1 /* $NetBSD: linux_exec.c,v 1.121 2020/02/15 17:13:55 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 1994, 1995, 1998, 2000, 2007, 2008, 2020 5 * The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Christos Zoulas, Frank van der Linden, Eric Haszlakiewicz and 10 * Thor Lancelot Simon. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: linux_exec.c,v 1.121 2020/02/15 17:13:55 ad Exp $"); 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/kernel.h> 40 #include <sys/lwp.h> 41 #include <sys/proc.h> 42 #include <sys/namei.h> 43 #include <sys/vnode.h> 44 #include <sys/mount.h> 45 #include <sys/exec.h> 46 #include <sys/exec_elf.h> 47 48 #include <sys/mman.h> 49 #include <sys/syscallargs.h> 50 51 #include <sys/ptrace.h> /* For proc_reparent() */ 52 53 #include <uvm/uvm_extern.h> 54 55 #include <sys/cpu.h> 56 #include <machine/reg.h> 57 58 #include <compat/linux/common/linux_types.h> 59 #include <compat/linux/common/linux_signal.h> 60 #include <compat/linux/common/linux_util.h> 61 #include <compat/linux/common/linux_sched.h> 62 #include <compat/linux/common/linux_machdep.h> 63 #include <compat/linux/common/linux_exec.h> 64 #include <compat/linux/common/linux_futex.h> 65 #include <compat/linux/common/linux_ipc.h> 66 #include <compat/linux/common/linux_sem.h> 67 68 #include <compat/linux/linux_syscallargs.h> 69 #include <compat/linux/linux_syscall.h> 70 #include <compat/linux/common/linux_misc.h> 71 #include <compat/linux/common/linux_errno.h> 72 #include <compat/linux/common/linux_emuldata.h> 73 74 extern struct sysent linux_sysent[]; 75 extern const uint32_t linux_sysent_nomodbits[]; 76 extern const char * const linux_syscallnames[]; 77 extern char linux_sigcode[], linux_esigcode[]; 78 79 /* 80 * Emulation switch. 81 */ 82 83 struct uvm_object *emul_linux_object; 84 85 struct emul emul_linux = { 86 .e_name = "linux", 87 .e_path = "/emul/linux", 88 #ifndef __HAVE_MINIMAL_EMUL 89 .e_flags = 0, 90 .e_errno = native_to_linux_errno, 91 .e_nosys = LINUX_SYS_syscall, 92 .e_nsysent = LINUX_SYS_NSYSENT, 93 #endif 94 .e_sysent = linux_sysent, 95 .e_nomodbits = linux_sysent_nomodbits, 96 .e_syscallnames = linux_syscallnames, 97 .e_sendsig = linux_sendsig, 98 .e_trapsignal = linux_trapsignal, 99 .e_sigcode = linux_sigcode, 100 .e_esigcode = linux_esigcode, 101 .e_sigobject = &emul_linux_object, 102 .e_setregs = linux_setregs, 103 .e_proc_exec = linux_e_proc_exec, 104 .e_proc_fork = linux_e_proc_fork, 105 .e_proc_exit = linux_e_proc_exit, 106 .e_lwp_fork = linux_e_lwp_fork, 107 .e_lwp_exit = linux_e_lwp_exit, 108 #ifdef __HAVE_SYSCALL_INTERN 109 .e_syscall_intern = linux_syscall_intern, 110 #else 111 #error Implement __HAVE_SYSCALL_INTERN for this platform 112 #endif 113 .e_sysctlovly = NULL, 114 .e_vm_default_addr = uvm_default_mapaddr, 115 .e_usertrap = linux_usertrap, 116 .e_ucsize = 0, 117 .e_startlwp = NULL 118 }; 119 120 void 121 linux_e_proc_exec(struct proc *p, struct exec_package *epp) 122 { 123 struct lwp *l; 124 125 l = LIST_FIRST(&p->p_lwps); 126 if (l->l_emuldata == NULL) { 127 l->l_emuldata = kmem_zalloc(sizeof(struct linux_emuldata), KM_SLEEP); 128 } else { 129 memset(l->l_emuldata, 0, sizeof (struct linux_emuldata)); 130 } 131 132 KASSERT(p->p_nlwps == 1); 133 l = LIST_FIRST(&p->p_lwps); 134 lwp_renumber(l, p->p_pid); 135 } 136 137 void 138 linux_e_proc_exit(struct proc *p) 139 { 140 struct lwp *l; 141 142 KASSERT(p->p_nlwps == 1); 143 l = LIST_FIRST(&p->p_lwps); 144 linux_e_lwp_exit(l); 145 } 146 147 void 148 linux_e_proc_fork(struct proc *p2, struct lwp *l1, int flags) 149 { 150 struct linux_emuldata *led1, *led2; 151 struct lwp *l2; 152 153 KASSERT(p2->p_nlwps == 1); 154 l2 = LIST_FIRST(&p2->p_lwps); 155 lwp_renumber(l2, p2->p_pid); 156 led1 = l1->l_emuldata; 157 led2 = l2->l_emuldata; 158 led2->led_child_tidptr = led1->led_child_tidptr; 159 } 160 161 void 162 linux_e_lwp_fork(struct lwp *l1, struct lwp *l2) 163 { 164 struct linux_emuldata *led2; 165 166 led2 = kmem_zalloc(sizeof(*led2), KM_SLEEP); 167 l2->l_emuldata = led2; 168 } 169 170 void 171 linux_e_lwp_exit(struct lwp *l) 172 { 173 struct linux_emuldata *led; 174 struct linux_sys_futex_args cup; 175 register_t retval; 176 int error, zero = 0; 177 178 led = l->l_emuldata; 179 if (led->led_clear_tid == NULL) { 180 return; 181 } 182 183 /* Emulate LINUX_CLONE_CHILD_CLEARTID */ 184 error = copyout(&zero, led->led_clear_tid, sizeof(zero)); 185 #ifdef DEBUG_LINUX 186 if (error != 0) 187 printf("%s: cannot clear TID\n", __func__); 188 #endif 189 190 SCARG(&cup, uaddr) = led->led_clear_tid; 191 SCARG(&cup, op) = LINUX_FUTEX_WAKE; 192 SCARG(&cup, val) = 0x7fffffff; /* Awake everyone */ 193 SCARG(&cup, timeout) = NULL; 194 SCARG(&cup, uaddr2) = NULL; 195 SCARG(&cup, val3) = 0; 196 if ((error = linux_sys_futex(curlwp, &cup, &retval)) != 0) 197 printf("%s: linux_sys_futex failed\n", __func__); 198 199 release_futexes(l); 200 201 led = l->l_emuldata; 202 l->l_emuldata = NULL; 203 kmem_free(led, sizeof(*led)); 204 } 205