LCOV - code coverage report
Current view: top level - include/linux - binfmts.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 3 3 100.0 %
Date: 2017-01-25 Functions: 0 0 -

          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           1 : 
     140             : #endif /* __KERNEL__ */
     141             : #endif /* _LINUX_BINFMTS_H */

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