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 char buf[BINPRM_BUF_SIZE]; 19 #ifdef CONFIG_MMU 20 struct vm_area_struct *vma; 21 unsigned long vma_pages; 22 #else 23 # define MAX_ARG_PAGES 32 24 struct page *page[MAX_ARG_PAGES]; 25 #endif 26 struct mm_struct *mm; 27 unsigned long p; /* current top of mem */ 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 } __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 /* fd of the binary should be passed to the interpreter */ 72 #define BINPRM_FLAGS_EXECFD_BIT 1 73 #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT) 74 75 /* filename of the binary will be inaccessible after exec */ 76 #define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2 77 #define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT) 78 79 /* Function parameter for binfmt->coredump */ 80 struct coredump_params { 81 const siginfo_t *siginfo; 82 struct pt_regs *regs; 83 struct file *file; 84 unsigned long limit; 85 unsigned long mm_flags; 86 loff_t written; 87 loff_t pos; 88 }; 89 90 /* 91 * This structure defines the functions that are used to load the binary formats that 92 * linux accepts. 93 */ 94 struct linux_binfmt { 95 struct list_head lh; 96 struct module *module; 97 int (*load_binary)(struct linux_binprm *); 98 int (*load_shlib)(struct file *); 99 int (*core_dump)(struct coredump_params *cprm); 100 unsigned long min_coredump; /* minimal dump size */ 101 } __randomize_layout; 102 103 extern void __register_binfmt(struct linux_binfmt *fmt, int insert); 104 105 /* Registration of default binfmt handlers */ 106 static inline void register_binfmt(struct linux_binfmt *fmt) 107 { 108 __register_binfmt(fmt, 0); 109 } 110 /* Same as above, but adds a new binfmt at the top of the list */ 111 static inline void insert_binfmt(struct linux_binfmt *fmt) 112 { 113 __register_binfmt(fmt, 1); 114 } 115 116 extern void unregister_binfmt(struct linux_binfmt *); 117 118 extern int prepare_binprm(struct linux_binprm *); 119 extern int __must_check remove_arg_zero(struct linux_binprm *); 120 extern int search_binary_handler(struct linux_binprm *); 121 extern int flush_old_exec(struct linux_binprm * bprm); 122 extern void setup_new_exec(struct linux_binprm * bprm); 123 extern void finalize_exec(struct linux_binprm *bprm); 124 extern void would_dump(struct linux_binprm *, struct file *); 125 126 extern int suid_dumpable; 127 128 /* Stack area protections */ 129 #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */ 130 #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */ 131 #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */ 132 133 extern int setup_arg_pages(struct linux_binprm * bprm, 134 unsigned long stack_top, 135 int executable_stack); 136 extern int transfer_args_to_stack(struct linux_binprm *bprm, 137 unsigned long *sp_location); 138 extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm); 139 extern int copy_strings_kernel(int argc, const char *const *argv, 140 struct linux_binprm *bprm); 141 extern int prepare_bprm_creds(struct linux_binprm *bprm); 142 extern void install_exec_creds(struct linux_binprm *bprm); 143 extern void set_binfmt(struct linux_binfmt *new); 144 extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t); 145 146 extern int do_execve(struct filename *, 147 const char __user * const __user *, 148 const char __user * const __user *); 149 extern int do_execveat(int, struct filename *, 150 const char __user * const __user *, 151 const char __user * const __user *, 152 int); 153 154 #endif /* _LINUX_BINFMTS_H */ 155