1 #ifndef _LINUX_BINFMTS_H 2 #define _LINUX_BINFMTS_H 3 4 #include <linux/capability.h> 5 6 struct pt_regs; 7 8 /* 9 * These are the maximum length and maximum number of strings passed to the 10 * execve() system call. MAX_ARG_STRLEN is essentially random but serves to 11 * prevent the kernel from being unduly impacted by misaddressed pointers. 12 * MAX_ARG_STRINGS is chosen to fit in a signed 32-bit integer. 13 */ 14 #define MAX_ARG_STRLEN (PAGE_SIZE * 32) 15 #define MAX_ARG_STRINGS 0x7FFFFFFF 16 17 /* sizeof(linux_binprm->buf) */ 18 #define BINPRM_BUF_SIZE 128 19 20 #ifdef __KERNEL__ 21 22 #define CORENAME_MAX_SIZE 128 23 24 /* 25 * This structure is used to hold the arguments that are used when loading binaries. 26 */ 27 struct linux_binprm{ 28 char buf[BINPRM_BUF_SIZE]; 29 #ifdef CONFIG_MMU 30 struct vm_area_struct *vma; 31 #else 32 # define MAX_ARG_PAGES 32 33 struct page *page[MAX_ARG_PAGES]; 34 #endif 35 struct mm_struct *mm; 36 unsigned long p; /* current top of mem */ 37 int sh_bang; 38 struct file * file; 39 int e_uid, e_gid; 40 kernel_cap_t cap_inheritable, cap_permitted; 41 bool cap_effective; 42 void *security; 43 int argc, envc; 44 char * filename; /* Name of binary as seen by procps */ 45 char * interp; /* Name of the binary really executed. Most 46 of the time same as filename, but could be 47 different for binfmt_{misc,script} */ 48 unsigned interp_flags; 49 unsigned interp_data; 50 unsigned long loader, exec; 51 unsigned long argv_len; 52 }; 53 54 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0 55 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT) 56 57 /* fd of the binary should be passed to the interpreter */ 58 #define BINPRM_FLAGS_EXECFD_BIT 1 59 #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT) 60 61 62 /* 63 * This structure defines the functions that are used to load the binary formats that 64 * linux accepts. 65 */ 66 struct linux_binfmt { 67 struct list_head lh; 68 struct module *module; 69 int (*load_binary)(struct linux_binprm *, struct pt_regs * regs); 70 int (*load_shlib)(struct file *); 71 int (*core_dump)(long signr, struct pt_regs *regs, struct file *file, unsigned long limit); 72 unsigned long min_coredump; /* minimal dump size */ 73 int hasvdso; 74 }; 75 76 extern int register_binfmt(struct linux_binfmt *); 77 extern void unregister_binfmt(struct linux_binfmt *); 78 79 extern int prepare_binprm(struct linux_binprm *); 80 extern int __must_check remove_arg_zero(struct linux_binprm *); 81 extern int search_binary_handler(struct linux_binprm *,struct pt_regs *); 82 extern int flush_old_exec(struct linux_binprm * bprm); 83 84 extern int suid_dumpable; 85 #define SUID_DUMP_DISABLE 0 /* No setuid dumping */ 86 #define SUID_DUMP_USER 1 /* Dump as user of process */ 87 #define SUID_DUMP_ROOT 2 /* Dump as root */ 88 89 /* Stack area protections */ 90 #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */ 91 #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */ 92 #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */ 93 94 extern int setup_arg_pages(struct linux_binprm * bprm, 95 unsigned long stack_top, 96 int executable_stack); 97 extern int bprm_mm_init(struct linux_binprm *bprm); 98 extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm); 99 extern void compute_creds(struct linux_binprm *binprm); 100 extern int do_coredump(long signr, int exit_code, struct pt_regs * regs); 101 extern int set_binfmt(struct linux_binfmt *new); 102 103 #endif /* __KERNEL__ */ 104 #endif /* _LINUX_BINFMTS_H */ 105