root/include/linux/binfmts.h

INCLUDED FROM

DEFINITIONS

1. register_binfmt
2. insert_binfmt

#ifndef _LINUX_BINFMTS_H
#define _LINUX_BINFMTS_H

#include <linux/sched.h>
#include <linux/unistd.h>
#include <asm/exec.h>
#include <uapi/linux/binfmts.h>

#define CORENAME_MAX_SIZE 128

/*
 * This structure is used to hold the arguments that are used when loading binaries.
 */
struct linux_binprm {
        char buf[BINPRM_BUF_SIZE];
#ifdef CONFIG_MMU
        struct vm_area_struct *vma;
        unsigned long vma_pages;
#else
# define MAX_ARG_PAGES  32
        struct page *page[MAX_ARG_PAGES];
#endif
        struct mm_struct *mm;
        unsigned long p; /* current top of mem */
        unsigned int
                cred_prepared:1,/* true if creds already prepared (multiple
                                 * preps happen for interpreters) */
                cap_effective:1;/* true if has elevated effective capabilities,
                                 * false if not; except for init which inherits
                                 * its parent's caps anyway */
#ifdef __alpha__
        unsigned int taso:1;
#endif
        unsigned int recursion_depth; /* only for search_binary_handler() */
        struct file * file;
        struct cred *cred;      /* new credentials */
        int unsafe;             /* how unsafe this exec is (mask of LSM_UNSAFE_*) */
        unsigned int per_clear; /* bits to clear in current->personality */
        int argc, envc;
        const char * filename;  /* Name of binary as seen by procps */
        const char * interp;    /* Name of the binary really executed. Most
                                   of the time same as filename, but could be
                                   different for binfmt_{misc,script} */
        unsigned interp_flags;
        unsigned interp_data;
        unsigned long loader, exec;
};

#define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
#define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)

/* fd of the binary should be passed to the interpreter */
#define BINPRM_FLAGS_EXECFD_BIT 1
#define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)

/* Function parameter for binfmt->coredump */
struct coredump_params {
        const siginfo_t *siginfo;
        struct pt_regs *regs;
        struct file *file;
        unsigned long limit;
        unsigned long mm_flags;
        loff_t written;
};

/*
 * This structure defines the functions that are used to load the binary formats that
 * linux accepts.
 */
struct linux_binfmt {
        struct list_head lh;
        struct module *module;
        int (*load_binary)(struct linux_binprm *);
        int (*load_shlib)(struct file *);
        int (*core_dump)(struct coredump_params *cprm);
        unsigned long min_coredump;     /* minimal dump size */
};

extern void __register_binfmt(struct linux_binfmt *fmt, int insert);

/* Registration of default binfmt handlers */
static inline void register_binfmt(struct linux_binfmt *fmt)
{
        __register_binfmt(fmt, 0);
}
/* Same as above, but adds a new binfmt at the top of the list */
static inline void insert_binfmt(struct linux_binfmt *fmt)
{
        __register_binfmt(fmt, 1);
}

extern void unregister_binfmt(struct linux_binfmt *);

extern int prepare_binprm(struct linux_binprm *);
extern int __must_check remove_arg_zero(struct linux_binprm *);
extern int search_binary_handler(struct linux_binprm *);
extern int flush_old_exec(struct linux_binprm * bprm);
extern void setup_new_exec(struct linux_binprm * bprm);
extern void would_dump(struct linux_binprm *, struct file *);

extern int suid_dumpable;

/* Stack area protections */
#define EXSTACK_DEFAULT   0     /* Whatever the arch defaults to */
#define EXSTACK_DISABLE_X 1     /* Disable executable stacks */
#define EXSTACK_ENABLE_X  2     /* Enable executable stacks */

extern int setup_arg_pages(struct linux_binprm * bprm,
                           unsigned long stack_top,
                           int executable_stack);
extern int bprm_change_interp(char *interp, struct linux_binprm *bprm);
extern int copy_strings_kernel(int argc, const char *const *argv,
                               struct linux_binprm *bprm);
extern int prepare_bprm_creds(struct linux_binprm *bprm);
extern void install_exec_creds(struct linux_binprm *bprm);
extern void set_binfmt(struct linux_binfmt *new);
extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t);

#endif /* _LINUX_BINFMTS_H */