1 #ifndef _LINUX_BINFMTS_H 2 #define _LINUX_BINFMTS_H 3 4 #include <linux/sched.h> 5 #include <linux/unistd.h> 6 #include <asm/exec.h> 7 #include <uapi/linux/binfmts.h> 8 9 struct filename; 10 11 #define CORENAME_MAX_SIZE 128 12 13 /* 14 * This structure is used to hold the arguments that are used when loading binaries. 15 */ 16 struct linux_binprm { 17 char buf[BINPRM_BUF_SIZE]; 18 #ifdef CONFIG_MMU 19 struct vm_area_struct *vma; 20 unsigned long vma_pages; 21 #else 22 # define MAX_ARG_PAGES 32 23 struct page *page[MAX_ARG_PAGES]; 24 #endif 25 struct mm_struct *mm; 26 unsigned long p; /* current top of mem */ 27 unsigned int 28 /* 29 * True after the bprm_set_creds hook has been called once 30 * (multiple calls can be made via prepare_binprm() for 31 * binfmt_script/misc). 32 */ 33 called_set_creds:1, 34 /* 35 * True if most recent call to the commoncaps bprm_set_creds 36 * hook (due to multiple prepare_binprm() calls from the 37 * binfmt_script/misc handlers) resulted in elevated 38 * privileges. 39 */ 40 cap_elevated:1, 41 /* 42 * Set by bprm_set_creds hook to indicate a privilege-gaining 43 * exec has happened. Used to sanitize execution environment 44 * and to set AT_SECURE auxv for glibc. 45 */ 46 secureexec:1; 47 #ifdef __alpha__ 48 unsigned int taso:1; 49 #endif 50 unsigned int recursion_depth; /* only for search_binary_handler() */ 51 struct file * file; 52 struct cred *cred; /* new credentials */ 53 int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */ 54 unsigned int per_clear; /* bits to clear in current->personality */ 55 int argc, envc; 56 const char * filename; /* Name of binary as seen by procps */ 57 const char * interp; /* Name of the binary really executed. Most 58 of the time same as filename, but could be 59 different for binfmt_{misc,script} */ 60 unsigned interp_flags; 61 unsigned interp_data; 62 unsigned long loader, exec; 63 } __randomize_layout; 64 65 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0 66 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT) 67 68 /* fd of the binary should be passed to the interpreter */ 69 #define BINPRM_FLAGS_EXECFD_BIT 1 70 #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT) 71 72 /* filename of the binary will be inaccessible after exec */ 73 #define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2 74 #define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT) 75 76 /* Function parameter for binfmt->coredump */ 77 struct coredump_params { 78 const siginfo_t *siginfo; 79 struct pt_regs *regs; 80 struct file *file; 81 unsigned long limit; 82 unsigned long mm_flags; 83 loff_t written; 84 loff_t pos; 85 }; 86 87 /* 88 * This structure defines the functions that are used to load the binary formats that 89 * linux accepts. 90 */ 91 struct linux_binfmt { 92 struct list_head lh; 93 struct module *module; 94 int (*load_binary)(struct linux_binprm *); 95 int (*load_shlib)(struct file *); 96 int (*core_dump)(struct coredump_params *cprm); 97 unsigned long min_coredump; /* minimal dump size */ 98 } __randomize_layout; 99 100 extern void __register_binfmt(struct linux_binfmt *fmt, int insert); 101 102 /* Registration of default binfmt handlers */ 103 static inline void register_binfmt(struct linux_binfmt *fmt) 104 { 105 __register_binfmt(fmt, 0); 106 } 107 /* Same as above, but adds a new binfmt at the top of the list */ 108 static inline void insert_binfmt(struct linux_binfmt *fmt) 109 { 110 __register_binfmt(fmt, 1); 111 } 112 113 extern void unregister_binfmt(struct linux_binfmt *); 114 115 extern int prepare_binprm(struct linux_binprm *); 116 extern int __must_check remove_arg_zero(struct linux_binprm *); 117 extern int search_binary_handler(struct linux_binprm *); 118 extern int flush_old_exec(struct linux_binprm * bprm); 119 extern void setup_new_exec(struct linux_binprm * bprm); 120 extern void would_dump(struct linux_binprm *, struct file *); 121 122 extern int suid_dumpable; 123 124 /* Stack area protections */ 125 #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */ 126 #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */ 127 #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */ 128 129 extern int setup_arg_pages(struct linux_binprm * bprm, 130 unsigned long stack_top, 131 int executable_stack); 132 extern int transfer_args_to_stack(struct linux_binprm *bprm, 133 unsigned long *sp_location); 134 extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm); 135 extern int copy_strings_kernel(int argc, const char *const *argv, 136 struct linux_binprm *bprm); 137 extern int prepare_bprm_creds(struct linux_binprm *bprm); 138 extern void install_exec_creds(struct linux_binprm *bprm); 139 extern void set_binfmt(struct linux_binfmt *new); 140 extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t); 141 142 extern int do_execve(struct filename *, 143 const char __user * const __user *, 144 const char __user * const __user *); 145 extern int do_execveat(int, struct filename *, 146 const char __user * const __user *, 147 const char __user * const __user *, 148 int); 149 150 #endif /* _LINUX_BINFMTS_H */ 151