LCOV - code coverage report
Current view: top level - strace - bpf_seccomp_filter.c (source / functions) Hit Total Coverage
Test: strace-4.18.0.129.97bbb Code Coverage Lines: 12 12 100.0 %
Date: 2017-07-31 03:46:08 Functions: 3 3 100.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 4 4 100.0 %

           Branch data     Line data    Source code
       1                 :            : /*
       2                 :            :  * Decoder of seccomp filter programs.
       3                 :            :  *
       4                 :            :  * Copyright (c) 2015-2017 Dmitry V. Levin <ldv@altlinux.org>
       5                 :            :  * All rights reserved.
       6                 :            :  *
       7                 :            :  * Redistribution and use in source and binary forms, with or without
       8                 :            :  * modification, are permitted provided that the following conditions
       9                 :            :  * are met:
      10                 :            :  * 1. Redistributions of source code must retain the above copyright
      11                 :            :  *    notice, this list of conditions and the following disclaimer.
      12                 :            :  * 2. Redistributions in binary form must reproduce the above copyright
      13                 :            :  *    notice, this list of conditions and the following disclaimer in the
      14                 :            :  *    documentation and/or other materials provided with the distribution.
      15                 :            :  * 3. The name of the author may not be used to endorse or promote products
      16                 :            :  *    derived from this software without specific prior written permission.
      17                 :            :  *
      18                 :            :  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
      19                 :            :  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
      20                 :            :  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
      21                 :            :  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
      22                 :            :  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
      23                 :            :  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      24                 :            :  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      25                 :            :  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      26                 :            :  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
      27                 :            :  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      28                 :            :  */
      29                 :            : 
      30                 :            : #include "defs.h"
      31                 :            : 
      32                 :            : #include "bpf_filter.h"
      33                 :            : 
      34                 :            : #include <linux/filter.h>
      35                 :            : #ifdef HAVE_LINUX_SECCOMP_H
      36                 :            : # include <linux/seccomp.h>
      37                 :            : #endif
      38                 :            : #ifndef SECCOMP_RET_ACTION
      39                 :            : # define SECCOMP_RET_ACTION 0x7fff0000U
      40                 :            : #endif
      41                 :            : #include "xlat/seccomp_ret_action.h"
      42                 :            : 
      43                 :            : static bool
      44                 :         14 : print_seccomp_filter_k(const struct bpf_filter_block *const fp)
      45                 :            : {
      46         [ +  + ]:         14 :         if (BPF_CLASS(fp->code) == BPF_RET) {
      47                 :         12 :                 unsigned int action = SECCOMP_RET_ACTION & fp->k;
      48                 :         12 :                 unsigned int data = fp->k & ~action;
      49                 :            : 
      50                 :            :                 printxval(seccomp_ret_action, action, "SECCOMP_RET_???");
      51         [ +  + ]:         12 :                 if (data)
      52                 :          4 :                         tprintf("|%#x", data);
      53                 :            : 
      54                 :            :                 return true;
      55                 :            :         }
      56                 :            : 
      57                 :            :         return false;
      58                 :            : }
      59                 :            : 
      60                 :            : void
      61                 :          2 : print_seccomp_fprog(struct tcb *const tcp, const kernel_ulong_t addr,
      62                 :            :                     const unsigned short len)
      63                 :            : {
      64                 :          2 :         print_bpf_fprog(tcp, addr, len, print_seccomp_filter_k);
      65                 :          2 : }
      66                 :            : 
      67                 :            : void
      68                 :          2 : decode_seccomp_fprog(struct tcb *const tcp, const kernel_ulong_t addr)
      69                 :            : {
      70                 :          2 :         decode_bpf_fprog(tcp, addr, print_seccomp_filter_k);
      71                 :          2 : }

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