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_fixlimits(struct proc *p); 98 99 extern struct sysent freebsd32_sysent[]; 100 101 SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW, 0, "ia32 mode"); 102 103 struct sysentvec ia32_freebsd_sysvec = { 104 FREEBSD32_SYS_MAXSYSCALL, 105 freebsd32_sysent, 106 0, 107 0, 108 NULL, 109 0, 110 NULL, 111 NULL, 112 elf32_freebsd_fixup, 113 ia32_sendsig, 114 ia32_sigcode, 115 &sz_ia32_sigcode, 116 NULL, 117 "FreeBSD ELF32", 118 elf32_coredump, 119 NULL, 120 MINSIGSTKSZ, 121 IA32_PAGE_SIZE, 122 0, 123 FREEBSD32_USRSTACK, 124 FREEBSD32_USRSTACK, 125 FREEBSD32_PS_STRINGS, 126 VM_PROT_ALL, 127 ia32_copyout_strings, 128 ia32_setregs, 129 ia32_fixlimits 130 }; 131 132 133 static Elf32_Brandinfo ia32_brand_info = { 134 ELFOSABI_FREEBSD, 135 EM_386, 136 "FreeBSD", 137 NULL, 138 "/libexec/ld-elf.so.1", 139 &ia32_freebsd_sysvec, 140 "/libexec/ld-elf32.so.1", 141 0, 142 }; 143 144 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_ANY, 145 (sysinit_cfunc_t) elf32_insert_brand_entry, 146 &ia32_brand_info); 147 148 static Elf32_Brandinfo ia32_brand_oinfo = { 149 ELFOSABI_FREEBSD, 150 EM_386, 151 "FreeBSD", 152 NULL, 153 "/usr/libexec/ld-elf.so.1", 154 &ia32_freebsd_sysvec, 155 "/libexec/ld-elf32.so.1", 156 0, 157 }; 158 159 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY, 160 (sysinit_cfunc_t) elf32_insert_brand_entry, 161 &ia32_brand_oinfo); 162 163 164 void 165 elf32_dump_thread(struct thread *td __unused, void *dst __unused, 166 size_t *off __unused) 167 { 168 } 169 170 171 /* XXX may be freebsd32 MI */ 172 static register_t * 173 ia32_copyout_strings(struct image_params *imgp) 174 { 175 int argc, envc; 176 u_int32_t *vectp; 177 char *stringp, *destp; 178 u_int32_t *stack_base; 179 struct freebsd32_ps_strings *arginfo; 180 int szsigcode; 181 182 /* 183 * Calculate string base and vector table pointers. 184 * Also deal with signal trampoline code for this exec type. 185 */ 186 arginfo = (struct freebsd32_ps_strings *)FREEBSD32_PS_STRINGS; 187 szsigcode = *(imgp->proc->p_sysent->sv_szsigcode); 188 destp = (caddr_t)arginfo - szsigcode - SPARE_USRSPACE - 189 roundup((ARG_MAX - imgp->args->stringspace), sizeof(char *)); 190 191 /* 192 * install sigcode 193 */ 194 if (szsigcode) 195 copyout(imgp->proc->p_sysent->sv_sigcode, 196 ((caddr_t)arginfo - szsigcode), szsigcode); 197 198 /* 199 * If we have a valid auxargs ptr, prepare some room 200 * on the stack. 201 */ 202 if (imgp->auxargs) { 203 /* 204 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 205 * lower compatibility. 206 */ 207 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size 208 : (AT_COUNT * 2); 209 /* 210 * The '+ 2' is for the null pointers at the end of each of 211 * the arg and env vector sets,and imgp->auxarg_size is room 212 * for argument of Runtime loader. 213 */ 214 vectp = (u_int32_t *) (destp - (imgp->args->argc + imgp->args->envc + 2 + 215 imgp->auxarg_size) * sizeof(u_int32_t)); 216 217 } else 218 /* 219 * The '+ 2' is for the null pointers at the end of each of 220 * the arg and env vector sets 221 */ 222 vectp = (u_int32_t *) 223 (destp - (imgp->args->argc + imgp->args->envc + 2) * sizeof(u_int32_t)); 224 225 /* 226 * vectp also becomes our initial stack base 227 */ 228 stack_base = vectp; 229 230 stringp = imgp->args->begin_argv; 231 argc = imgp->args->argc; 232 envc = imgp->args->envc; 233 /* 234 * Copy out strings - arguments and environment. 235 */ 236 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 237 238 /* 239 * Fill in "ps_strings" struct for ps, w, etc. 240 */ 241 suword32(&arginfo->ps_argvstr, (u_int32_t)(intptr_t)vectp); 242 suword32(&arginfo->ps_nargvstr, argc); 243 244 /* 245 * Fill in argument portion of vector table. 246 */ 247 for (; argc > 0; --argc) { 248 suword32(vectp++, (u_int32_t)(intptr_t)destp); 249 while (*stringp++ != 0) 250 destp++; 251 destp++; 252 } 253 254 /* a null vector table pointer separates the argp's from the envp's */ 255 suword32(vectp++, 0); 256 257 suword32(&arginfo->ps_envstr, (u_int32_t)(intptr_t)vectp); 258 suword32(&arginfo->ps_nenvstr, envc); 259 260 /* 261 * Fill in environment portion of vector table. 262 */ 263 for (; envc > 0; --envc) { 264 suword32(vectp++, (u_int32_t)(intptr_t)destp); 265 while (*stringp++ != 0) 266 destp++; 267 destp++; 268 } 269 270 /* end of vector table is a null pointer */ 271 suword32(vectp, 0); 272 273 return ((register_t *)stack_base); 274 } 275 276 static u_long ia32_maxdsiz = IA32_MAXDSIZ; 277 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RW, &ia32_maxdsiz, 0, ""); 278 static u_long ia32_maxssiz = IA32_MAXSSIZ; 279 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RW, &ia32_maxssiz, 0, ""); 280 static u_long ia32_maxvmem = IA32_MAXVMEM; 281 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RW, &ia32_maxvmem, 0, ""); 282 283 static void 284 ia32_fixlimits(struct proc *p) 285 { 286 struct plimit *oldlim, *newlim; 287 288 if (ia32_maxdsiz == 0 && ia32_maxssiz == 0 && ia32_maxvmem == 0) 289 return; 290 newlim = lim_alloc(); 291 PROC_LOCK(p); 292 oldlim = p->p_limit; 293 lim_copy(newlim, oldlim); 294 if (ia32_maxdsiz != 0) { 295 if (newlim->pl_rlimit[RLIMIT_DATA].rlim_cur > ia32_maxdsiz) 296 newlim->pl_rlimit[RLIMIT_DATA].rlim_cur = ia32_maxdsiz; 297 if (newlim->pl_rlimit[RLIMIT_DATA].rlim_max > ia32_maxdsiz) 298 newlim->pl_rlimit[RLIMIT_DATA].rlim_max = ia32_maxdsiz; 299 } 300 if (ia32_maxssiz != 0) { 301 if (newlim->pl_rlimit[RLIMIT_STACK].rlim_cur > ia32_maxssiz) 302 newlim->pl_rlimit[RLIMIT_STACK].rlim_cur = ia32_maxssiz; 303 if (newlim->pl_rlimit[RLIMIT_STACK].rlim_max > ia32_maxssiz) 304 newlim->pl_rlimit[RLIMIT_STACK].rlim_max = ia32_maxssiz; 305 } 306 if (ia32_maxvmem != 0) { 307 if (newlim->pl_rlimit[RLIMIT_VMEM].rlim_cur > ia32_maxvmem) 308 newlim->pl_rlimit[RLIMIT_VMEM].rlim_cur = ia32_maxvmem; 309 if (newlim->pl_rlimit[RLIMIT_VMEM].rlim_max > ia32_maxvmem) 310 newlim->pl_rlimit[RLIMIT_VMEM].rlim_max = ia32_maxvmem; 311 } 312 p->p_limit = newlim; 313 PROC_UNLOCK(p); 314 lim_free(oldlim); 315 } 316