linux32_exec_elf32.c revision 1.22
1 /* $NetBSD: linux32_exec_elf32.c,v 1.22 2021/11/25 03:08:04 ryo Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 1998, 2000, 2001,2006 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Christos Zoulas, Frank van der Linden, Eric Haszlakiewicz and 9 * Emmanuel Dreyfus. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: linux32_exec_elf32.c,v 1.22 2021/11/25 03:08:04 ryo Exp $"); 35 36 #define ELFSIZE 32 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/proc.h> 41 #include <sys/vnode.h> 42 #include <sys/exec.h> 43 #include <sys/exec_elf.h> 44 #include <sys/kauth.h> 45 #include <sys/kernel.h> 46 #include <sys/resourcevar.h> 47 #include <sys/signal.h> 48 #include <sys/signalvar.h> 49 #include <sys/cprng.h> 50 51 #include <compat/linux/common/linux_exec.h> 52 #include <compat/netbsd32/netbsd32.h> 53 #include <compat/netbsd32/netbsd32_exec.h> 54 #include <compat/linux32/common/linux32_exec.h> 55 56 #ifndef __aarch64__ 57 #include <machine/cpuvar.h> 58 #endif 59 #include <machine/frame.h> 60 61 #ifdef DEBUG_LINUX 62 #define DPRINTF(a) uprintf a 63 #else 64 #define DPRINTF(a) 65 #endif 66 67 int linux32_copyinargs(struct exec_package *, struct ps_strings *, 68 void *, size_t, const void *, const void *); 69 70 int 71 ELFNAME2(linux32,probe)(struct lwp *l, struct exec_package *epp, 72 void *eh, char *itp, vaddr_t *pos) 73 { 74 int error; 75 76 if (((error = ELFNAME2(linux,signature)(l, epp, eh, itp)) != 0) && 77 #ifdef LINUX32_GCC_SIGNATURE 78 ((error = ELFNAME2(linux,gcc_signature)(l, epp, eh)) != 0) && 79 #endif 80 #ifdef LINUX32_ATEXIT_SIGNATURE 81 ((error = ELFNAME2(linux,atexit_signature)(l, epp, eh)) != 0) && 82 #endif 83 #ifdef LINUX32_DEBUGLINK_SIGNATURE 84 ((error = ELFNAME2(linux,debuglink_signature)(l, epp, eh)) != 0) && 85 #endif 86 1) 87 return error; 88 89 if (itp) { 90 if ((error = emul_find_interp(l, epp, itp))) 91 return (error); 92 } 93 #if 0 94 DPRINTF(("linux32_probe: returning 0\n")); 95 #endif 96 97 epp->ep_flags |= EXEC_32 | EXEC_FORCEAUX; 98 epp->ep_vm_minaddr = exec_vm_minaddr(VM_MIN_ADDRESS); 99 epp->ep_vm_maxaddr = USRSTACK32; 100 101 return 0; 102 } 103 104 /* 105 * Copy arguments onto the stack in the normal way, but add some 106 * extra information in case of dynamic binding. 107 */ 108 int 109 linux32_elf32_copyargs(struct lwp *l, struct exec_package *pack, 110 struct ps_strings *arginfo, char **stackp, void *argp) 111 { 112 struct linux32_extra_stack_data esd, *esdp; 113 Aux32Info *a, *ai __diagused; 114 struct elf_args *ap; 115 struct vattr *vap; 116 int error; 117 118 if ((error = netbsd32_copyargs(l, pack, arginfo, stackp, argp)) != 0) 119 return error; 120 121 esdp = (struct linux32_extra_stack_data *)(*stackp); /* userspace */ 122 123 memset(&esd, 0, sizeof(esd)); 124 ai = a = esd.ai; 125 126 /* 127 * Push extra arguments on the stack needed by dynamically 128 * linked binaries and static binaries as well. 129 */ 130 131 a->a_type = AT_PAGESZ; 132 a->a_v = PAGE_SIZE; 133 a++; 134 135 if ((ap = (struct elf_args *)pack->ep_emul_arg)) { 136 137 a->a_type = AT_PHDR; 138 a->a_v = ap->arg_phaddr; 139 a++; 140 141 a->a_type = AT_PHENT; 142 a->a_v = ap->arg_phentsize; 143 a++; 144 145 a->a_type = AT_PHNUM; 146 a->a_v = ap->arg_phnum; 147 a++; 148 149 a->a_type = AT_BASE; 150 a->a_v = ap->arg_interp; 151 a++; 152 153 a->a_type = AT_FLAGS; 154 a->a_v = 0; 155 a++; 156 157 a->a_type = AT_ENTRY; 158 a->a_v = ap->arg_entry; 159 a++; 160 161 exec_free_emul_arg(pack); 162 } 163 164 /* Linux-specific items */ 165 a->a_type = LINUX_AT_CLKTCK; 166 a->a_v = hz; 167 a++; 168 169 vap = pack->ep_vap; 170 171 a->a_type = LINUX_AT_UID; 172 a->a_v = kauth_cred_getuid(l->l_cred); 173 a++; 174 175 a->a_type = LINUX_AT_EUID; 176 a->a_v = ((vap->va_mode & S_ISUID) ? 177 vap->va_uid : kauth_cred_geteuid(l->l_cred)); 178 a++; 179 180 a->a_type = LINUX_AT_GID; 181 a->a_v = kauth_cred_getgid(l->l_cred); 182 a++; 183 184 a->a_type = LINUX_AT_EGID; 185 a->a_v = ((vap->va_mode & S_ISGID) ? 186 vap->va_gid : kauth_cred_getegid(l->l_cred)); 187 a++; 188 189 a->a_type = LINUX_AT_SECURE; 190 a->a_v = 0; 191 a++; 192 193 a->a_type = LINUX_AT_RANDOM; 194 a->a_v = NETBSD32PTR32I(&esdp->randbytes[0]); 195 a++; 196 esd.randbytes[0] = cprng_strong32(); 197 esd.randbytes[1] = cprng_strong32(); 198 esd.randbytes[2] = cprng_strong32(); 199 esd.randbytes[3] = cprng_strong32(); 200 201 #if 0 /* defined(__amd64__) */ 202 /* XXX: broken. vsyscall must be placed in the executable page */ 203 a->a_type = LINUX_AT_SYSINFO; 204 a->a_v = NETBSD32PTR32I(&esdp->kernel_vsyscall[0]); 205 a++; 206 memcpy(esd.kernel_vsyscall, linux32_kernel_vsyscall, 207 sizeof(linux32_kernel_vsyscall)); 208 #endif 209 210 #if 0 /* notyet */ 211 a->a_type = LINUX_AT_SYSINFO_EHDR; 212 a->a_v = NETBSD32PTR32I(&esdp->elfhdr); 213 a++; 214 memcpy(&esd.elfhdr, eh, sizeof(*eh)); 215 #endif 216 217 #ifdef LINUX32_CPUCAP 218 a->a_type = LINUX_AT_HWCAP; 219 a->a_v = LINUX32_CPUCAP; 220 a++; 221 #endif 222 223 #ifdef LINUX32_PLATFORM 224 a->a_type = LINUX_AT_PLATFORM; 225 a->a_v = NETBSD32PTR32I(&esdp->hw_platform[0]); 226 a++; 227 strncpy(esd.hw_platform, LINUX32_PLATFORM, sizeof(esd.hw_platform)); 228 #endif 229 230 a->a_type = AT_NULL; 231 a->a_v = 0; 232 a++; 233 234 KASSERTMSG(a <= &ai[LINUX32_ELF_AUX_ENTRIES], 235 "increase LINUX32_ELF_AUX_ENTRIES to %lu", a - ai); 236 237 /* 238 * Copy out the ELF auxiliary table and hw platform name 239 */ 240 if ((error = copyout(&esd, esdp, sizeof(esd))) != 0) 241 return error; 242 *stackp += sizeof(esd); 243 244 return 0; 245 } 246
Indexes created Mon Sep 22 13:09:51 GMT 2025