lib/libc/gen/elf_utils.c

   1 /*
   2  * Copyright (c) 2010 Konstantin Belousov <kib@freebsd.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Neither the name of the author nor the names of any co-contributors
  11  *    may be used to endorse or promote products derived from this software
  12  *    without specific prior written permission.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD: head/lib/libc/gen/elf_utils.c 217154 2011-01-08 17:13:43Z kib $
  27  */
  28
  29 #include <link.h>
  30
  31 int
  32 __elf_phdr_match_addr(struct dl_phdr_info *phdr_info, void *addr)
  33 {
  34         const Elf_Phdr *ph;
  35         int i;
  36
  37         for (i = 0; i < phdr_info->dlpi_phnum; i++) {
  38                 ph = &phdr_info->dlpi_phdr[i];
  39                 if (ph->p_type != PT_LOAD || (ph->p_flags & PF_X) == 0)
  40                         continue;
  41                 if (phdr_info->dlpi_addr + ph->p_vaddr <= (uintptr_t)addr &&
  42                     (uintptr_t)addr + sizeof(addr) < phdr_info->dlpi_addr +
  43                     ph->p_vaddr + ph->p_memsz)
  44                         break;
  45         }
  46         return (i != phdr_info->dlpi_phnum);
  47 }