1 /* $NetBSD: linux_exec_machdep.c,v 1.7 2006/05/15 13:12:13 yamt 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 1.7 2006/05/15 13:12:13 yamt 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 #include <sys/kauth.h> 55 56 #include <machine/cpu.h> 57 #include <machine/vmparam.h> 58 59 #include <uvm/uvm.h> 60 61 #include <compat/linux/common/linux_types.h> 62 #include <compat/linux/common/linux_signal.h> 63 #include <compat/linux/common/linux_util.h> 64 #include <compat/linux/common/linux_ioctl.h> 65 #include <compat/linux/common/linux_hdio.h> 66 #include <compat/linux/common/linux_exec.h> 67 #include <compat/linux/common/linux_machdep.h> 68 #include <compat/linux/common/linux_errno.h> 69 70 int 71 linux_exec_setup_stack(struct lwp *l, struct exec_package *epp) 72 { 73 u_long max_stack_size; 74 u_long access_linear_min, access_size; 75 u_long noaccess_linear_min, noaccess_size; 76 77 #ifndef USRSTACK32 78 #define USRSTACK32 (0x00000000ffffffffL & ~PGOFSET) 79 #endif 80 81 if (epp->ep_flags & EXEC_32) { 82 epp->ep_minsaddr = USRSTACK32; 83 max_stack_size = MAXSSIZ; 84 if (epp->ep_minsaddr > LINUX_USRSTACK32) 85 epp->ep_minsaddr = LINUX_USRSTACK32; 86 } else { 87 epp->ep_minsaddr = USRSTACK; 88 max_stack_size = MAXSSIZ; 89 if (epp->ep_minsaddr > LINUX_USRSTACK) 90 epp->ep_minsaddr = LINUX_USRSTACK; 91 92 } 93 94 epp->ep_maxsaddr = (u_long)STACK_GROW(epp->ep_minsaddr, 95 max_stack_size); 96 epp->ep_ssize = l->l_proc->p_rlimit[RLIMIT_STACK].rlim_cur; 97 98 /* 99 * set up commands for stack. note that this takes *two*, one to 100 * map the part of the stack which we can access, and one to map 101 * the part which we can't. 102 * 103 * arguably, it could be made into one, but that would require the 104 * addition of another mapping proc, which is unnecessary 105 */ 106 access_size = epp->ep_ssize; 107 access_linear_min = (u_long)STACK_ALLOC(epp->ep_minsaddr, access_size); 108 noaccess_size = max_stack_size - access_size; 109 noaccess_linear_min = (u_long)STACK_ALLOC(STACK_GROW(epp->ep_minsaddr, 110 access_size), noaccess_size); 111 if (noaccess_size > 0) { 112 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, noaccess_size, 113 noaccess_linear_min, NULLVP, 0, VM_PROT_NONE); 114 } 115 KASSERT(access_size > 0); 116 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, access_size, 117 access_linear_min, NULLVP, 0, VM_PROT_READ | VM_PROT_WRITE); 118 119 return 0; 120 } 121 122 int 123 ELFNAME2(linux,copyargs)(l, pack, arginfo, stackp, argp) 124 struct lwp *l; 125 struct exec_package *pack; 126 struct ps_strings *arginfo; 127 char **stackp; 128 void *argp; 129 { 130 struct linux_extra_stack_data64 *esdp, esd; 131 struct elf_args *ap; 132 struct vattr *vap; 133 struct proc *p = l->l_proc; 134 Elf_Ehdr *eh; 135 Elf_Phdr *ph; 136 u_long phsize; 137 Elf_Addr phdr = 0; 138 int error; 139 int i; 140 141 if ((error = copyargs(l, pack, arginfo, stackp, argp)) != 0) 142 return error; 143 144 /* 145 * Push extra arguments on the stack needed by dynamically 146 * linked binaries and static binaries as well. 147 */ 148 memset(&esd, 0, sizeof(esd)); 149 esdp = (struct linux_extra_stack_data64 *)(*stackp); 150 ap = (struct elf_args *)pack->ep_emul_arg; 151 vap = pack->ep_vap; 152 eh = (Elf_Ehdr *)pack->ep_hdr; 153 154 /* 155 * We forgot this, so we ned to reload it now. XXX keep track of it? 156 */ 157 if (ap == NULL) { 158 phsize = eh->e_phnum * sizeof(Elf_Phdr); 159 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 160 error = exec_read_from(l, pack->ep_vp, eh->e_phoff, ph, phsize); 161 if (error != 0) { 162 for (i = 0; i < eh->e_phnum; i++) { 163 if (ph[i].p_type == PT_PHDR) { 164 phdr = ph[i].p_vaddr; 165 break; 166 } 167 } 168 } 169 free(ph, M_TEMP); 170 } 171 172 173 /* 174 * The exec_package doesn't have a proc pointer and it's not 175 * exactly trivial to add one since the credentials are 176 * changing. XXX Linux uses curlwp's credentials. 177 * Why can't we use them too? 178 */ 179 180 i = 0; 181 esd.ai[i].a_type = LINUX_AT_HWCAP; 182 esd.ai[i++].a_v = rcr4(); 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 = 210 ((vap->va_mode & S_ISGID) ? vap->va_gid : kauth_cred_getegid(p->p_cred)); 211 212 esd.ai[i].a_type = LINUX_AT_GID; 213 esd.ai[i++].a_v = kauth_cred_getgid(p->p_cred); 214 215 esd.ai[i].a_type = LINUX_AT_EUID; 216 esd.ai[i++].a_v = 217 ((vap->va_mode & S_ISUID) ? vap->va_uid : kauth_cred_geteuid(p->p_cred)); 218 219 esd.ai[i].a_type = LINUX_AT_UID; 220 esd.ai[i++].a_v = kauth_cred_getuid(p->p_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 = (Elf_Addr)&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 != LINUX_ELF_AUX_ENTRIES) { 233 printf("linux_elf64_copyargs: %d Aux entries\n", i); 234 return EINVAL; 235 } 236 #endif 237 238 strcpy(esd.hw_platform, LINUX_PLATFORM); 239 240 if (ap) { 241 free((char *)ap, M_TEMP); 242 pack->ep_emul_arg = NULL; 243 } 244 245 /* 246 * Copy out the ELF auxiliary table and hw platform name 247 */ 248 if ((error = copyout(&esd, esdp, sizeof(esd))) != 0) 249 return error; 250 *stackp += sizeof(esd); 251 252 return 0; 253 } 254