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("$FreeBSD$");
33
34/* XXX we use functions that might not exist. */
35#include "opt_compat.h"
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/proc.h>
40#include <sys/sysent.h>
41#include <sys/imgact.h>
42#include <sys/imgact_elf.h>
43#include <sys/fcntl.h>
44#include <sys/lock.h>
45#include <sys/malloc.h>
46#include <sys/module.h>
47#include <sys/mutex.h>
48#include <sys/namei.h>
49#include <sys/socket.h>
50#include <sys/syscallsubr.h>
51#include <sys/vnode.h>
52#include <vm/vm.h>
53#include <sys/exec.h>
54#include <sys/kernel.h>
55#include <machine/cpu.h>
56#include <netinet/in.h>
57
58#include <compat/svr4/svr4.h>
59#include <compat/svr4/svr4_types.h>
60#include <compat/svr4/svr4_syscall.h>
61#include <compat/svr4/svr4_signal.h>
62#include <compat/svr4/svr4_socket.h>
63#include <compat/svr4/svr4_sockio.h>
64#include <compat/svr4/svr4_errno.h>
65#include <compat/svr4/svr4_proto.h>
66#include <compat/svr4/svr4_siginfo.h>
67#include <compat/svr4/svr4_util.h>
68
69int bsd_to_svr4_errno[ELAST+1] = {
70        0,
71        SVR4_EPERM,
72        SVR4_ENOENT,
73        SVR4_ESRCH,
74        SVR4_EINTR,
75        SVR4_EIO,
76        SVR4_ENXIO,
77        SVR4_E2BIG,
78        SVR4_ENOEXEC,
79        SVR4_EBADF,
80        SVR4_ECHILD,
81        SVR4_EDEADLK,
82        SVR4_ENOMEM,
83        SVR4_EACCES,
84        SVR4_EFAULT,
85        SVR4_ENOTBLK,
86        SVR4_EBUSY,
87        SVR4_EEXIST,
88        SVR4_EXDEV,
89        SVR4_ENODEV,
90        SVR4_ENOTDIR,
91        SVR4_EISDIR,
92        SVR4_EINVAL,
93        SVR4_ENFILE,
94        SVR4_EMFILE,
95        SVR4_ENOTTY,
96        SVR4_ETXTBSY,
97        SVR4_EFBIG,
98        SVR4_ENOSPC,
99        SVR4_ESPIPE,
100        SVR4_EROFS,
101        SVR4_EMLINK,
102        SVR4_EPIPE,
103        SVR4_EDOM,
104        SVR4_ERANGE,
105        SVR4_EAGAIN,
106        SVR4_EINPROGRESS,
107        SVR4_EALREADY,
108        SVR4_ENOTSOCK,
109        SVR4_EDESTADDRREQ,
110        SVR4_EMSGSIZE,
111        SVR4_EPROTOTYPE,
112        SVR4_ENOPROTOOPT,
113        SVR4_EPROTONOSUPPORT,
114        SVR4_ESOCKTNOSUPPORT,
115        SVR4_EOPNOTSUPP,
116        SVR4_EPFNOSUPPORT,
117        SVR4_EAFNOSUPPORT,
118        SVR4_EADDRINUSE,
119        SVR4_EADDRNOTAVAIL,
120        SVR4_ENETDOWN,
121        SVR4_ENETUNREACH,
122        SVR4_ENETRESET,
123        SVR4_ECONNABORTED,
124        SVR4_ECONNRESET,
125        SVR4_ENOBUFS,
126        SVR4_EISCONN,
127        SVR4_ENOTCONN,
128        SVR4_ESHUTDOWN,
129        SVR4_ETOOMANYREFS,
130        SVR4_ETIMEDOUT,
131        SVR4_ECONNREFUSED,
132        SVR4_ELOOP,
133        SVR4_ENAMETOOLONG,
134        SVR4_EHOSTDOWN,
135        SVR4_EHOSTUNREACH,
136        SVR4_ENOTEMPTY,
137        SVR4_EPROCLIM,
138        SVR4_EUSERS,
139        SVR4_EDQUOT,
140        SVR4_ESTALE,
141        SVR4_EREMOTE,
142        SVR4_EBADRPC,
143        SVR4_ERPCMISMATCH,
144        SVR4_EPROGUNAVAIL,
145        SVR4_EPROGMISMATCH,
146        SVR4_EPROCUNAVAIL,
147        SVR4_ENOLCK,
148        SVR4_ENOSYS,
149        SVR4_EFTYPE,
150        SVR4_EAUTH,
151        SVR4_ENEEDAUTH,
152        SVR4_EIDRM,
153        SVR4_ENOMSG,
154};
155
156
157static int 	svr4_fixup(register_t **stack_base, struct image_params *imgp);
158
159extern struct sysent svr4_sysent[];
160#undef szsigcode
161#undef sigcode
162
163extern int svr4_szsigcode;
164extern char svr4_sigcode[];
165
166struct sysentvec svr4_sysvec = {
167	.sv_size	= SVR4_SYS_MAXSYSCALL,
168	.sv_table	= svr4_sysent,
169	.sv_mask	= 0xff,
170	.sv_errsize	= ELAST,  /* ELAST */
171	.sv_errtbl	= bsd_to_svr4_errno,
172	.sv_transtrap	= NULL,
173	.sv_fixup	= svr4_fixup,
174	.sv_sendsig	= svr4_sendsig,
175	.sv_sigcode	= svr4_sigcode,
176	.sv_szsigcode	= &svr4_szsigcode,
177	.sv_name	= "SVR4",
178	.sv_coredump	= elf32_coredump,
179	.sv_imgact_try	= NULL,
180	.sv_minsigstksz	= SVR4_MINSIGSTKSZ,
181	.sv_pagesize	= PAGE_SIZE,
182	.sv_minuser	= VM_MIN_ADDRESS,
183	.sv_maxuser	= VM_MAXUSER_ADDRESS,
184	.sv_usrstack	= USRSTACK,
185	.sv_psstrings	= PS_STRINGS,
186	.sv_stackprot	= VM_PROT_ALL,
187	.sv_copyout_strings = exec_copyout_strings,
188	.sv_setregs	= exec_setregs,
189	.sv_fixlimit	= NULL,
190	.sv_maxssiz     = NULL,
191	.sv_flags	= SV_ABI_UNDEF | SV_IA32 | SV_ILP32,
192	.sv_set_syscall_retval = cpu_set_syscall_retval,
193	.sv_fetch_syscall_args = cpu_fetch_syscall_args,
194	.sv_syscallnames = NULL,
195	.sv_schedtail	= NULL,
196	.sv_thread_detach = NULL,
197	.sv_trap	= NULL,
198};
199
200const char      svr4_emul_path[] = "/compat/svr4";
201
202Elf32_Brandinfo svr4_brand = {
203	.brand		= ELFOSABI_SYSV,
204	.machine	= EM_386, /* XXX only implemented for x86 so far. */
205	.compat_3_brand	= "SVR4",
206	.emul_path	= svr4_emul_path,
207	.interp_path	= "/lib/libc.so.1",
208	.sysvec		= &svr4_sysvec,
209	.interp_newpath	= NULL,
210	.brand_note	= NULL,
211	.flags		= 0
212};
213
214static int
215svr4_fixup(register_t **stack_base, struct image_params *imgp)
216{
217	Elf32_Auxargs *args;
218	register_t *pos;
219
220	KASSERT(curthread->td_proc == imgp->proc,
221	    ("unsafe svr4_fixup(), should be curproc"));
222	args = (Elf32_Auxargs *)imgp->auxargs;
223	pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2);
224
225	if (args->execfd != -1)
226		AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
227	AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
228	AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
229	AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
230	AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
231	AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
232	AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
233	AUXARGS_ENTRY(pos, AT_BASE, args->base);
234	AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
235	AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
236	AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
237	AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
238	AUXARGS_ENTRY(pos, AT_NULL, 0);
239
240	free(imgp->auxargs, M_TEMP);
241	imgp->auxargs = NULL;
242
243	(*stack_base)--;
244	**stack_base = (register_t)imgp->args->argc;
245	return 0;
246}
247
248/*
249 * Search an alternate path before passing pathname arguments on
250 * to system calls. Useful for keeping a separate 'emulation tree'.
251 *
252 * If cflag is set, we check if an attempt can be made to create
253 * the named file, i.e. we check if the directory it should
254 * be in exists.
255 */
256int
257svr4_emul_find(struct thread *td, char *path, enum uio_seg pathseg,
258    char **pbuf, int create)
259{
260
261	return (kern_alternate_path(td, svr4_emul_path, path, pathseg, pbuf,
262	    create, AT_FDCWD));
263}
264
265static int
266svr4_elf_modevent(module_t mod, int type, void *data)
267{
268	int error;
269
270	error = 0;
271
272	switch(type) {
273	case MOD_LOAD:
274		if (elf32_insert_brand_entry(&svr4_brand) < 0) {
275			printf("cannot insert svr4 elf brand handler\n");
276			error = EINVAL;
277			break;
278		}
279		if (bootverbose)
280			printf("svr4 ELF exec handler installed\n");
281		svr4_sockcache_init();
282		break;
283	case MOD_UNLOAD:
284		/* Only allow the emulator to be removed if it isn't in use. */
285		if (elf32_brand_inuse(&svr4_brand) != 0) {
286			error = EBUSY;
287		} else if (elf32_remove_brand_entry(&svr4_brand) < 0) {
288			error = EINVAL;
289		}
290
291		if (error) {
292			printf("Could not deinstall ELF interpreter entry (error %d)\n",
293			       error);
294			break;
295		}
296		if (bootverbose)
297			printf("svr4 ELF exec handler removed\n");
298		svr4_sockcache_destroy();
299		break;
300	default:
301		return (EOPNOTSUPP);
302		break;
303	}
304	return error;
305}
306
307static moduledata_t svr4_elf_mod = {
308	"svr4elf",
309	svr4_elf_modevent,
310	0
311};
312DECLARE_MODULE_TIED(svr4elf, svr4_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
313MODULE_VERSION(svr4elf, 1);
314