/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_BINFMTS_H #define _LINUX_BINFMTS_H #include <linux/sched.h> #include <linux/unistd.h> #include <asm/exec.h> #include <uapi/linux/binfmts.h> struct filename; struct coredump_params; #define CORENAME_MAX_SIZE 128 /* * This structure is used to hold the arguments that are used when loading binaries. */ struct linux_binprm { #ifdef CONFIG_MMU struct vm_area_struct *vma; unsigned long vma_pages; unsigned long argmin; /* rlimit marker for copy_strings() */ #else # define MAX_ARG_PAGES 32 struct page *page[MAX_ARG_PAGES]; #endif struct mm_struct *mm; unsigned long p; /* current top of mem */ unsigned int /* Should an execfd be passed to userspace? */ have_execfd:1, /* Use the creds of a script (see binfmt_misc) */ execfd_creds:1, /* * Set by bprm_creds_for_exec hook to indicate a * privilege-gaining exec has happened. Used to set * AT_SECURE auxv for glibc. */ secureexec:1, /* * Set when errors can no longer be returned to the * original userspace. */ point_of_no_return:1; struct file *executable; /* Executable to pass to the interpreter */ struct file *interpreter; struct file *file; struct cred *cred; /* new credentials */ int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */ unsigned int per_clear; /* bits to clear in current->personality */ int argc, envc; const char *filename; /* Name of binary as seen by procps */ const char *interp; /* Name of the binary really executed. Most of the time same as filename, but could be different for binfmt_{misc,script} */ const char *fdpath; /* generated filename for execveat */ unsigned interp_flags; int execfd; /* File descriptor of the executable */ unsigned long loader, exec; struct rlimit rlim_stack; /* Saved RLIMIT_STACK used during exec. */ char buf[BINPRM_BUF_SIZE]; } __randomize_layout; #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT) /* filename of the binary will be inaccessible after exec */ #define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2 #define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT) /* preserve argv0 for the interpreter */ #define BINPRM_FLAGS_PRESERVE_ARGV0_BIT 3 #define BINPRM_FLAGS_PRESERVE_ARGV0 (1 << BINPRM_FLAGS_PRESERVE_ARGV0_BIT) /* * This structure defines the functions that are used to load the binary formats that * linux accepts. */ struct linux_binfmt { struct list_head lh; struct module *module; int (*load_binary)(struct linux_binprm *); int (*load_shlib)(struct file *); #ifdef CONFIG_COREDUMP int (*core_dump)(struct coredump_params *cprm); unsigned long min_coredump; /* minimal dump size */ #endif } __randomize_layout; #if IS_ENABLED(CONFIG_BINFMT_MISC) struct binfmt_misc { struct list_head entries; rwlock_t entries_lock; bool enabled; } __randomize_layout; extern struct binfmt_misc init_binfmt_misc; #endif extern void __register_binfmt(struct linux_binfmt *fmt, int insert); /* Registration of default binfmt handlers */ static inline void register_binfmt(struct linux_binfmt *fmt) { __register_binfmt(fmt, 0); } /* Same as above, but adds a new binfmt at the top of the list */ static inline void insert_binfmt(struct linux_binfmt *fmt) { __register_binfmt(fmt, 1); } extern void unregister_binfmt(struct linux_binfmt *); extern int __must_check remove_arg_zero(struct linux_binprm *); extern int begin_new_exec(struct linux_binprm * bprm); extern void setup_new_exec(struct linux_binprm * bprm); extern void finalize_exec(struct linux_binprm *bprm); extern void would_dump(struct linux_binprm *, struct file *); extern int suid_dumpable; /* Stack area protections */ #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */ #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */ #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */ extern int setup_arg_pages(struct linux_binprm * bprm, unsigned long stack_top, int executable_stack); extern int transfer_args_to_stack(struct linux_binprm *bprm, unsigned long *sp_location); extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm); int copy_string_kernel(const char *arg, struct linux_binprm *bprm); extern void set_binfmt(struct linux_binfmt *new); extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t); int kernel_execve(const char *filename, const char *const *argv, const char *const *envp); #endif /* _LINUX_BINFMTS_H */