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 struct coredump_params; 12 13 #define CORENAME_MAX_SIZE 128 14 15 /* 16 * This structure is used to hold the arguments that are used when loading binaries. 17 */ 18 struct linux_binprm { 19 #ifdef CONFIG_MMU 20 struct vm_area_struct *vma; 21 unsigned long vma_pages; 22 unsigned long argmin; /* rlimit marker for copy_strings() */ 23 #else 24 # define MAX_ARG_PAGES 32 25 struct page *page[MAX_ARG_PAGES]; 26 #endif 27 struct mm_struct *mm; 28 unsigned long p; /* current top of mem */ 29 unsigned int 30 /* Should an execfd be passed to userspace? */ 31 have_execfd:1, 32 33 /* Use the creds of a script (see binfmt_misc) */ 34 execfd_creds:1, 35 /* 36 * Set by bprm_creds_for_exec hook to indicate a 37 * privilege-gaining exec has happened. Used to set 38 * AT_SECURE auxv for glibc. 39 */ 40 secureexec:1, 41 /* 42 * Set when errors can no longer be returned to the 43 * original userspace. 44 */ 45 point_of_no_return:1; 46 struct file *executable; /* Executable to pass to the interpreter */ 47 struct file *interpreter; 48 struct file *file; 49 struct cred *cred; /* new credentials */ 50 int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */ 51 unsigned int per_clear; /* bits to clear in current->personality */ 52 int argc, envc; 53 const char *filename; /* Name of binary as seen by procps */ 54 const char *interp; /* Name of the binary really executed. Most 55 of the time same as filename, but could be 56 different for binfmt_{misc,script} */ 57 const char *fdpath; /* generated filename for execveat */ 58 unsigned interp_flags; 59 int execfd; /* File descriptor of the executable */ 60 unsigned long loader, exec; 61 62 struct rlimit rlim_stack; /* Saved RLIMIT_STACK used during exec. */ 63 64 char buf[BINPRM_BUF_SIZE]; 65 } __randomize_layout; 66 67 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0 68 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT) 69 70 /* filename of the binary will be inaccessible after exec */ 71 #define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2 72 #define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT) 73 74 /* preserve argv0 for the interpreter */ 75 #define BINPRM_FLAGS_PRESERVE_ARGV0_BIT 3 76 #define BINPRM_FLAGS_PRESERVE_ARGV0 (1 << BINPRM_FLAGS_PRESERVE_ARGV0_BIT) 77 78 /* 79 * This structure defines the functions that are used to load the binary formats that 80 * linux accepts. 81 */ 82 struct linux_binfmt { 83 struct list_head lh; 84 struct module *module; 85 int (*load_binary)(struct linux_binprm *); 86 int (*load_shlib)(struct file *); 87 #ifdef CONFIG_COREDUMP 88 int (*core_dump)(struct coredump_params *cprm); 89 unsigned long min_coredump; /* minimal dump size */ 90 #endif 91 } __randomize_layout; 92 93 #if IS_ENABLED(CONFIG_BINFMT_MISC) 94 struct binfmt_misc { 95 struct list_head entries; 96 rwlock_t entries_lock; 97 bool enabled; 98 } __randomize_layout; 99 100 extern struct binfmt_misc init_binfmt_misc; 101 #endif 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 __must_check remove_arg_zero(struct linux_binprm *); 119 extern int begin_new_exec(struct linux_binprm * bprm); 120 extern void setup_new_exec(struct linux_binprm * bprm); 121 extern void finalize_exec(struct linux_binprm *bprm); 122 extern void would_dump(struct linux_binprm *, struct file *); 123 124 extern int suid_dumpable; 125 126 /* Stack area protections */ 127 #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */ 128 #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */ 129 #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */ 130 131 extern int setup_arg_pages(struct linux_binprm * bprm, 132 unsigned long stack_top, 133 int executable_stack); 134 extern int transfer_args_to_stack(struct linux_binprm *bprm, 135 unsigned long *sp_location); 136 extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm); 137 int copy_string_kernel(const char *arg, struct linux_binprm *bprm); 138 extern void set_binfmt(struct linux_binfmt *new); 139 extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t); 140 141 int kernel_execve(const char *filename, 142 const char *const *argv, const char *const *envp); 143 144 #endif /* _LINUX_BINFMTS_H */ 145
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