mirror of
git://source.winehq.org/git/wine.git
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646 lines
19 KiB
C
646 lines
19 KiB
C
/*
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* Preloader for ld.so
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*
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* Copyright (C) 1995,96,97,98,99,2000,2001,2002 Free Software Foundation, Inc.
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* Copyright (C) 2004 Mike McCormack for Codeweavers
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* Copyright (C) 2004 Alexandre Julliard
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*
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* This 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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*
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* This 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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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* Design notes
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*
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* The goal of this program is to be a workaround for exec-shield, as used
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* by the Linux kernel distributed with Fedora Core and other distros.
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*
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* To do this, we implement our own shared object loader that reserves memory
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* that is important to Wine, and then loads the main binary and its ELF
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* interpreter.
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*
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* We will try to set up the stack and memory area so that the program that
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* loads after us (eg. the wine binary) never knows we were here, except that
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* areas of memory it needs are already magically reserved.
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*
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* The following memory areas are important to Wine:
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* 0x00000000 - 0x00110000 the DOS area
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* 0x80000000 - 0x81000000 the shared heap
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* ??? - ??? the PE binary load address (usually starting at 0x00400000)
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*
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* If this program is used as the shared object loader, the only difference
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* that the loaded programs should see is that this loader will be mapped
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* into memory when it starts.
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*/
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/*
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* References (things I consulted to understand how ELF loading works):
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*
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* glibc 2.3.2 elf/dl-load.c
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* http://www.gnu.org/directory/glibc.html
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*
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* Linux 2.6.4 fs/binfmt_elf.c
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* ftp://ftp.kernel.org/pub/linux/kernel/v2.6/linux-2.6.4.tar.bz2
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*
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* Userland exec, by <grugq@hcunix.net>
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* http://cert.uni-stuttgart.de/archive/bugtraq/2004/01/msg00002.html
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*
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* The ELF specification:
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* http://www.linuxbase.org/spec/booksets/LSB-Embedded/LSB-Embedded/book387.html
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#ifdef HAVE_SYS_MMAN_H
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# include <sys/mman.h>
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#endif
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#ifdef HAVE_ELF_H
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# include <elf.h>
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#endif
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#ifdef HAVE_LINK_H
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# include <link.h>
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#endif
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#ifdef HAVE_SYS_LINK_H
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# include <sys/link.h>
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#endif
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#include "main.h"
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/* ELF definitions */
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#define ELF_PREFERRED_ADDRESS(loader, maplength, mapstartpref) (mapstartpref)
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#define ELF_FIXED_ADDRESS(loader, mapstart) ((void) 0)
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#define MAP_BASE_ADDR(l) 0
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#ifndef MAP_COPY
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#define MAP_COPY MAP_PRIVATE
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#endif
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#ifndef MAP_NORESERVE
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#define MAP_NORESERVE 0
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#endif
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static struct wine_preload_info preload_info[] =
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{
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{ (void *)0x00000000, 0x00110000 }, /* DOS area */
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{ (void *)0x80000000, 0x01000000 }, /* shared heap */
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{ (void *)0x00110000, 0x0fef0000 }, /* PE exe range (FIXME) */
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{ 0, 0 } /* end of list */
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};
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/* debugging */
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#undef DUMP_SEGMENTS
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#undef DUMP_AUX_INFO
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#undef DUMP_SYMS
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/* older systems may not define these */
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#ifndef PT_TLS
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#define PT_TLS 7
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#endif
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static unsigned int page_size, page_mask;
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struct wld_link_map {
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ElfW(Addr) l_addr;
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ElfW(Dyn) *l_ld;
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const ElfW(Phdr) *l_phdr;
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ElfW(Addr) l_entry;
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ElfW(Half) l_ldnum;
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ElfW(Half) l_phnum;
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ElfW(Addr) l_map_start, l_map_end;
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ElfW(Addr) l_interp;
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};
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/*
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* The _start function is the entry and exit point of this program
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*
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* It calls wld_start, passing a pointer to the args it receives
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* then jumps to the address wld_start returns after removing the
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* first argv[] value, and decrementing argc
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*/
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void _start();
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extern char _end[];
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__ASM_GLOBAL_FUNC(_start,
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"\tcall wld_start\n"
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"\tpush %eax\n"
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"\txor %eax,%eax\n"
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"\txor %ecx,%ecx\n"
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"\txor %edx,%edx\n"
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"\tret\n")
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/*
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* wld_printf - just the basics
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*
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* %x prints a hex number
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* %s prints a string
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*/
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static void wld_vsprintf(char *str, char *fmt, va_list args )
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{
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char *p = fmt;
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while( *p )
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{
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if( *p == '%' )
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{
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p++;
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if( *p == 'x' )
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{
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int ch, i, x = va_arg( args, int );
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for(i=7; i>=0; i--)
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{
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ch = (x>>(i*4))&0xf;
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ch += '0';
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if(ch>'9')
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ch+=('A'-10-'0');
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*str++ = ch;
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}
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}
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else if( *p == 's' )
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{
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char *s = va_arg( args, char * );
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while(*s)
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*str++ = *s++;
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}
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else if( *p == 0 )
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break;
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p++;
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}
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*str++ = *p++;
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}
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*str = 0;
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}
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static void wld_printf(char *fmt, ... )
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{
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va_list args;
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char buffer[256];
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va_start( args, fmt );
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wld_vsprintf(buffer, fmt, args );
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va_end( args );
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write(2, buffer, strlen(buffer));
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}
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static void fatal_error(char *fmt, ... )
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{
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va_list args;
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char buffer[256];
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va_start( args, fmt );
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wld_vsprintf(buffer, fmt, args );
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va_end( args );
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write(2, buffer, strlen(buffer));
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_exit(1);
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}
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#ifdef DUMP_AUX_INFO
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/*
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* Dump interesting bits of the ELF auxv_t structure that is passed
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* as the 4th parameter to the _start function
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*/
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static void dump_auxiliary( ElfW(auxv_t) *av )
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{
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for ( ; av->a_type != AT_NULL; av++)
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switch (av->a_type)
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{
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case AT_PAGESZ:
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wld_printf("AT_PAGESZ = %x\n",av->a_un.a_val);
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break;
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case AT_PHDR:
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wld_printf("AT_PHDR = %x\n",av->a_un.a_ptr);
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break;
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case AT_PHNUM:
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wld_printf("AT_PHNUM = %x\n",av->a_un.a_val);
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break;
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case AT_ENTRY:
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wld_printf("AT_ENTRY = %x\n",av->a_un.a_val);
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break;
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case AT_BASE:
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wld_printf("AT_BASE = %x\n",av->a_un.a_val);
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break;
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}
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}
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#endif
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/*
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* set_auxiliary
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*
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* Set a field of the auxiliary structure
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*/
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static void set_auxiliary( ElfW(auxv_t) *av, int type, long int val )
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{
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for ( ; av->a_type != AT_NULL; av++)
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if( av->a_type == type )
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av->a_un.a_val = val;
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}
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/*
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* get_auxiliary
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*
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* Get a field of the auxiliary structure
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*/
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static int get_auxiliary( ElfW(auxv_t) *av, int type, int *val )
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{
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for ( ; av->a_type != AT_NULL; av++)
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if( av->a_type == type )
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{
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*val = av->a_un.a_val;
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return 1;
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}
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return 0;
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}
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/*
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* map_so_lib
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*
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* modelled after _dl_map_object_from_fd() from glibc-2.3.1/elf/dl-load.c
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*
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* This function maps the segments from an ELF object, and optionally
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* stores information about the mapping into the auxv_t structure.
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*/
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static void map_so_lib( const char *name, struct wld_link_map *l)
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{
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int fd;
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unsigned char buf[0x800];
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ElfW(Ehdr) *header = (ElfW(Ehdr)*)buf;
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ElfW(Phdr) *phdr, *ph;
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/* Scan the program header table, collecting its load commands. */
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struct loadcmd
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{
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ElfW(Addr) mapstart, mapend, dataend, allocend;
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off_t mapoff;
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int prot;
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} loadcmds[16], *c;
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size_t nloadcmds = 0, maplength;
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fd = open( name, O_RDONLY );
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if (fd == -1) fatal_error("%s: could not open\n", name );
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if (read( fd, buf, sizeof(buf) ) != sizeof(buf))
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fatal_error("%s: failed to read ELF header\n", name);
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phdr = (void*) (((unsigned char*)buf) + header->e_phoff);
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if( ( header->e_ident[0] != 0x7f ) ||
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( header->e_ident[1] != 'E' ) ||
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( header->e_ident[2] != 'L' ) ||
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( header->e_ident[3] != 'F' ) )
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fatal_error( "%s: not an ELF binary... don't know how to load it\n", name );
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if( header->e_machine != EM_386 )
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fatal_error("%s: not an i386 ELF binary... don't know how to load it\n", name );
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if (header->e_phnum > sizeof(loadcmds)/sizeof(loadcmds[0]))
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fatal_error( "%s: oops... not enough space for load commands\n", name );
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maplength = header->e_phnum * sizeof (ElfW(Phdr));
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if (header->e_phoff + maplength > sizeof(buf))
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fatal_error( "%s: oops... not enough space for ELF headers\n", name );
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l->l_ld = 0;
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l->l_addr = 0;
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l->l_phdr = 0;
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l->l_phnum = header->e_phnum;
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l->l_entry = header->e_entry;
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l->l_interp = 0;
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for (ph = phdr; ph < &phdr[l->l_phnum]; ++ph)
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{
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#ifdef DUMP_SEGMENTS
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wld_printf( "ph = %x\n", ph );
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wld_printf( " p_type = %x\n", ph->p_type );
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wld_printf( " p_flags = %x\n", ph->p_flags );
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wld_printf( " p_offset = %x\n", ph->p_offset );
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wld_printf( " p_vaddr = %x\n", ph->p_vaddr );
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wld_printf( " p_paddr = %x\n", ph->p_paddr );
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wld_printf( " p_filesz = %x\n", ph->p_filesz );
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wld_printf( " p_memsz = %x\n", ph->p_memsz );
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wld_printf( " p_align = %x\n", ph->p_align );
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#endif
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switch (ph->p_type)
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{
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/* These entries tell us where to find things once the file's
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segments are mapped in. We record the addresses it says
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verbatim, and later correct for the run-time load address. */
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case PT_DYNAMIC:
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l->l_ld = (void *) ph->p_vaddr;
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l->l_ldnum = ph->p_memsz / sizeof (Elf32_Dyn);
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break;
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case PT_PHDR:
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l->l_phdr = (void *) ph->p_vaddr;
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break;
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case PT_LOAD:
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{
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if ((ph->p_align & page_mask) != 0)
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fatal_error( "%s: ELF load command alignment not page-aligned\n", name );
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if (((ph->p_vaddr - ph->p_offset) & (ph->p_align - 1)) != 0)
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fatal_error( "%s: ELF load command address/offset not properly aligned\n", name );
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c = &loadcmds[nloadcmds++];
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c->mapstart = ph->p_vaddr & ~(ph->p_align - 1);
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c->mapend = ((ph->p_vaddr + ph->p_filesz + page_mask) & ~page_mask);
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c->dataend = ph->p_vaddr + ph->p_filesz;
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c->allocend = ph->p_vaddr + ph->p_memsz;
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c->mapoff = ph->p_offset & ~(ph->p_align - 1);
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c->prot = 0;
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if (ph->p_flags & PF_R)
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c->prot |= PROT_READ;
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if (ph->p_flags & PF_W)
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c->prot |= PROT_WRITE;
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if (ph->p_flags & PF_X)
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c->prot |= PROT_EXEC;
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}
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break;
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case PT_INTERP:
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l->l_interp = ph->p_vaddr;
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break;
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case PT_TLS:
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/*
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* We don't need to set anything up because we're
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* emulating the kernel, not ld-linux.so.2
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* The ELF loader will set up the TLS data itself.
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*/
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case PT_SHLIB:
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case PT_NOTE:
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default:
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break;
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}
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}
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/* Now process the load commands and map segments into memory. */
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c = loadcmds;
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/* Length of the sections to be loaded. */
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maplength = loadcmds[nloadcmds - 1].allocend - c->mapstart;
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if( header->e_type == ET_DYN )
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{
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ElfW(Addr) mappref;
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mappref = (ELF_PREFERRED_ADDRESS (loader, maplength, c->mapstart)
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- MAP_BASE_ADDR (l));
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/* Remember which part of the address space this object uses. */
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l->l_map_start = (ElfW(Addr)) mmap ((void *) mappref, maplength,
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c->prot, MAP_COPY | MAP_FILE,
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fd, c->mapoff);
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/* wld_printf("set : offset = %x\n", c->mapoff); */
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/* wld_printf("l->l_map_start = %x\n", l->l_map_start); */
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l->l_map_end = l->l_map_start + maplength;
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l->l_addr = l->l_map_start - c->mapstart;
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mprotect ((caddr_t) (l->l_addr + c->mapend),
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loadcmds[nloadcmds - 1].allocend - c->mapend,
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PROT_NONE);
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goto postmap;
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}
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else
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{
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char *preloader_start = (char *)_start - ((unsigned int)_start & page_mask);
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char *preloader_end = (char *)((unsigned int)(_end + page_mask) & ~page_mask);
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/* sanity check */
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if ((char *)c->mapstart + maplength > preloader_start &&
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(char *)c->mapstart <= preloader_end)
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fatal_error( "%s: binary overlaps preloader (%x-%x)\n",
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name, c->mapstart, (char *)c->mapstart + maplength );
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ELF_FIXED_ADDRESS (loader, c->mapstart);
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}
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/* Remember which part of the address space this object uses. */
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l->l_map_start = c->mapstart + l->l_addr;
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l->l_map_end = l->l_map_start + maplength;
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while (c < &loadcmds[nloadcmds])
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{
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if (c->mapend > c->mapstart)
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/* Map the segment contents from the file. */
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mmap ((void *) (l->l_addr + c->mapstart),
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c->mapend - c->mapstart, c->prot,
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MAP_FIXED | MAP_COPY | MAP_FILE, fd, c->mapoff);
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postmap:
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if (l->l_phdr == 0
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&& (ElfW(Off)) c->mapoff <= header->e_phoff
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&& ((size_t) (c->mapend - c->mapstart + c->mapoff)
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>= header->e_phoff + header->e_phnum * sizeof (ElfW(Phdr))))
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/* Found the program header in this segment. */
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l->l_phdr = (void *)(unsigned int) (c->mapstart + header->e_phoff - c->mapoff);
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if (c->allocend > c->dataend)
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{
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/* Extra zero pages should appear at the end of this segment,
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after the data mapped from the file. */
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ElfW(Addr) zero, zeroend, zeropage;
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zero = l->l_addr + c->dataend;
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zeroend = l->l_addr + c->allocend;
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zeropage = (zero + page_mask) & ~page_mask;
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/*
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* This is different from the dl-load load...
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* ld-linux.so.2 relies on the whole page being zero'ed
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*/
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zeroend = (zeroend + page_mask) & ~page_mask;
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if (zeroend < zeropage)
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{
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/* All the extra data is in the last page of the segment.
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We can just zero it. */
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zeropage = zeroend;
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}
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if (zeropage > zero)
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{
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/* Zero the final part of the last page of the segment. */
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if ((c->prot & PROT_WRITE) == 0)
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{
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/* Dag nab it. */
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mprotect ((caddr_t) (zero & ~page_mask), page_size, c->prot|PROT_WRITE);
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}
|
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memset ((void *) zero, '\0', zeropage - zero);
|
|
if ((c->prot & PROT_WRITE) == 0)
|
|
mprotect ((caddr_t) (zero & ~page_mask), page_size, c->prot);
|
|
}
|
|
|
|
if (zeroend > zeropage)
|
|
{
|
|
/* Map the remaining zero pages in from the zero fill FD. */
|
|
caddr_t mapat;
|
|
mapat = mmap ((caddr_t) zeropage, zeroend - zeropage,
|
|
c->prot, MAP_ANON|MAP_PRIVATE|MAP_FIXED,
|
|
-1, 0);
|
|
}
|
|
}
|
|
|
|
++c;
|
|
}
|
|
|
|
if (l->l_phdr == NULL) fatal_error("no program header\n");
|
|
|
|
l->l_phdr = (void *)((ElfW(Addr))l->l_phdr + l->l_addr);
|
|
l->l_entry += l->l_addr;
|
|
|
|
close( fd );
|
|
}
|
|
|
|
|
|
/*
|
|
* Find a symbol in the symbol table of the executable loaded
|
|
*/
|
|
static void *find_symbol( const ElfW(Phdr) *phdr, int num, char *var )
|
|
{
|
|
const ElfW(Dyn) *dyn = NULL;
|
|
const ElfW(Phdr) *ph;
|
|
const ElfW(Sym) *symtab = NULL;
|
|
const char *strings = NULL;
|
|
Elf_Symndx i, symtabend = 0;
|
|
|
|
/* check the values */
|
|
#ifdef DUMP_SYMS
|
|
wld_printf("%x %x\n", phdr, num );
|
|
#endif
|
|
if( ( phdr == NULL ) || ( num == 0 ) )
|
|
{
|
|
wld_printf("could not find PT_DYNAMIC header entry\n");
|
|
return NULL;
|
|
}
|
|
|
|
/* parse the (already loaded) ELF executable's header */
|
|
for (ph = phdr; ph < &phdr[num]; ++ph)
|
|
{
|
|
if( PT_DYNAMIC == ph->p_type )
|
|
{
|
|
dyn = (void *) ph->p_vaddr;
|
|
num = ph->p_memsz / sizeof (Elf32_Dyn);
|
|
break;
|
|
}
|
|
}
|
|
if( !dyn ) return NULL;
|
|
|
|
while( dyn->d_tag )
|
|
{
|
|
if( dyn->d_tag == DT_STRTAB )
|
|
strings = (const char*) dyn->d_un.d_ptr;
|
|
if( dyn->d_tag == DT_SYMTAB )
|
|
symtab = (const ElfW(Sym) *)dyn->d_un.d_ptr;
|
|
if( dyn->d_tag == DT_HASH )
|
|
symtabend = *((const Elf_Symndx *)dyn->d_un.d_ptr + 1);
|
|
#ifdef DUMP_SYMS
|
|
wld_printf("%x %x\n", dyn->d_tag, dyn->d_un.d_ptr );
|
|
#endif
|
|
dyn++;
|
|
}
|
|
|
|
if( (!symtab) || (!strings) ) return NULL;
|
|
|
|
for (i = 0; i < symtabend; i++)
|
|
{
|
|
if( ( ELF32_ST_BIND(symtab[i].st_info) == STT_OBJECT ) &&
|
|
( 0 == strcmp( strings+symtab[i].st_name, var ) ) )
|
|
{
|
|
#ifdef DUMP_SYMS
|
|
wld_printf("Found %s -> %x\n", strings+symtab[i].st_name, symtab[i].st_value );
|
|
#endif
|
|
return (void*)symtab[i].st_value;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* wld_start
|
|
*
|
|
* Repeat the actions the kernel would do when loading a dynamically linked .so
|
|
* Load the binary and then its ELF interpreter.
|
|
* Note, we assume that the binary is a dynamically linked ELF shared object.
|
|
*/
|
|
void* wld_start( int argc, ... )
|
|
{
|
|
int i;
|
|
char **argv, **p;
|
|
char *interp;
|
|
ElfW(auxv_t)* av;
|
|
struct wld_link_map main_binary_map, ld_so_map;
|
|
struct wine_preload_info **wine_main_preload_info;
|
|
|
|
argv = (char **)&argc + 1;
|
|
|
|
/* skip over the parameters */
|
|
p = argv + argc + 1;
|
|
|
|
/* skip over the environment */
|
|
while (*p) p++;
|
|
|
|
av = (ElfW(auxv_t)*) (p+1);
|
|
if (!get_auxiliary( av, AT_PAGESZ, &page_size )) page_size = 4096;
|
|
page_mask = page_size - 1;
|
|
|
|
#ifdef DUMP_AUX_INFO
|
|
for( i = 0; i<argc; i++ ) wld_printf("argv[%x] = %s\n", i, argv[i]);
|
|
dump_auxiliary( av );
|
|
#endif
|
|
|
|
/* reserve memory that Wine needs */
|
|
for (i = 0; preload_info[i].size; i++)
|
|
mmap( preload_info[i].addr, preload_info[i].size,
|
|
PROT_NONE, MAP_FIXED | MAP_PRIVATE | MAP_ANON | MAP_NORESERVE, -1, 0 );
|
|
|
|
/* load the main binary */
|
|
map_so_lib( argv[0], &main_binary_map );
|
|
|
|
/* load the ELF interpreter */
|
|
interp = (char *)main_binary_map.l_addr + main_binary_map.l_interp;
|
|
map_so_lib( interp, &ld_so_map );
|
|
|
|
/* store pointer to the preload info into the appropriate main binary variable */
|
|
wine_main_preload_info = find_symbol( main_binary_map.l_phdr, main_binary_map.l_phnum,
|
|
"wine_main_preload_info" );
|
|
if (wine_main_preload_info) *wine_main_preload_info = preload_info;
|
|
else wld_printf( "wine_main_preload_info not found\n" );
|
|
|
|
set_auxiliary( av, AT_PHDR, (unsigned long)main_binary_map.l_phdr );
|
|
set_auxiliary( av, AT_PHNUM, main_binary_map.l_phnum );
|
|
set_auxiliary( av, AT_BASE, ld_so_map.l_addr );
|
|
set_auxiliary( av, AT_ENTRY, main_binary_map.l_entry );
|
|
|
|
#ifdef DUMP_AUX_INFO
|
|
wld_printf("New auxiliary info:\n");
|
|
dump_auxiliary( av );
|
|
wld_printf("jumping to %x\n", ld_so_map.l_entry);
|
|
#endif
|
|
|
|
return (void *)ld_so_map.l_entry;
|
|
}
|