exec-shield patch take 6
Mike McCormack
mike at codeweavers.com
Wed Apr 28 05:02:47 CDT 2004
Description:
This patch allows platforms using exec-shield patch against the Linux
kernel (eg. Fedora Core) to run Wine without disabling exec-shield.
License: LGPL
Changes in version 6:
* include ulimit workaround
* resolve conflict with recent patch to WineHQ CVS tip
Changes in version 5:
* reserve the shared heap area as well as the PE load area
* allow multiple reserve areas in libwine
Changes in version 4:
* set the WINEPEEXEPATH environment variable correctly
Changes in version 3:
* reserve only the area required by the PE EXE if launched from
CreateProcess (else just a default slab)
* pass the reserved area to wine, so wine knows about it
* unmap the preloader after it is no longer used
Changes in verison 2:
* replace the shared object loader instead of using a bootstrap exe
Version 1:
* create a bootstrap exe that reserves memory before loading
wine-pthread or wine-kthread
-------------- next part --------------
Index: dlls/kernel/process.c
===================================================================
RCS file: /home/wine/wine/dlls/kernel/process.c,v
retrieving revision 1.55
diff -u -r1.55 process.c
--- dlls/kernel/process.c 28 Apr 2004 01:04:24 -0000 1.55
+++ dlls/kernel/process.c 28 Apr 2004 08:45:03 -0000
@@ -917,8 +917,6 @@
}
found:
- wine_free_pe_load_area(); /* the main binary is loaded, we don't need this anymore */
-
/* build command line */
set_library_wargv( __wine_main_argv );
if (!build_command_line( __wine_main_wargv )) goto error;
@@ -1060,7 +1058,8 @@
*
* Build the environment of a new child process.
*/
-static char **build_envp( const WCHAR *envW )
+static char **build_envp( const WCHAR *envW,
+ const char *workdir, const char *unixpath )
{
const WCHAR *p;
char **envp;
@@ -1073,7 +1072,7 @@
if (!(env = malloc( length ))) return NULL;
WideCharToMultiByte( CP_UNIXCP, 0, envW, p - envW, env, length, NULL, NULL );
- count += 4;
+ count += 6;
if ((envp = malloc( count * sizeof(*envp) )))
{
@@ -1086,12 +1085,19 @@
if ((p = getenv("TMP"))) *envptr++ = alloc_env_string( "TMP=", p );
if ((p = getenv("HOME"))) *envptr++ = alloc_env_string( "HOME=", p );
if ((p = getenv("WINEPREFIX"))) *envptr++ = alloc_env_string( "WINEPREFIX=", p );
+
+ /* record the unix working directory */
+ if (workdir) *envptr++ = alloc_env_string( "WINEWORKDIR=", workdir );
+ if (workdir) *envptr++ = alloc_env_string( "WINEPEEXEPATH=", unixpath );
+
/* now put the Windows environment strings */
for (p = env; *p; p += strlen(p) + 1)
{
if (is_special_env_var( p )) /* prefix it with "WINE" */
*envptr++ = alloc_env_string( "WINE", p );
else if (strncmp( p, "HOME=", 5 ) &&
+ strncmp( p, "WINEWORKDIR=", 12 ) &&
+ strncmp( p, "WINEPEEXEPATH=", 14 ) &&
strncmp( p, "WINEPREFIX=", 11 )) *envptr++ = p;
}
*envptr = 0;
@@ -1122,7 +1128,7 @@
if (!(pid = fork())) /* child */
{
char **argv = build_argv( cmdline, 0 );
- char **envp = build_envp( env );
+ char **envp = build_envp( env, NULL, NULL );
close( fd[0] );
/* Reset signals that we previously set to SIG_IGN */
@@ -1215,6 +1221,7 @@
pid_t pid;
int err;
char dummy = 0;
+ WCHAR buffer[MAX_PATH];
if (!env) env = GetEnvironmentStringsW();
@@ -1244,7 +1251,20 @@
if (!(pid = fork())) /* child */
{
char **argv = build_argv( cmd_line, 1 );
- char **envp = build_envp( env );
+ char **envp = build_envp( env, NULL, NULL );
+ char *unixpath;
+
+ unixpath = wine_get_unix_file_name( buffer );
+
+ /* preseve the current directory, the preloader may forget it */
+ if( !unixdir )
+ {
+ char *dir = HeapAlloc( GetProcessHeap(), 0, MAX_PATH );
+ getcwd( dir, MAX_PATH );
+ unixdir = dir;
+ }
+ envp = build_envp( env, unixdir, unixpath );
+ HeapFree( GetProcessHeap(), 0, unixpath );
close( startfd[1] );
close( execfd[0] );
@@ -1256,8 +1276,6 @@
/* Reset signals that we previously set to SIG_IGN */
signal( SIGPIPE, SIG_DFL );
signal( SIGCHLD, SIG_DFL );
-
- if (unixdir) chdir(unixdir);
if (argv && envp)
{
Index: libs/wine/config.c
===================================================================
RCS file: /home/wine/wine/libs/wine/config.c,v
retrieving revision 1.3
diff -u -r1.3 config.c
--- libs/wine/config.c 11 Nov 2003 22:21:29 -0000 1.3
+++ libs/wine/config.c 28 Apr 2004 08:45:03 -0000
@@ -243,6 +243,23 @@
return user_name;
}
+/* run wine binary in it's own directory, so it can find it's preloader */
+int wine_cwd_execve( const char *name, char **argv, char **envp )
+{
+ char *dir, *p;
+
+ dir = strdup( name );
+ p = strrchr( dir, '/' );
+ if( p )
+ {
+ *p++ = 0;
+ chdir( dir );
+ name = p;
+ }
+
+ return execve( name, argv, envp );
+}
+
/* exec a wine internal binary (either the wine loader or the wine server) */
/* if name is null, default to the name of the current binary */
void wine_exec_wine_binary( const char *name, char **argv, char **envp )
@@ -257,7 +274,7 @@
argv[0] = xmalloc( sizeof(BINDIR "/") + strlen(name) );
strcpy( argv[0], BINDIR "/" );
strcat( argv[0], name );
- execve( argv[0], argv, envp );
+ wine_cwd_execve( argv[0], argv, envp );
free( argv[0] );
/* now try the path of argv0 of the current binary */
@@ -266,7 +283,7 @@
argv[0] = xmalloc( strlen(argv0_path) + strlen(name) + 1 );
strcpy( argv[0], argv0_path );
strcat( argv[0], name );
- execve( argv[0], argv, envp );
+ wine_cwd_execve( argv[0], argv, envp );
free( argv[0] );
}
@@ -283,7 +300,7 @@
memcpy( argv[0], pos, ptr - pos );
strcpy( argv[0] + (ptr - pos), "/" );
strcat( argv[0] + (ptr - pos), name );
- execve( argv[0], argv, envp );
+ wine_cwd_execve( argv[0], argv, envp );
pos = ptr;
}
free( argv[0] );
Index: libs/wine/port.c
===================================================================
RCS file: /home/wine/wine/libs/wine/port.c,v
retrieving revision 1.8
diff -u -r1.8 port.c
--- libs/wine/port.c 5 Feb 2004 02:01:35 -0000 1.8
+++ libs/wine/port.c 28 Apr 2004 08:45:03 -0000
@@ -150,36 +150,63 @@
#error You must implement wine_switch_to_stack for your platform
#endif
+struct reserve_area
+{
+ char *base;
+ size_t size;
+ struct reserve_area *next;
+};
-static char *pe_area;
-static size_t pe_area_size;
+struct reserve_area *reserve_list;
/***********************************************************************
- * wine_set_pe_load_area
+ * wine_reserve_area
*
- * Define the reserved area to use for loading the main PE binary.
+ * Define a reserved area (for the PE binary and system heap)
+ * These function are not thread safe, so we assume that
+ * they're called before any threads are started, and all the
+ * reserve areas are free'd.
*/
-void wine_set_pe_load_area( void *base, size_t size )
+void wine_reserve_area( void *base, size_t size )
{
+ struct reserve_area *area;
unsigned int page_mask = getpagesize() - 1;
char *end = (char *)base + size;
- pe_area = (char *)(((unsigned long)base + page_mask) & ~page_mask);
- pe_area_size = (end - pe_area) & ~page_mask;
+ area = malloc( sizeof (struct reserve_area) );
+
+ area->base = (char *)(((unsigned long)base + page_mask) & ~page_mask);
+ area->size = (end - area->base) & ~page_mask;
+
+ area->next = reserve_list;
+ reserve_list = area;
}
/***********************************************************************
- * wine_free_pe_load_area
+ * wine_free_area
*
- * Free the reserved area to use for loading the main PE binary.
+ * Free a reserved area.
*/
-void wine_free_pe_load_area(void)
+int wine_free_area( char *start, size_t size )
{
+ struct reserve_area *area, **p;
+
+ for( p = &reserve_list; (area = *p); p = &area->next )
+ if( start >= area->base && start + size <= area->base + area->size)
+ break;
+
+ if( !area )
+ return 0;
+
+ *p = area->next;
+
#ifdef HAVE_MMAP
- if (pe_area) munmap( pe_area, pe_area_size );
+ munmap( area->base, area->size );
#endif
- pe_area = NULL;
+
+ free( area );
+ return 1;
}
@@ -296,13 +323,8 @@
flags |= MAP_PRIVATE;
#endif
- if (pe_area && start &&
- (char *)start >= pe_area &&
- (char *)start + size <= pe_area + pe_area_size)
- {
- wine_free_pe_load_area();
+ if ( start && reserve_list && wine_free_area(start, size) )
flags |= MAP_FIXED;
- }
if (!(flags & MAP_FIXED))
{
Index: libs/wine/wine.def
===================================================================
RCS file: /home/wine/wine/libs/wine/wine.def,v
retrieving revision 1.10
diff -u -r1.10 wine.def
--- libs/wine/wine.def 5 Feb 2004 02:01:35 -0000 1.10
+++ libs/wine/wine.def 28 Apr 2004 08:45:03 -0000
@@ -64,5 +64,5 @@
wine_pthread_init_thread
wine_set_fs
wine_set_gs
- wine_set_pe_load_area
+ wine_reserve_area
wine_switch_to_stack
Index: libs/wine/wine.map
===================================================================
RCS file: /home/wine/wine/libs/wine/wine.map,v
retrieving revision 1.1
diff -u -r1.1 wine.map
--- libs/wine/wine.map 12 Feb 2004 22:54:00 -0000 1.1
+++ libs/wine/wine.map 28 Apr 2004 08:45:03 -0000
@@ -64,7 +64,7 @@
wine_pthread_init_thread;
wine_set_fs;
wine_set_gs;
- wine_set_pe_load_area;
+ wine_reserve_area;
wine_switch_to_stack;
local: *;
Index: loader/Makefile.in
===================================================================
RCS file: /home/wine/wine/loader/Makefile.in,v
retrieving revision 1.14
diff -u -r1.14 Makefile.in
--- loader/Makefile.in 22 Nov 2003 00:08:26 -0000 1.14
+++ loader/Makefile.in 28 Apr 2004 08:45:03 -0000
@@ -23,20 +23,30 @@
LIBPTHREAD = @LIBPTHREAD@
LDEXECFLAGS = @LDEXECFLAGS@
-wine-glibc: glibc.o Makefile.in
+WINELDEXECFLAGS = $(LDEXECFLAGS),--dynamic-linker=$(WINELDSO)
+
+WINELDSO=ld-winepreload.so
+
+$(WINELDSO): preload.o Makefile.in
+ $(CC) -nostartfiles -lc -static -Wl,"-Ttext=0x7ff81000" -o $@ $<
+
+preload.c: preload.h main.h
+
+wine-glibc: glibc.o Makefile.in $(WINELDSO)
$(CC) -o $@ $(LDEXECFLAGS) glibc.o $(LIBWINE) $(LIBPORT) $(LIBPTHREAD) $(EXTRALIBS) $(LDFLAGS)
-wine-kthread: $(KTHREAD_OBJS) Makefile.in
- $(CC) -o $@ $(LDEXECFLAGS) $(KTHREAD_OBJS) $(LIBWINE) $(LIBPORT) $(EXTRALIBS) $(LDFLAGS)
+wine-kthread: $(KTHREAD_OBJS) Makefile.in $(WINELDSO)
+ $(CC) -o $@ $(WINELDEXECFLAGS) $(KTHREAD_OBJS) $(LIBWINE) $(LIBPORT) $(EXTRALIBS) $(LDFLAGS)
-wine-pthread: $(PTHREAD_OBJS) Makefile.in
- $(CC) -o $@ $(LDEXECFLAGS) $(PTHREAD_OBJS) $(LIBWINE) $(LIBPORT) $(LIBPTHREAD) $(EXTRALIBS) $(LDFLAGS)
+wine-pthread: $(PTHREAD_OBJS) Makefile.in $(WINELDSO)
+ $(CC) -o $@ $(WINELDEXECFLAGS) $(PTHREAD_OBJS) $(LIBWINE) $(LIBPORT) $(LIBPTHREAD) $(EXTRALIBS) $(LDFLAGS)
$(MODULE): $(MAIN_BINARY)
$(RM) $(MODULE) && $(LN_S) $(MAIN_BINARY) $(MODULE)
install:: $(WINE_BINARIES)
$(MKINSTALLDIRS) $(bindir)
+ $(INSTALL_PROGRAM) $(WINELDSO) $(bindir); \
for f in $(WINE_BINARIES); do \
if [ "$(MAIN_BINARY)" = "$$f" ]; \
then $(INSTALL_PROGRAM) $$f $(bindir)/$(MODULE); \
@@ -48,6 +58,6 @@
$(RM) $(WINE_BINARIES:%=$(bindir)/%) $(bindir)/$(MODULE)
clean::
- $(RM) $(WINE_BINARIES) $(MODULE)
+ $(RM) $(WINE_BINARIES) $(MODULE) $(WINELDSO)
### Dependencies:
Index: loader/glibc.c
===================================================================
RCS file: /home/wine/wine/loader/glibc.c,v
retrieving revision 1.3
diff -u -r1.3 glibc.c
--- loader/glibc.c 20 Feb 2004 20:19:23 -0000 1.3
+++ loader/glibc.c 28 Apr 2004 08:45:03 -0000
@@ -29,6 +29,7 @@
#ifdef HAVE_PTHREAD_H
# include <pthread.h>
#endif
+#include <sys/resource.h>
#include "wine/library.h"
@@ -75,6 +76,23 @@
{
const char *loader = getenv( "WINELOADER" );
const char *threads = get_threading();
+ char cwd[MAX_PATH], *cwd_var;
+
+ /* hack to work-around broken address space layout in RHEL3 */
+ struct rlimit limit;
+ getrlimit( RLIMIT_STACK, &limit );
+ limit.rlim_cur = limit.rlim_max;
+ setrlimit( RLIMIT_STACK, &limit );
+
+ if( !getcwd( cwd, sizeof cwd ) )
+ {
+ fprintf( stderr, "wine: could get current directory\n" );
+ exit(1);
+ }
+ cwd_var = xmalloc( sizeof("WINEWORKDIR=") + strlen(cwd) );
+ strcpy( cwd_var, "WINEWORKDIR=" );
+ strcat( cwd_var, cwd );
+ putenv( cwd_var );
if (loader)
{
@@ -86,6 +104,9 @@
new_name = xmalloc( (path - loader) + strlen(threads) + 1 );
memcpy( new_name, loader, path - loader );
+ new_name[ path - loader ] = 0;
+ if( new_name[0] )
+ chdir( new_name );
strcpy( new_name + (path - loader), threads );
/* update WINELOADER with the new name */
Index: loader/main.c
===================================================================
RCS file: /home/wine/wine/loader/main.c,v
retrieving revision 1.90
diff -u -r1.90 main.c
--- loader/main.c 20 Jan 2004 00:28:01 -0000 1.90
+++ loader/main.c 28 Apr 2004 08:45:03 -0000
@@ -20,19 +20,54 @@
#include <stdio.h>
#include <stdlib.h>
+#include <unistd.h>
+#include <sys/mman.h>
#include "wine/library.h"
+#include "main.h"
+
+extern void wine_reserve_area( void *base, size_t size );
+
+/* this variable is set by the wine-specific shared object loader */
+struct wine_preload_info *wine_preload_vars;
+
/**********************************************************************
* main
*/
int main( int argc, char *argv[] )
{
- char error[1024];
+ char error[1024], *dir;
+ if( wine_preload_vars )
+ {
#if 0
- static char pe_load[256*1024*1024] __attribute__((aligned(4096)));
- wine_set_pe_load_area( pe_load, sizeof(pe_load) );
+ printf("vars(*%p) = %p -> (%p, %08x) (%p, %08x) (%p, %08x)\n",
+ &wine_preload_vars, wine_preload_vars,
+ wine_preload_vars->pe_address,
+ wine_preload_vars->pe_size,
+ wine_preload_vars->heap_address,
+ wine_preload_vars->heap_size,
+ wine_preload_vars->preload_base,
+ wine_preload_vars->preload_size );
#endif
+
+ /* let wine know which area was mapped for the PE EXE */
+ wine_reserve_area( wine_preload_vars->pe_address,
+ wine_preload_vars->pe_size);
+
+ /* let wine know which area was mapped for the system heap */
+ wine_reserve_area( wine_preload_vars->heap_address,
+ wine_preload_vars->heap_size);
+
+ /* unmap the preloader itself */
+ munmap( wine_preload_vars->preload_base,
+ wine_preload_vars->preload_size );
+ wine_preload_vars = NULL;
+ }
+
+ dir = getenv( "WINEWORKDIR" );
+ if( dir )
+ chdir( dir );
wine_init( argc, argv, error, sizeof(error) );
fprintf( stderr, "wine: failed to initialize: %s\n", error );
--- /dev/null 1994-07-18 08:46:18.000000000 +0900
+++ loader/main.h 2004-04-15 17:29:17.000000000 +0900
@@ -0,0 +1,10 @@
+
+struct wine_preload_info
+{
+ void *pe_address;
+ size_t pe_size;
+ void *heap_address;
+ size_t heap_size;
+ void *preload_base;
+ size_t preload_size;
+};
--- /dev/null 1994-07-18 08:46:18.000000000 +0900
+++ loader/preload.h 2004-04-15 17:29:17.000000000 +0900
@@ -0,0 +1,51 @@
+/*
+ mini loader for ld.so - x86 Linux 2.4.x+ kernels only
+
+ Copyright 2004 Mike McCormack for Codeweavers
+
+ Copyright (C) 1995,96,97,98,99,2000,2001,2002 Free Software Foundation, Inc.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA.
+ */
+
+#define LDSO_NAME "/lib/ld-linux.so.2"
+
+/* ELF definitions */
+#define ELF_PREFERRED_ADDRESS(loader, maplength, mapstartpref) (mapstartpref)
+#define ELF_FIXED_ADDRESS(loader, mapstart) ((void) 0)
+
+#define __ELF_NATIVE_CLASS 32
+#define MAP_BASE_ADDR(l) 0
+#define MAP_COPY MAP_PRIVATE
+#define ANONFD -1
+
+#define ElfW(type) _ElfW (Elf, __ELF_NATIVE_CLASS, type)
+#define _ElfW(e,w,t) _ElfW_1 (e, w, _##t)
+#define _ElfW_1(e,w,t) e##w##t
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#define GL(x) x
+
+extern unsigned int GL(dl_pagesize);
+
--- /dev/null 1994-07-18 08:46:18.000000000 +0900
+++ loader/preload.c 2004-04-15 18:57:34.000000000 +0900
@@ -0,0 +1,750 @@
+/*
+ mini loader for ld.so - x86 Linux 2.4.x+ kernels only
+
+ Copyright 2004 Mike McCormack for Codeweavers
+
+ Copyright (C) 1995,96,97,98,99,2000,2001,2002 Free Software Foundation, Inc.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA.
+ */
+
+/*
+ * Design notes
+ *
+ * The goal of this program is to be a workaround for exec-shield, as used
+ * by the Linux kernel distributed with Fedora Core and other distros.
+ *
+ * To do this, we implement our own shared object loader that reserves memory
+ * that is important to Wine, and then loads the the standard shared object
+ * loader (ELF interpreter), usually ld-linux.so.2
+ *
+ * This program will be invoked by linking it as the shared object loader
+ * using the link time flags --shared-loader=ld-winepreload.so . Since we
+ * are not using an absolute path, an executable using this shared object
+ * loader must be invoked from the directory that contains this loader.
+ *
+ * We will try to set up the stack an memory area so that the program that
+ * loads after us (eg. the wine binary) never knows we were here, except that
+ * areas of memory it needs are already magically reserved.
+ *
+ * The following memory areas are important to Wine:
+ * 0x00000000 - the DOS area
+ * 0x00400000 - the standard Win32 load address
+ * 0x65430000 - the shared heap
+ *
+ * If this program is used as the shared object loader. the only difference
+ * that the loaded programs should see is that this loader will be mapped
+ * into memory when it starts.
+ *
+ * Limitations:
+ * * using a non-absolution path for the shared object loader is not standard
+ */
+
+/*
+ * References (things I consulted to understand how ELF loading works):
+ *
+ * glibc 2.3.2 elf/dl-load.c
+ * http://www.gnu.org/directory/glibc.html
+ *
+ * Linux 2.6.4 fs/binfmt_elf.c
+ * ftp://ftp.kernel.org/pub/linux/kernel/v2.6/linux-2.6.4.tar.bz2
+ *
+ * Userland exec, by <grugq at hcunix.net>
+ * http://cert.uni-stuttgart.de/archive/bugtraq/2004/01/msg00002.html
+ *
+ * The ELF specification:
+ * http://www.linuxbase.org/spec/booksets/LSB-Embedded/LSB-Embedded/book387.html
+ */
+
+#include "preload.h"
+#include "main.h"
+#include <elf.h>
+
+/* the following headers are needed to get the definition for IMAGE_NT_HEADERS */
+#include <stdarg.h>
+#include "windef.h"
+#include "winbase.h"
+
+/* debugging */
+#undef DUMP_SEGMENTS
+#undef DUMP_ARG
+#undef DUMP_AUX_INFO
+#undef DUMP_SYMS
+#undef DUMP_PERESERVE
+
+/* older systems may not define these */
+#ifndef PT_TLS
+#define PT_TLS 7
+#endif
+#ifndef PT_GNU_EH_FRAME
+#define PT_GNU_EH_FRAME 0x6474e550
+#endif
+#ifndef PT_GNU_STACK
+#define PT_GNU_STACK 0x6474e551
+#endif
+#ifndef PT_GNU_RELRO
+#define PT_GNU_RELRO 0x6474e552
+#endif
+
+unsigned int GL(dl_pagesize) = 0x0000;
+extern const unsigned char _end[];
+
+struct link_map {
+ ElfW(Addr) l_addr;
+ ElfW(Dyn) *l_ld;
+ const ElfW(Phdr) *l_phdr;
+ ElfW(Addr) l_entry;
+ ElfW(Half) l_ldnum;
+ ElfW(Half) l_phnum;
+ ElfW(Addr) l_map_start, l_map_end;
+};
+
+/*
+ * wld_printf - just the basics
+ *
+ * %x prints a hex number
+ * %s prints a string
+ */
+void wld_sprintf(char *str, char *fmt, int *args )
+{
+ char *p = fmt;
+
+ while( *p )
+ {
+ if( *p == '%' )
+ {
+ p++;
+ if( *p == 'x' )
+ {
+ int ch, i, x = *++args;
+ for(i=7; i>=0; i--)
+ {
+ ch = (x>>(i*4))&0xf;
+ ch += '0';
+ if(ch>'9')
+ ch+=('A'-10-'0');
+ *str++ = ch;
+ }
+ }
+ else if( *p == 's' )
+ {
+ char *s = (char*)*++args;
+ while(*s)
+ *str++ = *s++;
+ }
+ else if( *p == 0 )
+ break;
+ p++;
+ }
+ *str++ = *p++;
+ }
+ *str = 0;
+}
+
+int wld_strlen(char *str)
+{
+ int n = 0;
+ while( str[n] )
+ n++;
+ return n;
+}
+
+void wld_printf(char *fmt, ... )
+{
+ char buffer[100];
+ int n;
+
+ buffer[0]=0;
+ wld_sprintf(buffer, fmt, (int*)&fmt );
+ n = wld_strlen( buffer );
+ write(2, buffer, n);
+}
+
+void wld_strncpy(char *dest, char *src, int count )
+{
+ while( (*dest++ = *src++) && --count )
+ ;
+ *dest = 0;
+}
+
+void wld_memset( unsigned char *buf, int val, size_t len )
+{
+ while( len-- )
+ *buf++=val;
+}
+
+#ifdef DUMP_AUX_INFO
+/*
+ * Dump interesting bits of the ELF auxv_t structure that is passed
+ * as the 4th parameter to the _start function
+ */
+static void wld_dump_auxilary( ElfW(auxv_t) *av )
+{
+ for ( ; av->a_type != AT_NULL; av++)
+ switch (av->a_type)
+ {
+ case AT_PAGESZ:
+ wld_printf("AT_PAGESZ = %x\n",av->a_un.a_val);
+ break;
+ case AT_PHDR:
+ wld_printf("AT_PHDR = %x\n",av->a_un.a_ptr);
+ break;
+ case AT_PHNUM:
+ wld_printf("AT_PHNUM = %x\n",av->a_un.a_val);
+ break;
+ case AT_ENTRY:
+ wld_printf("AT_ENTRY = %x\n",av->a_un.a_val);
+ break;
+ case AT_BASE:
+ wld_printf("AT_BASE = %x\n",av->a_un.a_val);
+ break;
+ }
+}
+#endif
+
+/*
+ * wld_set_auxilary
+ *
+ * Set a field of the auxillary structure
+ */
+void wld_set_auxilary( ElfW(auxv_t) *av, int type, long int val )
+{
+ for ( ; av->a_type != AT_NULL; av++)
+ if( av->a_type == type )
+ av->a_un.a_val = val;
+}
+
+/*
+ * wld_get_auxilary
+ *
+ * Get a field of the auxillary structure
+ */
+int wld_get_auxilary( ElfW(auxv_t) *av, int type, int *val )
+{
+ for ( ; av->a_type != AT_NULL; av++)
+ if( av->a_type == type )
+ {
+ *val = av->a_un.a_val;
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * wld_map_so
+ *
+ * modelled after _dl_map_object_from_fd() from glibc-2.3.1/elf/dl-load.c
+ *
+ * This function maps the segments from an ELF object, and optionally
+ * stores information about the mapping into the auxv_t structure.
+ */
+void* wld_map_so( int fd, void* buf, size_t buflen, struct link_map *l)
+{
+ ElfW(Ehdr) *header = buf;
+ ElfW(Phdr) *phdr, *ph;
+ /* Scan the program header table, collecting its load commands. */
+ struct loadcmd
+ {
+ ElfW(Addr) mapstart, mapend, dataend, allocend;
+ off_t mapoff;
+ int prot;
+ } loadcmds[header->e_phnum], *c;
+ size_t nloadcmds = 0, maplength;
+
+ header = buf;
+ phdr = (void*) (((unsigned char*)buf) + header->e_phoff);
+
+ if( header->e_ident[0] != 0x7f &&
+ header->e_ident[0] != 'E' &&
+ header->e_ident[0] != 'L' &&
+ header->e_ident[0] != 'F' )
+ {
+ wld_printf("Not an ELF binary... don't know how to load it\n");
+ return NULL;
+ }
+
+ if( header->e_machine != EM_386 )
+ {
+ wld_printf("Not an i386 ELF binary... don't know how to load it\n");
+ return NULL;
+ }
+
+ maplength = header->e_phnum * sizeof (ElfW(Phdr));
+ if (header->e_phoff + maplength > (size_t) buflen)
+ {
+ wld_printf("oops... not enough space for ELF headers\n");
+ exit(1);
+ }
+
+ l->l_ld = 0;
+ l->l_addr = 0;
+ l->l_phnum = header->e_phnum;
+ l->l_entry = header->e_entry;
+
+ for (ph = phdr; ph < &phdr[l->l_phnum]; ++ph)
+ {
+
+#ifdef DUMP_SEGMENTS
+ wld_printf( "ph = %x\n", ph );
+ wld_printf( " p_type = %x\n", ph->p_type );
+ wld_printf( " p_flags = %x\n", ph->p_flags );
+ wld_printf( " p_offset = %x\n", ph->p_offset );
+ wld_printf( " p_vaddr = %x\n", ph->p_vaddr );
+ wld_printf( " p_paddr = %x\n", ph->p_paddr );
+ wld_printf( " p_filesz = %x\n", ph->p_filesz );
+ wld_printf( " p_memsz = %x\n", ph->p_memsz );
+ wld_printf( " p_align = %x\n", ph->p_align );
+#endif
+
+ switch (ph->p_type)
+ {
+ /* These entries tell us where to find things once the file's
+ segments are mapped in. We record the addresses it says
+ verbatim, and later correct for the run-time load address. */
+ case PT_DYNAMIC:
+ l->l_ld = (void *) ph->p_vaddr;
+ l->l_ldnum = ph->p_memsz / sizeof (Elf32_Dyn);
+ break;
+
+ case PT_PHDR:
+ l->l_phdr = (void *) ph->p_vaddr;
+ break;
+
+ case PT_TLS:
+ /*
+ * We don't need to set anything up because we're
+ * emulating the kernel, not ld-linux.so.2
+ * The ELF loader will set up the TLS data itself.
+ */
+ break;
+
+ case PT_LOAD:
+ {
+ if ((ph->p_align & (GL(dl_pagesize) - 1)) != 0)
+ {
+ wld_printf("ELF load command alignment not page-aligned");
+ return NULL;
+ }
+ if (((ph->p_vaddr - ph->p_offset) & (ph->p_align - 1)) != 0)
+ {
+ wld_printf("ELF load command address/offset not properly aligned");
+ return NULL;
+ }
+
+ c = &loadcmds[nloadcmds++];
+ c->mapstart = ph->p_vaddr & ~(ph->p_align - 1);
+ c->mapend = ((ph->p_vaddr + ph->p_filesz + GL(dl_pagesize) - 1)
+ & ~(GL(dl_pagesize) - 1));
+ c->dataend = ph->p_vaddr + ph->p_filesz;
+ c->allocend = ph->p_vaddr + ph->p_memsz;
+ c->mapoff = ph->p_offset & ~(ph->p_align - 1);
+
+ c->prot = 0;
+ if (ph->p_flags & PF_R)
+ c->prot |= PROT_READ;
+ if (ph->p_flags & PF_W)
+ c->prot |= PROT_WRITE;
+ if (ph->p_flags & PF_X)
+ c->prot |= PROT_EXEC;
+ }
+ break;
+
+ case PT_INTERP:
+ break;
+
+ case PT_SHLIB:
+ case PT_NOTE:
+ case PT_GNU_EH_FRAME:
+ case PT_GNU_STACK:
+ case PT_GNU_RELRO:
+ break;
+
+ default:
+ /* wld_printf("warning: unknown header type %x\n", ph->p_type); */
+ break;
+ }
+ }
+
+ /* Now process the load commands and map segments into memory. */
+ c = loadcmds;
+
+ /* Length of the sections to be loaded. */
+ maplength = loadcmds[nloadcmds - 1].allocend - c->mapstart;
+
+ if( header->e_type == ET_DYN )
+ {
+ ElfW(Addr) mappref;
+ mappref = (ELF_PREFERRED_ADDRESS (loader, maplength, c->mapstart)
+ - MAP_BASE_ADDR (l));
+
+ /* Remember which part of the address space this object uses. */
+ l->l_map_start = (ElfW(Addr)) mmap ((void *) mappref, maplength,
+ c->prot, MAP_COPY | MAP_FILE,
+ fd, c->mapoff);
+ /* wld_printf("set : offset = %x\n", c->mapoff); */
+ /* wld_printf("l->l_map_start = %x\n", l->l_map_start); */
+
+ l->l_map_end = l->l_map_start + maplength;
+ l->l_addr = l->l_map_start - c->mapstart;
+
+ mprotect ((caddr_t) (l->l_addr + c->mapend),
+ loadcmds[nloadcmds - 1].allocend - c->mapend,
+ PROT_NONE);
+ goto postmap;
+ }
+ else
+ {
+ ELF_FIXED_ADDRESS (loader, c->mapstart);
+ }
+
+ /* Remember which part of the address space this object uses. */
+ l->l_map_start = c->mapstart + l->l_addr;
+ l->l_map_end = l->l_map_start + maplength;
+
+ while (c < &loadcmds[nloadcmds])
+ {
+ if (c->mapend > c->mapstart)
+ /* Map the segment contents from the file. */
+ mmap ((void *) (l->l_addr + c->mapstart),
+ c->mapend - c->mapstart, c->prot,
+ MAP_FIXED | MAP_COPY | MAP_FILE, fd, c->mapoff);
+
+ postmap:
+ if (l->l_phdr == 0
+ && (ElfW(Off)) c->mapoff <= header->e_phoff
+ && ((size_t) (c->mapend - c->mapstart + c->mapoff)
+ >= header->e_phoff + header->e_phnum * sizeof (ElfW(Phdr))))
+ /* Found the program header in this segment. */
+ l->l_phdr = (void *) (c->mapstart + header->e_phoff - c->mapoff);
+
+ if (c->allocend > c->dataend)
+ {
+ /* Extra zero pages should appear at the end of this segment,
+ after the data mapped from the file. */
+ ElfW(Addr) zero, zeroend, zeropage;
+
+ zero = l->l_addr + c->dataend;
+ zeroend = l->l_addr + c->allocend;
+ zeropage = ((zero + GL(dl_pagesize) - 1)
+ & ~(GL(dl_pagesize) - 1));
+
+ /*
+ * This is different to the dl-load load...
+ * ld-linux.so.2 relies on the whole page being zero'ed
+ */
+ zeroend = (zeroend +GL(dl_pagesize) - 1) & ~(GL(dl_pagesize) - 1);
+
+ if (zeroend < zeropage)
+ {
+ /* All the extra data is in the last page of the segment.
+ We can just zero it. */
+ zeropage = zeroend;
+ }
+
+ if (zeropage > zero)
+ {
+ /* Zero the final part of the last page of the segment. */
+ if ((c->prot & PROT_WRITE) == 0)
+ {
+ /* Dag nab it. */
+ mprotect ((caddr_t) (zero & ~(GL(dl_pagesize) - 1)),
+ GL(dl_pagesize),
+ c->prot|PROT_WRITE);
+ }
+ memset ((void *) zero, '\0', zeropage - zero);
+ if ((c->prot & PROT_WRITE) == 0)
+ mprotect ((caddr_t) (zero & ~(GL(dl_pagesize) - 1)),
+ GL(dl_pagesize), 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,
+ ANONFD, 0);
+ }
+ }
+
+ ++c;
+ }
+
+ if (l->l_phdr == NULL)
+ {
+ wld_printf("no program header\n");
+ exit(1);
+ }
+
+ (ElfW(Addr)) l->l_phdr += l->l_addr;
+ (ElfW(Addr)) l->l_entry += l->l_addr;
+
+ return (void*)l->l_entry;
+}
+
+#define ROUND_SIZE(addr,size) \
+ (((int)(size) + ((int)(addr) & page_mask) + page_mask) & ~page_mask)
+
+/*
+ * wld_reserve_wine_memory
+ *
+ * This is the reason we are here.
+ * We want to reserve address space so that the kernel doesn't
+ * map stuff there. We do this by getting in first before
+ * anything else is mapped (except this program) and reserve
+ * the memory we want.
+ */
+void wld_reserve_wine_memory( char *pe_file, void **base, size_t *size )
+{
+ IMAGE_DOS_HEADER dos;
+ IMAGE_NT_HEADERS nt;
+ int unix_fd, page_mask = GL(dl_pagesize) - 1;
+
+ if( !pe_file )
+ return;
+
+ unix_fd = open( pe_file, O_RDONLY, 0);
+ if( unix_fd < 0 )
+ return;
+
+ /*
+ * The following code is borrowed from
+ * get_image_params() in wine/server/mapping.c
+ */
+ if (read( unix_fd, &dos, sizeof(dos) ) != sizeof(dos)) goto error;
+ if (dos.e_magic != IMAGE_DOS_SIGNATURE) goto error;
+ if (lseek( unix_fd, dos.e_lfanew, SEEK_SET ) == -1) goto error;
+
+ if (read( unix_fd, &nt.Signature, sizeof(nt.Signature) ) != sizeof(nt.Signature)) goto error;
+ if (nt.Signature != IMAGE_NT_SIGNATURE) goto error;
+ if (read( unix_fd, &nt.FileHeader, sizeof(nt.FileHeader) ) != sizeof(nt.FileHeader)) goto error;
+ /* zero out Optional header in the case it's not present or partial */
+ memset(&nt.OptionalHeader, 0, sizeof(nt.OptionalHeader));
+ if (read( unix_fd, &nt.OptionalHeader, nt.FileHeader.SizeOfOptionalHeader) != nt.FileHeader.SizeOfOptionalHeader) goto error;
+
+ *size = ROUND_SIZE( 0, nt.OptionalHeader.SizeOfImage );
+ *base = (void *)nt.OptionalHeader.ImageBase;
+
+#ifdef DUMP_PERESERVE
+ wld_printf( "file %s\n", pe_file );
+ wld_printf( "parsed PE image... base %x size %x\n", *base, *size );
+#endif
+
+error:
+ close( unix_fd );
+}
+
+/*
+ * Find a symbol in the symbol table of the executable loaded
+ */
+void *wld_find_symbol( const ElfW(Phdr) *phdr, int num, char *var )
+{
+ const ElfW(Dyn) *dyn = NULL;
+ void *ptr = NULL;
+ const ElfW(Phdr) *ph;
+ const ElfW(Sym) *symtab = NULL;
+ const char *strings = NULL;
+
+ /* 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 )
+ {
+ wld_printf("No PT_DYNAMIC section\n");
+ return ptr;
+ }
+
+ 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;
+#ifdef DUMP_SYMS
+ wld_printf("%x %x\n", dyn->d_tag, dyn->d_un.d_ptr );
+#endif
+ dyn++;
+ }
+
+ if( (!symtab) || (!strings) )
+ {
+ wld_printf("No symbol table found\n");
+ return ptr;
+ }
+
+ /* FIXME: this crashes if it doesn't find the symbol we want */
+ do
+ {
+ if( ( ELF32_ST_BIND(symtab->st_info) == STT_OBJECT ) &&
+ ( 0 == strcmp( strings+symtab->st_name, var ) ) )
+ {
+ ptr = (void*)symtab->st_value;
+ break;
+ }
+ symtab++;
+ }
+ while( symtab->st_name );
+
+#ifdef DUMP_SYMS
+ wld_printf("Found %s -> %x\n", strings+symtab->st_name, symtab->st_value );
+#endif
+
+ return ptr;
+}
+
+/*
+ * wld_start
+ *
+ * Repeat the actions the kernel would do when loading a dynamically linked .so
+ * Load the ELF interperter ld-linux.so and then binary itself.
+ *
+ * Note, we assume that the binary is a dynamically linked ELF shared object
+ * and that ld-linux.so is its ELF interpreter.
+ */
+void* wld_start( int argc )
+{
+ int fd, phnum = 0;
+ unsigned char buf[0x800];
+ void *start;
+ char **argv = (char**) &argc, **p, *pe_file = NULL;
+ struct link_map map;
+ ElfW(auxv_t)* av;
+ ElfW(Phdr) *elf_phdr = NULL;
+ struct wine_preload_info **wine_preload_vars;
+ static struct wine_preload_info vars;
+
+ memset( &map, 0, sizeof map );
+
+ /* skip over the parameters */
+ p = ++argv;
+#ifdef DUMP_ARG
+ {
+ int i;
+ for( i = 0; i<argc; i++ )
+ wld_printf("argv[%x] = %s\n", i, *p++);
+ if(*p++)
+ wld_printf("argv[argc] not NULL!!\n");
+ }
+#else
+ p+=(argc+1);
+#endif
+
+ /* skip over the environment, find the name of the PE file */
+ while( *p )
+ {
+ const char pefile[] = "WINEPEEXEPATH=";
+ if( 0 == memcmp( pefile, *p, sizeof pefile - 1 ) )
+ pe_file = (*p) + sizeof pefile - 1 ;
+ p++;
+ }
+
+ av = (ElfW(auxv_t)*) (p+1);
+ wld_get_auxilary( av, AT_PAGESZ, &dl_pagesize );
+#ifdef DUMP_AUX_INFO
+ wld_dump_auxilary( av );
+#endif
+
+ /* reserve memory that Wine needs */
+ vars.pe_size = 0x01000000;
+ vars.pe_address = (void*)0x00400000;
+ wld_reserve_wine_memory( pe_file, &vars.pe_address, &vars.pe_size );
+ mmap( vars.pe_address, vars.pe_size, PROT_NONE,
+ MAP_FIXED|MAP_PRIVATE|MAP_ANON, -1, 0);
+
+ /* reserve the memory that wine needs for the global heap */
+ vars.heap_size = 0x400000;
+ vars.heap_address = (void*)0x65430000;
+ mmap( vars.heap_address, vars.heap_size, PROT_NONE,
+ MAP_FIXED|MAP_PRIVATE|MAP_ANON, -1, 0);
+
+ /* load the original dynamic loader itself */
+ fd = open( LDSO_NAME, O_RDONLY, 0);
+ if( fd < 0 )
+ {
+ wld_printf( "error: fd = %x\n", fd);
+ exit(1);
+ }
+ read( fd, buf, sizeof buf );
+ start = wld_map_so( fd, buf, sizeof buf, &map );
+ if( !start )
+ exit(0);
+ close( fd );
+
+ /*
+ * Pass information to the wine loader in a static variable
+ * so it doesn't get destroyed after we leave this stack frame
+ */
+ wld_get_auxilary( av, AT_PHDR, (int*)&elf_phdr );
+ wld_get_auxilary( av, AT_PHNUM, (int*)&phnum );
+ wine_preload_vars = wld_find_symbol( elf_phdr, phnum, "wine_preload_vars" );
+ if( wine_preload_vars )
+ {
+ unsigned char *base = (void*)0x7ff81000; /* FIXME - define properly */
+ vars.preload_base = (void*) base;
+ vars.preload_size = (size_t) (_end - base);
+ *wine_preload_vars = &vars;
+ }
+
+ wld_set_auxilary( av, AT_BASE, map.l_addr );
+
+#ifdef DUMP_AUX_INFO
+ wld_printf("New auxillary info:\n");
+ wld_dump_auxilary( av );
+ wld_printf("jumping to %x\n", start);
+#endif
+
+ return start;
+}
+
+/*
+ * The _start function is the entry and exit point of this program
+ *
+ * It calls wld_start, passing a pointer to the args it receives
+ * then jumps to the address wld_start returns after removing the
+ * first argv[] value, and decrementing argc
+ */
+void _start(void);
+__asm (
+ ".align 4\n"
+ "\t.global _start\n"
+ "\t.type _start, at function\n"
+"_start:\n"
+ "\tcall wld_start\n"
+ "\tpush %eax\n"
+ "\txor %eax,%eax\n"
+ "\txor %ebx,%ebx\n"
+ "\txor %ecx,%ecx\n"
+ "\txor %edx,%edx\n"
+ "\tret\n"
+);
+
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