linux_exec_machdep.c revision 1.13
1 /* $NetBSD: linux_exec_machdep.c,v 1.13 2008/10/28 18:37:41 christos 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 1.13 2008/10/28 18:37:41 christos 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/kauth.h> 54 55 #include <sys/cpu.h> 56 #include <machine/vmparam.h> 57 #include <sys/syscallargs.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_machdep.h> 64 #include <compat/linux/common/linux_util.h> 65 #include <compat/linux/common/linux_ioctl.h> 66 #include <compat/linux/common/linux_hdio.h> 67 #include <compat/linux/common/linux_exec.h> 68 #include <compat/linux/common/linux_errno.h> 69 #include <compat/linux/common/linux_prctl.h> 70 #include <compat/linux/linux_syscallargs.h> 71 72 int 73 linux_exec_setup_stack(struct lwp *l, struct exec_package *epp) 74 { 75 u_long max_stack_size; 76 u_long access_linear_min, access_size; 77 u_long noaccess_linear_min, noaccess_size; 78 79 #ifndef USRSTACK32 80 #define USRSTACK32 (0x00000000ffffffffL & ~PGOFSET) 81 #endif 82 83 if (epp->ep_flags & EXEC_32) { 84 epp->ep_minsaddr = USRSTACK32; 85 max_stack_size = MAXSSIZ; 86 if (epp->ep_minsaddr > LINUX_USRSTACK32) 87 epp->ep_minsaddr = LINUX_USRSTACK32; 88 } else { 89 epp->ep_minsaddr = USRSTACK; 90 max_stack_size = MAXSSIZ; 91 if (epp->ep_minsaddr > LINUX_USRSTACK) 92 epp->ep_minsaddr = LINUX_USRSTACK; 93 94 } 95 96 epp->ep_maxsaddr = (u_long)STACK_GROW(epp->ep_minsaddr, 97 max_stack_size); 98 epp->ep_ssize = l->l_proc->p_rlimit[RLIMIT_STACK].rlim_cur; 99 100 /* 101 * set up commands for stack. note that this takes *two*, one to 102 * map the part of the stack which we can access, and one to map 103 * the part which we can't. 104 * 105 * arguably, it could be made into one, but that would require the 106 * addition of another mapping proc, which is unnecessary 107 */ 108 access_size = epp->ep_ssize; 109 access_linear_min = (u_long)STACK_ALLOC(epp->ep_minsaddr, access_size); 110 noaccess_size = max_stack_size - access_size; 111 noaccess_linear_min = (u_long)STACK_ALLOC(STACK_GROW(epp->ep_minsaddr, 112 access_size), noaccess_size); 113 if (noaccess_size > 0) { 114 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, noaccess_size, 115 noaccess_linear_min, NULLVP, 0, VM_PROT_NONE); 116 } 117 KASSERT(access_size > 0); 118 NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, access_size, 119 access_linear_min, NULLVP, 0, VM_PROT_READ | VM_PROT_WRITE); 120 121 return 0; 122 } 123 124 int 125 ELFNAME2(linux,copyargs)(l, pack, arginfo, stackp, argp) 126 struct lwp *l; 127 struct exec_package *pack; 128 struct ps_strings *arginfo; 129 char **stackp; 130 void *argp; 131 { 132 struct linux_extra_stack_data64 *esdp, esd; 133 struct elf_args *ap; 134 struct vattr *vap; 135 Elf_Ehdr *eh; 136 Elf_Phdr *ph; 137 u_long phsize; 138 Elf_Addr phdr = 0; 139 int error; 140 int i; 141 142 if ((error = copyargs(l, pack, arginfo, stackp, argp)) != 0) 143 return error; 144 145 /* 146 * Push extra arguments on the stack needed by dynamically 147 * linked binaries and static binaries as well. 148 */ 149 memset(&esd, 0, sizeof(esd)); 150 esdp = (struct linux_extra_stack_data64 *)(*stackp); 151 ap = (struct elf_args *)pack->ep_emul_arg; 152 vap = pack->ep_vap; 153 eh = (Elf_Ehdr *)pack->ep_hdr; 154 155 /* 156 * We forgot this, so we ned to reload it now. XXX keep track of it? 157 */ 158 if (ap == NULL) { 159 phsize = eh->e_phnum * sizeof(Elf_Phdr); 160 ph = (Elf_Phdr *)malloc(phsize, M_TEMP, M_WAITOK); 161 error = exec_read_from(l, pack->ep_vp, eh->e_phoff, ph, phsize); 162 if (error != 0) { 163 for (i = 0; i < eh->e_phnum; i++) { 164 if (ph[i].p_type == PT_PHDR) { 165 phdr = ph[i].p_vaddr; 166 break; 167 } 168 } 169 } 170 free(ph, M_TEMP); 171 } 172 173 174 /* 175 * The exec_package doesn't have a proc pointer and it's not 176 * exactly trivial to add one since the credentials are 177 * changing. XXX Linux uses curlwp's credentials. 178 * Why can't we use them too? 179 */ 180 181 i = 0; 182 esd.ai[i].a_type = LINUX_AT_HWCAP; 183 esd.ai[i++].a_v = rcr4(); 184 185 esd.ai[i].a_type = AT_PAGESZ; 186 esd.ai[i++].a_v = PAGE_SIZE; 187 188 esd.ai[i].a_type = LINUX_AT_CLKTCK; 189 esd.ai[i++].a_v = hz; 190 191 esd.ai[i].a_type = AT_PHDR; 192 esd.ai[i++].a_v = (ap ? ap->arg_phaddr: phdr); 193 194 esd.ai[i].a_type = AT_PHENT; 195 esd.ai[i++].a_v = (ap ? ap->arg_phentsize : eh->e_phentsize); 196 197 esd.ai[i].a_type = AT_PHNUM; 198 esd.ai[i++].a_v = (ap ? ap->arg_phnum : eh->e_phnum); 199 200 esd.ai[i].a_type = AT_BASE; 201 esd.ai[i++].a_v = (ap ? ap->arg_interp : 0); 202 203 esd.ai[i].a_type = AT_FLAGS; 204 esd.ai[i++].a_v = 0; 205 206 esd.ai[i].a_type = AT_ENTRY; 207 esd.ai[i++].a_v = (ap ? ap->arg_entry : eh->e_entry); 208 209 esd.ai[i].a_type = LINUX_AT_EGID; 210 esd.ai[i++].a_v = ((vap->va_mode & S_ISGID) ? 211 vap->va_gid : kauth_cred_getegid(l->l_cred)); 212 213 esd.ai[i].a_type = LINUX_AT_GID; 214 esd.ai[i++].a_v = kauth_cred_getgid(l->l_cred); 215 216 esd.ai[i].a_type = LINUX_AT_EUID; 217 esd.ai[i++].a_v = ((vap->va_mode & S_ISUID) ? 218 vap->va_uid : kauth_cred_geteuid(l->l_cred)); 219 220 esd.ai[i].a_type = LINUX_AT_UID; 221 esd.ai[i++].a_v = kauth_cred_getuid(l->l_cred); 222 223 esd.ai[i].a_type = LINUX_AT_SECURE; 224 esd.ai[i++].a_v = 0; 225 226 esd.ai[i].a_type = LINUX_AT_PLATFORM; 227 esd.ai[i++].a_v = (Elf_Addr)&esdp->hw_platform[0]; 228 229 esd.ai[i].a_type = AT_NULL; 230 esd.ai[i++].a_v = 0; 231 232 #ifdef DEBUG_LINUX 233 if (i != LINUX_ELF_AUX_ENTRIES) { 234 printf("linux_elf64_copyargs: %d Aux entries\n", i); 235 return EINVAL; 236 } 237 #endif 238 239 strcpy(esd.hw_platform, LINUX_PLATFORM); 240 241 if (ap) { 242 free((char *)ap, M_TEMP); 243 pack->ep_emul_arg = NULL; 244 } 245 246 /* 247 * Copy out the ELF auxiliary table and hw platform name 248 */ 249 if ((error = copyout(&esd, esdp, sizeof(esd))) != 0) 250 return error; 251 *stackp += sizeof(esd); 252 253 return 0; 254 } 255 256 #ifdef LINUX_NPTL 257 int 258 linux_init_thread_area(struct lwp *l, struct lwp *l2) 259 { 260 register_t retval; 261 struct linux_sys_arch_prctl_args uap; 262 struct trapframe *tf = l2->l_md.md_regs; 263 264 SCARG(&uap, code) = LINUX_ARCH_SET_FS; 265 SCARG(&uap, addr) = tf->tf_r8; 266 return linux_sys_arch_prctl(l2, &uap, &retval); 267 } 268 #endif 269
Indexes created Tue Sep 23 20:09:58 GMT 2025