linux_exec_elf32.c revision 1.33
1 /* $NetBSD: linux_exec_elf32.c,v 1.33 1998/10/03 20:28:03 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Eric Haszlakiewicz. 9 * 10 * This code is derived from software contributed to The NetBSD Foundation 11 * by Christos Zoulas. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgement: 23 * This product includes software developed by the NetBSD 24 * Foundation, Inc. and its contributors. 25 * 4. Neither the name of The NetBSD Foundation nor the names of its 26 * contributors may be used to endorse or promote products derived 27 * from this software without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 30 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 31 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 32 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 33 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 34 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 35 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 36 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 37 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 38 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 39 * POSSIBILITY OF SUCH DAMAGE. 40 */ 41 42 /* 43 * Copyright (c) 1995 Frank van der Linden 44 * All rights reserved. 45 * 46 * Redistribution and use in source and binary forms, with or without 47 * modification, are permitted provided that the following conditions 48 * are met: 49 * 1. Redistributions of source code must retain the above copyright 50 * notice, this list of conditions and the following disclaimer. 51 * 2. Redistributions in binary form must reproduce the above copyright 52 * notice, this list of conditions and the following disclaimer in the 53 * documentation and/or other materials provided with the distribution. 54 * 3. The name of the author may not be used to endorse or promote products 55 * derived from this software without specific prior written permission 56 * 57 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 58 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 59 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 60 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 61 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 62 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 63 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 64 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 65 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 66 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 67 * 68 * based on exec_aout.c, sunos_exec.c and svr4_exec.c 69 */ 70 71 #ifndef ELFSIZE 72 #define ELFSIZE 32 /* XXX should die */ 73 #endif 74 75 #include <sys/param.h> 76 #include <sys/systm.h> 77 #include <sys/kernel.h> 78 #include <sys/proc.h> 79 #include <sys/malloc.h> 80 #include <sys/namei.h> 81 #include <sys/vnode.h> 82 #include <sys/mount.h> 83 #include <sys/exec.h> 84 #include <sys/exec_elf.h> 85 86 #include <sys/mman.h> 87 #include <sys/syscallargs.h> 88 89 #include <vm/vm.h> 90 #include <vm/vm_param.h> 91 #include <vm/vm_map.h> 92 93 #include <machine/cpu.h> 94 #include <machine/reg.h> 95 96 #include <compat/linux/common/linux_types.h> 97 #include <compat/linux/common/linux_signal.h> 98 #include <compat/linux/common/linux_siginfo.h> 99 #include <compat/linux/common/linux_util.h> 100 #include <compat/linux/common/linux_exec.h> 101 #include <compat/linux/common/linux_machdep.h> 102 103 #include <compat/linux/linux_syscallargs.h> 104 #include <compat/linux/linux_syscall.h> 105 106 static int ELFNAME2(linux,signature) __P((struct proc *, struct exec_package *, 107 Elf_Ehdr *)); 108 #ifdef LINUX_GCC_SIGNATURE 109 static int ELFNAME2(linux,gcc_signature) __P((struct proc *p, 110 struct exec_package *, Elf_Ehdr *)); 111 #endif 112 113 #define LINUX_ELF_AUX_ARGSIZ (sizeof(AuxInfo) * 8 / sizeof(char *)) 114 115 116 extern int linux_error[]; 117 extern char linux_sigcode[], linux_esigcode[]; 118 extern struct sysent linux_sysent[]; 119 extern char *linux_syscallnames[]; 120 121 struct emul ELFNAMEEND(emul_linux) = { 122 "linux", 123 linux_error, 124 linux_sendsig, 125 LINUX_SYS_syscall, 126 LINUX_SYS_MAXSYSCALL, 127 linux_sysent, 128 linux_syscallnames, 129 LINUX_ELF_AUX_ARGSIZ, 130 ELFNAME(copyargs), 131 linux_setregs, 132 linux_sigcode, 133 linux_esigcode, 134 }; 135 136 137 #ifdef LINUX_GCC_SIGNATURE 138 /* 139 * Take advantage of the fact that all the linux binaries are compiled 140 * with gcc, and gcc sticks in the comment field a signature. Note that 141 * on SVR4 binaries, the gcc signature will follow the OS name signature, 142 * that will not be a problem. We don't bother to read in the string table, 143 * but we check all the progbits headers. 144 * 145 * XXX This only works in the i386. On the alpha (at least) 146 * XXX we have the same gcc signature which incorrectly identifies 147 * XXX NetBSD binaries as Linux. 148 */ 149 static int 150 ELFNAME2(linux,gcc_signature)(p, epp, eh) 151 struct proc *p; 152 struct exec_package *epp; 153 Elf_Ehdr *eh; 154 { 155 size_t shsize = sizeof(Elf_Shdr) * eh->e_shnum; 156 size_t i; 157 static const char signature[] = "\0GCC: (GNU) "; 158 char buf[sizeof(signature) - 1]; 159 Elf_Shdr *sh; 160 int error; 161 162 error = ENOEXEC; 163 sh = (Elf_Shdr *) malloc(shsize, M_TEMP, M_WAITOK); 164 165 if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_shoff, 166 (caddr_t) sh, shsize)) != 0) 167 goto out; 168 169 for (i = 0; i < eh->e_shnum; i++) { 170 Elf_Shdr *s = &sh[i]; 171 172 /* 173 * Identify candidates for the comment header; 174 * Header cannot have a load address, or flags and 175 * it must be large enough. 176 */ 177 if (s->sh_type != Elf_sht_progbits || 178 s->sh_addr != 0 || 179 s->sh_flags != 0 || 180 s->sh_size < sizeof(signature) - 1) 181 continue; 182 183 if ((error = ELFNAME(read_from)(p, epp->ep_vp, s->sh_offset, 184 (caddr_t) buf, sizeof(signature) - 1)) != 0) 185 goto out; 186 187 /* 188 * error is 0, if the signatures match we are done. 189 */ 190 if (memcmp(buf, signature, sizeof(signature) - 1) == 0) 191 goto out; 192 } 193 194 out: 195 free(sh, M_TEMP); 196 return error; 197 } 198 #endif 199 200 static int 201 ELFNAME2(linux,signature)(p, epp, eh) 202 struct proc *p; 203 struct exec_package *epp; 204 Elf_Ehdr *eh; 205 { 206 size_t i; 207 Elf_Phdr *ph; 208 Elf_Note *notep; 209 char *testp; 210 size_t phsize; 211 int error = ENOEXEC; 212 213 phsize = eh->e_phnum * sizeof(Elf_Phdr); 214 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 215 if ((error = ELFNAME(read_from)(p, epp->ep_vp, eh->e_phoff, 216 (caddr_t) ph, phsize)) != 0) 217 goto out1; 218 219 for (i = 0; i < eh->e_phnum; i++) { 220 Elf_Phdr *ephp = &ph[i]; 221 u_int32_t ostype; 222 223 if (ephp->p_type != Elf_pt_interp /* XAX pt_note */ 224 #if 0 225 || ephp->p_flags != 0 226 || ephp->p_filesz < sizeof(Elf_Note)) 227 #endif 228 ) 229 continue; 230 231 notep = (Elf_Note *)malloc(ephp->p_filesz, M_TEMP, M_WAITOK); 232 if ((error = ELFNAME(read_from)(p, epp->ep_vp, ephp->p_offset, 233 (caddr_t)notep, ephp->p_filesz)) != 0) 234 goto out3; 235 236 testp = (char *)notep; 237 testp[16] = '\0'; 238 if (strncmp(&testp[8], "linux", 5) != 0) { 239 error = 0; 240 goto out3; 241 } 242 243 goto out2; 244 245 /* XXX XAX Should handle NETBSD_TYPE_EMULNAME */ 246 if (notep->type != ELF_NOTE_TYPE_OSVERSION) { 247 free(notep, M_TEMP); 248 continue; 249 } 250 251 /* Check the name and description sizes. */ 252 if (notep->namesz != ELF_NOTE_GNU_NAMESZ || 253 notep->descsz != ELF_NOTE_GNU_DESCSZ) 254 goto out2; 255 256 /* Is the name "GNU\0"? */ 257 if (memcmp((notep + sizeof(Elf_Note)), 258 ELF_NOTE_GNU_NAME, ELF_NOTE_GNU_NAMESZ)) 259 goto out2; 260 261 /* Make sure the OS is Linux */ 262 ostype = (u_int32_t)(*((u_int32_t *)notep + sizeof(Elf_Note) + 263 notep->namesz)) & ELF_NOTE_GNU_OSMASK; 264 if (ostype != ELF_NOTE_GNU_OSLINUX) 265 goto out2; 266 267 /* All checks succeeded. */ 268 error = 0; 269 goto out3; 270 } 271 272 error = ENOEXEC; 273 274 out1: 275 free(ph, M_TEMP); 276 return error; 277 278 out2: 279 error = ENOEXEC; 280 out3: 281 free(notep, M_TEMP); 282 free(ph, M_TEMP); 283 return error; 284 } 285 286 int 287 ELFNAME2(linux,probe)(p, epp, eh, itp, pos) 288 struct proc *p; 289 struct exec_package *epp; 290 Elf_Ehdr *eh; 291 char *itp; 292 Elf_Addr *pos; 293 { 294 char *bp; 295 int error; 296 size_t len; 297 298 if ((error = ELFNAME2(linux,signature)(p, epp, eh)) != 0) 299 #ifdef LINUX_GCC_SIGNATURE 300 if ((error = ELFNAME2(linux,gcc_signature)(p, epp, eh)) != 0) 301 return error; 302 #else 303 return error; 304 #endif 305 306 if (itp[0]) { 307 if ((error = emul_find(p, NULL, linux_emul_path, itp, &bp, 0))) 308 return error; 309 if ((error = copystr(bp, itp, MAXPATHLEN, &len))) 310 return error; 311 free(bp, M_TEMP); 312 } 313 epp->ep_emul = &ELFNAMEEND(emul_linux); 314 *pos = ELF_NO_ADDR; 315 return 0; 316 } 317 318
Indexes created Mon Sep 22 05:09:51 GMT 2025