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 unsigned int sh_bang:1, 38 misc_bang:1; 39 #ifdef __alpha__ 40 unsigned int taso:1; 41 #endif 42 unsigned int recursion_depth; 43 struct file * file; 44 int e_uid, e_gid; 45 kernel_cap_t cap_post_exec_permitted; 46 bool cap_effective; 47 void *security; 48 int argc, envc; 49 char * filename; /* Name of binary as seen by procps */ 50 char * interp; /* Name of the binary really executed. Most 51 of the time same as filename, but could be 52 different for binfmt_{misc,script} */ 53 unsigned interp_flags; 54 unsigned interp_data; 55 unsigned long loader, exec; 56 }; 57 58 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0 59 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT) 60 61 /* fd of the binary should be passed to the interpreter */ 62 #define BINPRM_FLAGS_EXECFD_BIT 1 63 #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT) 64 65 #define BINPRM_MAX_RECURSION 4 66 67 /* 68 * This structure defines the functions that are used to load the binary formats that 69 * linux accepts. 70 */ 71 struct linux_binfmt { 72 struct list_head lh; 73 struct module *module; 74 int (*load_binary)(struct linux_binprm *, struct pt_regs * regs); 75 int (*load_shlib)(struct file *); 76 int (*core_dump)(long signr, struct pt_regs *regs, struct file *file, unsigned long limit); 77 unsigned long min_coredump; /* minimal dump size */ 78 int hasvdso; 79 }; 80 81 extern int register_binfmt(struct linux_binfmt *); 82 extern void unregister_binfmt(struct linux_binfmt *); 83 84 extern int prepare_binprm(struct linux_binprm *); 85 extern int __must_check remove_arg_zero(struct linux_binprm *); 86 extern int search_binary_handler(struct linux_binprm *,struct pt_regs *); 87 extern int flush_old_exec(struct linux_binprm * bprm); 88 89 extern int suid_dumpable; 90 #define SUID_DUMP_DISABLE 0 /* No setuid dumping */ 91 #define SUID_DUMP_USER 1 /* Dump as user of process */ 92 #define SUID_DUMP_ROOT 2 /* Dump as root */ 93 94 /* Stack area protections */ 95 #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */ 96 #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */ 97 #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */ 98 99 extern int setup_arg_pages(struct linux_binprm * bprm, 100 unsigned long stack_top, 101 int executable_stack); 102 extern int bprm_mm_init(struct linux_binprm *bprm); 103 extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm); 104 extern void compute_creds(struct linux_binprm *binprm); 105 extern int do_coredump(long signr, int exit_code, struct pt_regs * regs); 106 extern int set_binfmt(struct linux_binfmt *new); 107 extern void free_bprm(struct linux_binprm *); 108 109 #endif /* __KERNEL__ */ 110 #endif /* _LINUX_BINFMTS_H */ 111