1#ifndef _LINUX_BINFMTS_H
2#define _LINUX_BINFMTS_H
3
4#include <linux/sched.h>
5#include <linux/unistd.h>
6#include <asm/exec.h>
7#include <uapi/linux/binfmts.h>
8
9#define CORENAME_MAX_SIZE 128
10
11/*
12 * This structure is used to hold the arguments that are used when loading binaries.
13 */
14struct linux_binprm {
15	char buf[BINPRM_BUF_SIZE];
16#ifdef CONFIG_MMU
17	struct vm_area_struct *vma;
18	unsigned long vma_pages;
19#else
20# define MAX_ARG_PAGES	32
21	struct page *page[MAX_ARG_PAGES];
22#endif
23	struct mm_struct *mm;
24	unsigned long p; /* current top of mem */
25	unsigned int
26		cred_prepared:1,/* true if creds already prepared (multiple
27				 * preps happen for interpreters) */
28		cap_effective:1;/* true if has elevated effective capabilities,
29				 * false if not; except for init which inherits
30				 * its parent's caps anyway */
31#ifdef __alpha__
32	unsigned int taso:1;
33#endif
34	unsigned int recursion_depth; /* only for search_binary_handler() */
35	struct file * file;
36	struct cred *cred;	/* new credentials */
37	int unsafe;		/* how unsafe this exec is (mask of LSM_UNSAFE_*) */
38	unsigned int per_clear;	/* bits to clear in current->personality */
39	int argc, envc;
40	const char * filename;	/* Name of binary as seen by procps */
41	const char * interp;	/* Name of the binary really executed. Most
42				   of the time same as filename, but could be
43				   different for binfmt_{misc,script} */
44	unsigned interp_flags;
45	unsigned interp_data;
46	unsigned long loader, exec;
47};
48
49#define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
50#define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
51
52/* fd of the binary should be passed to the interpreter */
53#define BINPRM_FLAGS_EXECFD_BIT 1
54#define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
55
56/* filename of the binary will be inaccessible after exec */
57#define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2
58#define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT)
59
60/* Function parameter for binfmt->coredump */
61struct coredump_params {
62	const siginfo_t *siginfo;
63	struct pt_regs *regs;
64	struct file *file;
65	unsigned long limit;
66	unsigned long mm_flags;
67	loff_t written;
68};
69
70/*
71 * This structure defines the functions that are used to load the binary formats that
72 * linux accepts.
73 */
74struct linux_binfmt {
75	struct list_head lh;
76	struct module *module;
77	int (*load_binary)(struct linux_binprm *);
78	int (*load_shlib)(struct file *);
79	int (*core_dump)(struct coredump_params *cprm);
80	unsigned long min_coredump;	/* minimal dump size */
81};
82
83extern void __register_binfmt(struct linux_binfmt *fmt, int insert);
84
85/* Registration of default binfmt handlers */
86static inline void register_binfmt(struct linux_binfmt *fmt)
87{
88	__register_binfmt(fmt, 0);
89}
90/* Same as above, but adds a new binfmt at the top of the list */
91static inline void insert_binfmt(struct linux_binfmt *fmt)
92{
93	__register_binfmt(fmt, 1);
94}
95
96extern void unregister_binfmt(struct linux_binfmt *);
97
98extern int prepare_binprm(struct linux_binprm *);
99extern int __must_check remove_arg_zero(struct linux_binprm *);
100extern int search_binary_handler(struct linux_binprm *);
101extern int flush_old_exec(struct linux_binprm * bprm);
102extern void setup_new_exec(struct linux_binprm * bprm);
103extern void would_dump(struct linux_binprm *, struct file *);
104
105extern int suid_dumpable;
106
107/* Stack area protections */
108#define EXSTACK_DEFAULT   0	/* Whatever the arch defaults to */
109#define EXSTACK_DISABLE_X 1	/* Disable executable stacks */
110#define EXSTACK_ENABLE_X  2	/* Enable executable stacks */
111
112extern int setup_arg_pages(struct linux_binprm * bprm,
113			   unsigned long stack_top,
114			   int executable_stack);
115extern int bprm_change_interp(char *interp, struct linux_binprm *bprm);
116extern int copy_strings_kernel(int argc, const char *const *argv,
117			       struct linux_binprm *bprm);
118extern int prepare_bprm_creds(struct linux_binprm *bprm);
119extern void install_exec_creds(struct linux_binprm *bprm);
120extern void set_binfmt(struct linux_binfmt *new);
121extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t);
122
123#endif /* _LINUX_BINFMTS_H */
124