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 /* 30 * True after the bprm_set_creds hook has been called once 31 * (multiple calls can be made via prepare_binprm() for 32 * binfmt_script/misc). 33 */ 34 called_set_creds:1, 35 /* 36 * True if most recent call to the commoncaps bprm_set_creds 37 * hook (due to multiple prepare_binprm() calls from the 38 * binfmt_script/misc handlers) resulted in elevated 39 * privileges. 40 */ 41 cap_elevated:1, 42 /* 43 * Set by bprm_set_creds hook to indicate a privilege-gaining 44 * exec has happened. Used to sanitize execution environment 45 * and to set AT_SECURE auxv for glibc. 46 */ 47 secureexec:1, 48 /* 49 * Set when errors can no longer be returned to the 50 * original userspace. 51 */ 52 point_of_no_return:1; 53 #ifdef __alpha__ 54 unsigned int taso:1; 55 #endif 56 unsigned int recursion_depth; /* only for search_binary_handler() */ 57 struct file * file; 58 struct cred *cred; /* new credentials */ 59 int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */ 60 unsigned int per_clear; /* bits to clear in current->personality */ 61 int argc, envc; 62 const char * filename; /* Name of binary as seen by procps */ 63 const char * interp; /* Name of the binary really executed. Most 64 of the time same as filename, but could be 65 different for binfmt_{misc,script} */ 66 unsigned interp_flags; 67 unsigned interp_data; 68 unsigned long loader, exec; 69 70 struct rlimit rlim_stack; /* Saved RLIMIT_STACK used during exec. */ 71 72 char buf[BINPRM_BUF_SIZE]; 73 } __randomize_layout; 74 75 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0 76 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT) 77 78 /* fd of the binary should be passed to the interpreter */ 79 #define BINPRM_FLAGS_EXECFD_BIT 1 80 #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT) 81 82 /* filename of the binary will be inaccessible after exec */ 83 #define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2 84 #define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT) 85 86 /* Function parameter for binfmt->coredump */ 87 struct coredump_params { 88 const kernel_siginfo_t *siginfo; 89 struct pt_regs *regs; 90 struct file *file; 91 unsigned long limit; 92 unsigned long mm_flags; 93 loff_t written; 94 loff_t pos; 95 }; 96 97 /* 98 * This structure defines the functions that are used to load the binary formats that 99 * linux accepts. 100 */ 101 struct linux_binfmt { 102 struct list_head lh; 103 struct module *module; 104 int (*load_binary)(struct linux_binprm *); 105 int (*load_shlib)(struct file *); 106 int (*core_dump)(struct coredump_params *cprm); 107 unsigned long min_coredump; /* minimal dump size */ 108 } __randomize_layout; 109 110 extern void __register_binfmt(struct linux_binfmt *fmt, int insert); 111 112 /* Registration of default binfmt handlers */ 113 static inline void register_binfmt(struct linux_binfmt *fmt) 114 { 115 __register_binfmt(fmt, 0); 116 } 117 /* Same as above, but adds a new binfmt at the top of the list */ 118 static inline void insert_binfmt(struct linux_binfmt *fmt) 119 { 120 __register_binfmt(fmt, 1); 121 } 122 123 extern void unregister_binfmt(struct linux_binfmt *); 124 125 extern int prepare_binprm(struct linux_binprm *); 126 extern int __must_check remove_arg_zero(struct linux_binprm *); 127 extern int search_binary_handler(struct linux_binprm *); 128 extern int flush_old_exec(struct linux_binprm * bprm); 129 extern void setup_new_exec(struct linux_binprm * bprm); 130 extern void finalize_exec(struct linux_binprm *bprm); 131 extern void would_dump(struct linux_binprm *, struct file *); 132 133 extern int suid_dumpable; 134 135 /* Stack area protections */ 136 #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */ 137 #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */ 138 #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */ 139 140 extern int setup_arg_pages(struct linux_binprm * bprm, 141 unsigned long stack_top, 142 int executable_stack); 143 extern int transfer_args_to_stack(struct linux_binprm *bprm, 144 unsigned long *sp_location); 145 extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm); 146 extern int copy_strings_kernel(int argc, const char *const *argv, 147 struct linux_binprm *bprm); 148 extern void set_binfmt(struct linux_binfmt *new); 149 extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t); 150 151 extern int do_execve(struct filename *, 152 const char __user * const __user *, 153 const char __user * const __user *); 154 extern int do_execveat(int, struct filename *, 155 const char __user * const __user *, 156 const char __user * const __user *, 157 int); 158 int do_execve_file(struct file *file, void *__argv, void *__envp); 159 160 #endif /* _LINUX_BINFMTS_H */ 161