1 /* $NetBSD: freebsd_exec_elf32.c,v 1.2 2001/07/14 02:05:05 christos 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 <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/proc.h> 36 #include <sys/malloc.h> 37 #include <sys/vnode.h> 38 #include <sys/exec.h> 39 #ifndef ELFSIZE 40 # define ELFSIZE 32 41 #endif /* !ELFSIZE */ 42 #include <sys/exec_elf.h> 43 44 #include <machine/freebsd_machdep.h> 45 46 #include <compat/freebsd/freebsd_exec.h> 47 #include <compat/common/compat_util.h> 48 49 int 50 ELFNAME2(freebsd,probe)(p, epp, veh, itp, pos) 51 struct proc *p; 52 struct exec_package *epp; 53 void *veh; 54 char *itp; 55 vaddr_t *pos; 56 { 57 int error; 58 size_t i; 59 size_t phsize; 60 Elf_Ehdr *eh = (Elf_Ehdr *) veh; 61 Elf_Phdr *ph; 62 Elf_Phdr *ephp; 63 Elf_Nhdr *np; 64 const char *bp; 65 66 static const char wantBrand[] = FREEBSD_ELF_BRAND_STRING; 67 static const char wantInterp[] = FREEBSD_ELF_INTERP_PREFIX_STRING; 68 69 /* Insist that the executable have a brand, and that it be "FreeBSD" */ 70 #ifndef EI_BRAND 71 #define EI_BRAND 8 72 #endif 73 if (eh->e_ident[EI_BRAND] == '\0' 74 || strcmp(&eh->e_ident[EI_BRAND], wantBrand)) 75 return ENOEXEC; 76 77 i = eh->e_phnum; 78 if (i != 0) { 79 phsize = i * sizeof(Elf_Phdr); 80 ph = (Elf_Phdr *) malloc(phsize, M_TEMP, M_WAITOK); 81 if ((error = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph, 82 phsize)) != 0) 83 goto bad1; 84 85 for (ephp = ph; i--; ephp++) { 86 if (ephp->p_type != PT_INTERP) 87 continue; 88 89 /* Check for "legal" intepreter name. */ 90 if (ephp->p_filesz < sizeof wantInterp) 91 goto bad1; 92 93 np = (Elf_Nhdr *) malloc(ephp->p_filesz+1, 94 M_TEMP, M_WAITOK); 95 96 if (((error = exec_read_from(p, epp->ep_vp, 97 ephp->p_offset, np, ephp->p_filesz)) != 0)) 98 goto bad2; 99 100 if (strncmp((char *)np, wantInterp, 101 sizeof wantInterp - 1)) 102 goto bad2; 103 104 free(np, M_TEMP); 105 break; 106 } 107 free(ph, M_TEMP); 108 } 109 110 if (itp[0]) { 111 if ((error = emul_find(p, NULL, epp->ep_esch->es_emul->e_path, 112 itp, &bp, 0))) 113 return error; 114 if ((error = copystr(bp, itp, MAXPATHLEN, &i)) != 0) 115 return error; 116 free((void *)bp, M_TEMP); 117 } 118 *pos = ELF_NO_ADDR; 119 #ifdef DEBUG_FREEBSD_ELF 120 printf("freebsd_elf32_probe: returning 0\n"); 121 #endif 122 return 0; 123 124 bad2: 125 free(np, M_TEMP); 126 bad1: 127 free(ph, M_TEMP); 128 return ENOEXEC; 129 } 130