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 const char *fdpath; /* generated filename for execveat */ 60 unsigned interp_flags; 61 int execfd; /* File descriptor of the executable */ 62 unsigned long loader, exec; 63 64 struct rlimit rlim_stack; /* Saved RLIMIT_STACK used during exec. */ 65 66 char buf[BINPRM_BUF_SIZE]; 67 } __randomize_layout; 68 69 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0 70 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT) 71 72 /* filename of the binary will be inaccessible after exec */ 73 #define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2 74 #define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT) 75 76 /* Function parameter for binfmt->coredump */ 77 struct coredump_params { 78 const kernel_siginfo_t *siginfo; 79 struct pt_regs *regs; 80 struct file *file; 81 unsigned long limit; 82 unsigned long mm_flags; 83 loff_t written; 84 loff_t pos; 85 }; 86 87 /* 88 * This structure defines the functions that are used to load the binary formats that 89 * linux accepts. 90 */ 91 struct linux_binfmt { 92 struct list_head lh; 93 struct module *module; 94 int (*load_binary)(struct linux_binprm *); 95 int (*load_shlib)(struct file *); 96 int (*core_dump)(struct coredump_params *cprm); 97 unsigned long min_coredump; /* minimal dump size */ 98 } __randomize_layout; 99 100 extern void __register_binfmt(struct linux_binfmt *fmt, int insert); 101 102 /* Registration of default binfmt handlers */ 103 static inline void register_binfmt(struct linux_binfmt *fmt) 104 { 105 __register_binfmt(fmt, 0); 106 } 107 /* Same as above, but adds a new binfmt at the top of the list */ 108 static inline void insert_binfmt(struct linux_binfmt *fmt) 109 { 110 __register_binfmt(fmt, 1); 111 } 112 113 extern void unregister_binfmt(struct linux_binfmt *); 114 115 extern int __must_check remove_arg_zero(struct linux_binprm *); 116 extern int begin_new_exec(struct linux_binprm * bprm); 117 extern void setup_new_exec(struct linux_binprm * bprm); 118 extern void finalize_exec(struct linux_binprm *bprm); 119 extern void would_dump(struct linux_binprm *, struct file *); 120 121 extern int suid_dumpable; 122 123 /* Stack area protections */ 124 #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */ 125 #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */ 126 #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */ 127 128 extern int setup_arg_pages(struct linux_binprm * bprm, 129 unsigned long stack_top, 130 int executable_stack); 131 extern int transfer_args_to_stack(struct linux_binprm *bprm, 132 unsigned long *sp_location); 133 extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm); 134 int copy_string_kernel(const char *arg, struct linux_binprm *bprm); 135 extern void set_binfmt(struct linux_binfmt *new); 136 extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t); 137 138 int kernel_execve(const char *filename, 139 const char *const *argv, const char *const *envp); 140 141 #endif /* _LINUX_BINFMTS_H */ 142