| 1 | /* $NetBSD: linux32_exec_elf32.c,v 1.19 2016/08/06 15:13:13 maxv 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 1.19 2016/08/06 15:13:13 maxv 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 | #include <machine/cpuvar.h> |
| 57 | #include <machine/frame.h> |
| 58 | |
| 59 | #ifdef DEBUG_LINUX |
| 60 | #define DPRINTF(a) uprintf a |
| 61 | #else |
| 62 | #define DPRINTF(a) |
| 63 | #endif |
| 64 | |
| 65 | int linux32_copyinargs(struct exec_package *, struct ps_strings *, |
| 66 | void *, size_t, const void *, const void *); |
| 67 | |
| 68 | int |
| 69 | ELFNAME2(linux32,probe)(struct lwp *l, struct exec_package *epp, |
| 70 | void *eh, char *itp, vaddr_t *pos) |
| 71 | { |
| 72 | int error; |
| 73 | |
| 74 | if (((error = ELFNAME2(linux,signature)(l, epp, eh, itp)) != 0) && |
| 75 | #ifdef LINUX32_GCC_SIGNATURE |
| 76 | ((error = ELFNAME2(linux,gcc_signature)(l, epp, eh)) != 0) && |
| 77 | #endif |
| 78 | #ifdef LINUX32_ATEXIT_SIGNATURE |
| 79 | ((error = ELFNAME2(linux,atexit_signature)(l, epp, eh)) != 0) && |
| 80 | #endif |
| 81 | #ifdef LINUX32_DEBUGLINK_SIGNATURE |
| 82 | ((error = ELFNAME2(linux,debuglink_signature)(l, epp, eh)) != 0) && |
| 83 | #endif |
| 84 | 1) |
| 85 | return error; |
| 86 | |
| 87 | if (itp) { |
| 88 | if ((error = emul_find_interp(l, epp, itp))) |
| 89 | return (error); |
| 90 | } |
| 91 | #if 0 |
| 92 | DPRINTF(("linux32_probe: returning 0\n" )); |
| 93 | #endif |
| 94 | |
| 95 | epp->ep_flags |= EXEC_32 | EXEC_FORCEAUX; |
| 96 | epp->ep_vm_minaddr = exec_vm_minaddr(VM_MIN_ADDRESS); |
| 97 | epp->ep_vm_maxaddr = USRSTACK32; |
| 98 | |
| 99 | return 0; |
| 100 | } |
| 101 | |
| 102 | /* |
| 103 | * Copy arguments onto the stack in the normal way, but add some |
| 104 | * extra information in case of dynamic binding. |
| 105 | */ |
| 106 | int |
| 107 | linux32_elf32_copyargs(struct lwp *l, struct exec_package *pack, |
| 108 | struct ps_strings *arginfo, char **stackp, void *argp) |
| 109 | { |
| 110 | Aux32Info ai[LINUX32_ELF_AUX_ENTRIES], *a; |
| 111 | uint32_t randbytes[4]; |
| 112 | struct elf_args *ap; |
| 113 | struct vattr *vap; |
| 114 | size_t len; |
| 115 | int error; |
| 116 | |
| 117 | if ((error = netbsd32_copyargs(l, pack, arginfo, stackp, argp)) != 0) |
| 118 | return error; |
| 119 | |
| 120 | a = ai; |
| 121 | |
| 122 | memset(ai, 0, sizeof(ai)); |
| 123 | |
| 124 | /* |
| 125 | * Push extra arguments on the stack needed by dynamically |
| 126 | * linked binaries and static binaries as well. |
| 127 | */ |
| 128 | |
| 129 | a->a_type = AT_PAGESZ; |
| 130 | a->a_v = PAGE_SIZE; |
| 131 | a++; |
| 132 | |
| 133 | if ((ap = (struct elf_args *)pack->ep_emul_arg)) { |
| 134 | |
| 135 | a->a_type = AT_PHDR; |
| 136 | a->a_v = ap->arg_phaddr; |
| 137 | a++; |
| 138 | |
| 139 | a->a_type = AT_PHENT; |
| 140 | a->a_v = ap->arg_phentsize; |
| 141 | a++; |
| 142 | |
| 143 | a->a_type = AT_PHNUM; |
| 144 | a->a_v = ap->arg_phnum; |
| 145 | a++; |
| 146 | |
| 147 | a->a_type = AT_BASE; |
| 148 | a->a_v = ap->arg_interp; |
| 149 | a++; |
| 150 | |
| 151 | a->a_type = AT_FLAGS; |
| 152 | a->a_v = 0; |
| 153 | a++; |
| 154 | |
| 155 | a->a_type = AT_ENTRY; |
| 156 | a->a_v = ap->arg_entry; |
| 157 | a++; |
| 158 | |
| 159 | exec_free_emul_arg(pack); |
| 160 | } |
| 161 | |
| 162 | /* Linux-specific items */ |
| 163 | a->a_type = LINUX_AT_CLKTCK; |
| 164 | a->a_v = hz; |
| 165 | a++; |
| 166 | |
| 167 | vap = pack->ep_vap; |
| 168 | |
| 169 | a->a_type = LINUX_AT_UID; |
| 170 | a->a_v = kauth_cred_getuid(l->l_cred); |
| 171 | a++; |
| 172 | |
| 173 | a->a_type = LINUX_AT_EUID; |
| 174 | a->a_v = ((vap->va_mode & S_ISUID) ? |
| 175 | vap->va_uid : kauth_cred_geteuid(l->l_cred)); |
| 176 | a++; |
| 177 | |
| 178 | a->a_type = LINUX_AT_GID; |
| 179 | a->a_v = kauth_cred_getgid(l->l_cred); |
| 180 | a++; |
| 181 | |
| 182 | a->a_type = LINUX_AT_EGID; |
| 183 | a->a_v = ((vap->va_mode & S_ISGID) ? |
| 184 | vap->va_gid : kauth_cred_getegid(l->l_cred)); |
| 185 | a++; |
| 186 | |
| 187 | a->a_type = LINUX_AT_SECURE; |
| 188 | a->a_v = 0; |
| 189 | a++; |
| 190 | |
| 191 | a->a_type = LINUX_AT_RANDOM; |
| 192 | a->a_v = NETBSD32PTR32I(*stackp); |
| 193 | a++; |
| 194 | |
| 195 | #if 0 |
| 196 | /* XXX: increase LINUX32_ELF_AUX_ENTRIES if we enable those things */ |
| 197 | |
| 198 | a->a_type = LINUX_AT_SYSINFO; |
| 199 | a->a_v = NETBSD32PTR32I(&esdp->kernel_vsyscall[0]); |
| 200 | a++; |
| 201 | |
| 202 | a->a_type = LINUX_AT_SYSINFO_EHDR; |
| 203 | a->a_v = NETBSD32PTR32I(&esdp->elfhdr); |
| 204 | a++; |
| 205 | |
| 206 | a->a_type = LINUX_AT_HWCAP; |
| 207 | a->a_v = LINUX32_CPUCAP; |
| 208 | a++; |
| 209 | |
| 210 | a->a_type = LINUX_AT_PLATFORM; |
| 211 | a->a_v = NETBSD32PTR32I(&esdp->hw_platform[0]); |
| 212 | a++; |
| 213 | #endif |
| 214 | |
| 215 | a->a_type = AT_NULL; |
| 216 | a->a_v = 0; |
| 217 | a++; |
| 218 | |
| 219 | randbytes[0] = cprng_strong32(); |
| 220 | randbytes[1] = cprng_strong32(); |
| 221 | randbytes[2] = cprng_strong32(); |
| 222 | randbytes[3] = cprng_strong32(); |
| 223 | |
| 224 | len = sizeof(randbytes); |
| 225 | if ((error = copyout(randbytes, *stackp, len)) != 0) |
| 226 | return error; |
| 227 | *stackp += len; |
| 228 | |
| 229 | #if 0 |
| 230 | memcpy(esd.kernel_vsyscall, linux32_kernel_vsyscall, |
| 231 | sizeof(linux32_kernel_vsyscall)); |
| 232 | |
| 233 | memcpy(&esd.elfhdr, eh, sizeof(*eh)); |
| 234 | |
| 235 | strcpy(esd.hw_platform, LINUX32_PLATFORM); |
| 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 | #endif |
| 244 | |
| 245 | len = (a - ai) * sizeof(Aux32Info); |
| 246 | KASSERT(len <= LINUX32_ELF_AUX_ENTRIES * sizeof(Aux32Info)); |
| 247 | if ((error = copyout(ai, *stackp, len)) != 0) |
| 248 | return error; |
| 249 | *stackp += len; |
| 250 | |
| 251 | return 0; |
| 252 | } |
| 253 | |