linux_exec_machdep.c revision 1.6
1 /* $NetBSD: linux_exec_machdep.c,v 1.6 2006/05/14 21:24:49 elad Exp $ */ 2 3 /*- 4 * Copyright (c) 2005 Emmanuel Dreyfus, all rights reserved 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Emmanuel Dreyfus 17 * 4. The name of the author may not be used to endorse or promote 18 * products derived from this software without specific prior written 19 * permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE THE AUTHOR AND CONTRIBUTORS ``AS IS'' 22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 23 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS 25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 31 * POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: linux_exec_machdep.c,v 1.6 2006/05/14 21:24:49 elad Exp $"); 36 37 #ifdef __amd64__ 38 #define ELFSIZE 64 39 #endif 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/resource.h> 45 #include <sys/proc.h> 46 #include <sys/conf.h> 47 #include <sys/malloc.h> 48 #include <sys/exec_elf.h> 49 #include <sys/vnode.h> 50 #include <sys/lwp.h> 51 #include <sys/exec.h> 52 #include <sys/stat.h> 53 #include <sys/exec_elf.h> 54 55 #include <machine/cpu.h> 56 #include <machine/vmparam.h> 57 58 #include <uvm/uvm.h> 59 60 #include <compat/linux/common/linux_types.h> 61 #include <compat/linux/common/linux_signal.h> 62 #include <compat/linux/common/linux_util.h> 63 #include <compat/linux/common/linux_ioctl.h> 64 #include <compat/linux/common/linux_hdio.h> 65 #include <compat/linux/common/linux_exec.h> 66 #include <compat/linux/common/linux_machdep.h> 67 #include <compat/linux/common/linux_errno.h> 68 69 int 70 linux_exec_setup_stack(struct lwp *l, struct exec_package *epp) 71 { 72 u_long max_stack_size; 73 u_long access_linear_min, access_size; 74 u_long noaccess_linear_min, noaccess_size; 75 76 #ifndef USRSTACK32 77 #define USRSTACK32 (0x00000000ffffffffL & ~PGOFSET) 78 #endif 79 80 if (epp->ep_flags & EXEC_32) { 81 epp->ep_minsaddr = USRSTACK32; 82 max_stack_size = MAXSSIZ; 83 if (epp->ep_minsaddr > LINUX_USRSTACK32) 84 epp->ep_minsaddr = LINUX_USRSTACK32; 85 } else { 86 epp->ep_minsaddr = USRSTACK; 87 max_stack_size = MAXSSIZ; 88 if (epp->ep_minsaddr > LINUX_USRSTACK) 89 epp->ep_minsaddr = LINUX_USRSTACK; 90 91 } 92 93 epp->ep_maxsaddr = (u_long)STACK_GROW(epp->ep_minsaddr, 94 max_stack_size); 95 epp->ep_ssize = l->l_proc->p_rlimit[RLIMIT_STACK].rlim_cur; 96 97 /* 98 * set up commands for stack. note that this takes *two*, one to 99 * map the part of the stack which we can access, and one to map 100 * the part which we can't. 101 * 102 * arguably, it could be made into one, but that would require the 103 * addition of another mapping proc, which is unnecessary 104 */ 105 access_size = epp->ep_ssize; 106 access_linear_min = (u_long)STACK_ALLOC(epp->ep_minsaddr, access_size); 107 noaccess_size = max_stack_size - access_size; 108 noaccess_linear_min = (u_long)STACK_ALLOC(STACK_GROW(epp->ep_minsaddr, 109 access_size), noaccess_size); 110 if (noaccess_size > 0) { 111 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, noaccess_size, 112 noaccess_linear_min, NULLVP, 0, VM_PROT_NONE); 113 } 114 KASSERT(access_size > 0); 115 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, access_size, 116 access_linear_min, NULLVP, 0, VM_PROT_READ | VM_PROT_WRITE); 117 118 return 0; 119 } 120 121 int 122 ELFNAME2(linux,copyargs)(l, pack, arginfo, stackp, argp) 123 struct lwp *l; 124 struct exec_package *pack; 125 struct ps_strings *arginfo; 126 char **stackp; 127 void *argp; 128 { 129 struct linux_extra_stack_data64 *esdp, esd; 130 struct elf_args *ap; 131 struct vattr *vap; 132 struct proc *p = l->l_proc; 133 Elf_Ehdr *eh; 134 Elf_Phdr *ph; 135 u_long phsize; 136 Elf_Addr phdr = 0; 137 int error; 138 int i; 139 140 if ((error = copyargs(l, pack, arginfo, stackp, argp)) != 0) 141 return error; 142 143 /* 144 * Push extra arguments on the stack needed by dynamically 145 * linked binaries and static binaries as well. 146 */ 147 memset(&esd, 0, sizeof(esd)); 148 esdp = (struct linux_extra_stack_data64 *)(*stackp); 149 ap = (struct elf_args *)pack->ep_emul_arg; 150 vap = pack->ep_vap; 151 eh = (Elf_Ehdr *)pack->ep_hdr; 152 153 /* 154 * We forgot this, so we ned to reload it now. XXX keep track of it? 155 */ 156 if (ap == NULL) { 157 phsize = eh->e_phnum * sizeof(Elf_Phdr); 158 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 159 error = exec_read_from(l, pack->ep_vp, eh->e_phoff, ph, phsize); 160 if (error != 0) { 161 for (i = 0; i < eh->e_phnum; i++) { 162 if (ph[i].p_type == PT_PHDR) { 163 phdr = ph[i].p_vaddr; 164 break; 165 } 166 } 167 } 168 free(ph, M_TEMP); 169 } 170 171 172 /* 173 * The exec_package doesn't have a proc pointer and it's not 174 * exactly trivial to add one since the credentials are 175 * changing. XXX Linux uses curlwp's credentials. 176 * Why can't we use them too? 177 */ 178 179 i = 0; 180 esd.ai[i].a_type = LINUX_AT_HWCAP; 181 esd.ai[i++].a_v = rcr4(); 182 183 esd.ai[i].a_type = AT_PAGESZ; 184 esd.ai[i++].a_v = PAGE_SIZE; 185 186 esd.ai[i].a_type = LINUX_AT_CLKTCK; 187 esd.ai[i++].a_v = hz; 188 189 esd.ai[i].a_type = AT_PHDR; 190 esd.ai[i++].a_v = (ap ? ap->arg_phaddr: phdr); 191 192 esd.ai[i].a_type = AT_PHENT; 193 esd.ai[i++].a_v = (ap ? ap->arg_phentsize : eh->e_phentsize); 194 195 esd.ai[i].a_type = AT_PHNUM; 196 esd.ai[i++].a_v = (ap ? ap->arg_phnum : eh->e_phnum); 197 198 esd.ai[i].a_type = AT_BASE; 199 esd.ai[i++].a_v = (ap ? ap->arg_interp : 0); 200 201 esd.ai[i].a_type = AT_FLAGS; 202 esd.ai[i++].a_v = 0; 203 204 esd.ai[i].a_type = AT_ENTRY; 205 esd.ai[i++].a_v = (ap ? ap->arg_entry : eh->e_entry); 206 207 esd.ai[i].a_type = LINUX_AT_EGID; 208 esd.ai[i++].a_v = 209 ((vap->va_mode & S_ISGID) ? vap->va_gid : kauth_cred_getegid(p->p_cred)); 210 211 esd.ai[i].a_type = LINUX_AT_GID; 212 esd.ai[i++].a_v = kauth_cred_getgid(p->p_cred); 213 214 esd.ai[i].a_type = LINUX_AT_EUID; 215 esd.ai[i++].a_v = 216 ((vap->va_mode & S_ISUID) ? vap->va_uid : kauth_cred_geteuid(p->p_cred)); 217 218 esd.ai[i].a_type = LINUX_AT_UID; 219 esd.ai[i++].a_v = kauth_cred_getuid(p->p_cred); 220 221 esd.ai[i].a_type = LINUX_AT_SECURE; 222 esd.ai[i++].a_v = 0; 223 224 esd.ai[i].a_type = LINUX_AT_PLATFORM; 225 esd.ai[i++].a_v = (Elf_Addr)&esdp->hw_platform[0]; 226 227 esd.ai[i].a_type = AT_NULL; 228 esd.ai[i++].a_v = 0; 229 230 #ifdef DEBUG_LINUX 231 if (i != LINUX_ELF_AUX_ENTRIES) { 232 printf("linux_elf64_copyargs: %d Aux entries\n", i); 233 return EINVAL; 234 } 235 #endif 236 237 strcpy(esd.hw_platform, LINUX_PLATFORM); 238 239 if (ap) { 240 free((char *)ap, M_TEMP); 241 pack->ep_emul_arg = NULL; 242 } 243 244 /* 245 * Copy out the ELF auxiliary table and hw platform name 246 */ 247 if ((error = copyout(&esd, esdp, sizeof(esd))) != 0) 248 return error; 249 *stackp += sizeof(esd); 250 251 return 0; 252 } 253
Indexes created Mon Sep 22 05:09:51 GMT 2025