The thread/proc pointer argument in the VFS subsystem originally existed
[dragonfly.git] / sys / kern / imgact_aout.c
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1/*
2 * Copyright (c) 1993, David Greenman
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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: src/sys/kern/imgact_aout.c,v 1.59.2.5 2001/11/03 01:41:08 ps Exp $
87de5057 27 * $DragonFly: src/sys/kern/imgact_aout.c,v 1.11 2006/05/06 02:43:12 dillon Exp $
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28 */
29
30#include <sys/param.h>
31#include <sys/resourcevar.h>
32#include <sys/exec.h>
33#include <sys/fcntl.h>
34#include <sys/imgact.h>
35#include <sys/imgact_aout.h>
36#include <sys/kernel.h>
37#include <sys/malloc.h>
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38#include <sys/systm.h>
39#include <sys/proc.h>
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40#include <sys/namei.h>
41#include <sys/pioctl.h>
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42#include <sys/signalvar.h>
43#include <sys/stat.h>
44#include <sys/sysent.h>
45#include <sys/syscall.h>
46#include <sys/vnode.h>
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47#include <machine/md_var.h>
48
49#include <vm/vm.h>
50#include <vm/vm_param.h>
51#include <sys/lock.h>
52#include <vm/pmap.h>
53#include <vm/vm_map.h>
54#include <vm/vm_object.h>
55#include <sys/user.h>
56
402ed7e1 57static int exec_aout_imgact (struct image_params *imgp);
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58
59struct sysentvec aout_sysvec = {
60 SYS_MAXSYSCALL,
61 sysent,
8ec60c3f 62 -1,
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63 0,
64 0,
65 0,
66 0,
67 0,
68 0,
69 sendsig,
70 sigcode,
71 &szsigcode,
72 0,
73 "FreeBSD a.out",
74 aout_coredump,
75 NULL,
76 MINSIGSTKSZ
77};
78
79static int
a108bf71 80exec_aout_imgact(struct image_params *imgp)
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81{
82 const struct exec *a_out = (const struct exec *) imgp->image_header;
83 struct vmspace *vmspace;
84 struct vnode *vp;
a108bf71 85 int count;
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86 vm_map_t map;
87 vm_object_t object;
88 vm_offset_t text_end, data_end;
89 unsigned long virtual_offset;
90 unsigned long file_offset;
91 unsigned long bss_size;
92 int error;
93
94 /*
95 * Linux and *BSD binaries look very much alike,
96 * only the machine id is different:
97 * 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI.
98 * NetBSD is in network byte order.. ugh.
99 */
100 if (((a_out->a_magic >> 16) & 0xff) != 0x86 &&
101 ((a_out->a_magic >> 16) & 0xff) != 0 &&
102 ((((int)ntohl(a_out->a_magic)) >> 16) & 0xff) != 0x86)
103 return -1;
104
105 /*
106 * Set file/virtual offset based on a.out variant.
107 * We do two cases: host byte order and network byte order
108 * (for NetBSD compatibility)
109 */
110 switch ((int)(a_out->a_magic & 0xffff)) {
111 case ZMAGIC:
112 virtual_offset = 0;
113 if (a_out->a_text) {
114 file_offset = PAGE_SIZE;
115 } else {
116 /* Bill's "screwball mode" */
117 file_offset = 0;
118 }
119 break;
120 case QMAGIC:
121 virtual_offset = PAGE_SIZE;
122 file_offset = 0;
123 /* Pass PS_STRINGS for BSD/OS binaries only. */
124 if (N_GETMID(*a_out) == MID_ZERO)
125 imgp->ps_strings = PS_STRINGS;
126 break;
127 default:
128 /* NetBSD compatibility */
129 switch ((int)(ntohl(a_out->a_magic) & 0xffff)) {
130 case ZMAGIC:
131 case QMAGIC:
132 virtual_offset = PAGE_SIZE;
133 file_offset = 0;
134 break;
135 default:
136 return (-1);
137 }
138 }
139
140 bss_size = roundup(a_out->a_bss, PAGE_SIZE);
141
142 /*
143 * Check various fields in header for validity/bounds.
144 */
145 if (/* entry point must lay with text region */
146 a_out->a_entry < virtual_offset ||
147 a_out->a_entry >= virtual_offset + a_out->a_text ||
148
149 /* text and data size must each be page rounded */
150 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK)
151 return (-1);
152
153 /* text + data can't exceed file size */
154 if (a_out->a_data + a_out->a_text > imgp->attr->va_size)
155 return (EFAULT);
156
157 /*
158 * text/data/bss must not exceed limits
159 */
160 if (/* text can't exceed maximum text size */
161 a_out->a_text > maxtsiz ||
162
163 /* data + bss can't exceed rlimit */
164 a_out->a_data + bss_size >
165 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur)
166 return (ENOMEM);
167
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168 /*
169 * Destroy old process VM and create a new one (with a new stack)
170 */
29802dbb 171 exec_new_vmspace(imgp, NULL);
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172
173 /*
174 * The vm space can be changed by exec_new_vmspace
175 */
176 vmspace = imgp->proc->p_vmspace;
177
178 vp = imgp->vp;
179 map = &vmspace->vm_map;
a108bf71 180 count = vm_map_entry_reserve(MAP_RESERVE_COUNT);
984263bc 181 vm_map_lock(map);
7540ab49 182 object = vp->v_object;
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183 vm_object_reference(object);
184
185 text_end = virtual_offset + a_out->a_text;
a108bf71 186 error = vm_map_insert(map, &count, object,
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187 file_offset,
188 virtual_offset, text_end,
189 VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL,
190 MAP_COPY_ON_WRITE | MAP_PREFAULT);
191 if (error) {
192 vm_map_unlock(map);
a108bf71 193 vm_map_entry_release(count);
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194 return (error);
195 }
196 data_end = text_end + a_out->a_data;
197 if (a_out->a_data) {
198 vm_object_reference(object);
a108bf71 199 error = vm_map_insert(map, &count, object,
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200 file_offset + a_out->a_text,
201 text_end, data_end,
202 VM_PROT_ALL, VM_PROT_ALL,
203 MAP_COPY_ON_WRITE | MAP_PREFAULT);
204 if (error) {
205 vm_map_unlock(map);
a108bf71 206 vm_map_entry_release(count);
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207 return (error);
208 }
209 }
210
211 if (bss_size) {
a108bf71 212 error = vm_map_insert(map, &count, NULL, 0,
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213 data_end, data_end + bss_size,
214 VM_PROT_ALL, VM_PROT_ALL, 0);
215 if (error) {
216 vm_map_unlock(map);
a108bf71 217 vm_map_entry_release(count);
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218 return (error);
219 }
220 }
221 vm_map_unlock(map);
a108bf71 222 vm_map_entry_release(count);
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223
224 /* Fill in process VM information */
225 vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT;
226 vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT;
227 vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset;
228 vmspace->vm_daddr = (caddr_t) (uintptr_t)
229 (virtual_offset + a_out->a_text);
230
231 /* Fill in image_params */
232 imgp->interpreted = 0;
233 imgp->entry_addr = a_out->a_entry;
234
235 imgp->proc->p_sysent = &aout_sysvec;
236
237 /* Indicate that this file should not be modified */
238 imgp->vp->v_flag |= VTEXT;
239
240 return (0);
241}
242
243/*
244 * Dump core, into a file named as described in the comments for
245 * expand_name(), unless the process was setuid/setgid.
246 */
247int
248aout_coredump(p, vp, limit)
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249 struct proc *p;
250 struct vnode *vp;
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251 off_t limit;
252{
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253 struct ucred *cred = p->p_ucred;
254 struct vmspace *vm = p->p_vmspace;
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255 int error;
256
257 if (ctob(UPAGES + vm->vm_dsize + vm->vm_ssize) >= limit)
258 return (EFAULT);
259 bcopy(p, &p->p_addr->u_kproc.kp_proc, sizeof(struct proc));
260 fill_eproc(p, &p->p_addr->u_kproc.kp_eproc);
dadab5e9 261 error = cpu_coredump(p->p_thread, vp, cred);
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262 if (error == 0)
263 error = vn_rdwr_inchunks(UIO_WRITE, vp, vm->vm_daddr,
264 (int)ctob(vm->vm_dsize), (off_t)ctob(UPAGES), UIO_USERSPACE,
87de5057 265 IO_UNIT | IO_DIRECT | IO_CORE, cred, (int *) NULL);
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266 if (error == 0)
267 error = vn_rdwr_inchunks(UIO_WRITE, vp,
268 (caddr_t) trunc_page(USRSTACK - ctob(vm->vm_ssize)),
269 round_page(ctob(vm->vm_ssize)),
270 (off_t)ctob(UPAGES) + ctob(vm->vm_dsize), UIO_USERSPACE,
87de5057 271 IO_UNIT | IO_DIRECT | IO_CORE, cred, (int *) NULL);
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272 return (error);
273}
274
275/*
276 * Tell kern_execve.c about it, with a little help from the linker.
277 */
278static struct execsw aout_execsw = { exec_aout_imgact, "a.out" };
279EXEC_SET(aout, aout_execsw);