LCOV - code coverage report
Current view: top level - libelf - elf_getphdrnum.c (source / functions) Coverage Total Hit
Test: elfutils-0.193 Lines: 70.0 % 50 35
Test Date: 2025-08-30 14:31:09 Functions: 100.0 % 3 3
Legend: Lines:     hit not hit
Branches: + taken - not taken # not executed
Branches: 60.5 % 38 23

             Branch data     Line data    Source code
       1                 :             : /* Return number of program headers in the ELF file.
       2                 :             :    Copyright (C) 2010, 2014, 2015, 2016 Red Hat, Inc.
       3                 :             :    This file is part of elfutils.
       4                 :             : 
       5                 :             :    This file is free software; you can redistribute it and/or modify
       6                 :             :    it under the terms of either
       7                 :             : 
       8                 :             :      * the GNU Lesser General Public License as published by the Free
       9                 :             :        Software Foundation; either version 3 of the License, or (at
      10                 :             :        your option) any later version
      11                 :             : 
      12                 :             :    or
      13                 :             : 
      14                 :             :      * the GNU General Public License as published by the Free
      15                 :             :        Software Foundation; either version 2 of the License, or (at
      16                 :             :        your option) any later version
      17                 :             : 
      18                 :             :    or both in parallel, as here.
      19                 :             : 
      20                 :             :    elfutils is distributed in the hope that it will be useful, but
      21                 :             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      22                 :             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      23                 :             :    General Public License for more details.
      24                 :             : 
      25                 :             :    You should have received copies of the GNU General Public License and
      26                 :             :    the GNU Lesser General Public License along with this program.  If
      27                 :             :    not, see <http://www.gnu.org/licenses/>.  */
      28                 :             : 
      29                 :             : #ifdef HAVE_CONFIG_H
      30                 :             : # include <config.h>
      31                 :             : #endif
      32                 :             : 
      33                 :             : #include <assert.h>
      34                 :             : #include <gelf.h>
      35                 :             : #include <stddef.h>
      36                 :             : 
      37                 :             : #include "libelfP.h"
      38                 :             : 
      39                 :             : 
      40                 :             : int
      41                 :             : internal_function
      42                 :      171850 : __elf_getphdrnum_rdlock (Elf *elf, size_t *dst)
      43                 :             : {
      44         [ -  + ]:      171850 :  if (unlikely (elf->state.elf64.ehdr == NULL))
      45                 :             :    {
      46                 :             :      /* Maybe no ELF header was created yet.  */
      47                 :           0 :      *dst = 0;
      48                 :           0 :      __libelf_seterrno (ELF_E_WRONG_ORDER_EHDR);
      49                 :           0 :      return -1;
      50                 :             :    }
      51                 :             : 
      52                 :      343700 :  *dst = (elf->class == ELFCLASS32
      53                 :       28392 :          ? elf->state.elf32.ehdr->e_phnum
      54         [ +  + ]:      171850 :          : elf->state.elf64.ehdr->e_phnum);
      55                 :             : 
      56         [ +  + ]:      171850 :  if (*dst == PN_XNUM)
      57                 :             :    {
      58                 :          12 :      const Elf_ScnList *const scns = (elf->class == ELFCLASS32
      59                 :             :                                       ? &elf->state.elf32.scns
      60                 :             :                                       : &elf->state.elf64.scns);
      61                 :             : 
      62                 :             :      /* If there are no section headers, perhaps this is really just 65536
      63                 :             :         written without PN_XNUM support.  Either that or it's bad data.  */
      64                 :             : 
      65         [ -  + ]:          12 :      if (elf->class == ELFCLASS32)
      66                 :             :        {
      67         [ #  # ]:           0 :          if (likely (scns->cnt > 0))
      68                 :             :            {
      69                 :           0 :              Elf_Scn *scn = &elf->state.elf32.scns.data[0];
      70         [ #  # ]:           0 :              Elf32_Shdr *shdr = scn->shdr.e32 ?: __elf32_getshdr_rdlock (scn);
      71         [ #  # ]:           0 :              if (shdr)
      72                 :           0 :                *dst = shdr->sh_info;
      73                 :             :            }
      74                 :             :        }
      75                 :             :      else
      76                 :             :        {
      77         [ -  + ]:          12 :          if (likely (scns->cnt > 0))
      78                 :             :            {
      79                 :          12 :              Elf_Scn *scn = &elf->state.elf64.scns.data[0];
      80         [ +  + ]:          12 :              Elf64_Shdr *shdr = scn->shdr.e64 ?: __elf64_getshdr_rdlock (scn);
      81         [ -  + ]:           2 :              if (shdr)
      82                 :          12 :                *dst = shdr->sh_info;
      83                 :             :            }
      84                 :             :        }
      85                 :             :    }
      86                 :             : 
      87                 :             :  return 0;
      88                 :             : }
      89                 :             : 
      90                 :             : int
      91                 :             : internal_function
      92                 :      154880 : __elf_getphdrnum_chk_rdlock (Elf *elf, size_t *dst)
      93                 :             : {
      94                 :      154880 :   int result = __elf_getphdrnum_rdlock (elf, dst);
      95                 :             : 
      96                 :             :   /* If the phdrs haven't been created or read in yet then do some
      97                 :             :      sanity checking to make sure phnum and phoff are consistent.  */
      98         [ +  + ]:      154880 :   if (elf->state.elf.phdr == NULL)
      99                 :             :     {
     100                 :       32668 :       Elf64_Off off = (elf->class == ELFCLASS32
     101                 :        1938 :                        ? elf->state.elf32.ehdr->e_phoff
     102         [ +  + ]:       16334 :                        : elf->state.elf64.ehdr->e_phoff);
     103         [ +  + ]:       16334 :       if (unlikely (off == 0))
     104                 :             :         {
     105                 :        2462 :           *dst = 0;
     106                 :        2462 :           return result;
     107                 :             :         }
     108                 :             : 
     109         [ -  + ]:       13872 :       if (unlikely (off >= elf->maximum_size))
     110                 :             :         {
     111                 :           0 :           __libelf_seterrno (ELF_E_INVALID_DATA);
     112                 :           0 :           return -1;
     113                 :             :         }
     114                 :             : 
     115                 :             :       /* Check for too many sections.  */
     116                 :       27744 :       size_t phdr_size = (elf->class == ELFCLASS32
     117         [ +  + ]:       13872 :                           ? sizeof (Elf32_Phdr) : sizeof (Elf64_Phdr));
     118         [ -  + ]:       13872 :       if (unlikely (*dst > SIZE_MAX / phdr_size))
     119                 :             :         {
     120                 :           0 :           __libelf_seterrno (ELF_E_INVALID_DATA);
     121                 :           0 :           return -1;
     122                 :             :         }
     123                 :             : 
     124                 :             :       /* Truncated file?  Don't return more than can be indexed.  */
     125         [ +  - ]:       13872 :       if (unlikely (elf->maximum_size - off < *dst * phdr_size))
     126                 :           0 :         *dst = (elf->maximum_size - off) / phdr_size;
     127                 :             :     }
     128                 :             : 
     129                 :             :   return result;
     130                 :             : }
     131                 :             : 
     132                 :             : int
     133                 :       18746 : elf_getphdrnum (Elf *elf, size_t *dst)
     134                 :             : {
     135                 :       18746 :   int result;
     136                 :             : 
     137         [ -  + ]:       18746 :   if (elf == NULL)
     138                 :             :     return -1;
     139                 :             : 
     140         [ -  + ]:       18746 :   if (unlikely (elf->kind != ELF_K_ELF))
     141                 :             :     {
     142                 :           0 :       __libelf_seterrno (ELF_E_INVALID_HANDLE);
     143                 :           0 :       return -1;
     144                 :             :     }
     145                 :             : 
     146                 :       18746 :   rwlock_rdlock (elf->lock);
     147                 :       18746 :   result = __elf_getphdrnum_chk_rdlock (elf, dst);
     148                 :       18746 :   rwlock_unlock (elf->lock);
     149                 :             : 
     150                 :       18746 :   return result;
     151                 :             : }
        

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