imgact_svr4.c revision 76166
1/*- 2 * Copyright (c) 1998 Mark Newton 3 * Copyright (c) 1994-1996 S�ren Schmidt 4 * All rights reserved. 5 * 6 * Based heavily on /sys/kern/imgact_aout.c which is: 7 * Copyright (c) 1993, David Greenman 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer 14 * in this position and unchanged. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote products 19 * derived from this software withough specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 * 32 * $FreeBSD: head/sys/compat/svr4/imgact_svr4.c 76166 2001-05-01 08:13:21Z markm $ 33 */ 34 35#include <sys/param.h> 36#include <sys/systm.h> 37#include <sys/exec.h> 38#include <sys/imgact.h> 39#include <sys/imgact_aout.h> 40#include <sys/kernel.h> 41#include <sys/lock.h> 42#include <sys/mman.h> 43#include <sys/mutex.h> 44#include <sys/proc.h> 45#include <sys/resourcevar.h> 46#include <sys/vnode.h> 47 48#include <vm/vm.h> 49#include <vm/vm_kern.h> 50#include <vm/vm_param.h> 51#include <vm/pmap.h> 52#include <vm/vm_map.h> 53#include <vm/vm_extern.h> 54 55#include <compat/svr4/svr4.h> 56 57static int exec_svr4_imgact __P((struct image_params *iparams)); 58 59static int 60exec_svr4_imgact(imgp) 61 struct image_params *imgp; 62{ 63 const struct exec *a_out = (const struct exec *) imgp->image_header; 64 struct vmspace *vmspace; 65 vm_offset_t vmaddr; 66 unsigned long virtual_offset, file_offset; 67 vm_offset_t buffer; 68 unsigned long bss_size; 69 int error; 70 71 if (((a_out->a_magic >> 16) & 0xff) != 0x64) 72 return -1; 73 74 /* 75 * Set file/virtual offset based on a.out variant. 76 */ 77 switch ((int)(a_out->a_magic & 0xffff)) { 78 case 0413: 79 virtual_offset = 0; 80 file_offset = 1024; 81 break; 82 case 0314: 83 virtual_offset = 4096; 84 file_offset = 0; 85 break; 86 default: 87 return (-1); 88 } 89 bss_size = round_page(a_out->a_bss); 90#ifdef DEBUG 91 printf("imgact: text: %08x, data: %08x, bss: %08x\n", a_out->a_text, a_out->a_data, bss_size); 92#endif 93 94 /* 95 * Check various fields in header for validity/bounds. 96 */ 97 if (a_out->a_entry < virtual_offset || 98 a_out->a_entry >= virtual_offset + a_out->a_text || 99 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK) 100 return (-1); 101 102 /* text + data can't exceed file size */ 103 if (a_out->a_data + a_out->a_text > imgp->attr->va_size) 104 return (EFAULT); 105 /* For p_rlimit below. */ 106 mtx_assert(&Giant, MA_OWNED); 107 /* 108 * text/data/bss must not exceed limits 109 */ 110 if (a_out->a_text > MAXTSIZ || 111 a_out->a_data + bss_size > imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur) 112 return (ENOMEM); 113 114 /* copy in arguments and/or environment from old process */ 115 error = exec_extract_strings(imgp); 116 if (error) 117 return (error); 118 119 /* 120 * Destroy old process VM and create a new one (with a new stack) 121 */ 122 exec_new_vmspace(imgp); 123 vmspace = imgp->proc->p_vmspace; 124 125 /* 126 * Check if file_offset page aligned,. 127 * Currently we cannot handle misalinged file offsets, 128 * and so we read in the entire image (what a waste). 129 */ 130 if (file_offset & PAGE_MASK) { 131#ifdef DEBUG 132 printf("imgact: Non page aligned binary %d\n", file_offset); 133#endif 134 /* 135 * Map text+data+bss read/write/execute 136 */ 137 vmaddr = virtual_offset; 138 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, 139 a_out->a_text + a_out->a_data + bss_size, FALSE, 140 VM_PROT_ALL, VM_PROT_ALL, 0); 141 if (error) 142 return error; 143 144 error = vm_mmap(kernel_map, &buffer, 145 round_page(a_out->a_text + a_out->a_data + file_offset), 146 VM_PROT_READ, VM_PROT_READ, 0, 147 (caddr_t) imgp->vp, trunc_page(file_offset)); 148 if (error) 149 return error; 150 151 error = copyout((caddr_t)(buffer + file_offset), (caddr_t)vmaddr, 152 a_out->a_text + a_out->a_data); 153 154 vm_map_remove(kernel_map, buffer, 155 buffer + round_page(a_out->a_text + a_out->a_data + file_offset)); 156 157 if (error) 158 return error; 159 160 /* 161 * remove write enable on the 'text' part 162 */ 163 error = vm_map_protect(&vmspace->vm_map, 164 vmaddr, 165 vmaddr + a_out->a_text, 166 VM_PROT_EXECUTE|VM_PROT_READ, 167 TRUE); 168 if (error) 169 return error; 170 } 171 else { 172#ifdef DEBUG 173 printf("imgact: Page aligned binary %d\n", file_offset); 174#endif 175 /* 176 * Map text+data read/execute 177 */ 178 vmaddr = virtual_offset; 179 error = vm_mmap(&vmspace->vm_map, &vmaddr, 180 a_out->a_text + a_out->a_data, 181 VM_PROT_READ | VM_PROT_EXECUTE, 182 VM_PROT_ALL, 183 MAP_PRIVATE | MAP_FIXED, 184 (caddr_t)imgp->vp, file_offset); 185 if (error) 186 return (error); 187 188#ifdef DEBUG 189 printf("imgact: startaddr=%08x, length=%08x\n", vmaddr, a_out->a_text + a_out->a_data); 190#endif 191 /* 192 * allow read/write of data 193 */ 194 error = vm_map_protect(&vmspace->vm_map, 195 vmaddr + a_out->a_text, 196 vmaddr + a_out->a_text + a_out->a_data, 197 VM_PROT_ALL, 198 FALSE); 199 if (error) 200 return (error); 201 202 /* 203 * Allocate anon demand-zeroed area for uninitialized data 204 */ 205 if (bss_size != 0) { 206 vmaddr = virtual_offset + a_out->a_text + a_out->a_data; 207 error = vm_map_find(&vmspace->vm_map, NULL, 0, &vmaddr, 208 bss_size, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0); 209 if (error) 210 return (error); 211#ifdef DEBUG 212 printf("imgact: bssaddr=%08x, length=%08x\n", vmaddr, bss_size); 213#endif 214 215 } 216 /* Indicate that this file should not be modified */ 217 imgp->vp->v_flag |= VTEXT; 218 } 219 /* Fill in process VM information */ 220 vmspace->vm_tsize = round_page(a_out->a_text) >> PAGE_SHIFT; 221 vmspace->vm_dsize = round_page(a_out->a_data + bss_size) >> PAGE_SHIFT; 222 vmspace->vm_taddr = (caddr_t)virtual_offset; 223 vmspace->vm_daddr = (caddr_t)virtual_offset + a_out->a_text; 224 225 /* Fill in image_params */ 226 imgp->interpreted = 0; 227 imgp->entry_addr = a_out->a_entry; 228 229 imgp->proc->p_sysent = &svr4_sysvec; 230 return (0); 231} 232 233/* 234 * Tell kern_execve.c about it, with a little help from the linker. 235 */ 236struct execsw svr4_execsw = { exec_svr4_imgact, "svr4 ELF" }; 237EXEC_SET(execsw_set, svr4_execsw); 238 239