linux32_exec_elf32.c revision 1.7
1 /* $NetBSD: linux32_exec_elf32.c,v 1.7 2007/04/22 08:29:57 dsl 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 1.7 2007/04/22 08:29:57 dsl 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, itp))) 99 return (error); 100 } 101 #if 0 102 DPRINTF(("linux32_probe: returning 0\n")); 103 #endif 104 105 epp->ep_flags |= EXEC_32; 106 epp->ep_vm_minaddr = VM_MIN_ADDRESS; 107 epp->ep_vm_maxaddr = USRSTACK32; 108 109 return 0; 110 } 111 112 /* round up and down to page boundaries. */ 113 #define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1)) 114 #define ELF_TRUNC(a, b) ((a) & ~((b) - 1)) 115 116 /* 117 * Copy arguments onto the stack in the normal way, but add some 118 * extra information in case of dynamic binding. 119 */ 120 int 121 linux32_elf32_copyargs(struct lwp *l, struct exec_package *pack, 122 struct ps_strings *arginfo, char **stackp, void *argp) 123 { 124 struct linux32_extra_stack_data *esdp, esd; 125 struct elf_args *ap; 126 struct vattr *vap; 127 Elf_Ehdr *eh; 128 Elf_Phdr *ph; 129 Elf_Addr phdr = 0; 130 u_long phsize; 131 int error; 132 int i; 133 134 if ((error = netbsd32_copyargs(l, pack, arginfo, stackp, argp)) != 0) 135 return error; 136 137 /* 138 * Push extra arguments on the stack needed by dynamically 139 * linked binaries and static binaries as well. 140 */ 141 memset(&esd, 0, sizeof(esd)); 142 esdp = (struct linux32_extra_stack_data *)(*stackp); 143 ap = (struct elf_args *)pack->ep_emul_arg; 144 vap = pack->ep_vap; 145 eh = (Elf_Ehdr *)pack->ep_hdr; 146 147 /* 148 * We forgot this, so we ned to reload it now. XXX keep track of it? 149 */ 150 if (ap == NULL) { 151 phsize = eh->e_phnum * sizeof(Elf_Phdr); 152 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 153 error = exec_read_from(l, pack->ep_vp, eh->e_phoff, ph, phsize); 154 if (error != 0) { 155 for (i = 0; i < eh->e_phnum; i++) { 156 if (ph[i].p_type == PT_PHDR) { 157 phdr = ph[i].p_vaddr; 158 break; 159 } 160 } 161 } 162 free(ph, M_TEMP); 163 } 164 165 166 /* 167 * The exec_package doesn't have a proc pointer and it's not 168 * exactly trivial to add one since the credentials are 169 * changing. XXX Linux uses curlwp's credentials. 170 * Why can't we use them too? XXXad we do now; what's different 171 * about Linux's LWP creds? 172 */ 173 174 i = 0; 175 esd.ai[i].a_type = LINUX_AT_SYSINFO; 176 esd.ai[i++].a_v = NETBSD32PTR32I(&esdp->kernel_vsyscall[0]); 177 178 esd.ai[i].a_type = LINUX_AT_SYSINFO_EHDR; 179 esd.ai[i++].a_v = NETBSD32PTR32I(&esdp->elfhdr); 180 181 esd.ai[i].a_type = LINUX_AT_HWCAP; 182 esd.ai[i++].a_v = LINUX32_CPUCAP; 183 184 esd.ai[i].a_type = AT_PAGESZ; 185 esd.ai[i++].a_v = PAGE_SIZE; 186 187 esd.ai[i].a_type = LINUX_AT_CLKTCK; 188 esd.ai[i++].a_v = hz; 189 190 esd.ai[i].a_type = AT_PHDR; 191 esd.ai[i++].a_v = (ap ? ap->arg_phaddr: phdr); 192 193 esd.ai[i].a_type = AT_PHENT; 194 esd.ai[i++].a_v = (ap ? ap->arg_phentsize : eh->e_phentsize); 195 196 esd.ai[i].a_type = AT_PHNUM; 197 esd.ai[i++].a_v = (ap ? ap->arg_phnum : eh->e_phnum); 198 199 esd.ai[i].a_type = AT_BASE; 200 esd.ai[i++].a_v = (ap ? ap->arg_interp : 0); 201 202 esd.ai[i].a_type = AT_FLAGS; 203 esd.ai[i++].a_v = 0; 204 205 esd.ai[i].a_type = AT_ENTRY; 206 esd.ai[i++].a_v = (ap ? ap->arg_entry : eh->e_entry); 207 208 esd.ai[i].a_type = LINUX_AT_EGID; 209 esd.ai[i++].a_v = ((vap->va_mode & S_ISGID) ? 210 vap->va_gid : kauth_cred_getegid(l->l_cred)); 211 212 esd.ai[i].a_type = LINUX_AT_GID; 213 esd.ai[i++].a_v = kauth_cred_getgid(l->l_cred); 214 215 esd.ai[i].a_type = LINUX_AT_EUID; 216 esd.ai[i++].a_v = ((vap->va_mode & S_ISUID) ? 217 vap->va_uid : kauth_cred_geteuid(l->l_cred)); 218 219 esd.ai[i].a_type = LINUX_AT_UID; 220 esd.ai[i++].a_v = kauth_cred_getuid(l->l_cred); 221 222 esd.ai[i].a_type = LINUX_AT_SECURE; 223 esd.ai[i++].a_v = 0; 224 225 esd.ai[i].a_type = LINUX_AT_PLATFORM; 226 esd.ai[i++].a_v = NETBSD32PTR32I(&esdp->hw_platform[0]); 227 228 esd.ai[i].a_type = AT_NULL; 229 esd.ai[i++].a_v = 0; 230 231 #ifdef DEBUG_LINUX 232 if (i != LINUX32_ELF_AUX_ENTRIES) { 233 printf("linux32_elf32_copyargs: %d Aux entries\n", i); 234 return EINVAL; 235 } 236 #endif 237 238 memcpy(esd.kernel_vsyscall, linux32_kernel_vsyscall, 239 sizeof(linux32_kernel_vsyscall)); 240 241 memcpy(&esd.elfhdr, eh, sizeof(*eh)); 242 243 strcpy(esd.hw_platform, LINUX32_PLATFORM); 244 245 if (ap) { 246 free((char *)ap, M_TEMP); 247 pack->ep_emul_arg = NULL; 248 } 249 250 /* 251 * Copy out the ELF auxiliary table and hw platform name 252 */ 253 if ((error = copyout(&esd, esdp, sizeof(esd))) != 0) 254 return error; 255 *stackp += sizeof(esd); 256 return 0; 257 } 258 259
Indexes created Mon Sep 22 13:09:51 GMT 2025