sys/compat/linux/arch/amd64/linux_exec_machdep.c

   1 /*      $NetBSD: linux_exec_machdep.c,v 1.15 2009/03/15 15:55:51 cegger 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 1.15 2009/03/15 15:55:51 cegger 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/common/linux_ipc.h>
  71 #include <compat/linux/common/linux_sem.h>
  72 #include <compat/linux/linux_syscallargs.h>
  73
  74 int
  75 linux_exec_setup_stack(struct lwp *l, struct exec_package *epp)
  76 {
  77         u_long max_stack_size;
  78         u_long access_linear_min, access_size;
  79         u_long noaccess_linear_min, noaccess_size;
  80
  81 #ifndef USRSTACK32
  82 #define USRSTACK32      (0x00000000ffffffffL & ~PGOFSET)
  83 #endif
  84
  85         if (epp->ep_flags & EXEC_32) {
  86                 epp->ep_minsaddr = USRSTACK32;
  87                 max_stack_size = MAXSSIZ;
  88                 if (epp->ep_minsaddr > LINUX_USRSTACK32)
  89                         epp->ep_minsaddr = LINUX_USRSTACK32;
  90         } else {
  91                 epp->ep_minsaddr = USRSTACK;
  92                 max_stack_size = MAXSSIZ;
  93                 if (epp->ep_minsaddr > LINUX_USRSTACK)
  94                         epp->ep_minsaddr = LINUX_USRSTACK;
  95
  96         }
  97
  98         epp->ep_maxsaddr = (u_long)STACK_GROW(epp->ep_minsaddr,
  99                 max_stack_size);
 100         epp->ep_ssize = l->l_proc->p_rlimit[RLIMIT_STACK].rlim_cur;
 101
 102         /*
 103          * set up commands for stack.  note that this takes *two*, one to
 104          * map the part of the stack which we can access, and one to map
 105          * the part which we can't.
 106          *
 107          * arguably, it could be made into one, but that would require the
 108          * addition of another mapping proc, which is unnecessary
 109          */
 110         access_size = epp->ep_ssize;
 111         access_linear_min = (u_long)STACK_ALLOC(epp->ep_minsaddr, access_size);
 112         noaccess_size = max_stack_size - access_size;
 113         noaccess_linear_min = (u_long)STACK_ALLOC(STACK_GROW(epp->ep_minsaddr,
 114             access_size), noaccess_size);
 115         if (noaccess_size > 0) {
 116                 NEW_VMCMD2(&epp->ep_vmcmds, vmcmd_map_zero, noaccess_size,
 117                     noaccess_linear_min, NULLVP, 0, VM_PROT_NONE, VMCMD_STACK);
 118         }
 119         KASSERT(access_size > 0);
 120         NEW_VMCMD2(&epp->ep_vmcmds, vmcmd_map_zero, access_size,
 121             access_linear_min, NULLVP, 0, VM_PROT_READ | VM_PROT_WRITE,
 122             VMCMD_STACK);
 123
 124         return 0;
 125 }
 126
 127 int
 128 ELFNAME2(linux,copyargs)(struct lwp *l, struct exec_package *pack,
 129         struct ps_strings *arginfo, char **stackp, void *argp)
 130 {
 131         struct linux_extra_stack_data64 *esdp, esd;
 132         struct elf_args *ap;
 133         struct vattr *vap;
 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 = ((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 = (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
 255 #ifdef LINUX_NPTL
 256 int
 257 linux_init_thread_area(struct lwp *l, struct lwp *l2)
 258 {
 259         register_t retval;
 260         struct linux_sys_arch_prctl_args uap;
 261         struct trapframe *tf = l2->l_md.md_regs;
 262
 263         SCARG(&uap, code) = LINUX_ARCH_SET_FS;
 264         SCARG(&uap, addr) = tf->tf_r8;
 265         return linux_sys_arch_prctl(l2, &uap, &retval);
 266 }
 267 #endif