LCOV - code coverage report
Current view: top level - include/linux - binfmts.h (source / functions) Hit Total Coverage
Test: Real Lines: 1 1 100.0 %
Date: 2020-10-17 15:46:16 Functions: 0 0 -
Legend: Neither, QEMU, Real, Both Branches: 0 0 -

           Branch data     Line data    Source code
       1                 :            : /* SPDX-License-Identifier: GPL-2.0 */
       2                 :            : #ifndef _LINUX_BINFMTS_H
       3                 :            : #define _LINUX_BINFMTS_H
       4                 :            : 
       5                 :            : #include <linux/sched.h>
       6                 :            : #include <linux/unistd.h>
       7                 :            : #include <asm/exec.h>
       8                 :            : #include <uapi/linux/binfmts.h>
       9                 :            : 
      10                 :            : struct filename;
      11                 :            : 
      12                 :            : #define CORENAME_MAX_SIZE 128
      13                 :            : 
      14                 :            : /*
      15                 :            :  * This structure is used to hold the arguments that are used when loading binaries.
      16                 :            :  */
      17                 :            : struct linux_binprm {
      18                 :            : #ifdef CONFIG_MMU
      19                 :            :         struct vm_area_struct *vma;
      20                 :            :         unsigned long vma_pages;
      21                 :            : #else
      22                 :            : # define MAX_ARG_PAGES  32
      23                 :            :         struct page *page[MAX_ARG_PAGES];
      24                 :            : #endif
      25                 :            :         struct mm_struct *mm;
      26                 :            :         unsigned long p; /* current top of mem */
      27                 :            :         unsigned long argmin; /* rlimit marker for copy_strings() */
      28                 :            :         unsigned int
      29                 :            :                 /*
      30                 :            :                  * True after the bprm_set_creds hook has been called once
      31                 :            :                  * (multiple calls can be made via prepare_binprm() for
      32                 :            :                  * binfmt_script/misc).
      33                 :            :                  */
      34                 :            :                 called_set_creds:1,
      35                 :            :                 /*
      36                 :            :                  * True if most recent call to the commoncaps bprm_set_creds
      37                 :            :                  * hook (due to multiple prepare_binprm() calls from the
      38                 :            :                  * binfmt_script/misc handlers) resulted in elevated
      39                 :            :                  * privileges.
      40                 :            :                  */
      41                 :            :                 cap_elevated:1,
      42                 :            :                 /*
      43                 :            :                  * Set by bprm_set_creds hook to indicate a privilege-gaining
      44                 :            :                  * exec has happened. Used to sanitize execution environment
      45                 :            :                  * and to set AT_SECURE auxv for glibc.
      46                 :            :                  */
      47                 :            :                 secureexec:1;
      48                 :            : #ifdef __alpha__
      49                 :            :         unsigned int taso:1;
      50                 :            : #endif
      51                 :            :         unsigned int recursion_depth; /* only for search_binary_handler() */
      52                 :            :         struct file * file;
      53                 :            :         struct cred *cred;      /* new credentials */
      54                 :            :         int unsafe;             /* how unsafe this exec is (mask of LSM_UNSAFE_*) */
      55                 :            :         unsigned int per_clear; /* bits to clear in current->personality */
      56                 :            :         int argc, envc;
      57                 :            :         const char * filename;  /* Name of binary as seen by procps */
      58                 :            :         const char * interp;    /* Name of the binary really executed. Most
      59                 :            :                                    of the time same as filename, but could be
      60                 :            :                                    different for binfmt_{misc,script} */
      61                 :            :         unsigned interp_flags;
      62                 :            :         unsigned interp_data;
      63                 :            :         unsigned long loader, exec;
      64                 :            : 
      65                 :            :         struct rlimit rlim_stack; /* Saved RLIMIT_STACK used during exec. */
      66                 :            : 
      67                 :            :         char buf[BINPRM_BUF_SIZE];
      68                 :            : } __randomize_layout;
      69                 :            : 
      70                 :            : #define BINPRM_FLAGS_ENFORCE_NONDUMP_BIT 0
      71                 :            : #define BINPRM_FLAGS_ENFORCE_NONDUMP (1 << BINPRM_FLAGS_ENFORCE_NONDUMP_BIT)
      72                 :            : 
      73                 :            : /* fd of the binary should be passed to the interpreter */
      74                 :            : #define BINPRM_FLAGS_EXECFD_BIT 1
      75                 :            : #define BINPRM_FLAGS_EXECFD (1 << BINPRM_FLAGS_EXECFD_BIT)
      76                 :            : 
      77                 :            : /* filename of the binary will be inaccessible after exec */
      78                 :            : #define BINPRM_FLAGS_PATH_INACCESSIBLE_BIT 2
      79                 :            : #define BINPRM_FLAGS_PATH_INACCESSIBLE (1 << BINPRM_FLAGS_PATH_INACCESSIBLE_BIT)
      80                 :            : 
      81                 :            : /* Function parameter for binfmt->coredump */
      82                 :            : struct coredump_params {
      83                 :            :         const kernel_siginfo_t *siginfo;
      84                 :            :         struct pt_regs *regs;
      85                 :            :         struct file *file;
      86                 :            :         unsigned long limit;
      87                 :            :         unsigned long mm_flags;
      88                 :            :         loff_t written;
      89                 :            :         loff_t pos;
      90                 :            : };
      91                 :            : 
      92                 :            : /*
      93                 :            :  * This structure defines the functions that are used to load the binary formats that
      94                 :            :  * linux accepts.
      95                 :            :  */
      96                 :            : struct linux_binfmt {
      97                 :            :         struct list_head lh;
      98                 :            :         struct module *module;
      99                 :            :         int (*load_binary)(struct linux_binprm *);
     100                 :            :         int (*load_shlib)(struct file *);
     101                 :            :         int (*core_dump)(struct coredump_params *cprm);
     102                 :            :         unsigned long min_coredump;     /* minimal dump size */
     103                 :            : } __randomize_layout;
     104                 :            : 
     105                 :            : extern void __register_binfmt(struct linux_binfmt *fmt, int insert);
     106                 :            : 
     107                 :            : /* Registration of default binfmt handlers */
     108                 :            : static inline void register_binfmt(struct linux_binfmt *fmt)
     109                 :            : {
     110                 :          3 :         __register_binfmt(fmt, 0);
     111                 :            : }
     112                 :            : /* Same as above, but adds a new binfmt at the top of the list */
     113                 :            : static inline void insert_binfmt(struct linux_binfmt *fmt)
     114                 :            : {
     115                 :            :         __register_binfmt(fmt, 1);
     116                 :            : }
     117                 :            : 
     118                 :            : extern void unregister_binfmt(struct linux_binfmt *);
     119                 :            : 
     120                 :            : extern int prepare_binprm(struct linux_binprm *);
     121                 :            : extern int __must_check remove_arg_zero(struct linux_binprm *);
     122                 :            : extern int search_binary_handler(struct linux_binprm *);
     123                 :            : extern int flush_old_exec(struct linux_binprm * bprm);
     124                 :            : extern void setup_new_exec(struct linux_binprm * bprm);
     125                 :            : extern void finalize_exec(struct linux_binprm *bprm);
     126                 :            : extern void would_dump(struct linux_binprm *, struct file *);
     127                 :            : 
     128                 :            : extern int suid_dumpable;
     129                 :            : 
     130                 :            : /* Stack area protections */
     131                 :            : #define EXSTACK_DEFAULT   0     /* Whatever the arch defaults to */
     132                 :            : #define EXSTACK_DISABLE_X 1     /* Disable executable stacks */
     133                 :            : #define EXSTACK_ENABLE_X  2     /* Enable executable stacks */
     134                 :            : 
     135                 :            : extern int setup_arg_pages(struct linux_binprm * bprm,
     136                 :            :                            unsigned long stack_top,
     137                 :            :                            int executable_stack);
     138                 :            : extern int transfer_args_to_stack(struct linux_binprm *bprm,
     139                 :            :                                   unsigned long *sp_location);
     140                 :            : extern int bprm_change_interp(const char *interp, struct linux_binprm *bprm);
     141                 :            : extern int copy_strings_kernel(int argc, const char *const *argv,
     142                 :            :                                struct linux_binprm *bprm);
     143                 :            : extern void install_exec_creds(struct linux_binprm *bprm);
     144                 :            : extern void set_binfmt(struct linux_binfmt *new);
     145                 :            : extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t);
     146                 :            : 
     147                 :            : extern int do_execve(struct filename *,
     148                 :            :                      const char __user * const __user *,
     149                 :            :                      const char __user * const __user *);
     150                 :            : extern int do_execveat(int, struct filename *,
     151                 :            :                        const char __user * const __user *,
     152                 :            :                        const char __user * const __user *,
     153                 :            :                        int);
     154                 :            : int do_execve_file(struct file *file, void *__argv, void *__envp);
     155                 :            : 
     156                 :            : #endif /* _LINUX_BINFMTS_H */
    

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