linux_exec_elf32.c revision 1.47
1 /* $NetBSD: linux_exec_elf32.c,v 1.47 2000/11/17 03:55:18 erh Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas, Frank van der Linden and Eric Haszlakiewicz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * based on exec_aout.c, sunos_exec.c and svr4_exec.c 41 */ 42 43 #ifndef ELFSIZE 44 #define ELFSIZE 32 /* XXX should die */ 45 #endif 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/kernel.h> 50 #include <sys/proc.h> 51 #include <sys/malloc.h> 52 #include <sys/namei.h> 53 #include <sys/vnode.h> 54 #include <sys/mount.h> 55 #include <sys/exec.h> 56 #include <sys/exec_elf.h> 57 58 #include <sys/mman.h> 59 #include <sys/syscallargs.h> 60 61 #include <machine/cpu.h> 62 #include <machine/reg.h> 63 64 #include <compat/linux/common/linux_types.h> 65 #include <compat/linux/common/linux_signal.h> 66 #include <compat/linux/common/linux_util.h> 67 #include <compat/linux/common/linux_exec.h> 68 #include <compat/linux/common/linux_machdep.h> 69 #include <compat/linux/common/linux_errno.h> 70 71 #include <compat/linux/linux_syscallargs.h> 72 #include <compat/linux/linux_syscall.h> 73 74 static int ELFNAME2(linux,signature) __P((struct proc *, struct exec_package *, 75 Elf_Ehdr *)); 76 #ifdef LINUX_GCC_SIGNATURE 77 static int ELFNAME2(linux,gcc_signature) __P((struct proc *p, 78 struct exec_package *, Elf_Ehdr *)); 79 #endif 80 81 extern char linux_sigcode[], linux_esigcode[]; 82 extern struct sysent linux_sysent[]; 83 extern const char * const linux_syscallnames[]; 84 85 struct emul ELFNAMEEND(emul_linux) = { 86 "linux", 87 native_to_linux_errno, 88 linux_sendsig, 89 LINUX_SYS_syscall, 90 LINUX_SYS_MAXSYSCALL, 91 linux_sysent, 92 linux_syscallnames, 93 LINUX_ELF_AUX_ARGSIZ, 94 LINUX_COPYARGS_FUNCTION, 95 linux_setregs, 96 linux_sigcode, 97 linux_esigcode, 98 }; 99 100 #ifdef LINUX_GCC_SIGNATURE 101 /* 102 * Take advantage of the fact that all the linux binaries are compiled 103 * with gcc, and gcc sticks in the comment field a signature. Note that 104 * on SVR4 binaries, the gcc signature will follow the OS name signature, 105 * that will not be a problem. We don't bother to read in the string table, 106 * but we check all the progbits headers. 107 * 108 * XXX This only works in the i386. On the alpha (at least) 109 * XXX we have the same gcc signature which incorrectly identifies 110 * XXX NetBSD binaries as Linux. 111 */ 112 static int 113 ELFNAME2(linux,gcc_signature)(p, epp, eh) 114 struct proc *p; 115 struct exec_package *epp; 116 Elf_Ehdr *eh; 117 { 118 size_t shsize = sizeof(Elf_Shdr) * eh->e_shnum; 119 size_t i; 120 static const char signature[] = "\0GCC: (GNU) "; 121 char buf[sizeof(signature) - 1]; 122 Elf_Shdr *sh; 123 int error; 124 125 error = ENOEXEC; 126 sh = (Elf_Shdr *) malloc(shsize, M_TEMP, M_WAITOK); 127 128 if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_shoff, 129 (caddr_t) sh, shsize)) != 0) 130 goto out; 131 132 for (i = 0; i < eh->e_shnum; i++) { 133 Elf_Shdr *s = &sh[i]; 134 135 /* 136 * Identify candidates for the comment header; 137 * Header cannot have a load address, or flags and 138 * it must be large enough. 139 */ 140 if (s->sh_type != SHT_PROGBITS || 141 s->sh_addr != 0 || 142 s->sh_flags != 0 || 143 s->sh_size < sizeof(signature) - 1) 144 continue; 145 146 if ((error = ELFNAME(read_from)(p, epp->ep_vp, s->sh_offset, 147 (caddr_t) buf, sizeof(signature) - 1)) != 0) 148 goto out; 149 150 /* 151 * error is 0, if the signatures match we are done. 152 */ 153 #ifdef DEBUG_LINUX 154 printf("linux_gcc_sig: sig=%s\n", buf); 155 #endif 156 if (memcmp(buf, signature, sizeof(signature) - 1) == 0) 157 goto out; 158 } 159 160 out: 161 free(sh, M_TEMP); 162 #ifdef DEBUG_LINUX 163 printf("linux_gcc_sig: returning %d\n", error); 164 #endif 165 return error; 166 } 167 #endif 168 169 static int 170 ELFNAME2(linux,signature)(p, epp, eh) 171 struct proc *p; 172 struct exec_package *epp; 173 Elf_Ehdr *eh; 174 { 175 size_t i; 176 Elf_Phdr *ph; 177 Elf_Nhdr *notep; 178 size_t phsize; 179 int error = ENOEXEC; 180 181 phsize = eh->e_phnum * sizeof(Elf_Phdr); 182 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 183 if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_phoff, 184 (caddr_t) ph, phsize)) != 0) 185 goto out1; 186 187 for (i = 0; i < eh->e_phnum; i++) { 188 Elf_Phdr *ephp = &ph[i]; 189 u_int32_t ostype; 190 191 if (ephp->p_type != PT_INTERP /* XAX PT_NOTE */ 192 #if 0 193 || ephp->p_flags != 0 194 || ephp->p_filesz < sizeof(Elf_Nhdr)) 195 #endif 196 ) 197 continue; 198 199 notep = (Elf_Nhdr *)malloc(ephp->p_filesz+1, M_TEMP, M_WAITOK); 200 if ((error = ELFNAME(read_from)(p, epp->ep_vp, ephp->p_offset, 201 (caddr_t)notep, ephp->p_filesz)) != 0) 202 goto out3; 203 204 /* Check for "linux" in the intepreter name. */ 205 if (ephp->p_filesz < 8 + 5) { 206 error = ENOEXEC; 207 goto out3; 208 } 209 #ifdef DEBUG_LINUX 210 printf("linux_signature: interp=%s\n", notep); 211 #endif 212 if (strncmp(&((char *)notep)[8], "linux", 5) == 0 || 213 strncmp((char *)notep, "/lib/ld.so.", 11) == 0) { 214 error = 0; 215 goto out3; 216 } 217 218 goto out2; 219 220 /* XXX XAX Should handle NETBSD_TYPE_EMULNAME */ 221 if (notep->n_type != ELF_NOTE_TYPE_OSVERSION) { 222 free(notep, M_TEMP); 223 continue; 224 } 225 226 /* Check the name and description sizes. */ 227 if (notep->n_namesz != ELF_NOTE_GNU_NAMESZ || 228 notep->n_descsz != ELF_NOTE_GNU_DESCSZ) 229 goto out2; 230 231 /* Is the name "GNU\0"? */ 232 if (memcmp((notep + sizeof(Elf_Nhdr)), 233 ELF_NOTE_GNU_NAME, ELF_NOTE_GNU_NAMESZ)) 234 goto out2; 235 236 /* Make sure the OS is Linux */ 237 ostype = (u_int32_t)(*((u_int32_t *)notep + sizeof(Elf_Nhdr) + 238 notep->n_namesz)) & ELF_NOTE_GNU_OSMASK; 239 if (ostype != ELF_NOTE_GNU_OSLINUX) 240 goto out2; 241 242 /* All checks succeeded. */ 243 error = 0; 244 goto out3; 245 } 246 247 error = ENOEXEC; 248 249 out1: 250 free(ph, M_TEMP); 251 #ifdef DEBUG_LINUX 252 printf("linux_signature: out1=%d\n", error); 253 #endif 254 return error; 255 256 out2: 257 error = ENOEXEC; 258 out3: 259 free(notep, M_TEMP); 260 free(ph, M_TEMP); 261 #ifdef DEBUG_LINUX 262 printf("linux_signature: out2,3=%d\n", error); 263 #endif 264 return error; 265 } 266 267 int 268 ELFNAME2(linux,probe)(p, epp, eh, itp, pos) 269 struct proc *p; 270 struct exec_package *epp; 271 Elf_Ehdr *eh; 272 char *itp; 273 Elf_Addr *pos; 274 { 275 const char *bp; 276 int error; 277 size_t len; 278 279 if ((error = ELFNAME2(linux,signature)(p, epp, eh)) != 0) 280 #ifdef LINUX_GCC_SIGNATURE 281 if ((error = ELFNAME2(linux,gcc_signature)(p, epp, eh)) != 0) 282 return error; 283 #else 284 return error; 285 #endif 286 287 if (itp[0]) { 288 if ((error = emul_find(p, NULL, linux_emul_path, itp, &bp, 0))) 289 return error; 290 if ((error = copystr(bp, itp, MAXPATHLEN, &len))) 291 return error; 292 free((void *)bp, M_TEMP); 293 } 294 epp->ep_emul = &ELFNAMEEND(emul_linux); 295 *pos = ELF_NO_ADDR; 296 #ifdef DEBUG_LINUX 297 printf("linux_probe: returning 0\n"); 298 #endif 299 return 0; 300 } 301 302
Indexes created Mon Sep 22 10:09:38 GMT 2025