diff -urNp 2.4.19rc1aa3/fs/proc/base.c mapped-base/fs/proc/base.c
--- 2.4.19rc1aa3/fs/proc/base.c	Mon Jul 15 18:47:44 2002
+++ mapped-base/fs/proc/base.c	Wed Jul 17 00:49:49 2002
@@ -444,6 +444,57 @@ static struct file_operations proc_mem_o
 	open:		mem_open,
 };
 
+static ssize_t mapbase_read(struct file * file, char * buf,
+			size_t count, loff_t *ppos)
+{
+	struct task_struct *task = file->f_dentry->d_inode->u.proc_i.task;
+	char buffer[64];
+	int len;
+	unsigned long newbase;
+	
+	sprintf(buffer, "%li", task->map_base);
+	len=strlen(buffer)+1;			
+	*ppos += len;
+	if (copy_to_user(buf, buffer, len)) 
+		len = -EFAULT;
+	
+	return (len<*ppos)?0:len;
+}
+
+static ssize_t mapbase_write(struct file * file, const char * buf,
+			 size_t count, loff_t *ppos)
+{
+	struct task_struct *task = file->f_dentry->d_inode->u.proc_i.task;
+	char buffer[64];
+	int len;
+	unsigned long newbase;
+	if (!capable(CAP_SYS_ADMIN)) return -EPERM;
+	memset(buffer, 0, 64);
+	len = count;
+	if (len>63)
+		len = 63;
+	if (copy_from_user(buffer, buf, len)) 
+		return -EFAULT;
+	
+	for (len = 0; len < 64; len++)
+		if (!buffer[len])
+			break;
+	if (len>60)
+		return -EFAULT;
+	
+	newbase = simple_strtoul(buffer, NULL, 0);
+
+	if (newbase > 0)
+		task->map_base = newbase;
+	
+	return len;
+}
+
+static struct file_operations proc_mapbase_operations = {
+	read:		mapbase_read,
+	write:		mapbase_write,
+};
+
 static struct inode_operations proc_mem_inode_operations = {
 	permission:	proc_permission,
 };
@@ -540,6 +591,7 @@ enum pid_directory_inos {
 	PROC_PID_MAPS,
 	PROC_PID_CPU,
 	PROC_PID_MOUNTS,
+	PROC_PID_MAPBASE,
 	PROC_PID_FD_DIR = 0x8000,	/* 0x8000-0xffff */
 };
 
@@ -560,6 +612,7 @@ static struct pid_entry base_stuff[] = {
   E(PROC_PID_ROOT,	"root",		S_IFLNK|S_IRWXUGO),
   E(PROC_PID_EXE,	"exe",		S_IFLNK|S_IRWXUGO),
   E(PROC_PID_MOUNTS,	"mounts",	S_IFREG|S_IRUGO),
+  E(PROC_PID_MAPBASE,	"mapped_base",	S_IFREG|S_IRUSR|S_IWUSR),
   {0,0,NULL,0}
 };
 #undef E
@@ -912,6 +965,9 @@ static struct dentry *proc_base_lookup(s
 			inode->i_fop = &proc_info_file_operations;
 			inode->u.proc_i.op.proc_read = proc_pid_statm;
 			break;
+		case PROC_PID_MAPBASE:
+			inode->i_fop = &proc_mapbase_operations;
+			break;
 		case PROC_PID_MAPS:
 			inode->i_fop = &proc_maps_operations;
 			break;
diff -urNp 2.4.19rc1aa3/include/asm-i386/processor.h mapped-base/include/asm-i386/processor.h
--- 2.4.19rc1aa3/include/asm-i386/processor.h	Wed Jul 17 00:43:06 2002
+++ mapped-base/include/asm-i386/processor.h	Wed Jul 17 00:46:53 2002
@@ -275,11 +275,7 @@ extern unsigned int mca_pentium_flag;
 /* This decides where the kernel will search for a free chunk of vm
  * space during mmap's.
  */
-#ifndef CONFIG_05GB
-#define TASK_UNMAPPED_BASE	(TASK_SIZE / 3)
-#else
-#define TASK_UNMAPPED_BASE	(TASK_SIZE / 16)
-#endif
+#define TASK_UNMAPPED_BASE	(current->map_base)
 
 /*
  * Size of io_bitmap in longwords: 32 is ports 0-0x3ff.
diff -urNp 2.4.19rc1aa3/include/linux/sched.h mapped-base/include/linux/sched.h
--- 2.4.19rc1aa3/include/linux/sched.h	Wed Jul 17 00:43:07 2002
+++ mapped-base/include/linux/sched.h	Wed Jul 17 00:59:44 2002
@@ -441,6 +441,9 @@ struct task_struct {
 /* Protection of (de-)allocation: mm, files, fs, tty */
 	spinlock_t alloc_lock;
 
+/* TASK_UNMAPPED_BASE value */
+	unsigned long map_base;
+
 /* journalling filesystem info */
 	void *journal_info;
 };
@@ -494,6 +497,12 @@ asmlinkage long sys_sched_yield(void);
  */
 extern struct exec_domain	default_exec_domain;
 
+#ifndef CONFIG_05GB
+#define __TASK_UNMAPPED_BASE	(TASK_SIZE / 3)
+#else
+#define __TASK_UNMAPPED_BASE	(TASK_SIZE / 16)
+#endif
+
 /*
  *  INIT_TASK is used to set up the first task table, touch at
  * your own risk!. Base=0, limit=0x1fffff (=2MB)
@@ -539,6 +548,7 @@ extern struct exec_domain	default_exec_d
     blocked:		{{0}},						\
     alloc_lock:		SPIN_LOCK_UNLOCKED,				\
     journal_info:	NULL,						\
+    map_base:		__TASK_UNMAPPED_BASE,				\
 }