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 * $FreeBSD$ 27 */ 28 29 #include <sys/param.h> 30 #include <sys/resourcevar.h> 31 #include <sys/exec.h> 32 #include <sys/fcntl.h> 33 #include <sys/imgact.h> 34 #include <sys/imgact_aout.h> 35 #include <sys/kernel.h> 36 #include <sys/namei.h> 37 #include <sys/pioctl.h> 38 #include <sys/proc.h> 39 #include <sys/signalvar.h> 40 #include <sys/stat.h> 41 #include <sys/sysent.h> 42 #include <sys/syscall.h> 43 #include <sys/vnode.h> 44 #include <sys/systm.h> 45 #include <machine/md_var.h> 46 47 #include <vm/vm.h> 48 #include <vm/vm_param.h> 49 #include <sys/lock.h> 50 #include <vm/pmap.h> 51 #include <vm/vm_map.h> 52 #include <vm/vm_object.h> 53 #include <sys/user.h> 54 55 static int exec_aout_imgact __P((struct image_params *imgp)); 56 57 struct sysentvec aout_sysvec = { 58 SYS_MAXSYSCALL, 59 sysent, 60 0, 61 0, 62 0, 63 0, 64 0, 65 0, 66 0, 67 sendsig, 68 sigcode, 69 &szsigcode, 70 0, 71 "FreeBSD a.out", 72 aout_coredump 73 }; 74 75 static int 76 exec_aout_imgact(imgp) 77 struct image_params *imgp; 78 { 79 const struct exec *a_out = (const struct exec *) imgp->image_header; 80 struct vmspace *vmspace; 81 struct vnode *vp; 82 vm_map_t map; 83 vm_object_t object; 84 vm_offset_t text_end, data_end; 85 unsigned long virtual_offset; 86 unsigned long file_offset; 87 unsigned long bss_size; 88 int error; 89 90 /* 91 * Linux and *BSD binaries look very much alike, 92 * only the machine id is different: 93 * 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI. 94 * NetBSD is in network byte order.. ugh. 95 */ 96 if (((a_out->a_magic >> 16) & 0xff) != 0x86 && 97 ((a_out->a_magic >> 16) & 0xff) != 0 && 98 ((((int)ntohl(a_out->a_magic)) >> 16) & 0xff) != 0x86) 99 return -1; 100 101 /* 102 * Set file/virtual offset based on a.out variant. 103 * We do two cases: host byte order and network byte order 104 * (for NetBSD compatibility) 105 */ 106 switch ((int)(a_out->a_magic & 0xffff)) { 107 case ZMAGIC: 108 virtual_offset = 0; 109 if (a_out->a_text) { 110 file_offset = PAGE_SIZE; 111 } else { 112 /* Bill's "screwball mode" */ 113 file_offset = 0; 114 } 115 break; 116 case QMAGIC: 117 virtual_offset = PAGE_SIZE; 118 file_offset = 0; 119 /* Pass PS_STRINGS for BSD/OS binaries only. */ 120 if (N_GETMID(*a_out) == MID_ZERO) 121 imgp->ps_strings = PS_STRINGS; 122 break; 123 default: 124 /* NetBSD compatibility */ 125 switch ((int)(ntohl(a_out->a_magic) & 0xffff)) { 126 case ZMAGIC: 127 case QMAGIC: 128 virtual_offset = PAGE_SIZE; 129 file_offset = 0; 130 break; 131 default: 132 return (-1); 133 } 134 } 135 136 bss_size = roundup(a_out->a_bss, PAGE_SIZE); 137 138 /* 139 * Check various fields in header for validity/bounds. 140 */ 141 if (/* entry point must lay with text region */ 142 a_out->a_entry < virtual_offset || 143 a_out->a_entry >= virtual_offset + a_out->a_text || 144 145 /* text and data size must each be page rounded */ 146 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK) 147 return (-1); 148 149 /* text + data can't exceed file size */ 150 if (a_out->a_data + a_out->a_text > imgp->attr->va_size) 151 return (EFAULT); 152 153 /* 154 * text/data/bss must not exceed limits 155 */ 156 if (/* text can't exceed maximum text size */ 157 a_out->a_text > MAXTSIZ || 158 159 /* data + bss can't exceed rlimit */ 160 a_out->a_data + bss_size > 161 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur) 162 return (ENOMEM); 163 164 /* copy in arguments and/or environment from old process */ 165 error = exec_extract_strings(imgp); 166 if (error) 167 return (error); 168 169 /* 170 * Destroy old process VM and create a new one (with a new stack) 171 */ 172 exec_new_vmspace(imgp); 173 174 /* 175 * The vm space can be changed by exec_new_vmspace 176 */ 177 vmspace = imgp->proc->p_vmspace; 178 179 vp = imgp->vp; 180 map = &vmspace->vm_map; 181 vm_map_lock(map); 182 object = vp->v_object; 183 vm_object_reference(object); 184 185 text_end = virtual_offset + a_out->a_text; 186 error = vm_map_insert(map, object, 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); 193 return (error); 194 } 195 data_end = text_end + a_out->a_data; 196 if (a_out->a_data) { 197 vm_object_reference(object); 198 error = vm_map_insert(map, object, 199 file_offset + a_out->a_text, 200 text_end, data_end, 201 VM_PROT_ALL, VM_PROT_ALL, 202 MAP_COPY_ON_WRITE | MAP_PREFAULT); 203 if (error) { 204 vm_map_unlock(map); 205 return (error); 206 } 207 } 208 209 if (bss_size) { 210 error = vm_map_insert(map, NULL, 0, 211 data_end, data_end + bss_size, 212 VM_PROT_ALL, VM_PROT_ALL, 0); 213 if (error) { 214 vm_map_unlock(map); 215 return (error); 216 } 217 } 218 vm_map_unlock(map); 219 220 /* Fill in process VM information */ 221 vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT; 222 vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT; 223 vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset; 224 vmspace->vm_daddr = (caddr_t) (uintptr_t) 225 (virtual_offset + a_out->a_text); 226 227 /* Fill in image_params */ 228 imgp->interpreted = 0; 229 imgp->entry_addr = a_out->a_entry; 230 231 imgp->proc->p_sysent = &aout_sysvec; 232 233 /* Indicate that this file should not be modified */ 234 imgp->vp->v_flag |= VTEXT; 235 236 return (0); 237 } 238 239 /* 240 * Dump core, into a file named as described in the comments for 241 * expand_name(), unless the process was setuid/setgid. 242 */ 243 int 244 aout_coredump(p, vp, limit) 245 register struct proc *p; 246 register struct vnode *vp; 247 off_t limit; 248 { 249 register struct ucred *cred = p->p_ucred; 250 register struct vmspace *vm = p->p_vmspace; 251 int error; 252 253 if (ctob(UPAGES + vm->vm_dsize + vm->vm_ssize) >= limit) 254 return (EFAULT); 255 bcopy(p, &p->p_addr->u_kproc.kp_proc, sizeof(struct proc)); 256 fill_eproc(p, &p->p_addr->u_kproc.kp_eproc); 257 error = cpu_coredump(p, vp, cred); 258 if (error == 0) 259 error = vn_rdwr(UIO_WRITE, vp, vm->vm_daddr, 260 (int)ctob(vm->vm_dsize), (off_t)ctob(UPAGES), UIO_USERSPACE, 261 IO_NODELOCKED|IO_UNIT, cred, (int *) NULL, p); 262 if (error == 0) 263 error = vn_rdwr(UIO_WRITE, vp, 264 (caddr_t) trunc_page(USRSTACK - ctob(vm->vm_ssize)), 265 round_page(ctob(vm->vm_ssize)), 266 (off_t)ctob(UPAGES) + ctob(vm->vm_dsize), UIO_USERSPACE, 267 IO_NODELOCKED|IO_UNIT, cred, (int *) NULL, p); 268 return (error); 269 } 270 271 /* 272 * Tell kern_execve.c about it, with a little help from the linker. 273 */ 274 static struct execsw aout_execsw = { exec_aout_imgact, "a.out" }; 275 EXEC_SET(aout, aout_execsw); 276