Line data    Source code

       1             : /* Return program header table entry.
       2             :    Copyright (C) 1998-2010, 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 <gelf.h>
      35             : #include <string.h>
      36             : #include <stdbool.h>
      37             : 
      38             : #include "libelfP.h"
      39             : 
      40             : 
      41             : GElf_Phdr *
      42       44243 : gelf_getphdr (Elf *elf, int ndx, GElf_Phdr *dst)
      43             : {
      44       44243 :   GElf_Phdr *result = NULL;
      45             : 
      46       44243 :   if (elf == NULL)
      47             :     return NULL;
      48             : 
      49       44243 :   if (unlikely (elf->kind != ELF_K_ELF))
      50             :     {
      51           0 :       __libelf_seterrno (ELF_E_INVALID_HANDLE);
      52           0 :       return NULL;
      53             :     }
      54             : 
      55       44243 :   if (dst == NULL)
      56             :     {
      57           0 :       __libelf_seterrno (ELF_E_INVALID_OPERAND);
      58           0 :       return NULL;
      59             :     }
      60             : 
      61             :   rwlock_rdlock (elf->lock);
      62             : 
      63       44243 :   if (elf->class == ELFCLASS32)
      64             :     {
      65             :       /* Copy the elements one-by-one.  */
      66        9374 :       Elf32_Phdr *phdr = elf->state.elf32.phdr;
      67             : 
      68        9374 :       if (phdr == NULL)
      69             :         {
      70             :           rwlock_unlock (elf->lock);
      71         386 :           phdr = INTUSE(elf32_getphdr) (elf);
      72         386 :           if (phdr == NULL)
      73             :             /* The error number is already set.  */
      74           0 :             return NULL;
      75             :           rwlock_rdlock (elf->lock);
      76             :         }
      77             : 
      78             :       /* Test whether the index is ok.  */
      79             :       size_t phnum;
      80        9374 :       if (__elf_getphdrnum_chk_rdlock (elf, &phnum) != 0
      81        9374 :           || (size_t) ndx >= phnum)
      82             :         {
      83           0 :           __libelf_seterrno (ELF_E_INVALID_INDEX);
      84           0 :           goto out;
      85             :         }
      86             : 
      87             :       /* We know the result now.  */
      88        9374 :       result = dst;
      89             : 
      90             :       /* Now correct the pointer to point to the correct element.  */
      91        9374 :       phdr += ndx;
      92             : 
      93             : #define COPY(Name) result->Name = phdr->Name
      94        9374 :       COPY (p_type);
      95        9374 :       COPY (p_offset);
      96        9374 :       COPY (p_vaddr);
      97        9374 :       COPY (p_paddr);
      98        9374 :       COPY (p_filesz);
      99        9374 :       COPY (p_memsz);
     100        9374 :       COPY (p_flags);
     101        9374 :       COPY (p_align);
     102             :     }
     103             :   else
     104             :     {
     105             :       /* Copy the elements one-by-one.  */
     106       34869 :       Elf64_Phdr *phdr = elf->state.elf64.phdr;
     107             : 
     108       34869 :       if (phdr == NULL)
     109             :         {
     110             :           rwlock_unlock (elf->lock);
     111        5690 :           phdr = INTUSE(elf64_getphdr) (elf);
     112        5690 :           if (phdr == NULL)
     113             :             /* The error number is already set.  */
     114           0 :             return NULL;
     115             :           rwlock_rdlock (elf->lock);
     116             :         }
     117             : 
     118             :       /* Test whether the index is ok.  */
     119             :       size_t phnum;
     120       34869 :       if (__elf_getphdrnum_chk_rdlock (elf, &phnum) != 0
     121       34869 :           || (size_t) ndx >= phnum)
     122             :         {
     123           0 :           __libelf_seterrno (ELF_E_INVALID_INDEX);
     124           0 :           goto out;
     125             :         }
     126             : 
     127             :       /* We only have to copy the data.  */
     128       69738 :       result = memcpy (dst, phdr + ndx, sizeof (GElf_Phdr));
     129             :     }
     130             : 
     131             :  out:
     132             :   rwlock_unlock (elf->lock);
     133             : 
     134             :   return result;
     135             : }