1 /* $NetBSD: linux32_exec_elf32.c,v 1.3 2006/06/13 16:23:57 skd 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 1.3 2006/06/13 16:23:57 skd 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 #if 0 72 static int ELFNAME2(linux32,signature) __P((struct lwp *, struct exec_package *, 73 Elf_Ehdr *, char *)); 74 #ifdef LINUX_GCC_SIGNATURE 75 static int ELFNAME2(linux32,gcc_signature) __P((struct lwp *l, 76 struct exec_package *, Elf_Ehdr *)); 77 #endif 78 #ifdef LINUX_ATEXIT_SIGNATURE 79 static int ELFNAME2(linux32,atexit_signature) __P((struct lwp *l, 80 struct exec_package *, Elf_Ehdr *)); 81 #endif 82 #endif 83 int linux32_copyinargs(struct exec_package *, struct ps_strings *, 84 void *, size_t, const void *, const void *); 85 86 int 87 ELFNAME2(linux32,probe)(l, epp, eh, itp, pos) 88 struct lwp *l; 89 struct exec_package *epp; 90 void *eh; 91 char *itp; 92 vaddr_t *pos; 93 { 94 int error; 95 96 if (((error = ELFNAME2(linux,signature)(l, epp, eh, itp)) != 0) && 97 #ifdef LINUX_GCC_SIGNATURE 98 ((error = ELFNAME2(linux,gcc_signature)(l, epp, eh)) != 0) && 99 #endif 100 #ifdef LINUX_ATEXIT_SIGNATURE 101 ((error = ELFNAME2(linux,atexit_signature)(l, epp, eh)) != 0) && 102 #endif 103 1) 104 return error; 105 106 if (itp) { 107 if ((error = emul_find_interp(l, epp->ep_esch->es_emul->e_path, 108 itp))) 109 return (error); 110 } 111 #if 0 112 DPRINTF(("linux32_probe: returning 0\n")); 113 #endif 114 115 epp->ep_flags |= EXEC_32; 116 epp->ep_vm_minaddr = VM_MIN_ADDRESS; 117 epp->ep_vm_maxaddr = USRSTACK32; 118 119 return 0; 120 } 121 122 /* round up and down to page boundaries. */ 123 #define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1)) 124 #define ELF_TRUNC(a, b) ((a) & ~((b) - 1)) 125 126 /* 127 * Copy arguments onto the stack in the normal way, but add some 128 * extra information in case of dynamic binding. 129 */ 130 int 131 linux32_elf32_copyargs(struct lwp *l, struct exec_package *pack, 132 struct ps_strings *arginfo, char **stackp, void *argp) 133 { 134 struct linux32_extra_stack_data *esdp, esd; 135 struct elf_args *ap; 136 struct vattr *vap; 137 struct proc *p; 138 Elf_Ehdr *eh; 139 Elf_Phdr *ph; 140 Elf_Addr phdr = 0; 141 u_long phsize; 142 int error; 143 int i; 144 145 p = l->l_proc; 146 147 if ((error = netbsd32_copyargs(l, pack, arginfo, stackp, argp)) != 0) 148 return error; 149 150 /* 151 * Push extra arguments on the stack needed by dynamically 152 * linked binaries and static binaries as well. 153 */ 154 memset(&esd, 0, sizeof(esd)); 155 esdp = (struct linux32_extra_stack_data *)(*stackp); 156 ap = (struct elf_args *)pack->ep_emul_arg; 157 vap = pack->ep_vap; 158 eh = (Elf_Ehdr *)pack->ep_hdr; 159 160 /* 161 * We forgot this, so we ned to reload it now. XXX keep track of it? 162 */ 163 if (ap == NULL) { 164 phsize = eh->e_phnum * sizeof(Elf_Phdr); 165 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 166 error = exec_read_from(l, pack->ep_vp, eh->e_phoff, ph, phsize); 167 if (error != 0) { 168 for (i = 0; i < eh->e_phnum; i++) { 169 if (ph[i].p_type == PT_PHDR) { 170 phdr = ph[i].p_vaddr; 171 break; 172 } 173 } 174 } 175 free(ph, M_TEMP); 176 } 177 178 179 /* 180 * The exec_package doesn't have a proc pointer and it's not 181 * exactly trivial to add one since the credentials are 182 * changing. XXX Linux uses curlwp's credentials. 183 * Why can't we use them too? 184 */ 185 186 i = 0; 187 esd.ai[i].a_type = LINUX_AT_SYSINFO; 188 esd.ai[i++].a_v = (netbsd32_pointer_t)(long)&esdp->kernel_vsyscall[0]; 189 190 esd.ai[i].a_type = LINUX_AT_SYSINFO_EHDR; 191 esd.ai[i++].a_v = (netbsd32_pointer_t)(long)&esdp->elfhdr; 192 193 esd.ai[i].a_type = LINUX_AT_HWCAP; 194 esd.ai[i++].a_v = LINUX32_CPUCAP; 195 196 esd.ai[i].a_type = AT_PAGESZ; 197 esd.ai[i++].a_v = PAGE_SIZE; 198 199 esd.ai[i].a_type = LINUX_AT_CLKTCK; 200 esd.ai[i++].a_v = hz; 201 202 esd.ai[i].a_type = AT_PHDR; 203 esd.ai[i++].a_v = (ap ? ap->arg_phaddr: phdr); 204 205 esd.ai[i].a_type = AT_PHENT; 206 esd.ai[i++].a_v = (ap ? ap->arg_phentsize : eh->e_phentsize); 207 208 esd.ai[i].a_type = AT_PHNUM; 209 esd.ai[i++].a_v = (ap ? ap->arg_phnum : eh->e_phnum); 210 211 esd.ai[i].a_type = AT_BASE; 212 esd.ai[i++].a_v = (ap ? ap->arg_interp : 0); 213 214 esd.ai[i].a_type = AT_FLAGS; 215 esd.ai[i++].a_v = 0; 216 217 esd.ai[i].a_type = AT_ENTRY; 218 esd.ai[i++].a_v = (ap ? ap->arg_entry : eh->e_entry); 219 220 esd.ai[i].a_type = LINUX_AT_EGID; 221 esd.ai[i++].a_v = 222 ((vap->va_mode & S_ISGID) ? vap->va_gid : kauth_cred_getegid(p->p_cred)); 223 224 esd.ai[i].a_type = LINUX_AT_GID; 225 esd.ai[i++].a_v = kauth_cred_getgid(p->p_cred); 226 227 esd.ai[i].a_type = LINUX_AT_EUID; 228 esd.ai[i++].a_v = 229 ((vap->va_mode & S_ISUID) ? vap->va_uid : kauth_cred_geteuid(p->p_cred)); 230 231 esd.ai[i].a_type = LINUX_AT_UID; 232 esd.ai[i++].a_v = kauth_cred_getuid(p->p_cred); 233 234 esd.ai[i].a_type = LINUX_AT_SECURE; 235 esd.ai[i++].a_v = 0; 236 237 esd.ai[i].a_type = LINUX_AT_PLATFORM; 238 esd.ai[i++].a_v = (netbsd32_pointer_t)(long)&esdp->hw_platform[0]; 239 240 esd.ai[i].a_type = AT_NULL; 241 esd.ai[i++].a_v = 0; 242 243 #ifdef DEBUG_LINUX 244 if (i != LINUX32_ELF_AUX_ENTRIES) { 245 printf("linux32_elf32_copyargs: %d Aux entries\n", i); 246 return EINVAL; 247 } 248 #endif 249 250 memcpy(esd.kernel_vsyscall, linux32_kernel_vsyscall, 251 sizeof(linux32_kernel_vsyscall)); 252 253 memcpy(&esd.elfhdr, eh, sizeof(*eh)); 254 255 strcpy(esd.hw_platform, LINUX32_PLATFORM); 256 257 if (ap) { 258 free((char *)ap, M_TEMP); 259 pack->ep_emul_arg = NULL; 260 } 261 262 /* 263 * Copy out the ELF auxiliary table and hw platform name 264 */ 265 if ((error = copyout(&esd, esdp, sizeof(esd))) != 0) 266 return error; 267 *stackp += sizeof(esd); 268 return 0; 269 } 270 271