diff options
Diffstat (limited to 'include/linux/binfmts.h')
| -rw-r--r-- | include/linux/binfmts.h | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h new file mode 100644 index 00000000..366422bc --- /dev/null +++ b/include/linux/binfmts.h @@ -0,0 +1,140 @@ +#ifndef _LINUX_BINFMTS_H +#define _LINUX_BINFMTS_H + +#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. + */ +#define MAX_ARG_STRLEN (PAGE_SIZE * 32) +#define MAX_ARG_STRINGS 0x7FFFFFFF + +/* sizeof(linux_binprm->buf) */ +#define BINPRM_BUF_SIZE 128 + +#ifdef __KERNEL__ +#include <linux/sched.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; + 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]; +}; + +#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) + +#define BINPRM_MAX_RECURSION 4 + +/* 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 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 *, 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 */ |