diff options
Diffstat (limited to 'include/linux/binfmts.h')
| -rw-r--r-- | include/linux/binfmts.h | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h new file mode 100644 index 000000000..8d51f69f9 --- /dev/null +++ b/include/linux/binfmts.h @@ -0,0 +1,134 @@ +/* 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; +#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 + /* 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; + +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 */ |