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/* 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; #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; #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 long argmin; /* rlimit marker for copy_strings() */ unsigned int /* * True after the bprm_set_creds hook has been called once * (multiple calls can be made via prepare_binprm() for * binfmt_script/misc). */ called_set_creds:1, /* * True if most recent call to the commoncaps bprm_set_creds * hook (due to multiple prepare_binprm() calls from the * binfmt_script/misc handlers) resulted in elevated * privileges. */ cap_elevated:1, /* * Set by bprm_set_creds hook to indicate a privilege-gaining * exec has happened. Used to sanitize execution environment * and to set AT_SECURE auxv for glibc. */ secureexec:1, /* * Set by flush_old_exec, when exec_mmap has been called. * This is past the point of no return, when the * exec_update_mutex has been taken. */ called_exec_mmap:1; #ifdef __alpha__ unsigned int taso:1; #endif unsigned int recursion_depth; /* only for search_binary_handler() */ 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} */ unsigned interp_flags; unsigned interp_data; 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) /* fd of the binary should be passed to the interpreter */ #define BINPRM_FLAGS_EXECFD_BIT 1 #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_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) /* Function parameter for binfmt->coredump */ struct coredump_params { const kernel_siginfo_t *siginfo; struct pt_regs *regs; struct file *file; unsigned long limit; unsigned long mm_flags; loff_t written; loff_t pos; }; /* * 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 *); int (*core_dump)(struct coredump_params *cprm); unsigned long min_coredump; /* minimal dump size */ } __randomize_layout; 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 prepare_binprm(struct linux_binprm *); extern int __must_check remove_arg_zero(struct linux_binprm *); extern int search_binary_handler(struct linux_binprm *); extern int flush_old_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); extern int copy_strings_kernel(int argc, const char *const *argv, struct linux_binprm *bprm); extern void install_exec_creds(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); extern int do_execve(struct filename *, const char __user * const __user *, const char __user * const __user *); extern int do_execveat(int, struct filename *, const char __user * const __user *, const char __user * const __user *, int); int do_execve_file(struct file *file, void *__argv, void *__envp); #endif /* _LINUX_BINFMTS_H */
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