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