linux32_exec_elf32.c revision 1.7.32.1
1 /* $NetBSD: linux32_exec_elf32.c,v 1.7.32.1 2008/05/16 02:23:44 yamt 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 1.7.32.1 2008/05/16 02:23:44 yamt 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/malloc.h> 42 #include <sys/vnode.h> 43 #include <sys/exec.h> 44 #include <sys/exec_elf.h> 45 #include <sys/kauth.h> 46 #include <sys/kernel.h> 47 #include <sys/resourcevar.h> 48 #include <sys/signal.h> 49 #include <sys/signalvar.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/frame.h> 57 58 #ifdef DEBUG_LINUX 59 #define DPRINTF(a) uprintf a 60 #else 61 #define DPRINTF(a) 62 #endif 63 64 int linux32_copyinargs(struct exec_package *, struct ps_strings *, 65 void *, size_t, const void *, const void *); 66 67 int 68 ELFNAME2(linux32,probe)(l, epp, eh, itp, pos) 69 struct lwp *l; 70 struct exec_package *epp; 71 void *eh; 72 char *itp; 73 vaddr_t *pos; 74 { 75 int error; 76 77 if (((error = ELFNAME2(linux,signature)(l, epp, eh, itp)) != 0) && 78 #ifdef LINUX32_GCC_SIGNATURE 79 ((error = ELFNAME2(linux,gcc_signature)(l, epp, eh)) != 0) && 80 #endif 81 #ifdef LINUX32_ATEXIT_SIGNATURE 82 ((error = ELFNAME2(linux,atexit_signature)(l, epp, eh)) != 0) && 83 #endif 84 #ifdef LINUX32_DEBUGLINK_SIGNATURE 85 ((error = ELFNAME2(linux,debuglink_signature)(l, epp, eh)) != 0) && 86 #endif 87 1) 88 return error; 89 90 if (itp) { 91 if ((error = emul_find_interp(l, epp, itp))) 92 return (error); 93 } 94 #if 0 95 DPRINTF(("linux32_probe: returning 0\n")); 96 #endif 97 98 epp->ep_flags |= EXEC_32; 99 epp->ep_vm_minaddr = VM_MIN_ADDRESS; 100 epp->ep_vm_maxaddr = USRSTACK32; 101 102 return 0; 103 } 104 105 /* round up and down to page boundaries. */ 106 #define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1)) 107 #define ELF_TRUNC(a, b) ((a) & ~((b) - 1)) 108 109 /* 110 * Copy arguments onto the stack in the normal way, but add some 111 * extra information in case of dynamic binding. 112 */ 113 int 114 linux32_elf32_copyargs(struct lwp *l, struct exec_package *pack, 115 struct ps_strings *arginfo, char **stackp, void *argp) 116 { 117 struct linux32_extra_stack_data *esdp, esd; 118 struct elf_args *ap; 119 struct vattr *vap; 120 Elf_Ehdr *eh; 121 Elf_Phdr *ph; 122 Elf_Addr phdr = 0; 123 u_long phsize; 124 int error; 125 int i; 126 127 if ((error = netbsd32_copyargs(l, pack, arginfo, stackp, argp)) != 0) 128 return error; 129 130 /* 131 * Push extra arguments on the stack needed by dynamically 132 * linked binaries and static binaries as well. 133 */ 134 memset(&esd, 0, sizeof(esd)); 135 esdp = (struct linux32_extra_stack_data *)(*stackp); 136 ap = (struct elf_args *)pack->ep_emul_arg; 137 vap = pack->ep_vap; 138 eh = (Elf_Ehdr *)pack->ep_hdr; 139 140 /* 141 * We forgot this, so we ned to reload it now. XXX keep track of it? 142 */ 143 if (ap == NULL) { 144 phsize = eh->e_phnum * sizeof(Elf_Phdr); 145 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 146 error = exec_read_from(l, pack->ep_vp, eh->e_phoff, ph, phsize); 147 if (error != 0) { 148 for (i = 0; i < eh->e_phnum; i++) { 149 if (ph[i].p_type == PT_PHDR) { 150 phdr = ph[i].p_vaddr; 151 break; 152 } 153 } 154 } 155 free(ph, M_TEMP); 156 } 157 158 159 /* 160 * The exec_package doesn't have a proc pointer and it's not 161 * exactly trivial to add one since the credentials are 162 * changing. XXX Linux uses curlwp's credentials. 163 * Why can't we use them too? XXXad we do now; what's different 164 * about Linux's LWP creds? 165 */ 166 167 i = 0; 168 esd.ai[i].a_type = LINUX_AT_SYSINFO; 169 esd.ai[i++].a_v = NETBSD32PTR32I(&esdp->kernel_vsyscall[0]); 170 171 esd.ai[i].a_type = LINUX_AT_SYSINFO_EHDR; 172 esd.ai[i++].a_v = NETBSD32PTR32I(&esdp->elfhdr); 173 174 esd.ai[i].a_type = LINUX_AT_HWCAP; 175 esd.ai[i++].a_v = LINUX32_CPUCAP; 176 177 esd.ai[i].a_type = AT_PAGESZ; 178 esd.ai[i++].a_v = PAGE_SIZE; 179 180 esd.ai[i].a_type = LINUX_AT_CLKTCK; 181 esd.ai[i++].a_v = hz; 182 183 esd.ai[i].a_type = AT_PHDR; 184 esd.ai[i++].a_v = (ap ? ap->arg_phaddr: phdr); 185 186 esd.ai[i].a_type = AT_PHENT; 187 esd.ai[i++].a_v = (ap ? ap->arg_phentsize : eh->e_phentsize); 188 189 esd.ai[i].a_type = AT_PHNUM; 190 esd.ai[i++].a_v = (ap ? ap->arg_phnum : eh->e_phnum); 191 192 esd.ai[i].a_type = AT_BASE; 193 esd.ai[i++].a_v = (ap ? ap->arg_interp : 0); 194 195 esd.ai[i].a_type = AT_FLAGS; 196 esd.ai[i++].a_v = 0; 197 198 esd.ai[i].a_type = AT_ENTRY; 199 esd.ai[i++].a_v = (ap ? ap->arg_entry : eh->e_entry); 200 201 esd.ai[i].a_type = LINUX_AT_EGID; 202 esd.ai[i++].a_v = ((vap->va_mode & S_ISGID) ? 203 vap->va_gid : kauth_cred_getegid(l->l_cred)); 204 205 esd.ai[i].a_type = LINUX_AT_GID; 206 esd.ai[i++].a_v = kauth_cred_getgid(l->l_cred); 207 208 esd.ai[i].a_type = LINUX_AT_EUID; 209 esd.ai[i++].a_v = ((vap->va_mode & S_ISUID) ? 210 vap->va_uid : kauth_cred_geteuid(l->l_cred)); 211 212 esd.ai[i].a_type = LINUX_AT_UID; 213 esd.ai[i++].a_v = kauth_cred_getuid(l->l_cred); 214 215 esd.ai[i].a_type = LINUX_AT_SECURE; 216 esd.ai[i++].a_v = 0; 217 218 esd.ai[i].a_type = LINUX_AT_PLATFORM; 219 esd.ai[i++].a_v = NETBSD32PTR32I(&esdp->hw_platform[0]); 220 221 esd.ai[i].a_type = AT_NULL; 222 esd.ai[i++].a_v = 0; 223 224 #ifdef DEBUG_LINUX 225 if (i != LINUX32_ELF_AUX_ENTRIES) { 226 printf("linux32_elf32_copyargs: %d Aux entries\n", i); 227 return EINVAL; 228 } 229 #endif 230 231 memcpy(esd.kernel_vsyscall, linux32_kernel_vsyscall, 232 sizeof(linux32_kernel_vsyscall)); 233 234 memcpy(&esd.elfhdr, eh, sizeof(*eh)); 235 236 strcpy(esd.hw_platform, LINUX32_PLATFORM); 237 238 if (ap) { 239 free((char *)ap, M_TEMP); 240 pack->ep_emul_arg = NULL; 241 } 242 243 /* 244 * Copy out the ELF auxiliary table and hw platform name 245 */ 246 if ((error = copyout(&esd, esdp, sizeof(esd))) != 0) 247 return error; 248 *stackp += sizeof(esd); 249 return 0; 250 } 251 252
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