x

1 files changed, 0 insertions, 787 deletions

diff --git a/kernel/redir_hack.c b/kernel/redir_hack.c
deleted file mode 100644
index 4c91a4f..0000000
--- a/kernel/redir_hack.c
+++ /dev/null
@@ -1,787 +0,0 @@
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/unistd.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include <linux/fs.h>
-#include <linux/smp_lock.h>
-#include <asm/uaccess.h>
-#include <linux/coda_psdev.h>
-#include <linux/version.h>
-
-#if 0
-#define DEB(X) printk X
-#else
-#define DEB(X)
-#endif
-
-#define REDIR_VERSION "0.3"
-
-extern void *sys_call_table[];
-
-typedef asmlinkage int (*chdir_func)    (const char *);
-typedef asmlinkage int (*stat_func)     (const char *, struct stat *);
-typedef asmlinkage int (*access_func)   (const char *, int);
-typedef asmlinkage int (*open_func)     (const char *, int, int);
-typedef asmlinkage int (*readlink_func) (const char *, char *, int);
-typedef asmlinkage int (*getcwd_func)   (char *, unsigned long);
-
-static chdir_func    orig_chdir;
-static stat_func     orig_stat;
-static stat_func     orig_lstat;
-static access_func   orig_access;
-static open_func     orig_open;
-static readlink_func orig_readlink;
-static getcwd_func   orig_getcwd;
-
-typedef asmlinkage long (*stat64_func)   (const char *, struct stat64 *, long);
-
-static stat64_func   orig_stat64;
-static stat64_func   orig_lstat64;
-
-#ifdef __i386__
-typedef asmlinkage int (*execve_func) (struct pt_regs);
-
-static execve_func orig_execve;
-#endif
-
-#define AVFS_MAGIC_CHAR '#'
-
-#define PF_AVFS 0x00008000
-
-#define OVERLAY_BASE "/mnt/tmp"
-
-#define path_ok(pwd) (pwd->d_parent == pwd || !list_empty(&pwd->d_hash))
-
-static char *path_pwd(char *page)
-{
-        return d_path(current->fs->pwd, current->fs->pwdmnt, page, PAGE_SIZE);
-}
-
-static int a_path_walk(const char *pathname, int flags, struct nameidata *nd)
-{
-        int error;
-
-        error = 0;
-        if (path_init(pathname, flags, nd))
-                error = path_walk(pathname, nd);
-
-        return error;
-}
-
-static void a_path_release(struct nameidata *nd)
-{
-        dput(nd->dentry);
-        mntput(nd->mnt);
-}
-
-static char *resolv_virt(const char *pathname, int must_exist, int flags)
-{
-        struct nameidata root;
-	struct nameidata nd;
-        struct dentry *origroot;
-        struct vfsmount *origrootmnt;
-	char *newpathname = NULL;
-	char *page = NULL;
-	char *path = NULL;
-	int pathlen = 0;
-        int error;
-        int newflags;
-        char overlay_dir[128];
-        unsigned overlay_dir_len;
-        
-        sprintf(overlay_dir, "%s/%u", OVERLAY_BASE, current->fsuid);
-        overlay_dir_len = strlen(overlay_dir);
-        
-	lock_kernel();
-
-	DEB((KERN_INFO "resolve_virt pathname: '%s'\n", 
-	       pathname ? pathname : "(null)"));
-
-        error = a_path_walk(overlay_dir, LOOKUP_POSITIVE|LOOKUP_FOLLOW, &root);
-        if(error)
-            goto out;
-
-	origroot = current->fs->root;
-        origrootmnt = current->fs->rootmnt;
-
-	current->fs->root = root.dentry;
-        current->fs->rootmnt = root.mnt;
-	
-        newflags = flags;
-        if(must_exist)
-                newflags |= LOOKUP_POSITIVE;
-
-        error  = a_path_walk(pathname, newflags, &nd);
-	if(!error) {
-		if(path_ok(nd.dentry)) {
-			page = (char *) __get_free_page(GFP_USER);
-			if(page) {
-				path = d_path(nd.dentry, nd.mnt, page,
-                                              PAGE_SIZE);
-				DEB((KERN_INFO "resolve_virt path = '%s'\n",
-				     path));
-				pathlen = (unsigned int) page + PAGE_SIZE - 
-					(unsigned int) path;
-			}
-		}
-                a_path_release(&nd);
-	}
-
-	current->fs->root = origroot;
-        current->fs->rootmnt = origrootmnt;
-
-        a_path_release(&root);
-
-	if(path) {
-		int isvirtual;
-
-                error  = a_path_walk(path, flags, &nd);
-		if(!error) {
-			if(nd.dentry->d_inode)
-				isvirtual = 0;
-			else if(must_exist)
-				isvirtual = 1;
-			else if(strchr(path, AVFS_MAGIC_CHAR))
-				isvirtual = 1;
-			else 
-				isvirtual = 0;
-
-                        a_path_release(&nd);
-		}
-		else {
-			isvirtual = 1;
-		}
-
-		if(!isvirtual) {
-			newpathname = kmalloc(pathlen + 1, GFP_USER);
-			if(newpathname)
-				strncpy(newpathname, path, pathlen);
-		}
-		else {
-			newpathname = kmalloc(overlay_dir_len + pathlen + 1,
-					      GFP_USER);
-
-			if(newpathname) {
-				strcpy(newpathname, overlay_dir);
-				strncat(newpathname, path, pathlen);
-			}
-		}
-	}
-
-	if(page)
-		free_page((unsigned long) page);
-
-
-	DEB((KERN_INFO "resolve_virt newpathname: '%s'\n", 
-	     newpathname ? newpathname : "(null)"));
-
-  out:
-	unlock_kernel();
-	return newpathname;
-}
-
-
-#define FUSE_SUPER_MAGIC 0x65735546
-
-#define cwd_virtual() \
-	(current->fs->pwd->d_sb->s_magic == FUSE_SUPER_MAGIC)
-
-static char *get_abs_path(const char *filename)
-{
-	char *cwd;
-	int cwdlen, fnamelen;
-	char *abspath, *s;
-	char *page;
-        char overlay_dir[128];
-        unsigned overlay_dir_len;
-        
-        sprintf(overlay_dir, "/mnt/avfs/%010u", current->fsuid);
-        overlay_dir_len = strlen(overlay_dir);
-
-        if(!path_ok(current->fs->pwd))
-                return NULL;
-
-        page = (char *) __get_free_page(GFP_USER);
-	if(!page)
-		return NULL;
-
-        cwd = path_pwd(page);
-	cwdlen = (unsigned int) page + PAGE_SIZE - (unsigned int) cwd - 1;
-	if(cwd_virtual() && cwdlen > overlay_dir_len) {
-		cwd += overlay_dir_len;
-		cwdlen -= overlay_dir_len;
-	}
-		
-
-	fnamelen = strlen(filename);
-
-	abspath = kmalloc(cwdlen + 1 + fnamelen + 1, GFP_USER);
-	if(abspath) {
-		s = abspath;
-		strncpy(s, cwd, cwdlen);
-		s += cwdlen;
-		*s++ = '/';
-		strncpy(s, filename, fnamelen + 1);
-	}
-	free_page((unsigned long) page);
-	
-	return abspath;
-}
-
-static char *resolve_name(const char *kfilename, int must_exist, int flags)
-{
-	char *tmp;
-	char *newfilename;		
-
-	tmp = getname(kfilename);
-	if(IS_ERR(tmp))
-		return tmp;
-
-
-	if((tmp[0] != '/' && cwd_virtual()) || strchr(tmp, AVFS_MAGIC_CHAR)) {
-		DEB((KERN_INFO "resolve_name: %s (%i/%s)\n", tmp, 
-		     current->pid,
-		     (current->flags & PF_AVFS) ? "on" : "off"));
-
-		if(strcmp(tmp, "/#avfs-on") == 0) {
-			printk(KERN_INFO "AVFS ON  (pid: %i)\n",
-			       current->pid);
-			current->flags |= PF_AVFS;
-			newfilename = ERR_PTR(-EEXIST);
-		}
-		else if(!(current->flags & PF_AVFS))
-			newfilename = NULL;
-		else if(strcmp(tmp, "/#avfs-off") == 0) {
-			printk(KERN_INFO "AVFS OFF (pid: %i)\n",
-			       current->pid);
-			current->flags &= ~PF_AVFS;
-			newfilename = ERR_PTR(-EEXIST);
-		}
-		else {
-			if(tmp[0] == '/') {
-				newfilename = resolv_virt(tmp, must_exist, flags);
-			}
-			else {
-				char *abspath;
-
-				abspath = get_abs_path(tmp);
-				if(abspath) {
-					newfilename = resolv_virt(abspath, must_exist, flags);
-					kfree(abspath);
-				}
-				else
-					newfilename = NULL;
-			}
-		}
-	}
-	else 
-		newfilename = NULL;
-	
-	putname(tmp);
-	
-	return newfilename;
-}
-
-asmlinkage int virt_chdir(const char *filename)
-{
-	int ret;
-	mm_segment_t old_fs;
-	char *newfilename;
-	
-	if(!cwd_virtual()) {
-		ret = (*orig_chdir)(filename);
-		if(ret != -ENOENT) 
-			return ret;
-	}
-	else 
-		ret = 0;
-
-	newfilename = resolve_name(filename, 1, 1);
-	if(!newfilename) {
-		if(ret)
-			return ret;
-		else
-			return (*orig_chdir)(filename);
-	}
-	if(IS_ERR(newfilename))
-			return PTR_ERR(newfilename);
-
-
-	DEB((KERN_INFO "CHDIR: trying '%s'\n", newfilename));
-		
-	old_fs = get_fs();
-	set_fs(get_ds());
-	ret =  (*orig_chdir)(newfilename);
-	set_fs(old_fs);
-	kfree(newfilename);
-
-	DEB((KERN_INFO "CHDIR: result %i\n", ret));
-	
-	return ret;
-}
-
-static int do_orig_stat(stat_func sfunc, const char *filename,
-			struct stat *statbuf)
-{
-	int ret;
-	mm_segment_t old_fs;
-	struct stat locbuf;
-
-	old_fs = get_fs();
-	set_fs(get_ds());
-	ret =  (*sfunc)(filename, &locbuf);
-	set_fs(old_fs);
-
-	if(ret == 0)
-		ret = (copy_to_user(statbuf, &locbuf, sizeof(locbuf)) ? 
-		       -EFAULT : 0);
-
-	return ret;
-}
-
-asmlinkage int virt_stat(const char *filename, struct stat *statbuf)
-{
-	int ret;
-	char *newfilename;
-
-	if(!cwd_virtual()) {
-		ret = (*orig_stat)(filename, statbuf);
-		if(ret != -ENOENT) 
-			return ret;
-	}
-	else 
-		ret = 0;
-
-	newfilename = resolve_name(filename, 1, 1);
-	if(!newfilename) {
-		if(ret)
-			return ret;
-		else
-			return (*orig_stat)(filename, statbuf);
-	}
-	if(IS_ERR(newfilename))
-			return PTR_ERR(newfilename);
-
-	DEB((KERN_INFO "STAT: trying '%s'\n", newfilename));
-
-	ret = do_orig_stat(orig_stat, newfilename, statbuf);
-	kfree(newfilename);
-
-	DEB((KERN_INFO "STAT: result %i\n", ret));
-
-	return ret;
-}
-
-asmlinkage int virt_lstat(const char *filename, struct stat *statbuf)
-{
-	int ret;
-	char *newfilename;
-
-	if(!cwd_virtual()) {
-		ret = (*orig_lstat)(filename, statbuf);
-		if(ret != -ENOENT) 
-			return ret;
-	}
-	else 
-		ret = 0;
-
-	newfilename = resolve_name(filename, 1, 0);
-	if(!newfilename) {
-		if(ret)
-			return ret;
-		else
-			return (*orig_lstat)(filename, statbuf);
-	}
-	if(IS_ERR(newfilename))
-			return PTR_ERR(newfilename);
-
-	DEB((KERN_INFO "LSTAT: trying '%s'\n", newfilename));
-
-	ret = do_orig_stat(orig_lstat, newfilename, statbuf);
-	kfree(newfilename);
-
-	DEB((KERN_INFO "LSTAT: result %i\n", ret));
-
-	return ret;
-}
-
-
-asmlinkage int virt_access(const char *filename, int mode)
-{
-	int ret;
-	mm_segment_t old_fs;
-	char *newfilename;
-	
-	if(!cwd_virtual()) {
-		ret = (*orig_access)(filename, mode);
-		if(ret != -ENOENT) 
-			return ret;
-	}
-	else 
-		ret = 0;
-
-	newfilename = resolve_name(filename, 1, 1);
-	if(!newfilename) {
-		if(ret)
-			return ret;
-		else
-			return (*orig_access)(filename, mode);
-	}
-	if(IS_ERR(newfilename))
-			return PTR_ERR(newfilename);
-
-	DEB((KERN_INFO "ACCESS: trying '%s'\n", newfilename));
-		
-	old_fs = get_fs();
-	set_fs(get_ds());
-	ret = (*orig_access)(newfilename, mode);
-	set_fs(old_fs);
-	kfree(newfilename);
-
-	DEB((KERN_INFO "ACCESS: result %i\n", ret));
-	
-	return ret;
-}
-
-asmlinkage int virt_open(const char *filename, int flags, int mode)
-{
-	int ret;
-	mm_segment_t old_fs;
-	char *newfilename;
-	
-	if(!cwd_virtual()) {
-		ret = (*orig_open)(filename, flags, mode);
-		if(ret != -ENOENT) 
-			return ret;
-	}
-	else 
-		ret = 0;
-
-	newfilename = resolve_name(filename, 1, 1);
-	if(!newfilename) {
-		if(ret)
-			return ret;
-		else
-			return (*orig_open)(filename, flags, mode);
-	}
-	if(IS_ERR(newfilename))
-			return PTR_ERR(newfilename);
-
-	DEB((KERN_INFO "OPEN: trying '%s'\n", newfilename));
-		
-	old_fs = get_fs();
-	set_fs(get_ds());
-	ret = (*orig_open)(newfilename, flags, mode);
-	set_fs(old_fs);
-	kfree(newfilename);
-
-	DEB((KERN_INFO "OPEN: result %i\n", ret));
-	
-	return ret;
-}
-
-asmlinkage int virt_readlink(const char *filename, char *buf, int bufsiz)
-{
-	int ret;
-	mm_segment_t old_fs;
-	char *newfilename;
-	char *locbuf;
-	int len;
-	
-	if(!cwd_virtual()) {
-		ret = (*orig_readlink)(filename, buf, bufsiz);
-		if(ret != -ENOENT) 
-			return ret;
-	}
-	else 
-		ret = 0;
-
-	newfilename = resolve_name(filename, 1, 0);
-	if(!newfilename) {
-		if(ret)
-			return ret;
-		else
-			return (*orig_readlink)(filename, buf, bufsiz);
-	}
-	if(IS_ERR(newfilename))
-			return PTR_ERR(newfilename);
-
-	DEB((KERN_INFO "READLINK: trying '%s'\n", newfilename));
-
-	/* bufsiz is legal (already checked by sys_readlink) */
-	len = bufsiz;
-	if(bufsiz > PAGE_SIZE)
-		len = PAGE_SIZE;
-			
-	locbuf = (char *) __get_free_page(GFP_USER);
-			
-	ret = -ENOMEM;
-	if(locbuf) {
-		old_fs = get_fs();
-		set_fs(get_ds());
-		ret =  (*orig_readlink)(newfilename, locbuf, len);
-		set_fs(old_fs);
-
-		if(ret >= 0)
-			if(copy_to_user(buf, locbuf, len))
-				ret = -EFAULT;
-		free_page((unsigned long) locbuf);
-	}
-	kfree(newfilename);
-
-	DEB((KERN_INFO "READLINK: result %i\n", ret));
-	
-	return ret;
-}
-
-asmlinkage int virt_getcwd(char *buf, unsigned long size)
-{
-	int ret;
-	char *cwd;
-	unsigned long cwdlen;
-	char *page;
-	char *newcwd;
-	unsigned long newlen;
-        char overlay_dir[128];
-        unsigned overlay_dir_len;
-        	
-	ret = (*orig_getcwd)(buf, size);
-
-	if(!cwd_virtual() || ret < 0)
-		return ret;
-		
-	if(!path_ok(current->fs->pwd))
-		return -ENOENT;
-	
-	page = (char *) __get_free_page(GFP_USER);
-	if(!page)
-		return -ENOMEM;
-	
-        cwd = path_pwd(page);
-	cwdlen = PAGE_SIZE + (page - cwd) - 1;
-	
-        sprintf(overlay_dir, "/mnt/avfs/%010u", current->fsuid);
-        overlay_dir_len = strlen(overlay_dir);
-
-	if(cwdlen >= overlay_dir_len && 
-	   strncmp(cwd, overlay_dir, overlay_dir_len) == 0) {
-		if(cwdlen == overlay_dir_len) {
-			newcwd = "/";
-			newlen = 1;
-		}
-		else {
-			newcwd = cwd + overlay_dir_len;
-			newlen = cwdlen - overlay_dir_len;
-		}
-
-		ret = -ERANGE;
-		if(newlen + 1 <= size) {
-			ret = newlen + 1;
-			if(copy_to_user(buf, newcwd, newlen + 1))
-				ret = -EFAULT;
-		}
-	}
-	free_page((unsigned long) page);
-
-	return ret;
-}
-
-
-static long do_orig_stat64(stat64_func sfunc, const char *filename,
-			  struct stat64 * statbuf, long flags)
-{
-	long ret;
-	mm_segment_t old_fs;
-	struct stat64 locbuf;
-
-	old_fs = get_fs();
-	set_fs(get_ds());
-	ret =  (*sfunc)(filename, &locbuf, flags);
-	set_fs(old_fs);
-
-	if(ret == 0)
-		ret = (copy_to_user(statbuf, &locbuf, sizeof(locbuf)) ? 
-		       -EFAULT : 0);
-
-	return ret;
-}
-
-asmlinkage long virt_stat64(char * filename, struct stat64 * statbuf, long flags)
-{
-	long ret;
-	char *newfilename;
-
-	if(!cwd_virtual()) {
-		ret = (*orig_stat64)(filename, statbuf, flags);
-		if(ret != -ENOENT) 
-			return ret;
-	}
-	else 
-		ret = 0;
-
-	newfilename = resolve_name(filename, 1, 1);
-	if(!newfilename) {
-		if(ret)
-			return ret;
-		else
-			return (*orig_stat64)(filename, statbuf, flags);
-	}
-	if(IS_ERR(newfilename))
-			return PTR_ERR(newfilename);
-
-	DEB((KERN_INFO "STAT64: trying '%s'\n", newfilename));
-
-	ret = do_orig_stat64(orig_stat64, newfilename, statbuf, flags);
-	kfree(newfilename);
-
-	DEB((KERN_INFO "STAT64: result %li\n", ret));
-
-	return ret;
-}
-
-asmlinkage long virt_lstat64(char * filename, struct stat64 * statbuf, long flags)
-{
-	long ret;
-	char *newfilename;
-
-	if(!cwd_virtual()) {
-		ret = (*orig_lstat64)(filename, statbuf, flags);
-		if(ret != -ENOENT) 
-			return ret;
-	}
-	else 
-		ret = 0;
-
-	newfilename = resolve_name(filename, 1, 0);
-	if(!newfilename) {
-		if(ret)
-			return ret;
-		else
-			return (*orig_lstat64)(filename, statbuf, flags);
-	}
-	if(IS_ERR(newfilename))
-			return PTR_ERR(newfilename);
-
-	DEB((KERN_INFO "LSTAT64: trying '%s'\n", newfilename));
-
-	ret = do_orig_stat64(orig_lstat64, newfilename, statbuf, flags);
-	kfree(newfilename);
-
-	DEB((KERN_INFO "LSTAT64: result %li\n", ret));
-
-	return ret;
-}
-
-#ifdef __i386__
-
-asmlinkage int real_execve(struct pt_regs *regs)
-{
-	int error;
-	char * filename;
-
-	filename = getname((char *) regs->ebx);
-	error = PTR_ERR(filename);
-	if (IS_ERR(filename))
-		goto out;
-	error = do_execve(filename, (char **) regs->ecx, (char **) regs->edx, regs);
-	if (error == 0)
-		current->ptrace &= ~PT_DTRACE;
-	putname(filename);
-
-out:
-	return error;
-}
-
-asmlinkage int virt_execve(struct pt_regs regs)
-{
-	int ret;
-	char *newfilename;
-	char *filename = (char *) regs.ebx;
-
-	if(!cwd_virtual()) {
-		ret = real_execve(&regs);
-		if(ret != -ENOENT) 
-			return ret;
-	}
-	else 
-		ret = 0;
-
-	newfilename = resolve_name(filename, 1, 1);
-	if(!newfilename) {
-		if(ret)
-			return ret;
-		else
-			return real_execve(&regs);
-	}
-	if(IS_ERR(newfilename))
-			return PTR_ERR(newfilename);
-
-	DEB((KERN_INFO "EXECVE: trying '%s'\n", newfilename));
-
-	ret = do_execve(newfilename, (char **) regs.ecx, (char **) regs.edx,
-			&regs);
-	if (ret == 0)
-		current->ptrace &= ~PT_DTRACE;
-	kfree(newfilename);
-
-	DEB((KERN_INFO "EXECVE: result %i\n", ret));
-
-	return ret;
-}
-#endif /* __i386__ */
-
-void *replace_syscall(int index, void *new_syscall)
-{
-	void *orig_syscall = sys_call_table[index];
-
-	printk(KERN_INFO "replacing syscall nr. %3i [%p] with [%p]\n", 
-	       index, orig_syscall, new_syscall);
-	sys_call_table[index] = new_syscall;
-	
-	return orig_syscall;
-}
-
-int init_module(void)
-{
-    printk(KERN_INFO "redir init (version %s)\n", REDIR_VERSION);
-
-    orig_chdir    = replace_syscall(__NR_chdir,    virt_chdir);
-    orig_stat     = replace_syscall(__NR_stat,     virt_stat);
-    orig_lstat    = replace_syscall(__NR_lstat,    virt_lstat);
-    orig_access   = replace_syscall(__NR_access,   virt_access);
-    orig_open     = replace_syscall(__NR_open,     virt_open);
-    orig_readlink = replace_syscall(__NR_readlink, virt_readlink);
-    orig_getcwd   = replace_syscall(__NR_getcwd,   virt_getcwd);
-
-    orig_stat64   = replace_syscall(__NR_stat64,   virt_stat64);
-    orig_lstat64  = replace_syscall(__NR_lstat64,  virt_lstat64);
-
-#ifdef __i386__
-    orig_execve   = replace_syscall(__NR_execve,   virt_execve);
-#endif
-
-    return 0;
-}
-
-
-void cleanup_module(void)
-{
-    printk(KERN_INFO "redir cleanup\n");
-   
-    replace_syscall(__NR_chdir,    orig_chdir);
-    replace_syscall(__NR_stat,     orig_stat);
-    replace_syscall(__NR_lstat,    orig_lstat);
-    replace_syscall(__NR_access,   orig_access);
-    replace_syscall(__NR_open,     orig_open);
-    replace_syscall(__NR_readlink, orig_readlink);
-    replace_syscall(__NR_getcwd,   orig_getcwd);
-
-    replace_syscall(__NR_stat64,   orig_stat64);
-    replace_syscall(__NR_lstat64,  orig_lstat64);
-
-#ifdef __i386__
-    replace_syscall(__NR_execve,   orig_execve);
-#endif
-
-}