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/malloc.h> 37 #include <sys/namei.h> 38 #include <sys/pioctl.h> 39 #include <sys/proc.h> 40 #include <sys/signalvar.h> 41 #include <sys/stat.h> 42 #include <sys/sysent.h> 43 #include <sys/syscall.h> 44 #include <sys/vnode.h> 45 #include <sys/systm.h> 46 #include <machine/md_var.h> 47 48 #include <vm/vm.h> 49 #include <vm/vm_param.h> 50 #include <sys/lock.h> 51 #include <vm/pmap.h> 52 #include <vm/vm_map.h> 53 #include <vm/vm_object.h> 54 #include <sys/user.h> 55 56 static int exec_aout_imgact __P((struct image_params *imgp)); 57 58 struct sysentvec aout_sysvec = { 59 SYS_MAXSYSCALL, 60 sysent, 61 0, 62 0, 63 0, 64 0, 65 0, 66 0, 67 0, 68 sendsig, 69 sigcode, 70 &szsigcode, 71 0, 72 "FreeBSD a.out", 73 aout_coredump 74 }; 75 76 static int 77 exec_aout_imgact(imgp) 78 struct image_params *imgp; 79 { 80 const struct exec *a_out = (const struct exec *) imgp->image_header; 81 struct vmspace *vmspace; 82 struct vnode *vp; 83 vm_map_t map; 84 vm_object_t object; 85 vm_offset_t text_end, data_end; 86 unsigned long virtual_offset; 87 unsigned long file_offset; 88 unsigned long bss_size; 89 int error; 90 91 /* 92 * Linux and *BSD binaries look very much alike, 93 * only the machine id is different: 94 * 0x64 for Linux, 0x86 for *BSD, 0x00 for BSDI. 95 * NetBSD is in network byte order.. ugh. 96 */ 97 if (((a_out->a_magic >> 16) & 0xff) != 0x86 && 98 ((a_out->a_magic >> 16) & 0xff) != 0 && 99 ((((int)ntohl(a_out->a_magic)) >> 16) & 0xff) != 0x86) 100 return -1; 101 102 /* 103 * Set file/virtual offset based on a.out variant. 104 * We do two cases: host byte order and network byte order 105 * (for NetBSD compatibility) 106 */ 107 switch ((int)(a_out->a_magic & 0xffff)) { 108 case ZMAGIC: 109 virtual_offset = 0; 110 if (a_out->a_text) { 111 file_offset = PAGE_SIZE; 112 } else { 113 /* Bill's "screwball mode" */ 114 file_offset = 0; 115 } 116 break; 117 case QMAGIC: 118 virtual_offset = PAGE_SIZE; 119 file_offset = 0; 120 /* Pass PS_STRINGS for BSD/OS binaries only. */ 121 if (N_GETMID(*a_out) == MID_ZERO) 122 imgp->ps_strings = PS_STRINGS; 123 break; 124 default: 125 /* NetBSD compatibility */ 126 switch ((int)(ntohl(a_out->a_magic) & 0xffff)) { 127 case ZMAGIC: 128 case QMAGIC: 129 virtual_offset = PAGE_SIZE; 130 file_offset = 0; 131 break; 132 default: 133 return (-1); 134 } 135 } 136 137 bss_size = roundup(a_out->a_bss, PAGE_SIZE); 138 139 /* 140 * Check various fields in header for validity/bounds. 141 */ 142 if (/* entry point must lay with text region */ 143 a_out->a_entry < virtual_offset || 144 a_out->a_entry >= virtual_offset + a_out->a_text || 145 146 /* text and data size must each be page rounded */ 147 a_out->a_text & PAGE_MASK || a_out->a_data & PAGE_MASK) 148 return (-1); 149 150 /* text + data can't exceed file size */ 151 if (a_out->a_data + a_out->a_text > imgp->attr->va_size) 152 return (EFAULT); 153 154 /* 155 * text/data/bss must not exceed limits 156 */ 157 if (/* text can't exceed maximum text size */ 158 a_out->a_text > MAXTSIZ || 159 160 /* data + bss can't exceed rlimit */ 161 a_out->a_data + bss_size > 162 imgp->proc->p_rlimit[RLIMIT_DATA].rlim_cur) 163 return (ENOMEM); 164 165 /* copy in arguments and/or environment from old process */ 166 error = exec_extract_strings(imgp); 167 if (error) 168 return (error); 169 170 /* 171 * Destroy old process VM and create a new one (with a new stack) 172 */ 173 exec_new_vmspace(imgp); 174 175 /* 176 * The vm space can be changed by exec_new_vmspace 177 */ 178 vmspace = imgp->proc->p_vmspace; 179 180 vp = imgp->vp; 181 map = &vmspace->vm_map; 182 vm_map_lock(map); 183 object = vp->v_object; 184 vm_object_reference(object); 185 186 text_end = virtual_offset + a_out->a_text; 187 error = vm_map_insert(map, object, 188 file_offset, 189 virtual_offset, text_end, 190 VM_PROT_READ | VM_PROT_EXECUTE, VM_PROT_ALL, 191 MAP_COPY_ON_WRITE | MAP_PREFAULT); 192 if (error) { 193 vm_map_unlock(map); 194 return (error); 195 } 196 data_end = text_end + a_out->a_data; 197 if (a_out->a_data) { 198 vm_object_reference(object); 199 error = vm_map_insert(map, object, 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); 206 return (error); 207 } 208 } 209 210 if (bss_size) { 211 error = vm_map_insert(map, NULL, 0, 212 data_end, data_end + bss_size, 213 VM_PROT_ALL, VM_PROT_ALL, 0); 214 if (error) { 215 vm_map_unlock(map); 216 return (error); 217 } 218 } 219 vm_map_unlock(map); 220 221 /* Fill in process VM information */ 222 vmspace->vm_tsize = a_out->a_text >> PAGE_SHIFT; 223 vmspace->vm_dsize = (a_out->a_data + bss_size) >> PAGE_SHIFT; 224 vmspace->vm_taddr = (caddr_t) (uintptr_t) virtual_offset; 225 vmspace->vm_daddr = (caddr_t) (uintptr_t) 226 (virtual_offset + a_out->a_text); 227 228 /* Fill in image_params */ 229 imgp->interpreted = 0; 230 imgp->entry_addr = a_out->a_entry; 231 232 imgp->proc->p_sysent = &aout_sysvec; 233 234 /* Indicate that this file should not be modified */ 235 imgp->vp->v_flag |= VTEXT; 236 237 return (0); 238 } 239 240 /* 241 * Dump core, into a file named as described in the comments for 242 * expand_name(), unless the process was setuid/setgid. 243 */ 244 int 245 aout_coredump(p, vp, limit) 246 register struct proc *p; 247 register struct vnode *vp; 248 off_t limit; 249 { 250 register struct ucred *cred = p->p_ucred; 251 register struct vmspace *vm = p->p_vmspace; 252 int error; 253 254 if (ctob(UPAGES + vm->vm_dsize + vm->vm_ssize) >= limit) 255 return (EFAULT); 256 bcopy(p, &p->p_addr->u_kproc.kp_proc, sizeof(struct proc)); 257 fill_eproc(p, &p->p_addr->u_kproc.kp_eproc); 258 error = cpu_coredump(p, vp, cred); 259 if (error == 0) 260 error = vn_rdwr(UIO_WRITE, vp, vm->vm_daddr, 261 (int)ctob(vm->vm_dsize), (off_t)ctob(UPAGES), UIO_USERSPACE, 262 IO_NODELOCKED|IO_UNIT, cred, (int *) NULL, p); 263 if (error == 0) 264 error = vn_rdwr(UIO_WRITE, vp, 265 (caddr_t) trunc_page(USRSTACK - ctob(vm->vm_ssize)), 266 round_page(ctob(vm->vm_ssize)), 267 (off_t)ctob(UPAGES) + ctob(vm->vm_dsize), UIO_USERSPACE, 268 IO_NODELOCKED|IO_UNIT, cred, (int *) NULL, p); 269 return (error); 270 } 271 272 /* 273 * Tell kern_execve.c about it, with a little help from the linker. 274 */ 275 static struct execsw aout_execsw = { exec_aout_imgact, "a.out" }; 276 EXEC_SET(aout, aout_execsw); 277