1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2002 Doug Rabson 5 * Copyright (c) 2003 Peter Wemm 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 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 #include <machine/frame.h> 73 #include <machine/md_var.h> 74 #include <machine/pcb.h> 75 #include <machine/cpufunc.h> 76 77 CTASSERT(sizeof(struct ia32_mcontext) == 640); 78 CTASSERT(sizeof(struct ia32_ucontext) == 704); 79 CTASSERT(sizeof(struct ia32_sigframe) == 800); 80 CTASSERT(sizeof(struct siginfo32) == 64); 81 #ifdef COMPAT_FREEBSD4 82 CTASSERT(sizeof(struct ia32_mcontext4) == 260); 83 CTASSERT(sizeof(struct ia32_ucontext4) == 324); 84 CTASSERT(sizeof(struct ia32_sigframe4) == 408); 85 #endif 86 87 extern const char *freebsd32_syscallnames[]; 88 89 static SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 90 "ia32 mode"); 91 92 static u_long ia32_maxdsiz = IA32_MAXDSIZ; 93 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RWTUN, &ia32_maxdsiz, 0, ""); 94 u_long ia32_maxssiz = IA32_MAXSSIZ; 95 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RWTUN, &ia32_maxssiz, 0, ""); 96 static u_long ia32_maxvmem = IA32_MAXVMEM; 97 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RWTUN, &ia32_maxvmem, 0, ""); 98 99 struct sysentvec ia32_freebsd_sysvec = { 100 .sv_size = FREEBSD32_SYS_MAXSYSCALL, 101 .sv_table = freebsd32_sysent, 102 .sv_errsize = 0, 103 .sv_errtbl = NULL, 104 .sv_transtrap = NULL, 105 .sv_fixup = elf32_freebsd_fixup, 106 .sv_sendsig = ia32_sendsig, 107 .sv_sigcode = ia32_sigcode, 108 .sv_szsigcode = &sz_ia32_sigcode, 109 .sv_name = "FreeBSD ELF32", 110 .sv_coredump = elf32_coredump, 111 .sv_imgact_try = NULL, 112 .sv_minsigstksz = MINSIGSTKSZ, 113 .sv_minuser = FREEBSD32_MINUSER, 114 .sv_maxuser = FREEBSD32_MAXUSER, 115 .sv_usrstack = FREEBSD32_USRSTACK, 116 .sv_psstrings = FREEBSD32_PS_STRINGS, 117 .sv_stackprot = VM_PROT_ALL, 118 .sv_copyout_auxargs = elf32_freebsd_copyout_auxargs, 119 .sv_copyout_strings = freebsd32_copyout_strings, 120 .sv_setregs = ia32_setregs, 121 .sv_fixlimit = ia32_fixlimit, 122 .sv_maxssiz = &ia32_maxssiz, 123 .sv_flags = SV_ABI_FREEBSD | SV_ASLR | SV_IA32 | SV_ILP32 | 124 SV_SHP | SV_TIMEKEEP, 125 .sv_set_syscall_retval = ia32_set_syscall_retval, 126 .sv_fetch_syscall_args = ia32_fetch_syscall_args, 127 .sv_syscallnames = freebsd32_syscallnames, 128 .sv_shared_page_base = FREEBSD32_SHAREDPAGE, 129 .sv_shared_page_len = PAGE_SIZE, 130 .sv_schedtail = NULL, 131 .sv_thread_detach = NULL, 132 .sv_trap = NULL, 133 .sv_stackgap = elf32_stackgap, 134 }; 135 INIT_SYSENTVEC(elf_ia32_sysvec, &ia32_freebsd_sysvec); 136 137 static Elf32_Brandinfo ia32_brand_info = { 138 .brand = ELFOSABI_FREEBSD, 139 .machine = EM_386, 140 .compat_3_brand = "FreeBSD", 141 .emul_path = NULL, 142 .interp_path = "/libexec/ld-elf.so.1", 143 .sysvec = &ia32_freebsd_sysvec, 144 .interp_newpath = "/libexec/ld-elf32.so.1", 145 .brand_note = &elf32_freebsd_brandnote, 146 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 147 }; 148 149 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_MIDDLE, 150 (sysinit_cfunc_t) elf32_insert_brand_entry, 151 &ia32_brand_info); 152 153 static Elf32_Brandinfo ia32_brand_oinfo = { 154 .brand = ELFOSABI_FREEBSD, 155 .machine = EM_386, 156 .compat_3_brand = "FreeBSD", 157 .emul_path = NULL, 158 .interp_path = "/usr/libexec/ld-elf.so.1", 159 .sysvec = &ia32_freebsd_sysvec, 160 .interp_newpath = "/libexec/ld-elf32.so.1", 161 .brand_note = &elf32_freebsd_brandnote, 162 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 163 }; 164 165 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY, 166 (sysinit_cfunc_t) elf32_insert_brand_entry, 167 &ia32_brand_oinfo); 168 169 static Elf32_Brandinfo kia32_brand_info = { 170 .brand = ELFOSABI_FREEBSD, 171 .machine = EM_386, 172 .compat_3_brand = "FreeBSD", 173 .emul_path = NULL, 174 .interp_path = "/lib/ld.so.1", 175 .sysvec = &ia32_freebsd_sysvec, 176 .brand_note = &elf32_kfreebsd_brandnote, 177 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY 178 }; 179 180 SYSINIT(kia32, SI_SUB_EXEC, SI_ORDER_ANY, 181 (sysinit_cfunc_t) elf32_insert_brand_entry, 182 &kia32_brand_info); 183 184 void 185 elf32_dump_thread(struct thread *td, void *dst, size_t *off) 186 { 187 void *buf; 188 size_t len; 189 190 len = 0; 191 if (use_xsave) { 192 if (dst != NULL) { 193 fpugetregs(td); 194 len += elf32_populate_note(NT_X86_XSTATE, 195 get_pcb_user_save_td(td), dst, 196 cpu_max_ext_state_size, &buf); 197 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) = 198 xsave_mask; 199 } else 200 len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL, 201 cpu_max_ext_state_size, NULL); 202 } 203 *off = len; 204 } 205 206 void 207 ia32_fixlimit(struct rlimit *rl, int which) 208 { 209 210 switch (which) { 211 case RLIMIT_DATA: 212 if (ia32_maxdsiz != 0) { 213 if (rl->rlim_cur > ia32_maxdsiz) 214 rl->rlim_cur = ia32_maxdsiz; 215 if (rl->rlim_max > ia32_maxdsiz) 216 rl->rlim_max = ia32_maxdsiz; 217 } 218 break; 219 case RLIMIT_STACK: 220 if (ia32_maxssiz != 0) { 221 if (rl->rlim_cur > ia32_maxssiz) 222 rl->rlim_cur = ia32_maxssiz; 223 if (rl->rlim_max > ia32_maxssiz) 224 rl->rlim_max = ia32_maxssiz; 225 } 226 break; 227 case RLIMIT_VMEM: 228 if (ia32_maxvmem != 0) { 229 if (rl->rlim_cur > ia32_maxvmem) 230 rl->rlim_cur = ia32_maxvmem; 231 if (rl->rlim_max > ia32_maxvmem) 232 rl->rlim_max = ia32_maxvmem; 233 } 234 break; 235 } 236 } 237