Kernel  |  3.3

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#include <linux/capability.h>

struct pt_regs;

 * These are the maximum length and maximum number of strings passed to the
 * execve() system call.  MAX_ARG_STRLEN is essentially random but serves to
 * prevent the kernel from being unduly impacted by misaddressed pointers.
 * MAX_ARG_STRINGS is chosen to fit in a signed 32-bit integer.

/* sizeof(linux_binprm->buf) */
#define BINPRM_BUF_SIZE 128

#ifdef __KERNEL__
#include <linux/sched.h>


 * This structure is used to hold the arguments that are used when loading binaries.
struct linux_binprm {
	char buf[BINPRM_BUF_SIZE];
	struct vm_area_struct *vma;
	unsigned long vma_pages;
# define MAX_ARG_PAGES	32
	struct page *page[MAX_ARG_PAGES];
	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;
	unsigned int recursion_depth;
	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;
	char tcomm[TASK_COMM_LEN];


/* fd of the binary should be passed to the interpreter */


/* Function parameter for binfmt->coredump */
struct coredump_params {
	long signr;
	struct pt_regs *regs;
	struct file *file;
	unsigned long limit;
	unsigned long mm_flags;

 * 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 *, struct  pt_regs * regs);
	int (*load_shlib)(struct file *);
	int (*core_dump)(struct coredump_params *cprm);
	unsigned long min_coredump;	/* minimal dump size */

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

/* Registration of default binfmt handlers */
static inline int register_binfmt(struct linux_binfmt *fmt)
	return __register_binfmt(fmt, 0);
/* Same as above, but adds a new binfmt at the top of the list */
static inline int insert_binfmt(struct linux_binfmt *fmt)
	return __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 *, struct pt_regs *);
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;
#define SUID_DUMP_DISABLE	0	/* No setuid dumping */
#define SUID_DUMP_USER		1	/* Dump as user of process */
#define SUID_DUMP_ROOT		2	/* Dump as root */

/* 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_mm_init(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 do_coredump(long signr, int exit_code, struct pt_regs *regs);
extern void set_binfmt(struct linux_binfmt *new);
extern void free_bprm(struct linux_binprm *);

#endif /* __KERNEL__ */
#endif /* _LINUX_BINFMTS_H */