linux-imx

/*

 * binfmt_misc.c

 *

 * Copyright (C) 1997 Richard Günther

 *

 * binfmt_misc detects binaries via a magic or filename extension and invokes

 * a specified wrapper. See Documentation/admin-guide/binfmt-misc.rst for more details.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/sched/mm.h>

#include <linux/magic.h>

#include <linux/binfmts.h>

#include <linux/slab.h>

#include <linux/ctype.h>

#include <linux/string_helpers.h>

#include <linux/file.h>

#include <linux/pagemap.h>

#include <linux/namei.h>

#include <linux/mount.h>

#include <linux/syscalls.h>

#include <linux/fs.h>

#include <linux/uaccess.h>

​

#include "internal.h"

​

#ifdef DEBUG

# define USE_DEBUG 1

#else

# define USE_DEBUG 0

#endif

​

enum {

    VERBOSE_STATUS = 1 /* make it zero to save 400 bytes kernel memory */

};

​

static LIST_HEAD(entries);

static int enabled = 1;

​

enum {Enabled, Magic};

#define MISC_FMT_PRESERVE_ARGV0 (1 << 31)

#define MISC_FMT_OPEN_BINARY (1 << 30)

#define MISC_FMT_CREDENTIALS (1 << 29)

#define MISC_FMT_OPEN_FILE (1 << 28)

​

typedef struct {

    struct list_head list;

    unsigned long flags;        /* type, status, etc. */

    int offset;         /* offset of magic */

    int size;           /* size of magic/mask */

    char *magic;            /* magic or filename extension */

    char *mask;         /* mask, NULL for exact match */

    const char *interpreter;    /* filename of interpreter */

    char *name;

    struct dentry *dentry;

    struct file *interp_file;

} Node;

​

static DEFINE_RWLOCK(entries_lock);