778 строки
16 KiB
C
778 строки
16 KiB
C
/*
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* binfmt_misc.c
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*
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* Copyright (C) 1997 Richard Günther
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*
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* binfmt_misc detects binaries via a magic or filename extension and invokes
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* a specified wrapper. This should obsolete binfmt_java, binfmt_em86 and
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* binfmt_mz.
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*
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* 1997-04-25 first version
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* [...]
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* 1997-05-19 cleanup
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* 1997-06-26 hpa: pass the real filename rather than argv[0]
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* 1997-06-30 minor cleanup
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* 1997-08-09 removed extension stripping, locking cleanup
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* 2001-02-28 AV: rewritten into something that resembles C. Original didn't.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/binfmts.h>
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#include <linux/slab.h>
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#include <linux/ctype.h>
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#include <linux/file.h>
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#include <linux/pagemap.h>
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#include <linux/namei.h>
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#include <linux/mount.h>
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#include <linux/syscalls.h>
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#include <asm/uaccess.h>
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enum {
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VERBOSE_STATUS = 1 /* make it zero to save 400 bytes kernel memory */
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};
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static LIST_HEAD(entries);
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static int enabled = 1;
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enum {Enabled, Magic};
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#define MISC_FMT_PRESERVE_ARGV0 (1<<31)
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#define MISC_FMT_OPEN_BINARY (1<<30)
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#define MISC_FMT_CREDENTIALS (1<<29)
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typedef struct {
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struct list_head list;
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unsigned long flags; /* type, status, etc. */
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int offset; /* offset of magic */
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int size; /* size of magic/mask */
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char *magic; /* magic or filename extension */
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char *mask; /* mask, NULL for exact match */
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char *interpreter; /* filename of interpreter */
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char *name;
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struct dentry *dentry;
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} Node;
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static DEFINE_RWLOCK(entries_lock);
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static struct file_system_type bm_fs_type;
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static struct vfsmount *bm_mnt;
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static int entry_count;
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/*
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* Check if we support the binfmt
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* if we do, return the node, else NULL
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* locking is done in load_misc_binary
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*/
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static Node *check_file(struct linux_binprm *bprm)
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{
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char *p = strrchr(bprm->interp, '.');
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struct list_head *l;
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list_for_each(l, &entries) {
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Node *e = list_entry(l, Node, list);
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char *s;
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int j;
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if (!test_bit(Enabled, &e->flags))
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continue;
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if (!test_bit(Magic, &e->flags)) {
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if (p && !strcmp(e->magic, p + 1))
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return e;
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continue;
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}
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s = bprm->buf + e->offset;
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if (e->mask) {
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for (j = 0; j < e->size; j++)
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if ((*s++ ^ e->magic[j]) & e->mask[j])
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break;
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} else {
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for (j = 0; j < e->size; j++)
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if ((*s++ ^ e->magic[j]))
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break;
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}
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if (j == e->size)
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return e;
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}
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return NULL;
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}
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/*
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* the loader itself
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*/
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static int load_misc_binary(struct linux_binprm *bprm, struct pt_regs *regs)
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{
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Node *fmt;
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struct file * interp_file = NULL;
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char iname[BINPRM_BUF_SIZE];
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char *iname_addr = iname;
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int retval;
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int fd_binary = -1;
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struct files_struct *files = NULL;
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retval = -ENOEXEC;
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if (!enabled)
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goto _ret;
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/* to keep locking time low, we copy the interpreter string */
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read_lock(&entries_lock);
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fmt = check_file(bprm);
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if (fmt)
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strlcpy(iname, fmt->interpreter, BINPRM_BUF_SIZE);
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read_unlock(&entries_lock);
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if (!fmt)
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goto _ret;
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if (!(fmt->flags & MISC_FMT_PRESERVE_ARGV0)) {
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remove_arg_zero(bprm);
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}
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if (fmt->flags & MISC_FMT_OPEN_BINARY) {
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files = current->files;
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retval = unshare_files();
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if (retval < 0)
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goto _ret;
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if (files == current->files) {
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put_files_struct(files);
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files = NULL;
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}
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/* if the binary should be opened on behalf of the
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* interpreter than keep it open and assign descriptor
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* to it */
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fd_binary = get_unused_fd();
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if (fd_binary < 0) {
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retval = fd_binary;
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goto _unshare;
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}
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fd_install(fd_binary, bprm->file);
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/* if the binary is not readable than enforce mm->dumpable=0
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regardless of the interpreter's permissions */
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if (file_permission(bprm->file, MAY_READ))
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bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP;
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allow_write_access(bprm->file);
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bprm->file = NULL;
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/* mark the bprm that fd should be passed to interp */
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bprm->interp_flags |= BINPRM_FLAGS_EXECFD;
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bprm->interp_data = fd_binary;
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} else {
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allow_write_access(bprm->file);
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fput(bprm->file);
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bprm->file = NULL;
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}
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/* make argv[1] be the path to the binary */
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retval = copy_strings_kernel (1, &bprm->interp, bprm);
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if (retval < 0)
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goto _error;
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bprm->argc++;
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/* add the interp as argv[0] */
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retval = copy_strings_kernel (1, &iname_addr, bprm);
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if (retval < 0)
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goto _error;
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bprm->argc ++;
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bprm->interp = iname; /* for binfmt_script */
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interp_file = open_exec (iname);
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retval = PTR_ERR (interp_file);
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if (IS_ERR (interp_file))
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goto _error;
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bprm->file = interp_file;
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if (fmt->flags & MISC_FMT_CREDENTIALS) {
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/*
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* No need to call prepare_binprm(), it's already been
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* done. bprm->buf is stale, update from interp_file.
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*/
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memset(bprm->buf, 0, BINPRM_BUF_SIZE);
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retval = kernel_read(bprm->file, 0, bprm->buf, BINPRM_BUF_SIZE);
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} else
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retval = prepare_binprm (bprm);
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if (retval < 0)
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goto _error;
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retval = search_binary_handler (bprm, regs);
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if (retval < 0)
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goto _error;
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if (files) {
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put_files_struct(files);
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files = NULL;
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}
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_ret:
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return retval;
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_error:
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if (fd_binary > 0)
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sys_close(fd_binary);
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bprm->interp_flags = 0;
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bprm->interp_data = 0;
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_unshare:
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if (files)
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reset_files_struct(current, files);
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goto _ret;
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}
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/* Command parsers */
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/*
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* parses and copies one argument enclosed in del from *sp to *dp,
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* recognising the \x special.
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* returns pointer to the copied argument or NULL in case of an
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* error (and sets err) or null argument length.
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*/
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static char *scanarg(char *s, char del)
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{
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char c;
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while ((c = *s++) != del) {
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if (c == '\\' && *s == 'x') {
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s++;
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if (!isxdigit(*s++))
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return NULL;
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if (!isxdigit(*s++))
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return NULL;
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}
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}
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return s;
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}
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static int unquote(char *from)
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{
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char c = 0, *s = from, *p = from;
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while ((c = *s++) != '\0') {
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if (c == '\\' && *s == 'x') {
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s++;
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c = toupper(*s++);
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*p = (c - (isdigit(c) ? '0' : 'A' - 10)) << 4;
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c = toupper(*s++);
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*p++ |= c - (isdigit(c) ? '0' : 'A' - 10);
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continue;
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}
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*p++ = c;
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}
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return p - from;
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}
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static char * check_special_flags (char * sfs, Node * e)
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{
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char * p = sfs;
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int cont = 1;
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/* special flags */
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while (cont) {
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switch (*p) {
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case 'P':
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p++;
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e->flags |= MISC_FMT_PRESERVE_ARGV0;
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break;
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case 'O':
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p++;
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e->flags |= MISC_FMT_OPEN_BINARY;
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break;
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case 'C':
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p++;
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/* this flags also implies the
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open-binary flag */
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e->flags |= (MISC_FMT_CREDENTIALS |
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MISC_FMT_OPEN_BINARY);
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break;
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default:
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cont = 0;
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}
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}
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return p;
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}
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/*
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* This registers a new binary format, it recognises the syntax
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* ':name:type:offset:magic:mask:interpreter:flags'
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* where the ':' is the IFS, that can be chosen with the first char
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*/
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static Node *create_entry(const char __user *buffer, size_t count)
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{
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Node *e;
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int memsize, err;
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char *buf, *p;
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char del;
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/* some sanity checks */
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err = -EINVAL;
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if ((count < 11) || (count > 256))
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goto out;
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err = -ENOMEM;
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memsize = sizeof(Node) + count + 8;
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e = kmalloc(memsize, GFP_USER);
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if (!e)
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goto out;
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p = buf = (char *)e + sizeof(Node);
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memset(e, 0, sizeof(Node));
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if (copy_from_user(buf, buffer, count))
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goto Efault;
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del = *p++; /* delimeter */
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memset(buf+count, del, 8);
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e->name = p;
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p = strchr(p, del);
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if (!p)
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goto Einval;
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*p++ = '\0';
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if (!e->name[0] ||
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!strcmp(e->name, ".") ||
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!strcmp(e->name, "..") ||
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strchr(e->name, '/'))
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goto Einval;
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switch (*p++) {
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case 'E': e->flags = 1<<Enabled; break;
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case 'M': e->flags = (1<<Enabled) | (1<<Magic); break;
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default: goto Einval;
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}
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if (*p++ != del)
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goto Einval;
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if (test_bit(Magic, &e->flags)) {
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char *s = strchr(p, del);
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if (!s)
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goto Einval;
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*s++ = '\0';
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e->offset = simple_strtoul(p, &p, 10);
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if (*p++)
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goto Einval;
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e->magic = p;
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p = scanarg(p, del);
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if (!p)
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goto Einval;
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p[-1] = '\0';
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if (!e->magic[0])
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goto Einval;
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e->mask = p;
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p = scanarg(p, del);
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if (!p)
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goto Einval;
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p[-1] = '\0';
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if (!e->mask[0])
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e->mask = NULL;
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e->size = unquote(e->magic);
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if (e->mask && unquote(e->mask) != e->size)
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goto Einval;
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if (e->size + e->offset > BINPRM_BUF_SIZE)
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goto Einval;
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} else {
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p = strchr(p, del);
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if (!p)
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goto Einval;
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*p++ = '\0';
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e->magic = p;
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p = strchr(p, del);
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if (!p)
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goto Einval;
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*p++ = '\0';
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if (!e->magic[0] || strchr(e->magic, '/'))
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goto Einval;
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p = strchr(p, del);
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if (!p)
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goto Einval;
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*p++ = '\0';
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}
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e->interpreter = p;
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p = strchr(p, del);
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if (!p)
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goto Einval;
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*p++ = '\0';
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if (!e->interpreter[0])
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goto Einval;
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p = check_special_flags (p, e);
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if (*p == '\n')
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p++;
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if (p != buf + count)
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goto Einval;
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return e;
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out:
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return ERR_PTR(err);
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Efault:
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kfree(e);
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return ERR_PTR(-EFAULT);
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Einval:
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kfree(e);
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return ERR_PTR(-EINVAL);
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}
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/*
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* Set status of entry/binfmt_misc:
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* '1' enables, '0' disables and '-1' clears entry/binfmt_misc
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*/
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static int parse_command(const char __user *buffer, size_t count)
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{
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char s[4];
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if (!count)
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return 0;
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if (count > 3)
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return -EINVAL;
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if (copy_from_user(s, buffer, count))
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return -EFAULT;
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if (s[count-1] == '\n')
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count--;
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if (count == 1 && s[0] == '0')
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return 1;
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if (count == 1 && s[0] == '1')
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return 2;
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if (count == 2 && s[0] == '-' && s[1] == '1')
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return 3;
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return -EINVAL;
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}
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/* generic stuff */
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static void entry_status(Node *e, char *page)
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{
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char *dp;
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char *status = "disabled";
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const char * flags = "flags: ";
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if (test_bit(Enabled, &e->flags))
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status = "enabled";
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if (!VERBOSE_STATUS) {
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sprintf(page, "%s\n", status);
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return;
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}
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sprintf(page, "%s\ninterpreter %s\n", status, e->interpreter);
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dp = page + strlen(page);
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/* print the special flags */
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sprintf (dp, "%s", flags);
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dp += strlen (flags);
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if (e->flags & MISC_FMT_PRESERVE_ARGV0) {
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*dp ++ = 'P';
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}
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if (e->flags & MISC_FMT_OPEN_BINARY) {
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*dp ++ = 'O';
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}
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if (e->flags & MISC_FMT_CREDENTIALS) {
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*dp ++ = 'C';
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}
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*dp ++ = '\n';
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|
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if (!test_bit(Magic, &e->flags)) {
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sprintf(dp, "extension .%s\n", e->magic);
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} else {
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int i;
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sprintf(dp, "offset %i\nmagic ", e->offset);
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dp = page + strlen(page);
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for (i = 0; i < e->size; i++) {
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sprintf(dp, "%02x", 0xff & (int) (e->magic[i]));
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dp += 2;
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}
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if (e->mask) {
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sprintf(dp, "\nmask ");
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dp += 6;
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for (i = 0; i < e->size; i++) {
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sprintf(dp, "%02x", 0xff & (int) (e->mask[i]));
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dp += 2;
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}
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}
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*dp++ = '\n';
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*dp = '\0';
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}
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}
|
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|
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static struct inode *bm_get_inode(struct super_block *sb, int mode)
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{
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struct inode * inode = new_inode(sb);
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|
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if (inode) {
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inode->i_mode = mode;
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inode->i_uid = 0;
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inode->i_gid = 0;
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inode->i_blocks = 0;
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inode->i_atime = inode->i_mtime = inode->i_ctime =
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current_fs_time(inode->i_sb);
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}
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return inode;
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}
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|
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static void bm_clear_inode(struct inode *inode)
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{
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kfree(inode->i_private);
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}
|
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|
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static void kill_node(Node *e)
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{
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struct dentry *dentry;
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|
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write_lock(&entries_lock);
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dentry = e->dentry;
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if (dentry) {
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list_del_init(&e->list);
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e->dentry = NULL;
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}
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write_unlock(&entries_lock);
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|
|
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if (dentry) {
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dentry->d_inode->i_nlink--;
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d_drop(dentry);
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dput(dentry);
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simple_release_fs(&bm_mnt, &entry_count);
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}
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}
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|
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/* /<entry> */
|
|
|
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static ssize_t
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bm_entry_read(struct file * file, char __user * buf, size_t nbytes, loff_t *ppos)
|
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{
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Node *e = file->f_path.dentry->d_inode->i_private;
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loff_t pos = *ppos;
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ssize_t res;
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char *page;
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int len;
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|
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if (!(page = (char*) __get_free_page(GFP_KERNEL)))
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return -ENOMEM;
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|
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entry_status(e, page);
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len = strlen(page);
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res = -EINVAL;
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if (pos < 0)
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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:
|
|
free_page((unsigned long) page);
|
|
return res;
|
|
}
|
|
|
|
static ssize_t bm_entry_write(struct file *file, const char __user *buffer,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct dentry *root;
|
|
Node *e = file->f_path.dentry->d_inode->i_private;
|
|
int res = parse_command(buffer, count);
|
|
|
|
switch (res) {
|
|
case 1: clear_bit(Enabled, &e->flags);
|
|
break;
|
|
case 2: set_bit(Enabled, &e->flags);
|
|
break;
|
|
case 3: root = dget(file->f_path.mnt->mnt_sb->s_root);
|
|
mutex_lock(&root->d_inode->i_mutex);
|
|
|
|
kill_node(e);
|
|
|
|
mutex_unlock(&root->d_inode->i_mutex);
|
|
dput(root);
|
|
break;
|
|
default: return res;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations bm_entry_operations = {
|
|
.read = bm_entry_read,
|
|
.write = bm_entry_write,
|
|
};
|
|
|
|
/* /register */
|
|
|
|
static ssize_t bm_register_write(struct file *file, const char __user *buffer,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
Node *e;
|
|
struct inode *inode;
|
|
struct dentry *root, *dentry;
|
|
struct super_block *sb = file->f_path.mnt->mnt_sb;
|
|
int err = 0;
|
|
|
|
e = create_entry(buffer, count);
|
|
|
|
if (IS_ERR(e))
|
|
return PTR_ERR(e);
|
|
|
|
root = dget(sb->s_root);
|
|
mutex_lock(&root->d_inode->i_mutex);
|
|
dentry = lookup_one_len(e->name, root, strlen(e->name));
|
|
err = PTR_ERR(dentry);
|
|
if (IS_ERR(dentry))
|
|
goto out;
|
|
|
|
err = -EEXIST;
|
|
if (dentry->d_inode)
|
|
goto out2;
|
|
|
|
inode = bm_get_inode(sb, S_IFREG | 0644);
|
|
|
|
err = -ENOMEM;
|
|
if (!inode)
|
|
goto out2;
|
|
|
|
err = simple_pin_fs(&bm_fs_type, &bm_mnt, &entry_count);
|
|
if (err) {
|
|
iput(inode);
|
|
inode = NULL;
|
|
goto out2;
|
|
}
|
|
|
|
e->dentry = dget(dentry);
|
|
inode->i_private = e;
|
|
inode->i_fop = &bm_entry_operations;
|
|
|
|
d_instantiate(dentry, inode);
|
|
write_lock(&entries_lock);
|
|
list_add(&e->list, &entries);
|
|
write_unlock(&entries_lock);
|
|
|
|
err = 0;
|
|
out2:
|
|
dput(dentry);
|
|
out:
|
|
mutex_unlock(&root->d_inode->i_mutex);
|
|
dput(root);
|
|
|
|
if (err) {
|
|
kfree(e);
|
|
return -EINVAL;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations bm_register_operations = {
|
|
.write = bm_register_write,
|
|
};
|
|
|
|
/* /status */
|
|
|
|
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;
|
|
|
|
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;
|
|
}
|
|
|
|
static ssize_t bm_status_write(struct file * file, const char __user * buffer,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
int res = parse_command(buffer, count);
|
|
struct dentry *root;
|
|
|
|
switch (res) {
|
|
case 1: enabled = 0; break;
|
|
case 2: enabled = 1; break;
|
|
case 3: root = dget(file->f_path.mnt->mnt_sb->s_root);
|
|
mutex_lock(&root->d_inode->i_mutex);
|
|
|
|
while (!list_empty(&entries))
|
|
kill_node(list_entry(entries.next, Node, list));
|
|
|
|
mutex_unlock(&root->d_inode->i_mutex);
|
|
dput(root);
|
|
default: return res;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
static const struct file_operations bm_status_operations = {
|
|
.read = bm_status_read,
|
|
.write = bm_status_write,
|
|
};
|
|
|
|
/* Superblock handling */
|
|
|
|
static const struct super_operations s_ops = {
|
|
.statfs = simple_statfs,
|
|
.clear_inode = bm_clear_inode,
|
|
};
|
|
|
|
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},
|
|
/* last one */ {""}
|
|
};
|
|
int err = simple_fill_super(sb, 0x42494e4d, bm_files);
|
|
if (!err)
|
|
sb->s_op = &s_ops;
|
|
return err;
|
|
}
|
|
|
|
static int bm_get_sb(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
|
|
{
|
|
return get_sb_single(fs_type, flags, data, bm_fill_super, mnt);
|
|
}
|
|
|
|
static struct linux_binfmt misc_format = {
|
|
.module = THIS_MODULE,
|
|
.load_binary = load_misc_binary,
|
|
};
|
|
|
|
static struct file_system_type bm_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "binfmt_misc",
|
|
.get_sb = bm_get_sb,
|
|
.kill_sb = kill_litter_super,
|
|
};
|
|
|
|
static int __init init_misc_binfmt(void)
|
|
{
|
|
int err = register_filesystem(&bm_fs_type);
|
|
if (!err) {
|
|
err = register_binfmt(&misc_format);
|
|
if (err)
|
|
unregister_filesystem(&bm_fs_type);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_misc_binfmt(void)
|
|
{
|
|
unregister_binfmt(&misc_format);
|
|
unregister_filesystem(&bm_fs_type);
|
|
}
|
|
|
|
core_initcall(init_misc_binfmt);
|
|
module_exit(exit_misc_binfmt);
|
|
MODULE_LICENSE("GPL");
|