1 /* $NetBSD: freebsd_exec.c,v 1.5 1999/10/25 13:55:07 kleink Exp $ */ 2 3 /* 4 * Copyright (c) 1993, 1994 Christopher G. Demetriou 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Christopher G. Demetriou. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without 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 33 #include "opt_execfmt.h" 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/proc.h> 38 #include <sys/malloc.h> 39 #include <sys/vnode.h> 40 #include <sys/exec.h> 41 #ifdef EXEC_ELF32 42 # ifndef ELFSIZE 43 # define ELFSIZE 32 44 # endif /* !ELFSIZE */ 45 # include <sys/exec_elf.h> 46 #endif /* EXEC_ELF32 */ 47 #include <sys/resourcevar.h> 48 #include <vm/vm.h> 49 50 #include <machine/freebsd_machdep.h> 51 52 #include <compat/freebsd/freebsd_exec.h> 53 #include <compat/freebsd/freebsd_util.h> 54 55 #include <compat/freebsd/freebsd_syscall.h> 56 57 extern struct sysent freebsd_sysent[]; 58 extern char *freebsd_syscallnames[]; 59 60 #ifdef EXEC_AOUT 61 struct emul emul_freebsd_aout = { 62 "freebsd", 63 NULL, 64 freebsd_sendsig, 65 FREEBSD_SYS_syscall, 66 FREEBSD_SYS_MAXSYSCALL, 67 freebsd_sysent, 68 freebsd_syscallnames, 69 0, 70 copyargs, 71 freebsd_setregs, 72 freebsd_sigcode, 73 freebsd_esigcode, 74 }; 75 #endif /* EXEC_AOUT */ 76 77 #ifdef EXEC_ELF32 78 79 struct emul ELFNAMEEND(emul_freebsd) = { 80 "freebsd", 81 NULL, 82 freebsd_sendsig, 83 FREEBSD_SYS_syscall, 84 FREEBSD_SYS_MAXSYSCALL, 85 freebsd_sysent, 86 freebsd_syscallnames, 87 FREEBSD_ELF_AUX_ARGSIZ, 88 ELFNAME(copyargs), 89 freebsd_setregs, 90 freebsd_sigcode, 91 freebsd_esigcode, 92 }; 93 94 int 95 ELFNAME2(freebsd,probe)(p, epp, eh, itp, pos) 96 struct proc *p; 97 struct exec_package *epp; 98 Elf_Ehdr *eh; 99 char *itp; 100 Elf_Addr *pos; 101 { 102 int error; 103 size_t i; 104 size_t phsize; 105 Elf_Phdr *ph; 106 Elf_Phdr *ephp; 107 Elf_Nhdr *np; 108 const char *bp; 109 110 static const char wantBrand[] = FREEBSD_ELF_BRAND_STRING; 111 static const char wantInterp[] = FREEBSD_ELF_INTERP_PREFIX_STRING; 112 113 /* Insist that the executable have a brand, and that it be "FreeBSD" */ 114 #ifndef EI_BRAND 115 #define EI_BRAND 8 116 #endif 117 if (eh->e_ident[EI_BRAND] == '\0' 118 || strcmp(&eh->e_ident[EI_BRAND], wantBrand)) 119 return ENOEXEC; 120 121 i = eh->e_phnum; 122 if (i != 0) { 123 phsize = i * sizeof(Elf_Phdr); 124 ph = (Elf_Phdr *) malloc(phsize, M_TEMP, M_WAITOK); 125 if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_phoff, 126 (caddr_t) ph, phsize)) != 0) 127 goto bad1; 128 129 for (ephp = ph; i--; ephp++) { 130 if (ephp->p_type != PT_INTERP) 131 continue; 132 133 /* Check for "legal" intepreter name. */ 134 if (ephp->p_filesz < sizeof wantInterp) 135 goto bad1; 136 137 np = (Elf_Nhdr *) malloc(ephp->p_filesz+1, 138 M_TEMP, M_WAITOK); 139 140 if (((error = ELFNAME(read_from)(p, epp->ep_vp, 141 ephp->p_offset, (caddr_t)np, ephp->p_filesz)) != 0)) 142 goto bad2; 143 144 if (strncmp((char *)np, wantInterp, 145 sizeof wantInterp - 1)) 146 goto bad2; 147 148 free(np, M_TEMP); 149 break; 150 } 151 free(ph, M_TEMP); 152 } 153 154 if (itp[0]) { 155 if ((error = emul_find(p, NULL, freebsd_emul_path, 156 itp, &bp, 0))) 157 return error; 158 if ((error = copystr(bp, itp, MAXPATHLEN, &i)) != 0) 159 return error; 160 free((void *)bp, M_TEMP); 161 } 162 epp->ep_emul = &ELFNAMEEND(emul_freebsd); 163 *pos = ELF_NO_ADDR; 164 #ifdef DEBUG_FREEBSD_ELF 165 printf("freebsd_elf32_probe: returning 0\n"); 166 #endif 167 return 0; 168 169 bad2: 170 free(np, M_TEMP); 171 bad1: 172 free(ph, M_TEMP); 173 return ENOEXEC; 174 } 175 #endif /* EXEC_ELF32 */ 176 177 178 #ifdef EXEC_AOUT 179 /* 180 * exec_aout_makecmds(): Check if it's an a.out-format executable. 181 * 182 * Given a proc pointer and an exec package pointer, see if the referent 183 * of the epp is in a.out format. First check 'standard' magic numbers for 184 * this architecture. If that fails, try a cpu-dependent hook. 185 * 186 * This function, in the former case, or the hook, in the latter, is 187 * responsible for creating a set of vmcmds which can be used to build 188 * the process's vm space and inserting them into the exec package. 189 */ 190 191 int 192 exec_freebsd_aout_makecmds(p, epp) 193 struct proc *p; 194 struct exec_package *epp; 195 { 196 u_long midmag; 197 int error = ENOEXEC; 198 struct exec *execp = epp->ep_hdr; 199 200 if (epp->ep_hdrvalid < sizeof(struct exec)) 201 return ENOEXEC; 202 203 midmag = FREEBSD_N_GETMID(*execp) << 16 | FREEBSD_N_GETMAGIC(*execp); 204 205 /* assume FreeBSD's MID_MACHINE and [ZQNO]MAGIC is same as NetBSD's */ 206 switch (midmag) { 207 case (MID_MACHINE << 16) | ZMAGIC: 208 error = exec_aout_prep_oldzmagic(p, epp); 209 break; 210 case (MID_MACHINE << 16) | QMAGIC: 211 error = exec_aout_prep_zmagic(p, epp); 212 break; 213 case (MID_MACHINE << 16) | NMAGIC: 214 error = exec_aout_prep_nmagic(p, epp); 215 break; 216 case (MID_MACHINE << 16) | OMAGIC: 217 error = exec_aout_prep_omagic(p, epp); 218 break; 219 } 220 if (error == 0) 221 epp->ep_emul = &emul_freebsd_aout; 222 else 223 kill_vmcmds(&epp->ep_vmcmds); 224 225 return error; 226 } 227 #endif /* EXEC_AOUT */ 228