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 } __randomize_layout; 65 66 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0 67 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT) 68 69 /* fd of the binary should be passed to the interpreter */ 70 #define BINPRM_FLAGS_EXECFD_BIT 1 71 #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_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 /* Function parameter for binfmt->coredump */ 78 struct coredump_params { 79 const siginfo_t *siginfo; 80 struct pt_regs *regs; 81 struct file *file; 82 unsigned long limit; 83 unsigned long mm_flags; 84 loff_t written; 85 loff_t pos; 86 }; 87 88 /* 89 * This structure defines the functions that are used to load the binary formats that 90 * linux accepts. 91 */ 92 struct linux_binfmt { 93 struct list_head lh; 94 struct module *module; 95 int (*load_binary)(struct linux_binprm *); 96 int (*load_shlib)(struct file *); 97 int (*core_dump)(struct coredump_params *cprm); 98 unsigned long min_coredump; /* minimal dump size */ 99 } __randomize_layout; 100 101 extern void __register_binfmt(struct linux_binfmt *fmt, int insert); 102 103 /* Registration of default binfmt handlers */ 104 static inline void register_binfmt(struct linux_binfmt *fmt) 105 { 106 __register_binfmt(fmt, 0); 107 } 108 /* Same as above, but adds a new binfmt at the top of the list */ 109 static inline void insert_binfmt(struct linux_binfmt *fmt) 110 { 111 __register_binfmt(fmt, 1); 112 } 113 114 extern void unregister_binfmt(struct linux_binfmt *); 115 116 extern int prepare_binprm(struct linux_binprm *); 117 extern int __must_check remove_arg_zero(struct linux_binprm *); 118 extern int search_binary_handler(struct linux_binprm *); 119 extern int flush_old_exec(struct linux_binprm * bprm); 120 extern void setup_new_exec(struct linux_binprm * bprm); 121 extern void would_dump(struct linux_binprm *, struct file *); 122 123 extern int suid_dumpable; 124 125 /* Stack area protections */ 126 #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */ 127 #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */ 128 #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */ 129 130 extern int setup_arg_pages(struct linux_binprm * bprm, 131 unsigned long stack_top, 132 int executable_stack); 133 extern int transfer_args_to_stack(struct linux_binprm *bprm, 134 unsigned long *sp_location); 135 extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm); 136 extern int copy_strings_kernel(int argc, const char *const *argv, 137 struct linux_binprm *bprm); 138 extern int prepare_bprm_creds(struct linux_binprm *bprm); 139 extern void install_exec_creds(struct linux_binprm *bprm); 140 extern void set_binfmt(struct linux_binfmt *new); 141 extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t); 142 143 extern int do_execve(struct filename *, 144 const char __user * const __user *, 145 const char __user * const __user *); 146 extern int do_execveat(int, struct filename *, 147 const char __user * const __user *, 148 const char __user * const __user *, 149 int); 150 151 #endif /* _LINUX_BINFMTS_H */ 152