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 #include <linux/list.h> 22 23 #define CORENAME_MAX_SIZE 128 24 25 /* 26 * This structure is used to hold the arguments that are used when loading binaries. 27 */ 28 struct linux_binprm{ 29 char buf[BINPRM_BUF_SIZE]; 30 #ifdef CONFIG_MMU 31 struct vm_area_struct *vma; 32 #else 33 # define MAX_ARG_PAGES 32 34 struct page *page[MAX_ARG_PAGES]; 35 #endif 36 struct mm_struct *mm; 37 unsigned long p; /* current top of mem */ 38 unsigned int 39 cred_prepared:1,/* true if creds already prepared (multiple 40 * preps happen for interpreters) */ 41 cap_effective:1;/* true if has elevated effective capabilities, 42 * false if not; except for init which inherits 43 * its parent's caps anyway */ 44 #ifdef __alpha__ 45 unsigned int taso:1; 46 #endif 47 unsigned int recursion_depth; 48 struct file * file; 49 struct cred *cred; /* new credentials */ 50 int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */ 51 unsigned int per_clear; /* bits to clear in current->personality */ 52 int argc, envc; 53 char * filename; /* Name of binary as seen by procps */ 54 char * interp; /* Name of the binary really executed. Most 55 of the time same as filename, but could be 56 different for binfmt_{misc,script} */ 57 unsigned interp_flags; 58 unsigned interp_data; 59 unsigned long loader, exec; 60 }; 61 62 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0 63 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT) 64 65 /* fd of the binary should be passed to the interpreter */ 66 #define BINPRM_FLAGS_EXECFD_BIT 1 67 #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT) 68 69 #define BINPRM_MAX_RECURSION 4 70 71 /* Function parameter for binfmt->coredump */ 72 struct coredump_params { 73 long signr; 74 struct pt_regs *regs; 75 struct file *file; 76 unsigned long limit; 77 }; 78 79 /* 80 * This structure defines the functions that are used to load the binary formats that 81 * linux accepts. 82 */ 83 struct linux_binfmt { 84 struct list_head lh; 85 struct module *module; 86 int (*load_binary)(struct linux_binprm *, struct pt_regs * regs); 87 int (*load_shlib)(struct file *); 88 int (*core_dump)(struct coredump_params *cprm); 89 unsigned long min_coredump; /* minimal dump size */ 90 int hasvdso; 91 }; 92 93 extern int __register_binfmt(struct linux_binfmt *fmt, int insert); 94 95 /* Registration of default binfmt handlers */ 96 static inline int register_binfmt(struct linux_binfmt *fmt) 97 { 98 return __register_binfmt(fmt, 0); 99 } 100 /* Same as above, but adds a new binfmt at the top of the list */ 101 static inline int insert_binfmt(struct linux_binfmt *fmt) 102 { 103 return __register_binfmt(fmt, 1); 104 } 105 106 extern void unregister_binfmt(struct linux_binfmt *); 107 108 extern int prepare_binprm(struct linux_binprm *); 109 extern int __must_check remove_arg_zero(struct linux_binprm *); 110 extern int search_binary_handler(struct linux_binprm *,struct pt_regs *); 111 extern int flush_old_exec(struct linux_binprm * bprm); 112 113 extern int suid_dumpable; 114 #define SUID_DUMP_DISABLE 0 /* No setuid dumping */ 115 #define SUID_DUMP_USER 1 /* Dump as user of process */ 116 #define SUID_DUMP_ROOT 2 /* Dump as root */ 117 118 /* Stack area protections */ 119 #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */ 120 #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */ 121 #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */ 122 123 extern int setup_arg_pages(struct linux_binprm * bprm, 124 unsigned long stack_top, 125 int executable_stack); 126 extern int bprm_mm_init(struct linux_binprm *bprm); 127 extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm); 128 extern int prepare_bprm_creds(struct linux_binprm *bprm); 129 extern void install_exec_creds(struct linux_binprm *bprm); 130 extern void do_coredump(long signr, int exit_code, struct pt_regs *regs); 131 extern void set_binfmt(struct linux_binfmt *new); 132 extern void free_bprm(struct linux_binprm *); 133 134 #endif /* __KERNEL__ */ 135 #endif /* _LINUX_BINFMTS_H */ 136