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 #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 long argmin; /* rlimit marker for copy_strings() */ 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 #ifdef __alpha__ 47 unsigned int taso:1; 48 #endif 49 struct file *executable; /* Executable to pass to the interpreter */ 50 struct file *interpreter; 51 struct file *file; 52 struct cred *cred; /* new credentials */ 53 int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */ 54 unsigned int per_clear; /* bits to clear in current->personality */ 55 int argc, envc; 56 const char *filename; /* Name of binary as seen by procps */ 57 const char *interp; /* Name of the binary really executed. Most 58 of the time same as filename, but could be 59 different for binfmt_{misc,script} */ 60 const char *fdpath; /* generated filename for execveat */ 61 unsigned interp_flags; 62 int execfd; /* File descriptor of the executable */ 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 /* filename of the binary will be inaccessible after exec */ 74 #define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2 75 #define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT) 76 77 /* preserve argv0 for the interpreter */ 78 #define BINPRM_FLAGS_PRESERVE_ARGV0_BIT 3 79 #define BINPRM_FLAGS_PRESERVE_ARGV0 (1 << BINPRM_FLAGS_PRESERVE_ARGV0_BIT) 80 81 /* 82 * This structure defines the functions that are used to load the binary formats that 83 * linux accepts. 84 */ 85 struct linux_binfmt { 86 struct list_head lh; 87 struct module *module; 88 int (*load_binary)(struct linux_binprm *); 89 int (*load_shlib)(struct file *); 90 #ifdef CONFIG_COREDUMP 91 int (*core_dump)(struct coredump_params *cprm); 92 unsigned long min_coredump; /* minimal dump size */ 93 #endif 94 } __randomize_layout; 95 96 extern void __register_binfmt(struct linux_binfmt *fmt, int insert); 97 98 /* Registration of default binfmt handlers */ 99 static inline void register_binfmt(struct linux_binfmt *fmt) 100 { 101 __register_binfmt(fmt, 0); 102 } 103 /* Same as above, but adds a new binfmt at the top of the list */ 104 static inline void insert_binfmt(struct linux_binfmt *fmt) 105 { 106 __register_binfmt(fmt, 1); 107 } 108 109 extern void unregister_binfmt(struct linux_binfmt *); 110 111 extern int __must_check remove_arg_zero(struct linux_binprm *); 112 extern int begin_new_exec(struct linux_binprm * bprm); 113 extern void setup_new_exec(struct linux_binprm * bprm); 114 extern void finalize_exec(struct linux_binprm *bprm); 115 extern void would_dump(struct linux_binprm *, struct file *); 116 117 extern int suid_dumpable; 118 119 /* Stack area protections */ 120 #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */ 121 #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */ 122 #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */ 123 124 extern int setup_arg_pages(struct linux_binprm * bprm, 125 unsigned long stack_top, 126 int executable_stack); 127 extern int transfer_args_to_stack(struct linux_binprm *bprm, 128 unsigned long *sp_location); 129 extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm); 130 int copy_string_kernel(const char *arg, struct linux_binprm *bprm); 131 extern void set_binfmt(struct linux_binfmt *new); 132 extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t); 133 134 int kernel_execve(const char *filename, 135 const char *const *argv, const char *const *envp); 136 137 #endif /* _LINUX_BINFMTS_H */ 138