linux32_exec_elf32.c revision 1.7.32.2
1 /* $NetBSD: linux32_exec_elf32.c,v 1.7.32.2 2009/05/04 08:12:23 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 1.7.32.2 2009/05/04 08:12:23 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)(struct lwp *l, struct exec_package *epp, 69 void *eh, char *itp, vaddr_t *pos) 70 { 71 int error; 72 73 if (((error = ELFNAME2(linux,signature)(l, epp, eh, itp)) != 0) && 74 #ifdef LINUX32_GCC_SIGNATURE 75 ((error = ELFNAME2(linux,gcc_signature)(l, epp, eh)) != 0) && 76 #endif 77 #ifdef LINUX32_ATEXIT_SIGNATURE 78 ((error = ELFNAME2(linux,atexit_signature)(l, epp, eh)) != 0) && 79 #endif 80 #ifdef LINUX32_DEBUGLINK_SIGNATURE 81 ((error = ELFNAME2(linux,debuglink_signature)(l, epp, eh)) != 0) && 82 #endif 83 1) 84 return error; 85 86 if (itp) { 87 if ((error = emul_find_interp(l, epp, itp))) 88 return (error); 89 } 90 #if 0 91 DPRINTF(("linux32_probe: returning 0\n")); 92 #endif 93 94 epp->ep_flags |= EXEC_32; 95 epp->ep_vm_minaddr = VM_MIN_ADDRESS; 96 epp->ep_vm_maxaddr = USRSTACK32; 97 98 return 0; 99 } 100 101 /* round up and down to page boundaries. */ 102 #define ELF_ROUND(a, b) (((a) + (b) - 1) & ~((b) - 1)) 103 #define ELF_TRUNC(a, b) ((a) & ~((b) - 1)) 104 105 /* 106 * Copy arguments onto the stack in the normal way, but add some 107 * extra information in case of dynamic binding. 108 */ 109 int 110 linux32_elf32_copyargs(struct lwp *l, struct exec_package *pack, 111 struct ps_strings *arginfo, char **stackp, void *argp) 112 { 113 struct linux32_extra_stack_data *esdp, esd; 114 struct elf_args *ap; 115 struct vattr *vap; 116 Elf_Ehdr *eh; 117 Elf_Phdr *ph; 118 Elf_Addr phdr = 0; 119 u_long phsize; 120 int error; 121 int i; 122 123 if ((error = netbsd32_copyargs(l, pack, arginfo, stackp, argp)) != 0) 124 return error; 125 126 /* 127 * Push extra arguments on the stack needed by dynamically 128 * linked binaries and static binaries as well. 129 */ 130 memset(&esd, 0, sizeof(esd)); 131 esdp = (struct linux32_extra_stack_data *)(*stackp); 132 ap = (struct elf_args *)pack->ep_emul_arg; 133 vap = pack->ep_vap; 134 eh = (Elf_Ehdr *)pack->ep_hdr; 135 136 /* 137 * We forgot this, so we ned to reload it now. XXX keep track of it? 138 */ 139 if (ap == NULL) { 140 phsize = eh->e_phnum * sizeof(Elf_Phdr); 141 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 142 error = exec_read_from(l, pack->ep_vp, eh->e_phoff, ph, phsize); 143 if (error != 0) { 144 for (i = 0; i < eh->e_phnum; i++) { 145 if (ph[i].p_type == PT_PHDR) { 146 phdr = ph[i].p_vaddr; 147 break; 148 } 149 } 150 } 151 free(ph, M_TEMP); 152 } 153 154 155 /* 156 * The exec_package doesn't have a proc pointer and it's not 157 * exactly trivial to add one since the credentials are 158 * changing. XXX Linux uses curlwp's credentials. 159 * Why can't we use them too? XXXad we do now; what's different 160 * about Linux's LWP creds? 161 */ 162 163 i = 0; 164 esd.ai[i].a_type = LINUX_AT_SYSINFO; 165 esd.ai[i++].a_v = NETBSD32PTR32I(&esdp->kernel_vsyscall[0]); 166 167 esd.ai[i].a_type = LINUX_AT_SYSINFO_EHDR; 168 esd.ai[i++].a_v = NETBSD32PTR32I(&esdp->elfhdr); 169 170 esd.ai[i].a_type = LINUX_AT_HWCAP; 171 esd.ai[i++].a_v = LINUX32_CPUCAP; 172 173 esd.ai[i].a_type = AT_PAGESZ; 174 esd.ai[i++].a_v = PAGE_SIZE; 175 176 esd.ai[i].a_type = LINUX_AT_CLKTCK; 177 esd.ai[i++].a_v = hz; 178 179 esd.ai[i].a_type = AT_PHDR; 180 esd.ai[i++].a_v = (ap ? ap->arg_phaddr: phdr); 181 182 esd.ai[i].a_type = AT_PHENT; 183 esd.ai[i++].a_v = (ap ? ap->arg_phentsize : eh->e_phentsize); 184 185 esd.ai[i].a_type = AT_PHNUM; 186 esd.ai[i++].a_v = (ap ? ap->arg_phnum : eh->e_phnum); 187 188 esd.ai[i].a_type = AT_BASE; 189 esd.ai[i++].a_v = (ap ? ap->arg_interp : 0); 190 191 esd.ai[i].a_type = AT_FLAGS; 192 esd.ai[i++].a_v = 0; 193 194 esd.ai[i].a_type = AT_ENTRY; 195 esd.ai[i++].a_v = (ap ? ap->arg_entry : eh->e_entry); 196 197 esd.ai[i].a_type = LINUX_AT_EGID; 198 esd.ai[i++].a_v = ((vap->va_mode & S_ISGID) ? 199 vap->va_gid : kauth_cred_getegid(l->l_cred)); 200 201 esd.ai[i].a_type = LINUX_AT_GID; 202 esd.ai[i++].a_v = kauth_cred_getgid(l->l_cred); 203 204 esd.ai[i].a_type = LINUX_AT_EUID; 205 esd.ai[i++].a_v = ((vap->va_mode & S_ISUID) ? 206 vap->va_uid : kauth_cred_geteuid(l->l_cred)); 207 208 esd.ai[i].a_type = LINUX_AT_UID; 209 esd.ai[i++].a_v = kauth_cred_getuid(l->l_cred); 210 211 esd.ai[i].a_type = LINUX_AT_SECURE; 212 esd.ai[i++].a_v = 0; 213 214 esd.ai[i].a_type = LINUX_AT_PLATFORM; 215 esd.ai[i++].a_v = NETBSD32PTR32I(&esdp->hw_platform[0]); 216 217 esd.ai[i].a_type = AT_NULL; 218 esd.ai[i++].a_v = 0; 219 220 #ifdef DEBUG_LINUX 221 if (i != LINUX32_ELF_AUX_ENTRIES) { 222 printf("linux32_elf32_copyargs: %d Aux entries\n", i); 223 return EINVAL; 224 } 225 #endif 226 227 memcpy(esd.kernel_vsyscall, linux32_kernel_vsyscall, 228 sizeof(linux32_kernel_vsyscall)); 229 230 memcpy(&esd.elfhdr, eh, sizeof(*eh)); 231 232 strcpy(esd.hw_platform, LINUX32_PLATFORM); 233 234 if (ap) { 235 free((char *)ap, M_TEMP); 236 pack->ep_emul_arg = NULL; 237 } 238 239 /* 240 * Copy out the ELF auxiliary table and hw platform name 241 */ 242 if ((error = copyout(&esd, esdp, sizeof(esd))) != 0) 243 return error; 244 *stackp += sizeof(esd); 245 return 0; 246 } 247 248
Indexes created Tue Sep 30 20:09:53 GMT 2025