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561ff1ec42
* sysdeps/mach/hurd/dl-sysdep.c (__mmap): Do not deallocate memobj_wr when it is MACH_PORT_NULL.
658 lines
18 KiB
C
658 lines
18 KiB
C
/* Operating system support for run-time dynamic linker. Hurd version.
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Copyright (C) 1995-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* In the static library, this is all handled by dl-support.c
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or by the vanilla definitions in the rest of the C library. */
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#ifdef SHARED
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#include <hurd.h>
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#include <link.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <sys/mman.h>
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#include <ldsodefs.h>
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#include <sys/wait.h>
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#include <assert.h>
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#include <sysdep.h>
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#include <mach/mig_support.h>
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#include "hurdstartup.h"
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#include <hurd/lookup.h>
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#include <hurd/auth.h>
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#include <hurd/term.h>
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#include <stdarg.h>
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#include <ctype.h>
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#include <sys/stat.h>
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#include <sys/uio.h>
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#include <entry.h>
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#include <dl-machine.h>
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#include <dl-procinfo.h>
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extern void __mach_init (void);
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extern int _dl_argc;
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extern char **_dl_argv;
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extern char **_environ;
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int __libc_enable_secure = 0;
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rtld_hidden_data_def (__libc_enable_secure)
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int __libc_multiple_libcs = 0; /* Defining this here avoids the inclusion
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of init-first. */
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/* This variable contains the lowest stack address ever used. */
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void *__libc_stack_end = NULL;
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rtld_hidden_data_def(__libc_stack_end)
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#if HP_TIMING_AVAIL
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hp_timing_t _dl_cpuclock_offset;
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#endif
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struct hurd_startup_data *_dl_hurd_data;
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/* This is used only within ld.so, via dl-minimal.c's __errno_location. */
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#undef errno
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int errno attribute_hidden;
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/* Defining these variables here avoids the inclusion of hurdsig.c. */
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unsigned long int __hurd_sigthread_stack_base;
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unsigned long int __hurd_sigthread_stack_end;
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unsigned long int *__hurd_sigthread_variables;
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/* Defining these variables here avoids the inclusion of init-first.c.
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We need to provide temporary storage for the per-thread variables
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of the main user thread here, since it is used for storing the
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`errno' variable. Note that this information is lost once we
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relocate the dynamic linker. */
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static unsigned long int threadvars[_HURD_THREADVAR_MAX];
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unsigned long int __hurd_threadvar_stack_offset
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= (unsigned long int) &threadvars;
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unsigned long int __hurd_threadvar_stack_mask;
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#define FMH defined(__i386__)
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#if ! FMH
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# define fmh() ((void)0)
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# define unfmh() ((void)0)
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#else
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/* XXX loser kludge for vm_map kernel bug */
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#undef ELF_MACHINE_USER_ADDRESS_MASK
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#define ELF_MACHINE_USER_ADDRESS_MASK 0
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static vm_address_t fmha;
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static vm_size_t fmhs;
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static void unfmh(void){
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__vm_deallocate(__mach_task_self(),fmha,fmhs);}
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static void fmh(void) {
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error_t err;int x;vm_offset_t o;mach_port_t p;
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vm_address_t a=0x08000000U,max=VM_MAX_ADDRESS;
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while (!(err=__vm_region(__mach_task_self(),&a,&fmhs,&x,&x,&x,&x,&p,&o))){
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__mach_port_deallocate(__mach_task_self(),p);
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if (a+fmhs>=0x80000000U){
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max=a; break;}
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fmha=a+=fmhs;}
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if (err) assert(err==KERN_NO_SPACE);
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if (!fmha)fmhs=0;else{
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fmhs=max-fmha;
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err = __vm_map (__mach_task_self (),
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&fmha, fmhs, 0, 0, MACH_PORT_NULL, 0, 1,
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VM_PROT_NONE, VM_PROT_NONE, VM_INHERIT_COPY);
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assert_perror(err);}
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}
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/* XXX loser kludge for vm_map kernel bug */
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#endif
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ElfW(Addr)
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_dl_sysdep_start (void **start_argptr,
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void (*dl_main) (const ElfW(Phdr) *phdr, ElfW(Word) phent,
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ElfW(Addr) *user_entry,
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ElfW(auxv_t) *auxv))
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{
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void go (intptr_t *argdata)
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{
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char **p;
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/* Cache the information in various global variables. */
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_dl_argc = *argdata;
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_dl_argv = 1 + (char **) argdata;
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_environ = &_dl_argv[_dl_argc + 1];
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for (p = _environ; *p++;); /* Skip environ pointers and terminator. */
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if ((void *) p == _dl_argv[0])
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{
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static struct hurd_startup_data nodata;
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_dl_hurd_data = &nodata;
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nodata.user_entry = (vm_address_t) ENTRY_POINT;
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}
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else
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_dl_hurd_data = (void *) p;
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__libc_enable_secure = _dl_hurd_data->flags & EXEC_SECURE;
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if (_dl_hurd_data->flags & EXEC_STACK_ARGS &&
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_dl_hurd_data->user_entry == 0)
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_dl_hurd_data->user_entry = (vm_address_t) ENTRY_POINT;
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unfmh(); /* XXX */
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#if 0 /* XXX make this work for real someday... */
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if (_dl_hurd_data->user_entry == (vm_address_t) ENTRY_POINT)
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/* We were invoked as a command, not as the program interpreter.
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The generic ld.so code supports this: it will parse the args
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as "ld.so PROGRAM [ARGS...]". For booting the Hurd, we
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support an additional special syntax:
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ld.so [-LIBS...] PROGRAM [ARGS...]
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Each LIBS word consists of "FILENAME=MEMOBJ";
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for example "-/lib/libc.so=123" says that the contents of
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/lib/libc.so are found in a memory object whose port name
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in our task is 123. */
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while (_dl_argc > 2 && _dl_argv[1][0] == '-' && _dl_argv[1][1] != '-')
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{
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char *lastslash, *memobjname, *p;
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struct link_map *l;
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mach_port_t memobj;
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error_t err;
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++_dl_skip_args;
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--_dl_argc;
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p = _dl_argv++[1] + 1;
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memobjname = strchr (p, '=');
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if (! memobjname)
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_dl_sysdep_fatal ("Bogus library spec: ", p, "\n", NULL);
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*memobjname++ = '\0';
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memobj = 0;
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while (*memobjname != '\0')
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memobj = (memobj * 10) + (*memobjname++ - '0');
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/* Add a user reference on the memory object port, so we will
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still have one after _dl_map_object_from_fd calls our
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`close'. */
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err = __mach_port_mod_refs (__mach_task_self (), memobj,
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MACH_PORT_RIGHT_SEND, +1);
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assert_perror (err);
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lastslash = strrchr (p, '/');
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l = _dl_map_object_from_fd (lastslash ? lastslash + 1 : p, NULL,
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memobj, strdup (p), 0);
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/* Squirrel away the memory object port where it
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can be retrieved by the program later. */
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l->l_info[DT_NULL] = (void *) memobj;
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}
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#endif
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/* Call elf/rtld.c's main program. It will set everything
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up and leave us to transfer control to USER_ENTRY. */
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(*dl_main) ((const ElfW(Phdr) *) _dl_hurd_data->phdr,
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_dl_hurd_data->phdrsz / sizeof (ElfW(Phdr)),
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&_dl_hurd_data->user_entry, NULL);
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/* The call above might screw a few things up.
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First of all, if _dl_skip_args is nonzero, we are ignoring
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the first few arguments. However, if we have no Hurd startup
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data, it is the magical convention that ARGV[0] == P. The
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startup code in init-first.c will get confused if this is not
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the case, so we must rearrange things to make it so. We'll
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overwrite the origional ARGV[0] at P with ARGV[_dl_skip_args].
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Secondly, if we need to be secure, it removes some dangerous
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environment variables. If we have no Hurd startup date this
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changes P (since that's the location after the terminating
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NULL in the list of environment variables). We do the same
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thing as in the first case but make sure we recalculate P.
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If we do have Hurd startup data, we have to move the data
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such that it starts just after the terminating NULL in the
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environment list.
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We use memmove, since the locations might overlap. */
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if (__libc_enable_secure || _dl_skip_args)
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{
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char **newp;
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for (newp = _environ; *newp++;);
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if (_dl_argv[-_dl_skip_args] == (char *) p)
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{
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if ((char *) newp != _dl_argv[0])
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{
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assert ((char *) newp < _dl_argv[0]);
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_dl_argv[0] = memmove ((char *) newp, _dl_argv[0],
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strlen (_dl_argv[0]) + 1);
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}
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}
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else
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{
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if ((void *) newp != _dl_hurd_data)
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memmove (newp, _dl_hurd_data, sizeof (*_dl_hurd_data));
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}
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}
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{
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extern void _dl_start_user (void);
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/* Unwind the stack to ARGDATA and simulate a return from _dl_start
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to the RTLD_START code which will run the user's entry point. */
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RETURN_TO (argdata, &_dl_start_user, _dl_hurd_data->user_entry);
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}
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}
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/* Set up so we can do RPCs. */
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__mach_init ();
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/* Initialize frequently used global variable. */
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GLRO(dl_pagesize) = __getpagesize ();
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#if HP_TIMING_AVAIL
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HP_TIMING_NOW (_dl_cpuclock_offset);
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#endif
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fmh(); /* XXX */
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/* See hurd/hurdstartup.c; this deals with getting information
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from the exec server and slicing up the arguments.
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Then it will call `go', above. */
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_hurd_startup (start_argptr, &go);
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LOSE;
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abort ();
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}
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void
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internal_function
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_dl_sysdep_start_cleanup (void)
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{
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/* Deallocate the reply port and task port rights acquired by
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__mach_init. We are done with them now, and the user will
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reacquire them for himself when he wants them. */
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__mig_dealloc_reply_port (MACH_PORT_NULL);
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__mach_port_deallocate (__mach_task_self (), __mach_host_self_);
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__mach_port_deallocate (__mach_task_self (), __mach_task_self_);
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}
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/* Minimal open/close/mmap implementation sufficient for initial loading of
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shared libraries. These are weak definitions so that when the
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dynamic linker re-relocates itself to be user-visible (for -ldl),
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it will get the user's definition (i.e. usually libc's). */
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/* Open FILE_NAME and return a Hurd I/O for it in *PORT, or return an
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error. If STAT is non-zero, stat the file into that stat buffer. */
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static error_t
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open_file (const char *file_name, int flags,
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mach_port_t *port, struct stat64 *stat)
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{
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enum retry_type doretry;
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char retryname[1024]; /* XXX string_t LOSES! */
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file_t startdir;
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error_t err;
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error_t use_init_port (int which, error_t (*operate) (file_t))
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{
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return (which < _dl_hurd_data->portarraysize
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? ((*operate) (_dl_hurd_data->portarray[which]))
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: EGRATUITOUS);
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}
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file_t get_dtable_port (int fd)
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{
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if ((unsigned int) fd < _dl_hurd_data->dtablesize
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&& _dl_hurd_data->dtable[fd] != MACH_PORT_NULL)
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{
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__mach_port_mod_refs (__mach_task_self (), _dl_hurd_data->dtable[fd],
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MACH_PORT_RIGHT_SEND, +1);
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return _dl_hurd_data->dtable[fd];
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}
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errno = EBADF;
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return MACH_PORT_NULL;
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}
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assert (!(flags & ~(O_READ | O_CLOEXEC)));
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startdir = _dl_hurd_data->portarray[file_name[0] == '/' ?
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INIT_PORT_CRDIR : INIT_PORT_CWDIR];
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while (file_name[0] == '/')
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file_name++;
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err = __dir_lookup (startdir, (char *)file_name, O_RDONLY, 0,
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&doretry, retryname, port);
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if (!err)
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err = __hurd_file_name_lookup_retry (use_init_port, get_dtable_port,
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__dir_lookup, doretry, retryname,
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O_RDONLY, 0, port);
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if (!err && stat)
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{
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err = __io_stat (*port, stat);
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if (err)
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__mach_port_deallocate (__mach_task_self (), *port);
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}
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return err;
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}
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int weak_function
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__open (const char *file_name, int mode, ...)
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{
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mach_port_t port;
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error_t err = open_file (file_name, mode, &port, 0);
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if (err)
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return __hurd_fail (err);
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else
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return (int)port;
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}
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int weak_function
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__close (int fd)
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{
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if (fd != (int) MACH_PORT_NULL)
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__mach_port_deallocate (__mach_task_self (), (mach_port_t) fd);
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return 0;
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}
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__ssize_t weak_function
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__libc_read (int fd, void *buf, size_t nbytes)
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{
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error_t err;
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char *data;
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mach_msg_type_number_t nread;
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data = buf;
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nread = nbytes;
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err = __io_read ((mach_port_t) fd, &data, &nread, -1, nbytes);
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if (err)
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return __hurd_fail (err);
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if (data != buf)
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{
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memcpy (buf, data, nread);
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__vm_deallocate (__mach_task_self (), (vm_address_t) data, nread);
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}
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return nread;
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}
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libc_hidden_weak (__libc_read)
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__ssize_t weak_function
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__libc_write (int fd, const void *buf, size_t nbytes)
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{
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error_t err;
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mach_msg_type_number_t nwrote;
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assert (fd < _hurd_init_dtablesize);
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err = __io_write (_hurd_init_dtable[fd], buf, nbytes, -1, &nwrote);
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if (err)
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return __hurd_fail (err);
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return nwrote;
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}
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libc_hidden_weak (__libc_write)
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/* This is only used for printing messages (see dl-misc.c). */
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__ssize_t weak_function
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__writev (int fd, const struct iovec *iov, int niov)
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{
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if (fd >= _hurd_init_dtablesize)
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{
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errno = EBADF;
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return -1;
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}
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int i;
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size_t total = 0;
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for (i = 0; i < niov; ++i)
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total += iov[i].iov_len;
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if (total != 0)
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{
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char buf[total], *bufp = buf;
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error_t err;
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mach_msg_type_number_t nwrote;
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for (i = 0; i < niov; ++i)
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bufp = (memcpy (bufp, iov[i].iov_base, iov[i].iov_len)
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+ iov[i].iov_len);
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err = __io_write (_hurd_init_dtable[fd], buf, total, -1, &nwrote);
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if (err)
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return __hurd_fail (err);
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return nwrote;
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}
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return 0;
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}
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off64_t weak_function
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__libc_lseek64 (int fd, off64_t offset, int whence)
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{
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error_t err;
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err = __io_seek ((mach_port_t) fd, offset, whence, &offset);
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if (err)
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return __hurd_fail (err);
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return offset;
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}
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__ptr_t weak_function
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__mmap (__ptr_t addr, size_t len, int prot, int flags, int fd, off_t offset)
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{
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error_t err;
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vm_prot_t vmprot;
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vm_address_t mapaddr;
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mach_port_t memobj_rd, memobj_wr;
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vmprot = VM_PROT_NONE;
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if (prot & PROT_READ)
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vmprot |= VM_PROT_READ;
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if (prot & PROT_WRITE)
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vmprot |= VM_PROT_WRITE;
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if (prot & PROT_EXEC)
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vmprot |= VM_PROT_EXECUTE;
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if (flags & MAP_ANON)
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memobj_rd = MACH_PORT_NULL;
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else
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{
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assert (!(flags & MAP_SHARED));
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err = __io_map ((mach_port_t) fd, &memobj_rd, &memobj_wr);
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if (err)
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return __hurd_fail (err), MAP_FAILED;
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if (memobj_wr != MACH_PORT_NULL)
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__mach_port_deallocate (__mach_task_self (), memobj_wr);
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}
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mapaddr = (vm_address_t) addr;
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err = __vm_map (__mach_task_self (),
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&mapaddr, (vm_size_t) len, ELF_MACHINE_USER_ADDRESS_MASK,
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!(flags & MAP_FIXED),
|
||
memobj_rd,
|
||
(vm_offset_t) offset,
|
||
flags & (MAP_COPY|MAP_PRIVATE),
|
||
vmprot, VM_PROT_ALL,
|
||
(flags & MAP_SHARED) ? VM_INHERIT_SHARE : VM_INHERIT_COPY);
|
||
if (err == KERN_NO_SPACE && (flags & MAP_FIXED))
|
||
{
|
||
/* XXX this is not atomic as it is in unix! */
|
||
/* The region is already allocated; deallocate it first. */
|
||
err = __vm_deallocate (__mach_task_self (), mapaddr, len);
|
||
if (! err)
|
||
err = __vm_map (__mach_task_self (),
|
||
&mapaddr, (vm_size_t) len,
|
||
ELF_MACHINE_USER_ADDRESS_MASK,
|
||
!(flags & MAP_FIXED),
|
||
memobj_rd, (vm_offset_t) offset,
|
||
flags & (MAP_COPY|MAP_PRIVATE),
|
||
vmprot, VM_PROT_ALL,
|
||
(flags & MAP_SHARED)
|
||
? VM_INHERIT_SHARE : VM_INHERIT_COPY);
|
||
}
|
||
|
||
if ((flags & MAP_ANON) == 0)
|
||
__mach_port_deallocate (__mach_task_self (), memobj_rd);
|
||
|
||
if (err)
|
||
return __hurd_fail (err), MAP_FAILED;
|
||
return (__ptr_t) mapaddr;
|
||
}
|
||
|
||
int weak_function
|
||
__fxstat64 (int vers, int fd, struct stat64 *buf)
|
||
{
|
||
error_t err;
|
||
|
||
assert (vers == _STAT_VER);
|
||
|
||
err = __io_stat ((mach_port_t) fd, buf);
|
||
if (err)
|
||
return __hurd_fail (err);
|
||
|
||
return 0;
|
||
}
|
||
libc_hidden_def (__fxstat64)
|
||
|
||
int weak_function
|
||
__xstat64 (int vers, const char *file, struct stat64 *buf)
|
||
{
|
||
error_t err;
|
||
mach_port_t port;
|
||
|
||
assert (vers == _STAT_VER);
|
||
|
||
err = open_file (file, 0, &port, buf);
|
||
if (err)
|
||
return __hurd_fail (err);
|
||
|
||
__mach_port_deallocate (__mach_task_self (), port);
|
||
|
||
return 0;
|
||
}
|
||
libc_hidden_def (__xstat64)
|
||
|
||
/* This function is called by the dynamic linker (rtld.c) to check
|
||
whether debugging malloc is allowed even for SUID binaries. This
|
||
stub will always fail, which means that malloc-debugging is always
|
||
disabled for SUID binaries. */
|
||
int weak_function
|
||
__access (const char *file, int type)
|
||
{
|
||
errno = ENOSYS;
|
||
return -1;
|
||
}
|
||
|
||
pid_t weak_function
|
||
__getpid (void)
|
||
{
|
||
pid_t pid, ppid;
|
||
int orphaned;
|
||
|
||
if (__proc_getpids (_dl_hurd_data->portarray[INIT_PORT_PROC],
|
||
&pid, &ppid, &orphaned))
|
||
return -1;
|
||
|
||
return pid;
|
||
}
|
||
|
||
/* This is called only in some strange cases trying to guess a value
|
||
for $ORIGIN for the executable. The dynamic linker copes with
|
||
getcwd failing (dl-object.c), and it's too much hassle to include
|
||
the functionality here. (We could, it just requires duplicating or
|
||
reusing getcwd.c's code but using our special lookup function as in
|
||
`open', above.) */
|
||
char *
|
||
weak_function
|
||
__getcwd (char *buf, size_t size)
|
||
{
|
||
errno = ENOSYS;
|
||
return NULL;
|
||
}
|
||
|
||
void weak_function attribute_hidden
|
||
_exit (int status)
|
||
{
|
||
__proc_mark_exit (_dl_hurd_data->portarray[INIT_PORT_PROC],
|
||
W_EXITCODE (status, 0), 0);
|
||
while (__task_terminate (__mach_task_self ()))
|
||
__mach_task_self_ = (__mach_task_self) ();
|
||
}
|
||
/* We need this alias to satisfy references from libc_pic.a objects
|
||
that were affected by the libc_hidden_proto declaration for _exit. */
|
||
strong_alias (_exit, __GI__exit)
|
||
|
||
/* Try to get a machine dependent instruction which will make the
|
||
program crash. This is used in case everything else fails. */
|
||
#include <abort-instr.h>
|
||
#ifndef ABORT_INSTRUCTION
|
||
/* No such instruction is available. */
|
||
# define ABORT_INSTRUCTION
|
||
#endif
|
||
|
||
void weak_function
|
||
abort (void)
|
||
{
|
||
/* Try to abort using the system specific command. */
|
||
ABORT_INSTRUCTION;
|
||
|
||
/* If the abort instruction failed, exit. */
|
||
_exit (127);
|
||
|
||
/* If even this fails, make sure we never return. */
|
||
while (1)
|
||
/* Try for ever and ever. */
|
||
ABORT_INSTRUCTION;
|
||
}
|
||
|
||
/* We need this alias to satisfy references from libc_pic.a objects
|
||
that were affected by the libc_hidden_proto declaration for abort. */
|
||
strong_alias (abort, __GI_abort)
|
||
|
||
/* This function is called by interruptible RPC stubs. For initial
|
||
dynamic linking, just use the normal mach_msg. Since this defn is
|
||
weak, the real defn in libc.so will override it if we are linked into
|
||
the user program (-ldl). */
|
||
|
||
error_t weak_function
|
||
_hurd_intr_rpc_mach_msg (mach_msg_header_t *msg,
|
||
mach_msg_option_t option,
|
||
mach_msg_size_t send_size,
|
||
mach_msg_size_t rcv_size,
|
||
mach_port_t rcv_name,
|
||
mach_msg_timeout_t timeout,
|
||
mach_port_t notify)
|
||
{
|
||
return __mach_msg (msg, option, send_size, rcv_size, rcv_name,
|
||
timeout, notify);
|
||
}
|
||
|
||
|
||
void
|
||
internal_function
|
||
_dl_show_auxv (void)
|
||
{
|
||
/* There is nothing to print. Hurd has no auxiliary vector. */
|
||
}
|
||
|
||
|
||
void weak_function
|
||
_dl_init_first (int argc, ...)
|
||
{
|
||
/* This no-op definition only gets used if libc is not linked in. */
|
||
}
|
||
|
||
#endif /* SHARED */
|