1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_BINFMTS_H 3 #define _LINUX_BINFMTS_H 4 5 #include <linux/sched.h> 6 #include <linux/unistd.h> 7 #include <asm/exec.h> 8 #include <uapi/linux/binfmts.h> 9 10 struct filename; 11 12 #define CORENAME_MAX_SIZE 128 13 14 /* 15 * This structure is used to hold the arguments that are used when loading binaries. 16 */ 17 struct linux_binprm { 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 long argmin; /* rlimit marker for copy_strings() */ 28 unsigned int 29 /* Should an execfd be passed to userspace? */ 30 have_execfd:1, 31 32 /* Use the creds of a script (see binfmt_misc) */ 33 execfd_creds:1, 34 /* 35 * Set by bprm_creds_for_exec hook to indicate a 36 * privilege-gaining exec has happened. Used to set 37 * AT_SECURE auxv for glibc. 38 */ 39 secureexec:1, 40 /* 41 * Set when errors can no longer be returned to the 42 * original userspace. 43 */ 44 point_of_no_return:1; 45 #ifdef __alpha__ 46 unsigned int taso:1; 47 #endif 48 struct file * executable; /* Executable to pass to the interpreter */ 49 struct file * interpreter; 50 struct file * file; 51 struct cred *cred; /* new credentials */ 52 int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */ 53 unsigned int per_clear; /* bits to clear in current->personality */ 54 int argc, envc; 55 const char * filename; /* Name of binary as seen by procps */ 56 const char * interp; /* Name of the binary really executed. Most 57 of the time same as filename, but could be 58 different for binfmt_{misc,script} */ 59 unsigned interp_flags; 60 int execfd; /* File descriptor of the executable */ 61 unsigned long loader, exec; 62 63 struct rlimit rlim_stack; /* Saved RLIMIT_STACK used during exec. */ 64 65 char buf[BINPRM_BUF_SIZE]; 66 } __randomize_layout; 67 68 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0 69 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT) 70 71 /* filename of the binary will be inaccessible after exec */ 72 #define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2 73 #define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT) 74 75 /* Function parameter for binfmt->coredump */ 76 struct coredump_params { 77 const kernel_siginfo_t *siginfo; 78 struct pt_regs *regs; 79 struct file *file; 80 unsigned long limit; 81 unsigned long mm_flags; 82 loff_t written; 83 loff_t pos; 84 }; 85 86 /* 87 * This structure defines the functions that are used to load the binary formats that 88 * linux accepts. 89 */ 90 struct linux_binfmt { 91 struct list_head lh; 92 struct module *module; 93 int (*load_binary)(struct linux_binprm *); 94 int (*load_shlib)(struct file *); 95 int (*core_dump)(struct coredump_params *cprm); 96 unsigned long min_coredump; /* minimal dump size */ 97 } __randomize_layout; 98 99 extern void __register_binfmt(struct linux_binfmt *fmt, int insert); 100 101 /* Registration of default binfmt handlers */ 102 static inline void register_binfmt(struct linux_binfmt *fmt) 103 { 104 __register_binfmt(fmt, 0); 105 } 106 /* Same as above, but adds a new binfmt at the top of the list */ 107 static inline void insert_binfmt(struct linux_binfmt *fmt) 108 { 109 __register_binfmt(fmt, 1); 110 } 111 112 extern void unregister_binfmt(struct linux_binfmt *); 113 114 extern int __must_check remove_arg_zero(struct linux_binprm *); 115 extern int begin_new_exec(struct linux_binprm * bprm); 116 extern void setup_new_exec(struct linux_binprm * bprm); 117 extern void finalize_exec(struct linux_binprm *bprm); 118 extern void would_dump(struct linux_binprm *, struct file *); 119 120 extern int suid_dumpable; 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 transfer_args_to_stack(struct linux_binprm *bprm, 131 unsigned long *sp_location); 132 extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm); 133 int copy_string_kernel(const char *arg, struct linux_binprm *bprm); 134 extern void set_binfmt(struct linux_binfmt *new); 135 extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t); 136 137 extern int do_execve(struct filename *, 138 const char __user * const __user *, 139 const char __user * const __user *); 140 extern int do_execveat(int, struct filename *, 141 const char __user * const __user *, 142 const char __user * const __user *, 143 int); 144 145 #endif /* _LINUX_BINFMTS_H */ 146