1 /*- 2 * Copyright (c) 2002 Doug Rabson 3 * Copyright (c) 2003 Peter Wemm 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include "opt_compat.h" 32 33 #define __ELF_WORD_SIZE 32 34 35 #include <sys/param.h> 36 #include <sys/exec.h> 37 #include <sys/fcntl.h> 38 #include <sys/imgact.h> 39 #include <sys/kernel.h> 40 #include <sys/lock.h> 41 #include <sys/malloc.h> 42 #include <sys/mutex.h> 43 #include <sys/mman.h> 44 #include <sys/namei.h> 45 #include <sys/pioctl.h> 46 #include <sys/proc.h> 47 #include <sys/procfs.h> 48 #include <sys/resourcevar.h> 49 #include <sys/systm.h> 50 #include <sys/signalvar.h> 51 #include <sys/stat.h> 52 #include <sys/sx.h> 53 #include <sys/syscall.h> 54 #include <sys/sysctl.h> 55 #include <sys/sysent.h> 56 #include <sys/vnode.h> 57 #include <sys/imgact_elf.h> 58 59 #include <vm/vm.h> 60 #include <vm/vm_kern.h> 61 #include <vm/vm_param.h> 62 #include <vm/pmap.h> 63 #include <vm/vm_map.h> 64 #include <vm/vm_object.h> 65 #include <vm/vm_extern.h> 66 67 #include <compat/freebsd32/freebsd32_signal.h> 68 #include <compat/freebsd32/freebsd32_util.h> 69 #include <compat/freebsd32/freebsd32_proto.h> 70 #include <compat/freebsd32/freebsd32_syscall.h> 71 #include <compat/ia32/ia32_signal.h> 72 #ifdef __amd64__ 73 #include <machine/psl.h> 74 #include <machine/segments.h> 75 #include <machine/specialreg.h> 76 #else 77 #include <i386/include/psl.h> 78 #include <i386/include/segments.h> 79 #include <i386/include/specialreg.h> 80 #endif 81 #include <machine/frame.h> 82 #include <machine/md_var.h> 83 #include <machine/pcb.h> 84 #include <machine/cpufunc.h> 85 86 CTASSERT(sizeof(struct ia32_mcontext) == 640); 87 CTASSERT(sizeof(struct ia32_ucontext) == 704); 88 CTASSERT(sizeof(struct ia32_sigframe) == 800); 89 CTASSERT(sizeof(struct siginfo32) == 64); 90 #ifdef COMPAT_FREEBSD4 91 CTASSERT(sizeof(struct ia32_mcontext4) == 260); 92 CTASSERT(sizeof(struct ia32_ucontext4) == 324); 93 CTASSERT(sizeof(struct ia32_sigframe4) == 408); 94 #endif 95 96 static register_t *ia32_copyout_strings(struct image_params *imgp); 97 static void ia32_fixlimit(struct rlimit *rl, int which); 98 99 SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW, 0, "ia32 mode"); 100 101 static u_long ia32_maxdsiz = IA32_MAXDSIZ; 102 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RW, &ia32_maxdsiz, 0, ""); 103 TUNABLE_ULONG("compat.ia32.maxdsiz", &ia32_maxdsiz); 104 static u_long ia32_maxssiz = IA32_MAXSSIZ; 105 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RW, &ia32_maxssiz, 0, ""); 106 TUNABLE_ULONG("compat.ia32.maxssiz", &ia32_maxssiz); 107 static u_long ia32_maxvmem = IA32_MAXVMEM; 108 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RW, &ia32_maxvmem, 0, ""); 109 TUNABLE_ULONG("compat.ia32.maxvmem", &ia32_maxvmem); 110 111 struct sysentvec ia32_freebsd_sysvec = { 112 .sv_size = FREEBSD32_SYS_MAXSYSCALL, 113 .sv_table = freebsd32_sysent, 114 .sv_mask = 0, 115 .sv_sigsize = 0, 116 .sv_sigtbl = NULL, 117 .sv_errsize = 0, 118 .sv_errtbl = NULL, 119 .sv_transtrap = NULL, 120 .sv_fixup = elf32_freebsd_fixup, 121 .sv_sendsig = ia32_sendsig, 122 .sv_sigcode = ia32_sigcode, 123 .sv_szsigcode = &sz_ia32_sigcode, 124 .sv_prepsyscall = NULL, 125 .sv_name = "FreeBSD ELF32", 126 .sv_coredump = elf32_coredump, 127 .sv_imgact_try = NULL, 128 .sv_minsigstksz = MINSIGSTKSZ, 129 .sv_pagesize = IA32_PAGE_SIZE, 130 .sv_minuser = 0, 131 .sv_maxuser = FREEBSD32_USRSTACK, 132 .sv_usrstack = FREEBSD32_USRSTACK, 133 .sv_psstrings = FREEBSD32_PS_STRINGS, 134 .sv_stackprot = VM_PROT_ALL, 135 .sv_copyout_strings = ia32_copyout_strings, 136 .sv_setregs = ia32_setregs, 137 .sv_fixlimit = ia32_fixlimit, 138 .sv_maxssiz = &ia32_maxssiz, 139 .sv_flags = SV_ABI_FREEBSD | SV_IA32 | SV_ILP32 140 }; 141 142 143 static Elf32_Brandinfo ia32_brand_info = { 144 .brand = ELFOSABI_FREEBSD, 145 .machine = EM_386, 146 .compat_3_brand = "FreeBSD", 147 .emul_path = NULL, 148 .interp_path = "/libexec/ld-elf.so.1", 149 .sysvec = &ia32_freebsd_sysvec, 150 .interp_newpath = "/libexec/ld-elf32.so.1", 151 .brand_note = &elf32_freebsd_brandnote, 152 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 153 }; 154 155 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_MIDDLE, 156 (sysinit_cfunc_t) elf32_insert_brand_entry, 157 &ia32_brand_info); 158 159 static Elf32_Brandinfo ia32_brand_oinfo = { 160 .brand = ELFOSABI_FREEBSD, 161 .machine = EM_386, 162 .compat_3_brand = "FreeBSD", 163 .emul_path = NULL, 164 .interp_path = "/usr/libexec/ld-elf.so.1", 165 .sysvec = &ia32_freebsd_sysvec, 166 .interp_newpath = "/libexec/ld-elf32.so.1", 167 .brand_note = &elf32_freebsd_brandnote, 168 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 169 }; 170 171 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY, 172 (sysinit_cfunc_t) elf32_insert_brand_entry, 173 &ia32_brand_oinfo); 174 175 static Elf32_Brandinfo kia32_brand_info = { 176 .brand = ELFOSABI_FREEBSD, 177 .machine = EM_386, 178 .compat_3_brand = "FreeBSD", 179 .emul_path = NULL, 180 .interp_path = "/lib/ld.so.1", 181 .sysvec = &ia32_freebsd_sysvec, 182 .brand_note = &elf32_kfreebsd_brandnote, 183 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY 184 }; 185 186 SYSINIT(kia32, SI_SUB_EXEC, SI_ORDER_ANY, 187 (sysinit_cfunc_t) elf32_insert_brand_entry, 188 &kia32_brand_info); 189 190 191 void 192 elf32_dump_thread(struct thread *td __unused, void *dst __unused, 193 size_t *off __unused) 194 { 195 } 196 197 198 /* XXX may be freebsd32 MI */ 199 static register_t * 200 ia32_copyout_strings(struct image_params *imgp) 201 { 202 int argc, envc; 203 u_int32_t *vectp; 204 char *stringp, *destp; 205 u_int32_t *stack_base; 206 struct freebsd32_ps_strings *arginfo; 207 size_t execpath_len; 208 int szsigcode; 209 210 /* 211 * Calculate string base and vector table pointers. 212 * Also deal with signal trampoline code for this exec type. 213 */ 214 if (imgp->execpath != NULL && imgp->auxargs != NULL) 215 execpath_len = strlen(imgp->execpath) + 1; 216 else 217 execpath_len = 0; 218 arginfo = (struct freebsd32_ps_strings *)FREEBSD32_PS_STRINGS; 219 szsigcode = *(imgp->proc->p_sysent->sv_szsigcode); 220 destp = (caddr_t)arginfo - szsigcode - SPARE_USRSPACE - 221 roundup(execpath_len, sizeof(char *)) - 222 roundup((ARG_MAX - imgp->args->stringspace), sizeof(char *)); 223 224 /* 225 * install sigcode 226 */ 227 if (szsigcode) 228 copyout(imgp->proc->p_sysent->sv_sigcode, 229 ((caddr_t)arginfo - szsigcode), szsigcode); 230 231 /* 232 * Copy the image path for the rtld. 233 */ 234 if (execpath_len != 0) { 235 imgp->execpathp = (uintptr_t)arginfo - szsigcode - execpath_len; 236 copyout(imgp->execpath, (void *)imgp->execpathp, 237 execpath_len); 238 } 239 240 /* 241 * If we have a valid auxargs ptr, prepare some room 242 * on the stack. 243 */ 244 if (imgp->auxargs) { 245 /* 246 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 247 * lower compatibility. 248 */ 249 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size 250 : (AT_COUNT * 2); 251 /* 252 * The '+ 2' is for the null pointers at the end of each of 253 * the arg and env vector sets,and imgp->auxarg_size is room 254 * for argument of Runtime loader. 255 */ 256 vectp = (u_int32_t *) (destp - (imgp->args->argc + 257 imgp->args->envc + 2 + imgp->auxarg_size + execpath_len) * 258 sizeof(u_int32_t)); 259 } else 260 /* 261 * The '+ 2' is for the null pointers at the end of each of 262 * the arg and env vector sets 263 */ 264 vectp = (u_int32_t *) 265 (destp - (imgp->args->argc + imgp->args->envc + 2) * sizeof(u_int32_t)); 266 267 /* 268 * vectp also becomes our initial stack base 269 */ 270 stack_base = vectp; 271 272 stringp = imgp->args->begin_argv; 273 argc = imgp->args->argc; 274 envc = imgp->args->envc; 275 /* 276 * Copy out strings - arguments and environment. 277 */ 278 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 279 280 /* 281 * Fill in "ps_strings" struct for ps, w, etc. 282 */ 283 suword32(&arginfo->ps_argvstr, (u_int32_t)(intptr_t)vectp); 284 suword32(&arginfo->ps_nargvstr, argc); 285 286 /* 287 * Fill in argument portion of vector table. 288 */ 289 for (; argc > 0; --argc) { 290 suword32(vectp++, (u_int32_t)(intptr_t)destp); 291 while (*stringp++ != 0) 292 destp++; 293 destp++; 294 } 295 296 /* a null vector table pointer separates the argp's from the envp's */ 297 suword32(vectp++, 0); 298 299 suword32(&arginfo->ps_envstr, (u_int32_t)(intptr_t)vectp); 300 suword32(&arginfo->ps_nenvstr, envc); 301 302 /* 303 * Fill in environment portion of vector table. 304 */ 305 for (; envc > 0; --envc) { 306 suword32(vectp++, (u_int32_t)(intptr_t)destp); 307 while (*stringp++ != 0) 308 destp++; 309 destp++; 310 } 311 312 /* end of vector table is a null pointer */ 313 suword32(vectp, 0); 314 315 return ((register_t *)stack_base); 316 } 317 318 static void 319 ia32_fixlimit(struct rlimit *rl, int which) 320 { 321 322 switch (which) { 323 case RLIMIT_DATA: 324 if (ia32_maxdsiz != 0) { 325 if (rl->rlim_cur > ia32_maxdsiz) 326 rl->rlim_cur = ia32_maxdsiz; 327 if (rl->rlim_max > ia32_maxdsiz) 328 rl->rlim_max = ia32_maxdsiz; 329 } 330 break; 331 case RLIMIT_STACK: 332 if (ia32_maxssiz != 0) { 333 if (rl->rlim_cur > ia32_maxssiz) 334 rl->rlim_cur = ia32_maxssiz; 335 if (rl->rlim_max > ia32_maxssiz) 336 rl->rlim_max = ia32_maxssiz; 337 } 338 break; 339 case RLIMIT_VMEM: 340 if (ia32_maxvmem != 0) { 341 if (rl->rlim_cur > ia32_maxvmem) 342 rl->rlim_cur = ia32_maxvmem; 343 if (rl->rlim_max > ia32_maxvmem) 344 rl->rlim_max = ia32_maxvmem; 345 } 346 break; 347 } 348 } 349