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 #ifdef __alpha__ 49 unsigned int taso:1; 50 #endif 51 unsigned int recursion_depth; /* only for search_binary_handler() */ 52 struct file * file; 53 struct cred *cred; /* new credentials */ 54 int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */ 55 unsigned int per_clear; /* bits to clear in current->personality */ 56 int argc, envc; 57 const char * filename; /* Name of binary as seen by procps */ 58 const char * interp; /* Name of the binary really executed. Most 59 of the time same as filename, but could be 60 different for binfmt_{misc,script} */ 61 unsigned interp_flags; 62 unsigned interp_data; 63 unsigned long loader, exec; 64 65 struct rlimit rlim_stack; /* Saved RLIMIT_STACK used during exec. */ 66 67 char buf[BINPRM_BUF_SIZE]; 68 } __randomize_layout; 69 70 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0 71 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT) 72 73 /* fd of the binary should be passed to the interpreter */ 74 #define BINPRM_FLAGS_EXECFD_BIT 1 75 #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT) 76 77 /* filename of the binary will be inaccessible after exec */ 78 #define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2 79 #define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT) 80 81 /* Function parameter for binfmt->coredump */ 82 struct coredump_params { 83 const kernel_siginfo_t *siginfo; 84 struct pt_regs *regs; 85 struct file *file; 86 unsigned long limit; 87 unsigned long mm_flags; 88 loff_t written; 89 loff_t pos; 90 }; 91 92 /* 93 * This structure defines the functions that are used to load the binary formats that 94 * linux accepts. 95 */ 96 struct linux_binfmt { 97 struct list_head lh; 98 struct module *module; 99 int (*load_binary)(struct linux_binprm *); 100 int (*load_shlib)(struct file *); 101 int (*core_dump)(struct coredump_params *cprm); 102 unsigned long min_coredump; /* minimal dump size */ 103 } __randomize_layout; 104 105 extern void __register_binfmt(struct linux_binfmt *fmt, int insert); 106 107 /* Registration of default binfmt handlers */ 108 static inline void register_binfmt(struct linux_binfmt *fmt) 109 { 110 __register_binfmt(fmt, 0); 111 } 112 /* Same as above, but adds a new binfmt at the top of the list */ 113 static inline void insert_binfmt(struct linux_binfmt *fmt) 114 { 115 __register_binfmt(fmt, 1); 116 } 117 118 extern void unregister_binfmt(struct linux_binfmt *); 119 120 extern int prepare_binprm(struct linux_binprm *); 121 extern int __must_check remove_arg_zero(struct linux_binprm *); 122 extern int search_binary_handler(struct linux_binprm *); 123 extern int flush_old_exec(struct linux_binprm * bprm); 124 extern void setup_new_exec(struct linux_binprm * bprm); 125 extern void finalize_exec(struct linux_binprm *bprm); 126 extern void would_dump(struct linux_binprm *, struct file *); 127 128 extern int suid_dumpable; 129 130 /* Stack area protections */ 131 #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */ 132 #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */ 133 #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */ 134 135 extern int setup_arg_pages(struct linux_binprm * bprm, 136 unsigned long stack_top, 137 int executable_stack); 138 extern int transfer_args_to_stack(struct linux_binprm *bprm, 139 unsigned long *sp_location); 140 extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm); 141 extern int copy_strings_kernel(int argc, const char *const *argv, 142 struct linux_binprm *bprm); 143 extern void install_exec_creds(struct linux_binprm *bprm); 144 extern void set_binfmt(struct linux_binfmt *new); 145 extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t); 146 147 extern int do_execve(struct filename *, 148 const char __user * const __user *, 149 const char __user * const __user *); 150 extern int do_execveat(int, struct filename *, 151 const char __user * const __user *, 152 const char __user * const __user *, 153 int); 154 int do_execve_file(struct file *file, void *__argv, void *__envp); 155 156 #endif /* _LINUX_BINFMTS_H */ 157