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/proc.h> 46 #include <sys/procfs.h> 47 #include <sys/resourcevar.h> 48 #include <sys/systm.h> 49 #include <sys/signalvar.h> 50 #include <sys/stat.h> 51 #include <sys/sx.h> 52 #include <sys/syscall.h> 53 #include <sys/sysctl.h> 54 #include <sys/sysent.h> 55 #include <sys/vnode.h> 56 #include <sys/imgact_elf.h> 57 58 #include <vm/vm.h> 59 #include <vm/vm_kern.h> 60 #include <vm/vm_param.h> 61 #include <vm/pmap.h> 62 #include <vm/vm_map.h> 63 #include <vm/vm_object.h> 64 #include <vm/vm_extern.h> 65 66 #include <compat/freebsd32/freebsd32_signal.h> 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 #include <machine/frame.h> 72 #include <machine/md_var.h> 73 #include <machine/pcb.h> 74 #include <machine/cpufunc.h> 75 76 CTASSERT(sizeof(struct ia32_mcontext) == 640); 77 CTASSERT(sizeof(struct ia32_ucontext) == 704); 78 CTASSERT(sizeof(struct ia32_sigframe) == 800); 79 CTASSERT(sizeof(struct siginfo32) == 64); 80 #ifdef COMPAT_FREEBSD4 81 CTASSERT(sizeof(struct ia32_freebsd4_mcontext) == 260); 82 CTASSERT(sizeof(struct ia32_freebsd4_ucontext) == 324); 83 CTASSERT(sizeof(struct ia32_freebsd4_sigframe) == 408); 84 #endif 85 86 #include "vdso_ia32_offsets.h" 87 88 extern const char _binary_elf_vdso32_so_1_start[]; 89 extern const char _binary_elf_vdso32_so_1_end[]; 90 extern char _binary_elf_vdso32_so_1_size; 91 92 extern const char *freebsd32_syscallnames[]; 93 94 static SYSCTL_NODE(_compat, OID_AUTO, ia32, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 95 "ia32 mode"); 96 97 static u_long ia32_maxdsiz = IA32_MAXDSIZ; 98 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxdsiz, CTLFLAG_RWTUN, &ia32_maxdsiz, 0, ""); 99 u_long ia32_maxssiz = IA32_MAXSSIZ; 100 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxssiz, CTLFLAG_RWTUN, &ia32_maxssiz, 0, ""); 101 static u_long ia32_maxvmem = IA32_MAXVMEM; 102 SYSCTL_ULONG(_compat_ia32, OID_AUTO, maxvmem, CTLFLAG_RWTUN, &ia32_maxvmem, 0, ""); 103 104 struct sysentvec ia32_freebsd_sysvec = { 105 .sv_size = FREEBSD32_SYS_MAXSYSCALL, 106 .sv_table = freebsd32_sysent, 107 .sv_transtrap = NULL, 108 .sv_fixup = elf32_freebsd_fixup, 109 .sv_sendsig = ia32_sendsig, 110 .sv_sigcode = _binary_elf_vdso32_so_1_start, 111 .sv_szsigcode = (int *)&_binary_elf_vdso32_so_1_size, 112 .sv_sigcodeoff = VDSO_IA32_SIGCODE_OFFSET, 113 .sv_name = "FreeBSD ELF32", 114 .sv_coredump = elf32_coredump, 115 .sv_elf_core_osabi = ELFOSABI_FREEBSD, 116 .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR, 117 .sv_elf_core_prepare_notes = elf32_prepare_notes, 118 .sv_imgact_try = NULL, 119 .sv_minsigstksz = MINSIGSTKSZ, 120 .sv_minuser = FREEBSD32_MINUSER, 121 .sv_maxuser = FREEBSD32_MAXUSER, 122 .sv_usrstack = FREEBSD32_USRSTACK, 123 .sv_psstrings = FREEBSD32_PS_STRINGS, 124 .sv_psstringssz = sizeof(struct freebsd32_ps_strings), 125 .sv_stackprot = VM_PROT_ALL, 126 .sv_copyout_auxargs = elf32_freebsd_copyout_auxargs, 127 .sv_copyout_strings = freebsd32_copyout_strings, 128 .sv_setregs = ia32_setregs, 129 .sv_fixlimit = ia32_fixlimit, 130 .sv_maxssiz = &ia32_maxssiz, 131 .sv_flags = SV_ABI_FREEBSD | SV_ASLR | SV_IA32 | SV_ILP32 | 132 SV_SHP | SV_TIMEKEEP | SV_RNG_SEED_VER | SV_DSO_SIG, 133 .sv_set_syscall_retval = ia32_set_syscall_retval, 134 .sv_fetch_syscall_args = ia32_fetch_syscall_args, 135 .sv_syscallnames = freebsd32_syscallnames, 136 .sv_shared_page_base = FREEBSD32_SHAREDPAGE, 137 .sv_shared_page_len = PAGE_SIZE, 138 .sv_schedtail = NULL, 139 .sv_thread_detach = NULL, 140 .sv_trap = NULL, 141 .sv_onexec_old = exec_onexec_old, 142 .sv_onexit = exit_onexit, 143 .sv_set_fork_retval = x86_set_fork_retval, 144 }; 145 INIT_SYSENTVEC(elf_ia32_sysvec, &ia32_freebsd_sysvec); 146 147 static Elf32_Brandinfo ia32_brand_info = { 148 .brand = ELFOSABI_FREEBSD, 149 .machine = EM_386, 150 .compat_3_brand = "FreeBSD", 151 .emul_path = NULL, 152 .interp_path = "/libexec/ld-elf.so.1", 153 .sysvec = &ia32_freebsd_sysvec, 154 .interp_newpath = "/libexec/ld-elf32.so.1", 155 .brand_note = &elf32_freebsd_brandnote, 156 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 157 }; 158 159 SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_MIDDLE, 160 (sysinit_cfunc_t) elf32_insert_brand_entry, 161 &ia32_brand_info); 162 163 static Elf32_Brandinfo ia32_brand_oinfo = { 164 .brand = ELFOSABI_FREEBSD, 165 .machine = EM_386, 166 .compat_3_brand = "FreeBSD", 167 .emul_path = NULL, 168 .interp_path = "/usr/libexec/ld-elf.so.1", 169 .sysvec = &ia32_freebsd_sysvec, 170 .interp_newpath = "/libexec/ld-elf32.so.1", 171 .brand_note = &elf32_freebsd_brandnote, 172 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE 173 }; 174 175 SYSINIT(oia32, SI_SUB_EXEC, SI_ORDER_ANY, 176 (sysinit_cfunc_t) elf32_insert_brand_entry, 177 &ia32_brand_oinfo); 178 179 static Elf32_Brandinfo kia32_brand_info = { 180 .brand = ELFOSABI_FREEBSD, 181 .machine = EM_386, 182 .compat_3_brand = "FreeBSD", 183 .emul_path = NULL, 184 .interp_path = "/lib/ld.so.1", 185 .sysvec = &ia32_freebsd_sysvec, 186 .brand_note = &elf32_kfreebsd_brandnote, 187 .flags = BI_CAN_EXEC_DYN | BI_BRAND_NOTE_MANDATORY 188 }; 189 190 SYSINIT(kia32, SI_SUB_EXEC, SI_ORDER_ANY, 191 (sysinit_cfunc_t) elf32_insert_brand_entry, 192 &kia32_brand_info); 193 194 void 195 elf32_dump_thread(struct thread *td, void *dst, size_t *off) 196 { 197 void *buf; 198 size_t len; 199 200 len = 0; 201 if (use_xsave) { 202 if (dst != NULL) { 203 fpugetregs(td); 204 len += elf32_populate_note(NT_X86_XSTATE, 205 get_pcb_user_save_td(td), dst, 206 cpu_max_ext_state_size, &buf); 207 *(uint64_t *)((char *)buf + X86_XSTATE_XCR0_OFFSET) = 208 xsave_mask; 209 } else 210 len += elf32_populate_note(NT_X86_XSTATE, NULL, NULL, 211 cpu_max_ext_state_size, NULL); 212 } 213 *off = len; 214 } 215 216 void 217 ia32_fixlimit(struct rlimit *rl, int which) 218 { 219 220 switch (which) { 221 case RLIMIT_DATA: 222 if (ia32_maxdsiz != 0) { 223 if (rl->rlim_cur > ia32_maxdsiz) 224 rl->rlim_cur = ia32_maxdsiz; 225 if (rl->rlim_max > ia32_maxdsiz) 226 rl->rlim_max = ia32_maxdsiz; 227 } 228 break; 229 case RLIMIT_STACK: 230 if (ia32_maxssiz != 0) { 231 if (rl->rlim_cur > ia32_maxssiz) 232 rl->rlim_cur = ia32_maxssiz; 233 if (rl->rlim_max > ia32_maxssiz) 234 rl->rlim_max = ia32_maxssiz; 235 } 236 break; 237 case RLIMIT_VMEM: 238 if (ia32_maxvmem != 0) { 239 if (rl->rlim_cur > ia32_maxvmem) 240 rl->rlim_cur = ia32_maxvmem; 241 if (rl->rlim_max > ia32_maxvmem) 242 rl->rlim_max = ia32_maxvmem; 243 } 244 break; 245 } 246 } 247