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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/sched.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         char tcomm[TASK_COMM_LEN];
 62 };
 63 
 64 #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
 65 #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
 66 
 67 /* fd of the binary should be passed to the interpreter */
 68 #define BINPRM_FLAGS_EXECFD_BIT 1
 69 #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
 70 
 71 #define BINPRM_MAX_RECURSION 4
 72 
 73 /* Function parameter for binfmt->coredump */
 74 struct coredump_params {
 75         long signr;
 76         struct pt_regs *regs;
 77         struct file *file;
 78         unsigned long limit;
 79         unsigned long mm_flags;
 80 };
 81 
 82 /*
 83  * This structure defines the functions that are used to load the binary formats that
 84  * linux accepts.
 85  */
 86 struct linux_binfmt {
 87         struct list_head lh;
 88         struct module *module;
 89         int (*load_binary)(struct linux_binprm *, struct  pt_regs * regs);
 90         int (*load_shlib)(struct file *);
 91         int (*core_dump)(struct coredump_params *cprm);
 92         unsigned long min_coredump;     /* minimal dump size */
 93 };
 94 
 95 extern void __register_binfmt(struct linux_binfmt *fmt, int insert);
 96 
 97 /* Registration of default binfmt handlers */
 98 static inline void register_binfmt(struct linux_binfmt *fmt)
 99 {
100         __register_binfmt(fmt, 0);
101 }
102 /* Same as above, but adds a new binfmt at the top of the list */
103 static inline void insert_binfmt(struct linux_binfmt *fmt)
104 {
105         __register_binfmt(fmt, 1);
106 }
107 
108 extern void unregister_binfmt(struct linux_binfmt *);
109 
110 extern int prepare_binprm(struct linux_binprm *);
111 extern int __must_check remove_arg_zero(struct linux_binprm *);
112 extern int search_binary_handler(struct linux_binprm *, struct pt_regs *);
113 extern int flush_old_exec(struct linux_binprm * bprm);
114 extern void setup_new_exec(struct linux_binprm * bprm);
115 extern void would_dump(struct linux_binprm *, struct file *);
116 
117 extern int suid_dumpable;
118 #define SUID_DUMP_DISABLE       0       /* No setuid dumping */
119 #define SUID_DUMP_USER          1       /* Dump as user of process */
120 #define SUID_DUMP_ROOT          2       /* Dump as root */
121 
122 /* Stack area protections */
123 #define EXSTACK_DEFAULT   0     /* Whatever the arch defaults to */
124 #define EXSTACK_DISABLE_X 1     /* Disable executable stacks */
125 #define EXSTACK_ENABLE_X  2     /* Enable executable stacks */
126 
127 extern int setup_arg_pages(struct linux_binprm * bprm,
128                            unsigned long stack_top,
129                            int executable_stack);
130 extern int bprm_mm_init(struct linux_binprm *bprm);
131 extern int copy_strings_kernel(int argc, const char *const *argv,
132                                struct linux_binprm *bprm);
133 extern int prepare_bprm_creds(struct linux_binprm *bprm);
134 extern void install_exec_creds(struct linux_binprm *bprm);
135 extern void do_coredump(long signr, int exit_code, struct pt_regs *regs);
136 extern void set_binfmt(struct linux_binfmt *new);
137 extern void free_bprm(struct linux_binprm *);
138 
139 #endif /* __KERNEL__ */
140 #endif /* _LINUX_BINFMTS_H */
141 

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