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_util.h> 68 #include <compat/freebsd32/freebsd32_proto.h> 69 #include <compat/freebsd32/freebsd32_syscall.h> 70 #include <compat/ia32/ia32_signal.h> 71 #ifdef __amd64__ 72 #include <machine/psl.h> 73 #include <machine/segments.h> 74 #include <machine/specialreg.h> 75 #else 76 #include <i386/include/psl.h> 77 #include <i386/include/segments.h> 78 #include <i386/include/specialreg.h> 79 #endif 80 #include <machine/frame.h> 81 #include <machine/md_var.h> 82 #include <machine/pcb.h> 83 #include <machine/cpufunc.h> 84 85 CTASSERT(sizeof(struct ia32_mcontext) == 640); 86 CTASSERT(sizeof(struct ia32_ucontext) == 704); 87 CTASSERT(sizeof(struct ia32_sigframe) == 800); 88 CTASSERT(sizeof(struct ia32_siginfo) == 64); 89 #ifdef COMPAT_FREEBSD4 90 CTASSERT(sizeof(struct ia32_mcontext4) == 260); 91 CTASSERT(sizeof(struct ia32_ucontext4) == 324); 92 CTASSERT(sizeof(struct ia32_sigframe4) == 408); 93 #endif 94 95 static register_t *ia32_copyout_strings(struct image_params *imgp); 96 static void ia32_fixlimits(struct proc *p); 97 98 extern struct sysent freebsd32_sysent[]; 99 100 SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW, 0, "ia32 mode"); 101 102 struct sysentvec ia32_freebsd_sysvec = { 103 FREEBSD32_SYS_MAXSYSCALL, 104 freebsd32_sysent, 105 0, 106 0, 107 NULL, 108 0, 109 NULL, 110 NULL, 111 elf32_freebsd_fixup, 112 ia32_sendsig, 113 ia32_sigcode, 114 &sz_ia32_sigcode, 115 NULL, 116 "FreeBSD ELF32", 117 elf32_coredump, 118 NULL, 119 MINSIGSTKSZ, 120 IA32_PAGE_SIZE, 121 0, 122 FREEBSD32_USRSTACK, 123 FREEBSD32_USRSTACK, 124 FREEBSD32_PS_STRINGS, 125 VM_PROT_ALL, 126 ia32_copyout_strings, 127 ia32_setregs, 128 ia32_fixlimits 129 }; 130 131 132 static Elf32_Brandinfo ia32_brand_info = { 133 ELFOSABI_FREEBSD, 134 EM_386, 135 "FreeBSD", 136 NULL, 137 "/libexec/ld-elf.so.1", 138 &ia32_freebsd_sysvec, 139 "/libexec/ld-elf32.so.1", 140 0, 141 }; 142 143 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_ANY, 144 (sysinit_cfunc_t) elf32_insert_brand_entry, 145 &ia32_brand_info); 146 147 static Elf32_Brandinfo ia32_brand_oinfo = { 148 ELFOSABI_FREEBSD, 149 EM_386, 150 "FreeBSD", 151 NULL, 152 "/usr/libexec/ld-elf.so.1", 153 &ia32_freebsd_sysvec, 154 "/libexec/ld-elf32.so.1", 155 0, 156 }; 157 158 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY, 159 (sysinit_cfunc_t) elf32_insert_brand_entry, 160 &ia32_brand_oinfo); 161 162 163 void 164 elf32_dump_thread(struct thread *td __unused, void *dst __unused, 165 size_t *off __unused) 166 { 167 } 168 169 170 /* XXX may be freebsd32 MI */ 171 static register_t * 172 ia32_copyout_strings(struct image_params *imgp) 173 { 174 int argc, envc; 175 u_int32_t *vectp; 176 char *stringp, *destp; 177 u_int32_t *stack_base; 178 struct freebsd32_ps_strings *arginfo; 179 int szsigcode; 180 181 /* 182 * Calculate string base and vector table pointers. 183 * Also deal with signal trampoline code for this exec type. 184 */ 185 arginfo = (struct freebsd32_ps_strings *)FREEBSD32_PS_STRINGS; 186 szsigcode = *(imgp->proc->p_sysent->sv_szsigcode); 187 destp = (caddr_t)arginfo - szsigcode - SPARE_USRSPACE - 188 roundup((ARG_MAX - imgp->args->stringspace), sizeof(char *)); 189 190 /* 191 * install sigcode 192 */ 193 if (szsigcode) 194 copyout(imgp->proc->p_sysent->sv_sigcode, 195 ((caddr_t)arginfo - szsigcode), szsigcode); 196 197 /* 198 * If we have a valid auxargs ptr, prepare some room 199 * on the stack. 200 */ 201 if (imgp->auxargs) { 202 /* 203 * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for 204 * lower compatibility. 205 */ 206 imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size 207 : (AT_COUNT * 2); 208 /* 209 * The '+ 2' is for the null pointers at the end of each of 210 * the arg and env vector sets,and imgp->auxarg_size is room 211 * for argument of Runtime loader. 212 */ 213 vectp = (u_int32_t *) (destp - (imgp->args->argc + imgp->args->envc + 2 + 214 imgp->auxarg_size) * sizeof(u_int32_t)); 215 216 } else 217 /* 218 * The '+ 2' is for the null pointers at the end of each of 219 * the arg and env vector sets 220 */ 221 vectp = (u_int32_t *) 222 (destp - (imgp->args->argc + imgp->args->envc + 2) * sizeof(u_int32_t)); 223 224 /* 225 * vectp also becomes our initial stack base 226 */ 227 stack_base = vectp; 228 229 stringp = imgp->args->begin_argv; 230 argc = imgp->args->argc; 231 envc = imgp->args->envc; 232 /* 233 * Copy out strings - arguments and environment. 234 */ 235 copyout(stringp, destp, ARG_MAX - imgp->args->stringspace); 236 237 /* 238 * Fill in "ps_strings" struct for ps, w, etc. 239 */ 240 suword32(&arginfo->ps_argvstr, (u_int32_t)(intptr_t)vectp); 241 suword32(&arginfo->ps_nargvstr, argc); 242 243 /* 244 * Fill in argument portion of vector table. 245 */ 246 for (; argc > 0; --argc) { 247 suword32(vectp++, (u_int32_t)(intptr_t)destp); 248 while (*stringp++ != 0) 249 destp++; 250 destp++; 251 } 252 253 /* a null vector table pointer separates the argp's from the envp's */ 254 suword32(vectp++, 0); 255 256 suword32(&arginfo->ps_envstr, (u_int32_t)(intptr_t)vectp); 257 suword32(&arginfo->ps_nenvstr, envc); 258 259 /* 260 * Fill in environment portion of vector table. 261 */ 262 for (; envc > 0; --envc) { 263 suword32(vectp++, (u_int32_t)(intptr_t)destp); 264 while (*stringp++ != 0) 265 destp++; 266 destp++; 267 } 268 269 /* end of vector table is a null pointer */ 270 suword32(vectp, 0); 271 272 return ((register_t *)stack_base); 273 } 274 275 static u_long ia32_maxdsiz = IA32_MAXDSIZ; 276 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RW, &ia32_maxdsiz, 0, ""); 277 static u_long ia32_maxssiz = IA32_MAXSSIZ; 278 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RW, &ia32_maxssiz, 0, ""); 279 static u_long ia32_maxvmem = IA32_MAXVMEM; 280 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RW, &ia32_maxvmem, 0, ""); 281 282 static void 283 ia32_fixlimits(struct proc *p) 284 { 285 struct plimit *oldlim, *newlim; 286 287 if (ia32_maxdsiz == 0 && ia32_maxssiz == 0 && ia32_maxvmem == 0) 288 return; 289 newlim = lim_alloc(); 290 PROC_LOCK(p); 291 oldlim = p->p_limit; 292 lim_copy(newlim, oldlim); 293 if (ia32_maxdsiz != 0) { 294 if (newlim->pl_rlimit[RLIMIT_DATA].rlim_cur > ia32_maxdsiz) 295 newlim->pl_rlimit[RLIMIT_DATA].rlim_cur = ia32_maxdsiz; 296 if (newlim->pl_rlimit[RLIMIT_DATA].rlim_max > ia32_maxdsiz) 297 newlim->pl_rlimit[RLIMIT_DATA].rlim_max = ia32_maxdsiz; 298 } 299 if (ia32_maxssiz != 0) { 300 if (newlim->pl_rlimit[RLIMIT_STACK].rlim_cur > ia32_maxssiz) 301 newlim->pl_rlimit[RLIMIT_STACK].rlim_cur = ia32_maxssiz; 302 if (newlim->pl_rlimit[RLIMIT_STACK].rlim_max > ia32_maxssiz) 303 newlim->pl_rlimit[RLIMIT_STACK].rlim_max = ia32_maxssiz; 304 } 305 if (ia32_maxvmem != 0) { 306 if (newlim->pl_rlimit[RLIMIT_VMEM].rlim_cur > ia32_maxvmem) 307 newlim->pl_rlimit[RLIMIT_VMEM].rlim_cur = ia32_maxvmem; 308 if (newlim->pl_rlimit[RLIMIT_VMEM].rlim_max > ia32_maxvmem) 309 newlim->pl_rlimit[RLIMIT_VMEM].rlim_max = ia32_maxvmem; 310 } 311 p->p_limit = newlim; 312 PROC_UNLOCK(p); 313 lim_free(oldlim); 314 } 315