/*
* binfmt_misc.c
*
- * Copyright (C) 1997 Richard Günther
+ * Copyright (C) 1997 Richard Günther
*
* binfmt_misc detects binaries via a magic or filename extension and invokes
* a specified wrapper. This should obsolete binfmt_java, binfmt_em86 and
#include <linux/module.h>
#include <linux/init.h>
-
+#include <linux/sched.h>
#include <linux/binfmts.h>
#include <linux/slab.h>
#include <linux/ctype.h>
#include <linux/namei.h>
#include <linux/mount.h>
#include <linux/syscalls.h>
+#include <linux/fs.h>
#include <asm/uaccess.h>
char *iname_addr = iname;
int retval;
int fd_binary = -1;
- struct files_struct *files = NULL;
retval = -ENOEXEC;
if (!enabled)
goto _ret;
+ retval = -ENOEXEC;
+ if (bprm->recursion_depth > BINPRM_MAX_RECURSION)
+ goto _ret;
+
/* to keep locking time low, we copy the interpreter string */
read_lock(&entries_lock);
fmt = check_file(bprm);
goto _ret;
if (!(fmt->flags & MISC_FMT_PRESERVE_ARGV0)) {
- remove_arg_zero(bprm);
+ retval = remove_arg_zero(bprm);
+ if (retval)
+ goto _ret;
}
if (fmt->flags & MISC_FMT_OPEN_BINARY) {
- files = current->files;
- retval = unshare_files();
- if (retval < 0)
- goto _ret;
- if (files == current->files) {
- put_files_struct(files);
- files = NULL;
- }
/* if the binary should be opened on behalf of the
* interpreter than keep it open and assign descriptor
* to it */
fd_binary = get_unused_fd();
if (fd_binary < 0) {
retval = fd_binary;
- goto _unshare;
+ goto _ret;
}
fd_install(fd_binary, bprm->file);
if (retval < 0)
goto _error;
+ bprm->recursion_depth++;
+
retval = search_binary_handler (bprm, regs);
if (retval < 0)
goto _error;
- if (files) {
- put_files_struct(files);
- files = NULL;
- }
_ret:
return retval;
_error:
sys_close(fd_binary);
bprm->interp_flags = 0;
bprm->interp_data = 0;
-_unshare:
- if (files)
- reset_files_struct(current, files);
goto _ret;
}
if (inode) {
inode->i_mode = mode;
- inode->i_uid = 0;
- inode->i_gid = 0;
- inode->i_blocks = 0;
inode->i_atime = inode->i_mtime = inode->i_ctime =
current_fs_time(inode->i_sb);
}
bm_entry_read(struct file * file, char __user * buf, size_t nbytes, loff_t *ppos)
{
Node *e = file->f_path.dentry->d_inode->i_private;
- loff_t pos = *ppos;
ssize_t res;
char *page;
- int len;
if (!(page = (char*) __get_free_page(GFP_KERNEL)))
return -ENOMEM;
entry_status(e, page);
- len = strlen(page);
- res = -EINVAL;
- if (pos < 0)
- goto out;
- res = 0;
- if (pos >= len)
- goto out;
- if (len < pos + nbytes)
- nbytes = len - pos;
- res = -EFAULT;
- if (copy_to_user(buf, page + pos, nbytes))
- goto out;
- *ppos = pos + nbytes;
- res = nbytes;
-out:
+ res = simple_read_from_buffer(buf, nbytes, ppos, page, strlen(page));
+
free_page((unsigned long) page);
return res;
}
static ssize_t
bm_status_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
{
- char *s = enabled ? "enabled" : "disabled";
- int len = strlen(s);
- loff_t pos = *ppos;
+ char *s = enabled ? "enabled\n" : "disabled\n";
- if (pos < 0)
- return -EINVAL;
- if (pos >= len)
- return 0;
- if (len < pos + nbytes)
- nbytes = len - pos;
- if (copy_to_user(buf, s + pos, nbytes))
- return -EFAULT;
- *ppos = pos + nbytes;
- return nbytes;
+ return simple_read_from_buffer(buf, nbytes, ppos, s, strlen(s));
}
static ssize_t bm_status_write(struct file * file, const char __user * buffer,
static int bm_fill_super(struct super_block * sb, void * data, int silent)
{
static struct tree_descr bm_files[] = {
- [1] = {"status", &bm_status_operations, S_IWUSR|S_IRUGO},
- [2] = {"register", &bm_register_operations, S_IWUSR},
+ [2] = {"status", &bm_status_operations, S_IWUSR|S_IRUGO},
+ [3] = {"register", &bm_register_operations, S_IWUSR},
/* last one */ {""}
};
int err = simple_fill_super(sb, 0x42494e4d, bm_files);