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/sched.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 unsigned long vma_pages; 33 #else 34 # define MAX_ARG_PAGES 32 35 struct page *page[MAX_ARG_PAGES]; 36 #endif 37 struct mm_struct *mm; 38 unsigned long p; /* current top of mem */ 39 unsigned int 40 cred_prepared:1,/* true if creds already prepared (multiple 41 * preps happen for interpreters) */ 42 cap_effective:1;/* true if has elevated effective capabilities, 43 * false if not; except for init which inherits 44 * its parent's caps anyway */ 45 #ifdef __alpha__ 46 unsigned int taso:1; 47 #endif 48 unsigned int recursion_depth; 49 struct file * file; 50 struct cred *cred; /* new credentials */ 51 int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */ 52 unsigned int per_clear; /* bits to clear in current->personality */ 53 int argc, envc; 54 const char * filename; /* Name of binary as seen by procps */ 55 const char * interp; /* Name of the binary really executed. Most 56 of the time same as filename, but could be 57 different for binfmt_{misc,script} */ 58 unsigned interp_flags; 59 unsigned interp_data; 60 unsigned long loader, exec; 61 char tcomm[TASK_COMM_LEN]; 62 }; 63 64 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0 65 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT) 66 67 /* fd of the binary should be passed to the interpreter */ 68 #define BINPRM_FLAGS_EXECFD_BIT 1 69 #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT) 70 71 #define BINPRM_MAX_RECURSION 4 72 73 /* Function parameter for binfmt->coredump */ 74 struct coredump_params { 75 long signr; 76 struct pt_regs *regs; 77 struct file *file; 78 unsigned long limit; 79 unsigned long mm_flags; 80 }; 81 82 /* 83 * This structure defines the functions that are used to load the binary formats that 84 * linux accepts. 85 */ 86 struct linux_binfmt { 87 struct list_head lh; 88 struct module *module; 89 int (*load_binary)(struct linux_binprm *, struct pt_regs * regs); 90 int (*load_shlib)(struct file *); 91 int (*core_dump)(struct coredump_params *cprm); 92 unsigned long min_coredump; /* minimal dump size */ 93 }; 94 95 extern void __register_binfmt(struct linux_binfmt *fmt, int insert); 96 97 /* Registration of default binfmt handlers */ 98 static inline void register_binfmt(struct linux_binfmt *fmt) 99 { 100 __register_binfmt(fmt, 0); 101 } 102 /* Same as above, but adds a new binfmt at the top of the list */ 103 static inline void insert_binfmt(struct linux_binfmt *fmt) 104 { 105 __register_binfmt(fmt, 1); 106 } 107 108 extern void unregister_binfmt(struct linux_binfmt *); 109 110 extern int prepare_binprm(struct linux_binprm *); 111 extern int __must_check remove_arg_zero(struct linux_binprm *); 112 extern int search_binary_handler(struct linux_binprm *, struct pt_regs *); 113 extern int flush_old_exec(struct linux_binprm * bprm); 114 extern void setup_new_exec(struct linux_binprm * bprm); 115 extern void would_dump(struct linux_binprm *, struct file *); 116 117 extern int suid_dumpable; 118 #define SUID_DUMP_DISABLE 0 /* No setuid dumping */ 119 #define SUID_DUMP_USER 1 /* Dump as user of process */ 120 #define SUID_DUMP_ROOT 2 /* Dump as root */ 121 122 /* Stack area protections */ 123 #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */ 124 #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */ 125 #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */ 126 127 extern int setup_arg_pages(struct linux_binprm * bprm, 128 unsigned long stack_top, 129 int executable_stack); 130 extern int bprm_mm_init(struct linux_binprm *bprm); 131 extern int copy_strings_kernel(int argc, const char *const *argv, 132 struct linux_binprm *bprm); 133 extern int prepare_bprm_creds(struct linux_binprm *bprm); 134 extern void install_exec_creds(struct linux_binprm *bprm); 135 extern void do_coredump(long signr, int exit_code, struct pt_regs *regs); 136 extern void set_binfmt(struct linux_binfmt *new); 137 extern void free_bprm(struct linux_binprm *); 138 139 #endif /* __KERNEL__ */ 140 #endif /* _LINUX_BINFMTS_H */ 141