1 /* $NetBSD: linux32_exec_elf32.c,v 1.5 2006/08/07 14:19:57 manu 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 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 #include <sys/cdefs.h> 41 __KERNEL_RCSID(0, "$NetBSD: linux32_exec_elf32.c,v 1.5 2006/08/07 14:19:57 manu Exp $"); 42 43 #define ELFSIZE 32 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/proc.h> 48 #include <sys/malloc.h> 49 #include <sys/vnode.h> 50 #include <sys/exec.h> 51 #include <sys/exec_elf.h> 52 #include <sys/kauth.h> 53 #include <sys/kernel.h> 54 #include <sys/resourcevar.h> 55 #include <sys/signal.h> 56 #include <sys/signalvar.h> 57 58 #include <compat/linux/common/linux_exec.h> 59 #include <compat/netbsd32/netbsd32.h> 60 #include <compat/netbsd32/netbsd32_exec.h> 61 #include <compat/linux32/common/linux32_exec.h> 62 63 #include <machine/frame.h> 64 65 #ifdef DEBUG_LINUX 66 #define DPRINTF(a) uprintf a 67 #else 68 #define DPRINTF(a) 69 #endif 70 71 int linux32_copyinargs(struct exec_package *, struct ps_strings *, 72 void *, size_t, const void *, const void *); 73 74 int 75 ELFNAME2(linux32,probe)(l, epp, eh, itp, pos) 76 struct lwp *l; 77 struct exec_package *epp; 78 void *eh; 79 char *itp; 80 vaddr_t *pos; 81 { 82 int error; 83 84 if (((error = ELFNAME2(linux,signature)(l, epp, eh, itp)) != 0) && 85 #ifdef LINUX32_GCC_SIGNATURE 86 ((error = ELFNAME2(linux,gcc_signature)(l, epp, eh)) != 0) && 87 #endif 88 #ifdef LINUX32_ATEXIT_SIGNATURE 89 ((error = ELFNAME2(linux,atexit_signature)(l, epp, eh)) != 0) && 90 #endif 91 #ifdef LINUX32_DEBUGLINK_SIGNATURE 92 ((error = ELFNAME2(linux,debuglink_signature)(l, epp, eh)) != 0) && 93 #endif 94 1) 95 return error; 96 97 if (itp) { 98 if ((error = emul_find_interp(l, epp->ep_esch->es_emul->e_path, 99 itp))) 100 return (error); 101 } 102 #if 0 103 DPRINTF(("linux32_probe: returning 0\n")); 104 #endif 105 106 epp->ep_flags |= EXEC_32; 107 epp->ep_vm_minaddr = VM_MIN_ADDRESS; 108 epp->ep_vm_maxaddr = USRSTACK32; 109 110 return 0; 111 } 112 113 /* round up and down to page boundaries. */ 114 #define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1)) 115 #define ELF_TRUNC(a, b) ((a) & ~((b) - 1)) 116 117 /* 118 * Copy arguments onto the stack in the normal way, but add some 119 * extra information in case of dynamic binding. 120 */ 121 int 122 linux32_elf32_copyargs(struct lwp *l, struct exec_package *pack, 123 struct ps_strings *arginfo, char **stackp, void *argp) 124 { 125 struct linux32_extra_stack_data *esdp, esd; 126 struct elf_args *ap; 127 struct vattr *vap; 128 Elf_Ehdr *eh; 129 Elf_Phdr *ph; 130 Elf_Addr phdr = 0; 131 u_long phsize; 132 int error; 133 int i; 134 135 if ((error = netbsd32_copyargs(l, pack, arginfo, stackp, argp)) != 0) 136 return error; 137 138 /* 139 * Push extra arguments on the stack needed by dynamically 140 * linked binaries and static binaries as well. 141 */ 142 memset(&esd, 0, sizeof(esd)); 143 esdp = (struct linux32_extra_stack_data *)(*stackp); 144 ap = (struct elf_args *)pack->ep_emul_arg; 145 vap = pack->ep_vap; 146 eh = (Elf_Ehdr *)pack->ep_hdr; 147 148 /* 149 * We forgot this, so we ned to reload it now. XXX keep track of it? 150 */ 151 if (ap == NULL) { 152 phsize = eh->e_phnum * sizeof(Elf_Phdr); 153 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 154 error = exec_read_from(l, pack->ep_vp, eh->e_phoff, ph, phsize); 155 if (error != 0) { 156 for (i = 0; i < eh->e_phnum; i++) { 157 if (ph[i].p_type == PT_PHDR) { 158 phdr = ph[i].p_vaddr; 159 break; 160 } 161 } 162 } 163 free(ph, M_TEMP); 164 } 165 166 167 /* 168 * The exec_package doesn't have a proc pointer and it's not 169 * exactly trivial to add one since the credentials are 170 * changing. XXX Linux uses curlwp's credentials. 171 * Why can't we use them too? XXXad we do now; what's different 172 * about Linux's LWP creds? 173 */ 174 175 i = 0; 176 esd.ai[i].a_type = LINUX_AT_SYSINFO; 177 esd.ai[i++].a_v = (netbsd32_pointer_t)(long)&esdp->kernel_vsyscall[0]; 178 179 esd.ai[i].a_type = LINUX_AT_SYSINFO_EHDR; 180 esd.ai[i++].a_v = (netbsd32_pointer_t)(long)&esdp->elfhdr; 181 182 esd.ai[i].a_type = LINUX_AT_HWCAP; 183 esd.ai[i++].a_v = LINUX32_CPUCAP; 184 185 esd.ai[i].a_type = AT_PAGESZ; 186 esd.ai[i++].a_v = PAGE_SIZE; 187 188 esd.ai[i].a_type = LINUX_AT_CLKTCK; 189 esd.ai[i++].a_v = hz; 190 191 esd.ai[i].a_type = AT_PHDR; 192 esd.ai[i++].a_v = (ap ? ap->arg_phaddr: phdr); 193 194 esd.ai[i].a_type = AT_PHENT; 195 esd.ai[i++].a_v = (ap ? ap->arg_phentsize : eh->e_phentsize); 196 197 esd.ai[i].a_type = AT_PHNUM; 198 esd.ai[i++].a_v = (ap ? ap->arg_phnum : eh->e_phnum); 199 200 esd.ai[i].a_type = AT_BASE; 201 esd.ai[i++].a_v = (ap ? ap->arg_interp : 0); 202 203 esd.ai[i].a_type = AT_FLAGS; 204 esd.ai[i++].a_v = 0; 205 206 esd.ai[i].a_type = AT_ENTRY; 207 esd.ai[i++].a_v = (ap ? ap->arg_entry : eh->e_entry); 208 209 esd.ai[i].a_type = LINUX_AT_EGID; 210 esd.ai[i++].a_v = ((vap->va_mode & S_ISGID) ? 211 vap->va_gid : kauth_cred_getegid(l->l_cred)); 212 213 esd.ai[i].a_type = LINUX_AT_GID; 214 esd.ai[i++].a_v = kauth_cred_getgid(l->l_cred); 215 216 esd.ai[i].a_type = LINUX_AT_EUID; 217 esd.ai[i++].a_v = ((vap->va_mode & S_ISUID) ? 218 vap->va_uid : kauth_cred_geteuid(l->l_cred)); 219 220 esd.ai[i].a_type = LINUX_AT_UID; 221 esd.ai[i++].a_v = kauth_cred_getuid(l->l_cred); 222 223 esd.ai[i].a_type = LINUX_AT_SECURE; 224 esd.ai[i++].a_v = 0; 225 226 esd.ai[i].a_type = LINUX_AT_PLATFORM; 227 esd.ai[i++].a_v = (netbsd32_pointer_t)(long)&esdp->hw_platform[0]; 228 229 esd.ai[i].a_type = AT_NULL; 230 esd.ai[i++].a_v = 0; 231 232 #ifdef DEBUG_LINUX 233 if (i != LINUX32_ELF_AUX_ENTRIES) { 234 printf("linux32_elf32_copyargs: %d Aux entries\n", i); 235 return EINVAL; 236 } 237 #endif 238 239 memcpy(esd.kernel_vsyscall, linux32_kernel_vsyscall, 240 sizeof(linux32_kernel_vsyscall)); 241 242 memcpy(&esd.elfhdr, eh, sizeof(*eh)); 243 244 strcpy(esd.hw_platform, LINUX32_PLATFORM); 245 246 if (ap) { 247 free((char *)ap, M_TEMP); 248 pack->ep_emul_arg = NULL; 249 } 250 251 /* 252 * Copy out the ELF auxiliary table and hw platform name 253 */ 254 if ((error = copyout(&esd, esdp, sizeof(esd))) != 0) 255 return error; 256 *stackp += sizeof(esd); 257 return 0; 258 } 259 260