISMATCH,
149        SVR4_EPROCUNAVAIL,
150        SVR4_ENOLCK,
151        SVR4_ENOSYS,
152        SVR4_EFTYPE,
153        SVR4_EAUTH,
154        SVR4_ENEEDAUTH,
155        SVR4_EIDRM,
156        SVR4_ENOMSG,
157};
158
159
160static int 	svr4_fixup(register_t **stack_base, struct image_params *imgp);
161
162extern struct sysent svr4_sysent[];
163#undef szsigcode
164#undef sigcode
165
166extern int svr4_szsigcode;
167extern char svr4_sigcode[];
168
169struct sysentvec svr4_sysvec = {
170  SVR4_SYS_MAXSYSCALL,
171  svr4_sysent,
172  0xff,
173  SVR4_NSIG-1,		/* NB: signal trans table indexed with signno-1 */
174  bsd_to_svr4_sig+1,
175  ELAST,  /* ELAST */
176  bsd_to_svr4_errno,
177  NULL,
178  svr4_fixup,
179  svr4_sendsig,
180  svr4_sigcode,
181  &svr4_szsigcode,
182  NULL,
183  "SVR4",
184  elf32_coredump,
185  NULL,
186  SVR4_MINSIGSTKSZ,
187  PAGE_SIZE,
188  VM_MIN_ADDRESS,
189  VM_MAXUSER_ADDRESS,
190  USRSTACK,
191  PS_STRINGS,
192  VM_PROT_ALL,
193  exec_copyout_strings,
194  exec_setregs,
195  NULL
196};
197
198const char      svr4_emul_path[] = "/compat/svr4";
199
200Elf32_Brandinfo svr4_brand = {
201  ELFOSABI_SYSV,
202  EM_386,			/* XXX only implemented for x86 so far. */
203  "SVR4",
204  svr4_emul_path,
205  "/lib/libc.so.1",
206  &svr4_sysvec,
207  NULL,
208};
209
210static int
211svr4_fixup(register_t **stack_base, struct image_params *imgp)
212{
213	Elf32_Auxargs *args;
214	register_t *pos;
215
216	KASSERT(curthread->td_proc == imgp->proc,
217	    ("unsafe svr4_fixup(), should be curproc"));
218	args = (Elf32_Auxargs *)imgp->auxargs;
219	pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2);
220
221	if (args->trace)
222		AUXARGS_ENTRY(pos, AT_DEBUG, 1);
223	if (args->execfd != -1)
224		AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
225	AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
226	AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
227	AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
228	AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
229	AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
230	AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
231	AUXARGS_ENTRY(pos, AT_BASE, args->base);
232	AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
233	AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
234	AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
235	AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
236	AUXARGS_ENTRY(pos, AT_NULL, 0);
237
238	free(imgp->auxargs, M_TEMP);
239	imgp->auxargs = NULL;
240
241	(*stack_base)--;
242	**stack_base = (register_t)imgp->args->argc;
243	return 0;
244}
245
246/*
247 * Search an alternate path before passing pathname arguments on
248 * to system calls. Useful for keeping a separate 'emulation tree'.
249 *
250 * If cflag is set, we check if an attempt can be made to create
251 * the named file, i.e. we check if the directory it should
252 * be in exists.
253 */
254int
255svr4_emul_find(struct thread *td, char *path, enum uio_seg pathseg,
256    char **pbuf, int create)
257{
258
259	return (kern_alternate_path(td, svr4_emul_path, path, pathseg, pbuf,
260	    create));
261}
262
263static int
264svr4_elf_modevent(module_t mod, int type, void *data)
265{
266	int error;
267
268	error = 0;
269
270	switch(type) {
271	case MOD_LOAD:
272		if (elf32_insert_brand_entry(&svr4_brand) < 0) {
273			printf("cannot insert svr4 elf brand handler\n");
274			error = EINVAL;
275			break;
276		}
277		if (bootverbose)
278			printf("svr4 ELF exec handler installed\n");
279		svr4_sockcache_init();
280		break;
281	case MOD_UNLOAD:
282		/* Only allow the emulator to be removed if it isn't in use. */
283		if (elf32_brand_inuse(&svr4_brand) != 0) {
284			error = EBUSY;
285		} else if (elf32_remove_brand_entry(&svr4_brand) < 0) {
286			error = EINVAL;
287		}
288
289		if (error) {
290			printf("Could not deinstall ELF interpreter entry (error %d)\n",
291			       error);
292			break;
293		}
294		if (bootverbose)
295			printf("svr4 ELF exec handler removed\n");
296		svr4_sockcache_destroy();
297		break;
298	default:
299		return (EOPNOTSUPP);
300		break;
301	}
302	return error;
303}
304
305static moduledata_t svr4_elf_mod = {
306	"svr4elf",
307	svr4_elf_modevent,
308	0
309};
310DECLARE_MODULE(svr4elf, svr4_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
311MODULE_DEPEND(svr4elf, streams, 1, 1, 1);
312