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 /* It is safe to use the creds of a script (see binfmt_misc) */ 33 preserve_creds:1, 34 /* 35 * True if most recent call to security_bprm_set_creds 36 * resulted in elevated privileges. 37 */ 38 active_secureexec:1, 39 /* 40 * Set by bprm_creds_for_exec hook to indicate a 41 * privilege-gaining exec has happened. Used to set 42 * AT_SECURE auxv for glibc. 43 */ 44 secureexec:1, 45 /* 46 * Set when errors can no longer be returned to the 47 * original userspace. 48 */ 49 point_of_no_return:1; 50 #ifdef __alpha__ 51 unsigned int taso:1; 52 #endif 53 struct file * executable; /* Executable to pass to the interpreter */ 54 struct file * interpreter; 55 struct file * file; 56 struct cred *cred; /* new credentials */ 57 int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */ 58 unsigned int per_clear; /* bits to clear in current->personality */ 59 int argc, envc; 60 const char * filename; /* Name of binary as seen by procps */ 61 const char * interp; /* Name of the binary really executed. Most 62 of the time same as filename, but could be 63 different for binfmt_{misc,script} */ 64 unsigned interp_flags; 65 int execfd; /* File descriptor of the executable */ 66 unsigned long loader, exec; 67 68 struct rlimit rlim_stack; /* Saved RLIMIT_STACK used during exec. */ 69 70 char buf[BINPRM_BUF_SIZE]; 71 } __randomize_layout; 72 73 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0 74 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT) 75 76 /* filename of the binary will be inaccessible after exec */ 77 #define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2 78 #define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT) 79 80 /* Function parameter for binfmt->coredump */ 81 struct coredump_params { 82 const kernel_siginfo_t *siginfo; 83 struct pt_regs *regs; 84 struct file *file; 85 unsigned long limit; 86 unsigned long mm_flags; 87 loff_t written; 88 loff_t pos; 89 }; 90 91 /* 92 * This structure defines the functions that are used to load the binary formats that 93 * linux accepts. 94 */ 95 struct linux_binfmt { 96 struct list_head lh; 97 struct module *module; 98 int (*load_binary)(struct linux_binprm *); 99 int (*load_shlib)(struct file *); 100 int (*core_dump)(struct coredump_params *cprm); 101 unsigned long min_coredump; /* minimal dump size */ 102 } __randomize_layout; 103 104 extern void __register_binfmt(struct linux_binfmt *fmt, int insert); 105 106 /* Registration of default binfmt handlers */ 107 static inline void register_binfmt(struct linux_binfmt *fmt) 108 { 109 __register_binfmt(fmt, 0); 110 } 111 /* Same as above, but adds a new binfmt at the top of the list */ 112 static inline void insert_binfmt(struct linux_binfmt *fmt) 113 { 114 __register_binfmt(fmt, 1); 115 } 116 117 extern void unregister_binfmt(struct linux_binfmt *); 118 119 extern int __must_check remove_arg_zero(struct linux_binprm *); 120 extern int begin_new_exec(struct linux_binprm * bprm); 121 extern void setup_new_exec(struct linux_binprm * bprm); 122 extern void finalize_exec(struct linux_binprm *bprm); 123 extern void would_dump(struct linux_binprm *, struct file *); 124 125 extern int suid_dumpable; 126 127 /* Stack area protections */ 128 #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */ 129 #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */ 130 #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */ 131 132 extern int setup_arg_pages(struct linux_binprm * bprm, 133 unsigned long stack_top, 134 int executable_stack); 135 extern int transfer_args_to_stack(struct linux_binprm *bprm, 136 unsigned long *sp_location); 137 extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm); 138 extern int copy_strings_kernel(int argc, const char *const *argv, 139 struct linux_binprm *bprm); 140 extern void set_binfmt(struct linux_binfmt *new); 141 extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t); 142 143 extern int do_execve(struct filename *, 144 const char __user * const __user *, 145 const char __user * const __user *); 146 extern int do_execveat(int, struct filename *, 147 const char __user * const __user *, 148 const char __user * const __user *, 149 int); 150 int do_execve_file(struct file *file, void *__argv, void *__envp); 151 152 #endif /* _LINUX_BINFMTS_H */ 153