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TOMOYO Linux Cross Reference
Linux/include/linux/binfmts.h

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  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         const char * filename;  /* Name of binary as seen by procps */
 55         const 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 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
 64 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
 65 
 66 /* fd of the binary should be passed to the interpreter */
 67 #define BINPRM_FLAGS_EXECFD_BIT 1
 68 #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
 69 
 70 /* Function parameter for binfmt->coredump */
 71 struct coredump_params {
 72         long signr;
 73         struct pt_regs *regs;
 74         struct file *file;
 75         unsigned long limit;
 76         unsigned long mm_flags;
 77 };
 78 
 79 /*
 80  * This structure defines the functions that are used to load the binary formats that
 81  * linux accepts.
 82  */
 83 struct linux_binfmt {
 84         struct list_head lh;
 85         struct module *module;
 86         int (*load_binary)(struct linux_binprm *, struct  pt_regs * regs);
 87         int (*load_shlib)(struct file *);
 88         int (*core_dump)(struct coredump_params *cprm);
 89         unsigned long min_coredump;     /* minimal dump size */
 90 };
 91 
 92 extern int __register_binfmt(struct linux_binfmt *fmt, int insert);
 93 
 94 /* Registration of default binfmt handlers */
 95 static inline int register_binfmt(struct linux_binfmt *fmt)
 96 {
 97         return __register_binfmt(fmt, 0);
 98 }
 99 /* Same as above, but adds a new binfmt at the top of the list */
100 static inline int insert_binfmt(struct linux_binfmt *fmt)
101 {
102         return __register_binfmt(fmt, 1);
103 }
104 
105 extern void unregister_binfmt(struct linux_binfmt *);
106 
107 extern int prepare_binprm(struct linux_binprm *);
108 extern int __must_check remove_arg_zero(struct linux_binprm *);
109 extern int search_binary_handler(struct linux_binprm *, struct pt_regs *);
110 extern int flush_old_exec(struct linux_binprm * bprm);
111 extern void setup_new_exec(struct linux_binprm * bprm);
112 extern void would_dump(struct linux_binprm *, struct file *);
113 
114 extern int suid_dumpable;
115 
116 /* Stack area protections */
117 #define EXSTACK_DEFAULT   0     /* Whatever the arch defaults to */
118 #define EXSTACK_DISABLE_X 1     /* Disable executable stacks */
119 #define EXSTACK_ENABLE_X  2     /* Enable executable stacks */
120 
121 extern int setup_arg_pages(struct linux_binprm * bprm,
122                            unsigned long stack_top,
123                            int executable_stack);
124 extern int bprm_mm_init(struct linux_binprm *bprm);
125 extern int bprm_change_interp(char *interp, struct linux_binprm *bprm);
126 extern int copy_strings_kernel(int argc, const char *const *argv,
127                                struct linux_binprm *bprm);
128 extern int prepare_bprm_creds(struct linux_binprm *bprm);
129 extern void install_exec_creds(struct linux_binprm *bprm);
130 extern void do_coredump(long signr, int exit_code, struct pt_regs *regs);
131 extern void set_binfmt(struct linux_binfmt *new);
132 extern void free_bprm(struct linux_binprm *);
133 
134 #endif /* __KERNEL__ */
135 #endif /* _LINUX_BINFMTS_H */
136 

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