Line data Source code
1 : #ifndef _LINUX_BINFMTS_H
2 : #define _LINUX_BINFMTS_H
3 :
4 : #include <linux/capability.h>
5 :
6 : struct pt_regs;
7 :
8 : /*
9 : * These are the maximum length and maximum number of strings passed to the
10 : * execve() system call. MAX_ARG_STRLEN is essentially random but serves to
11 : * prevent the kernel from being unduly impacted by misaddressed pointers.
12 : * MAX_ARG_STRINGS is chosen to fit in a signed 32-bit integer.
13 : */
14 : #define MAX_ARG_STRLEN (PAGE_SIZE * 32)
15 : #define MAX_ARG_STRINGS 0x7FFFFFFF
16 :
17 : /* sizeof(linux_binprm->buf) */
18 : #define BINPRM_BUF_SIZE 128
19 :
20 : #ifdef __KERNEL__
21 : #include <linux/list.h>
22 :
23 : #define CORENAME_MAX_SIZE 128
24 :
25 : /*
26 : * This structure is used to hold the arguments that are used when loading binaries.
27 : */
28 : struct linux_binprm{
29 : char buf[BINPRM_BUF_SIZE];
30 : #ifdef CONFIG_MMU
31 : struct vm_area_struct *vma;
32 : unsigned long vma_pages;
33 : #else
34 : # define MAX_ARG_PAGES 32
35 : struct page *page[MAX_ARG_PAGES];
36 : #endif
37 : struct mm_struct *mm;
38 : unsigned long p; /* current top of mem */
39 : unsigned int
40 : cred_prepared:1,/* true if creds already prepared (multiple
41 : * preps happen for interpreters) */
42 : cap_effective:1;/* true if has elevated effective capabilities,
43 : * false if not; except for init which inherits
44 : * its parent's caps anyway */
45 : #ifdef __alpha__
46 : unsigned int taso:1;
47 : #endif
48 : unsigned int recursion_depth;
49 : struct file * file;
50 : struct cred *cred; /* new credentials */
51 : int unsafe; /* how unsafe this exec is (mask of LSM_UNSAFE_*) */
52 : unsigned int per_clear; /* bits to clear in current->personality */
53 : int argc, envc;
54 : char * filename; /* Name of binary as seen by procps */
55 : char * interp; /* Name of the binary really executed. Most
56 : of the time same as filename, but could be
57 : different for binfmt_{misc,script} */
58 : unsigned interp_flags;
59 : unsigned interp_data;
60 : unsigned long loader, exec;
61 : };
62 :
63 : extern void acct_arg_size(struct linux_binprm *bprm, unsigned long pages);
64 : extern struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos,
65 1 : int write);
66 :
67 : #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
68 : #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
69 :
70 : /* fd of the binary should be passed to the interpreter */
71 : #define BINPRM_FLAGS_EXECFD_BIT 1
72 : #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
73 :
74 : #define BINPRM_MAX_RECURSION 4
75 :
76 : /* Function parameter for binfmt->coredump */
77 : struct coredump_params {
78 : long signr;
79 : struct pt_regs *regs;
80 : struct file *file;
81 : unsigned long limit;
82 : };
83 1 :
84 : /*
85 : * This structure defines the functions that are used to load the binary formats that
86 : * linux accepts.
87 : */
88 : struct linux_binfmt {
89 : struct list_head lh;
90 : struct module *module;
91 : int (*load_binary)(struct linux_binprm *, struct pt_regs * regs);
92 : int (*load_shlib)(struct file *);
93 : int (*core_dump)(struct coredump_params *cprm);
94 : unsigned long min_coredump; /* minimal dump size */
95 : int hasvdso;
96 : };
97 :
98 : extern int __register_binfmt(struct linux_binfmt *fmt, int insert);
99 :
100 : /* Registration of default binfmt handlers */
101 : static inline int register_binfmt(struct linux_binfmt *fmt)
102 : {
103 : return __register_binfmt(fmt, 0);
104 : }
105 : /* Same as above, but adds a new binfmt at the top of the list */
106 : static inline int insert_binfmt(struct linux_binfmt *fmt)
107 : {
108 : return __register_binfmt(fmt, 1);
109 : }
110 :
111 : extern void unregister_binfmt(struct linux_binfmt *);
112 :
113 : extern int prepare_binprm(struct linux_binprm *);
114 : extern int __must_check remove_arg_zero(struct linux_binprm *);
115 : extern int search_binary_handler(struct linux_binprm *,struct pt_regs *);
116 : extern int flush_old_exec(struct linux_binprm * bprm);
117 : extern void setup_new_exec(struct linux_binprm * bprm);
118 :
119 : extern int suid_dumpable;
120 : #define SUID_DUMP_DISABLE 0 /* No setuid dumping */
121 : #define SUID_DUMP_USER 1 /* Dump as user of process */
122 : #define SUID_DUMP_ROOT 2 /* Dump as root */
123 :
124 : /* Stack area protections */
125 : #define EXSTACK_DEFAULT 0 /* Whatever the arch defaults to */
126 : #define EXSTACK_DISABLE_X 1 /* Disable executable stacks */
127 : #define EXSTACK_ENABLE_X 2 /* Enable executable stacks */
128 :
129 : extern int setup_arg_pages(struct linux_binprm * bprm,
130 : unsigned long stack_top,
131 : int executable_stack);
132 : extern int bprm_mm_init(struct linux_binprm *bprm);
133 : extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm);
134 : extern int prepare_bprm_creds(struct linux_binprm *bprm);
135 : extern void install_exec_creds(struct linux_binprm *bprm);
136 : extern void do_coredump(long signr, int exit_code, struct pt_regs *regs);
137 : extern void set_binfmt(struct linux_binfmt *new);
138 : extern void free_bprm(struct linux_binprm *);
139 :
140 : #endif /* __KERNEL__ */
141 : #endif /* _LINUX_BINFMTS_H */
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