1 /* $NetBSD: freebsd_exec_elf32.c,v 1.6 2001/11/13 02:08:07 lukem 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/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: freebsd_exec_elf32.c,v 1.6 2001/11/13 02:08:07 lukem Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/proc.h> 39 #include <sys/malloc.h> 40 #include <sys/vnode.h> 41 #include <sys/exec.h> 42 #ifndef ELFSIZE 43 # define ELFSIZE 32 44 #endif /* !ELFSIZE */ 45 #include <sys/exec_elf.h> 46 47 #include <machine/freebsd_machdep.h> 48 49 #include <compat/freebsd/freebsd_exec.h> 50 #include <compat/common/compat_util.h> 51 52 int 53 ELFNAME2(freebsd,probe)(p, epp, veh, itp, pos) 54 struct proc *p; 55 struct exec_package *epp; 56 void *veh; 57 char *itp; 58 vaddr_t *pos; 59 { 60 int error; 61 size_t i; 62 size_t phsize; 63 Elf_Ehdr *eh = (Elf_Ehdr *) veh; 64 Elf_Phdr *ph; 65 Elf_Phdr *ephp; 66 Elf_Nhdr *np; 67 const char *bp; 68 69 static const char wantBrand[] = FREEBSD_ELF_BRAND_STRING; 70 static const char wantInterp[] = FREEBSD_ELF_INTERP_PREFIX_STRING; 71 72 /* 73 * Insist that the executable have a brand, and that it be "FreeBSD". 74 * Newer FreeBSD binaries have OSABI set to ELFOSABI_FREEBSD. This 75 * is arguably broken, but they seem to think they need it, for 76 * whatever reason. 77 */ 78 #ifndef EI_BRAND 79 #define EI_BRAND 8 80 #endif 81 if ((eh->e_ident[EI_BRAND] == '\0' 82 || strcmp(&eh->e_ident[EI_BRAND], wantBrand) != 0) 83 && eh->e_ident[EI_OSABI] != ELFOSABI_FREEBSD) 84 return ENOEXEC; 85 86 i = eh->e_phnum; 87 if (i != 0) { 88 phsize = i * sizeof(Elf_Phdr); 89 ph = (Elf_Phdr *) malloc(phsize, M_TEMP, M_WAITOK); 90 if ((error = exec_read_from(p, epp->ep_vp, eh->e_phoff, ph, 91 phsize)) != 0) 92 goto bad1; 93 94 for (ephp = ph; i--; ephp++) { 95 if (ephp->p_type != PT_INTERP) 96 continue; 97 98 /* Check for "legal" intepreter name. */ 99 if (ephp->p_filesz < sizeof wantInterp) 100 goto bad1; 101 102 np = (Elf_Nhdr *) malloc(ephp->p_filesz+1, 103 M_TEMP, M_WAITOK); 104 105 if (((error = exec_read_from(p, epp->ep_vp, 106 ephp->p_offset, np, ephp->p_filesz)) != 0)) 107 goto bad2; 108 109 if (strncmp((char *)np, wantInterp, 110 sizeof wantInterp - 1)) 111 goto bad2; 112 113 free(np, M_TEMP); 114 break; 115 } 116 free(ph, M_TEMP); 117 } 118 119 if (itp[0]) { 120 if ((error = emul_find(p, NULL, epp->ep_esch->es_emul->e_path, 121 itp, &bp, 0))) 122 return error; 123 if ((error = copystr(bp, itp, MAXPATHLEN, &i)) != 0) 124 return error; 125 free((void *)bp, M_TEMP); 126 } 127 *pos = ELF_NO_ADDR; 128 #ifdef DEBUG_FREEBSD_ELF 129 printf("freebsd_elf32_probe: returning 0\n"); 130 #endif 131 return 0; 132 133 bad2: 134 free(np, M_TEMP); 135 bad1: 136 free(ph, M_TEMP); 137 return ENOEXEC; 138 } 139