LCOV - code coverage report
Current view: top level - libelf - elf32_newphdr.c (source / functions) Hit Total Coverage
Test: elfutils-0.189 Lines: 31 67 46.3 %
Date: 2023-10-03 16:45:27 Functions: 2 2 100.0 %
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: 17 42 40.5 %

           Branch data     Line data    Source code
       1                 :            : /* Create new ELF program header table.
       2                 :            :    Copyright (C) 1999-2010, 2014, 2015 Red Hat, Inc.
       3                 :            :    This file is part of elfutils.
       4                 :            :    Written by Ulrich Drepper <drepper@redhat.com>, 1998.
       5                 :            : 
       6                 :            :    This file is free software; you can redistribute it and/or modify
       7                 :            :    it under the terms of either
       8                 :            : 
       9                 :            :      * the GNU Lesser General Public License as published by the Free
      10                 :            :        Software Foundation; either version 3 of the License, or (at
      11                 :            :        your option) any later version
      12                 :            : 
      13                 :            :    or
      14                 :            : 
      15                 :            :      * the GNU General Public License as published by the Free
      16                 :            :        Software Foundation; either version 2 of the License, or (at
      17                 :            :        your option) any later version
      18                 :            : 
      19                 :            :    or both in parallel, as here.
      20                 :            : 
      21                 :            :    elfutils is distributed in the hope that it will be useful, but
      22                 :            :    WITHOUT ANY WARRANTY; without even the implied warranty of
      23                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      24                 :            :    General Public License for more details.
      25                 :            : 
      26                 :            :    You should have received copies of the GNU General Public License and
      27                 :            :    the GNU Lesser General Public License along with this program.  If
      28                 :            :    not, see <http://www.gnu.org/licenses/>.  */
      29                 :            : 
      30                 :            : #ifdef HAVE_CONFIG_H
      31                 :            : # include <config.h>
      32                 :            : #endif
      33                 :            : 
      34                 :            : #include <assert.h>
      35                 :            : #include <stdlib.h>
      36                 :            : #include <string.h>
      37                 :            : 
      38                 :            : #include "libelfP.h"
      39                 :            : 
      40                 :            : #ifndef LIBELFBITS
      41                 :            : # define LIBELFBITS 32
      42                 :            : #endif
      43                 :            : 
      44                 :            : 
      45                 :            : ElfW2(LIBELFBITS,Phdr) *
      46                 :        802 : elfw2(LIBELFBITS,newphdr) (Elf *elf, size_t count)
      47                 :            : {
      48                 :        802 :   ElfW2(LIBELFBITS,Phdr) *result;
      49                 :            : 
      50         [ -  + ]:        802 :   if (elf == NULL)
      51                 :            :     return NULL;
      52                 :            : 
      53         [ -  + ]:        802 :   if (unlikely (elf->kind != ELF_K_ELF))
      54                 :            :     {
      55                 :          0 :       __libelf_seterrno (ELF_E_INVALID_HANDLE);
      56                 :          0 :       return NULL;
      57                 :            :     }
      58                 :            : 
      59                 :            :   /* This check is correct, it is for sh_info, which is either
      60                 :            :      Elf32_Word or Elf64_Word, both being 32 bits.  But count is size_t
      61                 :            :      so might not fit on 32bit ELF files.  */
      62         [ -  + ]:        802 :   if (unlikely ((ElfW2(LIBELFBITS,Word)) count != count))
      63                 :            :     {
      64                 :          0 :       __libelf_seterrno (ELF_E_INVALID_OPERAND);
      65                 :          0 :       return NULL;
      66                 :            :     }
      67                 :            : 
      68                 :        802 :   rwlock_wrlock (elf->lock);
      69                 :            : 
      70         [ -  + ]:        802 :   if (elf->class == 0)
      71                 :          0 :     elf->class = ELFW(ELFCLASS,LIBELFBITS);
      72         [ -  + ]:        802 :   else if (unlikely (elf->class != ELFW(ELFCLASS,LIBELFBITS)))
      73                 :            :     {
      74                 :          0 :       __libelf_seterrno (ELF_E_INVALID_CLASS);
      75                 :          0 :       result = NULL;
      76                 :          0 :       goto out;
      77                 :            :     }
      78                 :            : 
      79         [ -  + ]:        802 :   if (unlikely (elf->state.ELFW(elf,LIBELFBITS).ehdr == NULL))
      80                 :            :     {
      81                 :          0 :       __libelf_seterrno (ELF_E_WRONG_ORDER_EHDR);
      82                 :          0 :       result = NULL;
      83                 :          0 :       goto out;
      84                 :            :     }
      85                 :            : 
      86                 :            :   /* A COUNT of zero means remove existing table.  */
      87         [ -  + ]:        802 :   if (count == 0)
      88                 :            :     {
      89                 :            :       /* Free the old program header.  */
      90         [ #  # ]:          0 :       if (elf->state.ELFW(elf,LIBELFBITS).phdr != NULL)
      91                 :            :         {
      92         [ #  # ]:          0 :           if (elf->state.ELFW(elf,LIBELFBITS).phdr_flags & ELF_F_MALLOCED)
      93                 :          0 :             free (elf->state.ELFW(elf,LIBELFBITS).phdr);
      94                 :            : 
      95                 :            :           /* Set the pointer to NULL.  */
      96                 :          0 :           elf->state.ELFW(elf,LIBELFBITS).phdr = NULL;
      97                 :            :           /* Set the `e_phnum' member to the new value.  */
      98                 :          0 :           elf->state.ELFW(elf,LIBELFBITS).ehdr->e_phnum = 0;
      99                 :            :           /* Also clear any old PN_XNUM extended value.  */
     100         [ #  # ]:          0 :           if (elf->state.ELFW(elf,LIBELFBITS).scns.cnt > 0)
     101                 :          0 :             elf->state.ELFW(elf,LIBELFBITS).scns.data[0]
     102                 :          0 :               .shdr.ELFW(e,LIBELFBITS)->sh_info = 0;
     103                 :            :           /* Also set the size.  */
     104                 :          0 :           elf->state.ELFW(elf,LIBELFBITS).ehdr->e_phentsize =
     105                 :            :             sizeof (ElfW2(LIBELFBITS,Phdr));
     106                 :            : 
     107                 :          0 :           elf->state.ELFW(elf,LIBELFBITS).phdr_flags |= ELF_F_DIRTY;
     108                 :          0 :           elf->flags |= ELF_F_DIRTY;
     109                 :          0 :           __libelf_seterrno (ELF_E_NOERROR);
     110                 :            :         }
     111                 :            : 
     112                 :            :       result = NULL;
     113                 :            :     }
     114         [ +  + ]:        802 :   else if (elf->state.ELFW(elf,LIBELFBITS).ehdr->e_phnum != count
     115         [ +  - ]:        116 :            || count == PN_XNUM
     116         [ +  + ]:        116 :            || elf->state.ELFW(elf,LIBELFBITS).phdr == NULL)
     117                 :            :     {
     118         [ -  + ]:        776 :       if (unlikely (count > SIZE_MAX / sizeof (ElfW2(LIBELFBITS,Phdr))))
     119                 :            :         {
     120                 :          0 :           __libelf_seterrno (ELF_E_INVALID_INDEX);
     121                 :          0 :           result = NULL;
     122                 :          0 :           goto out;
     123                 :            :         }
     124                 :            : 
     125                 :        776 :       Elf_Scn *scn0 = &elf->state.ELFW(elf,LIBELFBITS).scns.data[0];
     126   [ -  +  -  - ]:        776 :       if (unlikely (count >= PN_XNUM && scn0->shdr.ELFW(e,LIBELFBITS) == NULL))
     127                 :            :         {
     128                 :            :           /* Something is wrong with section zero, but we need it to write
     129                 :            :              the extended phdr count.  */
     130                 :          0 :           __libelf_seterrno (ELF_E_INVALID_SECTION_HEADER);
     131                 :          0 :           result = NULL;
     132                 :          0 :           goto out;
     133                 :            :         }
     134                 :            : 
     135                 :            :       /* Allocate a new program header with the appropriate number of
     136                 :            :          elements.  */
     137                 :        776 :       result = (ElfW2(LIBELFBITS,Phdr) *)
     138                 :        776 :         realloc (elf->state.ELFW(elf,LIBELFBITS).phdr,
     139                 :            :                  count * sizeof (ElfW2(LIBELFBITS,Phdr)));
     140         [ -  + ]:        776 :       if (result == NULL)
     141                 :          0 :         __libelf_seterrno (ELF_E_NOMEM);
     142                 :            :       else
     143                 :            :         {
     144                 :            :           /* Now set the result.  */
     145                 :        776 :           elf->state.ELFW(elf,LIBELFBITS).phdr = result;
     146         [ -  + ]:        776 :           if (count >= PN_XNUM)
     147                 :            :             {
     148                 :            :               /* We have to write COUNT into the zeroth section's sh_info.  */
     149         [ #  # ]:          0 :               if (elf->state.ELFW(elf,LIBELFBITS).scns.cnt == 0)
     150                 :            :                 {
     151         [ #  # ]:          0 :                   assert (elf->state.ELFW(elf,LIBELFBITS).scns.max > 0);
     152                 :          0 :                   elf->state.ELFW(elf,LIBELFBITS).scns.cnt = 1;
     153                 :            :                 }
     154                 :          0 :               scn0->shdr.ELFW(e,LIBELFBITS)->sh_info = count;
     155                 :          0 :               scn0->shdr_flags |= ELF_F_DIRTY;
     156                 :          0 :               elf->state.ELFW(elf,LIBELFBITS).ehdr->e_phnum = PN_XNUM;
     157                 :            :             }
     158                 :            :           else
     159                 :            :             /* Set the `e_phnum' member to the new value.  */
     160                 :        776 :             elf->state.ELFW(elf,LIBELFBITS).ehdr->e_phnum = count;
     161                 :            :           /* Clear the whole memory.  */
     162                 :        776 :           memset (result, '\0', count * sizeof (ElfW2(LIBELFBITS,Phdr)));
     163                 :            :           /* Also set the size.  */
     164                 :        776 :           elf->state.ELFW(elf,LIBELFBITS).ehdr->e_phentsize =
     165                 :        776 :             elf_typesize (LIBELFBITS, ELF_T_PHDR, 1);
     166                 :            :           /* Remember we allocated the array and mark the structure is
     167                 :            :              modified.  */
     168                 :        776 :           elf->state.ELFW(elf,LIBELFBITS).phdr_flags |=
     169                 :            :             ELF_F_DIRTY | ELF_F_MALLOCED;
     170                 :            :           /* We have to rewrite the entire file if the size of the
     171                 :            :              program header is changed.  */
     172                 :        776 :           elf->flags |= ELF_F_DIRTY;
     173                 :            :         }
     174                 :            :     }
     175                 :            :   else
     176                 :            :     {
     177                 :            :       /* We have the same number of entries.  Just clear the array.  */
     178         [ -  + ]:         26 :       assert (elf->state.ELFW(elf,LIBELFBITS).ehdr->e_phentsize
     179                 :            :               == elf_typesize (LIBELFBITS, ELF_T_PHDR, 1));
     180                 :            : 
     181                 :            :       /* Mark the structure as modified.  */
     182                 :         26 :       elf->state.ELFW(elf,LIBELFBITS).phdr_flags |= ELF_F_DIRTY;
     183                 :            : 
     184                 :         26 :       result = elf->state.ELFW(elf,LIBELFBITS).phdr;
     185                 :         26 :       memset (result, '\0', count * sizeof (ElfW2(LIBELFBITS,Phdr)));
     186                 :            :     }
     187                 :            : 
     188                 :            :  out:
     189                 :            :   rwlock_unlock (elf->lock);
     190                 :            : 
     191                 :            :   return result;
     192                 :            : }
     193                 :            : INTDEF(elfw2(LIBELFBITS,newphdr))

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